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ICL7650BCSD

P1-P3P4-P6P7-P9P10-P12
-30
-10
-20
1
0
3
2
4
2684 10121416
MAXIMUM OUTPUT CURRENT
vs. SUPPLY VOLTAGE
ICL7650toc01
TOTAL SUPPLY VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (mA)
SOURCE CURRENT
SINK CURRENT
1k
100
10
1
0.1
25 7550 100 125 150
CLOCK RIPPLE REFERRED TO INPUT
vs. TEMPERATURE
ICL7650toc02
TEMPERATURE (°C)
CLOCK RIPPLE (µVp-p)
BROADBAND
NOISE
(A
V
= 1000)
0.1µF
1µF
0
1
2
3
48106 121416
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
ICL7650toc03
TOTAL SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
Typical Operating Characteristics
(Circuit of Figure 1, V+ = +5V, V- = -5V, T
A
= +25°C, unless otherwise noted.)
ICL7650/ICL7650B/ICL7653/ICL7653B
Chopper-Stabilized Op Amps
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS—ICL7650/ICL7653 (continued)
(Circuit of Figure 1, V+ = +5V, V- = -5V, T
A
= +25°C, unless otherwise noted.) (Note 5)
C
L
= 50pF, R
L
= 10kΩ
f = 10Hz
R
S
= 100Ω, f = 0 to 10Hz
V+ to V- = ±3V to ±8V
CMVR = -5V to +2.5V
%
CONDITIONS
µs0.2t
r
Rise Time
V/µs2.5SRSlew Rate
MHz2.0GBWUnity-Gain Bandwidth
pA/√Hz
0.01I
n
Input Noise Current
µVp-p2e
np-p
Input Noise Voltage
dB120 130PSRRPower-Supply Rejection Ratio
dB120 130CMRRCommon-Mode Rejection Ratio
20Overshoot
V4.5 16V+ to V-Operating Supply Range
No load mA1.2 2.0I
SUPP
Supply Current
UNITSMIN TYP MAXSYMBOLPARAMETER
Pins 13 and 14 open (DIP) Hz120 200 375f
CLKOUT
Internal Chopping Frequency
R
L
= 100kΩ µA25 70 200Clamp On Current (Note 4)
-4.0 ≤ V
OUT
≤ +4.0V pA1Clamp Off Current (Note 4)
nV/
√month
100Offset Voltage vs. Time
Note 3: OUTPUT and CLAMP pins not connected.
Note 4: See Output Clamp section for details.
Note 5: All pins are designed to withstand electrostatic discharge (ESD) levels in excess of 2000V (MIL STD 8838 Method 3015.1
test circuit).
Note 6: Sample tested. Limits are not used to calculate outgoing quality level.
ICL7650/ICL7650B/ICL7653/ICL7653B
Chopper-Stabilized Op Amps
_______________________________________________________________________________________ 5
0
1
2
3
-50 25 50-25 0 75 100 125
SUPPLY CURRENT vs.
AMBIENT TEMPERATURE
ICL7650toc04
AMBIENT TEMPERATURE (°C)
SUPPLY CURRENT (mA)
0
2
1
4
3
5
6
7
8
0231 45678
COMMON-MODE INPUT VOLTAGE RANGE
vs. SUPPLY VOLTAGE
ICL7650toc05
SUPPLY VOLTAGE (V)
COMMON-MODE INPUT VOLTAGE RANGE (V)
POSITIVE LIMIT
NEGATIVE LIMIT
0
-2
-6
-4
-8
-10
10 100 1k 10k
INPUT OFFSET VOLTAGE
vs. CHOPPING FREQUENCY
ICL7650toc06
CHOPPING FREQUENCY (CLOCK OUT) (Hz)
OFFSET VOLTAGE (µV)
3
1
2
-1
0
-2
-3
48106 121416
INPUT OFFSET VOLTAGE CHANGE
vs. SUPPLY VOLTAGE
ICL7650toc07
TOTAL SUPPLY VOLTAGE (V)
INPUT OFFSET VOLTAGE CHANGE (µV)
0
1
3
2
4
5
10 100 1k 10k
10Hzp-p NOISE VOLTAGE
vs. CHOPPING FREQUENCY
ICL7650toc08
CHOPPING FREQUENCY (CLOCK-OUT) (Hz)
DC TO 10Hz P-P NOISE VOLTAGE (µV)
20
60
40
100
80
140
120
160
0.01 1 100.1 100 1k 10k 100k
OPEN-LOOP GAIN AND PHASE SHIFT
vs. FREQUENCY
ICL7650toac09
FREQUENCY (Hz)
OPEN-LOOP GAIN (dB)
110
130
70
90
50
PHASE SHIFT (DEGREES)
R
L
= 10kΩ
C
EXT
= 0.1µF
20
60
40
100
80
140
120
160
0.01 1 100.1 100 1k 10k 100k
OPEN-LOOP GAIN AND PHASE SHIFT
vs. FREQUENCY
ICL7650toac10
FREQUENCY (Hz)
OPEN-LOOP GAIN (dB)
110
130
70
90
50
PHASE SHIFT (DEGREES)
R
L
= 10kΩ
C
EXT
= 1.0µF
-3
-2
-1
0
1
2
3
-1.0 0-0.5 0.5 1.0 1.5 2.0 2.5 3.0
VOLTAGE FOLLOWER LARGE-SIGNAL
PULSE RESPONSE
ICL7650toc11
TIME (µs)
OUTPUT VOLTAGE (V)
CLOCK OUT HIGH
CLOCK OUT LOW
-3
-2
-1
0
1
2
3
-1.0 0-0.5 0.5 1.0 1.5 2.0 2.5 3.0
VOLTAGE FOLLOWER LARGE-SIGNAL
PULSE RESPONSE
ICL7650toc12
TIME (µs)
OUTPUT VOLTAGE (V)
CLOCK OUT HIGH
CLOCK OUT LOW
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V+ = +5V, V- = -5V, T
A
= +25°C, unless otherwise noted.)
ICL7650/ICL7650B/ICL7653/ICL7653B
Chopper-Stabilized Op Amps
6 _______________________________________________________________________________________
Detailed Description
Figure 2 shows the major elements of the ICL7650/
ICL7653. Two amplifiers are illustrated, the main amplifi-
er and the nulling amplifier, both of which have offset-
null capability. The main amplifier is connected full time
from the input to the output. The nulling amplifier, under
control of the chopper-frequency oscillator and clock
circuit, alternately nulls itself and the main amplifier. This
nulling arrangement, which is independent of the output
level, operates over the full power-supply and common-
mode ranges. The ICL7650/ICL7653 exhibit an excep-
tionally high CMRR, PSRR, and A
VOL
. Their nulling
connections, which are MOSFET back gates, have inher-
ently high impedance. Two external capacitors provide
storage for the nulling potentials and the necessary
nulling-loop time constants.
The ICL7650/ICL7653 minimize chopper-frequency
charge injection at the input terminals by carefully bal-
ancing the input switches. Feed-forward injection into
the compensation capacitor, the main cause of output
spikes in this type of circuit, is also minimized.
Output Clamp (ICL7650 Only)
The output clamp reduces the overload recovery time
inherent with chopper-stabilized amplifiers. When tied to
the summing junction or inverting input pin, a current path
between this point and the output occurs just before the
output device saturates. This prevents uncontrolled input
differential and the consequent charge build-up on the
correction-storage capacitors, while causing only a slight
reduction in the output swing.
Intermodulation
Intermodulation effects can cause problems in older
chopper-stabilized amplifier modules. Intermodulation
occurs since the amplifier has a finite AC gain, and
therefore will have a small AC signal at the input. In a
chopper-stabilized module, this small AC signal is
detected, chopped, and fed into the offset-correction
circuit. This results in spurious outputs at the sum and
difference frequencies of the chopping and input signal
frequencies. Other intermodulation effects in chopper-
stabilized modules include gain and phase anomalies
near the chopping frequency.
These effects are substantially reduced in the
ICL7650/ICL7653, which add to the nulling circuit a
dynamic current that compensates for the AC signal on
the inputs. Unlike modules, the ICL7650/ICL7653 can
precisely compensate for the finite AC gain, since both
the AC gain rolloff and the intermodulation compensation
current are controlled by internal matched capacitors.
ICL7650
ICL7653
OUTPUT
C
C
R
C
0.1µF 0.1µF
R2
1M
R1
1M
ICL7650
INTERNAL
BIAS
EXT CLK IN
CLK OUT
NULL
C
EXTA
C
EXTB
CAP RETURN
B
A
C
P
A
+
-
N
OUTPUT
+IN
-IN
CLAMP
MAIN
+
-
B
C
INT/EXT
A
A
A = CLK OUT
A
EXT CLK IN
B
C
OSC
Figure 1. ICL7650 Test Circuit
Figure 2. Block Diagram
P1-P3P4-P6P7-P9P10-P12

ICL7650BCSD

Mfr. #:
Buy ICL7650BCSD
Manufacturer:
Maxim Integrated
Description:
IC OPAMP CHOPPER/STABLE 14-SOIC
Lifecycle:
New from this manufacturer.
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