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PDF OPA2631 Data sheet ( Hoja de datos )
| Número de pieza | OPA2631 | |
| Descripción | Dual / Low Power / Single-Supply OPERATIONAL AMPLIFIER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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®
OPA2631
OPA2631
For most current data sheet and other product
information, visit www.burr-brown.com
TM Dual, Low Power, Single-Supply
OPERATIONAL AMPLIFIER
FEATURES
q HIGH BANDWIDTH: 75MHz (G = +2)
q LOW SUPPLY CURRENT: 6mA/ch
q +3V AND +5V OPERATION
q INPUT RANGE INCLUDES GROUND
q 4.8V OUTPUT SWING ON +5V SUPPLY
q HIGH SLEW RATE: 100V/µs
q LOW INPUT VOLTAGE NOISE: 6nV/√Hz
APPLICATIONS
q DIFFERENTIAL RECEIVERS/DRIVERS
q ACTIVE FILTERS
q MATCHED I AND Q CHANNEL AMPLIFIERS
q CCD IMAGING CHANNELS
q LOW POWER ULTRASOUND
q PORTABLE CONSUMER ELECTRONICS
SPICE model available at www.burr-brown.com
DESCRIPTION
The OPA2631 is a dual, low power, voltage-feedback
amplifier designed to operate on a single +3V or +5V
supply. Operation on ±5V or +10V supplies is also
supported. The input range extends below ground and
to within 1V of the positive supply. Using complemen-
tary common-emitter outputs provides an output swing
to within 30mV of ground and 130mV of the positive
supply. The high output drive current and low differen-
tial gain and phase errors also make it ideal for single-
supply consumer video products.
Low distortion operation is ensured by the high gain
bandwidth (68MHz) and slew rate (100V/µs), making
the OPA2631 an ideal input buffer stage to 3V and 5V
CMOS converters. Unlike other low power, single-
supply amplifiers, distortion performance improves as
the signal swing is decreased. A low 6nV/√Hz input
voltage noise supports wide dynamic range operation.
The OPA2631 is available in an industry standard
SO-8 package. Where a single channel, single-supply
operational amplifier is required, consider the OPA631
and OPA632. Where higher full-power bandwidth and
lower distortion are required, consider the OPA2634.
374Ω
VIN
+3V
2.26kΩ
1/2
OPA2631
562Ω
750Ω
100Ω
+3V
22pF
ADS901
10-Bit
20Msps
RELATED PRODUCTS
Medium Speed, No Disable
With Disable
High Speed, No Disable
With Disable
SINGLES
OPA631
OPA632
OPA634
OPA635
DUALS
OPA2631
—
OPA2634
—
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-1378A
Printed in U.S.A. August, 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 2).
SMALL-SIGNAL FREQUENCY RESPONSE
6
3 VO = 200mVp-p
G = +2
0
–3
–6
–9
G = +5
–12
–15
G = +10
–18
–21
–24
1
10 100 300
Frequency (MHz)
12
9
6
3
0
–3
–6
–9
–12
–15
–18
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 PULSE RESPONSE
VO = 4Vp-p
VO
VIN
Time (10ns/div)
Time (10ns/div)
5.0
4.9
4.8
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
50
OUTPUT SWING vs LOAD RESISTANCE
Maximum VO
Minimum VO
100
RL (Ω)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
1000
–40
–50
–60
–70
–80
–90
–100
1
CHANNEL-TO-CHANNEL CROSSTALK
10
Frequency (MHz)
100
®
5 OPA2631
5 Page 
APPLICATIONS INFORMATION
WIDEBAND VOLTAGE-FEEDBACK OPERATION
The OPA2631 is a unity-gain stable, very high-speed, volt-
age-feedback op amp designed for single-supply operation
(+3V to +5V). The input stage supports input voltages below
ground, and within 1.0V of the positive supply. The comple-
mentary common-emitter output stage provides an output
swing to within 30mV of ground and 130mV of the positive
supply. It is compensated to provide stable operation with a
wide range of resistive loads.
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 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 output DC
offset.
+VS = 5V
6.8µF
+
1.50kΩ
0.1µF
+
0.1µF
VIN
53.6Ω
1.50kΩ
1/2
OPA2631
0.1µF 750Ω
750Ω
VOUT
RL
150Ω
+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, this part comes very close, while maintaining excel-
lent performance. It will deliver ≈ 2.9Vp-p on a single +3V
supply with 61MHz 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
1/2
OPA2631
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 dual
ADC driver circuit. Many systems are now requiring +3V
supply capability of both the ADC and its driver. The
OPA2631 provides excellent performance in this demand-
ing application. Its large input and output voltage ranges,
and low distortion support converters such as the ADS901
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 ADS901.
BANDPASS FILTER
Figure 3 shows a single OPA2631 implementing a 6th-order
bandpass filter. This filter cascades two 2nd-order Sallen-
Key sections with transmission zeros, and a double real pole
section. It has –3dB frequencies of 630kHz and 1.5MHz,
and –40dB frequencies of 230kHz and 4.2MHz. This filter
was designed to work well on +5V or ±5V supplies, while
driving an A/D converter at 6MSPS to 10MSPS (e.g., the
ADS804).
The filter transfer function is based on a 4th-order elliptic
bandpass filter, with real highpass and lowpass poles added
at the output to give a 6th-order response. The components
were chosen to give this transfer function. The 20Ω resistor
isolates the first OPA2631 output from capacitive loading,
but affects the response at very high frequencies only.
Figure 4 shows the nominal response simulated by SPICE®.
DC LEVEL SHIFTING
Figure 5 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
®
11 OPA2631
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet OPA2631.PDF ] | |
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