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PDF OPA3684 Data sheet ( Hoja de datos )
| Número de pieza | OPA3684 | |
| Descripción | Wideband / Low-Power / Current Feedback Operational Amplifier | |
| Fabricantes | Burr-Brown | |
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OPA3684
OPA3684
SBOS241A – MAY 2002 – REVISED SEPTEMBER 2002
Low-Power, Triple Current-Feedback
OPERATIONAL AMPLIFIER With Disable
FEATURES
q MINIMAL BANDWIDTH CHANGE VERSUS GAIN
q 170MHz BANDWIDTH: G = +2
q > 120MHz BANDWIDTH TO GAIN > +10
q LOW DISTORTION: < –82dBc at 5MHz
q HIGH OUTPUT CURRENT: 120mA
q SINGLE +5V TO +12V SUPPLY OPERATION
q DUAL ±2.5V TO ±6.0V SUPPLY OPERATION
q LOW SUPPLY CURRENT: 1.7mA/ch
q LOW SHUTDOWN CURRENT: 100µA/ch
DESCRIPTION
The OPA3684 provides a new level of performance in low-power,
wideband, current-feedback (CFB) amplifiers. This CFBPLUS am-
plifier among the first to use an internally closed-loop input buffer
stage that enhances performance significantly over earlier low-
power CFB amplifiers. While retaining the benefits of very low
power operation, this new architecture provides many of the
benefits of a more ideal CFB amplifier. The closed-loop input stage
buffer gives a very low and linearized impedance path at the
inverting input to sense the feedback error current. This improved
inverting input impedance retains exceptional bandwidth to much
higher gains and improves harmonic distortion over earlier solu-
tions limited by inverting input linearity. Beyond simple high-gain
applications, the OPA3684 CFBPLUS amplifier permits the gain
setting element to be set with considerable freedom from amplifier
bandwidth interaction. This allows frequency response peaking
elements to be added, multiple input inverting summing circuits to
APPLICATIONS
q RGB LINE DRIVERS
q LOW-POWER BROADCAST VIDEO DRIVERS
q EQUALIZING FILTERS
q MULTICHANNEL SUMMING AMPLIFIERS
q PROFESSIONAL CAMERAS
q ADC INPUT DRIVERS
have greater bandwidth, and low-power line drivers to meet the
demanding requirements of studio cameras and broadcast video.
The output capability of the OPA3684 also sets a new mark in
performance for low-power current-feedback amplifiers. Delivering
a full ±4Vp-p swing on ±5V supplies, the OPA3684 also has the
output current to support > ±3Vp-p into 50Ω. This minimal output
headroom requirement is complemented by a similar 1.2V input
stage headroom giving exceptional capability for single +5V opera-
tion.
The OPA3684’s low 1.7mA/ch supply current is precisely trimmed
at 25°C. This trim, along with low shift over temperature and supply
voltage, gives a very robust design over a wide range of operating
conditions. System power may be further reduced by using the
optional disable control pin. Leaving this disable pin open, or holding
it HIGH, gives normal operation. If pulled LOW, the OPA3684 supply
current drops to less than 100µA/ch while the I/O pins go to a high
impedance state.
1 of 3 Channels
V+
+
VO
V–
IERR
Z(S) IERR
RF
RG
Low-Power
Amplifier
Patent Pending
6
3
0
–3
–6
–9
–12
–15
–18
–21 RF = 800Ω
–24
10
BW (MHz) vs GAIN
G=1
G=2
G=5
G = 10
G = 20
G = 50
G = 100
100
MHz
200
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 Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2002, Texas Instruments Incorporated
1 page  
TYPICAL CHARACTERISTICS: VS = ±5V
At TA = +25°C, G = +2, RF = 800Ω, and RL = 100Ω, unless otherwise noted.
NONINVERTING SMALL-SIGNAL
FREQUENCY RESPONSE
6
VO = 0.5Vp-p
3 RF = 800Ω
0
G=1
G=2
–3
–6
–9
–12
–15
–18
1
See Figure 1
G=5
G = 10
G = 20
G = 50
G = 100
10
Frequency (MHz)
100 200
INVERTING SMALL-SIGNAL FREQUENCY RESPONSE
3
VO = 0.5Vp-p
RF = 800Ω
0
–3
–6
–9
See Figure 2
–12
1
G = –1
G = –2
G = –5
G = –10
G = –16
10
Frequency (MHz)
100 200
NONINVERTING LARGE-SIGNAL
FREQUENCY RESPONSE
9
G = +2
RL = 100Ω
VO = 0.5Vp-p
6
VO = 1Vp-p
3
0
See Figure 1
–3
1
VO = 2Vp-p
VO = 5Vp-p
10
Frequency (MHz)
100 200
INVERTING LARGE-SIGNAL FREQUENCY RESPONSE
3
G = –1
RL = 100Ω
0
VO = 0.5Vp-p
1Vp-p
–3
2Vp-p
5Vp-p
–6
–9
See Figure 2
–12
1
10
Frequency (MHz)
100 200
NONINVERTING PULSE RESPONSE
0.8
G = +2
0.6
0.4
Large-Signal Right Scale
0.2
Small-Signal Left Scale
0
–0.2
–0.4
–0.6
See Figure 1
–0.8
Time (10ns/div)
1.6
1.2
0.8
0.4
0
–0.4
–0.8
–1.2
–1.6
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
INVERTING PULSE RESPONSE
G = –1
Small-Signal Left Scale
Large-Signal Right Scale
See Figure 2
Time (10ns/div)
1.6
1.2
0.8
0.4
0
–0.4
–0.8
–1.2
–1.6
OPA3684
SBOS241A
www.ti.com
5
5 Page 
TYPICAL CHARACTERISTICS: VS = +5V (Cont.)
At TA = +25°C, G = +2, RF = 1kΩ, and RL = 100Ω, unless otherwise noted.
HARMONIC DISTORTION vs LOAD RESISTANCE
–50
VO = 2Vp-p
–55 f = 5MHz
–60
3rd-Harmonic
–65
–70
–75
–80
–85
See Figure 3
–90
100
2nd-Harmonic
Load Resistance (Ω)
1k
HARMONIC DISTORTION vs FREQUENCY
–50
VO = 2Vp-p
RL = 100Ω
–60
2nd-Harmonic
–70
3rd-Harmonic
–80
See Figure 3
–90
0.1
1
Frequency (MHz)
10 20
HARMONIC DISTORTION vs OUTPUT VOLTAGE
–50
2nd-Harmonic
–60
–70 3rd-Harmonic
–80
See Figure 3
–90
0.5
1
Output Voltage (Vp-p)
2
3
2-TONE, 3RD-ORDER
INTERMODULATION DISTORTION
–50
20MHz
–60
10MHz
–70
5MHz
–80
See Figure 3
–90
–15 –14 –13 –12 –11 –10 –9 –8 –7 –6 –5 –4 –3
Power at Load (each tone, dBm)
SUPPLY AND OUTPUT CURRENT
vs AMBIENT TEMPERATURE
100 1.5
Right-Scale
90 Supply Current
1.4
80
Left-Scale
1.3
Sourcing Output Current
70 1.2
Left-Scale
Sinking Output Current
60 1.1
50
–50
–25
0 25 50 75
Ambient Temperature (°C)
1.0
100 125
0.16
0.14
COMPOSITE VIDEO DIFFERENTIAL GAIN/PHASE
G = +2
NTSC, Positive Video
0.12
0.10
0.08
dP
0.06
0.04
0.02
dG
0
1234
Number of 150Ω Video Loads
OPA3684
SBOS241A
www.ti.com
11
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet OPA3684.PDF ] | |
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