MDSL-1250 Datasheet, PDF (7/8 Pages) Analog Devices – CURRENT AND VOLTAGE OUT

ANALOG OUTPUT
BIPOLAR, NONINVERTING
+FS,-lLSB
+1/2 FS
0
-1/2 FS
-FS
OFFSET BINARY
111
1
110
0
100
0
010
0
000
0
ANALOG OUTPUT
UNIPOLAR, NONINVERTING
+FS, -lLSB
+3/4 FS
+ 1/2 FS
+1/4 FS
0
Table 2. Input Coding
STRAIGHT
111
110
100
010
000
BINARY
1
.. 0
0
0
0
\
"B"
TRACE
2OMv/DIV
OJ!
\
0.1
~_.. 0.7
\
\
"A"
TRACE
2V/DIV
5ns - DIV
Figure 2.
- _{INTERNAL CURRENT DAC CHARACTERISTICS}
O_{' 1}
B^I
ROFFSET
I
OFFSET
S I
'OUTPUT
I
O _I
20
I
/ ^{L GROUND}
I
,-a'To 10
I
E L-I
J
.
CURRENT CONTROLLED
BY
{ ^{T INPUT DIGITAL CODE}
E Figure 3. Current Equivalent Circuit
§ 0.6
..I 0.5
"0.4
0.3
0.2
0,1
\
\
'\.
..........
10
15
20
2S
TIME.. ns
Figure 6. Accuracy vs. Time - MDS and MDSE
BASIC CONNECTIONS AND CALIBRATIONS
MDS/MDSE-o815.1020
DIGITAL
INPUTS
~~~B,J
BIT 2
12
.2.
1
I^I
DIA
I CONVERTER
19
BIT 9
10
BIT 10
ILSBI
r
,
I
ROFFSET
OffSET
I
I
Zo
OUTPUT
I
I
I
GROUND
L-
J
VOLTAGE CONTROLLED BY
DIGITAL INPUT CODE
Figure 4. Voltage Equivalent Circuit
Figure 7. Unipolar Output Current
\:'i~1
BIT 2
DIGITAL
INPUTS
[ BIT 9
BIT 13
ILSBI
2
I
I^I
DIA
I CONVERTER
i.!
10
WIl'H INPUT CODE OF
~ 1 12 OFFSET
200"
'000000000 ADJUST
POTENTIOMETER FOR
ZERO VOLTS OUTPUT
14
OUTPUT
".IV MAX
Rl
Figure 8. Bipolar Output Current
MDS-1240, MDSL-o825, 1035, 1250
1.5
>
I
~
i_>s
0.5
200 250 300 350 4("",; 3k
RL - 1!
2- 4-
Figure 5. VOUT vs. Load Resistance
MDS.0815, -1020
Page 7 of 8
1965 D/A CONVERTERS
"",-~;.;.~.._~
MSB
f T DIGITIAL
INPUTS
I
I
I
I
iI
BIT '2
lSB
29
28
DIA
130
CONVERTER
GROUND
300n
OUTPUT
OVTO"VFS
MDSL. ,oon
MDS.,240
GROUND
'B REF OUT
17
} 10011
TO
"1!
EXT
FS
ADJ
REF IN
31
32
-15V
-'5V
Tho '0011 POTENTIOMETER MAY BE OMITTED
IF ABSOLUTE ACCURACY OF FUll SCALE IS
NOT REOUIRED. IN THIS CASE PINS 17 AND
'8 SHOULD BE SHORTFD AND THE FULL SCALE
CURRENl' WilL BE SImA .5%. IMDS 1240.
'O.2mA '5%1
Figure 9. Unipolar Current Output
-~
~~