TO OTHER

SERIAL DEVICES

MAX5120

MAX5121

DIN

SCLK

CS

MAX5120

MAX5121

MAX5120

MAX5121

DIN

DOUT

DOUT

DOUT

SCLK

CS

I

II

III

DIN

SCLK

CS

Figure 12. Daisy-Chaining Multiple Devices with the Digital I/Os DIN/DOUT

Daisy-Chaining Devices

Any number of MAX5120/MAX5121s can be daisy-

chained simply by connecting the serial data output pin

(DOUT) of one device to the digital input pin (DIN) of

the following device in the chain (Figure 12).

Another configuration allows several MAX5120/

MAX5121 DACs to share one common DIN signal line

(Figure 13). In this configuration, the data bus is com-

mon to all devices; data is not shifted through a daisy-

chain. However, more I/O lines are required in this

configuration, because each IC needs a dedicated CS

line.

+3V/+5V, 12-Bit, Serial Voltage-Output DACs

with Internal Reference

16

______________________________________________________________________________________

1000 0000 0001

+2.049V

+4.0950V

+1.0245V

+2.0475V

0111 1111 1111

+2.047V

+2.048V

+1.0235V

+1.024V

1000 0000 0000

0V

0000 0000 0000

0V

+1mV

0V

+0.5mV

1111 1111 1111

ANALOG OUTPUT

0000 0000 0001

INTERNAL REFERENCE

MSB

LSB

MAX5120

MAX5121

EXTERNAL REFERENCE

1000 0000 0001

+1.2207mV

+2.49878V

+610.35µV

+1.24939V

MSB

LSB

0111 1111 1111

-1.2207µV

0V

-610.35µV

0V

MAX5120

1000 0000 0000

MAX5121

0000 0000 0000

-2.5V

-2.49878V

-1.25V

-1.24939V

EXTERNAL REFERENCE

1111 1111 1111

ANALOG OUTPUT

0000 0000 0001

INTERNAL REFERENCE

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

Table 6. Bipolar Code Table for Figure 11

0

SUB-BIT

S0

0

0

0

0

0

DAC CONTENTS

0

SUB-BIT

SO

0

0

0

0

0

DAC CONTENTS