參數(shù)資料
型號(hào)： OPA3691IDBQR
英文描述： Current-Feedback Operational Amplifier
中文描述： 電流反饋運(yùn)算放大器
文件頁(yè)數(shù)： 1/25頁(yè)
文件大小： 448K
代理商： OPA3691IDBQR
OPA3684
www.ti.com
Copyright 2002, Texas Instruments Incorporated
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.
SBOS241A – MAY 2002 – REVISED SEPTEMBER 2002
Low-Power, Triple Current-Feedback
OPERATIONAL AMPLIFIER With Disable
FEATURES
G
MINIMAL BANDWIDTH CHANGE VERSUS GAIN
G
170MHz BANDWIDTH: G = +2
G
> 120MHz BANDWIDTH TO GAIN > +10
G
LOW DISTORTION: < –82dBc at 5MHz
G
HIGH OUTPUT CURRENT: 120mA
G
SINGLE +5V TO +12V SUPPLY OPERATION
G
DUAL
±
2.5V TO
±
6.0V SUPPLY OPERATION
G
LOW SUPPLY CURRENT: 1.7mA/ch
G
LOW SHUTDOWN CURRENT: 100
μ
A/ch
V+
V
O
V
–
I
ERR
R
G
R
F
Z
(S)
I
ERR
1 of 3 Channels
+
Low-Power
Amplifier
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
APPLICATIONS
G
RGB LINE DRIVERS
G
LOW-POWER BROADCAST VIDEO DRIVERS
G
EQUALIZING FILTERS
G
MULTICHANNEL SUMMING AMPLIFIERS
G
PROFESSIONAL CAMERAS
G
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 50
. 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 100
μ
A/ch while the I/O pins go to a high
impedance state.
6
3
0
–
3
–
6
–
9
–
12
–
15
–
18
–
21
–
24
N
R
F
= 800
G = 100
G = 50
G = 20
G = 10
G = 2
G = 1
10
100
200
BW (MHz) vs GAIN
G = 5
MHz
Patent Pending
OPA3684
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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OPA3691IDBQRG4 功能描述:高速運(yùn)算放大器 Triple Wideband Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
OPA3691IDBQT 功能描述:高速運(yùn)算放大器 Triple Wideband Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
OPA3691IDBQTG4 功能描述:高速運(yùn)算放大器 Triple Wideband Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
OPA3691IDG4 功能描述:高速運(yùn)算放大器 Triple Wideband Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
OPA3691IDR 功能描述:高速運(yùn)算放大器 Triple Wideband Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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