Datasheet > AD7890BRZ-2

AD7890BRZ-2

更新时间： 2024-11-16 15:27:39

品牌	Logo	应用领域
亚德诺 - ADI		光电二极管转换器
页数	文件大小	规格书
29页	395K
描述
LC2MOS 8-Channel, 12-Bit Serial Data Acquisition System

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数据手册
替代型号

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AD7890BRZ-2 数据手册

LC²MOS 8-Channel, 12-Bit

Serial Data Acquisition System

AD7890

FUNCTIONAL BLOCK DIAGRAM

FEATURES

MUX SHA REF OUT/

Fast 12-bit ADC with 5.9 μs conversion time

Eight single-ended analog input channels

Selection of input ranges:

10 V for AD7890-10

0 V to 4.096 V for AD7890-4

0 V to 2.5 V for AD7890-2

Allows separate access to multiplexer and ADC

On-chip track/hold amplifier

OUT IN

REF IN

SIGNAL

2kΩ

IN1

2.5V

SCALING

REFERENCE

SIGNAL

SCALING

IN2

SIGNAL

SCALING

IN3

EXT

SIGNAL

SCALING

IN4

MUX

SIGNAL

SCALING

On-chip reference

IN5

IN6

IN7

IN8

CONVST

High-speed, flexible, serial interface

Single supply, low-power operation (50 mW maximum)

Power-down mode (75 μW typ)

SIGNAL

SCALING

12-BIT

ADC

SIGNAL

SCALING

TRACK/HOLD

SIGNAL

SCALING

GENERAL DESCRIPTION

OUTPUT/CONTROL REGISTER

AD7890

The AD7890 is an 8-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).

CLOCK

AGND AGND DGND CLK

SCLK TFS RFS DATA DATA SMODE

OUT IN

NO SCALING ON AD7890-2

Figure 1.

Power dissipation in normal mode is low at 30 mW typical 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, Inc.’s 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 ceramic dual-in-line package or in

a 24-lead small outline package (SOIC_W).

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.

PRODUCT HIGHLIGHTS

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,

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

high speed logic ensures easy interfacing to serial ports on

microcontrollers and digital signal processors.

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

The AD7890 is a complete monolithic ADC combining an

8-channel multiplexer, 12-bit ADC, 2.5 V reference, and a

track/hold amplifier on a single chip.

2. Separate Access to Multiplexer and ADC.

The AD7890 provides access to the output of the

multiplexer allowing one antialiasing filter for 8 channels—

a considerable savings over the 8 antialiasing filters required if

the multiplexer is internally connected to the ADC.

In addition to the traditional dc accuracy specifications such as

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

specified for dynamic performance parameters including

harmonic distortion and signal-to-noise ratio.

3. High Speed Serial Interface.

The part provides a high speed serial interface for easy

connection to serial ports of microcontrollers and DSP

processors.

Rev. C

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 registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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AD7890BRZ-2 替代型号

型号	品牌	替代类型	描述	数据表
AD7890ARZ-2REEL	ADI	完全替代	8-Channel, 12-Bit Serial Data Acquisition System
AD7890ARZ-2	ADI	完全替代	LC2MOS 8-Channel, 12-Bit Serial Data Acquisition System
AD7890BR-10	ADI	完全替代	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System

与AD7890BRZ-2相关器件

型号	品牌	获取价格	描述	数据表
AD7890BRZ-2REEL	ADI	获取价格	8-Channel, 12-Bit Serial Data Acquisition System
AD7890BRZ-4	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO24, LEAD FREE, MS-013AD, SOIC-24
AD7890BRZ-4	ADI	获取价格	8-Channel, 12-Bit Serial Data Acquisition System
AD7890BRZ-4REEL	ADI	获取价格	8-Channel, 12-Bit Serial Data Acquisition System
AD7890SQ	ETC	获取价格	LC 2 MOS 8-Channel 12-Bit Serial Data Acquisition System(191.20 k)
AD7890SQ-10	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890SQ-10QML	ETC	获取价格	STANDARD MICROCIRCUIT DRAWING
AD7890SQ-2	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890SQ-4	ADI	获取价格	LC2MOS 8-Channel, 12-Bit Serial, Data Acquisition System
AD7890SQ-4	ROCHESTER	获取价格	8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, CDIP24, 0.300 INCH, CERDIP-24

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