DAC349 Datasheet, PDF (1/2 Pages) API Technologies Corp – Low Power, 12-Bit CMOS DACs

Low Power, 12-Bit CMO S D ACs
DAC349
D ata Converter Line
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
GAIN ADJ
REF OUT
JUM PER
REF IN
GND GND +15V – 15V
12
11
10 10
6
- 10VDC
8
REF
BIPOLAR 20V
10V
SUM M ING
OFFSET RANGE RANGE JUNCTION
10
4
3
3
R1
R2
50k
50k
100k
–
+
7
PRECISION RESISTOR LADDER
AND SW ITCHES
* FOR BCD (-3D M ODELs),
R1 + R2 = 80k
1
OUTPUT
13 14 15 16 17 18 19 20 21 22 23 24
BINA RY
BIT 12 11 10 9 8 7 6 5 4 3 2 1 (- 12 M ODELS)
(LSB)
(M SB)
BCD
1 2 4 8 10 20 40 80 100 200 400 800 (- 3D M ODELS)
165Cedar Hill Street,Marlborough,MA01752 Tel:[phone] Fax: [phone]
www.SpectrumMicrowave.com