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DAC7551ZTDRNRQ1 Datenblatt(PDF) 11 Page - Texas Instruments

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Teilenummer DAC7551ZTDRNRQ1
Bauteilbeschribung  12-Bit, Ultra-Low Glitch, Voltage Output Digital-to-Analog Converter
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Hersteller  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

DAC7551ZTDRNRQ1 Datenblatt(HTML) 11 Page - Texas Instruments

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DAC
Register
REF(+)
Resistor String
REF( )
-
V
H
REF
V
OUT
50 kW
100 kW
100 kW
V
FB
V
L
REF
_
+
Interface
Logic
Shift
Register
DAC
Register
String
DAC
Power-Down
Logic
Power-On
Reset
V
DD
IOV
DD
V
H
REF
V
FB
V
OUT
V
L
REF
GND
CLR
SDO
SDIN
SYNC
SCLK
DAC7551-Q1
www.ti.com
SLAS767B – JUNE 2011 – REVISED MARCH 2015
7 Detailed Description
7.1 Overview
The DAC7551-Q1 device is a 12-bit resistor-string digital-to-analog converter (DAC). Unbuffered external
reference inputs allow for a positive voltage reference as low as 0.25 V and as high as VDD. An amplifier-
feedback input is available for better DC accuracy at the load point. The device is controlled over a 16-bit word
three-wire serial peripheral interface (SPI) up to 50 MHz with an option to daisy-chain multiple devices. An
asynchronous clear function along with power-down features allows for software controlled resets and low-power
consumption. A separate logic-supply input means the device can be used with different logic families across a
wide range of supply voltages.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Digital-to-Analog Converter
The architecture of the DAC7551-Q1 device consists of a string DAC followed by an output buffer amplifier.
Figure 26 shows a generalized block diagram of the DAC architecture.
Figure 26. Typical DAC Architecture
The input coding to the DAC7551-Q1 device is unsigned binary, which gives the ideal output voltage as show in
Equation 1.
VOUT = 2 × VREFL + (VREFH – VREFL) × D / 4096
where
D is the decimal equivalent of the binary code that is loaded to the DAC register, which ranges from 0 to 4095.
(1)
Copyright © 2011–2015, Texas Instruments Incorporated
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