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AD9048 Arkusz danych(PDF) 7 Page - Analog Devices

Numer części AD9048
Szczegółowy opis  Monolithic 8-Bit Video A/D Converter
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD9048 Arkusz danych(HTML) 7 Page - Analog Devices

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AD9048
–7–
REV. F
LAYOUT SUGGESTIONS
Designs that use the AD9048 or any other high speed device
must follow some basic layout rules to ensure optimum
performance.
The first requirement is to have a large, low impedance ground
plane under and around the converter. If the system uses separate
analog and digital grounds, both should be solidly connected
together, and to the ground plane, as closely to the AD9048 as
practical to avoid ground loop currents.
Ceramic 0.1
µF decoupling capacitors should be placed as closely
as possible to the supply pins of the AD9048. For decoupling
low frequency signals, use 10
µF tantalum capacitors also con-
nected as closely as practical to voltage supply pins.
Within the AD9048, reference currents may vary because of
coupling between the clock and input signals. As a result, it is
important that the ends of the reference ladder, RT (Pin 18) and
RB (Pin 26), be connected to low impedances (as measured
from ground).
If the AD9048 is being used in a circuit in which the reference
is not varied, a bypass capacitor to ground is strongly recom-
mended. In applications that use varying references, they must
be driven from a low impedance source.
0.1 F
VEE
VCC
+5.0V
–5.2V
VIN
RT
RB
CONVERT
43
AD9048
R
R
50
1k
100
2N3906
AD741
5
1k
0.1 F
0.1 F
2k
27
0.1 F
–5.2V
0.1 F
ANALOG
INPUT
(0V TO 2V)
TTL
CONVERT
SIGNAL
D1 (MSB)
D8 (LSB)
10k
AD589
AD9617/AD9618,
AD9620/AD9630,
AD847
Figure 7. Typical Connections
Table I. Truth Table
Offset Twos
Binary
Complement
Step
Range
True
Inverted
True
Inverted
–2.000 V FS
–2.0480 V FS
NMINV = 1
0
0
1
7.8431 mV Step
8.000 mV Step
NLINV = 1
0
1
0
000
0.0000 V
0.0000 V
00000000
11111111
10000000
01111111
001
–0.0078 V
–0.0080 V
00000001
11111110
10000001
01111110
••
••
••
127
–0.9961 V
–1.0160 V
01111111
10000000
11111111
00000000
128
–1.0039 V
–1.0240 V
10000000
01111111
00000000
11111111
129
–1.0118 V
–1.0320 V
10000001
01111110
00000001
11111110
••
••
••
254
–1.9921 V
–2.0320 V
11111110
00000001
01111110
10000001
255
–2.0000 V
–2.0400 V
11111111
00000000
01111111
10000000


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