AD9631-EB Analog Devices, AD9631-EB Datasheet - Page 16

• Manufacturer Part Number: AD9631-EB
• Description: Ultralow Distortion/ Wide Bandwidth Voltage Feedback Op Amps
• Manufacturer: Analog Devices

REV. A
A/D Converter Driver
As A/D converters move toward higher speeds with higher reso-
lutions, there becomes a need for high performance drivers that
will not degrade the analog signal to the converter. It is desir-
able from a system’s standpoint that the A/D be the element in
the signal chain that ultimately limits overall distortion. This
places new demands on the amplifiers used to drive fast, high
resolution A/Ds.
ANALOG IN
130
Figure 64. AD9631 Used as Driver for an AD872, a 12-Bit, 10 Msps A/D Converter
2
3
ANALOG
140
AD9631
–5V
+5V ANALOG
4
1
0.1 F
7
5
10 F
0.1 F
6
10 F
+5V ANALOG
0.1 F
0.1 F
1 F
26
27
28
4
5
1
2
–16–
0.1 F
AV
AGND
V
V
REF GND
REF OUT
REF IN
INA
INB
DD
AV
With high bandwidth, low distortion and fast settling time the
AD9631 and AD9632 make high performance A/D drivers for
advanced converters. Figure 64 is an example of an AD9631
used as an input driver for an AD872. A 12-bit, 10 Msps A/D
converter.
AD872
–5V ANALOG
SS
3
AV
DRGND
DRV
AGND
BIT10
BIT11
BIT12
DV
DGND
SS
MSB
OTR
BIT2
BIT3
BIT4
BIT5
BIT6
BIT7
BIT8
BIT9
25
CLK
0.1 F
DD
DD
19
18
6
22
23
21
20
17
16
15
14
13
12
7
11
10
9
8
24
+5V DIGITAL
0.1 F
0.1 F
10
+5V DIGITAL
AD9631/AD9632
DIGITAL OUTPUT
49.9
CLOCK INPUT