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參數(shù)資料
| 型號： | OPA2348AI |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 1MHz, 45レA, CMOS, Rail-to-Rail OPERATIONAL AMPLIFIERS |
| 中文描述： | 1MHz的，45レ甲型，CMOS，軌至軌運算放大器 |
| 文件頁數(shù)： | 7/17頁 |
| 文件大小： | 329K |
| 代理商： | OPA2348AI |
OPA348, 2348, 4348
SBOS213C
7
www.ti.com
FIGURE 3. OPA348
—
No Phase Inversion with Inputs Greater
than the Power-Supply Voltage.
APPLICATIONS INFORMATION
OPA348 series op amps are unity-gain stable and suitable
for a wide range of general-purpose applications.
The OPA348 series features wide bandwidth and unity-gain
stability with rail-to-rail input and output for increased dynamic
range. Figure 1 shows the input and output waveforms for the
OPA348 in unity-gain configuration. Operation is from a single
+5V supply with a 100k
load connected to V
S
/2. The input is
a 5Vp-p sinusoid. Output voltage is approximately 4.98Vp-p.
Power-supply pins should be bypassed with 0.01
μ
F ceramic
capacitors.
on the high end. Within the 200mV transition region PSRR,
CMRR, offset voltage, offset drift, and THD may be degraded
compared to operation outside this region.
FIGURE 1. The OPA348 Features Rail-to-Rail Input/Output.
5V
1
0V
G = +1V/V, V
S
= +5V
20
μ
s/div
Output (Inverted on Scope)
OPERATING VOLTAGE
OPA348 series op amps are fully specified and tested from
+2.5V to +5.5V. However, supply voltage may range from
+2.1V to +5.5V. Parameters are tested over the specified
supply range
—
a unique feature of the OPA348 series. In
addition, all temperature specifications apply from
–
40
°
C to
+125
°
C. Most behavior remains virtually unchanged through-
out the full operating voltage range. Parameters that vary
significantly with operating voltages or temperature are shown
in the Typical Characteristics.
COMMON-MODE VOLTAGE RANGE
The input common-mode voltage range of the OPA348 series
extends 200mV beyond the supply rails. This is achieved
with a complementary input stage
—
an N-channel input differ-
ential pair in parallel with a P-channel differential pair. The
N-channel pair is active for input voltages close to the positive
rail, typically (V+)
–
1.2V to 300mV above the positive supply,
while the P-channel pair is on for inputs from 300mV below the
negative supply to approximately (V+)
–
1.4V. There is a small
transition region, typically (V+)
–
1.4V to (V+)
–
1.2V, in which
both pairs are on. This 200mV transition region, shown in
Figure 2, can vary
±
300mV with process variation. Thus, the
transition region (both stages on) can range from (V+)
–
1.7V
to (V+)
–
1.5V on the low end, up to (V+)
–
1.1V to (V+)
0.9V
RAIL-TO-RAIL INPUT
The input common-mode range extends from (V
–
)
–
0.2V to
(V+) + 0.2V. For normal operation, inputs should be limited to
this range. The absolute maximum input voltage is 500mV
beyond the supplies. Inputs greater than the input common-
mode range but less than the maximum input voltage, while not
valid, will not cause any damage to the op amp. Unlike some
other op amps, if input current is limited the inputs may go
beyond the power supplies without phase inversion, as shown
in Figure 3.
5V
1
0V
G = +1V/V, V
S
= +5V
10
μ
V
IN
V
OUT
–
0.5
O
Common-Mode Voltage (V)
OFFSET VOLTAGE
vs FULL COMMON-MODE VOLTAGE RANGE
0
V
–
0.5
1.5
1
2.5
2
3.5
3
4.5
5
4
5.5
2
1.5
1
0.5
0
–
0.5
–
1
–
1.5
–
2
V+
FIGURE 2. Behavior of Typical Transition Region at Room
Temperature.
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