AD5744R Analog Devices, AD5744R Datasheet - Page 25

• Manufacturer Part Number: AD5744R
• Description: Complete Quad, 14-Bit, High Accuracy, Serial Input, Bipolar Voltage Output D/A Converter
• Manufacturer: Analog Devices

Specifications of AD5744R

• Resolution (bits): 14bit
• Dac Update Rate: 1MSPS
• Dac Settling Time: 8µs
• Max Pos Supply (v): +16.5V
• Single-supply: No
• Dac Type: Voltage Out
• Dac Input Format: Ser,SPI

Data Sheet
DATA REGISTER
The data register is addressed by setting the three REG bits to 010. The DAC address bits select the DAC channel with which the data
transfer takes place (see Table 10). The data bits are positioned in DB15 to DB2, as shown in Table 13.
Table 13. Programming the Data Register
REG2
0
COARSE GAIN REGISTER
The coarse gain register is addressed by setting the three REG bits to 011. The DAC address bits select the DAC channel with which the
data transfer takes place (see Table 10). The coarse gain register is a 2-bit register that allows the user to select the output range of each
DAC as shown in Table 15.
Table 14. Programming the Coarse Gain Register
REG2
0
Table 15. Output Range Selection
Output Range
±10 V (Default)
±10.2564 V
±10.5263 V
FINE GAIN REGISTER
The fine gain register is addressed by setting the three REG bits to 100. The DAC address bits select the DAC channel with which the data
transfer takes place (see Table 10). The AD5744R fine gain register is a 6-bit register that allows the user to adjust the gain of each DAC
channel by −8 LSBs to +7.75 LSBs in 0.25 LSB steps, as shown in Table 16 and Table 17. The adjustment is made to both the positive full-
scale points and the negative full-scale points simultaneously, with each point adjusted by one-half of one step. The fine gain register
coding is twos complement.
Table 16. Programming the Fine Gain Register
REG2
1
Table 17. Fine Gain Register Options
Gain Adjustment
+7.75 LSBs
+7.5 LSBs
No Adjustment (Default)
−7.75 LSBs
−8 LSBs
REG1
1
REG1
1
REG1
0
REG0
REG0
1
0
REG0
0
A2
A2
DAC address
DAC address
FG5
0
0
0
1
1
A2
A1
A1
DAC address
A1
A0
A0
CG1
0
0
1
FG4
1
1
0
0
0
A0
DB15 to DB6
Don’t care
Rev. E | Page 25 of 32
FG3
1
1
0
0
0
DB5
FG5
14-bit DAC data
DB15 to DB2
DB15 to DB2
Don’t care
DB4
FG4
FG2
1
1
0
0
0
CG0
0
1
0
DB3
FG3
FG1
1
1
0
0
0
DB2
FG2
DB1
FG1
FG0
1
0
0
1
0
AD5744R
DB1
X
DB1
CG1
DB0
FG0
DB0
X
DB0
CG0