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PDF CA5420A Data sheet ( Hoja de datos )
| Número de pieza | CA5420A | |
| Descripción | 0.5MHz/ Low Supply Voltage/ Low Input Current BiMOS Operational Amplifiers | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
CA5420A
September 1998 File Number 1925.4
0.5MHz, Low Supply Voltage, Low Input
Current BiMOS Operational Amplifiers
The CA5420A is an integrated circuit operational amplifier
that combines PMOS transistors and bipolar transistors on a
single monolithic chip. It is designed and guaranteed to
operate in microprocessor logic systems that use V+ = 5V,
V- = GND, since it can operate down to ±1V supplies. It will
also be suitable for 3.3V logic systems.
The CA5420A BiMOS operational amplifier features 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
CA5420A operates at total supply voltages from 2V to 20V
either single or dual supply. This operational amplifier is
internally phase compensated to achieve stable operation in
the unity gain follower configuration. Additionally, it has
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 1.0mA (Min) is provided by using
nonlinear current mirrors.
This device has guaranteed specifications for 5V operation
over the full military temperature range of -55oC to 125oC.
The CA5420A has the same 8 lead pinout used for the
industry standard 741.
Functional Diagram
X1
-
MOS
BIPOLAR
+
X1
BUFFER AMPS;
BOOTSTRAPPED
INPUT PROTECTION
NETWORK
HIGH GAIN
(50K)
MOS
BIPOLAR
OTA BUFFER
(X2)
Features
• CA5420A at 5V Supply Voltage with Full Military
Temperature Range Guaranteed Specifications
• CA5420A Guaranteed to Operate from ±1V to ±10V
Supplies
• 2V Supply at 300µA Supply Current
• 1pA (Typ) Input Current (Essentially Constant to 85oC)
• Rail-to-Rail Output Swing (Drive ±2mA Into 1kΩ Load)
• Pin Compatible with 741 Op Amp
Applications
• pH Probe Amplifiers
• Picoammeters
• Electrometer (High Z) Instruments
• Portable Equipment
• Inaccessible Field Equipment
• Battery Dependent Equipment (Medical and Military)
• 5V Logic Systems
• Microprocessor Interface
Ordering Information
PART NUMBER
(BRAND)
CA5420AM
(5420A)
TEMP.
RANGE (oC)
PACKAGE
-55 to 125 8 Ld SOIC
PKG.
NO.
M8.15
Pinout
CA5420A
(SOIC)
TOP VIEW
OFFSET
NULL
1
INV.
INPUT
2
NON-INV. 3
INPUT
V- 4
-
+
NOTE: Pin is connected to Case.
8 STROBE
7 V+
6 OUTPUT
5
OFFSET
NULL
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Copyright © Intersil Corporation 1999
1 page  
CA5420A
Typical Applications
Picoammeter Circuit
The exceptionally low input current (typically 0.2pA) makes
the CA5420A highly suited for use in a picoammeter circuit.
With only a single 10GΩ resistor, 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 1MΩ resistor in series
with the input. Higher current ranges require that this resistor
be reduced. The 10MΩ resistor connected to pin 2 of the
CA5420A decouples the potentially high input capacitance
often associated with lower current circuits and reduces the
tendency for the circuit to oscillate under these conditions.
10GΩ
1MΩ
10MΩ
10pF +1.5V
2-
7
CA5420A
6
500-0-500
µA
M
3+
4
5
1
BATTERY
RETURNS
10kΩ
-1.5V
±50pA
±15pA
±5pA
±1.5pA
1.5kΩ
1.5kΩ
1%
1kΩ
430Ω
1%
150Ω
1%
11kΩ
68Ω
1%
High Input Resistance Voltmeter
Advantage is taken of the high input impedance of the
CA5420A in a high input resistance DC voltmeter. Only two
1.5V “AA” type penlite batteries power this exceedingly high-
input resistance (>1,000,000MΩ) 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.
+1.5V
22MΩ
3
10MΩ
+7
CA5420A
6
500-0-500
µA
M
100pF
2
-
4
±500mV
5
1
BATTERY
RETURNS
10kΩ
±150mV
-1.5V
±50mV
±15mV
1.5kΩ
1.5kΩ
1%
1kΩ
430Ω
1%
150Ω
1%
1.1kΩ
68Ω
1%
FIGURE 1. PICOAMMETER CIRCUIT
Typical Performance Curves
1.0
0.8
TA = 25oC
RL = 100kΩ
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
01
VO-
VO+
VICR-
VICR+
5 10
SUPPLY VOLTAGE (V)
15
FIGURE 3. OUTPUT VOLTAGE SWING AND COMMON MODE
INPUT VOLTAGE RANGE vs SUPPLY VOLTAGE
FIGURE 2. HIGH INPUT RESISTANCE VOLTMETER
10
TA = 25oC
V- = 0V
V+ = 2V
V+ = 5V
V+ = 10V
100 V+ = 20V
1000
0.001
0.1 1
LOAD (SOURCING) CURRENT (mA)
10
FIGURE 4. OUTPUT VOLTAGE vs LOAD SOURCING CURRENT
5
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| PDF Descargar | [ Datasheet CA5420A.PDF ] | |
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