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參數(shù)資料
| 型號(hào)： | OPA635U |
| 英文描述： | Wideband, Single Supply OPERATIONAL AMPLIFIERS |
| 中文描述： | 寬帶，單電源運(yùn)算放大器 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大小： | 179K |
| 代理商： | OPA635U |
11
OPA634, OPA635
APPLICATIONS INFORMATION
WIDEBAND VOLTAGE FEEDBACK OPERATION
The OPA634 and OPA635 are unity-gain stable, very high
speed voltage feedback op amps designed for single supply
operation (+3V to +5V). The input stage supports input
voltages below ground, and within 1.2V of the positive
supply. The complementary common-emitter output stage
provides an output swing to within 30mV of ground and
140mV of the positive supply. They are compensated to
provide stable operation with a wide range of resistive loads.
The OPA635’s internal disable circuitry is designed to
minimize supply current when disabled.
Figure 1 shows the AC-coupled, gain of +2 configuration
used for the +5V Specifications and Typical Performance
Curves. For test purposes, the input impedance is set to 50
with a resistor to ground. Voltage swings reported in the
Specifications are taken directly at the input and output pins.
For the circuit of Figure 1, the total effective load on the
output at high frequencies is 150
|| 1500
. The disable pin
needs to be driven by a low impedance source, such as a
CMOS inverter. The 1.50k
resistors at the non-inverting
input provide the common-mode bias voltage. Their parallel
combination equals the DC resistance at the inverting input,
minimizing the DC offset.
SINGLE SUPPLY ADC CONVERTER INTERFACE
The front page shows a DC-coupled, single supply ADC
driver circuit. Many systems are now requiring +3V supply
capability of both the ADC and its driver. The OPA635
provides excellent performance in this demanding applica-
tion. Its large input and output voltage ranges, and low
distortion, support converters such as the ADS900 shown in
this figure. The input level-shifting circuitry was designed
so that V
IN
can be between 0V and 0.5V, while delivering an
output voltage of 1V to 2V for the ADS900. Both the
OPA635 and ADS900 have power reduction pins with the
same polarity for those systems that need to conserve power.
DC LEVEL SHIFTING
Figure 3 shows a DC-coupled non-inverting amplifier that
level-shifts the input up to accommodate the desired output
voltage range. Given the desired signal gain (G), and the
amount V
OUT
needs to be shifted up (
V
OUT
) when V
IN
is at
the center of its range, the following equations give the
resistor values that produce the best DC offset.
NG = G +
V
OUT
/V
S
R
1
= R
4
/G
R
2
= R
4
/(NG – G)
R
3
= R
4
/(NG –1)
where:
NG = 1 + R
4
/R
3
V
OUT
= (G)V
IN
+ (NG – G)V
S
Make sure that V
IN
and V
OUT
stay within the specified input
and output voltage ranges.
Figure 2 shows the DC-coupled, gain of +2 configuration
used for the +3V Specifications and Typical Performance
Curves. For test purposes, the input impedance is set to 50
with a resistor to ground. Though not strictly a “rail-to-rail”
design, these parts come very close, while maintaining
excellent performance. They will deliver
≤
2.8Vp-p on a
single +3V supply with 110MHz bandwidth. The 374
and
2.26k
resistors at the input level-shift V
IN
so that V
OUT
is
within the allowed output voltage range when V
IN
= 0. See
the Typical Performance Curves for information on driving
capacitive loads.
FIGURE 1. AC-Coupled Signal—Resistive Load to Supply
Midpoint.
FIGURE 2. DC-Coupled Signal—Resistive Load to Supply
Midpoint.
OPA63x
+V
S
= 5V
DIS (OPA635 only)
V
OUT
53.6
V
IN
750
1.50k
1.50k
R
L
150
+V
S
2
750
6.8
μ
F
+
0.1
μ
F
0.1
μ
F
0.1
μ
F
+
OPA63x
+V
S
= 3V
DIS (OPA635 only)
V
OUT
57.6
V
IN
562
374
2.26k
R
L
150
+V
S
2
750
6.8
μ
F
+
0.1
μ
F
+
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA635U/2K5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| OPA637 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Precision High-Speed Difet OPERATIONAL AMPLIFIERS |
| OPA637AM | 功能描述:高速運(yùn)算放大器 Prec High-Speed Difet Oper 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 |
| OPA637AM2 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Precision High-Speed Difet OPERATIONAL AMPLIFIERS |
| OPA637AP | 功能描述:高速運(yùn)算放大器 Prec High-Speed Difet Oper 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 |
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