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DAC-HF8BMC Scheda tecnica(PDF) 1 Page - Murata Power Solutions Inc.

Il numero della parte DAC-HF8BMC
Spiegazioni elettronici  Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters
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Produttore elettronici  MURATA-PS [Murata Power Solutions Inc.]
Homepage  http://www.murata-ps.com
Logo MURATA-PS - Murata Power Solutions Inc.

DAC-HF8BMC Scheda tecnica(HTML) 1 Page - Murata Power Solutions Inc.

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PIN
FUNCTION
PIN
FUNCTION
1
BIT 1 (MSB)
24
+15V SUPPLY
2
BIT 2
23
GROUND
3
BIT 3
22
–15V SUPPLY
4
BIT 4
21
REFERENCEOUT
5
BIT 5
20
BIPOLAR OFFSET
6
BIT 6
19
10V RANGE
7
BIT 7
18
OUTPUT
8
BIT 8
17
20V RANGE
9
BIT 9 *
16
REFERENCEIN
10
BIT 10 *
15
GROUND
11
BIT 11 *
14
GROUND
12
BIT 12 (LSB) *
13
GROUND
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
DAC-HF Series
Ultra-Fast, 8/10/12-Bit
Digital-to-Analog Converters
Figure 1. Functional Block Diagram
* See note in Figure 1
INPUT/OUTPUT CONNECTIONS, DAC-HF12B
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.
REFERENCE
CONTROL
CIRCUIT
23
–15V SUPPLY
22
+15V SUPPLY
24
15
14
13
GROUNDS
16
2k
W
2k
W
4k
W
18
19
17
20
BIPOLAR
OFFSET
BIT
12
*
11
*
10
*
9
*
8
7
6
5
4
3
2
1
MSB
FAST PNP
CURRENT SWITCHES
FOR DAC-HF10B, PINS 11 & 12 ARE NO CONNECTION
FOR DAC-HF8B, PINS 9, 10, 11 & 12 ARE NO CONNECTION
*
21
REFERENCE OUT
(–10.05V±0.05V)
–10V
REFERENCE
THIN-FILM R-2R
LADDER NETWORK
DIGITAL INPUTS
LSB
PIN
20V RANGE
10V RANGE
OUTPUT
REFERENCE IN
12
11
10
9
8
7
6
5
4
3
2
1


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