GENERAL DESCRIPTION

The CS53L21 is a highly integrated, 24-bit, 96 kHz, low power stereo A/D. Based on multi-bit, delta-sigma modulation, it allows infinite sample rate adjustment between 4 kHz and 96 kHz. The ADC offers many fea tures suitable for low power, portable system applications.

FEATURES

♦ 98 dB Dynamic Range (A-wtd)

♦ -88 dB THD+N

♦ Analog Gain Controls

– +32 dB or +16 dB MIC Pre-Amplifiers

– Analog Programmable Gain Amplifier (PGA)

♦ +20 dB Digital Boost

♦ Programmable Automatic Level Control (ALC)

– Noise Gate for Noise Suppression

– Programmable Threshold and Attack/Release Rates

♦ Independent Left/Right Channel Control

♦ Digital Volume Control

♦ High-Pass Filter Disable for DC Measurements

♦ Stereo 3:1 Analog Input MUX

♦ Dual MIC Inputs

– Programmable, Low Noise MIC Bias Levels

– Differential MIC Mix for Common Mode Noise Rejection

♦ Very Low 64 Fs Oversampling Clock Reduces Power Consumption

SYSTEM FEATURES

♦ 24-bit Conversion

♦ 4 kHz to 96 kHz Sample Rate

♦ Multi-bit Delta Sigma Architecture

♦ Low Power Operation

– Stereo Record (ADC): 8.72 mW @ 1.8 V

– Stereo Record (MIC to PGA and ADC): 13.73 mW @ 1.8 V

♦ Variable Power Supplies

– 1.8 V to 2.5 V Digital & Analog

– 1.8 V to 3.3 V Interface Logic

♦ Power Down Management

– ADC, MIC Pre-Amplifier, PGA

♦ Software Mode (I²C® & SPI™ Control)

♦ Hardware Mode (Stand-Alone Control)

♦ Flexible Clocking Options

– Master or Slave Operation

♦ Digital Routing Mixes

– Mono Mixes

APPLICATIONS

♦ Portable Audio Players

♦ Digital Microphones

♦ Digital Voice Recorders

♦ Voice Recognition Systems

♦ Audio/Video Capture Cards