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| 型號： | OPA694IDR |
| 英文描述： | Wideband, Low-Power, Current Feedback Operational Amplifier |
| 中文描述： | 寬帶，低功耗，電流反饋運(yùn)算放大器 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 382K |
| 代理商： | OPA694IDR |
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SBOS319C SEPTEMBER 2004 REVISED NOVEMBER 2004
APPLICATION INFORMATION
www.ti.com
10
WIDEBAND CURRENT FEEDBACK OPERATION
The OPA694 provides exceptional AC performance for a
wideband, low-power, current-feedback operational
amplifier. Requiring only 5.8mA quiescent current, the
OPA694 offers a 690MHz bandwidth at a gain of +2, along
with a 1700V/
μ
s slew rate. An improved output stage
provides
±
80mA output drive, along with < 1.5V output
voltage headroom. This combination of low power and
high bandwidth can benefit high-resolution video
applications.
Figure 1 shows the DC-coupled, gain of +2, dual power-
supply circuit configuration used as the basis of the
±
5V
Electrical Characteristic tables and Typical Characteristic
curves. For test purposes, the input impedance is set to
50
with a resistor to ground and the output impedance is
set to 50
with a series output resistor. Voltage swings
reported in the Electrical Charateristics are taken directly
at the input and output pins, while load powers (dBm) are
defined at a matched 50
load. For the circuit of Figure 1,
the total effective load will be 100
|| 804
= 89
. One
optional component is included in Figure 1. In addition to
the usual power-supply decoupling capacitors to ground,
a 0.1
μ
F capacitor is included between the two
power-supply pins. In practical PC board layouts, this
optional added capacitor will typically improve the
2nd-harmonic distortion performance by 3dB to 6dB.
OPA694
+5V
+
5V
V
S
+V
S
50
Load
50
50
V
O
V
I
50
Source
R
G
402
R
F
402
+
6.8
μ
F
0.1
μ
F
6.8
μ
F
0.1
μ
F
0.1
μ
F
Figure 1. DC-Coupled, G = +2, Bipolar-Supply
Specification and Test Circuit
Figure 2 shows the DC-coupled, gain of 2V/V, dual
power-supply circuit used as the basis of the inverting
Typical Characteristic curves. Inverting operation offers
several performance benefits. Since there is no
common-mode signal across the input stage, the slew rate
for inverting operation is higher and the distortion
performance is slightly improved. An additional input
resistor, R
T
, is included in Figure 2 to set the input
impedance equal to 50
. The parallel combination of R
T
and R
G
sets the input impedance. Both the noninverting
and inverting applications of Figure 1 and Figure 2 will
benefit from optimizing the feedback resistor (R
F
) value for
bandwidth (see the discussion in
Setting Resistor Values
to Optimize Bandwidth
). The typical design sequence is to
select the R
F
value for best bandwidth, set R
G
for the gain,
then set R
T
for the desired input impedance. As the gain
increases for the inverting configuration, a point will be
reached where R
G
will equal 50
, where R
T
is removed
and the input match is set by R
G
only. With R
G
fixed to
achieve an input match to 50
, R
F
is simply increased, to
increase gain. This will, however, quickly reduce the
achievable bandwidth, as shown by the inverting gain of
–10 frequency response in the Typical Characteristic
curves. For gains > 10V/V (14dB at the matched load),
noninverting operation is recommended to maintain
broader bandwidth.
OPA694
+5V
+V
S
V
S
5V
50
Load
50
20
R
66.5
R
G
200
+
6.8
μ
F
0.1
μ
F
+
6.8
μ
F
0.1
μ
F
Optional
0.01
μ
F
V
I
50
Source
R
F
402
V
O
Figure 2. DC-Coupled, G = 2V/V, Bipolar-Supply
Specification and Test Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA694IDRG4 | 功能描述:高速運(yùn)算放大器 WideBand Low-Power Curr Feedback Amp 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 |
| OPA695 | 制造商:BB 制造商全稱:BB 功能描述:Wideband, Low-Power, Current Feedback Operational Amplifier |
| OPA695ID | 功能描述:高速運(yùn)算放大器 Ultra-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 |
| OPA695ID | 制造商:Texas Instruments 功能描述:IC SM OP-AMP WIDEBAND CFB |
| OPA695IDBVR | 功能描述:高速運(yùn)算放大器 Ultra-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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