DAC8563SDGST datasheet(29/63 Pages) TI2

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REFIN

REFOUT

REF

DIVIDER

ToOutput Amplifier

DAC7562, DAC7563, DAC8162

DAC8163, DAC8562, DAC8563

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SLAS719E – AUGUST 2010 – REVISED JUNE 2015

Feature Description (continued)

8.3.1.1 Resistor String

The resistor string section is shown in Figure 89. It is simply a string of resistors, each of value R. The code

loaded into the DAC register determines at which node on the string the voltage is tapped off to be fed into the

output amplifier by closing one of the switches connecting the string to the amplifier. The resistor string

architecture results in monotonicity. The RDIVIDER switch is controlled by the gain registers (see the Gain Function

section). Because the output amplifier has a gain of 2, RDIVIDER is not shorted when the DAC-n gain is set to 1

(default if internal reference is disabled), and is shorted when the DAC-n gain is set to 2 (default if internal

reference is enabled).

Figure 89. Resistor String

8.3.1.2 Output Amplifier

The output buffer amplifier is capable of generating rail-to-rail voltages on its output, giving a maximum output

range of 0 V to AVDD. It is capable of driving a load of 2 kΩ in parallel with 3 nF to GND. The typical slew rate is

0.75 V/µs, with a typical full-scale settling time of 14 µs as shown in Figure 31, Figure 32, Figure 75 and

Figure 76.

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DAC8563SDGST 数据表(PDF) 29 Page - Texas Instruments