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PDF HCA10014 Data sheet ( Hoja de datos )
| Número de pieza | HCA10014 | |
| Descripción | 15MHz/ BiMOS Operational Amplifier with MOSFET Input/CMOS Output | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
HCA10014
August 1999
File Number 4769
15MHz, BiMOS Operational Amplifier with
MOSFET Input/CMOS Output
HCA10014 op amp combines the advantage of both CMOS
and bipolar transistors.
Gate protected P-Channel MOSFET (PMOS) transistors are
used in the input circuit to provide very high input
impedance, very low input current, and exceptional speed
performance. The use of PMOS transistors in the input stage
results in common mode input voltage capability down to
0.5V below the negative supply terminal, an important
attribute in single supply applications.
A CMOS transistor pair, capable of swinging the output
voltage to within 10mV of either supply voltage terminal (at
very high values of load impedance), is employed as the
output circuit.
The HCA10014 operates at supply voltages ranging from 5V
to 16V, (±2.5V to ±8V). It can be phase compensated with a
single external capacitor, and have terminals for adjustment
of offset voltage for applications requiring offset null
capability. Terminal provisions are also made to permit
strobing of the output stage.
Pinout
HCA10014
(SOIC)
TOP VIEW
OFFSET
NULL
INV.
INPUT
NON-INV.
INPUT
V-
1
2
3
4
-
+
8 STROBE
7 V+
6 OUTPUT
5 OFFSET
NULL
Features
• MOSFET Input Stage Provides:
- Very High ZI = 1.5TΩ (1.5 x 1012Ω) (Typ)
- Very Low II
15V Operation. . . . . . . . . . . . . . . . . . . . . . . . . 5pA (Typ)
5V Operation. . . . . . . . . . . . . . . . . . . . . . . . . . 2pA (Typ)
• Ideal for Single Supply Applications
• Common Mode Input Voltage Range Includes
Negative Supply Rail; Input Terminals can be Swung 0.5V
Below Negative Supply Rail
• CMOS Output Stage Permits Signal Swing to Either (or
both) Supply Rails
Applications
• Ground Referenced Single Supply Amplifiers
• Fast Sample and Hold Amplifiers
• Long Duration Timers/Monostables
• High Input Impedance Comparators
(Ideal Interface with Digital CMOS)
• High Input Impedance Wideband Amplifiers
• Voltage Followers (e.g., Follower for Single Supply D/A
Converter)
• Voltage Regulators (Permits Control of Output Voltage
Down to 0V)
• Peak Detectors
• Single Supply Full Wave Precision Rectifiers
• Photo Diode Sensor Amplifiers
Ordering Information
PART NO.
(BRAND)
HCA10014
TEMP.
RANGE (oC)
PACKAGE
-55 to 125 8 Ld SOIC
Tape and Reel
PKG. NO.
M8.15
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
1 page  
HCA10014
Schematic Diagram
BIAS CIRCUIT
CURRENT SOURCE FOR
Q6 AND Q7
Q1
Z1
8.3V
R1
D1
D2
D3
D4
40kΩ R2
5kΩ
Q2
Q4
NON-INV.
INPUT
3+
INV.-INPUT
2
-
INPUT STAGE
D5 D6
(NOTE 4) D7
D8
Q6 Q7
R3
1kΩ
Q9 Q10
R4
1kΩ
R5 R6
1kΩ 1kΩ
“CURRENT SOURCE
LOAD” FOR Q11
Q3
Q5
SECOND
STAGE
Q11
OUTPUT
STAGE
7 V+
Q8
OUTPUT
6
Q12
5 OFFSET NULL 1
COMPENSATION
NOTE:
4. Diodes D5 through D8 provide gate-oxide protection for MOSFET input stage.
8 STROBING 4 V-
Application Information
Circuit Description
Figure 7 is a block diagram of the HCA10014. 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
HCA10014 is ideal for single supply operation. Three
Class A amplifier stages, having the individual gain
capability and current consumption shown in Figure 7,
provide the total gain of the HCA10014. A biasing circuit
provides two potentials for common use in the first and
second stages. Terminal 8 can be used both for phase
compensation and to strobe the output stage into
quiescence. 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 Stage
The circuit 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 100,000Ω
potentiometer across Terminals 1 and 5 and the
potentiometer slider arm to Terminal 4. Cascade 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
5
5 Page 
HCA10014
+15V
10kΩ
3+
0.01µF
7
6
2-
4
5
1
8 100kΩ
56pF
OFFSET
ADJUST
2kΩ
0.1µF
Top Trace: Output; 5V/Div., 200µs/Div.
Bottom Trace: Input Signal; 5V/Div., 200µs/Div.
FIGURE 15A. OUTPUT WAVEFORM WITH INPUT SIGNAL
RAMPING (2V/DIV., 500µs/DIV.)
FIGURE 15B. OUTPUT WAVEFORM WITH GROUND
REFERENCE SINEWAVE INPUT
FIGURE 15. SINGLE SUPPLY VOLTAGE FOLLOWER WITH ASSOCIATED WAVEFORMS. (e.g., FOR USE IN SINGLE SUPPLY D/A
CONVERTER; SEE FIGURE 9 IN AN6080)
11
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| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet HCA10014.PDF ] | |
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