ADA4255ACPZ-R7 datasheet(1/64 Pages) AD

部品番号	ADA4255ACPZ-R7

部品情報	Zero Drift, High Voltage, Programmable Gain Instrumentation Amplifier with Charge Pump

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Data Sheet

ADA4255

Zero Drift, High Voltage, Programmable Gain

Instrumentation Amplifier with Charge Pump

Rev. 0

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FEATURES

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Integrated bipolar charge pump

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Simplified isolation requirements

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Wide input range on low voltage supplies

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Dedicated output amplifier supplies for ADC protection

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Low power: 83 mW (DVDD = 3 V, VDDCP = 5 V)

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36 precision gains from 1/16 V/V to 176 V/V

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Robust ±60 V protected 2:1 input multiplexer

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Excellent dc precision

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Low input offset voltage: ±14 μV maximum

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

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Gain calibration via internal memory

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Low gain drift: ±1 ppm/°C maximum

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High CMRR: 111 dB minimum, G = 1 V/V

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Low input bias current: ±1.5 nA maximum at TA = 25℃

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Integrated input EMI filtering

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7 GPIOx ports with special functions

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Sequential chip select mode

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Excitation current source

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SPI port with checksum (CRC) support

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Internal/external fault detection

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Compact 28-lead, 5 mm × 5 mm LFCSP

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

APPLICATIONS

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Universal process control front ends

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Data acquisition systems

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Test and measurement systems

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System power monitoring

GENERAL DESCRIPTION

The ADA4255 is a precision programmable gain instrumentation

amplifier (PGIA) with integrated bipolar charge pumps. With its inte-

grated charge pumps, the ADA4255 internally produces the high

voltage bipolar supplies needed to achieve a wide input voltage

range (38 V typical with VDDCP = 5 V) without lowering input

impedance. The charge pump topology of the ADA4255 allows

channels to be isolated with only low voltage components, reducing

complexity, size, and implementation time in industrial and process

control systems.

The zero drift PGIA topology of the ADA4255 self calibrates dc

errors and lower frequency 1/f noise, achieving excellent dc preci-

sion over the entire specified temperature range. The combination

of 36 precision gains ranging from 1/16 V/V to 176 V/V within the

ADA4255 and high voltage, high impedance inputs allow a wide

range of inputs to be scaled to the range of the analog-to-digital

converter (ADC). By integrating all gain setting and level shifting

resistors, the ADA4255 achieves excellent common-mode rejection

ratio (CMRR) performance (111 dB minimum at G = 1 V/V) and

extremely low gain drift (±1 ppm/℃ maximum). This high level of

precision maximizes dynamic range and greatly reduces calibration

requirements in many applications.

The ±60 V input protection, integrated electromagnetic interferance

(EMI) filtering and various safety features make the ADA4255 an

ideal choice for robust industrial systems. Seven general-purpose

input and output (GPIOx) pins, which can be configured to provide

various special functions, are included in the ADA4255. An excita-

tion current source output is available to bias sensors such as

resistance temperature detectors (RTDs).

The ADA4255 is specified over the −40°C to +105°C temperature

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

SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM

Figure 1. Simplified Functional Block Diagram

COMPANION PRODUCTS

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ADCs: AD4007, AD7768, AD7175-2, AD7124-4

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ADC Drivers: ADA4945-1, LTC6363

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Voltage References: ADR4550, ADR3450, LT6656

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Isolators: ADuM6421A Family, ADuM140D Family

同様の部品番号 - ADA4255ACPZ-R7

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