ad8260 Analog Devices, Inc., ad8260 Datasheet - Page 11

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

Figure 21. Large-Signal Pulse Response of the High Current Driver for Various
Figure 23. Gain Step vs. Gain Select Code for Three Samples for the
Values of Load Capacitance, C
–0.5
–1.0
–1.5
–2.0
4.00
3.75
3.50
3.25
3.00
2.75
2.50
2.25
2.00
Figure 22. Gain vs. Gain Select Code for Three Samples for the
2.0
1.5
1.0
0.5
27
24
21
18
15
12
–3
–6
–9
0
–30
9
6
3
0
VGA/Preamplifier at Three Frequencies—See Figure 57
VGA/Preamplifier at Three Frequencies—See Figure 57
R
NONINVERTING
0001
0010
AVERAGE OF 3 SAMPLES
f = 1MHz, 10MHz, AND 40MHz
LOAD
–20
f = 1MHz, 10MHz, AND 40MHz
0010
0011
= 50Ω
AVERAGE OF 3 SAMPLES
–10
0011
0100
0
0100
0101
GAIN SELECT CODE
GAIN SELECT CODE
10
0101
0110
TIME (ns)
LOAD
20
0110
, and 50 Ω Load—See Figure 56
0111
30
0111
40
1000
1000
50
1001
C
C
C
1001
LOAD
LOAD
LOAD
60
1010
1010
= 5pF
= 10pF
= 47pF
70
1011
1011
80
Rev. 0 | Page 11 of 32
Figure 24. Absolute Gain Error vs. Gain Select Code for Three Samples for the
VGA/Preamplifier at Three Frequencies Normalized to 1 MHz and Code 0110
Figure 26. Output Offset Voltage vs. Gain Select Code at Three Temperatures
Figure 25. Gain Error vs. Gain Select Code at Three Temperatures for the
–0.25
–0.50
–0.75
–1.00
–0.25
–0.50
–0.75
–1.00
1.00
0.75
0.50
0.25
1.00
0.75
0.50
0.25
–10
–20
–30
–40
–50
50
40
30
20
10
0
0
0
0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011
0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011
0001
AVERAGE OF 3 SAMPLES
f = 1MHz, 10MHz, AND 40MHz
AVERAGE OF 3 SAMPLES AT
EACH TEMPERATURE
AVERAGE OF 3 SAMPLES AT
EACH TEMPERATURE
0010
for the VGA/Preamplifier—See Figure 58
T = +105°C
T = +25°C
T = –40°C
T = +105°C
T = +25°C
T = –40°C
VGA/Preamplifier—See Figure 57
0011
0100
GAIN SELECT CODE
GAIN SELECT CODE
GAIN SELECT CODE
See Figure 57
0101
0110
0111
1000
1001
1010
AD8260
1011