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
16-Bit 100 kSPS
FUNCTIONAL BLOCK DIAGRAM
AGND SENSE 9
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
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 di-
rectly compatible with the NPC SM5805 digital decimation fil-
ter used in consumer audio products. The AD1876 is also
compatible with a variety of DSP processors.
The AD1876 is packaged in a space saving 16-pin plastic DIP
and operates from +5 V and ± 12 V supplies; typical power con-
sumption is 235 mW. The digital supply (VDD) is isolated from
the linear supplies (VEE and VCC) for reduced digital crosstalk.
Separate analog and digital grounds are also provided.
14 D OUT CLK
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