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
DAC349
SPECIFICATIO N S
SERIES
TY PE
DIGITA L INPUT
Resolution
Unipolar Coding
Bipolar Coding
Logic Levels
Binary
BCD
Input Current
A NA LOG OUTPUT
V oltage Range
Current Compliance
Impedance
Scale Factor
1
Unipolar Offset
1
Bipolar Offset
1
REFERENCE
Internal
2
External (D.C. only)
STA TIC PERFORM A NCE
Linearity
Differential Linearity
DY NA M IC PERFORM A NCE
Settling Time
Slew Rate
STA BILITY
A ccuracy vs Temp.
3
Linearity vs Temp.
Differential
Linearity vs Temp.
POW ER SUPPLY
V oltage @ Current
+15V @ 5mA (nom): 10mA (max)
+13V to +18V ;
–15V @ 15mA (nom): 20mA (max)
–13V to –18V ;
0.005% /%
375mW (max)
30ppm/ºC (max)
5ppm/ºC (max)
2ppm/ºC (max)
15µS (max)
1V /µs
±1/2 LSB (max)
±1 LSB (max)
-10V DC
-10V DC ±10% @1mA
0 to –5V , 0 to –10
±2.5V . ±5V , ±10V
±5mA (min)
0.1
±0.1% of F.S.R. (max)
±0.2% of F.S.R. (max)
±0.1% of F.S.R. (max)
12 Bits Binary (-12) or
3 Decades BCD (-3D)
Binary or BCD
Offset Binary
V
IH
=2.4V min,
V
IL
=0.8V max,
V
IH
=3.5V min,
V
IL
=1.5V max,
±1µA max
12
0.800
(20.320)
MAX
0.010
(0.254)
1
0.600
(15.24)
24
0.100
(0.25)
(Typical @+25ºC and nominal power supplies unless otherwise noted)
DA C349
Fixed Reference, V oltage Output
0.165
(4.191)
MAX
0.018
(0.451)
TY PICA L
DIM ENSIONS
inch
(mm)
PIN (1)
INDEX
TOP
V IEW
1.310
(33.274)
MAX
13
0.025
(0.635)
0.205
(5.207)
Pin 1 is marked by the dot on the top of the package
PIN
NO.
1
2
3
4
5
6
7
8
9
10
11
12
FUNCTION
NO.
OUTPUT
SUM M ING JCT
10V RA NGE
20 V OLT RA NGE
BIPOLA R OFFSET
GA IN A DJ
REF IN
REF OUT
– 15
+15V
GND
GND
PIN
24
23
22
21
20
19
18
17
16
15
14
13
FUNCTION
BINA RY
BIT 1 (M SB)
BIT 2
BIT 3
BIT 4
BIT 5
BIT 6
BIT 7
BIT 8
BIT 9
BIT 10
BIT 11
BIT 1 (LSB)
BCD
800
400
200
100
80
40
20
10
8
4
2
1
Rejection Ratio
Power Consumption
TEM PERA TURE RA NGE
Specified
DA C349C
DA C349B
Operating, A ll models
Storage, A ll models
M ECHA NICA L
Case Style
NOTES:
1. Offset and gain are externally adjustable. See A PPLICA TIONS
INFORM A TION.
2. For specified overall performance, external loading of the
reference output (Pin 8) must not exceed 1.0 mA .
3. Total effect of linearity, offset and gain tempco's on the transfer
characteristics of the unit.
4. In case of discrepancy between package shown in photograph
and package outline dimension, the mechanical outline is correct.
Specifications subject to change without notice.
ORDERING INFORM A TION
–25ºC
–55ºC
–55ºC
–65ºC
to
to
to
to
+85ºC
+125ºC
+125ºC
+150ºC
M ODEL
DA C349C-12
DA C349C-3D
DA C349B-12
DA C349B-3D
DESCRIPTION
Comm. 12-Bit, –25º C to +85º C
Comm, 3-Decade, –25ºC to +85ºC
M lL,12-Bit, –55ºC to +125ºC
M IL,3-Decade, –55ºC to +125ºC
Ceramic
Consult factory for application information.
CA UTION: ESD (Electro-Static Discharge) sensitive device.
Permanent damage may occur when unconnected devices are
subjected to high energy electrostatic fields. Unless otherwise
noted, the voltage at any digital input should never exceed the
supply voltage by more than 0.5 volts or go below –0.5 volts.
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