DAC8551-Q1 Datasheet, PDF (12/28 Pages) Texas Instruments – Automotive 16-Bit, Ultralow-Glitch, Voltage-Output DAC

DAC8551-Q1
SLASEB8A – FEBRUARY 2016 – REVISED MARCH 2016
7 Detailed Description
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7.1 Overview
The DAC8551-Q1 is a small, low-power, voltage-output, 16-bit digital-to-analog converters (DACs) qualified for
automotive applications. The DAC8551-Q1 provides good linearity, and minimizes undesired code-to-code
transient voltages. The DAC8551-Q1 devices use a versatile 3-wire serial interface that operates at clock rates to
30 MHz and is compatible with standard SPI, QSPI, Microwire, and digital signal processor (DSP) interfaces.
The DAC8551-Q1 requires an external reference voltage to set its output range. The DAC8551-Q1 incorporates
a power-on-reset circuit that ensures the DAC output powers up at 0 V and remains there until a valid write to the
device takes place. The DAC8551-Q1 contain a power-down feature, accessed over the serial interface, that
reduces the current consumption of the device to 800 nA at 5 V.
The DAC8551-Q1 power consumption is only 800 µW at 5 V, reducing to less than 4 μW in power-down mode.
The DAC8551-Q1 is available in a VSSOP-8 package.
7.2 Functional Block Diagram
V_REF
V_DD
SYNC
SCLK
D_IN
Ref (+)
16-Bit DAC
16
DAC Register
16
Shift Register
PWD Control
V_FB
V_OUT
GND
Resistor
Network
7.3 Feature Description
7.3.1 DAC Section
The DAC8551-Q1 architecture consists of a string DAC followed by an output buffer amplifier. Figure 27 shows a
block diagram of the DAC architecture.
V_REF
62kW
50kW
50kW
V_FB
DAC
Register
REF (+)
Register String
REF (-)
V_OUT
GND
Figure 27. DAC8551-Q1 Architecture
The input coding to the DAC8551-Q1 device is straight binary, so the ideal output voltage is given by:
V _OUT
+
D_IN
65536
V _REF
(1)
where D_IN = decimal equivalent of the binary code that is loaded to the DAC register; it can range from 0 to 65
535.
12
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