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PDF OPA685 Data sheet ( Hoja de datos )
| Número de pieza | OPA685 | |
| Descripción | Ultra-Wideband / Current-Feedback OPERATIONAL AMPLIFIER With Disable TM | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OPA685 (archivo pdf) en la parte inferior de esta página. Total 28 Páginas | ||
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®
OPA685
OPA685
OPA685
For most current data sheet and other product
information, visit www.burr-brown.com
TM Ultra-Wideband, Current-Feedback
OPERATIONAL AMPLIFIER With Disable
FEATURES
q GAIN = +2 BANDWIDTH (900MHz)
q GAIN = +8 BANDWIDTH (420MHz)
q OUTPUT VOLTAGE SWING: ±3.6V
q ULTRA-HIGH SLEW RATE: 4200V/µs
q 3RD-ORDER INTERCEPT: > 40dBm (f < 50MHz)
q LOW POWER: 129mW
q LOW DISABLED POWER: 3mW
APPLICATIONS
q LOW COST PRECISION IF AMPLIFIER
q CABLE MODEM UPSTREAM DRIVER
q BROADBAND VIDEO LINE DRIVER
q VERY WIDEBAND ADC BUFFER
q PORTABLE INSTRUMENTS
q ACTIVE FILTERS
q ARB WAVEFORM OUTPUT DRIVER
DESCRIPTION
The OPA685 is a very high bandwidth, current-feed-
back op amp that combines exceptional 4200V/µs slew
rate and low input voltage noise to deliver a precision
low cost, high dynamic range Intermediate Frequency
(IF) amplifier. Optimized for high gain operation, the
OPA685 is ideally suited to buffering Surface Acoustic
Wave (SAW) filters in an IF strip or delivering high
output power at low distortion for cable modem up-
stream line drivers. Even higher bandwidth at lower
gains gives a 900MHz video line driver for high
resolution workstation graphics.
The OPA685’s low 12.9mA supply current is pre-
cisely trimmed at +25°C. This trim, along with a low
temperature drift, guarantees low system power over-
temperature. System power may be further reduced
using the optional disable control pin. Leaving this pin
open, or holding it HIGH, gives normal operation. If
pulled LOW, the OPA685 supply current drops to less
than 320µA. This power-savings feature, along with
exceptional single +5V operation, and ultra-small
SOT23-6 packaging, make the OPA685 ideal for por-
table communications requirements.
OPA685 RELATED PRODUCTS
SINGLES
OPA658
OPA681
OPA682
DUALS
OPA2658
OPA2681
OPA2682
TWO-TONE, 3rd-ORDER
INTERMODULATION INTERCEPT
50
+5V
50Ω
Source 50Ω
OPA685
50Ω Matching
Network
–5V
400Ω
SAW
Filter
50Ω
40
30
20
Low Distortion, 12dB Gain SAW Driver
10
0
50 100 150 200
Center Frequency (MHz)
250
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-1499A
Printed in U.S.A. April, 1999
1 page  
TYPICAL PERFORMANCE CURVES: VS = ±5V
G = +8, RF = 402Ω, and RL = 100Ω, unless otherwise noted.
NON-INVERTING SMALL-SIGNAL
FREQUENCY RESPONSE
6
3 G = +2, RF = 511Ω VO = 500mVp-p
0
–3
–6
–9 G = +4, RF = 475Ω
–12
–15 G = +8, RF = 402Ω
–18
–21
–24
0
See Figure 1
G = +16, RF = 249Ω
500MHz
Frequency (100MHz/div)
1GHz
INVERTING SMALL-SIGNAL
FREQUENCY RESPONSE
6
3 GG==––22,,RRFF== 499ΩΩ
VO = 500mVp-p
0 G = –4, RF = 475Ω
–3 G = –8, RF = 442Ω
–6
–9
–12
–15
–18 G = –16, RF = 806Ω
–21 See Figure 2
–23
0
500MHz
Frequency (100MHz/div)
1GHz
NON-INVERTING LARGE-SIGNAL
FREQUENCY RESPONSE
24
21 G = +8, RF = 402Ω
18
15 VO = 1Vp-p
12
9 VO = 2Vp-p
6
3 VO = 4Vp-p
0
–3
See Figure 1
–6
0
VO = 7Vp-p
500MHz
Frequency (100MHz/div)
1GHz
INVERTING LARGE-SIGNAL
FREQUENCY RESPONSE
24
21 G = –8, RF = 442Ω
18
VO = 1Vp-p
15
12 VO = 2Vp-p
9
6 VO = 4Vp-p
VO = 7Vp-p
3
0
–3 See Figure 2
–6
0
500MHz
Frequency (100MHz/div)
1GHz
RECOMMENDED RS vs CAPACITIVE LOAD
70
G = +8
60
50
40
30
VI
20 50Ω
10
0
10
OPA685
402Ω
RS
CL
VO
1kΩ
56.2Ω
1kΩ is optional
Capacitive Load (pF)
100
FREQUENCY RESPONSE vs CAPACITIVE LOAD
21
18
15
12
9
6
3
0 CL = 100pF
–3
Optimized RS
CL = 10pF
CL = 20pF
CL = 47pF
0
250 MHz
500 MHz
Frequency (50MHz/div)
®
5 OPA685
5 Page 
TYPICAL PERFORMANCE CURVES: VS = +5V
G = +8, RF = 348Ω, and RL = 100Ω, unless otherwise noted.
NON-INVERTING SMALL-SIGNAL
FREQUENCY RESPONSE
6
3 VO = 500mVp-p
G = +2, RF = 487Ω
0
–3 G = +4, RF = 442Ω
–6
–9
–12 G = +8, RF = 348Ω
–15
–18 G = +16, RF = 162Ω
–21
See Figure 3
–24
0 500MHz
Frequency (100MHz/div)
1GHz
INVERTING SMALL-SIGNAL
FREQUENCY RESPONSE
6
3 VO = 500mVp-p
0 G = –4, RF = 432Ω
–3
G = –2, RF = 464Ω
–6
–9
–12 G = –16, RF = 806Ω
–15
–18
–21
See Figure 4
–24
0
G = –8, RF = 402Ω
500MHz
Frequency (100MHz/div)
1GHz
NON-INVERTING PULSE RESPONSE
1.6
G = +8
1.2 RL = 100Ω
RF = 348Ω
0.8
Output
VO =2Vp-p
0.4 Input
0
–0.4
–0.8
–1.2
–1.6
See Figure 3
Time (2ns/div)
RECOMMENDED RS vs CAPACITIVE LOAD
70
60
50
40 +5V
30
VI
20
10
0
10
0.1µF 2.5kΩ
52.3Ω 2.5kΩ OPA685
348Ω
RS
CL
VO
1kΩ
35.7Ω
0.1µF
1kΩ load is optional
Capacitive Load (pF)
100
INVERTING PULSE RESPONSE
1.6
G = –8
1.2 RL = 100Ω
RF = 402Ω
0.8
VO = 2Vp-p
0.4 Input
0
–0.4
–0.8
Output
–1.2
–1.6
See Figure 4
Time (2ns/div)
FREQUENCY RESPONSE vs CAPACITIVE LOAD
24
21 CL = 10pF
18 CL = 20pF
15
12 CL = 47pF
9
6
3
0
–3
CL = 100pF
Optimized RS
–6
0
250MHz
Frequency (50MHz/div)
500MHz
®
11 OPA685
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet OPA685.PDF ] | |
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