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ADA4254 PDF预览

ADA4254

更新时间: 2024-11-24 14:58:11
品牌 Logo 应用领域
亚德诺 - ADI 放大器仪表仪表放大器
页数 文件大小 规格书
59页 961K
描述
零点漂移、高电压、低功耗、可编程增益、仪表放大器

ADA4254 数据手册

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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  
Document Feedback  
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 are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700 ©2019–2020 Analog Devices, Inc. All rights reserved.  
Technical Support  
www.analog.com  
 
 
 
 
 

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