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Número de pieza | OPA635 | |
Descripción | Wideband / Single Supply OPERATIONAL AMPLIFIERS | |
Fabricantes | Burr-Brown | |
Logotipo | ||
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OPA634
OPA634
OPA635
For most current data sheet and other product
information, visit www.burr-brown.com
TM Wideband, Single Supply
OPERATIONAL AMPLIFIERS
FEATURES
q HIGH BANDWIDTH: 150MHz (G = +2)
q +3V AND +5V OPERATION
q ZERO POWER DISABLE (OPA635)
q INPUT RANGE INCLUDES GROUND
q 4.8V OUTPUT SWING ON +5V SUPPLY
q HIGH OUTPUT CURRENT: 80mA
q HIGH SLEW RATE: 250V/µs
q LOW INPUT VOLTAGE NOISE: 5.6nV/√HZ
q AVAILABLE IN SOT23 PACKAGES
APPLICATIONS
q SINGLE SUPPLY ADC INPUT BUFFER
q SINGLE SUPPLY VIDEO LINE DRIVER
q WIRELESS LAN IF AMPLIFIER
q CCD IMAGING CHANNELS
q LOW POWER ULTRASOUND
DESCRIPTION
The OPA634 and OPA635 are low power, voltage-
feedback, high-speed amplifiers designed to operate on
+3V or +5V single-supply voltages. Operation on ±5V
or +10V supplies is also supported. The input range
extends below ground and to within 1.2V of the positive
supply. Using complementary common-emitter outputs
provides an output swing to within 30mV of ground and
140mV of positive supply. The high output drive cur-
rent, low differential gain and phase errors make them
ideal for single-supply composite video line driving.
Low distortion operation is ensured by the high gain
bandwidth (140MHz) and slew rate (250V/µs). This
makes the OPA634 and OPA635 ideal input buffer
stages to 3V and 5V CMOS converters. Unlike other low
power, single-supply operational amplifiers, distortion
performance improves as the signal swing is decreased.
A low 5.6nV input voltage noise supports wide dynamic
range operation. Multiplexing or system power reduc-
tion can be achieved using the high-speed disable line
with the OPA635. Power dissipation can be reduced to
zero by taking the disable line High.
The OPA634 and OPA635 are available in an industry
standard SO-8 package. The OPA634 is also available in
an ultra-small SOT23-5 package, while the OPA635 is
available in the SOT23-6. Where lower supply current
and speed are required, consider the OPA631 and
OPA632.
RELATED PRODUCTS
SINGLES
DUALS
Medium Speed, No Disable
With Disable
OPA631
OPA632
OPA2631
—
High Speed, No Disable
With Disable
OPA634
OPA635
OPA2634
—
+3V
2.26kΩ
Disable
+3V
374Ω
VIN
562Ω
DIS
OPA635
Pwrdn
100Ω
750Ω
22pF
ADS900
10-Bit
20Msps
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
© 1999 Burr-Brown Corporation
PDS-1465A
Printed in U.S.A. June, 1999
1 page TYPICAL PERFORMANCE CURVES: VS = +5V
At TA = 25°C, G = +2, RF = 750Ω, and RL = 150Ω to VS/2, unless otherwise noted (see Figure 1).
SMALL-SIGNAL FREQUENCY RESPONSE
6
VO = 0.2Vp-p
3
G = +2
0
G = +5
–3
–6
–9
G = +10
–12
–15
–18
1
10 100 300
Frequency (MHz)
12
9
6
3
0
–3
–6
–9
–12
1
LARGE-SIGNAL FREQUENCY RESPONSE
VO = 0.2Vp-p
VO = 1Vp-p
VO = 2Vp-p
VO = 4Vp-p
10 100 300
Frequency (MHz)
SMALL-SIGNAL PULSE RESPONSE
VO = 200mVp-p
VO
VIN
LARGE-SIGNAL DISABLE/ENABLE RESPONSE
VO = 2Vp-p
VO
VIN
Time (10ns/div)
Time (10ns/div)
LARGE-SIGNAL DISABLE/ENABLE RESPONSE
VDIS
VO
VIN = 0.5V
OPA635 only
Time (50ns/div)
DISABLE FEEDTHROUGH vs FREQUENCY
–35
OPA635 only
–40 VDIS = +5V
–45
–50
–55
–60
–65
–70
–75
–80
–85
1
10 100
Frequency (MHz)
1000
®
5 OPA634, OPA635
5 Page APPLICATIONS INFORMATION
WIDEBAND VOLTAGE FEEDBACK OPERATION
The OPA634 and OPA635 are unity-gain stable, very high
speed voltage feedback op amps designed for single supply
operation (+3V to +5V). The input stage supports input
voltages below ground, and within 1.2V of the positive
supply. The complementary common-emitter output stage
provides an output swing to within 30mV of ground and
140mV of the positive supply. They are compensated to
provide stable operation with a wide range of resistive loads.
The OPA635’s internal disable circuitry is designed to
minimize supply current when disabled.
Figure 1 shows the AC-coupled, gain of +2 configuration
used for the +5V Specifications and Typical Performance
Curves. For test purposes, the input impedance is set to 50Ω
with a resistor to ground. Voltage swings reported in the
Specifications are taken directly at the input and output pins.
For the circuit of Figure 1, the total effective load on the
output at high frequencies is 150Ω || 1500Ω. The disable pin
needs to be driven by a low impedance source, such as a
CMOS inverter. The 1.50kΩ resistors at the non-inverting
input provide the common-mode bias voltage. Their parallel
combination equals the DC resistance at the inverting input,
minimizing the DC offset.
+VS = 5V
6.8µF
+
1.50kΩ
0.1µF
+
0.1µF
VIN DIS (OPA635 only)
53.6Ω
1.50kΩ
OPA63x
VOUT
RL
150Ω
0.1µF 750Ω
750Ω
+VS
2
FIGURE 1. AC-Coupled Signal—Resistive Load to Supply
Midpoint.
Figure 2 shows the DC-coupled, gain of +2 configuration
used for the +3V Specifications and Typical Performance
Curves. For test purposes, the input impedance is set to 50Ω
with a resistor to ground. Though not strictly a “rail-to-rail”
design, these parts come very close, while maintaining
excellent performance. They will deliver ≤ 2.8Vp-p on a
single +3V supply with 110MHz bandwidth. The 374Ω and
2.26kΩ resistors at the input level-shift VIN so that VOUT is
within the allowed output voltage range when VIN = 0. See
the Typical Performance Curves for information on driving
capacitive loads.
+VS = 3V
6.8µF
+
2.26kΩ
0.1µF
+
374Ω
VIN
57.6Ω
OPA63x
DIS (OPA635 only)
VOUT
RL
150Ω
562Ω
750Ω
+VS
2
FIGURE 2. DC-Coupled Signal—Resistive Load to Supply
Midpoint.
SINGLE SUPPLY ADC CONVERTER INTERFACE
The front page shows a DC-coupled, single supply ADC
driver circuit. Many systems are now requiring +3V supply
capability of both the ADC and its driver. The OPA635
provides excellent performance in this demanding applica-
tion. Its large input and output voltage ranges, and low
distortion, support converters such as the ADS900 shown in
this figure. The input level-shifting circuitry was designed
so that VIN can be between 0V and 0.5V, while delivering an
output voltage of 1V to 2V for the ADS900. Both the
OPA635 and ADS900 have power reduction pins with the
same polarity for those systems that need to conserve power.
DC LEVEL SHIFTING
Figure 3 shows a DC-coupled non-inverting amplifier that
level-shifts the input up to accommodate the desired output
voltage range. Given the desired signal gain (G), and the
amount VOUT needs to be shifted up (∆VOUT) when VIN is at
the center of its range, the following equations give the
resistor values that produce the best DC offset.
where:
NG = G + ∆VOUT/VS
R1 = R4/G
R2 = R4/(NG – G)
R3 = R4/(NG –1)
NG = 1 + R4/R3
VOUT = (G)VIN + (NG – G)VS
Make sure that VIN and VOUT stay within the specified input
and output voltage ranges.
®
11 OPA634, OPA635
11 Page |
Páginas | Total 17 Páginas | |
PDF Descargar | [ Datasheet OPA635.PDF ] |
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