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DAC8162-Q1 数据表(PDF) 26 Page - Texas Instruments |
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DAC8162-Q1 数据表(HTML) 26 Page - Texas Instruments |
26 / 54 page IN O UT REF n D V = V Gain 2 æ ö ´ ´ ç ÷ è ø DAC Gain Register Register REF(+) Resistor String REF( ) - GND V / V REFIN REFOUT V OUT 150 kW 150 kW D IN n DAC756x-Q1 (12-Bit) DAC816x-Q1 (14-Bit) DAC856x-Q1 (16-Bit) Data Buffer A DAC Register A Buffer Control Register Control Control Logic Power- Down Control Logic AV DD V REFIN REFOUT / V CLR LDAC 2.5-V Reference Data Buffer B DAC Register B V B OUT V A OUT GND DAC DAC Input Control Logic SYNC SCLK D IN DAC7562-Q1, DAC7563-Q1 DAC8162-Q1, DAC8163-Q1 DAC8562-Q1, DAC8563-Q1 SLAS950A – MAY 2013 – REVISED JUNE 2015 www.ti.com 8 Detailed Description 8.1 Overview The DAC756x-Q1, DAC816x-Q1, and DAC856x-Q1 devices are low-power, voltage-output, dual-channel, 12-, 14-, and 16-bit digital-to-analog converters (DACs), respectively. These devices include a 2.5-V, 4-ppm/°C internal reference, giving a full-scale output voltage range of 2.5 V or 5 V. The internal reference has an initial accuracy of ±5 mV and can source or sink up to 20 mA at the VREFIN/VREFOUT pin. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Digital-to-Analog Converter (DAC) The DAC756x-Q1, DAC816x-Q1, and DAC856x-Q1 architecture consists of two string DACs, each followed by an output buffer amplifier. The devices include an internal 2.5-V reference with 4-ppm/°C temperature drift performance. Figure 88 shows a principal block diagram of the DAC architecture. Figure 88. DAC Architecture The input coding to the DAC756x-Q1, DAC816x-Q1, and DAC856x-Q1 devices is straight binary, so the ideal output voltage is given by Equation 1: (1) where: n = resolution in bits; either 12 (DAC756x-Q1), 14 (DAC816x-Q1) or 16 (DAC856x-Q1) DIN = decimal equivalent of the binary code that is loaded to the DAC register. DIN ranges from 0 to 2 n – 1. VREF = DAC reference voltage; either VREFOUT from the internal 2.5-V reference or VREFIN from an aaa external reference. Gain = 1 by default when internal reference is disabled (using external reference), and gain = 2 by default aaa when using internal reference. Gain can also be manually set to either 1 or 2 using the gain register. aaa See the Gain Function section for more information. 26 Submit Documentation Feedback Copyright © 2013–2015, Texas Instruments Incorporated Product Folder Links: DAC7562-Q1 DAC7563-Q1 DAC8162-Q1 DAC8163-Q1 DAC8562-Q1 DAC8563-Q1 |
类似零件编号 - DAC8162-Q1 |
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类似说明 - DAC8162-Q1 |
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