AD810 데이터 시트보기 (PDF) - Analog Devices
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AD810 Datasheet PDF : 16 Pages
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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. The 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 kΩ 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. The total
time for the output to go to zero will generally be about 250 ns
and is somewhat dependent on the load impedance.
OPERATION AS A VIDEO LINE DRIVER
The 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. The 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).
715Ω
715Ω
+VS
0.1µF
75Ω
CABLE
VIN
7
2
AD810
6
3
4 0.1µF
75Ω
–VS
75Ω
75Ω CABLE
VOUT
75Ω
Figure 47. A Video Line Driver Operating at a Gain of +2
PHASE
0
GAIN = +2
RL = 150Ω
–45
–90
1
–135
0
VS = ±15V
–180
GAIN
–1
–2
±5V
±2.5V
–225
–270
–3
VS = ±15V
±5V
–4
±2.5V
–5
1
10
100
1000
FREQUENCY – MHz
Figure 48. Closed-Loop Gain and Phase vs. Frequency,
G = +2, RL = 150, RF = 715 Ω
AD810
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0
5
0.20
GAIN = +2
RF = 715Ω
RL = 150Ω
fC = 3.58MHz
100 IRE
MODULATED RAMP
0.18
0.16
0.14
0.12
GAIN
PHASE
0.10
0.08
0.06
0.04
0.02
0
6 7 8 9 10 11 12 13 14 15
SUPPLY VOLTAGE – ± Volts
Figure 49. Differential Gain and Phase vs. Supply Voltage
+0.1
0
–0.1
RL = 150Ω
±2.5
±15V
±5V
+0.1
0
–0.1
RL= 1k
±2.5
±15V
±5V
100k
1M
10M
FREQUENCY – Hz
100M
Figure 50. Fine-Scale Gain (Normalized) vs. Frequency
for Various Supply Voltages, Gain = +2, RF = 715 Ω
110
100 G = +2
RL = 150Ω
90 VO = 250mV p-p
80
70
60
50
40
30
20
RF = 500
PEAKING ≤ 1.0dB
RF = 750
PEAKING ≤ 0.1dB
RF = 1k
2 4 6 8 10 12 14 16 18
SUPPLY VOLTAGE - ±Volts
Figure 51. –3 dB Bandwidth vs. Supply Voltage,
Gain = +2, RL = 150 Ω
REV. A
–13–
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