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System Simulator >
System Component Models >
Data Converters >
Serial Digital to Analog Converter (DAC)

Serial Digital to Analog Converter (DAC)

Property	Description	Units	Default	Range/Type
NBITS	Number of bits	None	8	(0, Inf)/Real
VH	Maximum output voltage, in voltage units	Volt	-1V	(-Inf, Inf)/Real
VL	Minimum output voltage, in voltage units	Volt	1V	(-Inf, Inf)/Real
RIN1	Input1 impedance	Ohm	Inf	(0, Inf]/Real
RIN2	Input2 impedance	Ohm	Inf	(0, Inf]/Real
ROUT	Output impedance	Ohm	0	[0, Inf)/Real
Ports
Input1	Input1 bit stream (real)
Input2	Input2 clock input (real)
Output	Output signal (real)

Notes

1. This DAC accepts a serial binary input and converts it into the appropriate analog voltage. At each positive clock edge (when the clock voltage becomes greater than 0.5V) the input signal is sampled and compared to 0.5V to determine if it is a logic 0
or 1. Once nbits bits are clocked into the DAC, the output voltage is calculated. It is assumed that the LSB is clocked in first and the MSB is clocked in last.

2. The figure below shows outputs for an ADC and A DAC with Nbit s= 4, VL = -1V and l = 1V. The clock has a rate of 0.015625 µs, thus, the DAC element outputs a new analog sample every 0.125 µs.

Netlist Form

DAC:Name n1 n2 n3 NBITS=val VL=val VH=val [Rin1=val] [Rin2=val][Rout=val]

Netlist Example

DAC:1 1 2 3 NBITS=4 VL=-1 VH=1

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