AD9707-EB Analog Devices Inc, AD9707-EB Datasheet - Page 39

• Manufacturer Part Number: AD9707-EB
• Description: BOARD EVAL FOR AD9707
• Manufacturer: Analog Devices Inc
• Series: TxDAC®r

Specifications of AD9707-EB

• Number Of Dac's: 1
• Number Of Bits: 14
• Outputs And Type: 1, Differential
• Sampling Rate (per Second): 175M
• Data Interface: Serial
• Settling Time: 11ns
• Dac Type: Current
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD9707
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

The calibration clock frequency is equal to the DAC clock
divided by the division factor chosen by the DIVSEL value. The
frequency of the calibration clock must be set to under 10 MHz
for reliable calibrations. Best results are obtained by setting
DIVSEL[2:0] (Register 0x0E, Bit 2 to Bit 0) to produce the
lowest frequency calibration clock frequency that the user’s
system requirements allow.
To perform a device self-calibration, the following procedure
can be used.
1.
2.
3.
4.
5.
6.
The AD9704/AD9705/AD9706/AD9707 devices allow reading and
writing of the calibration coefficients. There are 33 coefficients in
total. The read/write feature of the coefficients can be useful for
improving the results of the self-calibration routine by averaging
the results of several calibration results and loading the aver-
aged results back into the device. The reading and writing
routines follow.
Enable the calibration clock by setting the CALCLK bit
(Register 0x02, Bit 0).
Enable self-calibration by writing 0x40 to Register 0x0F.
Wait approximately 4500 calibration clock cycles. Each
calibration clock cycle is between 2 and 256 DAC clock
cycles, depending on the value of DIVSEL[2:0].
Check if the self-calibration has completed by reading the
CALSTAT bit (Register 0x0F, Bit 7). A Logic 1 indicates the
calibration has completed.
When the self-calibration has completed, write 0x00 to
Register 0x0F.
Disable the calibration clock by clearing the CALCLK Bit
(Register 0x02, Bit 0).
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To read the calibration coefficients:
1.
2.
3.
4.
5.
6.
7.
To write the calibration coefficients to the device:
1.
2.
3.
4.
5.
6.
7.
Enable the calibration clock by setting the CALCLK bit
(Register 0x02, Bit 0).
Write the address of the first coefficient (0x00) to
Set the SMEMRD bit (Register 0x0F, Bit 2) by writing 0x04
Read the value of the first coefficient by reading the
Clear the SMEMRD bit by writing 0x00 to Register 0x0F.
Repeat Step 2 through Step 5 for each of the remaining
Disable the calibration clock by clearing the CALCLK Bit
(Register 0x02, Bit 0).
Enable the calibration clock by setting the CALCLK bit
(Register 0x02, Bit 0).
Set the SMEMWR bit (Register 0x0F, Bit 3) by writing 0x08
Write the address of the first coefficient (0x00) to
Write the value of the first coefficient to Register 0x11.
Repeat Step 2 and Step 3 for each of the remaining
Clear the SMEMWR bit by writing 0x00 to Register 0x0F.
Disable the calibration clock by clearing the CALCLK bit
Register 0x10.
to Register 0x0F.
contents of Register 0x11.
32 coefficients by incrementing the address by one for
each read.
to Register 0x0F.
Register 0x10.
32 coefficients by incrementing the address by one for
each write.
(Register 0x02, Bit 0).
AD9704/AD9705/AD9706/AD9707