MAX5312EAE+T【PDF 6/19 页】IC DAC 12BIT 5V/10V SER 16-SSOP

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MAX5312

Data in the shift register is transferred to the input register

during the appropriate software command only. Data in

the input register is transferred to the DAC register in one

of two ways: using the software command, or through

external logic control using the asynchronous load input

(LDAC). Table 2 shows the software commands that

transfer the data from the shift register to the input and/or

DAC registers. The CLR, an external logic control, asyn-

chronously forces the input and DAC registers to zero

code, and the output to 0V, in both unipolar and bipolar

modes. The interface timing is shown in Figures 2 and 3.

Wait a minimum of 100ns after CS goes high before

implementing LDAC or CLR. If either of these logic

inputs activates during a data transfer, the incoming

data is corrupted and needs to be reloaded. For soft-

ware control only, connect LDAC and CLR high.

DAC Architecture

The MAX5312 uses an inverted DAC ladder architec-

ture to convert the digital input into an analog output

voltage. The digital input controls weighted-switches

that connect the DAC ladder nodes to either REF or

GND (Figure 4). The sum of the weights produces the

analog equivalent of the digital-input word and is then

buffered at the output.

±10V, 12-Bit, Serial, Voltage-Output DAC

______________________________________________________________________________________

CONTROL BITS

DATA BITS

MSB

LSB

D11

D10

Table 1. Serial-Data Format

CONTROL BITS*

INPUT DATA

D11–D0

FUNCTION

XXXXXXXXXXXX

No operation; command is ignored.

12-bit DAC data

Load input register from shift register; DAC output unchanged.

12-bit DAC data

Load input and DAC registers from shift register; DAC output updated.

XXXXXXXXXXXX

Load DAC register from input register; DAC output updated; input register unchanged.

XXXXXXXXXXXX

Enter shutdown; input and DAC registers unchanged.

XXXXXXXXXXXX

Exit shutdown; input and DAC registers unchanged.

Table 2. Serial-Interface Programming Commands

X = Don’t care.

*All unlisted commands are reserved commands. Do not use.

SCLK

DIN

COMMAND EXECUTED

(1)

D11

D10

Figure 2. Serial-Interface Signals

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