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DAC-HK Series
High-Performance, 12-Bit DAC's with Input Registers
INNOVATION and EXCELLENCE
FEATURES
* * * * * * * 12-Bit resolution Integral nonlinearity error 1/2LSB, max. Differential nonlinearity error 3/4LSB, max. MIL-STD-883 high-reliability versions available Input register 3s fast settling time Guaranteed monotonicity over full temperature range
GENERAL DESCRIPTION
The DAC-HK Series hybrid D/A converters are highperformance 12-bit devices with a fast settling voltage output. They incorporate a level-controlled input storage register and are specifically designed for systems applications such as data bus interfacing with computers. When the "load" input is high, data in the storage register is held, and when the load input is low, data is transferred through to the DAC. There are two basic models available by coding option: binary and two's complement. The output voltage ranges are externally pinprogrammable and include: 0 to +5V, 0 to +10V, 2.5V, 5V and 10V. The DAC-HK Series contains a precision zener reference circuit. This eliminates code-dependent ground currents by routing current from the positive supply to the internal ground node as determined by the R-2R ladder network. The internal feedback resistors for the on-board amplifier track the ladder network resistors, enhancing temperature performance. The excellent tracking of the resistors results in a differential nonlinearity tempco of 2ppm/C maximum. The temperature coefficient of gain is 20ppm/C maximum, and the tempco of zero is 5ppm/C maximum.
INPUT/OUTPUT CONNECTIONS
PIN 1 2 3 4 5 6 7 8 9 10 11 12 FUNCTION BIT 1 (MSB) BIT 2 BIT 3 BIT 4 BIT 5 BIT 6 BIT 7 BIT 8 BIT 9 BIT 10 BIT 11 BIT 12 (LSB) PIN 24 23 22 21 20 19 18 17 16 15 14 13 FUNCTION REFERENCE OUT GAIN ADJUST +15V SUPPLY GROUND SUMMING JUNCTION 20V RANGE 10V RANGE BIPOLAR OFFSET LOAD VOLTAGE OUTPUT -15V SUPPLY +5V SUPPLY
REF. OUT 24
GAIN ADJUST 23
BIPOLAR OFFSET 17
+15V SUPPLY 22
-15V SUPPLY 14
+5V SUPPLY 13
19 20V RANGE 5k +5V 5k D/A CONVERTER 18 10V RANGE
LOAD 16
20
SUMMING JUNCTION
REGISTER 74LS75
REGISTER 74LS75
REGISTER 74LS75
15
VOLTAGE OUTPUT
21 GROUND
1234 BITS 1 2 3 4 MSB
5678 5678
9 10 11 12 9 10 11 12 LSB
DIGITAL INPUTS
Figure 1. Functional Block Diagram
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DAC-HK Series
ABSOLUTE MAXIMUM RATINGS
Positive Supply, Pin 22 Negative Supply, Pin 14 Logic Supply, Pin 13 Digital Input Voltage, Pins 1-12 & 16 Output Current, Pin 15 Lead Temperature (soldering, 10s) +18V -18V +5.25V +5.5V 20mA 300C
TECHNICAL NOTES
1. It is recommended that these converters be operated with local supply bypass capacitors of 1F (tantalum type) at the +15V, -15V and +5V supply pins. The capacitors should be connected as close to the pins as possible. In high RFI noise environments, these capacitors should be shunted with 0.01F ceramic capacitors. 2. The analog, digital and power grounds should be separated from each other as close as possible to pin 21 where they all must come together. 3. The "load" control pin is a level-triggered input which causes the register to hold data with a high input and transfer data to the DAC with a low input. 4. A setup time of 50ns minimum must be allowed for the input data. The DAC output voltage begins to change when the register output changes. 5. If the reference output terminal (pin 24) is used, an operational amplifier in non-inverting mode should be used as a buffer. Current drawn from pin 24 should be limited to 10A in order not to affect the T.C. of the reference
FUNCTIONAL SPECIFICATIONS
(Typical at +25C and 15V and +5V supplies unless otherwise noted.) INPUTS Resolution Coding, Unipolar Output Coding, Bipolar Output Input Logic Level, Bit ON ("1") Input Logic Level, Bit OFF ("0") Logic Loading Load Input Load Input Loading PERFORMANCE Nonlinearity Error, max. Differential Nonlinearity Error, max. Gain Error, Before Trimming Zero Error, Before Trimming Gain Tempco, max. Zero Tempco, Unipolar, max. Offset Tempco, Bipolar, max. Diff. Nonlinearity Tempco, max. Monotonicity Settling Time, 5V Change Settling Time, 10V Change Settling Time, 20V Change Settling Time, 1LSB Change Slew Rate Power Supply Rejection OUTPUTS Output Voltage Ranges, Unipolar Output Voltage Ranges, Bipolar 0 to +5V, 0 to +10V 2.5V 5V 10V 5mA min. 0.05 Ohm +15V, 0.5V at 15mA -15V, 0.5V at 30mA +5V, 0.25V at 65mA 1/2LSB 3/4LSB 0.1% 0.1% of FSR 20ppm/C 5ppm/C of FSR 10ppm/C of FSR 2ppm/C of FSR Guaranteed over temperature 3s 3s 4s 800ns 20V/s 0.002%FSR/% 12 bits Straight binary Offset binary, two's complement +2.0V to +5.5V 0V to +0.8V 1 LSTTL load High ("1") = hold data Low ("0") = transfer data 3 LSTTL loads
CALIBRATION PROCEDURE
Select the desired output voltage range and connect the converter as shown in the Output Range Selection Table and the Connection Diagrams. Refer to the Coding Tables.
Unipolar Operation
1. Zero Adjustment. Set the input digital code to 0000 0000 0000 and adjust the ZERO ADJ. potentiometer to give 0.0000V output. 2. Gain Adjustment. Set the input digital code to 1111 1111 1111 (straight binary) and adjust the GAIN ADJ. potentiometer to give the full-scale output voltage shown in Table 1.
Bipolar Operation
1. Offset Adjustment. Set the digital input code to 0000 0000 0000 (offset binary) or 1000 0000 0000 (two's complement) and adjust the OFFSET ADJ. potentiometer to give the negative full-scale output voltage shown in Table 2. 2. Gain Adjustment. Set the digital input code to 1111 1111 1111 (offset binary) or 0111 1111 1111 (two's complement) and adjust the GAIN ADJ. potentiometer to give the positive full-scale output voltage shown in Table 2.
Hold LOAD
Output Current Output Impedance POWER REQUIREMENTS Power Supply Voltages
PHYSICAL ENVIRONMENTAL Operating Temperature Range, Case Storage Temperature Range Package Type Weight Footnotes: For two's complement coding, order the "-2" model as described in Ordering Information. Logic levels are the same as for data inputs. Initial errors are trimmable to zero. See Connection Diagram. FSR is full scale range and is 10V for 0 to +10V output range, 20V for 10V output range, etc. By external pin connection. For 12V, +5V operation, contact factory. 0C to +70C (BGC, BMC) -55C to +125C (BMM, 883) -65C to +125C 24-pin DDIP 0.22 ounces (6.3 grams)
Transfer 1
DATA IN 0 REGISTER OUTPUT TO DAC
t SETUP 50nsec min.
t SETUP 50nsec min.
t PHL 60nsec ALL RISE AND FALL TIMES 10nsec
t PLH 60nsec
Figure 2. DAC-HK Timing
DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048-1194 (U.S.A.) Tel: 508-339-3000 Fax: 508-339-6356 * For immediate assistance 800-233-2765
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DAC-HK Series
20 SUMMING JUNCTION 5k FULL SCALE I OUT = 2mA I OUT 6.3k 17 BIPOLAR OFFSET 24 REFERENCE OUT 6.3V REF. 21 GROUND 5k 19 20V RANGE 18 10V RANGE 15 VOLTAGE OUTPUT
5k
Figure 3. Output Circuit
CONNECTION DIAGRAMS
LOAD BIT LSB 12 11 10 9 8 DATA IN 7 6 5 4 3 2 MSB 1 12 11 10 9 8 7 6 5 4 3 2 1 13 14 15 16 17 18 19 20 21 22 23 24
1F 0.01F 1F 1F
LOAD
+5V -15V OUT (O TO +10V)
BIT LSB 12 11 10 9 8 DATA IN 7 6 5 4 3
12 11 10 9 8 7 6 5 4 3 2 1
13 14 15 16 17 18 19 20 21 22 23 24
1F 0.01F 1F 1F
+5V -15V OUT (-5 TO +5V)
2.2M
100k ZERO ADJUST 100k GAIN ADJUST +15V
2.2M
100k ZERO ADJUST 100k GAIN ADJUST +15V
2.8M
2 MSB 1
2.8M
Figure 4. Unipolar Operation (0 to +10V)
Figure 5. Bipolar Operation (5V)
APPLICATIONS
DAC-HK12B DAC-HK12B LOAD 1 0 1 LSB's MSB's LSB's MSB's DAC-HK12B N LSB's MSB's
LOAD 0 DAC-HK12B 0
LOAD 1 DAC-HK12B 1
*********************
LOAD N DAC-HK12B N
LOAD 0
*******************
LOAD N
0
1
******
N TEMPORARY STORAGE REGISTER
0
1
******
N
ADDRESS DECODER
ADDRESS DECODER
DATA BUS 12 BITS
LOAD HI BYTE ADDRESS AN * * * * * A1 A0 WRITE STROBE
LOAD LO BYTE 8 BIT DATA BUS
ADDRESS
STROBE
Figure 6. Interfacing to 12-Bit Data Bus
Figure 7. Interfacing to 8-Bit Data Bus
Digital-to-Analog Converters
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DAC-HK Series
CODING TABLES
Table 1. Unipolar Operation STRAIGHT BINARY LSB 1111 0000 0000 0000 0000 0000 1111 0000 0000 0000 0001 0000 OUTPUT RANGES 0 TO +10V 0 TO +5V +9.9976 +7.5000 +5.0000 +2.5000 +0.0024 0.0000 +4.9988 +3.7500 +2.5000 +1.2500 +0.0012 0.0000
MSB
1111 1100 1000 0100 0000 0000
Table 2. Bipolar Operation OFFSET BINARY MSB 1111 1100 1000 0100 0000 0000 1111 0000 0000 0000 0000 0000 LSB 1111 0000 0000 0000 0001 0000 TWO'S COMPLEMENT MSB 0111 0100 0000 1100 1000 1000 1111 0000 0000 0000 0000 0000 LSB 1111 0000 0000 0000 0001 0000 10V +9.9951 +5.0000 0.0000 -5.0000 -9.9951 -10.0000 OUTPUT RANGES 5V +4.9976 +2.5000 0.0000 -2.5000 -4.9976 -5.0000 2.5V +2.4988 +1.2500 0.0000 -1.2500 -2.4988 -2.5000
Table 3. Output Range Selection RANGE 10V 5V 2.5V +10V +5V CONNECT THESE PINS TOGETHER 15 & 19 15 & 18 15 & 18 15 & 18 15 & 18 17 & 20 17 & 20 17 & 20 17 & 21 17 & 21 19 & 20 19 & 20
MECHANICAL DIMENSIONS INCHES (mm)
1.31 MAX. (33.27) Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) 0.010 (0.254) 3 place decimal (.XXX) 0.005 (0.127) 0.80 MAX. (20.32) 1 12 Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating
24
13
ORDERING INFORMATION
MODEL Binary Coding OPERATING TEMP. RANGE
0.100 TYP. (2.540) 1.100 (27.940) 0.235 MAX. (5.969) 0.200 MAX. (5.080)
DAC-HK12BGC 0 to +70C DAC-HK12BMC 0 to +70C DAC-HK12BMM -55 to +125C DAC-HKB/883 -55 to +125C Two's Complement Coding
+0.002 -0.001
0.010 (0.254) 0.190 MAX. (4.826) 0.018 0.002 (0.457) 0.100 (2.540) 0.040 (1.016)
SEATING PLANE 0.025 (0.635)
0.600 0.010 (15.240)
0.100 (2.540)
DAC-HK12BGC-2 DAC-HK12BMC-2 DAC-HK12BMM-2 DAC-HKB-2/883
0 to +70C 0 to +70C -55 to +125C -55 to +125C
The MIL-STD-883 units are available under DESC Drawing Number 5962-89528. Contact DATEL for 883 product specifications
DS-0053C 1996
DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356 Internet: www.datel.com Email: sales@datel.com
DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01 DATEL GmbH Munchen, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-6354-2025
DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark.

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