EVAL-AD5371EBZ Analog Devices Inc, EVAL-AD5371EBZ Datasheet - Page 21

• Manufacturer Part Number: EVAL-AD5371EBZ
• Description: BOARD EVAL FOR AD5371
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD5371EBZ

• Number Of Dac's: 40
• Number Of Bits: 14
• Outputs And Type: 40, Single Ended
• Sampling Rate (per Second): 540k
• Data Interface: Serial
• Settling Time: 20µs
• Dac Type: Voltage
• Voltage Supply Source: Dual ±
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD5371
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TOGGLE MODE
The AD5371 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, which would otherwise need to write to
each channel individually. When the user writes to the X1A,
X1B, M, or C register, the calculation engine takes a certain
amount of time to calculate the appropriate X2A or X2B value.
If an application, such as a data generator, requires that the
DAC output switch between two levels only, any method that
reduces the amount of calculation time necessary is advantageous.
Table 10. DACs Selected by A/B Select Registers
A/B Select
Register
0
1
2
3
4
1
If the bit is set to 0, Register X2A is selected. If the bit is set to 1, Register X2B is selected.
F7
VOUT7
VOUT15
VOUT23
VOUT31
VOUT39
F6
VOUT6
VOUT14
VOUT22
VOUT30
VOUT38
F5
VOUT5
VOUT13
VOUT21
VOUT29
VOUT37
Rev. B | Page 21 of 28
F4
VOUT4
VOUT12
VOUT20
VOUT28
VOUT36
For the data generator example, the user needs only to 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. Furthermore, because there are eight
MUX2 control bits per register, it is possible to update eight
channels with a single write. Table 10 shows the bits that corre-
spond to each DAC output.
Bits
1
F3
VOUT3
VOUT11
VOUT19
VOUT27
VOUT35
F2
VOUT2
VOUT10
VOUT18
VOUT26
VOUT34
F1
VOUT1
VOUT9
VOUT17
VOUT25
VOUT33
AD5371
F0
VOUT0
VOUT8
VOUT16
VOUT24
VOUT32