Rainbow-electronics MAX5106 Manual de usuario descargar pdf (Pagina 8)

Detailed Description

The MAX5105/MAX5106 quad, 8-bit DACs feature an

internal, nonvolatile EEPROM, which stores the DAC

states for initialization during power-up. These devices

consist of four resistor string DACs, four rail-to-rail

buffers, a 14-bit shift register, oscillator, power-on reset

(POR) circuitry, and five volatile and five nonvolatile

memory registers (Functional Diagram). The shift regis-

ter decodes the control and address bits, routing the

data to the proper memory registers. Data can be writ-

ten to a selected volatile register, immediately updating

the DAC output, or can be written to a selected non-

volatile register for storage.

The five volatile registers retain data as long as the

device is enabled and powered. Once power is

removed or the device is shut down, the volatile regis-

ters are cleared. The nonvolatile registers retain data

even after power is removed. On power-up, the POR

circuitry and internal oscillator control the transfer of

data from the nonvolatile registers to the volatile regis-

ters, which automatically initializes the device upon

startup. Data can be read from the nonvolatile registers

through DOUT.

MAX5105/MAX5106

Nonvolatile, Quad, 8-Bit DACs

8 _______________________________________________________________________________________

Pin Description

MAX5105 MAX5106

NAME FUNCTION

1 1 REFH1 DAC1 High Reference Input

2 2 REFH0 DAC0 High Reference Input

33V

Positive Supply Voltage

4 — RDY/BSY

Ready/Busy Open-Drain Output. Indicates the state of the nonvolatile memory.

Connect a 100kΩ pullup resistor from RDY/BSY to V

DD.

5 4 CLK Serial Clock Input

65CS Chip Select Input

7 6 DIN Serial Data Input

8 7 DOUT Serial Data Output

9 — MUTE Mute Input. Drives all DAC outputs to their respective REFL_ voltages.

10 8 GND Ground. Serves as REFL2 and REFL3 for the MAX5106.

11 9 REFL0 DAC0 Low Reference Input

12 10 REFL1 DAC1 Low Reference Input

13 — REFL2 DAC2 Low Reference Input

14 — REFL3 DAC3 Low Reference Input

15 11 OUT3 DAC3 Output

16 12 OUT2 DAC2 Output

17 13 OUT1 DAC1 Output

18 14 OUT0 DAC0 Output

19 15 REFH3 DAC3 High Reference Input

20 16 REFH2 DAC2 High Reference Input

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 18 19

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Rainbow-electronics MAX5106 Manual de usuario Pagina 8

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