®
®
DAC-HF Series
Ultra-Fast, 8/10/12-Bit
Digital-to-Analog Converters
INNOVATION and EXCELLENCE
FEATURES
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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.
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
(–10.05V±0.05V)
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
2 3 4
2 3 4
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
MURATA-PS [ MURATA POWER SOLUTIONS INC. ]
