DAC-HF8BMC Datasheet, PDF (1/4 Pages) Murata Power Solutions Inc. – Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters

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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 low-
capacitance substrate to assure high-speed performance.
The resistors are then functionally trimmed by laser for
optimum linearity.
DAC-HF Series
Ultra-Fast, 8/10/12-Bit
Digital-to-Analog Converters
INPUT/OUTPUT CONNECTIONS, DAC-HF12B
PIN FUNCTION
PIN FUNCTION
1 BIT 1 (MSB)
2 BIT 2
3 BIT 3
4 BIT 4
5 BIT 5
6 BIT 6
7 BIT 7
8 BIT 8
9 BIT 9 *
10 BIT 10 *
11 BIT 11 *
12 BIT 12 (LSB) *
* See note in Figure 1
24 +15V SUPPLY
23 GROUND
22 –15V SUPPLY
21 REFERENCEOUT
20 BIPOLAR OFFSET
19 10V RANGE
18 OUTPUT
17 20V RANGE
16 REFERENCEIN
15 GROUND
14 GROUND
13 GROUND
+15V SUPPLY –15V SUPPLY GROUNDS
24
22
13 14 15 23
–10V
REFERENCE
THIN-FILM R-2R
LADDER NETWORK
21
REFERENCE OUT
(–10.05V±0.05V)
4kW
20
BIPOLAR
OFFSET
2kW
2kW
17 20V RANGE
19 10V RANGE
18 OUTPUT
FAST PNP
CURRENT SWITCHES
REFERENCE
CONTROL
CIRCUIT
16 REFERENCE IN
PIN 1 2 3 4 5 6 7 8 9 10 11 12
BIT 1 2 3 4 5 6 7 8 9 10 11 12
** **
MSB
DIGITAL INPUTS
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