AD7324_15 Datasheet, PDF (1/37 Pages) Analog Devices – 4-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC

Data Sheet
4-Channel, Software-Selectable, True
Bipolar Input, 12-Bit Plus Sign ADC
AD7324
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
4 analog input channels with channel sequencer
Single-ended, true differential, and pseudo differential
analog input capability
High analog input impedance
Low power: 21 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
AD7324
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 AD7324¹ is a 4-channel, 12-bit plus sign, successive
approximation 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 conventional CMOS processes, iCMOS
components can accept bipolar input signals while providing
increased performance, dramatically reduced power consumption,
and reduced package size.
The AD7324 can accept true bipolar analog input signals. The
AD7324 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 AD7324 can be programmed
to be single-ended, true differential, or pseudo differential.
The ADC contains a 2.5 V internal reference. The AD7324 also
allows for external reference operation. If a 3 V reference is
applied to the REFIN/OUT pin, the AD7324 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 1 MSPS.
1_{Protected by U.S. Patent No. 6,731,232.}
Rev. B
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
PRODUCT HIGHLIGHTS
1. The AD7324 can accept true bipolar analog input signals,
±10 V, ±5 V, ±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. 1 MSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™-
compatible interface.
4. Low power, 31 mW maximum, at 1 MSPS throughput rate.
5. Channel sequencer.
Table 1. Similar Products Selection Table
Device Throughput
Number Rate
Number of bits
AD7329 1000 kSPS
12-bit plus sign
AD7328 1000 kSPS
12-bit plus sign
AD7327 500 kSPS
12-bit plus sign
AD7323 500 kSPS
12-bit plus sign
AD7322 1000 kSPS
12-bit plus sign
AD7321 500 kSPS
12-bit plus sign
Number of
Channels
8
8
8
4
2
2
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] ©2005–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com