AD1870 Datasheet | Analog Devices

a Single-Supply 16-Bit ⌺-⌬ Stereo ADC Features Single 5 V Power Supply Single-Ended Dual-Channel Analog Inputs 92 d B (Typ) Dynamic Range 90 d B (Typ) S/(THD + N) 0.006 d B Decimator Pass-Band Ripple Fourth Order, 64؋ Oversampling ⌺-⌬ Modulator Three-Stage, Linear-Phase Decimator 256 ؋ f S or 384 ؋ f S Input Clock Less than 100 ␮W (Typ) Power-Down Mode Input Overrange Indication On-Chip Voltage Reference Flexible Serial Output Interface 28-Lead SOIC Package APPLICATIONS Consumer Digital Audio Receivers Digital Audio Recorders, Including Portables CD-R, DCC, MD, and DAT Multimedia and Consumer Electronics Equipment Sampling Music Synthesizers PRODUCT OVERVIEW The AD1870 is a stereo, 16-bit oversampling ADC based on sigma-delta (⌺-⌬) technology intended primarily for digital audio bandwidth applications requiring a single 5 V power supply. Each single-ended channel consists of a fourth order one-bit noise shaping modulator and a digital decimation filter. An on-chip voltage reference, stable over temperature and time, defines the full-scale range for both channels. Digital output data from both channels are time multiplexed to a single, flexible serial interface. The AD1870 accepts a 256 × f S or a 384 × f S input clock (f S is the sampling frequency) and operates in both serial port Master and Slave Modes. In Slave Mode, all clocks must be externally derived from a mon source. Input signals are sampled at 64 × f S onto internally buffered switched capacitors, eliminating external sample-and-hold amplifiers and minimizing the requirements for antialias filtering at the input. With simplified antialiasing, linear phase can be preserved across the pass band. The on-chip single-ended-to-differential signal converters save the board designer from having to provide them externally. The AD1870’s internal differential architecture provides increased dynamic range and excellent power supply rejection characteristics. The AD1870’s proprietary fourth order differential...