AD7896_15 Datasheet, PDF (1/15 Pages) Analog Devices – 2.7 V to 5.5 V, 12-Bit, 8s ADC in 8-Lead SOIC/PDIP

FEATURES
100 kHz Throughput Rate
Fast 12-Bit Sampling ADC with 8 ␮s Conversion Time
8-Lead PDIP and SOIC
Single 2.7 V to 5.5 V Supply Operation
High Speed, Easy-to-Use Serial Interface
On-Chip Track-and-Hold Amplifier
Analog Input Range Is 0 V to Supply
High Input Impedance
Low Power: 9 mW Typ
2.7 V to 5.5 V, 12-Bit, 8 ␮s
ADC in 8-Lead SOIC/PDIP
AD7896
FUNCTIONAL BLOCK DIAGRAM
AD7896
TRACK-AND-HOLD
V_IN
V_DD
12-BIT
ADC
CONVST
CLOCK
OUTPUT
REGISTER
AGND DGND BUSY SCLK SDATA
GENERAL DESCRIPTION
The AD7896 is a fast, 12-bit ADC that operates from a single
2.7 V to 5.5 V supply and is housed in small 8-lead PDIP and
8-lead SOIC packages. The part contains an 8 µs successive
approximation ADC, an on-chip track-and-hold amplifier, an
on-chip clock, and a high speed serial interface.
Output data from the AD7896 is provided via a high speed,
serial interface port. This 2-wire serial interface has a serial
clock input and a serial data output with the external serial
clock accessing the serial data from the part.
In addition to the traditional dc accuracy specifications, such as
linearity, full-scale, and offset errors, the AD7896 is also speci-
fied for dynamic performance parameters, including harmonic
distortion and signal-to-noise ratio.
The part accepts an analog input range of 0 V to V_DD and operates
from a single 2.7 V to 5.5 V supply, consuming only 9 mW
typical. The V_DD input is also used as the reference for the part
so that no external reference is required.
The AD7896 features a high sampling rate mode and, for low
power applications, a proprietary automatic power-down mode
where the part automatically goes into power-down once conver-
sion is complete and “wakes up” before the next conversion cycle.
The part is available in a small, 8-lead, 0.3'' wide, plastic or
hermetic dual-in-line package (PDIP) and in an 8-lead, small
outline IC (SOIC).
PRODUCT HIGHLIGHTS
1. Complete, 12-bit ADC in an 8-Lead Package.
The AD7896 contains an 8 µs ADC, a track-and-hold ampli-
fier, control logic, and a high speed serial interface, all in an
8-lead PDIP. The V_DD input is used as the reference for the
part, so no external reference is needed. This offers consider-
able space saving over alternative solutions.
2. Low Power, Single-Supply Operation.
The AD7896 operates from a single 2.7 V to 5.5 V supply
and consumes only 9 mW typical. The automatic power-
down mode, where the part goes into power down once
conversion is complete and “wakes up” before the next con-
version cycle, makes the AD7896 ideal for battery-powered
or portable applications.
3. High Speed Serial Interface.
The part provides high speed serial data and serial clock lines
allowing for an easy, 2-wire serial interface arrangement.
Rev. D
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