8143 datasheet(15/24 Pages) MAXWELL

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12-Bit Serial Daisy-Chain D/A Converter

8143

07.23.03 REV 3

Applications Information

Unipolar Operation (2-Quadrant)

The circuit shown in Figures 16 and 17 may be used with an ac or dc reference voltage. The circuit’s output will range

between 0V and 10V (4095/4096) depending upon the digital input and the analog output is shown in Table 4. The

REF voltage range is the maximum input voltage range of the op amp or ± 25V, whichever is lowest.

No operation (input register

and SRO)

Reset DAC register to zero

code (Code: 0000 0000

0000) Asynchronous opera-

tions)

2,3

No operation (DAC register

and SRO)

Load DAC register with the

contents of input register

1. Serial data is loaded into Input Register MSB first, on edges shown. is positive edges, is negative edge.

2. 0 = Logic LOW, 1 = Logic HIGH, X = Don’t care.

3. CLR = 0 asynchronously resets DAC register to 0000 0000 0000, but has no effect on Input Register.

TABLE 4. UNIPOLAR CODE TABLE1,2

1. Nominal full scale for the circuits of Figures 16 and 17 is given by

FS = -V

REF (4095/4096)

2. Nominal LSB magnitude for the circuit of Figure 16 and 17 is given by

LSB = V

REF(1/4096) or VREF(2

-N).

DIGITAL INPUT

MSBLSB

NOMINAL ANALOG OUTPUT (V

OUT AS SHOWN IN

FIGURES 16 AND 17)

1 1 1 1 1 1 1 1 1 1 1 1

-V

REF (4095/4096)

1 0 0 0 0 0 0 0 0 0 0 1

-V

REF (2049/4096)

1 0 0 0 0 0 0 0 0 0 0 0

-V

REF (2048/4096) = -VREF/2

0 1 1 1 1 1 1 1 1 1 1 1

-V

REF (2047/4096)

0 0 0 0 0 0 0 0 0 0 0 1

-V

REF (1/4096)

0 0 0 0 0 0 0 0 0 0 0 0

-V

REF (0/4096) = 0

TABLE 1. TRUTH TABLE

INPUT REGISTER/DIGITAL

OUTPUT

CONTROL INPUTS

DAC

CONTROL INPUT

OPERATION

NOTES

STB4

STB3

STB2

STB1

CLR

LD2

LD1

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