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參數(shù)資料
| 型號： | OP634 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Wideband, Single-Supply Operational Amplifier(寬帶,單電源運(yùn)算放大器) |
| 中文描述： | 寬帶，單電源運(yùn)算放大器（寬帶，單電源運(yùn)算放大器） |
| 文件頁數(shù)： | 11/18頁 |
| 文件大?。?/td> | 284K |
| 代理商： | OP634 |
OPA634, OPA635
SBOS097A
11
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 +10V). The input stage supports input
voltages below ground, and to 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,
(R
F
), minimizing the DC offset.
SINGLE SUPPLY ADC CONVERTER INTERFACE
The front page shows a DC-coupled, single-supply ADC
(Analog-to-Digital Converter) 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 application. 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 reduc-
tion pins with the same polarity for those systems that need
to conserve power.
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 70MHz 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
1.50k
1.50k
R
L
150
+V
S
2
6.8
μ
F
+
0.1
μ
F
0.1
μ
F
0.1
μ
F
R
F
750
R
G
750
OPA63x
+V
S
= 3V
DIS (OPA635 only)
V
OUT
57.6
V
IN
R
F
750
R
G
562
374
2.26k
R
L
150
+V
S
2
6.8
μ
F
+
0.1
μ
F
z
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