CDB44L11 Evaluation Board for the CS44L11 Features As shown below, the CS44L11 takes PCM digital audio input and converts it to a PWM output. This 16-pin TSSOP IC provides volume up/down, treble boost, bass boost and mute functions via push buttons and a micro controller using an I²C interface. A RS232 interface is provided for programming the micro controller. 23 mW/Channel into 16 Ω at 2.4 V Variable power supplies from 1.8 V to 2.4 V Digital bass boost and treble boost Programmable digital volume control Short circuit protection >90% amplifier efficiency The CS8420 is a receiver and sample rate converter. It takes in the S/PDIF at a range of input sample rates and generates a PCM output signal at a fixed sample rate. Description The CDB44L11 is an excellent means to quickly demonstrate the CS44L11 Cirrus Digital Power Headphone Amplifier IC. Analysis requires only a digital signal source and an analog signal analyzer. The low pass filter removes high frequency components from the output PWM signal effectively converting it from digital to analog. ORDERING INFORMATION CDB44L11 Demonstration Board I MCLK Clock Divider 16 Ω Headphones LRCK and SCLK S/PDIF IN Low Pass Filter I2S CS8420 CS44L11 4 Low Pass Filter 2 Control Buttons I2C 8 2 uC 5 http://www.cirrus.com LED Indicators Copyright © Cirrus Logic, Inc. 2004 (All Rights Reserved) APR ‘04 DS640DB1 1 CDB44L11 TABLE OF CONTENTS 1. CDB44L11 SYSTEM OVERVIEW ............................................................................................ 3 2. SCHEMATIC DESCRIPTIONS ................................................................................................. 3 2.1 CS44L11 Headphone Monitor and Output Filter ................................................................ 3 2.2 Clocking ............................................................................................................................. 4 2.3 CS8420 Sample Rate Converter ....................................................................................... 4 2.4 Microcontroller ................................................................................................................... 4 2.5 Power Supplies and Level-Shifting .................................................................................... 4 3. OPERATION INFORMATION ................................................................................................... 6 3.1 Operating Instructions ........................................................................................................ 6 4. CONTROL FUNCTIONS ........................................................................................................... 7 4.1 Control Buttons .................................................................................................................. 7 4.2 LED Status ......................................................................................................................... 7 4.3 CS44L11 Initialization ........................................................................................................ 9 5. BILL OF MATERIALS ........................................................................................................... 17 6. REVISION HISTORY .............................................................................................................. 20 LIST OF FIGURES Figure 1. CS44L11 PWM Headphone Amplifier ............................................................................ 10 Figure 2. CS8420 S/PDIF Receiver and Sample Rate Converter................................................. 11 Figure 3. Microcontroller................................................................................................................ 12 Figure 4. Power Supply ................................................................................................................. 13 Figure 5. Assembly Drawing ......................................................................................................... 14 Figure 6. Top Layer ....................................................................................................................... 15 Figure 7. Bottom Layer .................................................................................................................. 16 LIST OF TABLES Table 1. Volume Status LED Decodes ............................................................................................ 8 Table 2. Treble/Bass Boost Status LED Decodes........................................................................... 8 Table 3. Initial CS44L11 Register Settings...................................................................................... 9 Table 4. Revision History .............................................................................................................. 20 2 DS640DB1 CDB44L11 1. CDB44L11 SYSTEM OVERVIEW The CDB44L11 is an excellent means of quickly demonstrating the CS44L11. The CS8420 digital audio interface receiver provides an interface to digital audio sources including the majority of digital audio test equipment. 2. SCHEMATIC DESCRIPTIONS 2.1 CS44L11 Headphone Monitor and Output Filter The CS44L11, shown in Figure 1, can accept sampling frequencies varying from 8 kHz to 96 kHz and can produce a PWM frequency ranging from 8 X Fs to 48 X Fs (refer to CS44L11 datasheet). In this design the 8 X Fs mode is used with a 48.25 kHz sample frequency (Fs), which will result in a 386 kHz PWM switching frequency. As shown in Figure 1, L3, L4, C29, and C30 form the 2nd order low pass LC filter for the output audio. The following equations show how to calculate the filter values: Cfilter = 0.707 / (6.283 * fc *RL) Lfilter = (1.414 * RL) / (6.283 * fc) where: fc = desired -3 dB frequency of the filter RL = the nominal speaker load impedance If you choose fc = 35 kHz, RL= 16 W, then: Cfilter = 0.707 / (6.283 * 35000 * 16) = 0.2009 µF Lfilter = (1.414 * 16) / (6.283 * 35000) = 102.881 µH Choosing practical component values: Cfilter = 0.22 µF Lfilter = 100 µH Output distortion is directly related to the inductor quality. The inductors should have a saturation current of at least 150 mA for RL= 16 Ω. This design uses the Central Technologies CTGSR74B 100 µH inductors for the output filter. 220 µF capacitors are used to block any DC signal from being heard at the output. For maximum output power, low ESR capacitors should be used on the output. DS640DB1 3 CDB44L11 2.2 Clocking The provided MCLK oscillator frequency is 12.352 MHz. Any oscillator between 6.4 MHz and 24.576 MHz may be used in the socket. The MCLK signal is divided by the clock divider to produce SCLK (MCKL/4), and LRCK (MCKL/256). Using a 12.352 MHz MCLK, SCLK is 3.088 MHz, and LRCK is 48.25 kHz. 2.3 CS8420 Sample Rate Converter Refer to Figure 2. The CS8420 is a S/PDIF receiver and sample rate converter. It is configured to accept data at any sample rate between 32 kHz and 96 kHz and transmits data in PCM audio data format based on the MCLK oscillator frequency. The CS8420, while not required, improves system performance by reducing clock jitter and providing one fixed output frequency. In this design, the 48.25 kHz sample rate was chosen so that the CS8420 does not perform 1:1 conversion when receiving 48 kHz input data. Noise can be introduced into the system when a 1:1 conversion is performed and should be avoided for optimal performance. For more information please refer to the CS8420 datasheet. 2.4 Microcontroller Figure 3 shows the host microcontroller circuitry. There are 8 buttons for control features, 5 LEDs to indicate status, and an I2C interface to the CS8420 and the CS44L11. See Table 3 for the initial CS44L11 register settings. After power is first applied to the board or the reset button is pressed, all settings will revert to the default settings. The board is populated with a Motorola MC68HC908GP32 with the software preprogrammed to run the CDB44L11. The microcontroller code was written in C and compiled with the 'COSMIC C Compiler'. The microcontroller uses the I2C control bus to read and write to the CS44L11 control registers - refer to CS44L11 data sheet for more information. 2.5 Power Supplies and Level-Shifting Figure 4 shows the power supply and level shifting circuitry. Due to the CS44L11 operating at below +5.0 V, level-shifting circuitry has been included to allow for operation with the microcontroller and the CS8420, both of which must run at +5.0 V. The CS44L11 uses a half bridge output stage and is therefore affected by power supply pumping. Power supply pumping is a phenomenon observed in half-bridge switching amplifiers. It is caused by stored energy in the output inductor that is fed back into the power supply during switching. To compensate for power supply pumping, a resistive load is used to dissipate the 4 DS640DB1 CDB44L11 switching current. In most designs this may be omitted due to other system components loading the supply line and dissipating the current. The resistive load is only used to simulate a circuit load. In the CS44L11, the output MOSFETs directly switch between ground and VA_HP, therefore the performance of the audio output from the amplifier is adversely affected any disturbance on the power rails. To get the best performance power supply characteristics and power supply de-coupling are critical. Dynamic Range will be affected by switching noise. To reduce switching noise large value power supply bypass capacitors must be used. This circuit uses a 0.1 µF and 1.0 µF ceramic capacitor as well as a 100 µF low ESR tantalum capacitor between the VA_HP supply rail and ground. Optimally these should be placed as close to the CS44L11 pins 12 and 13 as possible. If a DC-DC converter is used in the system its switching frequency should be locked to the CS44L11 PWM switching frequency to reduce switching noise. Power supply source impedance has a direct affect on the output distortion. A DC-DC converter is a very low impedance source and will offer the best THD+N performance. Using a linear power supply offers the next lowest impedance, while running directly from batteries to the VA_HP pins offers the highest impedance and therefore the highest distortion. A 47 µH inductor (L1) is used on the digital power supply of the CS44L11 to suppress noise. This may be omitted if system noise is not an issue in your design. DS640DB1 5 CDB44L11 3. OPERATION INFORMATION 3.1 Operating Instructions 1) Connect an optical or coaxial S/PDIF signal to the S/PDIF input (OPT1 or J5). 2) Connect the output to either headphones or an analog analyzer. If using the RCA test jacks (J8 and J9) a 16 Ω dummy load is provided in circuit. If using the headphone jack (J3) please use a 16 Ω dummy load or 16 Ω headphones. 3) Verify that all power supplies are turned off and: a. Connect +5.0 V to the terminal marked +5 V (J4). b. Connect from +1.8 V to +2.4 V to the terminal marked VD_HP (J6). c. Connect from +1.8 V to +2.4 V to the terminal marked VA_IN (J7). d. Connect the power supply common ground to the terminal marked GND. e. Verify that all power supply output voltages are set correctly to correspond to the setting on the CDB44L11 and apply power to the board. 4) Once power is applied the volume LEDs will illuminate. Adjust settings as required with buttons - note that the volume, bass, and treble buttons do not 'ramp' and must be pushed for each increment/decrement. The volume level will initialize at -24 dB. 6 DS640DB1 CDB44L11 4. CONTROL FUNCTIONS 4.1 Control Buttons The function of the Control Buttons (Tables 1 and 2) is as follows: • Volume Up - Adds 1 dB to current volume setting. • Volume Dn - Subtracts 1 dB from current volume setting. • Treble Up - Adds 1 dB to current treble setting. • Treble Dn - Subtracts 1 dB from current treble setting. • Bass Up - Adds 1 dB to current bass setting. • Bass Dn - Subtracts 1 dB from current bass setting. Mute - Mutes audio and sets PWM to modulated 50% duty cycle. Reset - Upon release of the RESET Button, the microcontroller loads the default settings from the flash memory into RAM. The RST line is pulled HI and these default settings are written to the CS44L11 and the CS8420. • • 4.2 LED Status The CDB44L11 has 5 LEDs (D20 - D24) to indicate volume, tone and mute settings and 1 fault LED (D25). The LED readout will normally indicate the volume level per Table 1. When one of the Treble Up/Down or Bass Up/Down buttons is pressed, the LEDs will show the Treble Boost or Bass Boost setting as depicted in Table 2. When the button is released the LEDs will continue to show the Treble/Bass Boost setting for a period of 2 seconds and will then return to indicating the volume setting. In Table 1 and Table 2, a “1” indicates that the LED is lit up. The MUTE button toggles operation between mute and un-mute. When the amplifier is muted the LEDs flash at a 0.5 Hz rate. D25 (LED near the CS8420 Receiver) indicates when there is a loss of input signal or any other problem in the receiver. DS640DB1 7 CDB44L11 Volume [dB] +12 LED Pattern D20 D21 D22 D23 D24 1 1 1 1 1 +11 1 1 1 1 0 +10 1 1 1 0 1 +9 1 1 1 0 0 +8 1 1 0 1 1 +7 1 1 0 1 0 +6 1 1 0 0 1 +5 1 1 0 0 0 +4 1 0 1 1 1 +3 1 0 1 1 0 +2 1 0 1 0 1 +1 1 0 1 0 0 0 1 0 0 1 1 -1 1 0 0 1 0 -2 1 0 0 0 1 -3 1 0 0 0 0 -4 0 1 1 1 1 -5 0 1 1 1 0 -6 0 1 1 0 1 -7 0 1 1 0 0 -8 0 1 0 1 1 -9 0 1 0 1 0 -10 0 1 0 0 1 -11 0 1 0 0 0 -15 to -12 0 0 1 1 1 -18 to -16 0 0 1 1 0 -21 to -19 0 0 1 0 1 -24 to -22 0 0 1 0 0 -32 to -25 0 0 0 1 1 -36 to -33 0 0 0 1 0 -42 to -37 0 0 0 0 1 -48 to -43 0 0 0 0 0 Treble or Bass Boost [dB] LED Pattern D20 D21 D22 D23 D24 0 1 1 1 1 1 1 1 1 1 1 0 2 1 1 1 0 1 3 1 1 1 0 0 4 1 1 0 1 1 5 1 1 0 1 0 6 1 1 0 0 1 7 1 1 0 0 0 8 1 0 1 1 1 9 1 0 1 1 0 10 1 0 1 0 1 11 1 0 1 0 0 12 1 0 0 1 1 Table 2. Treble/Bass Boost Status LED Decodes Table 1. Volume Status LED Decodes 8 DS640DB1 CDB44L11 4.3 CS44L11 Initialization Table 3 shows the CS44L11 register settings at startup. Refer to the CS44L11 Data Sheet for more information. Addr Function 2h Power and Muting Control 3h Channel A Volume Control default default 4h Channel B Volume Control default 5h Tone Control default 6h Mode Control 1 default 7h Limiter Attack Rate default 8h Limiter Release Rate default 9h Volume and Mixing Control Ah Mode Control2 Bh Mode Control 3 Ch Revision Indicator default default default default 7 6 5 4 3 2 1 0 SZC1 SZC0 PDN FLT RUPBYP RDNBYP Reserved Reserved 1 0 1 0 0 0 0 0 VOLA7 VOLA6 VOLA5 VOLA4 VOLA3 VOLA2 VOLA1 VOLA0 1 1 1 0 1 0 0 0 VOLB7 VOLB6 VOLB5 VOLB4 VOLB3 VOLB2 VOLB1 VOLB0 0 0 0 0 0 0 0 0 BB3 BB2 BB1 BB0 TB3 TB2 TB1 TB0 0 0 0 0 0 0 0 0 BBCF1 BBCF0 TBCF1 TBCF0 TC1 TC0 TC_EN LIM_EN 0 0 0 0 0 0 1 0 ARATE7 ARATE6 ARATE5 ARATE4 ARATE3 ARATE2 ARATE1 ARATE0 0 0 0 1 0 0 0 0 RRATE7 RRATE6 RRATE5 RRATE4 RRATE3 RRATE2 RRATE1 RRATE0 0 0 1 0 0 0 0 0 IS1 IS0 ATAPI3 ATAPI2 ATAPI1 ATAPI0 1 0 RMP_SP1 RMP_SP0 0 0 0 0 MCLKDIV CLKDV1 CLKDV0 DBS FRQSFT1 FRQSFT0 0 1 DEM1 DEM0 0 0 0 0 0 0 0 0 DIF1 DIF0 A=B VCBYP CP_EN FREEZE Reserved Reserved 0 0 1 0 1 0 0 0 Reserved Reserved Reserved Reserved REV3 REV2 REV1 REV0 0 0 0 0 Read Only Read Only Read Only Read Only Table 3. Initial CS44L11 Register Settings DS640DB1 9 Figure 1. CS44L11 PWM Headphone Amplifier CDB44L11 10 DS640DB1 Figure 2. CS8420 S/PDIF Receiver and Sample Rate Converter CDB44L11 DS640DB1 11 Figure 3. Microcontroller CDB44L11 12 DS640DB1 Figure 4. Power Supply CDB44L11 DS640DB1 13 CDB44L11 Figure 5. Assembly Drawing 14 DS640DB1 CDB44L11 Figure 6. Top Layer DS640DB1 15 CDB44L11 Figure 7. Bottom Layer 16 DS640DB1 DS640DB1 5. BILL OF MATERIALS Item Rev Description Qty Reference Designator MFG MFG P/N 1 A CAP 1 µF 10% 16V X7R 0805 9 C1 C15 C56 C60 C66 C67 C68 C69 C70 KEMET C0805C105K4RAC 2 A CAP 220 µF 10% 6V TANT CASE D 2 C2 C3 KEMET T491D227K006AS 3 A CAP 0.01 µF 10% 50V X7R 0805 2 C5 C61 KEMET C0805C103K5RAC 4 A CAP 100 µF 20% 6.3V TANT CASE C 0 C6 VISHAY SPRAGUE 595D107X06R3C2T 5 A CAP 0.1 µF 10% 50V X7R 0805 16 C8 C9 C10 C11 C20 C22 C24 C25 C26 C47 C55 C57 C63 C64 C65 C71 KEMET C0805C104K5RAC 6 A CAP 0.1 µF 10% 50V X7R 0805 0 C12 C16 KEMET C0805C104K5RAC 7 A CAP 0.33 µF 10% 16V X7R 0805 0 C13 C17 KEMET C0805C334K4RAC 8 A CAP, 100 µF 20% 6.3V TANT CASE C 1 C14 VISHAY SPRAGUE 595D107X06R3C2T 9 A CAP 0.33 µF 10% 16V X7R 0805 1 C18 KEMET C0805C334K4RAC 10 A CAP 4700 pF 5% 50V C0G 1206 1 C19 KEMET C1206C472J5GAC 11 A CAP 47 µF 20% 16V ELEC CASE C 2 C21 C23 PANASONIC ECEV1CA470WR 12 A CAP 1 µF 10% 25V X7R 1206 1 C27 KEMET C1206C105K3RAC 13 A CAP 0.22 µF 10% 50V X7R 1206 2 C29 C30 KEMET C1206C224K5RAC 14 A CAP 1000 pF 5% 50V X7R 0603 1 C32 KEMET C0603C102J5RAC 15 A CAP 33 pF 10% 50V C0G 0805 2 C52 C53 KEMET C0805C330K5GAC 16 A CAP 0.033 µF 10% 50V X7R 0805 1 C54 KEMET C0805C333K5RAC C58 KEMET C0805C103J5RAC 17 A CAP 0.01 µF 5% 50V X7R 0805 1 18 A LED CLR GRN, 2.1V 1mA .16MCD, SMD 5 19 A LED CLR SRED, 1.7V 1mA 1.6MCD, SMD 1 D25 20 A WIRE, JUMPER 2P, 0.1””CTR, BRASS 5 GNDTP1 GNDTP2 GNDTP3 GNDTP4 GNDTP5 21 A CONN, TEST PT, .1””CTR TIN PLATE BLK 2 HP_A HP_B KEYSTONE 5001 22 A CONN, BPOST 2”” SILV, NYLON INS, BLK 1 J1 JOHNSON COMPONENTS 111-0103-001 23 A HDR 6x2, MLE .1””CTR, S GLD 0 J2 SAMTEC TSW-106-07-G-D 24 A JACK STEREO HEADPHONE 1 J3 A/D ELECTRONICS 3056-50 25 A CONN, BPOST 2”” SILV, NYLON INS, RED 1 J4 JOHNSON COMPONENTS 111-0102-001 D20 D21 D22 D23 D24 CHICAGO MINIATURE CMD28-21VGC/TR8/T1 CHICAGO MINIATURE CMD28-21SRC/TR8/T1 COMPONENTS CORPORATION TP-101-10 CDB44L11 17 18 Item Rev Qty Reference Designator MFG MFG P/N A JACK RCA, RA-BLK, PHONO, GLD TABS 3 J5 J8 J9 A/D ELECTRONICS ARJ-2018-NIL-1-NIL 27 A CONN, BPOST 2”” SILV, NYLON INS, GRN 1 J6 JOHNSON COMPONENTS 111-0104-001 28 A CONN, BPOST 2”” SILV, NYLON INS, BLU 1 J7 JOHNSON COMPONENTS 111-0110-001 29 A CONN, DE9 FMLE, RT. ANGL 1 J10 ADAM TECH DE09-SL-24 30 A HDR 3x1, MLE .1””CTR, S GLD 1 J11 SAMTEC TSW-103-07-G-S 31 A HDR 3x1, MLE .1””CTR, S GLD 0 J14 SAMTEC TSW-103-07-G-S 32 A IND 47 µH, 10%, 1210 2 L1 L8 PANASONIC ELJFA470KF 33 A IND 100 µH 20% CTGSR74B SERIES SM 2 L3 L4 CENTRAL TECHNOLOGIES CTGSR74B-101M 34 A IND 220 µH 20% CTGS54 SERIES SM 0 L5 CENTRAL TECHNOLOGIES CTGS54-220M 35 A IND 4.7 µH 10% 0805 1 L9 PANASONIC ELJFD4R7KF 36 A CONN, TEST PT, .1””CTR TIN PLATE BLK 0 LRCK MCLK SCLK SDIN KEYSTONE 5001 37 A OPTICAL RCVR, 6Mb/s, 7V 20MA 10M 1 OPT1 TOSHIBA TORX173 38 A TRAN, MOSFET nCHAN 750mA 20V SOT-23 1 Q1 MOTOROLA MGSF1N02ELT1 39 A RES 2.2k OHM 1/8W 5% 0805 FILM 7 R1 R5 R61 R62 R63 R64 R65 DALE CRCW0805222J 40 A RES 1k OHM 1/16W 1% 0603 FILM 1 R2 DALE CRCW06031001F 41 A RES 16 OHM 1/8W 5% 0805 FILM 2 R3 R17 DALE CRCW0805160J 42 A RES 5.1k OHM 1/8W 5% 0805 FILM 1 R4 DALE CRCW0805512J 43 A RES 0 OHM 1/8W 1% 1206 FILM 0 R6 R7 DALE CRCW1206000Z 44 A RES 51.1k OHM 1/16W 1% 0603 FILM 0 R8 DALE CRCW06035112F 45 A RES 10k OHM 1/16W 1% 0603 FILM 2 R9 R18 DALE CRCW06031002F 46 A RES 0 OHM 1/8W 1% 1206 FILM 1 R10 DALE CRCW1206000Z 47 A RES 1.62k OHM 1/16W 1% 0603 FILM 1 R11 DALE CRCW06031621F 48 A RES 0 OHM 1/10W 1% 0805 FILM 1 R12 DALE CRCW0805000Z 49 A RES 10k OHM 1/8W 5% 0805 FILM 3 R14 R59 R68 VISHAY CRCW0805103J 50 A RES 1 OHM 1/8W 5% 1206 FILM 1 R15 DALE CRCW12061R0J 51 A RES 158k OHM 1/16W 1% 0603 FILM 0 R16 DALE CRCW06031583F 52 A RES 432k OHM 1/16W 1% 0603 FILM 0 R19 DALE CRCW06034323F CDB44L11 DS640DB1 Description 26 DS640DB1 Item Rev Description Qty Reference Designator MFG MFG P/N 53 A RES 191k OHM 1/16W 1% 0603 FILM 0 R20 DALE CRCW06031913F 54 A RES 137k OHM 1/16W 1% 0603 FILM 0 R21 DALE CRCW06031373F 55 A RES 69.8k OHM 1/16W 1% 0603 FILM 2 R22 R24 DALE CRCW06036982F 56 A RES 240 OHM 1/8W 5% 1206 FILM 2 R23 R25 DALE CRCW1206241J 57 A RES POT 500K 10%10TURN TOP-ADJ TH 0 R26 BOURNS 3266W-1-504 58 A RES 10M OHM 1/10W 1% 0805 FILM 1 R57 DALE CRCW08051005F 59 A RES 330k OHM 1/8W 5% 0805 FILM 1 R58 DALE CRCW0805334J 60 A RES 33 OHM 1/8W 5% 0805 FILM 3 R66 R67 R78 PANASONIC ERJ6GEYJ330V 61 A RES 75 OHM 1/10W 1% 0805 FILM 1 R76 DALE CRCW080575R0F 62 A SWITCH 0/1 TACT, W/ESD 8 S1 S2 S3 S4 S5 S6 S7 S8 C&K PTS645TL50 63 A IC, DIGITAL PWM HEADPHONE MONITOR,T 1 U1 CIRRUS LOGIC CS44L11-KZ/A 64 A IC LOG 8-BIT W/3-ST OUT REG SOIC16 1 U2 TEXAS INSTRUMENTS SN74HC590AD 65 A IC LIN H-CUR L-NOISE CNVTR SSOP16 0 U3 MAXIM MAX1706EEE 66 A IC LOG, INVERT, 5P, UHS TINY, SOT23 2 U4 U20 FAIRCHILD SEMICONDUCTOR NC7SZ04M5X 67 A IC LOG, 4 BUF W/3ST 14P TSSOP 2 U5 U6 FAIRCHILD SEMICONDUCTOR 74VHC125MTC 68 A IC PGM, mCNTR 32K PQFP44 1 U17 MOTOROLA MC68HC908GP32CFB A IC LNR 5V MCH RS-232 DRV/RCV SOIC16 1 U18 MAXIM MAX232CWE 70 D1 IC CRUS DIG AUD SAMP RTE CNV SOIC28 1 U23 CRYSTAL SEMICONDUCTOR CS8420-CS/D1 71 A SPCR, STANDOFF 4-40 THR, 0.875””L 4 X1 X2 X3 X4 KEYSTONE 1809 72 A OSC 32.768KHZ 20ppm 8mm x 3.8mm SMT 1 Y1 CITIZEN CM200S32.768KDZFT 73 A OSC 12.352MHZ 50PPM 5V FULL DIP14 1 Y2 CAL CRYSTAL CX21AF-12.3520MHZ 74 A DIODE, SCHTKY POWER RECT, SOD123 0 Z2 MOTOROLA MBR0520LT1 75 A DIODE TRANS. SUPPRESSOR, 6.8V, 600W 3 Z3 Z4 Z5 MOTOROLA P6KE6.8 76 D CONN, SHUNT, 2P, .1””CTR, BLK 3 XJ2,XJ11,XJ14 MOLEX 15-29-1025 19 CDB44L11 69 CDB44L11 6. REVISION HISTORY Release Date DB1 Changes April 2004 Initial Release Table 4. Revision History Contacting Cirrus Logic Support For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find the one nearest to you go to www.cirrus.com IMPORTANT NOTICE Cirrus Logic, Inc. and its subsidiaries (“Cirrus”) believe that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided “AS IS” without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. 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