AD5370BSTZ-REEL View Datasheet(PDF) - Analog Devices

Part Name

Description

Manufacturer

AD5370BSTZ-REEL

40-Channel,16-Bit, Serial Input, Voltage Output DAC

Analog Devices 

AD5370

TOGGLE MODE

The AD5370 has two X2 registers per channel, X2A and X2B,

that can be used to switch the DAC output between two levels

with ease. This approach greatly reduces the overhead required

by a microprocessor that would otherwise have to write to each

channel individually. When the user writes to the X1A, X2A, M,

or C register, the calculation engine takes a certain amount of

time to calculate the appropriate X2A or X2B value. If the

application only requires that the DAC output switch between

two levels, as is the case with a data generator, any method that

reduces the amount of calculation time necessary is advantageous.

For the data generator example, the user need only set the high

and low levels for each channel once by writing to the X1A and

X1B registers. The values of X2A and X2B are calculated and

stored in their respective registers. The calculation delay

therefore happens only during the setup phase, that is, when

programming the initial values. To toggle a DAC output

between the two levels, it is only required to write to the

relevant A/B select register to set the MUX2 register bit. Further-

more, because there are eight MUX2 control bits per register, it

is possible to update eight channels with a single write. Table 15

shows the bits that correspond to each DAC output.

Rev. 0 | Page 20 of 28

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