EVAL-AD7328CB(2004) データシートの表示（PDF） - Analog Devices

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EVAL-AD7328CB
(Rev.:2004)

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

Analog Devices 

8-Channel, Software Selectable True bipolar

Input, 12-Bit Plus Sign ADC

Preliminary Technical Data

AD7328*

FEATURES

• 12-Bit plus Sign SAR ADC

• True Bipolar Input Ranges

• Software Selectable Input Ranges

± 10V, ± 5V, ± 2.5V, 0 to 10V

• 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

• Low Power:- 26 mW max

• Full Power Signal Bandwidth: 7 MHz

• Internal 2.5 V Reference

• High Speed Serial Interface

• Power Down Modes

• 20-Lead TSSOP package

• iCMOSTM Process Technology

• For four and two channel equivalent devices see

AD7324 and AD7322 respectively.

GENERAL DESCRIPTION

The AD7328 is an 8-Channel, 12-Bit plus Sign Successive

Approximation ADC. The ADC has a high speed serial interface

that can operate at throughput rates up to 1 Msps.

The AD7328 can accept true bipolar Analog Input signals. The

AD7328 has four software selectable inputs Ranges, ±10V, ±5V,

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

independently programmed to one of the four input ranges.

The Analog input channels on the AD7328 can be programmed

to be Single-Ended, true Differential or Pseudo Differential.

The ADC contains a 2.5V Internal reference. The AD7328 also

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

applied the REF IN/OUT pin the AD7328 can accept a true Bipolar

±12V Analog Input. VDD and VSS supplies of ±12V are required

for the ±12V Input Range.

FUNCTIONAL BLOCK DIAGRAM

VDD

REFIN/OUT

VCC

Vin0

Vin1

Vin2

Vin3

Vin4

Vin5

Vin6

Vin7

I/P

MUX

CHANNEL

SEQUENCER

2.5V

VREF

T/H

13-BIT SUCCESSIVE

APPROXIMATION

ADC

CONTROL

LOGIC &

REGISTERS

DOUT

SC LK

+5

DIN

VDRIVE

AGND

VSS

Figure 1.

DGND

PRODUCT HIGHLIGHTS

1. The AD7328 can accept True Bipolar Analog Input signals,

±10V, ±5V, ±2.5V and 0 to 10V unipolar signals.

2. The Eight Analog Inputs can be configured as 8 Single-Ended

inputs, 4 True Differential, 4 Pseudo Differential or 7 Pseudo

Differential Inputs.

3. The AD7328 features a High Speed Serial Interface.

Throughput Rates up to 1 MSPS can be achieved.

4. Low Power, 26 mW at maximum throughput rate of 1 MSPS.

5. Channel Sequencer..

Device Number

AD7324

AD7322

Number of bits

12 bit + Sign

12 bit + Sign

Number of Channels

4

2

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

iCMOSTM Process Technology

For analog systems designers within industrial/instrumentation equipment OEMs who need high performance ICs at higher-voltage levels, iCMOS is a technology platform

that enables the development of analog ICs capable of 30V and operating at +/- 15V supplies while allowing dramatic reductions in power consumption and package size, and

increased AC and DC performance.

Rev. PrK

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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 companies.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

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Fax: 781.326.8703 © 2004 Analog Devices, Inc. All rights reserved.

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