SLAS366 datasheet(7/58 Pages) TI2

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1 Introduction

The TLV320AIC14 is a true low-cost, low-power, high-performance, highly-integrated voiceband codec designed with

new technological advances. The TLV320AIC14 provides high resolution signal conversion from digital-to-analog

(D/A) and from analog-to-digital (A/D) using oversampling sigma-delta technology with programmable sampling rate.

1.1

Description

The TLV320AIC14 implements the smart time division multiplexed serial port (SMARTDM

). This is TI’s design

innovation to optimize DSP performance with its most advanced synchronous serial port in TDM format for glue-free

interface to popular DSPs (i.e., C5x, C6x) and microcontrollers. The SMARTDM supports both continuous data

transfer mode and on-the-fly reconfiguration programming mode. SMARTDM maximizes the bandwidth of data

transfer between the TLV320AIC14 DSP codec and the DSP. In normal operation, it automatically detects the number

of codecs in the serial interface and adjusts the number of time slots to match the number of codecs so that no time

slot in the TDM frame is wasted. In the turbo mode, it maintains the same number of time slots but maximizes the

bit transferred rate to 25 MHz to give the DSP more bandwidth to process other tasks in the same sampling period.

The SMARTDM technology allows up to 16 codecs to share a single 4-wire serial bus.

The TLV320AIC14 also provides a flexible host port. The host port interface is a two-wire serial interface that can be

programmed to be either an industrial standard I2C or a simple S2C (start-stop communication protocol).

The TLV320AIC14 also integrates all of the critical functions needed for most voice-band applications including MIC

preamp, handset/headset preamps, antialiasing filter (AAF), input/output programmable gain amplifier (PGA), and

selectable low-pass IIR/FIR filters.

The TLV320AIC14 implements an extensive power management; including device power-down, independent

software control for turning off ADC, DAC, op-amps, and IIR/FIR filter (bypassable) to maximize system power

conservation. The TLV320AIC14 consumes only 10 mW at 3 V.

The TLV320AIC14’s low power operation from 2.7 V to 3.6 V for analog and I/O and 1.65 V to 1.95 V for digital core

power supplies, along with extensive power management, make it ideal for portable applications including wireless

accessories, hands free car kits, VOIP, cable modem, and speech processing. Its low group delay characteristic

makes it suitable for single or multichannel active control applications.

The TLV320AIC14 is characterized for commercial operation from 0

°C to 70°C and industrial operation from –40°C

to 85

°C.

1.2

Features

•

C54x Software Driver Available

•

16-Bit Oversampling Sigma-Delta A/D Converter

•

16-Bit Oversampling Sigma-Delta D/A Converter

•

Support Maximum Master Clock of 100 MHz to Allow DSPs Output Clock to Be Used as Master Clock

•

Selectable FIR/IIR Filter With Bypassing Option

•

Programmable Sampling Rate up to:

–

Max 26 KSPS With On-Chip IIR/FIR Filter

–

Max 104 KSPS With IIR/FIR Bypassed

•

On-Chip FIR Produced 84-dB SNR for ADC and 91-dB SNR for DAC Over 13-kHz BW

•

External DSPs IIR/FIR for a Final Sampling Rate of 8 Ksps (IIR/FIR Bypassed) Produced 87-dB SNR for

ADC and 92-dB SNR for DAC.

SMARTDM is a trademark of Texas Instruments.

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