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CA5420A
Data Sheet
December 8, 2009
FN1925.6
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 +10°C 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 -55°C to +125°C.
The CA5420A has the same 8 lead pinout used for the
industry standard 741.
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 +85°C)
• Rail-to-Rail Output Swing (Drive
±2mA
Into 1kΩ Load)
• Pin Compatible with 741 Op Amp
• Pb-Free Available (RoHS Compliant)
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
Functional Diagram
X1
MOS
BIPOLAR
+
-
MOS
BIPOLAR
X1
BUFFER AMPS;
BOOTSTRAPPED
INPUT PROTECTION
NETWORK
HIGH GAIN
(50k)
OTA BUFFER
(X2)
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. 1998, 2005, 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
CA5420A
Ordering Information
PART NUMBER
(Note 3)
CA5420AM
CA5420AMZ (Notes 1, 2)
NOTES:
1. Add “96” suffix for Tape and Reel. Please refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free 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.
3. For Moisture Sensitivity Level (MSL), please see device information page for
CA5420A.
For more information on MSL please see techbrief
TB363.
5420A
5420 AMZ
PART
MARKING
TEMP. RANGE
(°C)
-55 to +125
-55 to +125
PACKAGE
(Pb-Free)
8 Ld SOIC
8 Ld SOIC
(Tape and Reel)
PKG.
DWG. #
M8.15
M8.15
Pinout
CA5420A
(8 LD SOIC)
TOP VIEW
OFFSET 1
NULL
INV.
2
INPUT
NON-INV. 3
INPUT
V- 4
8 STROBE
-
+
7 V+
6 OUTPUT
5 OFFSET
NULL
NOTE: Pin is connected to Case.
2
FN1925.6
December 8, 2009
CA5420A
Absolute Maximun Ratings
Supply Voltage (Between V+ and V- Terminals) . . . . . . . . . . . . 22V
Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . (V+ + 8V) to (V- -0.5V)
Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1mA
Output Short Circuit Duration (Note 4). . . . . . . . . . . . . . . . Indefinite
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . -55°C to +125°C
Thermal Information
Thermal Resistance (Typical, Note 5)
θ
JA
(°C/W)
θ
JC
(°C/W)
SOIC Package . . . . . . . . . . . . . . . . . . .
157
N/A
Maximum Junction Temperature (Plastic Package) . . . . . . +150°C
Maximum Storage Temperature Range (All Types) . . -65°C to +150°C
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
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:
4. Short circuit may be applied to ground or to either supply.
5.
θ
JA
is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
PARAMETER
Input Resistance
Input Capacitance
Output Resistance
Equivalent Input
Noise Voltage
Short-Circuit Current To
Opposite Supply
Gain Bandwidth Product
Slew Rate
Transient Response
Typical Values Intended Only for Design Guidance. V+ = +5V; V- = GND, T
A
= +25°C
SYMBOL
R
I
C
I
R
O
e
N
f = 1kHz
f = 10kHz
Source
Sink
I
OM
+
I
OM
-
f
T
SR
Rise Time
Overshoot
t
r
OS
I
8
+
I
8
-
0.01%
0.10%
A
V
= 1
A
V
= 1
2V
P-P
Input
2V
P-P
Input
R
L
= 2kΩ, C
L
= 100pF
R
S
= 100Ω
TEST CONDITIONS
CA5420A
150
4.9
300
62
38
2.6
2.4
0.5
0.5
0.7
15
20
2
8
4.5
UNITS
TΩ
pF
Ω
nV/√Hz
nV/√Hz
mA
mA
MHz
V/µs
µs
%
µA
mA
µs
µs
Current from Terminal 8 To V-
Current from Terminal 8 To V+
Settling Time
+
Electrical Specifications
PARAMETER
Input Offset Voltage
Input Offset Current
Input Current
Common Mode Rejection Ratio
T
A
= +25
°C
, V+ = 5V, V- = 0, Unless Otherwise Specified
TEST
CONDITIONS
V
O
= 2.5V
V
O
= 2.5V
V
O
= 2.5V
V
CM
= 0 to 3.7V, V
O
= 2.5V
V
O
= 2.5V
ΔV+
= 1V;
ΔV-
= 1V
R
L
=
∞
R
L
= 10kΩ
R
L
= 2kΩ
I
SOURCE
I
SINK
V
O
= 0V
V
O
= 5V
CA5420A
MIN
-
-
-
75
3.7
-
75
TYP
1
0.02
0.02
83
4
-0.3
83
MAX
5
4
5
-
-
0
-
UNITS
mV
pA
pA
dB
V
V
dB
SYMBOL
V
IO
I
IO
I
I
CMRR
V
lCR
+
V
lCR
-
Common Mode Input Voltage Range
Power Supply Rejection Ratio
Large Signal Voltage Gain
V
O
= 0.5 to 4V
V
O
= 0.5 to 4V
V
O
= 0.7 to 3V
Source Current
Sink Current
PSRR
A
OL
85
85
80
1.2
1.2
87
87
85
2.7
2.1
-
-
-
-
-
dB
dB
dB
mA
mA
3
FN1925.6
December 8, 2009
CA5420A
Electrical Specifications
PARAMETER
Output Voltage
T
A
= +25
°C
, V+ = 5V, V- = 0, Unless Otherwise Specified
(Continued)
TEST
CONDITIONS
R
L
=
∞
CA5420A
MIN
4.85
-
R
L
= 10kΩ
4.7
-
R
L
= 2kΩ
3.5
-
V
O
= 0V
V
O
= 2.5V
-
-
TYP
4.94
0.13
4.9
0.12
4.6
0.1
400
430
MAX
-
0.15
-
0.15
-
0.15
500
550
UNITS
V
V
V
V
V
V
µ
A
µ
A
SYMBOL
V
OM
+
V
OM
-
V
OM
+
V
OM
-
V
OM
+
V
OM
-
Supply Current
I
SUPPLY
Electrical Specifications
T
A
= -55
°C
to +125
°C
, V+ = 5V, V- = 0, Unless Otherwise Specified
CA5420A
PARAMETER
Input Offset Voltage
Input Offset Current
Up to T
A
= +85°C
Input Current
Up to T
A
= +85°C
Common Mode Rejection Ratio
Common Mode Input Voltage Range
SYMBOL
V
IO
I
IO
|I
I
|
TEST
CONDITIONS
V
O
= 2.5V
V
O
= 2.5V
MIN
(Note 6)
-
-
-
TYP
2
1.5
2
2
10
80
4
-0.3
83
MAX
(Note 6)
10
3
10
5
15
-
-
0
-
UNITS
mV
nA
pA
nA
pA
dB
V
V
dB
V
O
= 2.5V
-
-
CMRR
V
lCR
+
V
lCR
-
V
CM
= 0 to 3.7V,
V
O
= 2.5V
V
O
= 2.5V
ΔV+
= 1V;
ΔV-
= 1V
R
L
=
∞
R
L
= 10kΩ
R
L
= 2kΩ
70
3.7
-
70
Power Supply Rejection Ratio
Large Signal Voltage Gain
V
O
= 0.5 to 4V
V
O
= 0.7 to 4V
V
O
= 0.7 to 2.5V
Source Current
Sink Current
Output Voltage
PSRR
A
OL
65
80
75
1
1
4.8
-
75
87
80
2.7
2.1
4.9
0.16
4.9
0.15
4
0.14
430
480
-
-
-
-
-
-
0.2
-
0.2
-
0.2
550
600
dB
dB
dB
mA
mA
V
V
V
V
V
V
µ
A
µ
A
I
SOURCE
I
SINK
V
OM
+
V
OM
-
V
OM
+
V
OM
-
V
OM
+
V
OM
-
V
O
= 0V
V
O
= 5V
R
L
=
∞
R
L
= 10kΩ
4.7
-
R
L
= 2kΩ
3
-
Supply Current
I
SUPPLY
V
O
= 0V
V
O
= 2.5V
-
-
4
FN1925.6
December 8, 2009
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