AD7329 Datasheet, PDF (1/40 Pages) Analog Devices – 1 MSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC

1 MSPS, 8-Channel, Software-Selectable,
True Bipolar Input, 12-Bit Plus Sign ADC
AD7329
FEATURES
12-bit plus sign SAR ADC
True bipolar input ranges
Software-selectable input ranges
±10 V, ±5 V, ±2.5 V, 0 V to +10 V
1 MSPS throughput rate
Eight analog input channels with channel sequencer
Single-ended true differential and pseudo differential
analog input capability
High analog input impedance
MUXOUT and ADCIN pins allow separate access to mux and ADC
Low power: 21 mW
Temperature indicator
Full power signal bandwidth: 20 MHz
Internal 2.5 V reference
High speed serial interface
iCMOS™ process technology
24-lead TSSOP package
Power-down modes
GENERAL DESCRIPTION
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.
The AD7329 can accept true bipolar analog input signals. The
AD7329 has four software-selectable input ranges, ±10 V, ±5 V,
±2.5 V, and 0 V to +10 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.
The ADC contains a 2.5 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.
Rev. 0
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FUNCTIONAL BLOCK DIAGRAM
MUX_OUT+ MUX_OUT– ADC_IN– ADC_IN+ V_DD
REF_IN/REF_OUT V_CC
V_IN0
V_IN1
V_IN2
V_IN3
V_IN4
V_IN5
V_IN6
V_IN7
I/P
MUX
CHANNEL
SEQUENCER
AD7329
2.5V
VREF
13-BIT SUCCESSIVE
T/H
APPROXIMATION
ADC
V_SS
Figure 1.
CONTROL
LOGIC AND
REGISTERS
AGND
V_DRIVE
DOUT
SCLK
CS
DIN
PRODUCT HIGHLIGHTS
1. The AD7329 can accept true bipolar analog input signals,
±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals.
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.
5. MUXOUT and ADCIN pins allow for signal conditioning of
the mux output prior to entering the ADC.
Table 1. Similar Devices
Device
Number Throughput Rate
AD7328 1000 kSPS
AD7327 500 kSPS
AD7324 1000 kSPS
AD7323 500 kSPS
AD7322 1000 kSPS
AD7321 500 kSPS
Number of Channels
8
8
4
4
2
2
1 _{Protected by U.S. Patent No. 6,731,232.}
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