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DAC7551ZTDRNRQ1 Datenblatt(PDF) 11 Page - Texas Instruments |
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DAC7551ZTDRNRQ1 Datenblatt(HTML) 11 Page - Texas Instruments |
11 / 27 page 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 Submit Documentation Feedback 11 Product Folder Links: DAC7551-Q1 |
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