Analog Devices AD8203 a Datasheet
High Common-Mode Voltage,
FEATURES
High common-mode voltage range
−6 V to +30 V at a 5 V supply voltage
Operating temperature range: −40°C to +125°C
Supply voltage range: 3.5 V to 12 V
Low-pass filter (1-pole or 2-pole)
EXCELLENT AC AND DC PERFORMANCE
±2 mV voltage offset
±1 ppm/°C typ gain drift
80 dB CMRR min dc to 10 kHz
PLATFORMS
Transmission control
Diesel injection control
Engine management
Adaptive suspension control
Vehicle dynamics control
GENERAL DESCRIPTION
The AD8203 is a single-supply difference amplifier for amplifying and low-pass filtering small differential voltages in the
presence of a large common-mode voltage. The input CMV
range extends from −6 V to +30 V at a typical supply voltage
of 5 V.
Single-Supply Difference Amplifier
AD8203
FUNCTIONAL BLOCK DIAGRAM
+V
3
Figure 1.
INDUCTIVE
LOAD
A2
+INA1+V
–IN
746
G = ×2
+IN
A2
–IN
5V
NC
S
AD8203
GND
S
AD8203
5
OUT
10kΩ
10kΩ
2
GND
OUT
A2
05013-001
OUTPUT
8
+IN
1
–IN
BATTERY
NC A1
200kΩ200kΩ
NC = NO CONNECT
CLAMP
DIODE
14V
G = ×7
+IN
A1
–IN
4-TERM
SHUNT
POWER
DEVICE
100kΩ
The AD8203 is offered in die and packaged form. The MSOP
package is specified over a wide temperature range of −40°C to
+125°C, while the die is specified over a wide temperature range
of −40°C to +150°C, making the AD8203 well-suited for use in
many automotive platforms.
Automotive platforms demand precision components for better
system control. The AD8203 provides excellent ac and dc
performance, which keeps errors to a minimum in the user’s
system. Typical offset and gain drift in the MSOP package are
8 µV/°C and 1 ppm/°C, respectively. The device also delivers a
minimum CMRR of 80 dB from dc to 10 kHz.
The AD8203 features an externally accessible 100 kΩ resistor at
the output of the preamp A1, which can be used for low-pass
filter applications and for establishing gains other than 14.
Rev. A
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
registered trademarks are the property of their respective owners.
COMMON
NC = NO CONNECT
Figure 2. High Line Current Sensor
POWER
BATTERY
DEVICE
14V
CLAMP
DIODE
COMMON NC = NO CONNECT
4-TERM
SHUNT
INDUCTIVE
LOAD
+INA1+V
AD8203
–IN
5V
GND
NC
OUT
S
Figure 3. Low Line Current Sensor
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.326.8703 © 2005 Analog Devices, Inc. All rights reserved.
www.analog.com
05013-002
OUTPUT
A2
05013-003
AD8203
TABLE OF CONTENTS
Specifications—Single Supply......................................................... 3
Gain Trim .................................................................................... 11
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ........................................................................ 9
Applications..................................................................................... 10
Current Sensing.......................................................................... 10
Gain Adjustment......................................................................... 10
REVISION HISTORY
2/05—Rev. 0 to Rev. A
Changes to Specifications Table...................................................... 3
Changes to Caption on Figure 6 and Figure 8 .............................. 6
Changes to Figure 12........................................................................ 7
Added Figure 14 to Figure 23.......................................................... 7
Changes to Figure 26 and Figure 27............................................. 10
Changes to Figure 29...................................................................... 11
Changes to Figure 32 and Figure 33............................................. 12
Changes to Ordering Guide.......................................................... 13
Low-Pass Filtering...................................................................... 11
High Line Current Sensing with LPF
and Gain Adjustment................................................................. 12
Driving Charge Redistribution ADCs..................................... 12
Outline Dimensions....................................................................... 13
Ordering Guide .......................................................................... 13
10/04—Revision 0: Initial Version
Rev. A | Page 2 of 16
AD8203
SPECIFICATIONS—SINGLE SUPPLY
TA = operating temperature range, VS = 5 V, unless otherwise noted.
Table 1.
AD8203 MSOP AD8203 Die
Parameter Conditions Min Typ Max Min Typ Max Unit
SYSTEM GAIN
Initial 14 14 V/V
Error 0.02 ≤ V
vs. Temperature 1 25 1 30 ppm/°C
VOLTAGE OFFSET
Input Offset (RTI) VCM = 0.15 V; 25°C −2 +2 −2 +2 mV
vs. Temperature −40°C to +125°C −20 +2 +20 −10 +0.3 +10 µV/°C
−40°C to +150°C −15 +5 +15 µV/°C
INPUT
Input Impedance
Differential 260 320 380 260 320 380 kΩ
Common-Mode 130 160 190 130 160 190 kΩ
CMV Continuous −6 +30 −6 +30 V
CMRR1 V
CM
f = DC 82 82 dB
f = 1 kHz 82 82 dB
f = 10 kHz2 80 80 dB
PREAMPLIFIER
Gain 7 7 V/V
Gain Error −0.3 +0.3 −0.3 +0.3 %
Output Voltage Range 0.02 4.8 0.02 4.8 V
Output Resistance 97 100 103 97 100 103 kΩ
OUTPUT BUFFER
Gain 2 2 V/V
Gain Error 0.02 ≤ V
Output Voltage Range 0.02 4.8 0.02 4.8 V
Input Bias Current 40 40 nA
Output Resistance 2 2 Ω
DYNAMIC RESPONSE
System Bandwidth VIN = 0.01 V p-p, V
Slew Rate VIN = 0.28 V, V
NOISE
0.1 Hz to 10 Hz 10 10 µV p-p
Spectral Density, 1 kHz (RTI) 300 300 nV/√Hz
POWER SUPPLY
Operating Range 3.5 12 3.5 12 V
Quiescent Current vs. Temperature VO = 0.1 V dc 0.25 1.0 0.25 1.0 mA
PSRR VS = 3.5 V to 12 V 75 83 75 83 dB
TEMPERATURE RANGE
For Specified Performance −40 +125 −40 +150 °C
1
Source imbalance < 2 Ω.
2
The AD8203 preamplifier exceeds 80 dB CMRR at 10 kHz. However, since the signal is available only by way of a 100 kΩ resistor, even the small amount of pin-to-pin
capacitance between Pins 1, 8 and Pins 3, 4 may couple an input common-mode signal larger than the greatly attenuated preamplifier output. The effect of pin-to-pin
coupling may be neglected in all applications by using filter capacitors at Node 3.
≤ 4.8 V dc @25°C −0.3 +0.3 −0.3 +0.3 %
OUT
= −6 V to 30 V
≤ 4.8 V dc −0.3 +0.3 −0.3 +0.3 %
OUT
= 0.14 V p-p 40 60 40 60 kHz
OUT
= 4 V Step 0.33 0.33 V/µs
OUT
Rev. A | Page 3 of 16
AD8203
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter Rating
Supply Voltage 12.5 V
Transient Input Voltage (400 ms) 44 V
Continuous Input Voltage (Common Mode) 35 V
Reversed Supply Voltage Protection 0.3 V
Operating Temperature Range
Die
MSOP
Storage Temperature
Output Short-Circuit Duration Indefinite
Lead Temperature Range (Soldering 10 sec) 300°C
−40°C to +150°C
−40°C to +125°C
−65°C to +150°C
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate
on the human body and test equipment and can discharge without detection. Although this product
features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to
high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid
performance degradation or loss of functionality.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Rev. A | Page 4 of 16
AD8203
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1
–IN
GND
AD8203
2
A1
3
TOP VIEW
(Not to Scale)
A2
4
NC = NO CONNECT
Figure 4. Pin Configuration
8
+IN
7
+V
S
NC
6
OUT
5
05013-004
Table 3. Pin Function Descriptions
Pin No. Mnemonic X Y
1 −IN
−409.0
−205.2
2 GND −244.6 −413.0
3 A1 +229.4 −413.0
4 A2 +410.0 −308.6
5 OUT +410.0 +272.4
6 NC NA NA
7 +VS +121.0 +417.0
8 +IN −409.0 +205.2
1048µm
+IN
–IN
1036µm
+V
S
A1GND
Figure 5. Metallization Photograph
OUT
A2
04981-0-005
Rev. A | Page 5 of 16
Loading...