DAC8550_16 Datasheet, PDF (15/31 Pages) Texas Instruments – 16-bit, Ultra-Low Glitch, Voltage Output Digital-To-Analog Converter

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7 Detailed Description
DAC8550
SLAS476F – MARCH 2006 – REVISED MARCH 2016
7.1 Overview
The DAC8550 is a small, low-power, voltage output, single-channel, 16-bit DAC. The device is monotonic by
design, provides excellent linearity, and minimizes undesired code-to-code transient voltages. The DAC8550
uses a versatile, three-wire serial interface that operates at clock rates of up to 30 MHz and is compatible with
standard SPI, QSPI, Microwire, and digital signal processor (DSP) interfaces.
7.2 Functional Block Diagram
V_DD
V_FB
V_REF
REF (+)
16-Bit DAC
V_OUT
16
DAC Register
SYNC
SCLK
D_IN
16
Shift Register
PWB
Control
Resistor
Network
GND
7.3 Feature Description
7.3.1 DAC Section
The architecture of the DAC8850 consists of a string DAC followed by an output buffer amplifier. Figure 46
shows the block diagram of the DAC architecture.
V_REF
50kW
50kW
V_FB
62kW
DAC
Register
REF(+)
Resistor String
REF(-)
V_OUT
GND
Figure 46. DAC8550 Architecture
The input coding to the DAC8550 is 2's complement, so the ideal output voltage is given by Equation 1.
V_O
=
V_REF
2
+
V_REF ´ D
65536
where
• D = decimal equivalent of the 2's complement code that is loaded to the DAC register
(1)
In Equation 1, D ranges from –32768 to 32767 where D = 0 is centered at V_REF / 2.
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