R

R

R

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To Output Amplifier

R

15

DAC124S085

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SNAS348G – MAY 2006 – REVISED APRIL 2016

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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

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.

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

in this case). For this reason, linearity is specified over less than the full output range of the DAC. However, if the

amplifier are described in Electrical Characteristics.

The output amplifiers are capable of driving a load of 2 k

code and full-scale outputs for given load currents are available in Electrical Characteristics.

8.3.3 Reference Voltage

is not buffered and has an input impedance of 30 k

range.