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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
Form 11-K
     
(Mark One)    
þ
  ANNUAL REPORT PURSUANT TO SECTION 15 (d) OF THE
SECURITIES EXCHANGE ACT OF 1934 (NO FEE REQUIRED)
 
   
For the fiscal year ended December 31, 2005
 
   
OR
 
   
o
  TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE
SECURITIES EXCHANGE ACT OF 1934 (NO FEE REQUIRED)
 
   
For the transition period from                              to                             
Commission file number 1-7819
ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
(Full title of the plan and the address of the plan, if different from that of the issuer named below)
ANALOG DEVICES, INC.
(Name of issuer of the securities held pursuant to the plan and the address of its principal executive office)
One Technology Way
Norwood, Massachusetts 02062-9106
 
 

 


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THE INVESTMENT PARTNERSHIP PLAN
STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS
STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
NOTES TO FINANCIAL STATEMENTS
EIN NO: 04-2348234 PLAN NO: 003
SIGNATURES
Ex-23.1 Consent of Ernst & Young LLP


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ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
Financial Statements
     
-
  Audited Statements of Net Assets Available for Benefits as of December 31, 2005 and 2004.
 
   
-
  Audited Statements of Changes in Net Assets Available for Benefits for the Years Ended December 31, 2005 and 2004.
Supplemental Schedule
     
-
  Schedule H-Line 4i — Schedule of Assets (Held at End of Year).
Exhibits
     
-
  Consent of Independent Registered Public Accounting Firm, filed herewith.

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Independent Registered Public Accounting Firm
The Administration Committee and Participants
Analog Devices, Inc.
The Investment Partnership Plan
We have audited the accompanying statements of net assets available for benefits of the Analog Devices, Inc. The Investment Partnership Plan as of December 31, 2005 and 2004, and the related statements of changes in net assets available for benefits for the years then ended. These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on these financial statements based on our audits.
We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. We were not engaged to perform an audit of the Plan’s internal control over financial reporting. Our audit included consideration of internal control over financial reporting as a basis for designing audit procedures that are appropriate in the circumstances, but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion. An audit also includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.
In our opinion, the financial statements referred to above present fairly, in all material respects, the net assets available for benefits of the Plan at December 31, 2005 and 2004, and the changes in its net assets available for benefits for the years then ended, in conformity with U.S. generally accepted accounting principles.
Our audits were performed for the purpose of forming an opinion on the financial statements taken as a whole. The accompanying supplemental schedule of assets (held at end of year) as of December 31, 2005, is presented for purposes of additional analysis and is not a required part of the financial statements but is supplementary information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. This supplemental schedule is the responsibility of the Plan’s management. The supplemental schedule has been subjected to the auditing procedures applied in our audits of the financial statements and, in our opinion, is fairly stated in all material respects in relation to the financial statements taken as a whole.
(-s- Ernst & Young LLP)
Boston, Massachusetts
April 17, 2006

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ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS
December 31, 2005 and 2004
                 
    2005     2004  
ASSETS
               
 
               
Investments, at fair value
  $ 723,158,359     $ 676,623,749  
 
               
Accrued interest and dividends
    1,013,306       1,049,180  
 
               
Employer contributions receivable
    753,005       732,418  
 
               
Employee contributions receivable
    632,692       516,530  
 
               
Participant loans receivable
    9,286,846       9,114,116  
 
           
Total assets
    734,844,208       688,035,993  
 
           
 
               
LIABILITIES
               
 
               
Payables — Pending investment transactions
    (645,515 )     (1,154,767 )
 
           
 
               
Net assets available for benefits
  $ 734,198,693     $ 686,881,226  
 
           
See accompanying notes.

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ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS
Years ended December 31, 2005 and 2004
                 
    2005     2004  
Investment income (loss):
               
Interest income
  $ 482,066     $ 395,510  
Net appreciation (depreciation) in fair value of investments
    8,301,457       (14,835,219 )
Dividend income and capital gains distributions
    22,076,189       10,679,270  
 
           
 
               
Net investment income (loss)
    30,859,712       (3,760,439 )
 
               
Contributions:
               
Employer
    22,313,378       22,255,646  
Employee
    28,748,324       27,936,090  
 
           
 
               
Total contributions
    51,061,702       50,191,736  
Participant withdrawals
    (34,603,947 )     (23,409,193 )
 
           
 
               
Net increase in net assets available for benefits
    47,317,467       23,022,104  
 
               
Net assets available for benefits at beginning of year
    686,881,226       663,859,122  
 
           
 
               
Net assets available for benefits at end of year
  $ 734,198,693     $ 686,881,226  
 
           
See accompanying notes.

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ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
NOTES TO FINANCIAL STATEMENTS
Years ended December 31, 2005 and 2004
A.    Description of Plan
 
    The following description of the Analog Devices, Inc. (the “Company”) The Investment Partnership Plan (the “Plan”) provides only general information. Participants should refer to the Plan agreement for a more complete description of the Plan’s provisions.
 
    1.      General. The Plan is a contributory defined contribution plan sponsored and administered by the Company. It is subject to the provisions of the Employee Retirement Income Security Act of 1974 (“ERISA”).
 
    2.      Eligibility. Domestic employees of the Company are eligible to participate in the Plan on the first day of employment. The Company contributions are effective on the first day following one year of service. For eligibility purposes, a year of service is a 12-month period during which an employee completes at least 1,000 hours of service.
 
    3.      Contributions. Basic contributions will be made at the sole discretion of the Company. For 2005 and 2004, the Company decided to make the annual basic contribution at 5% of each participant’s total eligible compensation. The Internal Revenue Service defined total eligible compensation as an amount not to exceed $210,000 for 2005 and $205,000 for 2004. For 2006, this amount will increase to $220,000. The Company matches each participant’s pre-tax contribution, if any, by contributing an amount not to exceed 3% (for all participants, except those eligible to participate in the Deferred Compensation Plan) of such participant’s total eligible compensation. A participant may voluntarily contribute to the Plan up to 50% of his or her pre-tax total eligible compensation; however, pre-tax contributions could not exceed $14,000 in 2005 and $13,000 in 2004. This amount will increase to $15,000 for 2006.
 
    Company contributions, participants’ pre-tax contributions and the net investment income related to all contributions are excluded from the participants’ income for federal income tax purposes until such amounts are withdrawn or distributed.

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ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
NOTES TO FINANCIAL STATEMENTS
Years ended December 31, 2005 and 2004
        4.      Investment Options. The investment options of the Plan are listed below.
Analog Devices, Inc. Common Stock Fund
Calamos Growth Fund
Fidelity Diversified International Fund
Fidelity Equity Income Fund
Fidelity Growth Company Fund
Fidelity Growth & Income Portfolio
Fidelity Low-Priced Stock Fund
Fidelity Freedom Income Fund
Fidelity Freedom 2000 Fund
Fidelity Freedom 2005 Fund
Fidelity Freedom 2010 Fund
Fidelity Freedom 2015 Fund
Fidelity Freedom 2020 Fund
Fidelity Freedom 2025 Fund
Fidelity Freedom 2030 Fund
Fidelity Freedom 2035 Fund
Fidelity Freedom 2040 Fund
Fidelity Magellan Fund
Fidelity U.S. Bond Index Fund
Fidelity U.S. Equity Index Commingled Pool
Fidelity Income Fund
Hotchkis and Wiley Mid-Cap Value Fund
Templeton Foreign Fund I
Spartan International Index Fund
Royce Low-Priced Stock Fund
Vanguard Mid-Cap Index Fund
Vanguard Short-Term Bond Index Fund
Vanguard Small-Cap Index Fund
        Additionally, participants have the option to invest vested assets in Fidelity and non-Fidelity funds, which are not offered in the Plan, through a self-directed brokerage service that allows participants access to a wide variety of stocks, bonds, short-term securities and mutual funds.
 
    5.      Vesting. Employee contributions are immediately 100% vested and nonforfeitable at the time they are deducted from the participants’ compensation. Investment income on employee contributions vests as earned. Effective January 1, 2002, company match contributions made thereon and investment earnings thereon become 100% vested after three years of service. Company contributions (both basic and pre-2002 match) and investment earnings thereon become fully vested upon the first to occur of (i) completion of five years of service with the Company, (ii) after reaching age 65 or (iii) upon death or permanent disability while employed by the Company.

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ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
NOTES TO FINANCIAL STATEMENTS
Years ended December 31, 2005 and 2004
        6.      Benefits. Upon normal retirement at age 65, death, permanent disability or termination of employment, the participant’s vested benefits are paid to the participant or his or her beneficiary, at the election of the participant, either in a lump sum or in monthly installments over a period of up to ten years. A participant may elect to defer payment of his or her account until he or she attains age 70 1/2. However, if a participant’s vested benefits are less than $5,000 for 2004 and 2003, upon termination of employment, distribution will be made in the form of a lump-sum payment within one year following termination of employment. Effective March 28, 2005, the $5,000 has been reduced to $1,000. Participants may request an in-service withdrawal for any reason after he or she attains age 59 1/2.
 
    7.      Loans. Participants may borrow the lesser of 50% of their vested account balance or $50,000, as defined by the Plan. Participants repay loans plus interest to their accounts through payroll deductions, generally over a five-year period unless for the purchase of a primary residence, in which case the repayment period may be extended up to a maximum of twenty years. The interest rate on loans, which is announced quarterly, is tied to the interest rate of Treasury Bonds with 3- and 10-year maturities. Once determined, the interest rate is fixed for the duration of the loan.
 
    8.      Accounting. A separate account is maintained for each participant. Account balances are adjusted periodically for employee and Company contributions, withdrawals and a pro rata share of net investment income (loss). Forfeitures that arise when participants terminate employment with the Company prior to vesting are used to offset future Company contributions and administrative expenses of the Plan. If an employee who had terminated after December 31, 1984 returns to the employment of the Company within five years, any amount that had been forfeited will be reinstated by the Company.
 
    All transactions of the Plan (including contributions, withdrawals and exchanges) have been accounted for and reported using units as well as dollars. Net investment income (loss) in each fund is allocated based on the shares or units in each participant’s account, except for the Self-Directed Brokerage Service, whereby earnings are recorded on a transaction specific basis.
 
    9.      Investment allocation. The vested and nonvested share of a participant’s account balance is invested in one or more of the funds depending upon the allocation instructions of the participant. In the absence of such allocation instructions, all amounts accruing to the participant are invested in the Fidelity Income Fund.
 
    10.      Continuation of the Plan. While the Company has not expressed any intent to terminate the Plan or suspend contributions, it is free to do so at any time. In the event of such termination or suspension, each participant would have a nonforfeitable right to all monies in his or her account.

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ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
NOTES TO FINANCIAL STATEMENTS
Years ended December 31, 2005 and 2004
B.   Summary of Significant Accounting Policies
 
    1.      Basis of presentation. The accompanying financial statements have been prepared on the accrual basis of accounting.
 
    2.      Investments. Investments are reported at fair value, based on quoted market prices. Participant loans are reported at their outstanding carrying balance, which approximates fair value.
 
    3.      Contributions. Contributions from employees are recorded when the Company makes payroll deductions from plan participants. Company contributions are accrued at the end of the period in which they become obligations of the Company based upon the terms of the Plan.
 
    4.      Investment income (loss). Net investment income (loss) consists of interest income, dividends and capital gain/loss distributions from the money market and mutual funds, realized gains or losses on sales of investments and the change in net unrealized appreciation (depreciation) between the cost and market value of investments at the beginning and end of the period.
 
    All interest, dividends and capital gains distributions are reinvested in the respective funds and are recorded as earned on an accrual basis.
 
    5.      Income tax status. The Plan has received a determination letter from the Internal Revenue Service, dated May 1, 2003, stating that the Plan is qualified under Section 401(a) of the Internal Revenue Code (the “Code”) and, therefore, the related trust is exempt from taxation. Subsequent to this determination by the Internal Revenue Service, the Plan was amended. Once qualified, the Plan is required to operate in conformity with the Code to maintain its qualification. The Plan Committee believes the Plan is being operated in compliance with the applicable requirements of the Code and, therefore, that the Plan, as amended, is qualified and the related trust is tax exempt.
 
    6.      Related Party. Certain Plan investments are shares of mutual funds managed by FMR Corp. FMR Corp. is a related party to the trustee and recordkeeper of the Plan, and therefore, these transactions qualify as party-in-interest. Fees paid by the Company to the trustee and recordkeeper for administrative expenses amounted to $37,465 and $41,713 for the years ended December 31, 2005 and 2004, respectively.
 
    The Plan also offers the Analog Devices, Inc. Common Stock Fund investment option. The Analog Devices, Inc. Common Stock Fund is designed for investment in the common stock of the Company. In addition, some of the investments in the Plan hold the Company’s Common stock. These transactions qualify as party-in-interest transactions.
 
    Loans to participants also qualify as party-in-interest transactions.

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ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
NOTES TO FINANCIAL STATEMENTS
Years ended December 31, 2005 and 2004
    7.      Administrative expenses. For the years ended December 31, 2005 and 2004, the Company elected to pay the administrative expenses of the Plan.
 
    8.      Use of estimates. The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates that affect the reported amounts of assets and liabilities at the date of the financial statements and the reported amounts of changes in net assets available for benefits during the reporting period. Actual results could differ from those estimates.
 
    9.      Risk and uncertainties. The Plan and its participants invest in various securities. Investment securities are exposed to various risks such as interest rate, market and credit risks. Due to the level of risk associated with certain investment securities, it is at least reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect participants’ account balances and the amounts reported in the statements of net assets available for benefits.
 
C   Trustee and Plan Recordkeeper
 
    Fidelity Management Trust Company and Fidelity Institutional Retirement Services Company serve as trustee and recordkeeper, respectively, to the Plan.

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ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
NOTES TO FINANCIAL STATEMENTS
Years ended December 31, 2005 and 2004
D   Investments
 
    The following investments represent five percent or more of the Plan’s net assets:
                 
    December 31,  
    2005     2004  
Analog Devices, Inc. Common Stock Fund
  $ 147,848,532     $ 170,487,267  
 
               
Fidelity Income Fund
    135,205,496       132,375,094  
 
               
Fidelity Equity Income Fund
    49,788,467       47,161,446  
 
               
Fidelity Growth Company Fund
    46,925,654       46,399,620  
 
               
Fidelity Low-Priced Stock Fund
    46,016,158       43,961,017  
 
               
Fidelity Magellan Fund
    41,550,184       50,642,869  
        The Plan’s investments (including gains and losses on investments bought and sold, as well as held during the year) appreciated (depreciated) in value as follows:
                 
    Year Ended  
    December 31,  
    2005     2004  
Common stock
  $ (3,987,255 )   $ (39,631,868 )
Mutual funds
    12,313,619       24,651,280  
Bonds
    (4,490 )     (3,769 )
Others
    (20,417 )     149,138  
 
           
Net appreciation (depreciation) in fair value of investments
  $ 8,301,457     $ (14,835,219 )
 
           

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ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
SUPPLEMENTAL SCHEDULE
DECEMBER 31, 2005

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ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
EIN NO: 04-2348234 PLAN NO: 003
SCHEDULE H-LINE 4i — SCHEDULE OF ASSETS (HELD AT END OF YEAR)
December 31, 2005
                 
            Current  
    Shares     Value  
Description of Investment:
               
Fidelity(1) Income Fund
    135,205,496     $ 135,205,496  
Fidelity(1) Diversified International Fund
    385,682       12,550,100  
Fidelity(1) Equity Income Fund
    943,321       49,788,467  
Fidelity(1) Freedom Income Fund
    233,470       2,654,551  
Fidelity(1) Freedom 2000 Fund
    143,716       1,754,772  
Fidelity(1) Freedom 2005 Fund
    14,001       155,692  
Fidelity(1) Freedom 2010 Fund
    768,410       10,796,158  
Fidelity(1) Freedom 2015 Fund
    130,150       1,503,230  
Fidelity(1) Freedom 2020 Fund
    762,891       11,222,124  
Fidelity(1) Freedom 2025 Fund
    174,105       2,082,296  
Fidelity(1) Freedom 2030 Fund
    886,599       13,316,714  
Fidelity(1) Freedom 2035 Fund
    47,410       579,827  
Fidelity(1) Freedom 2040 Fund
    349,398       3,085,180  
Fidelity(1) Growth Company Fund
    737,477       46,925,654  
Fidelity(1) Growth & Income Portfolio
    519,906       17,884,756  
Fidelity(1) Low-Priced Stock Fund
    1,126,742       46,016,158  
Fidelity(1) Magellan Fund
    390,363       41,550,184  
Fidelity(1) U.S. Bond Index Fund
    2,195,184       23,927,503  
Fidelity(1) U.S. Equity Index Commingled Pool
    505,520       19,836,610  
Calamos Growth Fund
    138,365       7,618,371  
Hotchkis and Wiley Mid-Cap Value Fund
    731,072       20,616,223  
Royce Low-Priced Stock Fund
    265,373       4,121,243  
Templeton Foreign Fund I
    1,465,379       18,581,005  
Spartan International Index Fund
    111,791       3,994,289  
Vanguard Mid-Cap Index Fund
    481,075       8,481,350  
Vanguard Short-Term Bond Index Fund
    166,037       1,647,089  
Vanguard Small-Cap Index Fund
    130,834       3,731,393  
Participants Self-Directed Brokerage Accounts
            65,683,392  
 
             
 
            575,309,827  
 
             
Analog Devices, Inc. Common Stock Fund:
               
Analog Devices Inc. Common Stock(1)
    3,901,776       139,956,705  
Fidelity(1) Institutional Cash Portfolio — Money Market Portfolio
            7,891,827  
 
             
 
            147,848,532  
 
             
 
          $ 723,158,359  
 
             
Participant Loans Receivable (1)(2)
          $ 9,286,846  
 
             
 
(1)   Indicates party-in-interest to the Plan.
 
(2)   The loan account at December 31, 2005 bears interest at rates ranging from 3.5% to 10.75%, with terms ranging from less than 1 year to 20 years.

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SIGNATURES
     Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed by the undersigned hereunto duly authorized.
         
  ANALOG DEVICES, INC.
THE INVESTMENT PARTNERSHIP PLAN
                           (the Plan)
 
 
  By:   /s/ Joseph E. McDonough    
    Joseph E. McDonough   
    Vice President-Finance and Chief Financial Officer of Analog Devices, Inc. and Member of The Investment Partnership Plan Administration Committee   
 
June 27, 2006

14

exv23w1
 

Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in the Registration Statements (Form S-8 Nos. 33-2502, 2-95495, 33-43128, and 333-08493) pertaining to the Analog Devices, Inc. The Investment Partnership Plan of our report, dated April 17, 2006, with respect to the financial statements and schedule of the Analog Devices Inc. The Investment Partnership Plan included in this Annual Report (Form 11-K) for the year ended December 31, 2005.
(-s- Ernst & Young LLP)
Boston, Massachusetts
June 26, 2006