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DAC124S085 Datasheet(PDF) 15 Page - Texas Instruments

Part No. DAC124S085
Description  DAC124S085 12-Bit Micro Power Quad Digital-to-Analog Converter With Rail-to-Rail Output
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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DAC124S085 Datasheet(HTML) 15 Page - Texas Instruments

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VA
R
R
R
R
To Output Amplifier
R
15
DAC124S085
www.ti.com
SNAS348G – MAY 2006 – REVISED APRIL 2016
Product Folder Links: DAC124S085
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Copyright © 2006–2016, Texas Instruments Incorporated
8.3 Feature Description
8.3.1 DAC Section
The DAC124S085 is fabricated on a CMOS process with an architecture that consists of switches and resistor
strings that are followed by an output buffer. The reference voltage is externally applied at VREFIN and is shared
by all four DACs.
For simplicity, a single resistor string is shown in Figure 29. This string consists of 4096 equal valued resistors
with a switch at each junction of two resistors, plus a switch to ground. The code loaded into the DAC register
determines which switch is closed, connecting the proper node to the amplifier. The input coding is straight
binary with an ideal output voltage calculated with Equation 1.
VOUTA,B,C,D = VREFIN × (D / 4096)
where
D is the decimal equivalent of the binary code that is loaded into the DAC register
(1)
D can take on any value between 0 and 4095. This configuration ensures that the DAC is monotonic.
Figure 29. DAC Resistor String
8.3.2 Output Amplifiers
The output amplifiers are rail-to-rail, providing an output voltage range of 0 V to VA when the reference is VA. All
amplifiers, even rail-to-rail types, exhibit a loss of linearity as the output approaches the supply rails (0 V and VA,
in this case). For this reason, linearity is specified over less than the full output range of the DAC. However, if the
reference is less than VA, there is only a loss in linearity in the lowest codes. The output capabilities of the
amplifier are described in Electrical Characteristics.
The output amplifiers are capable of driving a load of 2 k
Ω in parallel with 1500 pF to ground or to VA. The zero-
code and full-scale outputs for given load currents are available in Electrical Characteristics.
8.3.3 Reference Voltage
The DAC124S085 uses a single external reference that is shared by all four channels. The reference pin, VREFIN,
is not buffered and has an input impedance of 30 k
Ω. TI recommends driving the VREFIN by a voltage source with
low-output impedance. The reference voltage range is 1 V to VA, providing the widest possible output dynamic
range.


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