AD7327 Analog Devices Data Sheet Manual

500 k SPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC

AD7327 FEATURES FUNCTIONAL BLOCK DIAGRAM

12-bit plus sign SAR ADC VDD REFIN/OUT VCC

True bipolar input ranges

AD7327

Software-selectable input ranges

±10 V, ±5 V, ±2.5 V, 0 V to +10 V 2.5V

VIN1 VREF

13-BIT

500 k SPS throughput rate

VIN2 I/P SUCCESSIVE

MUX T/H

VIN3 APPROXIMATION

Eight analog input channels with channel sequencer

Single-ended, true differential, and pseudo differential

analog input capability VIN6 TEMPERATURE INDICATOR

High analog input impedance

Low power: 17 m W DOUT CONTROL LOGIC SCLK

Temperature indicator AND REGISTERS

CHANNEL Full power signal bandwidth: 22 MHz SEQUENCER DIN

Internal 2.5 V reference

VDRIVE

High speed serial interface Power-down modes AGND VSS DGND 20-lead TSSOP package

Figure 1.

i CMOS™ process technology

GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD73271 is an 8-channel, 12-bit plus sign successive 1. The AD7327 can accept true bipolar analog input signals,

approximation ADC designed on the i CMOS (industrial www.BDTIC.com/ADI ±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals.

CMOS) process. i CMOS is a process combining high voltage

2. The eight analog inputs can be configured as eight single-

silicon with submicron CMOS and complementary bipolar

ended inputs, four true differential inputs, four pseudo

technologies. It enables the development of a wide range of high

differential inputs, or seven pseudo differential inputs.

performance analog ICs capable of 33 V operation in a footprint that no previous generation of high voltage parts could achieve.

3. 500 k SPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™-

Unlike analog ICs using conventional CMOS processes, i CMOS

compatible interface.

components can accept bipolar input signals while providing

increased performance, dramatically reduced power 4. Low power, 17 m W, at a maximum throughput rate of consumption, and reduced package size. 500 k SPS.

The AD7327 can accept true bipolar analog input signals. The 5. Channel sequencer.

AD7327 has four software-selectable input ranges, ±10 V, ±5 V,

Table 1. Similar Devices

±2.5 V, and 0 V to +10 V. Each analog input channel can be

Device Throughput Number of

independently programmed to one of the four input ranges. 1-

Number Rate Number of bits Channels

The analog input channels on the AD7327 can be programmed

AD7329 1000 k SPS 12-bit plus sign 8

to be single-ended, true differential, or pseudo differential.

AD7328 1000 k SPS 12-bit plus sign 8 AD7324 1000 k SPS 12-bit plus sign 4

The ADC contains a 2.5 V internal reference. The AD7327 also

AD7323 500 k SPS 12-bit plus sign 4

allows for external reference operation. If a 3 V reference is

AD7322 1000 k SPS 12-bit plus sign 2

applied to the REFIN/OUT pin, the AD7327 can accept a true

AD7321 500 k SPS 12-bit plus sign 2

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

1 Protected by U.S. Patent No. 6,731,232.

up to 500 k SPS.

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