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參數(shù)資料
型號(hào): AD8027AR-REEL7
廠商: ANALOG DEVICES INC
元件分類: 音頻/視頻放大
英文描述: Low Distortion, High Speed Rail-to-Rail Input/Output Amplifiers
中文描述: 1 CHANNEL, VIDEO AMPLIFIER, PDSO8
封裝: MS-012AA, SOIC-8
文件頁數(shù): 20/24頁
文件大小: 478K
代理商: AD8027AR-REEL7
AD8027/AD8028
APPLICATIONS
Using the AD8027/AD8028 SELECT Pin
Rev. B | Page 20 of 24
The AD8027/AD8028 features a unique SELECT pin with two
functions. The first is a power-down function that places the
AD8027/AD8028 into low power consumption mode. In the
power-down mode, the amplifier draws 450 μA (typ) of supply
current.
The second function, as mentioned in the Theory of Operation
section, shifts the crossover point (where the NPN/PNP input
differential pairs transition from one to the other) closer to
either the positive supply rail or the negative supply rail. This
selectable crossover point allows the user to minimize
distortion based on the input signal and environment. The
default state is 1.2 V from the positive power supply, with the
SELECT pin left floating or in tri-state.
Table 6 shows the required voltages and modes of the
SELECT pin.
Table 6. SELECT Pin Mode Control
SELECT Pin Voltage (V)
V
S
= ±5 V
–5 to –4.2
–4.2 to –3.3
Mode
Disable
Crossover Referenced
–1.2 V to Positive Supply
Crossover Referenced
+1.2 V to Negative Supply
V
S
= +5 V
0 to 0.8
0.8 to 1.7
V
S
= +3 V
0 to 0.8
0.8 to 1.7
–3.3 to +5
1.7 to 5.0
1.7 to 3.0
When the input stage transitions from one input differential
pair to the other, there is virtually no noticeable change in the
output waveform.
The disable time of the AD8027/AD8028 amplifier is load
dependent. Typical data is presented in Table 7. See Figure 52
and Figure 53 for the actual switching measurements.
Table 7. DISABLE Switching Speeds
Supply Voltages
(R
L
= 1 k)
±5 V
t
ON
45 ns
t
OFF
980 ns
+5 V
50 ns
1100 ns
+3 V
50 ns
1150 ns
Driving a 16-Bit ADC
With the adjustable crossover distortion selection point and low
input signals into high resolution ADCs, such as the
AD7677,
a
16-Bit, 1 LSB INL, 1 MSPS
the typical schematic for driving the ADC.
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