Zero Drift, High Voltage, Low Power,
Programmable Gain Instrumentation Amplifier
Data Sheet
ADA4254
FEATURES
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM
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
VDDH
EXCITATION
CURRENTS
ADA4254
IOUT_HV
AVDD
IOUT_LV
+
–
R
OUT
–
+
–OUT
VOCM
+OUT
+IN1
–IN1
+IN2
–IN2
R
IN
+
–
–
+
R
OUT
AVSS
Integrated input EMI filtering
DIGITAL CONTROL
Wide input supply range: 5 V to 28 V
Dedicated output amplifier supplies
7 GPIO ports with special functions
Sequential chip select mode
DVDD
DVSS
7 × GPIO SPI INTERFACE
VSSH
External multiplexer control
Excitation current sources
Figure 1.
SPI port with checksum (CRC) support
Internal fault detection
Wire break test currents
The input multiplexer provides 6ꢀ 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.
On-chip test multiplexer
28-lead, 5 mm × 5 mm LFCSP, 24-lead TSSOP
Specified temperature range: −40°C to +105°C
APPLICATIONS
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.
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.
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 −4ꢀ°C to +1ꢀ5°C temperature
range and is offered in a compact 5 mm × 5 mm, 28-lead LFCSP
and a 24-lead TSSOP.
COMPANION PRODUCTS
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.
ADCs: AD4007, AD7768, AD7175-2
ADC Drivers: ADA4945-1, LTC6363
Voltage References: ADR4550, ADR3450, LT6656
Rev. B
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Devices. Trademarks and registeredtrademarks are the property of their respective owners.
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