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DAC-HF Series
Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters
INNOVATION and EXCELLENCE
FEATURES
* * * * * * * 8, 10 and 12-Bit resolutions Settling times to 25ns 20ppm/C max. gain tempco Unipolar or bipolar operation Current output Internal feedback resistors High-reliability MIL-STD-883 models
GENERAL DESCRIPTION
The DAC-HF Series of hybrid DAC's are ultra high-speed, current output devices. They incorporate state-of-the-art performance in a miniature package, achieving maximum output settling times of 25ns for the 8 and 10-bit models and 50ns for the 12-bit model. They can be used to drive a resistor load directly for up to 1V output or a fast operational ampifier (such as DATEL's AM-500) for higher voltage outputs with sub-microsecond settling times. A tapped feedback resistor and a bipolar offset resistor are included internally to give five programmable output voltage ranges with an external operational amplifier. The DAC-HF design combines proven hybrid construction techniques with advanced circuit design to realize high-speed current switching. The design incorporates fast PNP current switches driving a low-impedance R-2R thin-film ladder network. The nichrome thin-film resistor network is deposited by electron beam evaporation on a lowcapacitance substrate to assure high-speed performance. The resistors are then functionally trimmed by laser for optimum linearity.
INPUT/OUTPUT CONNECTIONS, DAC-HF12B
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 +15V SUPPLY GROUND -15V SUPPLY REFERENCE OUT BIPOLAR OFFSET 10V RANGE OUTPUT 20V RANGE REFERENCE IN GROUND GROUND GROUND
* See note in Figure 1
+15V SUPPLY 24
-15V SUPPLY 22
GROUNDS 13 14 15 23
-10V REFERENCE 4kW
21
REFERENCE OUT (-10.05V0.05V) BIPOLAR OFFSET
20 2kW 2kW
THIN-FILM R-2R LADDER NETWORK
17 20V RANGE 19 10V RANGE 18 OUTPUT
FAST PNP CURRENT SWITCHES
REFERENCE CONTROL CIRCUIT
16 REFERENCE IN
PIN 1 BIT 1 MSB
234 234
8 9 10 11 12 8 9 10 11 12 **** LSB DIGITAL INPUTS
5 5
6 6
7 7
* FOR DAC-HF10B, PINS 11 & 12 ARE NO CONNECTION FOR DAC-HF8B, PINS 9, 10, 11 & 12 ARE NO CONNECTION
Figure 1. Functional Block Diagram
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DAC-HF Series
ABSOLUTE MAXIMUM RATINGS, ALL MODELS
Positive Supply, Pin 24 Negative Supply, Pin 22 Digital Input Voltage, Pins 1-12 Lead Temperature (soldering, 10s) +18V -18V +15V 300C
TECHNICAL NOTES
1. Proper operation of the DAC-HF Series converters is dependent on good board layout and connection practices. Bypass supplies as shown in the connection diagrams. Mount bypass capacitors close to the converter, directly to the supply pins where possible. 2. Use of a ground plane is particularly important in highspeed D/A converters as it reduces high-frequency noise and aids in decoupling the digital inputs from the analog output. Avoid ground loop problems by connecting all grounds on the board to the ground plane. The remainder of the ground plane should include as much of the circuit board as possible. 3. When the converter is configured for voltage output with an external operational amplifier, keep the leads from the converter to the output amplifier as short as possible. 4. The high-speed current switching technique used in the DAC-HF Series inherently reduces the amplitude and duration of large transient spikes at the output ("glitches"). The most severe glitches occur at half-scale, the major carry transition from 011 ... 1 to 100 ... 0 or vice versa. At this time, a skewing of the input codes can create a transition state code of 111 ... 1. The duration of the "transition state code" is dependent on the degree of skewing, but its effect is dependent on the speed of the DAC (an ultra-fast DAC will respond to these brief spurious inputs to a greater degree than a slow DAC). Minimize the effects of input skewing by using a highspeed input register to match input switching times. The input register recommended for use with the DAC-HF is easily implemented with two Texas Instruments SN74S174 hex D-type flip-flops. This register will reduce glitches to a very low level and ensure fast output settling times. 5. Test the DAC-HF using a low-capacitance test probe (such as a 10X probe). Take care to assure the shortest possible connection between probe ground and circuit ground. Long probe ground leads may pick up environmental E.M.I. causing artifacts on the scope display, i.e., signals that do not originate at the unit under test.
50mA 17mA
FUNCTIONAL SPECIFICATIONS
DESCRIPTION INPUTS Resolution, Bits Coding, Unipolar Output Coding, Bipolar Output Input Logic Level, Bit ON ("1") Input Logic Level, Bit OFF ("0") PERFORMANCE Nonlinearity Error, max. TMIN to TMAX Differential Nonlinearity Error, max. TMIN to TMAX Monotonicity Gain Tempco, max. Offset Tempco, Bipolar, max. Zero Tempco, max. Settling Time, ns max. Power Supply Sensitivity OUTPUTS Output Output Output Output Current Range, Unipolar Current Range, Bipolar Compliance Voltage Voltage Ranges
(Typical at +25C and 15V supplies unless otherwise noted.) 8B 10B 12B
8 10 12 Straight binary Offset binary +2.0V to +5.5V at +40A 0V to +0.8V at -2.6mA 0.012% 0.024% 0.012% 0.024% Guaranteed over oper. temp. range 20ppm/C 10ppm/C of FSR 1.5ppm/C of FSR 25 25 50 0.01%/% Supply 0 to +5mA 2.5mA 1.2V 0 to -5V 0 to -10V 2.5V 5V 10V 400 Ohms 10% 15pF 15nA 15V 0.5V 40mA 45mA 17mA 17mA
Output Resistance Output Capacitance Output Leakage Current, All Bits OFF POWER REQUIREMENTS Supply Voltages Positive Quiescent Current, max. Negative Quiescent Current, max. PHYSICAL ENVIRONMENTAL Operating Temperature Range, Case Storage Temperature Range Package Type Weight Footnotes
0C to +70C (BMC) -55C to +125C (BMM, 883) -65C to +150C 24-pin ceramic DDIP 0.22 ounces (6.3 grams)
6. Passive components used with the DAC-HF may be as indicated here: 0.1F and 1F bypass capacitors should be ceramic type and tantalum type respectively; the 400 output load is a 0.1%, 10ppm/C, metal-film type; adjustment potentiometers are ceremet types; other resistors may be 10% carbon composition types. 7. Output voltage compliance is 1.2V to preserve the linearity of the converter. In the bipolar mode, the DAC-HF can be operated with no load to give an output voltage of 1.0V. In the unipolar mode, the load resistance must be less than 600 to give less than +1.2V output. The specified output currents of 0 to +5mA and 2.5mA are measured into a short circuit or an operational amplifier summing junction.
With external operational amplifier. FSR is Full Scale Range, or the difference between minimum and maximum output values. Full-scale current change to 1LSB with 400 load.
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DAC-HF Series
CALIBRATION PROCEDURE
Unipolar Output Current 1. Connect the converter as shown in Figure 2. 2. Set all inputs low and adjust the ZERO ADJUST potentiometer for a reading of 0V at the output. 3. Set all inputs high and adjust the GAIN ADJUST potentiometer for a reading of -F.S. + 1LSB (See Table 1). Bipolar Output Current 1. Connect the converter as shown in Figure 3. 2. Set all inputs low and adjust the OFFSET ADJUST and LOAD potentiometer for an output reading of +F.S. (See Table 2). 3. Set all inputs high and adjust the GAIN ADJUST potentiometer for an output reading of -F.S. + 1LSB (See Table 2).
+15V + 0.1F 1F
Table 1. 12-Bit Unipolar Output Coding ANALOG OUTPUT UNIPOLAR INPUT CODING SCALE STRAIGHT BINARY 0 to 1V F.S. 0 to -5V F.S. 0 to -10V F.S.
-F.S. + 1LSB -3/4F.S. -1/2F.S. -1/4F.S. -1LSB 0 1111 1111 1111 1100 0000 0000 1000 0000 0000 0100 0000 0000 0000 0000 0001 0000 0000 0000 +0.9998V +0.7500V +0.5000V +2.5000V +0.0002V 0.0000V -4.9988V -3.7500V -2.5000V -1.2500V -0.0012V 0.0000V -9.9976V -7.5000V -5.0000V -2.5000V -0.0024V 0.0000V
Table 2. 12-Bit Bipolar Output Coding BIPOLAR SCALE
-F.S. + 1LSB -1/2F.S. -1LSB 0 +1/2F.S. +F.S. - 1LSB +F.S.
ANALOG OUTPUT INPUT CODING OFFSET 0.5V F.S. 2.5V F.S. 5V F.S. BINARY
1111 1111 1111 1100 0000 0000 1000 0000 0001 1000 0000 0000 0100 0000 0000 0000 0000 0001 0000 0000 0000 +0.4998V +0.1250V +0.0002V 0.0000V -0.1250V -0.4998V -0.5000V -2.4988V -1.2500V -0.0012V 0.0000V +1.2500V +2.4988V +2.5000V
10V F.S.
-9.9951V -5.0000V -0.0049V 0.0000V +5.0000V +9.9951V +10.0000V
-4.9976V -2.5000V -0.0024V 0.0000V +2.5000V +4.9976V +5.0000V
24 BIT 1 1 19 17 18 100W 200W 20 OFFSET ADJUST 370W 100W 16 15 14 12 BIT 12 23 22 13 LOAD (444W NOMINAL) (FOR 0 TO 0.5V FS) I OUT OUTPUT
Table 3. Programmable Output Range Pin Connections FEEDBACK OUTPUT VOLTAGE CONNECTIONS RANGE
0 to -5V 0 to -10V 2.5V 5V 10V PIN 19 PIN 19 PIN 19 PIN 19 PIN 17
CONNECT THESE PINS TOGETHER
PIN 17 to PIN 18 / PIN 20 to PIN 23 PIN 20 to PIN 23 PIN 17 to PIN 18 / PIN 20 to PIN 18 PIN 20 to PIN 18 PIN 20 to PIN 18
DAC-HF
21
GAIN ADJUST
In all programmable output ranges, pin 18 connects to external operational amplifier inverting input.
4k = 0.1% 20
BIPOLAR OFFSET REF OUT (-10V = 2%) 2k FEEDBACK (10V RANGE) 4k FEEDBACK (20V RANGE)
-15V 0.1F
+
21
1F
19
Figure 3. Bipolar Current Output Connections
+15V + 0.1F 1F +15V 24 BIT 1 1 19 17 18 I OUT 400W LOAD (FOR 0 TO +1V FS) 2MW ZERO ADJUST 25kW -15V OUTPUT
2k
2k 17
18 OUTPUT 400, 10% 5mA 23 GROUND
Figure 4. Equivalent Output Circuit
20
DAC-HF
21 100W 16 15 14
12 BIT 12 23 22
13
2V/DIV
-15V 0.1F
+
50nsec/DIV
2V/DIV
GAIN ADJUST
50nsec/DIV
1F
DAC-HF with AM-500, 5V output full scale (10V) step
Figure 2. Unipolar Current Output Connections
Figure 5. Voltage Output Waveforms
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DAC-HF Series
+15V 0 .1 F + 1F
APPLICATIONS
0 .1 F +
+15V 1F
24 B IT 1 1 19 17 18
* *
F E E D B A C K ; S e e p r o g r a m m a b le o u tp u t r a n g e c o n n e c tio n s , T a b le 3 .
B IT 1 1
24 19 17
* *
F E E D B A C K ; S e e p r o g r a m m a b le o u tp u t r a n g e c o n n e c tio n s , T a b le 3 .
4 A M -5 0 0 5 10 OUTPUT
18
2 A M -4 5 2 3 7 1 5 OFFSET A D JU S T 100 G A IN A D JU S T 20k 15V 6 OUTPUT
20
+15V 750k 100 G A IN A D JU S T R ZERO A D JU S T 20k9 15V R FEEDBACK x 400 R FEEDBACK + 400
12
20
D A C -H F
21
D A C -H F
21
16 15 14 12 B IT 1 2 23 22 13 R=
16 15 14 13 23 22 B IT 1 2
OUTPUT STEP
15V
TYPICAL SETTLING TIME TO 1LSB 300ns 200ns 150ns
OUTPUT STEP
15V
TYPICAL SETTLING TIME TO 1LSB 2s 600ns 400ns
0 .1 F
+
1F
20V 10V 5V
0 .1 F
+
1F
20V 10V 5V
Figure 6. Unipolar Ultra-Fast Voltage Output Circuit
Figure 7. Unipolar Fast Voltage Output Circuit
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
ORDERING INFORMATION
MODEL DAC-HF8BMC DAC-HF8BMM DAC-HF8/883 DAC-HF10BMC DAC-HF10BMM DAC-HF10/883 DAC-HF12BMC DAC-HF12BMM DAC-HF12/883 OPERATING TEMP. RANGE 0 to +70C -55 to +125C -55 to +125C 0 to +70C -55 to +125C -55 to +125C 0 to +70C -55 to +125C -55 to +125C BITS 8 8 8 10 10 10 12 12 12
24
13
0.100 TYP. (2.540) 1.100 (27.940) 0.235 MAX. (5.969) 0.200 MAX. (5.080)
0.010 -0.001 (0.254) 0.190 MAX. (4.826) 0.018 0.002 (0.457) 0.100 (2.540) 0.040 (1.016)
+0.002
SEATING PLANE 0.025 (0.635)
0.600 0.010 (15.240)
0.100 (2.540)
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C&D Technologies, Inc. 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.

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