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PDF OPA4658 Data sheet ( Hoja de datos )
| Número de pieza | OPA4658 | |
| Descripción | Quad 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 OPA4658 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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® OPA4658
OPA4658
OPA4658
Quad Wideband, Low Power Current Feedback
OPERATIONAL AMPLIFIER
FEATURES
q GAIN BANDWIDTH: 900MHz at G = 2
q GAIN OF 2 STABLE
q LOW POWER: 50mW PER AMP
q LOW DIFF GAIN/PHASE ERRORS:
0.015%/0.02°
q HIGH SLEW RATE: 1700V/µs
q PACKAGE: 14-Pin DIP and SO-14
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
DESCRIPTION
The OPA4658 is a quad 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
quiescent current make the OPA4658 a perfect choice
for numerous video, imaging and communications
applications.
The OPA4658 is internally compensated for stability in
gains of 2 or greater. The OPA4658 is also available in
dual (OPA2658) and single (OPA658) configurations.
+VS
IBIAS
Current Mirror
V+
V–
Buffer
VOUT
CCOMP
IBIAS
Current Mirror
NOTE: Diagram reflects only one-fourth of the OPA4658.
–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-1270C
OPPrinAted4in6U5.S8.A. March, 1998
®
1 page  
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±5V, RL = 100Ω, CL = 2pF, RFB = 402Ω, unless otherwise noted.
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)
12
9
6
3
0
–3
–6
–9
– 12
1M
CLOSED-LOOP BANDWIDTH (G = +2)
SO-14 Bandwidth = 458MHz
(Dashed Line)
DIP Bandwidth = 435M
(Solid Line)
10M
100M
Frequency (Hz)
1G
10G
26
23
20
17
14
11
8
5
2
1M
CLOSED-LOOP BANDWIDTH (G = +10)
Bandwidth = 134MHz
10M
100M
Frequency (Hz)
1G
20
17
14
11
8
5
2
1M
CLOSED-LOOP BANDWIDTH (G = +5)
Bandwidth = 205MHz
10M
100M
Frequency (Hz)
1G
COMMON-MODE REJECTION
vs INPUT COMMON-MODE VOLTAGE
55
50
45
40
35
30
–4 –3 –2 –1 0 1 2 3 4
Common-Mode Voltage (V)
®
5 OPA4658
5 Page 
–50
G = +2
–60
–70
–80
–90
2fO
3fO
channel or channels. Crosstalk is inclined to occur in most
multichannel integrated circuits. In quad devices, the effect of
crosstalk is measured by driving three channels 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, therefore at increased gain, crosstalk also in-
creases by a factor equal to that of the gain. Figure 7 illustrates
the measured effect of crosstalk in the OPA4658U.
–100
10
100
Load Resistance (Ω)
1k
FIGURE 5. 5MHz Harmonic Distortion vs Load Resistance.
The third-order intercept is an important parameter for many
RF amplifier applications. Figure 6 shows the OPA4658’s
two tone, third-order intercept vs frequency. This curve is
particularly useful for determining the magnitude of the
third harmonic as a function of frequency, load resistance,
and gain. For example, assume that the application requires
the OPA4658 to operate in a gain of +2V/V and drive
2Vp-p into 100Ω at a frequency of 10MHz. Referring to
Figure 6 we find that the intercept point is +38dBm. The
magnitude of the third harmonic can now be easily calcu-
lated from the expression:
Third Harmonic (dBc) = 2(OPI3P – PO)
where OPI3P = third-order output intercept, dBm
PO = output level, dBm
For this case OPI3P = 38dBm, PO = 7dBm, and the third
Harmonic = 2(38 – 7) = 62dB below the fundamental. The
OPA4658’s low distortion makes the device an excellent
choice for a variety of RF signal processing applications.
CROSSTALK
Crosstalk is the undesired result of the signal of one channel
mixing with and reproducing itself in the output of another
(G = +2, RL = 100Ω, RFB = 402Ω)
70
G = +2
60
50
40
30
20
100k
1M 10M
Frequency (Hz)
100M
FIGURE 6. Third Order Intercept Point vs Frequency.
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
1M
G = +2
10M
Frequency (Hz)
100M
FIGURE 7. Channel-to-Channel Isolation (three active channels).
DIFFERENTIAL GAIN AND PHASE
Differential Gain (DG) and Differential Phase (DP) are criti-
cal specifications for video applications. DG is defined as the
percent change in closed-loop gain over a specified change in
output voltage level. DP is defined as the change in degrees of
the closed-loop phase over the same output voltage change.
Both DG and DP are specified at the NTSC sub-carrier
frequency of 3.58MHz and the PAL subcarrier of 4.43MHz.
All NTSC measurements were performed using a Tektronix
model VM700A Video Measurement Set.
DG and DP of the OPA4658 were measured with the amplifier
in a gain of +2V/V with 75Ω input impedance and the output
back-terminated in 75Ω. The input signal selected from the
generator was a 0V to 1.4V modulated ramp with sync pulse.
With these conditions the test circuit shown in Figure 8
delivered a 100IRE modulated ramp to the 75Ω input of the
video analyzer. The signal averaging feature of the analyzer
75Ω
1/4
OPA4658
75Ω 402Ω
TEK TSG 130A
402Ω
75Ω
75Ω
TEK VM700A
FIGURE 8. Configuration for Testing Differential Gain/Phase.
®
11 OPA4658
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| PDF Descargar | [ Datasheet OPA4658.PDF ] | |
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