參數(shù)資料
型號(hào)： OPA2690IDBV
英文描述： Dual, Wideband, Voltage-Feedback OPERATIONAL AMPLIFIER with Disable
中文描述： 雙路，寬帶，電壓反饋運(yùn)算放大器具有禁用
文件頁數(shù)： 15/30頁
文件大?。?/td> 494K
代理商： OPA2690IDBV
"#$%
SBOS238D JUNE 2002 REVISED DECEMBER 2004
www.ti.com
15
HIGH-PERFORMANCE DAC
TRANSIMPEDANCE AMPLIFIER
High-frequency
DDS
(DACs) require a low distortion output amplifier to retain
their SFDR performance into real-world loads. Figure 5
shows a single-ended output drive implementation. The
diagram shows the signal output current(s) connected into
the virtual ground summing junction(s) of the OPA2690,
which is set up as a transimpedance stage or I
-
V converter.
If the DAC requires that its outputs terminate to a
compliance voltage other than ground for operation, the
appropriate voltage level may be applied to the
noninverting input of the OPA2690. The DC gain for this
circuit is equal to R
F
. At high frequencies, the DAC output
capacitance (C
D
in Figure 5) will produce a zero in the
noise gain for the OPA2690 that may cause peaking in the
closed-loop frequency response. C
F
is added across R
F
to
compensate for this noise gain peaking. To achieve a flat
transimpedance frequency response, the pole in each
feedback network should be set to:
Digital-to-Analog
Converters
1
2 R
F
C
F
GBP
4 R
F
C
D
which will give a cutoff frequency f
3dB
of approximately:
f
3dB
GBP
2 R
F
C
D
1/2
OPA2690
1/2
OPA2690
HighSpeed
DAC
V
O
= I
O
R
F
V
O
=
I
O
R
F
R
F1
R
F2
C
F1
C
F2
GBP
→
Gain Bandwidth
Product (Hz) for the OPA2690
C
D1
C
D2
I
O
I
O
50
50
Figure 5. DAC Transimpedance Amplifier
WIDEBAND VIDEO MULTIPLEXING
One common application for video speed amplifiers that
include a disable pin is to wire multiple amplifier outputs
together, then select which one of several possible video
inputs to source onto a single line. This simple wired-OR
video multiplexer can be easily implemented using the
OP2690I-14D (SO-14 package only), as shown in
Figure 6.
146
2k
82.5
75
Cable
75
Load
RG59
82.5
75
402
340
Video 1
+5V
+5V
5V
1/2
OPA2690
1/2
OPA2690
146
2k
75
402
340
Video 2
5V
+5V
V
DIS
DISA
DISB
Figure 6. 2-Channel Video Multiplexer (SO-14 package only)
(1)
(2)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OPA2690IDG4 功能描述:高速運(yùn)算放大器 Dual Wideband Voltage 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
OPA2690IDR 功能描述:高速運(yùn)算放大器 Dual Wide Band 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
OPA2690IDRG4 功能描述:高速運(yùn)算放大器 Dual Wideband Voltage 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
OPA2691I-14D 功能描述:高速運(yùn)算放大器 Dual 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
OPA2691I-14DG4 功能描述:高速運(yùn)算放大器 Dual 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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