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AD568 Datasheet(PDF) 11 Page - Analog Devices

Part No. AD568
Description  12-Bit Ultrahigh Speed Monolithic D/A Converter
Download  14 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD568 Datasheet(HTML) 11 Page - Analog Devices

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AD568
REV. A
–11–
5V
DIGITAL GROUND
PLANE
CLOCK
ANALOG GROUND
PLANE
+15V
–15V
OUTPUT
5V
INPUT
WORDS
AD568
SETTLING/GLITCH
EVALUATION BOARD
Component Side
ANALOG +5V
+5V
ANALOG VCC
ANALOG VEE
Foil Side
Figure 18. Printed Circuit Board Layout
High-Speed Interconnect and Routing
It is essential that care be taken in the signal and power ground
circuits to avoid inducing extraneous voltage drops in the signal
ground paths. It is suggested that all connections be short and
direct, and as physically close to the package as possible, so that
the length of any conduction path shared by external compo-
nents will be minimized. When runs exceed an inch or so in
length, some type of termination resistor may be required. The
necessity and value of this resistor will be dependent upon the
logic family used.
For maximum ac performance, the DAC should be mounted di-
rectly to the circuit board; sockets should not be used as they in-
troduce unwanted capacitive coupling between adjacent pins of
the device.
Applications
1
s, 12-BIT SUCCESSIVE APPROXIMATION A/D
CONVERTER
The AD568’s unique combination of high speed and true 12-bit
accuracy can be used to construct a 12-bit SAR-type A/D con-
verter with a sub-
µs conversion time. Figure 19 shows the con-
figuration used for this application. A negative analog input
voltage is converted into current and brought into a summing
junction with the DAC current. This summing junction is
bidirectionally clamped with two Schottky diodes to limit its
voltage excursion from ground. This voltage is differentially am-
plified and passed to a high-speed comparator. The comparator
output is latched and fed back to the successive approximation
register, which is then clocked to generated the next set of codes
for the DAC.
13
16
15
14
24
23
22
21
20
19
18
17
+15V
REFCOM
–15V
IBPO
RL
ACOM
LCOM
SPAN
SPAN
THCOM
VTH
IOUT
12
11
10
9
8
1
2
3
4
7
6
5
DAC
AD568
0.2µF
0.1µF
0.1µF
0.1µF
–15V
+15V
ANALOG
GND PLANE
100pF
1k
+5V
NC
NC
4
7
6
5
21
20
19
18
17
16
9
8
Q11
Q10
Q9
Q8
Q6
Q5
Q4
Q3
Q2
Q1
Q0
Q7
11
3
14
1
13
24
12
2
23
22
15
10
VCC
GND
D0
Q
11
NC
NC
CP
E
S
CC
D
NC
+5V
PARALLEL DATA
OUT
SAR
2504
0.01µF
1k
620
620
2.5k
VI
0 TO –10.24V
N
+5V
–5V
–5V
1k
150
Q1
Q2
Q3
D1
D2
27k
–15V
1
2
3
4
8
7
6
5
V+
+IN
V–
–IN
OUT
OUT
LCH
GND
COMPARATOR
LT1016
D3
IN4148
CONVERSION COMPLETE
START COMVERT
CHIP ENABLE
150k
+5V
INVERTER
74HC04
15k
150k
Q4
Q5
Figure 19. AD568 1
µs Successive Approximation A/D Application


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