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PDF OPA646 Data sheet ( Hoja de datos )
| Número de pieza | OPA646 | |
| Descripción | Low Power / Wide Bandwidth OPERATIONAL AMPLIFIER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OPA646 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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®
OPA646
OPA646
Low Power, Wide Bandwidth
OPERATIONAL AMPLIFIER
FEATURES
q LOW POWER: 55mW
q UNITY-GAIN BANDWIDTH: 650MHz
q UNITY-GAIN STABLE
q FAST 12-BIT SETTLING: 15ns (0.01%)
q LOW INPUT BIAS CURRENT: 2µA
q LOW HARMONICS: –82dBc at 5MHz
q LOW DIFFERENTIAL GAIN/PHASE
ERRORS: 0.025%/0.08°
APPLICATIONS
q TELECOMMUNICATIONS
q MEDICAL IMAGING
q CCD IMAGING
q PORTABLE EQUIPMENT
q ACTIVE FILTERS
q VIDEO AMPLIFICATION
q ADC/DAC GAIN AMPLIFIER
q HIGH SPEED INTEGRATORS
DESCRIPTION
The OPA646 is a low power, wideband voltage feed-
back operational amplifier. It features a high
bandwidth of 650MHz as well as a 12-bit settling time
of only 15ns. Its low input bias current and wide
bandwidth allows it to be used for high speed integra-
tor and active filter designs. Its low distortion gives
exceptional performance for telecommunications,
medical imaging and video applications.
The OPA646 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 ideal
choice for many portable, multichannel and other high
speed applications where power is at a premium.
+VS
7, 8
Non-Inverting 3
Input
Inverting 2
Input
Current
Mirror
Output
Stage
CC
6
VOUT
4, 5
–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
©1993 Burr-Brown Corporation
PDS-11192C
OPA646Printed in U.S.A. March, 1998
®
1 page  
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±5V, RL = 100Ω, CL = 2pF, RFB = 402Ω and all four power supply pins are used, unless otherwise noted. RFB = 25Ω for a gain of +1.
RECOMMENDED ISOLATION RESISTANCE
vs CAPACITIVE LOAD
25
20
15
10
5
0
0 50 100 150
Capacitive Load (pF)
200
160
120
80
40
0
–40
–80
–120
–160
–200
SMALL SIGNAL TRANSIENT RESPONSE
(G = +1, RL = 100Ω)
Time (5ns/div)
LARGE SIGNAL TRANSIENT RESPONSE
(G = +1, RL = 100Ω)
2.0
1.6
1.2
0.8
0.4
0
–0.4
–0.8
–1.2
–1.6
–2.0
Time (5ns/div)
G = +1 CLOSED-LOOP
SMALL SIGNAL BANDWIDTH
9
6
Gain
3
0
–3
–6
Closed-Loop
–9 Phase
–12 Bandwidth
–15 = 625MHz
–18
1M
10M 100M
Frequency (Hz)
0
–45
–90
–135
–180
–225
1GHz
G = –1V/V CLOSED-LOOP
SMALL SIGNAL BANDWIDTH
Gain
0
–3
–6
Closed-Loop
–9 Phase
–12
–15
Bandwidth
= 165MHz
–180
–225
–270
–315
–360
1M
10M
100M
1GHz
Frequency (Hz)
G = +2 CLOSED-LOOP
SMALL SIGNAL BANDWIDTH
15
12
9
6
3
0
–3
–6
1M
Gain
Bandwidth
= 185MHz
Closed-Loop
Phase
10M 100M
Frequency (Hz)
0
–45
–90
–135
1GHz
®
5 OPA646
5 Page 
DISTORTION
The OPA646’s harmonic distortion characteristics into a
100Ω load are shown vs frequency and power output in the
Typical Performance Curves. Distortion can be significantly
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
resistance seen by the amplifier.
–40
–50
–60
–70
–80
–90
–100
10
20
(G = +1, fO = 5MHz)
3fO
2fO
50 100 200
Load Resistance (Ω)
500 1K
FIGURE 6. 5MHz Harmonic Distortion vs Load Resistance
with RF = 402Ω.
SPICE MODELS
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 are available
for the OPA646. Contact Burr-Brown Applications Depart-
ment to receive a spice diskette.
DEMONSTRATION BOARDS
Demonstration boards to speed prototyping are available.
Refer to the DEM-OPA64X Data Sheet for details.
NOISE FIGURE
The OPA646 voltage and current noise spectral densities are
specified in the Typical Performance Curves. For RF appli-
cations, however, Noise Figure (NF) is often the preferred
noise specification since it allows system noise performance
to be more easily calculated. The OPA646’s Noise Figure vs
Source Resistance is shown in Figure 7.
25
20
NF = 10 LOG 1 + en2 + (InRS)2
4KTRS
15
10
5
0
10
100 1k 10k
Source Resistance (Ω)
FIGURE 7. Noise Figure vs Source Resistance.
100k
®
11 OPA646
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet OPA646.PDF ] | |
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