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