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Analog Devices Semiconductor Electronic Components Datasheet

AD22050 Datasheet

Single-Supply Sensor Interface Amplifier

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AD22050 pdf
a
FEATURES
Gain of ؋20. Alterable from ؋1 to ؋160
Input CMR from Below Ground to 6؋ (VS – 1 V)
Output Span 20 mV to (VS – 0.2) V
1-, 2-, 3-Pole Low-Pass Filtering Available
Accurate Midscale Offset Capability
Differential Input Resistance 400 k
Drives 1 kLoad to +4 V Using VS = +5 V
Supply Voltage: +3.0 V to +36 V
Transient Spike Protection and RFI Filters Included
Peak Input Voltage (40 ms): 60 V
Reversed Supply Protection: –34 V
Operating Temperature Range: –40؇C to +125؇C
APPLICATIONS
Current Sensing
Motor Control
Interface for Pressure Transducers, Position Indicators,
Strain Gages, and Other Low Level Signal Sources
Single-Supply Sensor
Interface Amplifier
AD22050
FUNCTIONAL BLOCK DIAGRAM
+VS OFS A1 A2
AD22050
IN+
A1
IN–
A2 OUT
GND
GENERAL DESCRIPTION
The AD22050 is a single-supply difference amplifier for ampli-
fying and low-pass filtering small differential voltages (typically
100 mV FS at a gain of 40) from sources having a large common-
mode voltage.
Supply voltages from +3.0 V to +36 V can be used. The input
common-mode range extends from below ground to +24 V using
a +5 V supply with excellent rejection of this common-mode
voltage. This is achieved by the use of a special resistive attenua-
tor at the input, laser trimmed to a very high differential balance.
Provisions are included for optional low-pass filtering and gain
adjustment. An accurate midscale offset feature allows bipolar
signals to be amplified.
+VS (CAR BATTERY)
SOLENOID
LOAD
+5V
ANALOG OUTPUT
4V PER AMP
100m
AD22050
200k
CMOS DRIVER
CORNER FREQUENCY
= 0.796Hz-F
C
CHASSIS
POWER
DARLINGTON
SINGLE-POLE LOW-PASS FILTERING, GAIN: 40
ANALOG GROUND
Figure 1. Typical Application Circuit for a Current Sensor Interface
REV. C
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999



Analog Devices Semiconductor Electronic Components Datasheet

AD22050 Datasheet

Single-Supply Sensor Interface Amplifier

No Preview Available !

AD22050 pdf
AD22050–SPECIFICATIONS (TA = +25؇C, VS = +5 V, and VCM = 0, RL = 10 kunless otherwise noted)
Parameter
Test Conditions
Min Typ Max Units
INPUTS (Pins 1 and 8)
+CMR
–CMR
CMRRLF
CMRRHF
RINCM
RMATCH
RINDIFF
Positive Common-Mode Range
Negative Common-Mode Range
Common-Mode Rejection Ratio
Common-Mode Rejection Ratio
Common-Mode Input Resistances
Matching of Resistances
Differential Input Resistance
TA = TMIN to TMAX
TA = TMIN to +85°C
f 10 Hz
f = 10 kHz
Pin 1 or Pin 8 to Pin 2
Pin 1 to Pin 8
–1.0
80
60
180
280
+24
90
75
240 300
± 0.5
400
V
V
dB
dB
k
%
k
PREAMPLIFIER
GCL
VO
RO
Closed-Loop Gain1
Output Voltage Range (Pin 3)
Output Resistance2
9.7 10.0 10.3
+0.01
+4.8 V
97 100 103 k
OUTPUT BUFFER
GCL
VO
RO
Closed-Loop Gain1
Output Voltage Range3
Output Resistance (Pin 5)
RLOAD 10 k
TA = TMIN to TMAX
VO 0.1 V dc, IO < 1 mA
1.94
+0.02
2.0
2.0
2.06
+4.8 V
OVERALL SYSTEM
G
VOS
OFS
IOSC
BW–3 dB
SR
NSD
Gain1
Over Temperature
Input Offset Voltage4
VO 0.1 V dc
TA = TMIN to TMAX
19.9 20.0 20.1
19.8 20.2
–1 0.03 1 mV
Over Temperature
Midscale Offset (Pin 7) Scaling
TA = TMIN to TMAX
–3 3 mV
0.49 0.50 0.51 V/V
Input Resistance
Pin 7 to Pin 2
2.5 3.0
k
Short-Circuit Output Current
–3 dB Bandwidth
Slew Rate
Noise Spectral Density3
TA = TMIN to TMAX
VO = +1 V dc
f = 100 Hz to 10 kHz
7
11 25
30
0.2
0.2
mA
kHz
V/µs
µV/Hz
POWER SUPPLY
VS
IS
Operating Range
Quiescent Supply Current5
TA = TMIN to TMAX
3.0
TA = +25°C, VS = +5 V
5 36 V
200 500 µA
TEMPERATURE RANGE
TOP Operating Temperature Range
–40 +125 °C
NOTES
1Specified for default mode, i.e., with no external components. The overall gain is trimmed to 0.5%, while the individual gains of A1 and A2 may be subject to a
maximum ±3% tolerance. Note that the actual gain in a particular application can be modified by the use of external resistor networks.
2The actual output resistance of A1 is only a few ohms, but access to this output, via Pin 3, is always through the resistor R12 (see Figure 16) which is 100 k,
trimmed to ± 3%.
3For VCM 20 V. For VCM > 20 V, VOL 1 mV/V × VCM.
4Referred to the input (Pins 1 and 8).
5With VDM = 0 V. Differential mode signals are referred to as VDM, while VCM refers to common-mode voltages—see the section Product Description and Figure 3.
All min and max specifications are guaranteed, although only those marked in boldface are tested on all production units at final test.
Specifications subject to change without notice.
ORDERING GUIDE
Model
Temperature Range Package Descriptions
AD22050N
AD22050R
AD22050R-Reel
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Plastic DIP
Plastic SOIC
Tape and Reel
*Quantities must be in increments of 2,500 pieces each.
Package Options
N-8
SO-8
SO-8*
–2– REV. C



Analog Devices Semiconductor Electronic Components Datasheet

AD22050 Datasheet

Single-Supply Sensor Interface Amplifier

No Preview Available !

AD22050 pdf
AD22050
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . +3.0 V to +36 V
Peak Input Voltage (40 ms) . . . . . . . . . . . . . . . . . . . . . . +60 V
VOFS (Pin 7 to Pin 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +20 V
Reversed Supply Voltage Protection . . . . . . . . . . . . . . . –34 V
Operating Temperature . . . . . . . . . . . . . . . . –40°C to +125°C
Storage Temperature . . . . . . . . . . . . . . . . . . –65°C to +150°C
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Lead Temperature Range (Soldering 60 sec) . . . . . . . . +300°C
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; the functional operation of
the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
PIN CONFIGURATIONS
Plastic Mini-DIP Package
(N-8)
Plastic SOIC Package
(SO-8)
–IN 1
8 +IN
GND 2 AD22050 7 OFFSET
TOP VIEW
A1 3 (Not to Scale) 6 +VS
A2 4
5 OUT
–IN 1
8 +IN
GND 2 AD22050 7 OFFSET
TOP VIEW
A1 3 (Not to Scale) 6 +VS
A2 4
5 OUT
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 the AD22050 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.
WARNING!
ESD SENSITIVE DEVICE
PRODUCT DESCRIPTION
The AD22050 is a single-supply difference amplifier consisting
of a precision balanced attenuator, a very low drift preamplifier
and an output buffer amplifier (A1 and A2, respectively, in
Figure 2). It has been designed so that small differential sig-
nals (VDM in Figure 3) can be accurately amplified and filtered
in the presence of large common-mode voltages (VCM) without
the use of any other active components.
+VS OFS A1 A2
AD22050
IN+
A1
IN–
A2 OUT
GND
Figure 2. Simplified Schematic
The resistive attenuator network is situated at the input to the
AD22050 (Pins 1 and 8), allowing the common-mode voltage at
Pins 1 and 8 to be six times greater than that which can be toler-
ated by the actual input to A1. As a result, the input common-
mode range extends to 6× (VS – 1 V).
Two small filter capacitors (not shown in Figure 2) have been
included at the inputs of A1 to minimize the effects of any spuri-
ous RF signals present in the signal.
Internal feedback around A1 sets the closed-loop gain of the
preamplifier to ×10 from the input pins; the output of A1 is
connected to Pin 3 via a 100 kresistor, which is trimmed to
± 3% (R12 in Figure 2) to facilitate the low-pass filtering of the
signal of interest (see Low-Pass Filtering section). The inclusion
of an additional resistive network allows the output of A1 to be
offset to an optional voltage of one half of that supplied to Pin 7;
in many cases this offset would be +VS/2 by tying Pin 7 to +VS
(Pin 6), permitting the conditioning and processing of bipolar
signals (see Strain Gage Interface section).
The output buffer A2 has a gain of ×2, setting the precalibrated,
overall gain of the AD22050, with no external components, to
×20. (This gain is easily user-configurable—see Altering the
Gain section for details.)
The dynamic properties of the AD22050 are optimized for
interfacing to transducers; in particular, current sensing shunt
resistors. Its rejection of large, high frequency, common-mode
signals makes it superior to that of many alternative approaches.
This is due to the very careful design of the input attenuator and
the close integration of this highly balanced, high impedance
system with the preamplifier.
APPLICATIONS
The AD22050 can be used wherever a high gain, single-supply
differencing amplifier is required, and where a finite input resis-
tance (240 kto ground, 400 kbetween differential inputs)
can be tolerated. In particular, the ability to handle a common-
mode input considerably larger than the supply voltage is fre-
quently of value.
Also, the output can run down to within 20 mV of ground,
provided it is not called on to sink any load current. Finally, the
output can be offset to half of a full-scale reference voltage (with
a tolerance of ± 2%) to allow a bipolar input signal.
ALTERING THE GAIN
The gain of the preamplifier, from the attenuator input (Pins 1
and 8) to its output at Pin 3, is ×10 and that of the output
buffer, from Pin 4 to Pin 5, is ×2, thus making the overall de-
fault gain ×20. The overall gain is accurately trimmed (to within
± 0.5%). In some cases, it may be desirable to provide for some
variation in the gain; for example, in absorbing the scaling error
of a transducer.
Figure 3 shows a general method for trimming the gain, either
upward or downward, by an amount dependent on the resistor,
R. The gain range, expressed as a percentage of the overall gain,
REV. C
–3–




Part Number AD22050
Description Single-Supply Sensor Interface Amplifier
Maker Analog Devices
Total Page 8 Pages
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