TEXAS INSTRUMENTS DEM-PCM3500 handbook
Contents
1. Slave Mode Enabled TABLE I DIP Switch Settings CRYSTAL OSCILLATOR OPERATION The PCM3500 contains an internal crystal oscillator circuit The oscillator can be used to generate the 512fg system clock 512 times the desired sample frequency The crystal value must be equal to alt A fundamental mode parallel resonant crystal is recommended The load capacitors Cz should be set in the range from 10pF 33pF with 22pF being the typical value When using the crystal oscillator BCK and FS should be derived from SCKIO when using Slave mode Alternatively the PCM3500 may be set to Master mode so that the BCK and FS are generated by the CODEC itself swi DSS105 PWDN o Loop o HPFD o OD J DO NMD A O0O MND FIGURE 1 Schematic BURR BROWNO DEM PCM3500 PCM3500 0000000000000 000000000006000 CSC Me Ter t 900009000000000 0b000000000000 40 0000005600000000000 000000000000000000 90000000000000900000 o 00000000000000000 O 000000000000000000 000000000000000010 000000000000000000 000000000000900000 2000000000000000000 2000000000000000000 0000000000000500000 0000000000000600000 000000000000600000 2000000000000000000 Bottom Layer 00069000000000 000640000000 0c00V0VV00oVOVoco 0000950000990 002. 0006000009800 0000000000220 0600000000000 EE ee 000000000 cVUVV E om 0000090000000 kaonan a 00000090000 Ai ageossocodccacals VVOCODOCOOGOGS OoOooooOooooeoool 2 o o o o o o Silk Screen FIGURE 2 Printed Circuit Board Plots BURR BROWN 3 DEM PCM3500 IMPORTANT NOTICE Texas Instruments and its subsidiaries Tl reserve the right to make changes to their products or to discontinue any product or service without notice and advise customers to obtain the latest version of relevant information to verify before placing orders that information being relied on is current and complete All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment including those pertaining to warranty patent infringement and limitation of liability Tl warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with Tl s standard warranty Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty Specific testing of all parameters of each device is not necessarily performed except those mandated by government requirements Customers are responsible for their applications using TI components In order to minimize risks associated with the customer s applications adequate design and operating safeguards must be provided by the customer to minimize inherent or proc
3. 2576 D EM PCM 3500 hv f5 SBAU028 BURR BROWN DEM PCM3500 EVALUATION BOARD INSTRUCTION MANUAL FEATURES EVALUATION BOARD FOR THE PCM3500 MODEM VOICE CODEC O DIP SWITCH FOR SETTING HARDWARE MODE CONTROLS O CONNECTORS FOR SERIAL INTERFACE SYSTEM CLOCK ANALOG INPUT OUTPUT AND POWER SUPPLIES O PROTOTYPE AREA FOR BUILDING ANA LOG FRONT END AFE CIRCUITS O SINGLE POWER SUPPLY 2 7V to 3 6V BLOCK DIAGRAM DESCRIPTION The DEM PCM3500 is a simple evaluation board for the PCM3500 single channel CODEC It is designed for quick evaluation of the PCM3500 features and performance A prototype area allows for external analog input and output circuitry to be mounted di rectly on the evaluation board Power Supply Digital PCM3500 Analog OUT Interface DUT Analog IN CMOS 3 3V or TTL Logic Mode Control Switch International Airport Industrial Park Mailing Address PO Box 11400 Tucson AZ 85734 Street Address 6730 S Tucson Blvd Tucson AZ 85706 Tel 520 746 1111 Twx 910 952 1111 Internet http www burr brown com Cable BBRCORP Telex 066 6491 FAX 520 889 1510 Immediate Product Info 800 548 6132 1999 Burr Brown Corporation LI 536A Printed in U S A August 1999 CONNECTORS CN1 is the power supply connector for the DEM PCM3500 The Vcc pin may be set between 2 7V and 3 6V The GND pin should be connected to the negative or ground terminal of the p
4. edural hazards Tl assumes no liability for applications assistance or customer product design TI does not warrant or represent that any license either express or implied is granted under any patent right copyright mask work right or other intellectual property right of TI covering or relating to any combination machine or process in which such semiconductor products or services might be or are used Tl s publication of information regarding any third party s products or services does not constitute Tl s approval warranty or endorsement thereof Copyright 2000 Texas Instruments Incorporated
5. ower supply or battery and functions as the analog ground connection CN is the host interface connector It includes connections for the serial interface and system clock input output The connec tor pins correspond directly to the pin names of the PCM3500 Refer to the PCM3500 data sheet for more details regarding the operation and requirements for these connections CN3 is the analog input connector The Vj pin is connected to the PCM3500 analog to digital converter input while the GND pin is connected to analog ground The full scale input voltage for Viy is 0 6Vcc in Vp p or 1 8Vp p for a 3V power supply CN4 is the analog output connector The Voyr pin is con nected to the PCM3500 digital to analog converter output while the GND pin is connected to analog ground The full scale output voltage at V oyr is typically 0 6V c in Vp p or 1 8Vp p for a 3V power supply DIP SWITCH SETTINGS Table I shows the function of each switch setting for SW1 Each switch corresponds directly to a pin of the PCM3500 Refer to the PCM3500 data sheet for more details regarding the operation and requirements for these pin functions CI J osscar O H Power Down Disabled normal operation L Power Down Enabled H ADC to DAC Loop Back Enabled L ADC to DAC Loop Back Disabled H ADC High Pass Filter Disabled L ADC High Pass Filter Enabled H Time Slot Mode Enabled L Time Slot Mode Disabled H Master Mode Enabled L
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TEXAS INSTRUMENTS DEM PCM3500 handbook