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參數(shù)資料
| 型號： | OPA3695 |
| 英文描述： | Wideband, Low-Power, Current Feedback Operational Amplifier |
| 中文描述： | 寬帶，低功耗，電流反饋運算放大器 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 382K |
| 代理商： | OPA3695 |
"#$
SBOS319C SEPTEMBER 2004 REVISED NOVEMBER 2004
www.ti.com
11
ADC DRIVER
Most
converters (ADCs), such as Texas Instruments ADS522x
series, require a low-noise, low-distortion driver. The
OPA694 combines low-voltage noise (2.1nV/
√
Hz) with low
harmonic distortion. Figure 3 shows an example of a
wideband, AC-coupled, 12-bit ADC driver.
modern,
high-performance
analog-to-digital
Two OPA694s are used in the circuit of Figure 3 to form a
differential driver for the ADS5220. The two OPA694s offer
> 250MHz bandwidth at a differential gain of 5V/V, with a
2V
PP
output swing. A 2nd-order RLC filter is used in order
to limit the noise from the amplifier and provide some
attenuation for higher-frequency harmonic distortion.
WIDEBAND INVERTING SUMMING AMPLIFIER
Since the signal bandwidth for a current-feedback op amp
can be controlled independently of the noise gain (NG,
which is normally the same as the noninverting signal
gain), wideband inverting summing stages may be
implemented using the OPA694. The circuit in Figure 4
shows an example inverting summing amplifier, where the
resistor values have been adjusted to maintain both
maximum bandwidth and input impedance matching. If
each RF signal is assumed to be driven from a 50
source,
the NG for this circuit will be (1 + 100
/(100
/5)) = 6. The
total feedback impedance (from V
O
to the inverting error
current) is the sum of R
F
+ (R
I
NG). where R
I
is the
impedance looking into the inverting input from the
summing junction (see the
Setting Resistor Values to
Optimize Performance
section). Using 100
feedback (to
get a signal gain of –2 from each input to the output pin)
requires an additional 30
in series with the inverting input
to increase the feedback impedance. With this resistor
added to the typical internal R
I
= 30
, the total feedback
impedance is 100
+ (60
6) = 460
, which is equal to
the required value to get a maximum bandwidth flat
frequency response for NG = 6.
SingletoDifferential
Gain of 10
Powersupply decoupling not shown.
OPA694
L
+5V
L
R
1
R
1
R
2
R
2
C
V
V+
12Bit
40MSPS
ADS5220
OPA694
500
5V
0.1
μ
F
25
100
100
500
C
1
C
1
V
I
50
1:2
25
V
CM
Figure 3. Wideband, AC-Coupled, Low-Power ADC Driver
100
50
OPA694
+5V
DIS
5V
V
O
=
(V
1
+ V
2
+ V
3
+ V
4
+ V
5
)
100MHz,
1dB Compression = 15dBm
50
V
2
50
V
3
50
V
4
50
V
1
50
RG58
50
V
5
30
Figure 4. 200MHz RF Summing Amplifier
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA694 | Wideband, Low-Power, Current Feedback Operational Amplifier |
| OPA695 | Wideband, Low-Power, Current Feedback Operational Amplifier |
| OPA3684 | Wideband, Low-Power, Current Feedback Operational Amplifier |
| OPA2683 | Wideband, Low-Power, Current Feedback Operational Amplifier |
| OPA2684 | Wideband, Low-Power, Current Feedback Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA3695EVM | 功能描述:放大器 IC 開發(fā)工具 OPA3695EVM Eval Mod RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| OPA3695IDBQ | 功能描述:運算放大器 - 運放 Ultra-WB Crnt-Feed back Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA3695IDBQG4 | 功能描述:運算放大器 - 運放 Ultra-WB Current- Feedback Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA3695IDBQR | 功能描述:運算放大器 - 運放 Ultra-WB Crnt-Feed back Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| OPA3695IDBQRG4 | 功能描述:運算放大器 - 運放 Ultra-WB Current- Feedback Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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