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PDF OPA2658 Data sheet ( Hoja de datos )
| Número de pieza | OPA2658 | |
| Descripción | Dual Wideband / Low Power / Current Feedback OPERATIONAL AMPLIFIER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OPA2658 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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® OPA2658
OPA2658
OPA2658
Dual Wideband, Low Power, Current Feedback
OPERATIONAL AMPLIFIER
FEATURES
q UNITY GAIN STABLE BANDWIDTH:
800MHz
q LOW POWER: 50mW/Chan.
q LOW DIFFERENTIAL GAIN/PHASE
ERRORS: 0.01%/0.03°
q HIGH SLEW RATE: 1700V/µs
q PACKAGE: 8-Pin DIP, SO-8 and MSOP-8
DESCRIPTION
The OPA2658 is a dual, ultra-wideband, low power
current feedback video operational amplifier featuring
high slew rate and low differential gain/phase error.
The current feedback design allows for superior large
signal bandwidth, even at high gains. The low differ-
ential gain/phase errors, wide bandwidth and low
+VS
APPLICATIONS
q MEDICAL IMAGING
q HIGH-RESOLUTION VIDEO
q HIGH-SPEED SIGNAL PROCESSING
q COMMUNICATIONS
q PULSE AMPLIFIERS
q ADC/DAC GAIN AMPLIFIER
q MONITOR PREAMPLIFIER
q CCD IMAGING AMPLIFIER
quiescent current make the OPA2658 a perfect choice
for numerous video, imaging and communications
applications.
The OPA2658 is optimized for low gain operation,
and is also available in single, OPA658 and quad,
OPA4658 configurations.
IBIAS
Current Mirror
+Input
–Input
CCOMP
Buffer
VOUT
IBIAS
Current Mirror
NOTE: Diagram reflects only one-half of the OPA2658
–VS
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/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1994 Burr-Brown Corporation
PDS-11269D
OPPrinAted2in6U5.S8.A. March, 1998
®
1 page  
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±5V, RL = 100Ω, RFB = 402Ω, unless otherwise noted.
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
–50
INVERTING INPUT BIAS CURRENT
vs TEMPERATURE
–25 0
25 50 75
Temperature (°C)
100
106
105
104
103
102
101
1
1k
OPEN-LOOP TRANSIMPEDANCE AND PHASE
vs FREQUENCY
Transimpedance
0
Phase
–45
–90
–135
–180
–225
10k 100k 1M 10M 100M 1G
Frequency (Hz)
OPEN-LOOP GAIN AND PHASE vs FREQUENCY
60
40
Gain
0
Phase
20 –45
0 –90
–20 –135
–40 –180
–60
1k
–225
10k 100k 1M 10M 100M 1G
Frequency (Hz)
CLOSED-LOOP BANDWIDTH
6
SO-8 Bandwidth = 881MHz, RFB = 402Ω
3
G = +1
0
–3 DIP Bandwidth = 949MHz, RFB = 560Ω
–6
–9
1M
MSOP-8 Bandwidth = 600MHz, RFB = 560Ω
10M 100M
Frequency (Hz)
1G
9
6
3
0
–3
–6
1M
CLOSED-LOOP BANDWIDTH
G = +2
DIP Bandwidth = 682MHz
SO-8 Bandwidth = 680MHz
MSOP-8 Bandwidth = 351MHz
10M 100M
Frequency (Hz)
1G
20
17
14
11
8
5
2
1M
CLOSED-LOOP BANDWIDTH
G = +5
MSOP-8/SO-8/DIP Bandwidth= 372MHz
10M 100M
Frequency (Hz)
1G
®
5 OPA2658
5 Page 
CAPACITIVE LOADS
The OPA2658’s output stage has been optimized to drive
low resistive loads. Capacitive loads, however, will decrease
the amplifier’s phase margin which may cause high fre-
quency peaking or oscillations. Capacitive loads greater than
5pF should be buffered by connecting a small resistance,
usually 10Ω to 35Ω, in series with the output as shown in
Figure 5. This is particularly important when driving high
capacitance loads such as flash A/D converters.
In general, capacitive loads should be minimized for opti-
mum high frequency performance. Coax lines can be driven
if the cable is properly terminated. The capacitance of coax
cable (29pF/foot for RG-58) will not load the amplifier
when the coaxial cable or transmission line is terminated
with its characteristic impedance.
402Ω
402Ω
1/2
OPA2658
10Ω to 35Ω
RS
50Ω
RL CL
tone, third-order spurious plot shown in Figure 7 indicates
how far below these two equal power, closely spaced, tones
the intermodulation spurious will be. The single tone power
is at a matched 50Ω load. The unique design of the OPA2658
provides much greater spurious free range than what a two-
tone third-order intermodulation intercept specification would
predict. This can be seen in Figure 7 as the spurious free
range actually increases at the higher output power levels.
5MHz HARMONIC DISTORTION vs
LOAD RESISTANCE (G = +2)
–55
–60
G = +2, VO = 2Vp-p, fO = 5MHz
–65
3fO
–70
–75
–80 2fO
–85
10
100
Load Resistance (Ω)
1k
FIGURE 6. 5MHz Harmonic Distortion vs Load Resistance.
FIGURE 5. Driving Capacitive Loads.
COMPENSATION
The OPA2658 is internally compensated and is stable in
unity gain with a phase margin of approximately 62°, and
approximately 64° in a gain of +2V/V when used with the
recommended feedback resistor value. Frequency response
for other gains are shown in the Typical Performance Curves.
The high-frequency response of the OPA2658 in a good
layout is very flat with frequency.
TWO TONE, THIRD-ORDER SPURIOUS LEVELS
–65
20MHz
–70
–75 10MHz
–80 5MHz
–85
DISTORTION
The OPA2658’s Harmonic Distortion characteristics into a
100Ω load are shown versus frequency and power output in
the Typical Performance Curves. Distortion can be further
improved by increasing the load resistance as illustrated in
Figure 6. Remember to include the contribution of the
feedback resistance when calculating the effective load re-
sistance seen by the amplifier.
Narrowband communication channel requirements will ben-
efit from the OPA2658’s wide bandwidth and low
intermodulation distortion on low quiescent power. If output
signal power at two closely spaced frequencies is required,
third-order nonlinearities in any amplifier will cause spuri-
ous power at frequencies very near the two funda-
mental frequencies. If the two test frequencies, f1 and f2,
are specified in terms of average and delta frequency,
fO = (f1 + f2)/2 and ∆f = f2 – f1, the two, third-order,
close-in spurious tones will appear at fO ±3 • ∆f. The two
–90
–18 –16 –14 –12 –10 –8 –6 –4 –2 0 2 4
Single Tone Power (dBm)
FIGURE 7. Third-Order Intercept Point vs Frequency.
CROSSTALK
Crosstalk is the undesired result of the signal of one channel
mixing with and reproducing itself in the output of the other
channel. Crosstalk occurs in most multichannel integrated
circuits. In dual devices, the effect of crosstalk is measured by
driving one channel and observing the output of the undriven
channel over various frequencies. The magnitude of this effect
is referenced in terms of channel- to-channel isolation and
expressed in decibels. "Input referred" points to the fact that
there is a direct correlation between gain and crosstalk, there-
fore at increased gain, crosstalk also increases by a factor
equal to that of the gain. Figure 8 illustrates the measured
effect of crosstalk in the OPA2658U.
®
11 OPA2658
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet OPA2658.PDF ] | |
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