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PDF OPA678 Data sheet ( Hoja de datos )
| Número de pieza | OPA678 | |
| Descripción | Wideband Switched-Input OPERATIONAL AMPLIFIER | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de OPA678 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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®
OPA678
OPA678
OPA678
Wideband Switched-Input
OPERATIONAL AMPLIFIER
FEATURES
q FAST SETTLING: 11ns (1%)
q WIDE BANDWIDTH: 200MHz
q TWO LOGIC SELECTABLE INPUTS
q LOW OFFSET VOLTAGE: ±380µV
q FAST INPUT SWITCHING: 4ns
q ACCEPTS TTL/ECL SWITCHING SIGNALS
q UNITY GAIN STABLE
q 16-PIN DIP AND SO-16 PACKAGES
APPLICATIONS
q VIDEO AMPLIFICATION AND SWITCHING
q FAST 2-INPUT MULTIPLEXER
q PULSE/RF AMPLIFIERS
q PROGRAMMABLE-GAIN AMPLIFIER
q ACTIVE FILTERS
q SYNCHRONOUS DEMODULATOR
q LOW COST REPLACEMENT FOR OPA675/676
DESCRIPTION
The OPA678 is a wideband monolithic operational
amplifier with two independent differential inputs.
Either input can be selected by an external TTL or
ECL logic signal. The amplifier is externally compen-
sated and features a very fast input selection speed, 4ns
for either ECL or TTL. This amplifier features fully
symmetrical differential inputs due to its “classical”
operational amplifier circuit architecture. Unlike “cur-
rent-feedback” amplifier designs, the OPA678 may be
used in all op amp applications requiring high speed
and precision.
Low distortion and crosstalk make this amplifier suit-
able for RF and video applications.
The OPA678 is available in plastic DIP and SO-16
packages.
Input A
–
+
A/B Channel
Select Input
(TTL or ECL)
Input B
–
+
A
Enable
A
Enable
B
B
Output
Compensation
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
©1992 Burr-Brown Corporation
PDS-11136E
OPA678Printed in U.S.A. March, 1998
®
1 page  
TYPICAL PERFORMANCE CURVES
NOMINAL FREQUENCY COMPENSATION vs NOISE GAIN
10
8
6
4
2
0
1 2 4 6 8 10 20 40 60 80100
Noise Gain (V/V)
AV = +1V/V CLOSED-LOOP
SMALL SIGNAL BANDWIDTH
0
Gain
–1
–2
–3 BW = 200MHz
φ = 57°
–4 CC = 8.5pF
–5
φ
–6
–7
–8
–9
–10
1MHz
10MHz
100MHz
Frequency (Hz)
0
–20
–40
–60
–80
–100
–120
–140
–160
–180
16Hz
AV = +2V/V CLOSED-LOOP
SMALL SIGNAL BANDWIDTH
8
7
Gain
6
5
4
3 BW = 103MHz
φ = 103°
2 CC = 3pF
1
φ
0
–1
–2
1MHz
10MHz
100MHz
Frequency (Hz)
60
40
20
0
–20
–40
–60
–80
–100
–120
–140
16Hz
AV = +5V/V CLOSED-LOOP
SMALL SIGNAL BANDWIDTH
15
14 Gain
13
12
11
10 BW = 69MHz
φ = 119°
9 CC = 1pF
8
φ
7
6
5
1MHz
10MHz
100MHz
Frequency (Hz)
60
40
20
0
–20
–40
–60
–80
–100
–120
–140
16Hz
DIFFERENTIAL GAIN vs CLOSED-LOOP GAIN
(f = 4.5MHz)
0.5
0.4
0.3
0.2 VO = 0V to 2.1V
0.1 VO = 0V to 1.4V
VO = 0V to 0.7V
0
12 3 4 5
Closed-Loop Gain
NOTE: For the gain of +2V/V, CC = 2.2pF; for the gain of +5V/V, CC = 0.
DIFFERENTIAL PHASE vs CLOSED-LOOP GAIN
(f = 4.5MHz)
0.5
0.4
0.3
0.2
VO = 0V to 2.1V
VO = 0V to 1.4V
0.1
0 VO = 0V to 0.7V
12 3 4 5
Closed-Loop Gain
NOTE: For the gain of +2V/V, CC = 2.2pF; for the gain of +5V/V, CC = 0.
®
5 OPA678
5 Page 
R1 R2
Input
+5V
75Ω
NC
NC
CC
(1)
3
2
–
45
NC
+A
1
6
OPA678
7
8
16
15
+
–
9
10
B
12 11
NC
13
14 (1)
–5V
1µF
Tantalum
1µF
Tantalum
75Ω Output
VOLTAGE GAIN R1 R2 CC
V/V dB Ω Ω pF
+1 0 ∞ 100 8
+2 6 500 500 3
NOTE: (1) 0.1µF, Ceramic Mono-block,
Located at Package Pin.
FIGURE 8. OPA678 used as Conventional Op Amp. A wideband video amplifier with 75Ω input and output impedance.
R1
Input 1
Input 2
R1
R2
+5V
NC
NC
CC
(1)
3
2
–
45
NC
+A
1
6
OPA678
7
8
16
15
+
–
9
10
B
12 11
NC
13
14 (1)
TTL
R2
–5V
1µF
Tantalum
1µF
Tantalum
Output
VOLTAGE GAIN R1 R2 CC
V/V Ω Ω pF
+1 ∞ 100 8
+2 300 300 3
+4 100 300 1
+8 50 350 0
NOTE: (1) 0.1µF, Ceramic Mono-block,
Located at Package Pin.
FIGURE 9. Two Input Multiplexer with Gain. This circuit can be used to multiplex I & Q signals into one sampling ADC.
®
11 OPA678
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet OPA678.PDF ] | |
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