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Rainbow Electronics MAX5123 User Manual

Page 17

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MAX5122/MAX5123

+5V/+3V, 12-Bit, Serial, Force/Sense DACs

with 10ppm/°C Internal Reference

______________________________________________________________________________________

17

V

REF

(2049 / 4096) 2

1000 0000 0001

0

0

V

REF

(2047 / 4096) 2

0111 1111 1111

0

0

V

REF

(2048 / 4096) 2

1000 0000 0000

0

0000 0000 0000

0

0

V

REF

(4095 / 4096) 2

1111 1111 1111

V

REF

(1 / 4096) 2

0000 0000 0001

DAC CONTENTS

SUB-BIT

S0

EXTERNAL REFERENCE

MAX5122/MAX5123

V

REF

[ {2 (2049 / 4096)} - 1]

1000 0000 0001

0

0

+610.35µV

+1.24939V

DAC CONTENTS

V

REF

[ {2 (2047 / 4096)} - 1]

0111 1111 1111

0

0

-610.35µV

0V

V

REF

[ {2 (2048 / 4096)} - 1]

1000 0000 0000

-V

REF

0000 0000 0000

0

0

-1.25V

-1.24939V

V

REF

[ {2 (4095 / 4096)} - 1]

1111 1111 1111

V

REF

[ {2 (1 / 4096)} - 1]

0000 0000 0001

Table 5. Unipolar Code Table (Gain = +1.6384V/V)

Table 6. Bipolar Code Table (Figure 10)

+2.50122V

+4.99878V

+1.25061V

+2.49939V

+2.49878V

+2.5V

+1.24939V

+1.25V

MAX5122

MAX5123

0V

+1.2207mV

0V

+610.35µV

INTERNAL REFERENCE

MSB LSB

ANALOG OUTPUT

ANALOG OUTPUT

+1.2207mV

+2.49878V

-1.2207mV

0V

-2.5V

-2.49878V

TO OTHER
SERIAL DEVICES

MAX5122
MAX5123

DIN

SCLK

CS

MAX5122
MAX5123

MAX5122
MAX5123

DIN

DOUT

DOUT

DOUT

SCLK

CS

I

II

III

DIN

SCLK

CS

Figure 11. Daisy-Chaining Multiple Devices with the Digital I/Os DIN/DOUT

INTERNAL REFERENCE

SUB-BIT

S0

MAX5123

EXTERNAL REFERENCE

MAX5122/MAX5123

MAX5122

MSB LSB