ad8260 Analog Devices, Inc., ad8260 Datasheet - Page 15

• Manufacturer Part Number: ad8260
• Description: High Current Driver Amplifier And Digital Vga/preamplifier With 3 Db Steps
• Manufacturer: Analog Devices, Inc.

Figure 46. Gain Response for the VGA/Preamplifier, Yellow: Gain Code Select,
Figure 45. Large-Signal Pulse Response for Various Values of Supply Voltage
Figure 47. Overdrive Recovery of the VGA/Preamplifier—Gain Code = 1011
M
1
4
CH1 1.00VΩ
MATH
–0.5
–1.0
–1.5
–1
–2
1.5
1.0
0.5
1
0
2
–200
Red: VGA Differential Output, Blue/Green: VGAP and VGAN
0
–3
V
S
100mV
–100
= +3V, +5V, AND ±5V
–2
T
CH2 20.0mVΩ
CH2 20.0mVΩ
–1
0
200nV
for the VGA/Preamplifier
0
100
1
200
M200ns
T
TIME (ns)
TIME (ns)
2
300
595.200ns
3
400
A CH1
4
500
5
600
760mV
6
700
7
MATH AMPL
CH1 AMPL
CH2 AMPL
1.20mV
117mV
3.28V
800
8
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Figure 49. Quiescent Supply Current vs. Temperature for Three Operating States
Figure 48. PSRR vs. Frequency for Dual Supplies for the High Current Driver
–10
–20
–30
–40
–50
–60
–70
Figure 50. Standby Quiescent Supply Current vs. Temperature
80
70
60
50
40
30
20
10
40
35
30
25
20
15
10
0
–55
–55
5
0
100k
V
GAIN CODE = 1011
S
–35
= ±3.3V
–35
+SUPPLY VGA/PREAMPLIFIER
+SUPPLY HIGH CURRENT DRIVER
–SUPPLY VGA PREAMPLIFIER
–SUPPLY HIGH CURRENT DRIVER
–15
–15
and the VGA/Preamplifier
5
5
TEMPERATURE (°C)
TEMPERATURE ( ° C)
FREQUENCY (Hz)
FULLY ENABLED
VGA/PREAMPLIFIER ENABLED
HIGH CURRENT DRIVER ENABLED
25
25
45
45
1M
65
65
85
85
105
105
AD8260
125
125
5M