23611

` 5.0V Stereo Audio ADC with 3.3 V Tolerant Digital Interface
` Supports 96 kHz Sample Rates
` Supports 16/20/24-Bit Word Lengths
` Multibit Sigma Delta Modulators with "Perfect Differential Linearity Restoration" for Reduced Idle Tones and Noise Floor
` 105 dB (typ) Dynamic Range
` 95 dB (typ) S/(THD+N)
` Supports 256/512 and 768 xFs Master Clocks
` Flexible Serial Data Port Allows Right-Justified, Left-Justified, I2S-Compatible and DSP Serial Port Modes Cascadable (up to 4 devices) from a single DSP
SPORT
` Device Control via SPI compatible serial port or optional control pins
` On-Chip Reference 28-Lead SSOP Package.

· Professional Audio
· Mixing Consoles
· Musical Instruments
· Digital Audio Recorders, Including CD-R, MD, DVD-R, DAT, HDD
· Home Theatre Systems
· Automotive Audio Systems
· Multimedia

The AD1871 is a stereo audio ADC intended for digital audio applications requiring high performance analog-to-digital conversion. It features two 24-bit conversion channels each with programmable gain amplifier (PGA), multi-bit sigma-delta modulator and decimation filters. Each channel provides 95 dB of THD+N and 105 db of Dynamic Range making the AD1871 suitable for applications such as Digital Audio Recorders and Mixing Consoles.

Each of the AD1871's input channels (Left and Right) can be configured as either differential or single-ended (two inputs muxed with internal single-ended to differential conversion).

The input PGA features a gain range of 0 dB to +12 dB in steps of 3 dB.The modulator features a proprietary multi-bit architecture which realises optimum performance over an audio bandwidth with standard audio sampling rates of 32 kHz up to 96 kHz. The decimation filter response features very-low passband ripple and excellent stopband attenuation.

The AD1871's audio data interface supports all common interface formats such as I2S, Left-Justified, Right-Justified as well as other modes which allow for convenient hook-up to general purpose digital signal processors (DSPs). The AD1871 also features an SPI compatible serial control port which allows for convenient control of device parameters and functionality such as sample word-width, PGA-settings, interface-modes etc.

The AD1871 operates from a single +5V power supply - with optional digital interfacing capability of +3.3V. It is housed in a 28-lead SSOP package and is characterised for operation over the temperature range -40 to 105.