Datasheet > AD7890BN

AD7890BN

更新时间： 2024-11-15 23:27:35

品牌	Logo	应用领域
其他 - ETC		转换器光电二极管
页数	文件大小	规格书
20页	191K
描述
LC 2 MOS 8-Channel 12-Bit Serial Data Acquisition System(191.20 k)

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AD7890BN 数据手册

LC²MOS 8-Channel, 12-Bit

Serial, Data Acquisition System

AD7890

FUNCTIONAL BLOCK DIAGRAM

FEATURES

Fast 12-Bit ADC with 5.9 ␮s Conversion Time

Eight Single-Ended Analog Input Channels

Selection of Input Ranges:

MUX SHA REF OUT/

OUT IN

REF IN

؎10 V for AD7890-10

0 V to 4.096 V for AD7890-4

0 V to 2.5 V for AD7890-2

SIGNAL

2k⍀

2.5V

REFERENCE

IN1

SCALING*

SIGNAL

SCALING*

IN2

Allows Separate Access to Multiplexer and ADC

On-Chip Track/Hold Amplifier

On-Chip Reference

High-Speed, Flexible, Serial Interface

Single Supply, Low-Power Operation (50 mW Max)

Power-Down Mode (75 ␮W Typ)

SIGNAL

IN3

SCALING*

EXT

SIGNAL

SCALING*

IN4

MUX

SIGNAL

SCALING*

IN5

CONVST

SIGNAL

SCALING*

IN6

12-BIT

ADC

SIGNAL

SCALING*

IN7

SIGNAL

SCALING*

TRACK/HOLD

OUTPUT/CONTROL REGISTER

IN8

GENERAL DESCRIPTION

AD7890

CLOCK

The AD7890 is an eight-channel 12-bit data acquisition system.

The part contains an input multiplexer, an on-chip track/hold

amplifier, a high-speed 12-bit ADC, a 2.5 V reference and a

high speed, serial interface. The part operates from a single 5 V

supply and accepts an analog input range of 10 V (AD7890-10),

0 V to 4.096 V (AD7890-4) and 0 V to 2.5 V (AD7890-2).

AGND

DGND

SCLK

TFS

RFS

SMODE

CLK

DATA DATA

OUT IN

*NO SCALING ON AD7890-2

Power dissipation in normal mode is low at 30 mW typ and the

part can be placed in a standby (power-down) mode if it is not

required to perform conversions. The AD7890 is fabricated in

Analog Devices’ Linear Compatible CMOS (LC²MOS) process,

a mixed technology process that combines precision bipolar

circuits with low power CMOS logic. The part is available in a

24-lead, 0.3" wide, plastic or hermetic dual-in-line package or in

a 24-lead small outline package (SOIC).

The multiplexer on the part is independently accessible. This

allows the user to insert an antialiasing filter or signal conditioning,

if required, between the multiplexer and the ADC. This means

that one antialiasing filter can be used for all eight channels.

Connection of an external capacitor allows the user to adjust the

time given to the multiplexer settling to include any external

delays in the filter or signal conditioning circuitry.

Output data from the AD7890 is provided via a high-speed

bidirectional serial interface port. The part contains an on-chip

control register, allowing control of channel selection, conver-

sion start and power-down via the serial port. Versatile, high

speed logic ensures easy interfacing to serial ports on microcon-

trollers and digital signal processors.

PRODUCT HIGHLIGHTS

1. Complete 12-Bit Data Acquisition System-on-a-Chip

The AD7890 is a complete monolithic ADC combining an

eight-channel multiplexer, 12-bit ADC, 2.5 V reference and

a track/hold amplifier on a single chip.

In addition to the traditional dc accuracy specifications such as

linearity, full-scale and offset errors, the AD7890 is also speci-

fied for dynamic performance parameters including harmonic

distortion and signal-to-noise ratio.

2. Separate Access to Multiplexer and ADC

The AD7890 provides access to the output of the multiplexer

allowing one antialiasing filter for eight channels—a consid-

erable saving over the eight antialiasing filters required if the

multiplexer was internally connected to the ADC.

3. High-Speed Serial Interface

The part provides a high-speed serial interface for easy con-

nection to serial ports of microcontrollers and DSP processors.

REV. B

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

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

Tel: 781/329-4700

Fax: 781/326-8703

World Wide Web Site: http://www.analog.com

12 3 4 5 6 7...20

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与AD7890BN相关器件

型号	品牌	获取价格	描述	数据表
AD7890BN-10	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890BN-10	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDIP24, 0.300 INCH, PLASTIC, MS-001, DI
AD7890BN-2	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890BN-4	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890BN-4	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDIP24, 0.300 INCH, PLASTIC, MS-001, DI
AD7890BNZ-10	ADI	获取价格	8-Channel, 12-Bit Serial Data Acquisition System
AD7890BNZ-10	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDIP24, 0.300 INCH, LEAD FREE, PLASTIC,
AD7890BNZ-2	ADI	获取价格	8-Channel, 12-Bit Serial Data Acquisition System
AD7890BNZ-4	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDIP24, 0.300 INCH, LEAD FREE, PLASTIC,
AD7890BNZ-4	ADI	获取价格	8-Channel, 12-Bit Serial Data Acquisition System

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