AD7323_15 Datasheet, PDF (1/37 Pages) Analog Devices – 500 kSPS, 4-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC

Data Sheet
500 kSPS, 4-Channel, Software-Selectable,
True Bipolar Input, 12-Bit Plus Sign ADC
AD7323
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
500 kSPS throughput rate
Four analog input channels with channel sequencer
Single-ended, true differential, and pseudo differential
analog input capability
High analog input impedance
Low power: 18 mW
Full power signal bandwidth: 22 MHz
Internal 2.5 V reference
High speed serial interface
Power-down modes
16-lead TSSOP package
iCMOS process technology
FUNCTIONAL BLOCK DIAGRAM
V_DD
REFIN/OUT V_CC
AD7323
V_IN0
V_IN1
V_IN2
V_IN3
I/P
MUX
2.5V
VREF
T/H
13-BIT
SUCCESSIVE
APPROXIMATION
ADC
CHANNEL
SEQUENCER
AGND
CONTROL LOGIC
AND REGISTERS
V_SS
DGND
Figure 1.
DOUT
SCLK
CS
DIN
V_DRIVE
GENERAL DESCRIPTION
The AD7323¹ is a 4-channel, 12-bit plus sign successive
approximation analog-to-digital converter (ADC) designed on
the iCMOS™ (industrial CMOS) process. iCMOS is a process
combining high voltage silicon with submicron CMOS and
complementary bipolar technologies. 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 conven-
tional CMOS processes, iCMOS components can accept bipolar
input signals while providing increased performance, dramati-
cally reduced power consumption, and reduced package size.
The AD7323 can accept true bipolar analog input signals. The
AD7323 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 AD7323 can be programmed
to be single-ended, true differential, or pseudo differential.
The ADC contains a 2.5 V internal reference. The AD7323 also
allows for external reference operation. If a 3 V reference is
applied to the REFIN/OUT pin, the AD7323 can accept a true
bipolar ±12 V analog input. Minimum ±12 V VDD and VSS
supplies are required for the ±12 V input range. The ADC has a
high speed serial interface that can operate at throughput rates
up to 500 kSPS.
1 _{Protected by U.S. Patent No. 6,731,232.}
Rev. B
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PRODUCT HIGHLIGHTS
1. The AD7323 can accept true bipolar analog input signals,
±10 V, ±5 V, and ±2.5 V, and 0 V to +10 V unipolar signals.
2. The four analog inputs can be configured as four single-
ended inputs, two true differential input pairs, two pseudo
differential inputs, or three pseudo differential inputs.
3. 500 kSPS serial interface. SPI-/QSPI™-/DSP-/MICROWIRE™-
compatible interface.
4. Low power, 18 mW, at a maximum throughput rate of
500 kSPS.
5. Channel sequencer.
Table 1. Similar Devices
Device Throughput
Number Rate
AD7329 1000 kSPS
AD7328 1000 kSPS
AD7327 500 kSPS
AD7324 1000 kSPS
AD7322 1000 kSPS
AD7321 500 kSPS
Number of bits
12-bit plus sign
12-bit plus sign
12-bit plus sign
12-bit plus sign
12-bit plus sign
12-bit plus sign
Number of
Channels
8
8
8
4
2
2
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