AD1876

a FEATURES Autocalibrating 0.002% THD 90 dB S/(N+D) 1 MHz Full Power Bandwidth On-Chip Sample & Hold Function 2؋ Oversampling for Audio Applications 16-Pin DIP Package Serial Twos Complement Output Format Low Input Capacitance–typ 50 pF AGND Sense for Improved Noise Immunity VIN 10 AGND SENSE 9 INPUT BUFFERS 16-Bit 100 kSPS Sampling ADC AD1876 FUNCTIONAL BLOCK DIAGRAM A CHIP 16-BIT DAC CAL DAC LOGIC TIMING LEVEL TRANSLATORS COMP VREF 11 AGND 8 15 BUSY 14 D OUT CLK PRODUCT DESCRIPTION CAL 16 CLK SAMPLE 2 1 The AD1876 is a 16-bit serial output sampling A/D converter which uses a switched capacitor/charge redistribution architecture to achieve a 100 kSPS conversion rate (10 µs total conversion time). Overall performance is optimized by digitally correcting internal nonlinearities through on-chip autocalibration. The circuitry of the AD1876 is partitioned onto two monolithic chips, a digital control chip fabricated with Analog Devices’ DSP CMOS process and an analog ADC chip fabricated with the BiMOS II process. Both chips are contained in a single package. The serial output interface requires an external clock and sample command signal. The output data rate may be as high as 2.08 MHz, and is controlled by the external clock. The twos complement format of the output data is MSB first and is directly compatible with the NPC SM5805 digital decimation filter used in consumer audio products. The AD1876 is also compatible with a variety of DSP processors. The AD1876 is packaged...