®
PCM
350
0
PCM3500
For most current data sheet and other product
information, visit www.burr-brown.com
Low Voltage, Low Power, 16-Bit, Mono
VOICE/MODEM CODEC
TM
FEATURES
q
16-BIT DELTA-SIGMA DAC AND ADC
q
DESIGNED FOR MODEM ANALOG FRONT END:
Supports up to 56kbps Operation
q
ANALOG PERFORMANCE:
Sampling Frequency: 7.2kHz to 26kHz
Dynamic Range: 88dB (typ) at f
S
= 8kHz, f
IN
= 1kHz
q
SYSTEM CLOCK: 512f
S
q
MASTER OR SLAVE OPERATION
q
ON-CHIP CRYSTAL OSCILLATOR CIRCUIT
q
ADC-TO-DAC LOOP-BACK MODE
q
TIME SLOT MODE SUPPORTS UP TO
FOUR CODECs ON A SINGLE SERIAL
INTERFACE
q
POWER-DOWN MODE: 60
µ
A (typ)
q
POWER SUPPLY: Single +2.7V to +3.6V
q
SMALL PACKAGE: SSOP-24
APPLICATIONS
q
SOFTWARE MODEMS FOR:
Personal Digital Assistant
Notebook and Hand-Held PCs
Set-Top Box
Digital Television
Embedded Systems
q
PORTABLE VOICE RECORDER/PLAYER
q
SPEECH RECOGNITION/SYNTHESIS
q
TELECONFERENCING PRODUCTS
DESCRIPTION
The PCM3500 is a low cost, 16-bit CODEC designed
for modem Analog Front End (AFE) and speech pro-
cessing applications. The PCM3500’s low power op-
eration from +2.7V to +3.6V power supplies, along
with an integrated power-down mode, make it ideal for
portable applications.
The PCM3500 integrates all of the functions needed for
a modem or voice CODEC, including delta-sigma
digital-to-analog and analog-to-digital converters, in-
put anti-aliasing filter, digital high-pass filter for DC
blocking, and an output low-pass filter. The synchro-
nous serial interface provides for a simple, or glue-free
interface to popular DSP and RISC processors. The
serial interface also supports Time Division Multiplex-
ing (TDM), allowing up to four CODECs to share a
single 4-wire serial bus.
V
IN
AAF
AGND
V
REF
1
V
COM
V
REF
2
V
OUT
SMF
AGND
Reference
∆Σ
Modulator
(ADC)
Decimation
Digital Filter
HPF
FS
BCK
DIN
Loop
Serial I/O Interface
DOUT
Multi-Level
DAC
∆Σ
Modulator
Interpolation
Digital Filter
Clock
Gen/
OSC
FSO
SCKIO
Power
Mode Control
V
CC
AGND
DGND
V
DD
PDWN
LOOP
HPFD
M/S
TSC
XTO
XTI
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
PDS-1524B
1
Printed in U.S.A.
PCM3500
February, 2000
SBAS117
TI [ TEXAS INSTRUMENTS ]
