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| 型号： | AD7322BRU |
| 厂商： | Atmel Corp. |
| 英文描述： | Software Selectable True Bipolar Input, 2-Channel, 12-Bit Plus Sign ADC |
| 中文描述： | 软件可选真双极性输入，2通道，12位ADC的加号 |
| 文件页数： | 1/18页 |
| 文件大小： | 901K |
| 代理商： | AD7322BRU |
Software Selectable True Bipolar Input,
2-Channel, 12-Bit Plus Sign ADC
Preliminary Technical Data
AD7322*
FEATURES
12-Bit Plus Sign SAR ADC
True Bipolar Analog Inputs
Software Selectable Input Ranges
± 10V, ± 5V, ± 2.5V, 0 to 10V
Two Analog Inputs with Channel Sequencer
Single Ended, True Differential and Pseudo Differential
Capability.
High Analog Input Impedance
Low Power:- 6 mW
Full Power Signal Bandwidth: >13 MHz
Internal 2.5 V Reference
High Speed Serial Interface
Power Down Modes
14-Lead TSSOP
For 8 and 4 channel equivalent devices see AD7328 and
AD7324 respectively.
GENERAL DESCRIPTION
The AD7322 is a 2-Channel, 12-Bit Plus Sign, 1 MSPS
Successive Approximation ADC. The ADC has a high speed
serial interface that can operate at throughput rates up to 1
MSPS.
The AD7322 can handle True Bipolar Analog input signals. The
Bipolar ranges are software selectable by programming the on
board Range Register. Bipolar input ranges include ± 10V, ± 5V,
± 2.5V. The AD7322 can also handle a 0 to 10 V uniploar input
range, which is also software selectable. Each analog input
channel can be independently programmed to one of the input
ranges by setting the appropriate bits in the Range Register.
The Analog Input Channels can be configured as Single-Ended,
Fully Differential or Pseudo Differential. Dedicated Control
Register bits are used to configure the Analog inputs. The
AD7322 contains a Channel Sequencer, allowing automatic
conversions between each analog input channel.
The ADC contains a 2.5V Internal reference. The AD7322 also
allows for external Reference operation. If a 3V external
reference is applied to the REFIN/OUT pin, the ADC can
handle a True Bipolar ± 12 V Analog input range. Minimum
VDD and VSS supplies of ± 12V are required for this ± 12 V input
range.
* Patent Pending
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
The Serial clock frequency, SCLK, applied to the ADC will
determine the maximum throughput rate the ADC can operate
at. The SCLK signal is used as the conversion clock and also to
transfer data to and from the ADC. The Serial interface is
SPITM, QSPITM, MICROWIRETM and DSP compatible.
The AD7322 offers power down modes to reduce the power
consumption of the ADC at lower throughput rates.
PRODUCT HIGHLIGHTS
1. The AD7322 can accept True Bipolar Analog Input signals,
±10V, ±5V, ±2.5V and 0 to 10V unipolar signals.
2. The Two Analog Inputs can be configured as Two Single-
Ended inputs, One True Differential or One Pseudo Differential
Input. The AD7322 has high Impedance Analog Inputs.
3. The AD7322 features a High Speed Serial Interface.
Throughput Rates up to 1 MSPS can be achieved on the
AD7322.
4. Low Power, 12 mW at maximum throughput rate of 1 MSPS.
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 companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
2004 Analog Devices, Inc. All rights reserved.
Rev. PrE
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