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PDF OPA4650 Data sheet ( Hoja de datos )
| Número de pieza | OPA4650 | |
| Descripción | Wideband / Low Power / Quad Voltage Feedback OPERATIONAL AMPLIFIER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OPA4650 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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® OPA4650
OPA4650
OPA4650
DEMO BOARD
AVAILABLE
Wideband, Low Power, Quad Voltage Feedback
OPERATIONAL AMPLIFIER
FEATURES
q LOW POWER: 50mW/channel
q UNITY GAIN STABLE BANDWIDTH:
360MHz
q FAST SETTLING TIME: 20ns to 0.01%
q LOW INPUT BIAS CURRENT: 5µA
q DIFFERENTIAL GAIN/PHASE ERROR:
0.01%/0.025°
q 14-PIN DIP and SO-14 SURFACE MOUNT
PACKAGES AVAILABLE
APPLICATIONS
q HIGH RESOLUTION VIDEO
q MONITOR PREAMPLIFIER
q CCD IMAGING AMPLIFIER
q ULTRASOUND SIGNAL PROCESSING
q ADC/DAC BUFFER AMPLIFIER
q ACTIVE FILTERS
q HIGH SPEED INTEGRATORS
q DIFFERENTIAL AMPLIFIER
DESCRIPTION
The OPA4650 is a quad, low power, wideband voltage
feedback operational amplifier. It features a high band-
width of 360MHz as well as a 12-bit settling time of
only 20ns. The low input bias current allows its use in
high speed integrator applications, while the wide
bandwidth and true differential input stage make it
suitable for use in a variety of active filter applica-
tions. Its low distortion gives exceptional performance
for telecommunications, medical imaging and video
applications.
The OPA4650 is internally compensated for unity-
gain stability. This amplifier has a fully symmetrical
differential input due to its “classical” operational
amplifier circuit architecture. Its unusual combination
of speed, accuracy and low power make it an outstand-
ing choice for many portable, multi-channel and other
high speed applications, where power is at a premium.
The OPA4650 is also available in single (OPA650)
and dual (OPA2650) configurations.
+VS
Non-Inverting
Input
Inverting
Input
Current
Mirror
Output
Stage
CC
Output
–VS
Simplified Schematic
1 of 4 Channels
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-1267B
Printed in U.S.A. July, 1995
1 page  
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±5V, RL = 100Ω, and RFB = 402Ω, unless otherwise noted. RFB = 25Ω for a gain of +1.
RECOMMENDED ISOLATION RESISTANCE
vs CAPACITIVE LOAD
40
30
20
10
0
0
25Ω
OPA4650
RISO
CL 1kΩ
20 40 60 80
Capacitive Load, C (pF)
L
100
200
160
120
80
40
0
–40
–80
–120
–160
–200
SMALL SIGNAL TRANSIENT RESPONSE
(G = +1)
Time (5ns/div)
2.0
1.6
1.2
0.8
0.4
0
–0.4
–0.8
–1.2
–1.6
–2.0
LARGE SIGNAL TRANSIENT RESPONSE
(G = +1)
Time (5ns/div)
6
3
0
–3
–6
–9
–12
1M
CLOSED-LOOP BANDWIDTH (G = +1)
SO-14/DIP Bandwidth = 360MHz
10M
100M
Frequency (Hz)
1G
12
9
6
3
0
–3
–6
–9
1M
CLOSED-LOOP BANDWIDTH (G = +2)
SO-14/DIP Bandwidth = 120MHz
10M 100M
Frequency (Hz)
1G
21
17
14
11
8
5
2
–1
1M
CLOSED-LOOP BANDWIDTH (G = +5)
SO-14/DIP Bandwidth = 35MHz
10M 100M
Frequency (Hz)
1G
®
5 OPA4650
5 Page 
DIFFERENTIAL GAIN AND PHASE
Differential Gain (DG) and Differential Phase (DP) are
among the more important specifications for video applica-
tions. The percentage change in closed-loop gain over a
specified change in output voltage level is defined as DG.
DP is defined as the change in degrees of the closed-loop
phase over the same output voltage change. For the OPA4650,
DG and DP are both specified at the NTSC color sub-carrier
frequency of 3.58MHz and measured using industry stan-
dard video test equipment.
DISTORTION
The OPA4650’s harmonic distortion characteristics for a
100Ω load are shown in the Typical Performance Curves.
Distortion can be improved by increasing the load resistance
as illustrated in Figure 5. Remember to include the contribu-
tion of the feedback network when calculating the effective
load resistance seen by the amplifier.
–50
(fO = 5MHz, 2Vp-p)
–60
–70 2fO
–80 3fO
–90
10
100
Load Resistance (Ω)
1k
FIGURE 5. Harmonic Distortion vs Load Resistance.
CROSSTALK
Crosstalk is the undesired coupling of one channel’s signal
into the output of the other channels. Crosstalk is a consid-
eration in all multichannel integrated circuits. The effect of
crosstalk is measured by driving one (“channel-to-channel”)
or more (“all-hostile”) channels and observing the output of
the undriven channel. The magnitude of this effect is ex-
pressed in the crosstalk specification as decibels of gain.
“Input referred” points to the fact that there is a direct
correlation between gain and crosstalk, therefore output
crosstalk increases proportionally at higher gains.
In quad devices, the effect of all-hostile crosstalk is observed
by driving all three channels concurrently and measuring the
output of the undriven fourth channel. The plots in Figure 6
illustrate both channel-to-channel and all-hostile crosstalk
for the OPA4650.
–30
G = +1
–40
All Hostile
–50
–60
Channel-to-Channel
–70
–80
0.1
1 10
Frequency (Hz)
100 300
FIGURE 6. Channel-to-Channel Isolation and All Hostile
Crosstalk.
NOISE FIGURE
The voltage and current noise spectral density are shown in
the Typical Performance Curves. For RF and IF applica-
tions, however, Noise Figure (NF) is often the preferred
specification. This specification shows a degradation in
SNR through a device relative to the thermal noise of the
source impedance alone.
The NF for the OPA4650, using 1MHz spot noise numbers
and an unterminated non-inverting input, is shown in
Figure 7.
30
NF = 10 LOG 1 + en2 + (InRS)2
25 4KTRS
20
15
10
5
0
10
100 1k 10k
Source Resistance (Ω)
FIGURE 7. Noise Figure vs Source Resistance.
100k
SPICE MODELS AND EVALUATION BOARD
Computer simulation using SPICE is often useful when
analyzing the performance of analog circuits and systems.
This is particularly true for Video and RF amplifier circuits
where parasitic capacitance and inductance can have a
major effect on circuit performance. SPICE models and
evaluation PC boards are available for the OPA4650. Con-
tact the Burr-Brown Applications Department to receive a
SPICE diskette.
DEMONSTRATION BOARD
DEM-OPA465xP
DEM-OPA465xU
PACKAGE
8-Pin DIP
SO-8
PRODUCT
OPA4650P
oPA4650U
®
11 OPA4650
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet OPA4650.PDF ] | |
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