|
|
PDF OPA622 Data sheet ( Hoja de datos )
| Número de pieza | OPA622 | |
| Descripción | Wide-Bandwidth OPERATIONAL AMPLIFIER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de OPA622 (archivo pdf) en la parte inferior de esta página. Total 19 Páginas | ||
|
No Preview Available !
OPA622
®
OPA622
OPA622
Wide-Bandwidth
OPERATIONAL AMPLIFIER
FEATURES
q LARGE SIGNAL BANDWIDTH:
150MHz (AP), 200MHz (AU)
(Voltage-Feedback)
q HIGH OUTPUT CURRENT: ±70mA
q SLEW RATE: 1500V/µs (AP), 1700V/µs (AU)
q DIFFERENTIAL GAIN: 0.15%
q DIFFERENTIAL PHASE: 0.08°
q EXCELLENT BANDWIDTH/SUPPLY
CURRENT RATIO: 200MHz/5mA
q LOW INPUT BIAS CURRENT: –1.2µA
DESCRIPTION
The OPA622 is a monolithic amplifier component
designed for precision wide-bandwidth systems
including high-resolution video, RF and IF circuitry,
and communications equipment. It includes a mono-
lithic integrated current-feedback operational
amplifier block and a voltage buffer block, which,
when combined, form a voltage-feedback operational
amplifier.
When combined as a current-feedback amplifier, it
provides a 280MHz large-signal bandwidth at ±2.5V
output level and a 1700V/µs slew rate. The output
buffer stage can deliver ±70mA output current. The
high output current capability allows the OPA622 to
drive two 50Ω or 75Ω lines with ±3V output swing,
making it ideal along with the low differential
gain/phase errors for RF, IF, and video applications.
APPLICATIONS
q BROADCAST/HDTV EQUIPMENT
q COMMUNICATIONS
q PULSE/RF AMPLIFIERS
q ACTIVE FILTER
q HIGH SPEED ANALOG SIGNAL
PROCESSING
q MULTIPLIER OUTPUT AMP
q DIFFERENTIATOR FOR DIGITIZED
VIDEO SIGNALS
The feedback buffer stage provides 700MHz band-
width, a very high slew rate, and a very short signal
delay time. It is designed primarily for interstage
buffering and not for driving long cables. When com-
bined with the current-feedback amplifier section, the
OPA622 can be interconnected as a voltage-feedback
amplifier with two identical high-impedance inputs.
In this configuration, it features a low common-mode
gain, low input offset, and, due to the delay time of the
additional feedback buffer, a decrease in frequency
bandwidth compared with the current-feedback
configuration. Unlike “classical” operational amplifi-
ers, the OPA622 achieves a nearly constant bandwidth
over a wide gain and output voltage range. The
external setting of the open-loop gain with R avoids
OG
a large compensation capacitor, improves the slew
rate, and allows a frequency response adaption to
various gains and load conditions.
R2 VOLTAGE-FEEDBACK
CURRENT-FEEDBACK
R2
R1 3
COTA
10
RIN
–In
OPA622
4 VFA
9
8
50Ω
VOUT
VIN +In BUF–
13
50Ω 2 BUF+
ROG
IQ
Adjust
RQ
–5V
R1 COTA
13
VIN
10
RIN
BUF+
4
OPA622
CFA
3
9
+In
50Ω
VOUT
50Ω 2 100Ω
IQ
Adjust
RQ
–5V
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 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1991 Burr-Brown Corporation
PDS-1131E
Printed in U.S.A. March, 1995
1 page  
TYPICAL PERFORMANCE CURVES
VOLTAGE-FEEDBACK AMPLIFIER (Figure 5)
At VCC = ±5V, IQ = ±5mA, GCL = +2V/V, RLOAD = 100Ω, RSOURCE = 50Ω, RQ = 430Ω, ROG = 150Ω and TA = +25°C, unless otherwise specified.
INPUT BIAS CURRENT vs TEMPERATURE
0
CLOSED-LOOP OUTPUT OFFSET VOLTAGE
vs TEMPERATURE
15
–0.2
–0.4
–0.6
–0.8
–1
–1.2
Input Bias Offset Current
Positive Input Bias Current
Negative Input Bias Current
10
5
0
GCL = +2V/V
–5
–10
–1.4
–40
–20
0 20 40 60
Temperature (°C)
80 100
–15
–40
–20
0 20 40 60
Temperature (°C)
80
100
100
90
80
70
60
50
40
30
20
10
0
0
INPUT OFFSET VOLTAGE vs TIME
SO-14
DIP
12345
Time (minutes)
6
INPUT STAGE OFFSET VOLTAGE vs TEMPERATURE
0.5
0
–0.5
–1
–1.5
Input Offset Voltage
Negative Input Voltage
Positive Input Voltage
–2
–40
–20
0 20 40 60
Temperature (°C)
80 100
QUIESCENT CURRENT vs RQ RESISTANCE
9
8
7
6
5
4
3
2
0 200 400 600 800 1000 1200
RQ (Ω)
9
8
7
6
5
4
3
2
1
0
–40
QUIESCENT CURRENT vs TEMPERATURE
–20 0
20 40 60 80
Temperature (°C)
100
®
5 OPA622
5 Page 
Application circuits generally do not show the resistor
RQ, but it is required for proper operation.
With a fixed RQ, the quiescent current increases with tem-
perature (see Typical Performance Curves.) This variation
of the quiescent current with temperature keeps the band-
width and AC behavior relatively constant with temperature.
It is also possible to vary the quiescent current by an external
control signal or circuitry. Figure 3 shows a circuit to disable
the OPA622 with TTL-compatible logic levels. 0V/5V logic
levels are converted into a 1mA/0mA current connected to
Pin 2. The current flowing in RQ increases the voltage at Pin
2 to approximately 1V above the –VCC rail, thus reducing IQ
to near zero and disabling the OPA622.
OTA AND OUTPUT BUFFER SECTIONS
An Operational Transconductance Amplifier (OTA) and an
output buffer are the basic building blocks of a current-
feedback amplifier. The current-feedback configuration of
the OPA622 is illustrated in Figure 4. The OTA consists of
a complementary emitter follower and a subsequent comple-
mentary current mirror. The voltage at the high-impedance
+In terminal is transferred to the BUF+ input/output termi-
nal at a low impedance. If a current flows into or out of the
BUF+ terminal, the complementary mirror reflects the
current to the OTA terminal. The current flow at the high-
impedance OTA terminal is determined by the product of
the voltage between the +In and BUF+ terminals and the
transconductance. The output buffer section is an open-loop
buffer consisting of complementary emitter followers. It is
designed to drive cables or low-impedance loads. The buffer
output is not current-limited or -protected. As can be seen in
Figure 4, the feedback network for a current-feedback
amplifier is applied between the VOUT and BUF+ terminals.
Figure 8 illustrates the bandwidth for various output volt-
ages of the current feedback configuration.
+5V
4.7kΩ
0/5V
Logic In
5V: OPA622 On
2N2907
IC
Internal
Current Source
Circuitry
OPA622
100Ω
100kΩ
25
IC = 0: OPA622 On
IC = 1mA: OPA622 Off
RQ
430Ω
–5V
FIGURE 3. Logic-Controlled Disable Circuit.
FEEDBACK BUFFER SECTION
This section of the OPA622 is a complementary emitter
follower identical to the input buffer of the OTA section. It
is designed for interstage buffering, not for driving long
cables or low-impedance loads. A minimum load resistance
of 500Ω is recommended when using the feedback buffer as
a stand-alone device. The feedback buffer output is not
current-limited or -protected. The bandwidth of the feedback
buffer is shown in Figure 7.
+VCC
12
+In 4
OTA
COTA
13
BUF+
+ VCC OUT
10
R1
11
OB
6
9
–VCC OUT
R2
–VCC
5
FIGURE 4. Current-Feedback Amplifier.
VOUT
11 OPA622
®
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet OPA622.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| OPA620 | Wideband Precision Operational Amplifier |  Texas Instruments |
| OPA620 | Wideband Precision OPERATIONAL AMPLIFIER | Burr-Brown |
| OPA621 | Wideband Precision Operational Amplifier | Texas Instruments |
| OPA621 | Wideband Precision OPERATIONAL AMPLIFIER | Burr-Brown |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |