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PDF OPA2634 Data sheet ( Hoja de datos )
| Número de pieza | OPA2634 | |
| Descripción | Dual / Wideband / Single-Supply OPERATIONAL AMPLIFIER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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®
OPA2634
OPA2634
For most current data sheet and other product
information, visit www.burr-brown.com
TM Dual, Wideband, Single-Supply
OPERATIONAL AMPLIFIER
FEATURES
q HIGH BANDWIDTH: 150MHz (G = +2)
q +3V AND +5V OPERATION
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
APPLICATIONS
q DIFFERENTIAL RECEIVERS/DRIVERS
q ACTIVE FILTERS
q MATCHED I AND Q CHANNEL AMPLIFIERS
q CCD IMAGING CHANNELS
q LOW POWER ULTRASOUND
374Ω
Q
+3V
2.26kΩ
1/2
OPA2634
+3V
100Ω
22pF
ADS900
10-Bit
20Msps
562Ω
750Ω
374Ω
I
+3V
2.26kΩ
1/2
OPA2634
+3V
100Ω
22pF
ADS900
10-Bit
20Msps
562Ω
750Ω
DESCRIPTION
The OPA2634 is a dual, low power, voltage-feedback,
high-speed operational amplifier designed to operate
on +3V or +5V single-supply voltage. 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-emit-
ter outputs provides an output swing to within 30mV
of ground and 140mV of positive supply.
Low distortion operation is ensured by the high gain
bandwidth (140MHz) and slew rate (250V/µs). This
makes the OPA2634 an ideal differential input buffer
stage to 3V and 5V CMOS converters. Unlike other
low power, single-supply operational amplifiers, dis-
tortion performance improves as the signal swing is
decreased. A low 5.6nV/√Hz input voltage noise sup-
ports wide dynamic range operation.
The OPA2634 is available in an industry-standard dual
pinout SO-8 package. Where a single channel, single-
supply operational amplifier is required, consider the
OPA634 and OPA635. Where lower supply current
and speed are required, consider the OPA2631.
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-1466A
Printed in U.S.A. September, 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 PULSE RESPONSE
VO = 2Vp-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 OPA2634
5 Page 
frequency of 5MHz, and a –60dB stopband starting at
12MHz. This filter works well on +5V or ±5V supplies, and
with an A/D converter at 20MSPS (e.g., ADS900). VIN
needs to be a very low impedance source, such as an op amp.
The filter transfer function was designed using Burr-Brown’s
FilterPro 42 design program (available at www.burr-
brown.com in the Applications section) with a nominal
stopband attenuation of 60dB. Table I gives the results (H0
= DC gain, fP = pole frequency, QP = pole quality, and fZ =
zero frequency). Note that the parameters were generated at
f–3dB = 5Hz, and then scaled to f–3dB = 5MHz.
SECTION NO.
1
2
3
H0
1V/V
1V/V
1V/V
fP
5.04MHz
5.31MHz
5.50MHz
TABLE I. Nominal Filter Parameters.
QP
1.77
0.64
—
fZ
12.6MHz
20.4MHz
—
The components were chosen to give this transfer function.
The 20Ω resistors isolate the amplifier outputs from capacitive
loading, but affect the response at very high frequencies only.
Figure 4 shows the nominal response simulated by SPICE; it
is very close to the ideal response.
0
–10
–20
–30
–40
–50
–60
–70
–80
1
10
Frequency (MHz)
100
FIGURE 4. Nominal Filter Response.
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 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 (Noise Gain)
VOUT = (G)VIN + (NG – G)VS
R1
VIN
+VS
R2
1/2
OPA2634
VOUT
R3 R4
FIGURE 5. DC Level-Shifting Circuit.
Make sure that VIN and VOUT stay within the specified input
and output voltage ranges.
The front page circuit is a good example of this type of
application. It was designed to take VIN between 0V and
0.5V, and produce VOUT between 1V and 2V, when using a
+3V supply. This means G = 2.00, and ∆VOUT = 1.50V – G
• 0.25V = 1.00V. Plugging into the above equations gives:
NG = 2.33, R1 = 375Ω, R2 = 2.25kΩ, and R3 = 563Ω. The
resistors were changed to the nearest standard values.
NON-INVERTING AMPLIFIER WITH
REDUCED PEAKING
Figure 6 shows a non-inverting amplifier that reduces peak-
ing at low gains. The resistor RC compensates the OPA2634
to have higher Noise Gain (NG), which reduces the AC
response peaking (typically 5dB at G = +1 without RC)
without changing the DC gain. VIN needs to be a low
impedance source, such as an op amp. The resistor values
are low to reduce noise. Using both RT and RF helps
minimize the impact of parasitic impedances.
RT
VIN
1/2
RC OPA2634
VOUT
RG RF
FIGURE 6. Compensated Non-Inverting Amplifier.
®
11 OPA2634
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet OPA2634.PDF ] | |
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