dac-hf C&D Technologies., dac-hf Datasheet

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dac-hf

Manufacturer Part Number
dac-hf
Description
Ultra-fast, 8/10/12-bit Digital-to-analog Converters
Manufacturer
C&D Technologies.
Datasheet

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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 low-
capacitance substrate to assure high-speed performance.
The resistors are then functionally trimmed by laser for
optimum linearity.
®
INNOVATION and EX C ELL E N C E
PIN
BIT
+15V SUPPLY
MSB
1
1
24
2
2
3
3
CURRENT SWITCHES
LADDER NETWORK
4
4
DIGITAL INPUTS
THIN-FILM R-2R
FAST PNP
5
5
–15V SUPPLY
6
6
7
7
®
22
8
8
REFERENCE
9
9
*
Figure 1. Functional Block Diagram
10
10
–10V
*
13
GROUNDS
11
11
*
14
LSB
12
12
*
15
23
REFERENCE
CONTROL
CIRCUIT
2kW
*
FOR DAC-HF8B, PINS 9, 10, 11 & 12 ARE NO CONNECTION
FOR DAC-HF10B, PINS 11 & 12 ARE NO CONNECTION
4kW
2kW
* See note in Figure 1
PIN
10
12
11
1
2
3
4
5
6
7
8
9
INPUT/OUTPUT CONNECTIONS, DAC-HF12B
21
20
17
19
18
16
Digital-to-Analog Converters
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) *
REFERENCE OUT
(–10.05V±0.05V)
BIPOLAR
OFFSET
20V RANGE
10V RANGE
OUTPUT
REFERENCE IN
Ultra-Fast, 8/10/12-Bit
DAC-HF Series
PIN
24
23
22
21
20
19
18
17
16
15
14
13
FUNCTION
GROUND
–15V SUPPLY
REFERENCE OUT
BIPOLAR OFFSET
10V RANGE
OUTPUT
20V RANGE
REFERENCE IN
GROUND
GROUND
GROUND
+15V SUPPLY

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dac-hf Summary of contents

Page 1

... LSB 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 DAC-HF Series Ultra-Fast, 8/10/12-Bit PIN FUNCTION 24 +15V SUPPLY 23 GROUND 22 –15V SUPPLY 21 REFERENCE OUT 20 BIPOLAR OFFSET 19 10V RANGE 18 ...

Page 2

... 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. 6. Passive components used with the DAC-HF may be as 45mA 50mA indicated here: 0.1μF and 1μF bypass capacitors should 17mA 17mA be ceramic type and tantalum type respectively ...

Page 3

... RANGE) 18 OUTPUT 400Ω, ±10% 5mA 23 GROUND Figure 4. Equivalent Output Circuit 50nsec/DIV 50nsec/DIV DAC-HF with AM-500, ±5V output full scale (10V) step Figure 5. Voltage Output Waveforms 0 to –10V F.S. –9.9976V –7.5000V –5.0000V –2.5000V –0.0024V 0.0000V ±10V F.S. ...

Page 4

... DAC-HF Series Ω OUTPUT Figure 6. Unipolar Ultra-Fast Voltage Output Circuit MECHANICAL DIMENSIONS INCHES (mm) 1.31 MAX. (33.27 0.100 TYP. (2.540) 1.100 (27.940) 0.235 MAX. (5.969) 0.190 MAX. 0.100 (4.826) (2.540) 0.040 0.018 ±0.002 (1.016) (0.457) ® ® C&D Technologies, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ...

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