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參數(shù)資料
| 型號： | AD810 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Low Power Video Op Amp with Disable(帶禁用的低功耗視頻運放) |
| 中文描述： | 低功耗視頻運算放大器具有禁用（帶禁用的低功耗視頻運放） |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 521K |
| 代理商： | AD810 |
AD810
REV. A
–13–
of the disable the disable pin for
±
5 V supplies. If driven by
complementary output CMOS logic (such as the 74HC04), the
disable time (until the output goes high impedance) is about
100 ns and the enable time (to low impedance output) is about
170 ns on
±
5 V supplies. T he enable time can be extended to
about 750 ns by using open drain logic such as the 74HC05.
When operated on
±
15 V supplies, the AD810 disable pin may
be driven by open drain logic such as the 74C906. In this case,
adding a 10 k
pull-up resistor from the disable pin to the plus
supply will decrease the enable time to about 150 ns. If there is
a nonzero voltage present on the amplifier's output at the time it
is switched to the disabled state, some additional decay time will
be required for the output voltage to relax to zero. T he total
time for the output to go to zero will generally be about 250 ns
and is somewhat dependent on the load impedance.
OPE RAT ION AS A VIDE O LINE DRIVE R
T he AD810 is designed to offer outstanding performance at
closed-loop gains of one or greater. At a gain of 2, the AD810
makes an excellent video line driver. T he low differential gain
and phase errors and wide –0.1 dB bandwidth are nearly
independent of supply voltage and load (as seen in Figures 49
and 50).
AD810
75
7
3
2
0.1μF
+V
S
6
–V
S
4
0.1μF
V
IN
V
OUT
715
75
CABLE
75
75
75
CABLE
715
Figure 47. A Video Line Driver Operating at a Gain of +2
GAIN = +2
R
L
= 150
±2.5V
V
S
= ±15V
±5V
±2.5V
PHASE
GAIN
0
–5
10
100
–1
–2
–3
–4
1
1
1000
0
–45
–90
–135
–180
–225
–270
C
P
FREQUENCY – MHz
±5V
V
S
= ±15V
Figure 48. Closed-Loop Gain and Phase vs. Frequency,
G = +2, R
L
= 150, R
F
= 715
0.10
0
15
0.03
0.01
6
0.02
5
0.06
0.04
0.05
0.07
0.08
0.09
14
13
12
11
10
9
8
SUPPLY VOLTAGE – ± Volts
7
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
GAIN
PHASE
GAIN = +2
R
F
= 715
R
L
= 150
f
= 3.58MHz
100 IRE
MODULATED RAMP
D
D
Figure 49. Differential Gain and Phase vs. Supply Voltage
100k
1M
100M
10M
+0.1
0
–0.1
–0.1
0
+0.1
N
FREQUENCY – Hz
R
L
= 150
R
L
= 1k
±15V
±5V
±15V
±5V
±2.5
±2.5
Figure 50. Fine-Scale Gain (Normalized) vs. Frequency
for Various Supply Voltages, Gain = +2, R
F
= 715
110
40
20
2
30
70
50
60
80
90
100
18
16
14
12
10
8
6
SUPPLY VOLTAGE - ±Volts
4
–
PEAKING 1.0dB
PEAKING 0.1dB
G = +2
R
L
= 150
V
O
= 250mV p-p
R
F
= 500
R
F
= 750
R
F
= 1k
Figure 51. –3 dB Bandwidth vs. Supply Voltage,
Gain = +2, R
L
= 150
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