Datasheet

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Dual, High Voltage

Current Shunt Monitor

Data Sheet

AD8213

Rev. C Document Feedback

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FEATURES

±4000 V HBM ESD

High common-mode voltage range

−2 V to +65 V operating

−3 V to +68 V survival

Buffered output voltage

Wide operating temperature range

−40°C to +125°C for Y grade

−40°C to +150°C for H grade

Excellent ac and dc performance

3 µV/°C typical offset drift

−10 ppm/°C typical gain drift

120 dB typical CMRR at dc

APPLICATIONS

High-side current sensing

Motor controls

Transmission controls

Diesel injection controls

Engine management

Suspension controls

Vehicle dynamic controls

DC-to-DC converters

FUNCTIONAL BLOCK DIAGRAM

G = +20

–IN2

+IN2

PROPRIETARY

OFFSET

CIRCUITRY

CF2

OUT2

G = +20

–IN1

+IN1

PROPRIETARY

OFFSET

CIRCUITRY

CF1

GND

OUT1

V+

AD8213

06639-001

Figure 1.

GENERAL DESCRIPTION

The AD8213 is a dual-channel, precision current sense amplifier. It

features a set gain of 20 V/V, with a maximum ±0.5% gain error

over the entire temperature range. The buffered output voltage

directly interfaces with any typical converter. Excellent common-

mode rejection from −2 V to +65 V, is independent of the 5 V

supply. The AD8213 performs unidirectional current measure-

ments across a shunt resistor in a variety of industrial and

automotive applications, such as motor control, solenoid

control, or battery management.

Special circuitry is devoted to output linearity being maintained

throughout the input differential voltage range of 0 mV to 250 m V,

regardless of the common-mode voltage present. The AD8213

also features additional pins that allow the user to low-pass filter

the input signal before amplifying, via an external capacitor to

ground. The AD8213 has an operating temperature range of

−40°C to +125°C for the Y grade, −40°C to +150°C for the H grade

and is offered in a small 10-lead MSOP package.

Summary of content (16 pages)

PAGE 1
Dual, High Voltage Current Shunt Monitor AD8213 Data Sheet FUNCTIONAL BLOCK DIAGRAM +IN2 +IN1 –IN2 ±4000 V HBM ESD High common-mode voltage range −2 V to +65 V operating −3 V to +68 V survival Buffered output voltage Wide operating temperature range −40°C to +125°C for Y grade −40°C to +150°C for H grade Excellent ac and dc performance 3 µV/°C typical offset drift −10 ppm/°C typical gain drift 120 dB typical CMRR at dc –IN1 A1 A2 V+ PROPRIETARY OFFSET CIRCUITRY PROPRIETARY OFFSET CIRCUITRY OUT1 O
PAGE 2
AD8213 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Application Notes ........................................................................... 11 Applications ....................................................................................... 1 Output Linearity ......................................................................... 11 Functional Block Diagram .............................................
PAGE 3
Data Sheet AD8213 SPECIFICATIONS TOPR = operating temperature range, VS = 5 V, RL = 25 kΩ (RL is the output load resistor), unless otherwise noted. Table 1. Parameter GAIN Initial Accuracy Accuracy Over Temperature Gain vs.
PAGE 4
AD8213 Data Sheet ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Continuous Input Voltage Reverse Supply Voltage HBM (Human Body Model) ESD Rating CDM (Charged Device Model) ESD Rating Operating Temperature Range AD8213Y, AD8213WY AD8213WH Storage Temperature Range Output Short-Circuit Duration Rating 12.5 V −3 V to +68 V −0.3 V ±4000 V ±1000 V Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device.
PAGE 5
Data Sheet AD8213 1 10 2 9 10 –IN1 +IN2 2 AD8213 9 +IN1 GND 3 TOP VIEW (Not to Scale) 8 V+ 7 OUT1 6 CF1 –IN2 1 8 3 OUT2 4 CF2 5 Figure 3. Pin Configuration 7 6 5 06639-002 4 Figure 2. Metallization Diagram Table 3. Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 Mnemonic −IN2 +IN2 GND OUT2 CF2 CF1 OUT1 V+ +IN1 −IN1 X −401 −401 −401 −394 −448 448 394 401 401 401 Y 677 510 −53 −500 −768 −768 −500 −61 510 677 Description Inverting input of the second channel.
PAGE 6
AD8213 Data Sheet GAIN (dB) 40 35 30 25 20 15 10 5 0 –5 –10 –15 –20 –25 –30 –35 –40 10k –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 06639-104 Figure 7. Typical Small Signal Bandwidth (VOUT = 200 mV p-p) 10 OUTPUT ERROR (%) (% ERROR OF THE IDEAL OUTPUT VALUE) 130 COMMON-MODE VOLTAGE > 5V 120 110 CMRR (dB) 10M 1M FREQUENCY (Hz) Figure 4.
PAGE 7
Data Sheet AD8213 0.2 INPUT 100mV/DIV –0.2 OUTPUT –0.4 –0.6 OUTPUT 1V/DIV, CF = 20pF –0.8 1V/DIV, CF = 100pF –1.2 –5 5 15 25 35 45 55 65 INPUT COMMON-MODE VOLTAGE (V) 06639-011 –1.0 06639-015 INPUT BIAS CURRENT (mA) 0 TIME (2µs/DIV) Figure 10. Input Bias Current vs. Common-Mode Voltage (Per Input) Figure 13. Rise Time 7.0 6.5 200mV/DIV 5.5 5.0 INPUT 4.5 4.0 3.5 2V/DIV, CF = 20pF 3.0 2.5 2.0 OUTPUT –2 0 2 4 6 8 65 COMMON-MODE VOLTAGE (V) 06639-016 1.
PAGE 8
AD8213 Data Sheet 0.01/DIV 10 9 8 7 6 5 4 3 2 1 0 –40 06639-105 TIME (5µs/DIV) 11 –20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) Figure 16. Settling Time (Falling) 06639-021 MAXIMUM OUTPUT SOURCE CURRENT (mA) 12 2V/DIV Figure 19. Output Source Current vs. Temperature (Per Channel) 5.0 4.9 OUTPUT VOLTAGE RANGE (V) 4.8 2V/DIV 0.01/DIV 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 06639-106 3.5 TIME (5µs/DIV) 0 OUTPUT SOURCE CURRENT (mA) Figure 17.
PAGE 9
Data Sheet AD8213 2100 TEMP = –40°C TEMP = +25°C TEMP = +125°C 1000 1800 1500 600 COUNT COUNT 800 1200 900 400 600 200 –10 –5 0 5 10 15 VOS (µV/°C) 0 –2.0 1200 800 600 400 200 0 –15 –12 –9 –6 GAIN DRIFT (ppm/°C) –3 0 06639-101 COUNT 1000 –18 –0.5 0 0.5 1.0 Figure 24. Offset Distribution (mV) (VCM = 6 V) 1400 –21 –1.0 VOS (mV) Figure 22. Offset Drift Distribution (µV/°C) (Temperature Range = −40°C to +125°C) –24 –1.5 Figure 23.
PAGE 10
AD8213 Data Sheet THEORY OF OPERATION In typical applications, the AD8213 amplifies a small differential input voltage generated by the load current flowing through a shunt resistor. The AD8213 rejects high common-mode voltages (up to 65 V) and provides a ground referenced, buffered output that interfaces with an analog-to-digital converter (ADC). Figure 25 shows a simplified schematic of the AD8213. This current (IIN1) is converted back to a voltage via ROUT1.
PAGE 11
Data Sheet AD8213 APPLICATION NOTES OUTPUT LINEARITY LOW-PASS FILTERING In all current sensing applications, and especially in automotive and industrial environments where the common-mode voltage can vary significantly, it is important that the current sensor maintain the specified output linearity, regardless of the input differential or common-mode voltage.
PAGE 12
AD8213 Data Sheet APPLICATIONS INFORMATION OVERCURRENT DETECTION (<100ns) HIGH-SIDE CURRENT SENSE WITH A LOW-SIDE SWITCH 8 SHUNT –IN1 10 +IN2 +IN1 9 3 GND 4 OUT2 5 CF2 CAP2 V+ 8 OUT1 7 CF1 6 2 3 4 5 6 7 8 OUT GND NC –IN AD8214 NC VREG +IN SHUNT 3 2 VS 1 SHUNT AD8213 LOAD 1 –IN2 –IN1 10 2 +IN2 +IN1 9 3 GND V+ 8 4 OUT2 OUT1 7 5 CF2 CF1 6 5V LOAD BATTERY 4 CAP2 SWITCH CAP1 CLAMP DIODE 5V CAP1 SHUNT BATTERY Figure 29.
PAGE 13
Data Sheet AD8213 ICHARGE BIDIRECTIONAL CURRENT SENSING The AD8213 can also be configured to sense current in both directions at the inputs. This configuration is useful in charge/ discharge applications. A typical connection diagram is shown in Figure 31. In this mode Channel 1 monitors ILOAD and Channel 2 monitors ICHARGE. ILOAD RSHUNT BATTERY +IN LOAD CHARGER –IN V+ ICHARGE ILOAD AD8210 0.
PAGE 14
AD8213 Data Sheet OUTLINE DIMENSIONS 3.10 3.00 2.90 10 3.10 3.00 2.90 5.15 4.90 4.65 6 1 5 PIN 1 IDENTIFIER 0.50 BSC 0.95 0.85 0.75 15° MAX 1.10 MAX 0.30 0.15 6° 0° 0.23 0.13 COMPLIANT TO JEDEC STANDARDS MO-187-BA 0.70 0.55 0.40 091709-A 0.15 0.05 COPLANARITY 0.10 Figure 33.
PAGE 15
Data Sheet AD8213 NOTES Rev.