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AD1876 Datasheet

  • AD1876

  • 16-Bit 100 kSPS Sampling ADC

  • 12頁

  • AD

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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鈥搕yp 50 pF
AGND Sense for Improved Noise Immunity
V
IN
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
V
REF
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
碌s
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鈥?/div>
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 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
鹵
12 V supplies; typical power con-
sumption is 235 mW. The digital supply (V
DD
) is isolated from
the linear supplies (V
EE
and V
CC
) for reduced digital crosstalk.
Separate analog and digital grounds are also provided.
MICROCODED
CONTROLLER
SAR
ALU
RAM
3
D
OUT
D CHIP
AD1876
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703

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