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PDF OPA2227 Data sheet ( Hoja de datos )
| Número de pieza | OPA2227 | |
| Descripción | High Precision / Low Noise OPERATIONAL AMPLIFIERS | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OPA2227 (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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®
OPA4227
OPA227
OPA4227
OPA2227
OPA227
OPA2227
For most current data sheet and other product
information, visit www.burr-brown.com
High Precision, Low Noise
OPERATIONAL AMPLIFIERS
OPA227
OPA2227
OPA4227
OPA228
OPA2228
OPA4228
FEATURES
q LOW NOISE: 3nV/√Hz
q WIDE BANDWIDTH:
OPA227: 8MHz, 2.3V/µs
OPA228: 33MHz, 10V/µs
q SETTLING TIME: 5µs
(significant improvement over OP-27)
q HIGH CMRR: 138dB
q HIGH OPEN-LOOP GAIN: 160dB
q LOW INPUT BIAS CURRENT: 10nA max
q LOW OFFSET VOLTAGE: 75µV max
q WIDE SUPPLY RANGE: ±2.5V to ±18V
q OPA227 REPLACES OP-27, LT1007, MAX427
q OPA228 REPLACES OP-37, LT1037, MAX437
q SINGLE, DUAL, AND QUAD VERSIONS
APPLICATIONS
q DATA ACQUISITION
q TELECOM EQUIPMENT
q GEOPHYSICAL ANALYSIS
q VIBRATION ANALYSIS
q SPECTRAL ANALYSIS
q PROFESSIONAL AUDIO EQUIPMENT
q ACTIVE FILTERS
q POWER SUPPLY CONTROL
DESCRIPTION
The OPA227 and OPA228 series op amps combine
low noise and wide bandwidth with high precision to
make them the ideal choice for applications requiring
both ac and precision dc performance.
The OPA227 is unity gain stable and features high
slew rate (2.3V/µs) and wide bandwidth (8MHz). The
OPA228 is optimized for closed-loop gains of 5 or
greater, and offers higher speed with a slew rate of
10V/µs and a bandwidth of 33MHz.
The OPA227 and OPA228 series op amps are ideal
for professional audio equipment. In addition, low
quiescent current and low cost make them ideal for
portable applications requiring high precision.
The OPA227 and OPA228 series op amps are pin-
for-pin replacements for the industry standard OP-27
and OP-37 with substantial improvements across the
board. The dual and quad versions are available for
space savings and per-channel cost reduction.
The OPA227, OPA228, OPA2227, and OPA2228
are available in DIP-8 and SO-8 packages. The
OPA4227 and OPA4228 are available in DIP-14
and SO-14 packages with standard pin configura-
tions. Operation is specified from –40°C to +85°C.
OPA4227, OPA4228
SPICE Model available for OPA227 at www.burr-brown.com
OPA227, OPA228
Trim 1
–In 2
+In 3
V– 4
DIP-8, SO-8
8 Trim
OPA2227, OPA2228
7 V+
Out A 1
6 Output
5 NC
–In A 2
+In A 3
A
B
8
7
6
V– 4
5
Out A
–In A
+In A
V+
V+ +In B
Out B –In B
–In B Out B
+In B
1
2
3
4
5
6
7
AD
BC
DIP-14, SO-14
14 Out D
13 –In D
12 +In D
11 V–
10 +In C
9 –In C
8 Out C
DIP-8, SO-8
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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1998 Burr-Brown Corporation
PDS-1494B
Printed in U.S.A. May, 1999
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, RL = 10kΩ, and VS = ±15V, unless otherwise noted.
OPEN-LOOP GAIN/PHASE vs FREQUENCY
180 0
160
OPA227
–20
140
G
120
–40
–60
100
80 φ
–80
–100
60 –120
40 –140
20 –160
0 –180
–20
0.01 0.10 1
–200
10 100 1k 10k 100k 1M 10M 100M
Frequency (Hz)
OPEN-LOOP GAIN/PHASE vs FREQUENCY
180 0
160
OPA228
–20
140 –40
120 G
–60
100 –80
80 φ
–100
60 –120
40 –140
20 –160
0 –180
–20
0.01 0.10 1
–200
10 100 1k 10k 100k 1M 10M 100M
Frequency (Hz)
140
120
100
80
60
40
-20
–0
0.1
POWER SUPPLY AND COMMON-MODE
REJECTION RATIO vs FREQUENCY
+CMRR
+PSRR
–PSRR
1 10 100 1k 10k 100k 1M
Frequency (Hz)
100k
10k
1k
100
10
1
0.1
INPUT VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
Current Noise
Voltage Noise
1 10 100 1k 10k
Frequency (Hz)
0.01
0.001
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
VOUT = 3.5Vrms
OPA227
0.0001
G = 1, RL = 10kΩ
0.00001
20
100 1k
Frequency (Hz)
10k 20k
0.01
0.001
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
VOUT = 3.5Vrms
OPA228
0.0001
G = 1, RL = 10kΩ
0.00001
20
100 1k
Frequency (Hz)
10k 50k
OPA227, 2227, 4227
®
5 OPA228, 2228, 4228
5 Page 
APPLICATIONS INFORMATION
The OPA227 and OPA228 series are precision op amps with
very low noise. The OPA227 series is unity-gain stable with
a slew rate of 2.3V/µs and 8MHz bandwidth. The OPA228
series is optimized for higher-speed applications with gains
of 5 or greater, featuring a slew rate of 10V/µs and 33MHz
bandwidth. Applications with noisy or high impedance
power supplies may require decoupling capacitors close to
the device pins. In most cases, 0.1µF capacitors are ad-
equate.
OFFSET VOLTAGE AND DRIFT
The OPA227 and OPA228 series have very low offset
voltage and drift. To achieve highest dc precision, circuit
layout and mechanical conditions should be optimized.
Connections of dissimilar metals can generate thermal po-
tentials at the op amp inputs which can degrade the offset
voltage and drift. These thermocouple effects can exceed
the inherent drift of the amplifier and ultimately degrade its
performance. The thermal potentials can be made to cancel
by assuring that they are equal at both input terminals. In
addition:
• Keep thermal mass of the connections made to the two
input terminals similar.
• Locate heat sources as far as possible from the critical
input circuitry.
• Shield op amp and input circuitry from air currents such
as those created by cooling fans.
V+ Trim range exceeds
offset voltage specification
0.1µF
20kΩ
7
21
8
OPA227
36
4
0.1µF
V–
OPA227 and OPA228 single op amps only.
Use offset adjust pins only to
null offset voltage of op amp.
See text.
FIGURE 1. OPA227 Offset Voltage Trim Circuit.
amp. This adjustment should not be used to compensate for
offsets created elsewhere in the system since this can
introduce additional temperature drift.
INPUT PROTECTION
Back-to-back diodes (see Figure 2) are used for input protec-
tion on the OPA227 and OPA228. Exceeding the turn-on
threshold of these diodes, as in a pulse condition, can cause
current to flow through the input protection diodes due to the
amplifier’s finite slew rate. Without external current-limiting
resistors, the input devices can be destroyed. Sources of high
input current can cause subtle damage to the amplifier.
Although the unit may still be functional, important param-
eters such as input offset voltage, drift, and noise may shift.
OPERATING VOLTAGE
OPA227 and OPA228 series op amps operate from ±2.5V to
±18V supplies with excellent performance. Unlike most op
amps which are specified at only one supply voltage, the
RF
500Ω
–
OPA227 series is specified for real-world applications; a
single set of specifications applies over the ±5V to ±15V
supply range. Specifications are guaranteed for applications
between ±5V and ±15V power supplies. Some applications
do not require equal positive and negative output voltage
+
Input
OPA227
Output
swing. Power supply voltages do not need to be equal. The
OPA227 and OPA228 series can operate with as little as 5V
FIGURE 2. Pulsed Operation.
between the supplies and with up to 36V between the When using the OPA227 as a unity-gain buffer (follower), the
supplies. For example, the positive supply could be set to input current should be limited to 20mA. This can be accom-
25V with the negative supply at –5V or vice-versa. In plished by inserting a feedback resistor or a resistor in series
addition, key parameters are guaranteed over the specified
temperature range, –40°C to +85°C. Parameters which vary
significantly with operating voltage or temperature are shown
in the Typical Performance Curves.
OFFSET VOLTAGE ADJUSTMENT
with the source. Sufficient resistor size can be calculated:
RX = VS/20mA – RSOURCE
where RX is either in series with the source or inserted in
the feedback path. For example, for a 10V pulse (VS =
10V), total loop resistance must be 500Ω. If the source
impedance is large enough to sufficiently limit the current
The OPA227 and OPA228 series are laser-trimmed for on its own, no additional resistors are needed. The size of
very low offset and drift so most applications will not any external resistors must be carefully chosen since they
require external adjustment. However, the OPA227 and will increase noise. See the Noise Performance section of
OPA228 (single versions) provide offset voltage trim con- this data sheet for further information on noise calcula-
nections on pins 1 and 8. Offset voltage can be adjusted by tion. Figure 2 shows an example implementing a current-
connecting a potentiometer as shown in Figure 1. This limiting feedback resistor.
adjustment should be used only to null the offset of the op
OPA227, 2227, 4227
®
11 OPA228, 2228, 4228
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet OPA2227.PDF ] | |
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