AD7922ARMZ Analog Devices Inc, AD7922ARMZ Datasheet

AD7922ARMZ

Manufacturer Part Number

AD7922ARMZ

Description

IC ADC 12BIT 1MSPS DUAL 8-MSOP

Manufacturer

Analog Devices Inc

Datasheet

1.AD7922ARM-REEL7.pdf (32 pages)

Specifications of AD7922ARMZ

Data Interface

DSP, MICROWIRE™, QSPI™, Serial, SPI™

Operating Temperature

-40°C ~ 85°C

Number Of Bits

Sampling Rate (per Second)

Number Of Converters

Power Dissipation (max)

20mW

Voltage Supply Source

Single Supply

Mounting Type

Surface Mount

Package / Case

8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Resolution (bits)

12bit

Input Channel Type

Single Ended

Supply Voltage Range - Analogue

2.35V To 5.25V

Supply Current

4mA

No. Of Pins

Sampling Rate

1MSPS

Rohs Compliant

Yes

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

For Use With

EVAL-AD7922CBZ - BOARD EVAL FOR AD7922

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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AD7922ARMZ-REEL7

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FEATURES

Fast throughput rate: 1 MSPS

Specified for V

Low power:

Wide input bandwidth:

Flexible power/serial clock speed management

No pipeline delays

High speed serial interface:

Standby mode: 1 µA maximum

Daisy-chain mode

8-lead TSOT package

8-lead MSOP package

APPLICATIONS

Battery-powered systems:

Instrumentation and control systems

Data acquisition systems

High speed modems

Optical sensors

GENERAL DESCRIPTION

The AD7912/AD7922

power, 2-channel successive approximation ADCs, respectively.

The parts operate from a single 2.35 V to 5.25 V power supply

and feature throughput rates of up to 1 MSPS. The parts contain

a low noise, wide bandwidth track-and-hold amplifier, which

can handle input frequencies in excess of 6 MHz.

The conversion process and data acquisition are controlled

using CS and the serial clock, allowing the devices to interface

with microprocessors or DSPs. The conversion rate is

determined by the SCLK signal. The input signal is sampled on

the falling edge of CS and the conversion is also initiated at this

point. The channel to be converted is selected through the DIN

pin, and the mode of operation is controlled by CS . The serial

data stream from the DOUT pin has a channel identifier bit and

mode identifier bit, which provide information about the

converted channel and the current mode of operation.

Rev. 0

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.

4.8 mW typ at 1 MSPS with 3 V supplies

15.5mW typ at 1 MSPS with 5 V supplies

71 dB minimum SNR at 100 kHz input frequency

SPI®/QSPI™/MICROWIRE™/DSP compatible

Personal digital assistants

Medical instruments

Mobile communications

of 2.35 V to 5.25 V

are 10-bit and 12-bit, high speed, low

Several AD7912/AD7922 can be connected together in a daisy

chain. The AD7912/AD7922 feature a daisy-chain mode that

allows the user to read the conversion results from the ADCs

contained in the chain. The AD7912/AD7922 use advanced

design techniques to achieve very low power dissipation at high

throughput rates. The reference for the part is taken internally

from V

the ADC.

PRODUCT HIGHLIGHTS

1. 2-channel, 1 MSPS, 10-/12-bit ADCs in TSOT package.

2. High throughput with low power consumption.

3. Flexible power/serial clock speed management.

4. Daisy-chain mode.

5. No pipeline delay.

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

Tel: 781.329.4700

Fax: 781.326.8703

Protected by U.S. Patent Number 6,681,332.

The conversion rate is determined by the serial clock. The

parts also feature a power-down mode to maximize power

efficiency at lower throughput rates. Average power

consumption is reduced when the power-down mode is

used while not converting. Current consumption is 1 µA

maximum and 50 nA typically when in power-down mode.

The parts feature a standard successive approximation ADC

with accurate control of the sampling instant via a CS input

and once-off conversion control.

IN0

IN1

2-Channel, 2.35 V to 5.25 V,

, thereby allowing the widest dynamic input range to

AD7912/AD7922

FUNCTIONAL BLOCK DIAGRAM

1 MSPS, 10-/12-Bit ADCs

MUX

T/H

Figure 1.

AD7912/AD7922

APPROXIMATION

CONTROL LOGIC

SUCCESSIVE

10-/12-BIT

ADC

GND

www.analog.com

SCLK

DOUT

DIN

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