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PDF OPA860 Data sheet ( Hoja de datos )
| Número de pieza | OPA860 | |
| Descripción | Wide Bandwidth OPERATIONAL TRANSCONDUCTANCE AMPLIFIER (OTA) and BUFFER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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BurrĆBrown Products
from Texas Instruments
OPA860
Wide Bandwidth
OPERATIONAL TRANSCONDUCTANCE
AMPLIFIER (OTA) and BUFFER
SBOS331 – JUNE 2005
OTA FEATURES
• Wide Bandwidth (80MHz, Open-Loop, G = +5)
• High Slew Rate (900V/µs)
• High Transconductance (95mA/V)
• External IQ-Control
BUFFER FEATURES
• Closed-Loop Buffer
• Wide Bandwidth (1600MHz, VO = 1VPP)
• High Slew Rate (4000V/µs)
• 60mA Output Current
OPA860 FEATURES
• Low Quiescent Current (11.2mA)
• Versatile Circuit Function
APPLICATIONS
• Baseline Restore Circuits
• Video/Broadcast Equipment
• Communications Equipment
• High-Speed Data Acquisition
• Wideband LED Driver
• AGC-Multiplier
• ns-Pulse Integrator
• Control Loop Amplifier
• OPA660 Upgrade
DESCRIPTION
The OPA860 is a versatile monolithic component
designed for wide-bandwidth systems, including high
performance video, RF and IF circuitry. It includes a
wideband, bipolar operational transconductance
amplifier (OTA), and voltage buffer amplifier.
The OTA or voltage-controlled current source can be
viewed as an ideal transistor. Like a transistor, it has
three terminals—a high impedance input (base), a
low-impedance input/output (emitter), and the current
output (collector). The OTA, however, is self-biased
and bipolar. The output collector current is zero for a
zero base-emitter voltage. AC inputs centered about
zero produce an output current, which is bipolar and
centered about zero. The transconductance of the
OTA can be adjusted with an external resistor,
allowing bandwidth, quiescent current, and gain
trade-offs to be optimized.
Also included in the OPA860 is an uncommited
closed-loop, unity-gain buffer. This provides
1600MHz bandwidth and 4000V/µs slew rate.
Used as a basic building block, the OPA860 sim-
plifies the design of AGC amplifiers, LED driver
circuits for fiber optic transmission, integrators for fast
pulses, fast control loop amplifiers and control ampli-
fiers for capacitive sensors and active filters. The
OPA860 is available in an SO-8 surface-mount pack-
age.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005, Texas Instruments Incorporated
1 page  
OPA860
www.ti.com
SBOS331 – JUNE 2005
TYPICAL CHARACTERISTICS: VS = ±5V
At TA = +25°C, IQ = 11.2mA, and RL = 500Ω, unless otherwise noted. (See Figure 53.)
OTA + BUF Performance
SMALL-SIGNAL FREQUENCY RESPONSE
9 G = +2V/V
RL = 500Ω
6
3
0
VOUT = 0.5VPP
−3
VOUT = 0.2VPP
−6
−9
1M
10M
100M
Frequency (Hz)
Figure 1.
1G 2G
SMALL-SIGNAL FREQUENCY RESPONSE
vs QUIESCENT CURRENT
9
6
IQ = 12mA
3
0
−3
−6
G = +2V/V
RL = 500Ω
VO = 0.2VPP
−9
1M
IQ = 8mA
IQ = 9mA
IQ = 11.2mA
10M
100M
Frequency (Hz)
1G 2G
Figure 3.
SMALL-SIGNAL PULSE RESPONSE
150
100
50
0
−50
−100
−150
G = +2V/V
VIN = 0.125VPP
fIN = 20MHz
Time (5ns/div)
Figure 5.
LARGE-SIGNAL FREQUENCY RESPONSE
9 G = +2V/V
RL = 500Ω
6
3
0
−3
−6
−9
1M
VOUT = 1VPP
VOUT = 2VPP
VOUT = 5VPP
10M
100M
Frequency (Hz)
Figure 2.
1G 2G
GAIN FLATNESS vs QUIESCENT CURRENT
6.5
G = +2V/V
6.4 RL = 500Ω
6.3 VO = 0.2VPP
6.2
6.1
6.0
5.9
5.8
5.7
5.6
5.5
1
IQ = 11.2mA
IQ = 8mA
IQ = 12mA
IQ = 9mA
10
Frequency (MHz)
Figure 4.
100
LARGE-SIGNAL PULSE RESPONSE
1.5
1.0
0.5
0
−0.5
−1.0
−1.5
G = +2V/V
VIN = 1.25VPP
fIN = 20MHz
Time (5ns/div)
Figure 6.
5
5 Page 
OPA860
www.ti.com
TYPICAL CHARACTERISTICS: VS = ±5V (continued)
At TA = +25°C, IQ = 11.2mA, and RL = 500Ω, unless otherwise noted.
SBOS331 – JUNE 2005
BUFFER GROUP DELAY TIME vs FREQUENCY
1.2
1.0
0.8
0.6
0.4
0.2
0
−0.2
0
100 200 300 400 500 600 700 800 900 1000
Frequency (MHz)
Figure 36.
BUFFER OUTPUT VOLTAGE AND CURRENT LIMITATIONS
5
1W Internal
4 Power Limit
3 100Ω
Load Line
2
1 25Ω Load Line
0 50Ω Load Line
−1
−2
−3
−4
1W Internal
Power Limit
−5
Output Current (mA)
Figure 37.
QUIESCENT CURRENT vs TEMPERATURE
16
15
14
13
12
11
10
9
8
7
6
−40 −20
0 20 40 60 80
Ambient Temperature (_ C)
100 120
Figure 38.
POWER-SUPPLY REJECTION RATIO vs FREQUENCY
50
45
+PSRR
40
35
30
25
20
15
−PSRR
10
5
0
10k 100k
1M
10M
100M
Frequency (Hz)
Figure 39.
VOLTAGE RANGE vs TEMPERATURE
4.10
4.05
4.00
3.95
+VO
−VO
3.90
−40 −20
0 20 40 60 80
Ambient Temperature (_ C)
Figure 40.
100 120
56.0
55.8
55.6
55.4
55.2
55.0
54.8
54.6
54.4
54.2
54.0
−40
OUTPUT CURRENT vs TEMPERATURE
Output Current Sinking, Sourcing
−20 0
20 40 60 80 100
Temperature (_ C)
120
Figure 41.
11
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet OPA860.PDF ] | |
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