1 MSPS, 8-Channel, Software-Selectable,
True Bipolar Input, 12-Bit Plus Sign ADC
Data Sheet
AD7329
FEATURES
FUNCTIONAL BLOCK DIAGRAM
MUX
+
MUX
–
OUT
REF /REF
IN OUT
ADC
–
ADC
+
V
V
CC
OUT
IN
IN
DD
12-bit plus sign SAR ADC
True bipolar input ranges
2.5V
VREF
Software-selectable input ranges
10 V, 5 V, 2.5 V, 0 V to +10 V
1 MSPS throughput rate
8 analog input channels with channel sequencer
Single-ended true differential and pseudo differential
analog input capability
V
V
V
V
V
V
0
1
2
3
4
5
IN
IN
IN
13-BIT SUCCESSIVE
APPROXIMATION
ADC
I/P
MUX
T/H
IN
IN
IN
V
V
6
7
IN
IN
DOUT
SCLK
High analog input impedance
MUXOUT and ADCIN pins allow separate access to mux and ADC
Low power: 21 mW
CONTROL
LOGIC AND
REGISTERS
CHANNEL
SEQUENCER
CS
DIN
AD7329
Temperature indicator
V
AGND
V
DRIVE
SS
Full power signal bandwidth: 20 MHz
Internal 2.5 V reference
Figure 1.
High speed serial interface
iCMOS process technology
24-lead TSSOP package
Power-down modes
GENERAL DESCRIPTION
PRODUCT HIGHLIGHTS
The AD73291 is an 8-channel, 12-bit plus sign successive
approximation ADC designed on the iCMOS™ (industrial
CMOS) process. iCMOS is a process combining high voltage
CMOS and low voltage CMOS. It enables the development of
a wide range of high performance analog ICs capable of 33 V
operation in a footprint that no previous generation of high
voltage parts could achieve. Unlike analog ICs using conventional
CMOS processes, iCMOS components can accept bipolar input
signals while providing increased performance, dramatically
reduced power consumption, and reduced package size.
1. The AD7329 can accept true bipolar analog input signals,
± 1 ꢀ V, ± ± V, ± 2 . ± V, a n d ꢀ V to + 1 ꢀ V u n ip o l ar s i g n a l s .
2. The eight analog inputs can be configured as eight single-
ended inputs, four true differential input pairs, four pseudo
differential inputs, or seven pseudo differential inputs.
3. 1 MSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™-
compatible interface.
4. Low power, 21 mW, at 1 MSPS.
±. The MUXOUT± and ADCIN± pins allow for signal conditioning
of the mux output prior to entering the ADC.
The AD7329 can accept true bipolar analog input signals. The
AD7329 has four software-selectable input ranges: ±1ꢀ V, ±± V,
±2.± V, and ꢀ V to +1ꢀ V. Each analog input channel can be
independently programmed to one of the four input ranges.
The analog input channels on the AD7329 can be programmed
to be single-ended, true differential, or pseudo differential.
Table 1. Similar Devices
Device
Number
AD7328
AD7327
AD7324
AD7323
AD7322
AD7321
Throughput Rate
1000 kSPS
500 kSPS
Number of Channels
8
8
4
4
2
2
1000 kSPS
500 kSPS
The ADC contains a 2.± V internal reference. The AD7329 also
allows for external reference operation. If a 3 V reference is
applied to the REFIN/REFOUT pin, the AD7329 can accept a true
bipolar ±12 V analog input. The ADC has a high speed serial
interface that can operate at throughput rates up to 1 MSPS.
1000 kSPS
500 kSPS
1 Protected by U.S. Patent No. 6,731,232.
Rev. C
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