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OPA3684ID Datasheet

  • OPA3684ID

  • Operational Amplifier

  • 25頁(yè)

  • ETC

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OPA3684
OPA
368
4
SBOS241A 鈥?MAY 2002 鈥?REVISED SEPTEMBER 2002
Low-Power, Triple Current-Feedback
OPERATIONAL AMPLIFIER With Disable
FEATURES
q
q
q
q
q
q
q
q
q
MINIMAL BANDWIDTH CHANGE VERSUS GAIN
170MHz BANDWIDTH: G = +2
> 120MHz BANDWIDTH TO GAIN > +10
LOW DISTORTION: < 鈥?2dBc at 5MHz
HIGH OUTPUT CURRENT: 120mA
SINGLE +5V TO +12V SUPPLY OPERATION
DUAL
鹵
2.5V TO
鹵
6.0V SUPPLY OPERATION
LOW SUPPLY CURRENT: 1.7mA/ch
LOW SHUTDOWN CURRENT: 100
碌
A/ch
APPLICATIONS
q
q
q
q
q
q
RGB LINE DRIVERS
LOW-POWER BROADCAST VIDEO DRIVERS
EQUALIZING FILTERS
MULTICHANNEL SUMMING AMPLIFIERS
PROFESSIONAL CAMERAS
ADC INPUT DRIVERS
DESCRIPTION
The OPA3684 provides a new level of performance in low-power,
wideband, current-feedback (CFB) amplifiers. This CFB
PLUS
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 CFB
PLUS
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
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
鹵4Vp-p
swing on
鹵5V
supplies, the OPA3684 also has the
output current to support >
鹵3Vp-p
into 50鈩? 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鈥檚 low 1.7mA/ch supply current is precisely trimmed
at 25擄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 100碌A(chǔ)/ch while the I/O pins go to a high
impedance state.
1 of 3 Channels
V+
BW (MHz) vs GAIN
6
3
Normalized Gain (3dB/div)
G=1
G=2
0
鈥?
鈥?
鈥?
鈥?2
鈥?5
鈥?8
鈥?1
鈥?4
10
G = 50
R
F
= 800鈩?/div>
G = 100
100
MHz
200
G = 10
G = 20
G=5
+
V
O
V鈥?/div>
I
ERR
R
F
Z
(S)
I
ERR
R
G
Low-Power
Patent Pending
Amplifier
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.
Copyright 漏 2002, Texas Instruments Incorporated
www.ti.com

OPA3684ID 產(chǎn)品屬性

  • 50

  • 集成電路 (IC)

  • Linear - Amplifiers - Instrumentation, OP Amps, Buffer Amps

  • -

  • 電流反饋

  • 3

  • -

  • 780 V/µs

  • 1.9GHz

  • 250MHz

  • 5µA

  • 1500µV

  • 1.7mA

  • 160mA

  • 5 V ~ 12 V，±2.5 V ~ 6 V

  • -40°C ~ 85°C

  • 表面貼裝

  • 14-SOIC（0.154"，3.90mm 寬）

  • 14-SOIC

  • 管件

  • 296-30907-ND - DEM-OPA-SO-3B

  • 296-13646-5

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