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AD7872 Datasheet PDF : 24 Pages
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Data Sheet
LC2MOS
Complete 14-Bit, Sampling ADCs
AD7871/AD7872
FEATURES
Complete monolithic 14-bit ADC
Twos complement coding
Parallel, byte, and serial digital interface
80 dB SNR at 10 kHz input frequency
57 ns data access time
Low power: 50 mW typ
83 kSPS throughput rate
APPLICATIONS
Digital signal processing
High speed modems
Speech recognition and synthesis
Spectrum analysis
DSP servo control
GENERAL DESCRIPTION
The AD7871/AD7872 are fast, complete, 14-bit analog-to-
digital converters (ADC). They consist of a track-and-hold
amplifier, successive approximation ADC, 3 V buried Zener
reference, and versatile interface logic. The ADC features a self-
contained, laser trimmed internal clock, so no external clock
timing components are required. The on-chip clock may be
overridden to synchronize ADC operation to the digital system
for minimum noise.
The AD7871 offers a choice of three data output formats: a
single, parallel, 14-bit word; two 8-bit bytes or a 14-bit serial
data stream. The AD7872 is a serial output device only. The two
parts are capable of interfacing to all modern microprocessors
and digital signal processors.
The AD7871/AD7872 operate from ±5 V power supplies,
accept bipolar input signals of ±3 V and can convert full power
signals up to 41.5 kHz.
In addition to the traditional dc accuracy specifications, the
AD7871/AD7872 are also fully specified for dynamic
performance parameters including distortion and signal-to-
noise ratio.
FUNCTIONAL BLOCK DIAGRAMS
AGND
22
CREF
23
REF OUT VIN
25
26
VDD
21
TRACK-
R
AND-HOLD
3V
REFERENCE
R
14-BIT
DAC
COMP
CLK 5
CLOCK
14/8/CLK 28
CONVST 1
CONTROL
LOGIC
SAR +
COUNTER
PARALLEL
AND SERIAL
INTERFACE
AD7871
2
3
4
CS RD BUSY/INT
6
20
14
27
DB13 DB0 DGND VSS
Figure 1.
AGND
12
CREF
11
REF OUT VIN
13
14
R
VDD VDD
9
16
TRACK-
AND-HOLD
3V
REFERENCE
R
14-BIT
DAC
COMP
CLK 3
CONTROL 1
CONVST 2
CLOCK
CONTROL
LOGIC
SAR +
COUNTER
SERIAL
INTERFACE
AD7872
4
5
6
SSTRB SCLK SDATA
Figure 2.
8
15
DGND VSS
Both devices are fabricated in Analog Devices, Inc., LC2MOS
mixed technology process. The AD7871 is available in 28-pin
PDIP, PLCC, and CERDIP packages. The AD7872 is available in
a 16-pin PDIP, CERDIP, and SOIC packages.
PRODUCT HIGHLIGHTS
1. Complete 14-Bit ADC on a Chip.
2. Dynamic Specifications for DSP Users.
3. Low Power.
Rev. E
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