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Número de pieza | OPA637BP | |
Descripción | Precision High-Speed Difet OPERATIONAL AMPLIFIERS | |
Fabricantes | Burr-Brown | |
Logotipo | ![]() |
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®
OPA627
OPA627
OPA627
OPA637
Precision High-Speed
Difet ® OPERATIONAL AMPLIFIERS
FEATURES
q VERY LOW NOISE: 4.5nV/√Hz at 10kHz
q FAST SETTLING TIME:
OPA627—550ns to 0.01%
OPA637—450ns to 0.01%
q LOW VOS: 100µV max
q LOW DRIFT: 0.8µV/°C max
q LOW IB: 5pA max
q OPA627: Unity-Gain Stable
q OPA637: Stable in Gain ≥ 5
APPLICATIONS
q PRECISION INSTRUMENTATION
q FAST DATA ACQUISITION
q DAC OUTPUT AMPLIFIER
q OPTOELECTRONICS
q SONAR, ULTRASOUND
q HIGH-IMPEDANCE SENSOR AMPS
q HIGH-PERFORMANCE AUDIO CIRCUITRY
q ACTIVE FILTERS
DESCRIPTION
The OPA627 and OPA637 Difet operational amplifi-
ers provide a new level of performance in a precision
FET op amp. When compared to the popular OPA111
op amp, the OPA627/637 has lower noise, lower offset
voltage, and much higher speed. It is useful in a broad
range of precision and high speed analog circuitry.
The OPA627/637 is fabricated on a high-speed, dielec-
trically-isolated complementary NPN/PNP process. It
operates over a wide range of power supply voltage—
±4.5V to ±18V. Laser-trimmed Difet input circuitry
provides high accuracy and low-noise performance
comparable with the best bipolar-input op amps.
High frequency complementary transistors allow in-
creased circuit bandwidth, attaining dynamic perform-
ance not possible with previous precision FET op
amps. The OPA627 is unity-gain stable. The OPA637
is stable in gains equal to or greater than five.
Difet fabrication achieves extremely low input bias
currents without compromising input voltage noise
performance. Low input bias current is maintained
over a wide input common-mode voltage range with
unique cascode circuitry.
The OPA627/637 is available in plastic DIP, SOIC
and metal TO-99 packages. Industrial and military
temperature range models are available.
Trim
1
Trim
5
7
+VS
Output
6
+In –In
32
Difet ®, Burr-Brown Corp.
–VS
4
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1989 Burr-Brown Corporation
PDS-998H
Printed in U.S.A. March, 1998
1 page ![]() ![]() TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, and VS = ±15V, unless otherwise noted.
OPEN-LOOP GAIN vs TEMPERATURE
125
120
115
110
105
–75 –50 –25
0 25 50 75
Temperature (°C)
100 125
OPEN-LOOP OUTPUT IMPEDANCE vs FREQUENCY
100
80
60
40
20
0
2
20 200 2k
20k 200k 2M 20M
Frequency (Hz)
140
120
100
80
60
40
20
0
1
COMMON-MODE REJECTION vs FREQUENCY
OPA637
OPA627
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
COMMON-MODE REJECTION vs
INPUT COMMON MODE VOLTAGE
130
120
110
100
90
80
–15
–10 –5
0
5
Common-Mode Voltage (V)
10
15
POWER-SUPPLY REJECTION vs FREQUENCY
140
120
100
–VS PSRR 627
80 and 637
60
40
+VS PSRR 627
637
20
0
1 10 100 1k 10k 100k 1M 10M
Frequency (Hz)
POWER-SUPPLY REJECTION AND COMMON-MODE
REJECTION vs TEMPERATURE
125
PSR
120
115 CMR
110
105
–75 –50 –25
0 25 50
Temperature (°C)
75 100 125
®
5 OPA627, 637
5 Page ![]() ![]() INPUT PROTECTION
The inputs of the OPA627/637 are protected for voltages
between +VS + 2V and –VS – 2V. If the input voltage can
exceed these limits, the amplifier should be protected. The
diode clamps shown in Figure 7a will prevent the input
voltage from exceeding one forward diode voltage drop
beyond the power supplies—well within the safe limits. If
the input source can deliver current in excess of the maxi-
mum forward current of the protection diodes, use a series
resistor, RS, to limit the current. Be aware that adding
resistance to the input will increase noise. The 4nV/√Hz
theoretical thermal noise of a 1kΩ resistor will add to the
4.5nV/√Hz noise of the OPA627/637 (by the square-root of
the sum of the squares), producing a total noise of 6nV/√Hz.
Resistors below 100Ω add negligible noise.
Leakage current in the protection diodes can increase the
total input bias current of the circuit. The specified maxi-
mum leakage current for commonly used diodes such as the
1N4148 is approximately 25nA—more than a thousand
times larger than the input bias current of the OPA627/637.
Leakage current of these diodes is typically much lower and
may be adequate in many applications. Light falling on the
junction of the protection diodes can dramatically increase
leakage current, so common glass-packaged diodes should
be shielded from ambient light. Very low leakage can be
achieved by using a diode-connected FET as shown. The
2N4117A is specified at 1pA and its metal case shields the
junction from light.
Sometimes input protection is required on I/V converters of
inverting amplifiers (Figure 7b). Although in normal opera-
tion, the voltage at the summing junction will be near zero
(equal to the offset voltage of the amplifier), large input
transients may cause this node to exceed 2V beyond the
power supplies. In this case, the summing junction should
be protected with diode clamps connected to ground. Even
with the low voltage present at the summing junction,
common signal diodes may have excessive leakage current.
Since the reverse voltage on these diodes is clamped, a
diode-connected signal transistor can be used as an inexpen-
sive low leakage diode (Figure 7b).
+VS
D
D
Optional RS
–VS
(a)
–
VO
+ OPA627
D: IN4148 — 25nA Leakage
2N4117A — 1pA Leakage
Siliconix
=
IIN
DD
(b)
–
VO
+ OPA627
D: 2N3904
=
NC
FIGURE 7. Input Protection Circuits.
LARGE SIGNAL RESPONSE
SMALL SIGNAL RESPONSE
FPO
(A)
(B)
When used as a unity-gain buffer, large common-mode input voltage steps
produce transient variations in input-stage currents. This causes the rising
edge to be slower and falling edges to be faster than nominal slew rates
observed in higher-gain circuits.
FIGURE 8. OPA627 Dynamic Performance, G = +1.
– G=1
+
OPA627
®
11 OPA627, 637
11 Page |
Páginas | Total 13 Páginas | |
PDF Descargar | [ Datasheet OPA637BP.PDF ] |
Número de pieza | Descripción | Fabricantes |
OPA637BM | Precision High-Speed Difet OPERATIONAL AMPLIFIERS | ![]() Burr-Brown |
OPA637BP | Precision High-Speed Difet OPERATIONAL AMPLIFIERS | ![]() Burr-Brown |
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