AD8013A Просмотр технического описания (PDF) - Analog Devices
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AD8013A Datasheet PDF : 12 Pages
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AD8013
2:1 Video Multiplexer
Configuring two amplifiers as unity gain followers and using the
third to set the gain results in a high performance 2:1 mux
(Figures 39 and 40). This circuit takes advantage of the very low
crosstalk between Channels 2 and 3 to achieve the OFF channel
isolation shown in Figure 40. This circuit can achieve
differential gain and phase of 0.03% and 0.07° respectively.
VINA
VINB
13
2
14
12
2
DISABLE
10
3
8
9
3
DISABLE
R1
2kΩ
R3
10Ω
R4
10Ω
R2
2kΩ
5
1
6
R6
845Ω
7
R5
845Ω
VOUT
Figure 39. 2:1 Mux with High Isolation and Low
Differential Gain and Phase Errors
2
1
0
–1
–2
–3
–4
–5
–6
–7
–8
1M
GAIN
FEEDTHROUGH
10M
100M
FREQUENCY – Hz
–30
–40
–50
–60
–70
–80
1G
Figure 40. 2:1 Mux ON Channel Gain and Mux OFF Channel
Feedthrough vs. Frequency
Gain Switching
The AD8013 can be used to build a circuit for switching between
any two arbitrary gains while maintaining a constant input
impedance. The example of Figure 41 shows a circuit for switching
between a noninverting gain of 1 and an inverting gain of 1. The
total time for channel switching and output voltage settling is
about 80 ns.
698Ω 698Ω
+5V
2k
6
4
13
100Ω
VIN
12
50Ω
14
1k
5
17
DIS 1
15Ω
DIS 3
10
3
VOUT
1k
9
11 8
–5V
845Ω
845Ω
Figure 41. Circuit to Switch Between Gains of –1 and +1
500mV
100
90
500mV
200ns
10
0%
5V
Figure 42. Switching Characteristic for Circuit of Figure 41
14-Lead Plastic DIP (N-14)
0.795 (20.19)
0.725 (18.42)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
14-Lead SOIC (R-14)
0.3444 (8.75)
0.3367 (8.55)
14
1
PIN 1
0.210 (5.33)
MAX
0.160 (4.06)
0.115 (2.93)
0.022 (0.558)
0.014 (0.356)
8 0.280 (7.11)
7 0.240 (6.10)
0.060 (1.52)
0.015 (0.38)
0.325 (8.25)
0.300 (7.62) 0.195 (4.95)
0.115 (2.93)
0.100 0.070 (1.77)
(2.54) 0.045 (1.15)
BSC
0.130
(3.30)
MIN
SEATING
PLANE
0.015 (0.381)
0.008 (0.204)
14
0.1574 (4.00)
0.1497 (3.80) 1
8
0.2440 (6.20)
7 0.2284 (5.80)
0.0098 (0.25)
0.0040 (0.10)
PIN 1
0.0688 (1.75)
0.0532 (1.35)
0.0196
0.0099
(0.50)
(0.25)
x
45°
SEATING
PLANE
0.0500
(1.27)
BSC
0.0192 (0.49)
0.0138 (0.35)
8°
0.0098 (0.25) 0° 0.0500 (1.27)
0.0075 (0.19) 0.0160 (0.41)
–12–
REV. A
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