D ata Converter Line
D AC349
Low Power, 12-Bit CMO S D ACs
FEATURES
•
•
•
•
12-bits binary or 3-decades BDC
Low power: 300mW
Commercial, industrial and M IL-STD-883 models
5 pin selectable output ranges
DESCRIP TION
The DA C349 Series are versatile, low power 12-bit D/A
converters that are intended for fixed reference
applications. These units combine a novel CM OS
switching technique with a precision, ultra-stable
thin-film ladder to achieve accurate conversion with
low power drain; improved reliability and near-
instantaneous warmup are major advantages of
reduced power consumption. A ll models include an
internal precision reference and a gain-selectable
output amplifier.
The DA C349 Series offers a choice of either 12-bit
binary coding (-12 models) or 3 decade BCD coding
(-3D models).
By external pin jumpering, the binary models can be
connected for unipolar output ranges of 0 to
–5V or 0 to –10V and for offset binary coded bipolar
outputs of ±2.5V , ±5V and ±10V . For ratiometric
applications, the units operate from an external fixed
DC reference of –10V ± 10% .
Both binary and BCD models are available in
commercial/industrial and M IL-STD-883 Rev. C, Level B
versions. The DA C349B is specified over a
temperature range of –55ºC to +125ºC. Both versions
operate –55ºCto +125ºC.
FUNCTIONAL DIAGRAM
GND
12
GND
11
+15V
10
– 15V
10
BIPOLA R
OFFSET
10
20V
RA NGE
4
R1
50k
GA IN A DJ
REF OUT
6
8
- 10V DC
REF
100k
10V
RA NGE
3
R2
50k
SUM M ING
JUNCTION
3
* FOR BCD (-3D M ODELs),
R1 + R2 = 80k
–
+
1
OUTPUT
JUM PER
REF IN
7
PRECISION RESISTOR LA DDER
A ND SW ITCHES
13
BINA RY
BCD
14
15
10
4
16
9
8
17
8
10
18
7
19
6
20 21
5
4
22
3
23
2
24
(- 12 M ODELS)
(- 3D M ODELS)
BIT 12 11
(LSB)
1
2
1
(M SB)
20 40
80 100 200 400 800
165Cedar Hill Street,Marlborough,MA01752 Tel:508.485.6350 Fax: 508.485.5168
www.SpectrumMicrowave.com