Datasheet

AD8260
Rev. A | Page 15 of 32
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
–3 –2 –1 0 1 2 3 4 5 6 7 8
TIME (ns)
OUTPUT VOLTAGE (V)
07192-045
V
S
= +3V, +5V, AND ±5V
Figure 45. Large-Signal Pulse Response for Various Values of Supply Voltage
for the VGA/Preamplifier
07192-046
CH1 1.00VΩ CH2 20.0mVΩ
MATH 100mV 200nV
CH2 20.0mVΩ
M200ns A CH1 760mV
1
M
4
T 595.200ns
CH1 AMPL
3.28V
CH2 AMPL
1.20mV
MATH AMPL
117mV
T
Figure 46. Gain Response for the VGA/Preamplifier, Yellow: Gain Code Select,
Red: VGA Differential Output, Blue/Green: VGAP and VGAN
0
1
OUTPUT VOLTAGE (V)
TIME (ns)
800700600
–1
–200 1000 300–100 200 500400
–2
2
07192-047
Figure 47. Overdrive Recovery of the VGA/Preamplifier—Gain Code = 1011
FREQUENCY (Hz)
PSRR (dB)
1M100k 5M
–10
–20
–30
–40
–50
–60
–70
–SUPPLY HIGH CURRENT DRIVER
+SUPPLY HIGH CURRENT DRIVER
+SUPPLY VGA/PREAMPLIFIER
–SUPPLY VGA PREAMPLIFIER
V
S
= ±3.3V
GAIN CODE = 1011
07192-048
Figure 48. PSRR vs. Frequency for Dual Supplies for the High Current Driver
and the VGA/Preamplifier
QUIESCENT SUPPLY CURRENT (mA)
0
40
30
–55
10
TEMPERATURE (°C)
5 25 45
20
65 85 105 125
–15–35
5
15
35
25
FULLY ENABLED
VGA/PREAMPLIFIER ENABLED
HIGH CURRENT DRIVER ENABLED
07192-049
Figure 49. Quiescent Supply Current vs. Temperature for Three Operating States
STANDBY QUIESCENT SUPPLY CURRENT (µA)
–55 –35 –15
TEMPERATURE (°C)
5 25 45 65 85 105 125
80
70
60
50
40
30
20
10
0
07192-050
Figure 50. Standby Quiescent Supply Current vs. Temperature