Datasheet AD8203 (Analog Devices)

High Common-Mode Voltage, Single-Supply Difference Amplifier Data Sheet AD8203 FEATURES FUNCTIONAL BLOCK DIAGRAMS High common-mode voltage range NC A1 A2 +VS −6 V to +30 V at a 5 V supply voltage 6 3 4 7 Operating temperature range: −40°C to +125°C AD8203 100k
Ω
Supply voltage range: 3.5 V to 12 V G =
×
7 G =
×
2 Low-pass filter (1-pole or 2-pole) +IN 8 +IN +IN Excellent ac and dc performance A1 A2 5 OUT –IN 1 –IN –IN ±1 mV voltage offset (8-lead SOIC) 10k
Ω
±1 ppm/°C typical gain drift 200k
Ω
200k
Ω
80 dB CMRR minimum dc to 10 kHz 10k
Ω
APPLICATIONS 2
05013-001
Transmission control NC = NO CONNECT GND Diesel injection control
Figure 1. Functional Block Diagram
Engine management Adaptive suspension control Vehicle dynamics control INDUCTIVE LOAD 5V CLAMP OUTPUT DIODE GENERAL DESCRIPTION +IN +V NC S OUT
The AD8203 is a single-supply difference amplifier for amplify-
BATTERY 14V
ing and low-pass filtering small differential voltages in the
4-TERM AD8203 SHUNT
presence of a large common-mode voltage (CMV). The input CMV range extends from −6 V to +30 V at a typical supply
–IN GND A1 A2 POWER
voltage of 5 V.
DEVICE
The AD8203 is available in packaged form. The MSOP and SOIC packages are specified over a wide temperature range, from −40°C to +125°C, making the AD8203 wel -suited for use
COMMON NC = NO CONNECT
05013-002 in many automotive platforms. Figure 2. High Line Current Sensor Automotive platforms demand precision components for better
POWER
system control. The AD8203 provides excellent ac and dc
DEVICE 5V
performance keeping errors to a minimum in the user’s system.
OUTPUT
Typical offset and gain drift in the SOIC package are 0.3 µV/°C and
+IN +V NC S OUT
1 ppm/°C, respectively. Typical offset and gain drift in the MSOP
BATTERY 14V 4-TERM
package are 2 μV/°C and 1 ppm/°C, respectively. The device also
AD8203 SHUNT
delivers a minimum CMRR of 80 dB from dc to 10 kHz.
–IN GND A1 A2
The AD8203 features an external y accessible 100 kΩ resistor at the output of the Preamp A1, which can be used for low-pass
CLAMP INDUCTIVE
filter applications and for establishing gains other than 14.
DIODE LOAD COMMON NC = NO CONNECT
05013-003 Figure 3. Low Line Current Sensor
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Document Outline Features Applications Functional Block Diagrams Revision History Specifications Single Supply Absolute Maximum Ratings ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Applications Current Sensing High Line, High Current Sensing Low Current Sensing Gain Adjustment Gains Less Than 14 Gains Greater Than 14 Gain Trim Internal Signal Overload Considerations Low-Pass Filtering High Line Current Sensing with LPF and Gain Adjustment Driving Charge Redistribution ADCs Outline Dimensions Ordering Guide