DATASHEET

ICL7621
®
Data Sheet
March 4, 2010
FN3403.5
Dual, Low Power CMOS Operational
Amplifiers
Features
The ICL761X/762X series is a family of monolithic CMOS
operational amplifiers. These devices provide the designer
with high performance operation at low supply voltages and
selectable quiescent currents. They are an ideal design tool
when ultra low input current and low power dissipation are
desired.
• High Input Impedance . . . . . . . . . . . . . . . . . . . . . . . 1012Ω
The basic amplifier will operate at supply voltages ranging
from ±1V to ±8V, and may be operated from a single Lithium
cell. The output swing ranges to within a few millivolts of the
supply voltages.
Applications
The quiescent supply current of these amplifiers is set to
100µA at the factory. This results in power consumption as
low as 200µW per amplifier.
• Hearing Aid/Microphone Amplifiers
Of particular significance is the extremely low (1pA) input
current, input noise current of 0.01pA/√Hz, and 1012Ω input
impedance. These features optimize performance in very
high source impedance applications.
• High Impedance Buffers
• Wide Operating Voltage Range . . . . . . . . . . . ±1V to ±8V
• Input Current Lower Than BIFETs . . . . . . . . . . . 1pA (Typ)
• Output Voltage Swing . . . . . . . . . . . . . . . . . . . . V+ and V• Available as Duals (Refer to ICL7611 for Singles)
• Low Power Replacement for Many Standard Op Amps
• Portable Instruments
• Telephone Headsets
• Meter Amplifiers
• Medical Instruments
Pinouts
1
-INA
2
+INA
3
V-
4
-
+
Because of the low power dissipation, junction temperature
rise and drift are quite low. Applications utilizing these
features may include stable instruments, extended life
designs, or high density packages.
OUTA
+
The inputs are internally protected. Outputs are fully
protected against short circuits to ground or to either supply.
ICL7621
(8 LD PDIP, SOIC)
TOP VIEW
-
8
V+
7
OUTB
6
-INB
5
+INB
Ordering Information
TEMP.
RANGE
(°C)
PART
NUMBER
PART
MARKING
ICL7621DCPA
7621 DCPA
ICL7621DCPAZ*
(Note 2)
E8.3
7621 DCPAZ 0 to +70 8 Ld PDIP D Grade - IQ = 100µA
ICL7621DCBA
(Note 1)
7621 DCBA
ICL7621DCBAZ
(Notes 1, 2)
7621 DCBAZ 0 to +70 8 Ld SOIC M8.15
D Grade - IQ = 100µA
PACKAGE
PKG.
DWG. #
E8.3
0 to +70 8 Ld PDIP D Grade - IQ = 100µA
M8.15
0 to +70 8 Ld SOIC D Grade - IQ = 100µA
*Pb-free PDIPs can be used for through hole wave solder processing only.
They are not intended for use in Reflow solder processing applications.
NOTES:
1. Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel
specifications.
2. These Intersil Pb-free plastic packaged products employ special Pbfree material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is RoHS
compliant and compatible with both SnPb and Pb-free soldering
operations). Intersil Pb-free products are MSL classified at Pb-free
peak reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2001, 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
ICL7621
Absolute Maximum Ratings
Thermal Information
Supply Voltage V+ to V- . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . V- -0.3 to V+ +0.3V
Differential Input Voltage (Note 3) . . . . . . . . . [(V+ +0.3) - (V- -0.3)]V
Duration of Output Short Circuit (Note 4). . . . . . . . . . . . . . Unlimited
Thermal Resistance (Typical, Note 5)
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C
θJA (°C/W)
θJC (°C/W)
PDIP Package . . . . . . . . . . . . . . . . . . .
120
N/A
SOIC Package . . . . . . . . . . . . . . . . . . .
160
N/A
Maximum Junction Temperature (Plastic Package) . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . -65°C to +150°C
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
*Pb-free PDIPs can be used for through hole wave solder
processing only. They are not intended for use in Reflow solder
processing applications.
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product reliability and
result in failures not covered by warranty.
NOTES:
3. Long term offset voltage stability will be degraded if large input differential voltages are applied for long periods of time.
4. The outputs may be shorted to ground or to either supply, for VSUPPLY ≤10V. Care must be taken to insure that the dissipation rating is not
exceeded.
5. θJA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
VSUPPLY = ±5V, Unless Otherwise Specified.
PARAMETER
SYMBOL
Input Offset Voltage
VOS
ΔVOS/ΔT
Temperature Coefficient of VOS
Input Offset Current
TEST CONDITIONS
RS ≤ 100kΩ
RS ≤ 100kΩ
IOS
Input Bias Current
IBIAS
TEMP.
(°C)
MIN
MAX
(Note 6) TYP (Note 6) UNITS
+25
-
-
15
mV
Full
-
-
20
mV
-
-
25
-
µV/oC
+25
-
0.5
30
pA
0 to +70
-
-
300
pA
-55 to +125
-
800
pA
+25
-
1.0
50
pA
0 to +70
-
-
400
pA
-55 to +125
-
-
4000
pA
Common Mode Voltage Range
VCMR
IQ = 100µA
+25
±4.2
-
-
V
Output Voltage Swing
VOUT
IQ = 100µA, RL = 100kΩ
+25
±4.9
-
-
V
0 to +70
±4.8
-
-
V
-55 to +125
±4.5
-
-
V
+25
80
102
-
dB
0 to +70
75
-
-
dB
-55 to +125
68
-
-
dB
+25
-
0.48
-
MHz
+25
-
1012
-
Ω
Large Signal Voltage Gain
AVOL
Unity Gain Bandwidth
GBW
Input Resistance
VO = ±4.0V, RL = 100kΩ, IQ = 100µA
IQ = 100µA
RIN
Common Mode Rejection Ratio
CMRR
RS ≤ 100kΩ , IQ = 100µA
+25
70
91
-
dB
Power Supply Rejection Ratio
(VSUPPLY = ±8V to ±2V)
PSRR
RS ≤ 100kΩ , IQ = 100µA
+25
80
86
-
dB
Input Referred Noise Voltage
eN
RS = 100Ω, f = 1kHz
+25
-
100
-
nV/√Hz
Input Referred Noise Current
iN
RS = 100Ω, f = 1kHz
+25
-
0.01
-
pA/√Hz
Supply Current (Per Amplifier)
ISUPPLY
No Signal, No Load, IQ = 100µA
+25
-
0.1
0.25
mA
Channel Separation
VO1/VO2
AV = 100
+25
-
120
-
dB
2
FN3403.5
March 4, 2010
ICL7621
Electrical Specifications
VSUPPLY = ±5V, Unless Otherwise Specified. (Continued)
PARAMETER
SYMBOL
TEMP.
(°C)
TEST CONDITIONS
MIN
MAX
(Note 6) TYP (Note 6) UNITS
Slew Rate
SR
AV = 1, CL = 100pF, VIN = 8VP-P,
IQ = 100µA, RL = 100kΩ
+25
-
0.16
-
V/µs
Rise Time
tR
VIN = 50mV, CL = 100pF,
IQ = 100µA, RL = 100kΩ
+25
-
2
-
µs
Overshoot Factor
OS
VIN = 50mV, CL = 100pF,
IQ = 100µA, RL = 100kΩ
+25
-
10
-
%
NOTE:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by
characterization and are not production tested.
Schematic Diagram
IQ
SETTING STAGE
INPUT STAGE
3k
C
QP5
QP3
QP7
V-
100k
QP2
V+
A
900k
3k
QP1
OUTPUT STAGE
QP6
QP4
6.3V
QP8
V+
+INPUT
QP9
QN1
QN2
CFF = 9pF
OUTPUT
VV+
CC = 33pF
-INPUT
QN9
QN7
QN4
V-
TABLE OF JUMPERS
ICL7621
C, E
IQ
100µA
3
QN10
QN6
QN5
V+
QN3
QN8
QN11
6.3V
E
G
V-
FN3403.5
March 4, 2010
ICL7621
Application Information
Static Protection
Output Stage and Load Driving Considerations
All devices are static protected by the use of input diodes.
However, strong static fields should be avoided, as it is
possible for the strong fields to cause degraded diode
junction characteristics, which may result in increased input
leakage currents.
Each amplifiers’ quiescent current flows primarily in the
output stage. This is approximately 70% of the IQ settings.
This allows output swings to almost the supply rails for
output loads of 1MΩ, 100kΩ, and 10kΩ, using the output
stage in a highly linear class A mode. In this mode,
crossover distortion is avoided and the voltage gain is
maximized. However, the output stage can also be operated
in Class AB for higher output currents (see graphs in “Typical
Performance Curves” beginning on page 6). During the
transition from Class A to Class B operation, the output
transfer characteristic is nonlinear and the voltage gain
decreases.
Latchup Avoidance
Junction-isolated CMOS circuits employ configurations
which produce a parasitic 4-layer (PNPN) structure. The
4-layer structure has characteristics similar to an SCR, and
under certain circumstances may be triggered into a low
impedance state resulting in excessive supply current. To
avoid this condition, no voltage greater than 0.3V beyond the
supply rails may be applied to any pin. In general, the op
amp supplies must be established simultaneously with, or
before any input signals are applied. If this is not possible,
the drive circuits must limit input current flow to 2mA to
prevent latchup.
Choosing the Proper IQ
Each device in the ICL76XX family has a similar IQ setup
scheme, which allows the amplifier to be set to nominal
quiescent currents of 10µA, 100µA or 1mA. These current
settings change only very slightly over the entire supply voltage
range. The ICL7611/12 have an external IQ control terminal,
permitting user selection of each amplifiers’ quiescent current.
The ICL7621 has a fixed IQ setting of 100µA.
VIN
Frequency Compensation
The ICL76XX are internally compensated, and are stable
for closed loop gains as low as unity with capacitive loads
up to 100pF.
Typical Applications
The user is cautioned that, due to extremely high input
impedances, care must be exercised in layout, construction,
board cleanliness, and supply filtering to avoid hum and
noise pickup.
+5
ICL76XX
+
VOUT
-
+5
-
VIN
ICL76XX
VOUT
RL ≥ 10kΩ
TO CMOS OR
LPTTL LOGIC
+
100kΩ
1MΩ
FIGURE 1. SIMPLE FOLLOWER
FIGURE 2. LEVEL DETECTOR
-
1/2
ICL7621
1MΩ
λ
VOUT
+
-
1/2
ICL7621
+
1µF
+
ICL76XX
1MΩ
+
1MΩ
VV+
DUTY CYCLE
680kΩ
WAVEFORM GENERATOR
NOTE: Low leakage currents allow integration times up to
several hours.
FIGURE 3. PHOTOCURRENT INTEGRATOR
4
NOTE: Since the output range swings exactly from rail to rail,
frequency and duty cycle are virtually independent of power supply
variations.
FIGURE 4. TRIANGLE/SQUARE WAVE GENERATOR
FN3403.5
March 4, 2010
ICL7621
1MΩ
+8V
VOH
VIN 10kΩ
20kΩ
2.2MΩ
0.5µF
+
1/2
ICL7621
10µF
TO
SUCCEEDING
INPUT
STAGE
20kΩ
1.8k = 5%
SCALE
ADJUST
-
+
OUT
-
VOL
V-
-
V+
1/2
ICL7621
+
COMMON
TA = +125°C
V+
-8V
FIGURE 6. BURN-IN AND LIFE TEST CIRCUIT
FIGURE 5. AVERAGING AC TO DC CONVERTER FOR A/D
CONVERTERS SUCH AS ICL7106, ICL7107,
ICL7109, ICL7116, ICL7117
0.2µF
0.2µF
30kΩ
160kΩ
+
1/2
ICL7621
0.2µF
680kΩ
100kΩ
51kΩ
+
1/2
ICL7621
INPUT
-
360kΩ
0.1µF
360kΩ
0.2µF
NOTE 7
1MΩ
0.1µF
OUTPUT
1MΩ
NOTE 7
NOTES:
7. Small capacitors (25pF to 50pF) may be needed for stability in some cases.
8. The low bias currents permit high resistance and low capacitance values to be used to achieve low frequency cutoff. fC = 10Hz, AVCL = 4,
Passband ripple = 0.1dB.
FIGURE 7. FIFTH ORDER CHEBYCHEV MULTIPLE FEEDBACK LOW PASS FILTER
5
FN3403.5
March 4, 2010
ICL7621
Typical Performance Curves
104
10k
SUPPLY CURRENT (µA)
SUPPLY CURRENT (µA)
TA = +25°C
NO LOAD
NO SIGNAL
1k
IQ = 100µA
100
10
1
0
2
4
6
8
10
SUPPLY VOLTAGE (V)
12
14
-25
10
1.0
-25
0
25
50
75
FREE-AIR TEMPERATURE (°C)
100
105
IQ = 100µA
103
102
10
10
100
1k
10k
FREQUENCY (Hz)
100k
1M
FIGURE 12. LARGE SIGNAL FREQUENCY RESPONSE
6
50
75
100
125
VSUPPLY = 10V
VOUT = 8V
100
RL = 100kΩ
IQ = 100µA
10
1
-75
125
-50
-25
25
0
50
75
100
125
FIGURE 11. LARGE SIGNAL DIFFERENTIAL VOLTAGE GAIN
vs FREE-AIR TEMPERATURE
COMMON MODE REJECTION RATIO (dB)
TA = +25°C
VSUPPLY = 15V
1.0
25
FREE-AIR TEMPERATURE (°C)
107
104
0
FIGURE 9. SUPPLY CURRENT PER AMPLIFIER vs FREE-AIR
TEMPERATURE
DIFFERENTIAL VOLTAGE GAIN (kV/V)
INPUT BIAS CURRENT (pA)
100
FIGURE 10. INPUT BIAS CURRENT vs TEMPERATURE
DIFFERENTIAL VOLTAGE GAIN (V/V)
10
1000
VS = ±5V
1
0.1
IQ = 100µA
102
FREE-AIR TEMPERATURE (°C)
1000
106
103
1
-50
16
FIGURE 8. SUPPLY CURRENT PER AMPLIFIER vs SUPPLY
VOLTAGE
0.1
-50
V+ - V- = 10V
NO LOAD
NO SIGNAL
105
VSUPPLY = 10V
100
95
IQ = 100µA
90
85
80
75
70
-75
-50
-25
0
25
50
75
100
125
FREE-AIR TEMPERATURE (°C)
FIGURE 13. COMMON MODE REJECTION RATIO vs FREE-AIR
TEMPERATURE
FN3403.5
March 4, 2010
ICL7621
(Continued)
EQUIVALENT INPUT NOISE VOLTAGE (nV/√Hz)
SUPPLY VOLTAGE REJECTION RATIO (dB)
Typical Performance Curves
100
VSUPPLY = 10V
95
90
IQ = 100µA
85
80
75
70
65
-75
-50
-25
0
25
50
75
100
125
600
TA = +25°C
3V ≤ VSUPPLY ≤ 16V
500
400
300
200
100
0
10
100
1k
FREQUENCY (Hz)
FREE-AIR TEMPERATURE (°C)
FIGURE 14. POWER SUPPLY REJECTION RATIO vs FREE-AIR
TEMPERATURE
MAXIMUM OUTPUT SINK CURRENT (mA)
TA = +25°C
IQ = 100µA
8
VSUPPLY
= ±5V
6
4
2
0
100
VSUPPLY
= ±2V
1k
10k
100k
FREQUENCY (Hz)
1M
10M
0.1
IQ = 100µA
1.0
10
0
2
4
6
8
10
12
14
16
SUPPLY VOLTAGE (V)
FIGURE 17. OUTPUT SINK CURRENT vs SUPPLY VOLTAGE
FIGURE 16. OUTPUT VOLTAGE vs FREQUENCY
8
INPUT AND OUTPUT VOLTAGE (V)
MAXIMUM PEAK-TO-PEAK
OUTPUT VOLTAGE (VP-P)
0.01
VSUPPLY
= ±8V
12
10
100k
FIGURE 15. EQUIVALENT INPUT NOISE VOLTAGE vs
FREQUENCY
16
14
10k
6
TA = +25°C, VSUPPLY = 10V
RL = 100kΩ, CL = 100pF
4
2
OUTPUT
0
-2
INPUT
-4
-6
0
20
40
60
80
100
120
TIME (µs)
FIGURE 18. VOLTAGE FOLLOWER LARGE SIGNAL PULSE RESPONSE (IQ = 100µA)
7
FN3403.5
March 4, 2010
ICL7621
Dual-In-Line Plastic Packages (PDIP)
E8.3 (JEDEC MS-001-BA ISSUE D)
N
8 LEAD DUAL-IN-LINE PLASTIC PACKAGE
E1
INDEX
AREA
1 2 3
INCHES
N/2
-B-
-AD
E
BASE
PLANE
-C-
SEATING
PLANE
A2
A
L
D1
e
B1
D1
A1
eC
B
0.010 (0.25) M
C A B S
MILLIMETERS
SYMBOL
MIN
MAX
MIN
MAX
NOTES
A
-
0.210
-
5.33
4
A1
0.015
-
0.39
-
4
A2
0.115
0.195
2.93
4.95
-
B
0.014
0.022
0.356
0.558
-
C
L
B1
0.045
0.070
1.15
1.77
8, 10
eA
C
0.008
0.014
0.204
C
D
0.355
0.400
9.01
eB
NOTES:
1. Controlling Dimensions: INCH. In case of conflict between
English and Metric dimensions, the inch dimensions control.
0.005
-
0.13
-
5
E
0.300
0.325
7.62
8.25
6
E1
0.240
0.280
6.10
7.11
5
e
0.100 BSC
eA
0.300 BSC
3. Symbols are defined in the “MO Series Symbol List” in Section
2.2 of Publication No. 95.
eB
-
L
0.115
5. D, D1, and E1 dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 inch
(0.25mm).
6. E and eA are measured with the leads constrained to be perpendicular to datum -C- .
5
D1
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
4. Dimensions A, A1 and L are measured with the package seated
in JEDEC seating plane gauge GS-3.
0.355
10.16
N
8
2.54 BSC
7.62 BSC
0.430
-
0.150
2.93
8
6
10.92
7
3.81
4
9
Rev. 0 12/93
7. eB and eC are measured at the lead tips with the leads unconstrained. eC must be zero or greater.
8. B1 maximum dimensions do not include dambar protrusions.
Dambar protrusions shall not exceed 0.010 inch (0.25mm).
9. N is the maximum number of terminal positions.
10. Corner leads (1, N, N/2 and N/2 + 1) for E8.3, E16.3, E18.3,
E28.3, E42.6 will have a B1 dimension of 0.030 - 0.045 inch
(0.76 - 1.14mm).
8
FN3403.5
March 4, 2010
ICL7621
Small Outline Plastic Packages (SOIC)
M8.15 (JEDEC MS-012-AA ISSUE C)
N
INDEX
AREA
8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE
0.25(0.010) M
H
B M
INCHES
E
SYMBOL
-B1
2
3
L
SEATING PLANE
-A-
A
D
h x 45°
-C-
e
A1
B
0.25(0.010) M
C
0.10(0.004)
C A M
MIN
MAX
MIN
MAX
NOTES
A
0.0532
0.0688
1.35
1.75
-
A1
0.0040
0.0098
0.10
0.25
-
B
0.013
0.020
0.33
0.51
9
C
0.0075
0.0098
0.19
0.25
-
D
0.1890
0.1968
4.80
5.00
3
E
0.1497
0.1574
3.80
4.00
4
e
α
B S
0.050 BSC
1.27 BSC
-
H
0.2284
0.2440
5.80
6.20
-
h
0.0099
0.0196
0.25
0.50
5
L
0.016
0.050
0.40
1.27
6
N
α
NOTES:
MILLIMETERS
8
0°
8
8°
0°
7
8°
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of
Publication Number 95.
Rev. 1 6/05
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” does not include mold flash, protrusions or gate burrs.
Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006
inch) per side.
4. Dimension “E” does not include interlead flash or protrusions. Interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per
side.
5. The chamfer on the body is optional. If it is not present, a visual index
feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. The lead width “B”, as measured 0.36mm (0.014 inch) or greater
above the seating plane, shall not exceed a maximum value of
0.61mm (0.024 inch).
10. Controlling dimension: MILLIMETER. Converted inch dimensions
are not necessarily exact.
All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems.
Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries 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 Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
9
FN3403.5
March 4, 2010
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