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CA5160 Arkusz danych(PDF) 5 Page - Intersil Corporation

Numer części CA5160
Szczegółowy opis  4MHz, BiMOS Microprocessor Operational Amplifier with MOSFET Input/CMOS Output
Download  19 Pages
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Producent  INTERSIL [Intersil Corporation]
Strona internetowa  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

CA5160 Arkusz danych(HTML) 5 Page - Intersil Corporation

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5
Schematic Diagram
Application Information
Circuit Description
Refer to the block diagram of the CA5160 CMOS
Operational Amplifier. The input terminals may be operated
down to 0.5V below the negative supply rail, and the output
can be swung very close to either supply rail in many
applications. Consequently, the CA5160 circuit is ideal for
single supply operation. Three class A amplifier stages,
having the individual gain capability and current
consumption shown in the block diagram, provide the total
gain of the CA5160. A biasing circuit provides two potentials
for common use in the first and second stages. Terminals 8
and 1 can be used to supplement the internal phase
compensation network if additional phase compensation or
frequency roll-off is desired. Terminals 8 and 4 can also be
used to strobe the output stage into a low quiescent current
state. When Terminal 8 is tied to the negative supply rail
(Terminal 4) by mechanical or electrical means, the output
potential at Terminal 6 essentially rises to the positive supply
rail potential at Terminal 7. This condition of essentially zero
current drain in the output stage under the strobed “OFF”
condition can only be achieved when the ohmic load
resistance presented to the amplifier is very high (e.g., when
the amplifier output is used to drive CMOS digital circuits in
comparator applications).
Input Stages
The circuit of the CA5160 is shown in the schematic diagram.
It consists of a differential input stage using PMOS field effect
transistors (Q6, Q7) working into a mirror pair of bipolar
transistors (Q9, Q10) functioning as load resistors together
with resistors R3 through R6. The mirror pair transistors also
function as a differential-to-single-ended converter to provide
base drive to the second-stage bipolar transistor (Q11). Offset
nulling, when desired, can be effected by connecting a
100,000
Ω potentiometer across Terminals 1 and 5 and the
potentiometer slider arm to Terminal 4.
Cascode-connected PMOS transistors Q2, Q4, are the
constant current source for the input stage. The biasing
circuit for the constant current source is subsequently
described. The small diodes D5 through D7 provide gate-
oxide protection against high voltage transients, including
static electricity during handling for Q6 and Q7.
7
4
8
1
5
2
3
BIAS CIRCUIT
“CURRENT SOURCE
LOAD” FOR Q11
Q2
D1
D2
D3
D4
Z1
8.3V
Q1
R1
40k
Q4
R2
5k
INPUT STAGE
D5
NON-INV.
INPUT
INV. INPUT
+
-
Q6
R3
1k
Q9
Q10
R5
1k
R6
1k
R4
1k
Q7
D6
D7
Q3
OFFSET NULL
Q11
SUPPLEMENTARY
COMP IF DESIRED
STROBING
SECOND
OUTPUT
Q8
Q12
STAGE
STAGE
Q5
V+
2k
30
pF
6
OUTPUT
CURRENT SOURCE
FOR Q6 AND Q7
NOTE: Diodes D5 through D7 provide gate oxide protection for MOSFET Input Stage.
CA5160


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