DAC349 APITECH | Alldatasheet

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Technical content

Low Power, 12-Bit CMO S DACs DAC349 Data 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

DESCRIPTION

The DAC349 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. All models include an internal precision reference and a gain-selectable output amplifier. The DAC349 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 DAC349B is specified over a temperature range of –55ºC to +125ºC. Both versions operate –55ºCto +125ºC. FUNCTIONAL DIAGRAM GND GND +15V – 15V BIPOLAR OFFSET 20V RANGE 10V RANGE SUM M ING JUNCTION * FOR BCD (-3D M ODELs), R1 + R2 = 80k GAIN ADJ REF OUT JUM PER REF IN 18 19 20 21 22 23 24 7 6 5 4 3 2 1 1 2 4 8 10 20 40 80 100 200 400 800 BINARY BIT BCD (- 12 M ODELS) (- 3D M ODELS) (M SB)(LSB) - 10VDC REF PRECISION RESISTOR LADDER AND SW ITCHES 50k 50k 100k OUTPUT 165Cedar Hill Street,Marlborough,MA01752 Tel:508.485.6350 Fax: 508.485.5168 www.SpectrumMicrowave.com

0.165 (4.191) M AX 0.600 (15.24) 0.010 (0.254) 0.100 (0.25)1.310 (33.274) M AX 0.025 (0.635) 0.205 (5.207) 0.800 (20.320) M AX 0.018 (0.451) PIN (1) INDEX TOP VIEW inch (mm) TY PICAL DIM ENSIONS 241 1312 Pin 1 is marked by the dot on the top of the package Consult factory for application information. SPECIFICATIO NS (Typical @+25ºC and nominal power supplies unless otherwise noted) SERIES DAC349 TY PE Fixed Reference, Voltage Output DIGITAL INPUT Resolution 12 Bits Binary (-12) or

3 Decades BCD (-3D)

Unipolar Coding Binary or BCD Bipolar Coding Offset Binary Logic Levels Binary VIH=2.4V min, VIL=0.8V max, BCD VIH=3.5V min, VIL=1.5V max, Input Current ±1µA max ANALOG OUTPUT Voltage Range 0 to –5V, 0 to –10 ±2.5V. ±5V, ±10V Current Compliance ±5mA (min) Impedance 0.1 Scale Factor1 ±0.1% of F.S.R. (max) Unipolar Offset1 ±0.2% of F.S.R. (max) Bipolar Offset1 ±0.1% of F.S.R. (max) REFERENCE Internal2 -10V DC External (D.C. only) -10V DC ±10% @1mA STATIC PERFORM ANCE Linearity ±1/2 LSB (max) Differential Linearity ±1 LSB (max) DY NAM IC PERFORM ANCE Settling Time 15µS (max) Slew Rate 1V/µs STABILITY Accuracy vs Temp.3 30ppm/ºC (max) Linearity vs Temp. 5ppm/ºC (max) Differential Linearity vs Temp. 2ppm/ºC (max) POW ER SUPPLY Voltage @ Current +15V @ 5mA (nom): 10mA (max) +13V to +18V; –15V @ 15mA (nom): 20mA (max) –13V to –18V; Rejection Ratio 0.005% /% Power Consumption 375mW (max) TEM PERATURE RANGE Specified DAC349C –25ºC to +85ºC DAC349B –55ºC to +125ºC Operating, All models –55ºC to +125ºC Storage, All models –65ºC to +150ºC M ECHANICAL Case Style Ceramic NOTES: 1. Offset and gain are externally adjustable. See APPLICATIONS INFORM ATION. 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. PIN FUNCTION PIN FUNCTION NO. NO. BINARY BCD

1 OUTPUT 24 BIT 1 (M SB) 800

2 SUM M ING JCT 23 BIT 2 400

4 20 VOLT RANGE 21 BIT 4 100

5 BIPOLAR OFFSET 20 BIT 5 80

6 GAIN ADJ 19 BIT 6 40

7 REF IN 18 BIT 7 20

8 REF OUT 17 BIT 8 10

9 – 15 16 BIT 9 8 10 +15V 15 BIT 10 4

11 GND 14 BIT 11 2

12 GND 13 BIT 1 (LSB) 1

DAC349C-12 Comm. 12-Bit, –25º C to +85º C DAC349C-3D Comm, 3-Decade, –25ºC to +85ºC DAC349B-12 M lL,12-Bit, –55ºC to +125ºC DAC349B-3D M IL,3-Decade, –55ºC to +125ºC CAUTION: 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. DAC349