5420AMZ 查看數據表（PDF） - Renesas Electronics
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5420AMZ
Renesas Electronics
5420AMZ Datasheet PDF : 9 Pages
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DATASHEET
CA5420A
0.5MHz, Low Supply Voltage, Low Input Current BiMOS Operational Amplifiers
FN1925
Rev 9.00
February 11, 2015
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 350µA 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 (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
FN1925 Rev 9.00
February 11, 2015
X1
-
BiMOS
+
BiMOS
X1
BUFFER AMPS;
BOOTSTRAPPED
INPUT PROTECTION
NETWORK
HIGH GAIN
(50k)
TA BUFER
(X2)
FIGURE 1. FUNCTIONAL DIAGRAM
Page 1 of 9
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