OUTPUT BITS
MSB
LSB
27 26 25 24 23 22 21 20 19 18 17 16
2
12/8
CS
NIBBLE A
NIBBLE B
NIBBLE C
3
4
5
6
CONTROL
LOGIC
A
THREE–STATE BUFFERS AND CONTROL
0
R/C
CE
12–BITS
28
1
OSCILLATOR
12–BIT SAR
STS
R1
100K
+5V
V
LOGIC
-15V
+15V
STROBE
12–BITS
1µF
DGND
10V
IN
0 TO 10V
13
15
SAMPLE/HOLD
MSB
CDAC
COMP
ANALOG
INPUTS
20V
IN 14
100K
100
LSB
BIP
OFF
0 TO 20V
12
V
OUT
REF
OFFSET/GAIN
TRIM NETWORK
REF
8
REF
AMP
R2
100
10
V
REF
IN
7
11
V
CC
1µF
+15V
9
AGND
NO CONNNECTION
PERMITTED
Figure 4. Unipolar Input Connections
and digital sections), and grounding. Digital
timing, calibration and the analog signal source
must be considered for correct operation.
on the component side is recommended. Keep
analog signal traces away from digital lines. It is
best to lay the PC board out such that there is an
analog section and a digital section with a single
pointgroundconnectionbetweenthetwothrough
an RF bead. If this is not possible, run analog
To achieve specified accuracy, a double–sided
printed circuit board with a copper ground plane
OUTPUT BITS
MSB
LSB
27 26 25 24 23 22 21 20 19 18 17 16
2
12/8
CS
NIBBLE A
NIBBLE B
NIBBLE C
3
4
5
6
CONTROL
LOGIC
A
THREE–STATE BUFFERS AND CONTROL
0
R/C
CE
12–BITS
28
1
OSCILLATOR
12–BIT SAR
STS
+5V
V
LOGIC
1µF
DGND
STROBE
12–BITS
10V
IN
±5V
13
15
SAMPLE/HOLD
CDAC
COMP
ANALOG
INPUTS
20V
IN 14
±10V
LSB
MSB
BIP
OFF
12
100
R1
V
OUT
REF
OFFSET/GAIN
TRIM NETWORK
REF
8
REF
AMP
100
R2
10
V
REF
IN
7
11
V
CC
1µF
+15V
9
NO CONNECTION
PERMITTED
AGND
Figure 5. Bipolar Input Connections
9
SPECTRUM [ SPECTRUM MICROWAVE, INC. ]
