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CA3420 PDF даташит

Спецификация CA3420 изготовлена ​​​​«Intersil Corporation» и имеет функцию, называемую «0.5MHz/ Low Supply Voltage/ Low Input Current BiMOS Operational Amplifiers».

Детали детали

Номер произв CA3420
Описание 0.5MHz/ Low Supply Voltage/ Low Input Current BiMOS Operational Amplifiers
Производители Intersil Corporation
логотип Intersil Corporation логотип 

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CA3420 Даташит, Описание, Даташиты
TM
Data Sheet
CA3420, CA3420A
April 2000 File Number 1320.6
0.5MHz, Low Supply Voltage, Low Input
Current BiMOS Operational Amplifiers
The CA3420A and CA3420 are integrated circuit operational
amplifiers that combine PMOS transistors and bipolar
transistors on a single monolithic chip. The CA3420A and
CA3420 BiMOS operational amplifiers feature gate
protected PMOS transistors in the input circuit to provide
very high input impedance, very low input currents (less than
1pA). The internal bootstrapping network features a unique
guardbanding technique for reducing the doubling of leakage
current for every 10oC increase in temperature. The CA3420
series operates at total supply voltages from 2V to 20V
either single or dual supply. These operational amplifiers are
internally phase compensated to achieve stable operation in
the unity gain follower configuration. Additionally, they have
access terminals for a supplementary external capacitor if
additional frequency roll-off is desired. Terminals are also
provided for use in applications requiring input offset voltage
nulling. The use of PMOS in the input stage results in
common mode input voltage capability down to 0.45V below
the negative supply terminal, an important attribute for single
supply application. The output stage uses a feedback OTA
type amplifier that can swing essentially from rail-to-rail. The
output driving current of 1.5mA (Min) is provided by using
nonlinear current mirrors.
Ordering Information
PART NUMBER
CA3420AT
CA3420E
TEMP.
RANGE (oC)
PACKAGE
-55 to 125 8 Pin Metal Can
-55 to 125 8 Ld PDIP
PKG.
NO.
T8.C
E8.3
Features
• 2V Supply at 300µA Supply Current
• 1pA Input Current (Typ) (Essentially Constant to 85oC)
• Rail-to-Rail Output Swing (Drive ±2mA into 1kLoad)
• Pin Compatible with 741 Operational Amplifiers
Applications
• pH Probe Amplifiers
• Picoammeters
• Electrometer (High Z) Instruments
• Portable Equipment
• Inaccessible Field Equipment
• Battery-Dependent Equipment (Medical and Military)
Functional Diagram
X1
-
MOS
BIPOLAR
+
X1
BUFFER AMPS;
BOOTSTRAPPED
INPUT PROTECTION
NETWORK
HIGH GAIN
(50K)
MOS
BIPOLAR
OTA BUFFER
(X2)
Pinouts
CA3420 (PDIP)
TOP VIEW
OFFSET NULL 1
INV.
INPUT
2
NON-INV. 3
INPUT
V- 4
-
+
8 STROBE
7 V+
6 OUTPUT
5 OFFSET NULL
CA3420 (METAL CAN)
TOP VIEW
OFFSET NULL
1
TAB
8
STROBE
7 V+
INV.
INPUT
2
-
+
6 OUTPUT
NON-INV. 3
INPUT
4
5 OFFSET NULL
V-
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil and Design is a trademark of Intersil Corporation. | Copyright © Intersil Corporation 2000









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CA3420 Даташит, Описание, Даташиты
CA3420, CA3420A
Absolute Maximum Ratings
Supply Voltage (V+ to V-). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22V
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15V
DC Input Voltage . . . . . . . . . . . . . . . . . . . . . . (V+ + 8V) to (V- -0.5V)
Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1mA
Output Short Circuit Duration (Note 1). . . . . . . . . . . . . . . . Indefinite
Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -55oC to 125oC
Thermal Information
Thermal Resistance (Typical, Note 2)
θJA (oC/W) θJC (oC/W)
PDIP Package . . . . . . . . . . . . . . . . . . . 105
N/A
Metal Can Package . . . . . . . . . . . . . . . 165
80
Maximum Junction Temperature (Metal Can Package). . . . . . . 175oC
Maximum Junction Temperature (Plastic Package) . . . . . . . 150oC
Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . 300oC
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. Short circuit may be applied to ground or to either supply.
2. θJA is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications Typical Values Intended Only for Design Guidance, VSUPPLY = ±10V, TA = 25oC
PARAMETER
SYMBOL
TEST CONDITIONS
CA3420A
CA3420
Input Resistance
Input Capacitance
Output Resistance
Equivalent Input Noise Voltage
RI
CI
RO
eN f = 1kHz
f = 10kHz
RS = 100
150
4.9
300
62
38
150
4.9
300
62
38
Short-Circuit Current
To Opposite Supply
Gain Bandwidth Product
Slew Rate
Source
Sink
IOM+
IOM-
fT
SR
2.6 2.6
2.4 2.4
0.5 0.5
0.5 0.5
Transient Response
Rise Time
Overshoot
tR RL = 2k, CL = 100pF
OS
0.7 0.7
15 15
Current from Terminal 8
To V-
To V+
I8+
I8-
20 20
22
UNITS
T
pF
nV/Hz
nV/Hz
mA
mA
MHz
V/µs
µs
%
µA
mA
Electrical Specifications For Equipment Design, At VSUPPLY = ±1V, TA = 25oC, Unless Otherwise Specified
PARAMETER
TEST
SYMBOL CONDITIONS
CA3420
MIN TYP MAX
CA3420A
MIN TYP MAX
UNITS
Input Offset Voltage
Input Offset Current (Note 3)
Input Current (Note 3)
Large Signal Voltage Gain
|VIO|
|IIO|
|II|
AOL
RL = 10k
- 5 10
- 0.01 4
- 15
10 100
-
80 100
-
-2
- 0.01
- 0.02
20 100
86 100
5 mV
4 pA
5 pA
- kV/V
- dB
Common Mode Rejection Ratio
CMRR
-
560 1800
-
560 1000 µV/V
55 65
-
60 65 - dB
Common Mode Input Voltage Range
Power Supply Rejection Ratio
Max Output Voltage
Supply Current
VlCR+
VlCR-
PSRR
VIO/V
VOM+
VOM-
I+
RL =
0.2
-
-
60
0.90
-0.85
-
0.5
-1.3
100
80
0.95
-0.91
350
-
-
1000
-
-
-
650
0.2
-1
-
70
0.90
-0.85
-
0.5
-1.3
32
90
0.95
-0.91
350
-V
-V
320 µV/V
- dB
-V
-V
650 µA
Device Dissipation
Input Offset Voltage Temperature Drift
NOTE:
PD
VlO/T
- 0.7 1.1 - 0.7 1.1 mW
- 4 - - 4 - µV/oC
3. The maximum limit represents the levels obtainable on high speed automatic test equipment. Typical values are obtained under laboratory conditions.
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CA3420 Даташит, Описание, Даташиты
CA3420, CA3420A
Electrical Specifications For Equipment Design, at VSUPPLY = ±10V, TA = 25oC, Unless Otherwise Specified
PARAMETER
TEST
SYMBOL CONDITIONS
CA3420
MIN TYP MAX
CA3420A
MIN TYP MAX
UNITS
Input Offset Voltage
Input Offset Current (Note 4)
Input Current (Note 4)
Large Signal Voltage Gain
|VIO|
|IIO|
|II|
AOL
RL = 10k
- 5 10
- 0.03 4
- 0.05 5
10 100
-
80 100
-
-2
- 0.03
- 0.05
20 100
86 100
5 mV
4 pA
5 pA
- kV/V
- dB
Common Mode Rejection Ratio
CMRR
- 100 320 - 100 320 µV/V
70 80
-
70 80 - dB
Common Mode Input Voltage Range
Power Supply Rejection Ratio
Max Output Voltage
Supply Current
VlCR+
VlCR-
PSRR
VIO/V
VOM+
VOM-
I+
RL =
8.5 9.3 - 9.0 9.3 -
V
-10 -10.3
-
-10 -10.3
-
V
-
32 320
-
32 320 µV/V
70 90
-
70 90 - dB
9.7 9.9 - 9.7 9.9 -
V
-9.7 -9.85
-
-9.7 -9.85
-
V
-
450 1000
-
450 1000 µA
Device Dissipation
Input Offset Voltage Temperature Drift
NOTE:
PD
VlO/T
- 9 14 - 9 14 mW
- 4 - - 4 - µV/oC
4. The maximum limit represents the levels obtainable on high speed automatic test equipment. Typical values are obtained under laboratory conditions.
Typical Applications
Picoammeter Circuit
The exceptionally low input current (typically 0.2pA) makes
the CA3420 highly suited for use in a picoammeter circuit.
With only a single 10Gresistor, this circuit covers the range
from ±1.5pA. Higher current ranges are possible with suitable
switching techniques and current scaling resistors. Input
transient protection is provided by the 1Mresistor in series
with the input. Higher current ranges require that this resistor
be reduced. The 10Mresistor connected to pin 2 of the
CA3420 decouples the potentially high input capacitance
often associated with lower current circuits and reduces the
tendency for the circuit to oscillate under these conditions.
High Input Resistance Voltmeter
Advantage is taken of the high input impedance of the CA3420
in a high input resistance DC voltmeter. Only two 1.5V “AA”
type penlite batteries power this exceedingly high-input
resistance (>1,000,000M) DC voltmeter. Full-scale deflection
is ±500mV, ±150mV, and ±15mV. Higher voltage ranges are
easily added with external input voltage attenuator networks.
The meter is placed in series with the gain network, thus
eliminating the meter temperature coefficient error term.
Supply current in the standby position with the meter
undeflected is 300µA. At full-scale deflection this current
rises to 800µA. Carbon-zinc battery life should be in excess
of 1,000 hours.
1M
10G
10M
10pF
+1.5V
2-
7
500-0-500
µA
CA3420
6
M
3+
4
±50pA
5
1
BATTERY
RETURNS ±15pA
10k
1.5k
1.5k, 1%
1k
±5pA
430, 1%
-1.5V
±1.5pA 150, 1%
11k
68
1%
FIGURE 1. PICOAMMETER CIRCUIT
22M
+1.5V
3
10M
+7
CA3420
6
500-0-500
µA
M
100pF
2
-
4
±500mV
5
1
BATTERY
RETURNS
10k
±150mV
-1.5V
±50mV
±15mV
1.5k
1.5k, 1%
1k
430, 1%
150, 1%
1.1k
68
1%
FIGURE 2. HIGH INPUT RESISTANCE VOLTMETER
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