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參數(shù)資料
| 型號： | OPA675 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Wideband Switched-Input Operational Amplifier(寬帶轉(zhuǎn)換輸入運算放大器) |
| 中文描述： | 寬帶開關(guān)輸入運算放大器（寬帶轉(zhuǎn)換輸入運算放大器） |
| 文件頁數(shù)： | 7/13頁 |
| 文件大?。?/td> | 198K |
| 代理商： | OPA675 |
OPA675/676
7
110
100
90
80
70
60
50
–50
–25
+50
+125
A
Temperature (°C)
0
+25
+75
+100
CMR
PSR
A
OL
O
OPEN-LOOP GAIN, CMR AND PSR vs TEMPERATURE
1
2
100
C
Noise Gain (V/V)
10
3
4 5 6
8
20
30
50
70
35
30
25
20
15
10
5
0
NOMINAL FREQUENCY COMPENSATION vs NOISE GAIN
0
–15
–30
–45
–60
–75
–90
–105
–120
0.3
1
1000
C
Frequency (MHz)
10
100
10.0MHz
–68.3dB
CHANNEL-TO-CHANNEL
CROSSTALK vs FREQUENCY
TYPICAL PERFORMANCE CURVES
(CONT)
THEORY OF OPERATION
An OPA675 simplified circuit is shown in Figure 1. It is a
“classical” high-speed op-amp architecture with one impor-
tant exception — the amplifier has two ECL logic selectable
differential input stages. An appropriate differential ECL
logic signal on A and A (labeled B Select) will turn on either
Q5 or Q6, steering operating (tail) current to either differen-
tial input pair Q1 and Q2 or Q3 and Q4. The input pair
receiving the tail current operates as a conventional op-amp
input stage while the de-selected input pair receiving no tail
current appears as an open circuit. The de-selected inputs
have only a few pF parasitic capacitance and in the off
condition exhibit only a very low leakage (bias) current of
about 100pA. Two feedback networks can be connected to
each input separately allowing a wide range of circuit
applications. The feedback network connected to the se-
lected input operates in a normal op amp fashion while the
feedback network connected to the de-selected input is
totally inactive, appearing only as an additional load to the
amplifier’s output stage.
The switched-input op amp (SWOP AMP)
circuit of the
OPA676 is basically the same as the OPA675 but a TTL
compatible level shifter (Figure 2) has been added to its input
selection logic circuit.
Standard TTL (OPA676) and ECL (OPA675) logic levels
may be applied to each input selection circuit but only
2
4
8
12
Frequency (MHz)
6
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
O
Gain = +10V/V
V
OUT
= 500mVp-p
R
L
= 50
2.5MHz SMALL-SIGNAL
HARMONIC DISTORTION SPECTRUM
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OPA676 | Wideband Switched-Input Operational Amplifier(寬帶轉(zhuǎn)換輸入運算放大器) |
| OPA676JG | Wideband Switched-Input OPERATIONAL AMPLIFIER |
| OPA676KG | Wideband Switched-Input OPERATIONAL AMPLIFIER |
| OPA676SG | Wideband Switched-Input OPERATIONAL AMPLIFIER |
| OPA703NA | CMOS, Rail-to-Rail, I/O OPERATIONAL AMPLIFIERS |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA675/OPA676 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:OPA675. OPA676 - DISCONTINUED PRODUCT. No longer recommended for new design. |
| OPA675JG | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Wideband Switched-Input OPERATIONAL AMPLIFIER |
| OPA675KG | 制造商: 功能描述: 制造商:undefined 功能描述: |
| OPA675SG | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Wideband Switched-Input OPERATIONAL AMPLIFIER |
| OPA676 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Wideband Switched-Input OPERATIONAL AMPLIFIER |
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