ADA4254ACPZ-R7 datasheet(1/59 Pages) AD

部件名	ADA4254ACPZ-R7

功能描述	Zero Drift, High Voltage, Low Power, Programmable Gain Instrumentation Amplifier

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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Zero Drift, High Voltage, Low Power,

Programmable Gain Instrumentation

Amplifier

Data Sheet

ADA4254

Rev. B

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FEATURES

Optimized for ADC synchronization

Low power: 22 mW (±12 V supplies)

12 binary gain steps from 1/16 V/V to 128 V/V

3 scaling gains: 1 V/V, 1.25 V/V, and 1.375 V/V

±60 V protected input multiplexer

Excellent dc precision

Low input offset voltage: ±14 μV maximum

Low input offset voltage drift: ±0.08 μV/°C maximum

Gain calibration via ROM

Low gain drift: ±1 ppm/°C maximum

High CMRR: 116 dB minimum, G = 1 V/V

Low input bias current: ±1.5 nA maximum

High input impedance

Integrated input EMI filtering

Wide input supply range: ±5 V to ±28 V

Dedicated output amplifier supplies

7 GPIO ports with special functions

Sequential chip select mode

External multiplexer control

Excitation current sources

SPI port with checksum (CRC) support

Internal fault detection

Wire break test currents

On-chip test multiplexer

28-lead, 5 mm × 5 mm LFCSP, 24-lead TSSOP

Specified temperature range: −40°C to +105°C

APPLICATIONS

Universal process control front ends

Data acquisition systems

Test and measurement systems

GENERAL DESCRIPTION

The ADA4254 is a zero drift, high voltage, low power

programmable gain instrumentation amplifier (PGIA) designed

for process control and industrial applications. The ADA4254

features 12 binary weighted gains ranging from 1/16 V/V to

128 V/V and three scaling gain options of 1 V/V, 1.25 V/V, and

1.375 V/V, resulting in 36 possible gain settings. The power

consumption of the ADA4254 is a mere 22 mW, making the

device an excellent choice for industrial systems that demand

precision, robustness, and low power.

The zero drift amplifier topology of the ADA4254 self calibrates

dc errors and low frequency 1/f noise, achieving excellent dc

precision over the entire specified temperature range. This high

level of precision maximizes dynamic range and greatly reduces

calibration requirements in many applications.

SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM

ADA4254

+IN1

–IN1

IOUT_HV

IOUT_LV

+IN2

–IN2

EXCITATION

CURRENTS

RIN

ROUT

AVDD

–OUT

+

–

+

–

+

–

VOCM

+OUT

AVSS

VDDH

VSSH

DIGITAL CONTROL

7 × GPIO

SPI INTERFACE

DVDD

DVSS

Figure 1.

The input multiplexer provides ±60 V protection to the high

impedance inputs of the amplifier, while providing the

capability to switch between two input sources. In addition,

integrated electromagnetic interference (EMI) filters block

harsh RF noise from the sensitive inputs of the amplifier.

Various safety features on the ADA4254 detect both internal

and external faults. The serial port interface (SPI) supports

cyclical redundancy check (CRC) error detection to ensure

robust communication. These safety features ease system safety

integrity level (SIL) certification.

Seven general-purpose input/output (GPIO) pins, which can be

configured to provide various special functions, are included in

the ADA4254. An excitation current source output is available

to bias sensors such as resistance temperature detectors (RTDs).

The ADA4254 is specified over the −40°C to +105°C temperature

range and is offered in a compact 5 mm × 5 mm, 28-lead LFCSP

and a 24-lead TSSOP.

COMPANION PRODUCTS

ADCs: AD4007, AD7768, AD7175-2

ADC Drivers: ADA4945-1, LTC6363

Voltage References: ADR4550, ADR3450, LT6656

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