1.1 Features

? 16-bit oversampling sigma-delta A/D converter

? 16-bit oversampling sigma-delta D/A converter

? Maximum output conversion rate:

– 22 ksps with on-chip FIR filter

– 88 ksps with FIR bypassed

? Voiceband bandwidth in FIR-bypassed mode and final sampling rate at 8 ksps

– 90-dB SNR/ADC and 87-dB SNR/DAC with DSP’s FIR (FIR bypassed @ 88 ksps/5 V)

– 87-dB SNR/ADC and 85-dB SNR/DAC with DSP’s FIR (FIR bypassed @88 ksps/3.3 V)

? On-chip FIR produced 84-dB SNR for ADC and 85-dB SNR for DAC over 11-kHz BW

? Built-in functions including PGA, antialiasing analog filter, and operational amplifiers for general-purpose

interface (such as MIC interface and hybrid interface)

? Glueless serial port interface to DSPs (TI TMS320UC54x or standard DSPs)

? Automatic cascading detection (ACD) makes cascade programming simple and allows up to 8 devices to

be connected in cascade.

? On-fly reconfiguration modes include secondary-communication mode and direct-configuration mode (host

interface).

? Continuous data-transfer mode for use with autobuffering (ABU) to reduce DSP interrupt service overhead

? Event-monitor mode provides external-event control, such as RING/OFF-HOOK detection

? Programmable ADC and DAC conversion rate

? Programmable input and output gain control

? Separate software control for ADC and DAC power-down

? Low-voltage (DVDD1) 1.1-V to 3.6-V digital I/O

? Analog (AVDD1 and AVDD2) 3 V to 5.5 V core power supply

? Digital (DVDD2) 3 V to 5.5 V core power supply

? Power dissipation (PD) of 39 mW typical for 8-ksps at 3.3 V

? Hardware power-down mode to 0.2 mW

? Internal and external reference voltage (Vref)

? Differential and single-ended analog input/output

? 2s-complement data format

? Test mode, which includes digital loopback and analog loopback

? 600-Ω output driver