JAJSDZ9 October 2017 ADS54J64
PRODUCTION DATA.
Table 62 lists the recommended start-up sequence for a 500-MSPS, Nyquist 2 operation with DDC mode 8 enabled.
STEP | DESCRIPTION | REGISTER ADDRESS | REGISTER DATA | COMMENT |
---|---|---|---|---|
1 | Provide a 1.15-V power supply (AVDD, DVDD) | — | — | — |
2 | Provide a 1.9-V power supply (AVDD19) | — | — | A 1.15-V supply must be supplied first for proper operation. |
3 | Provide a clock to CLKINM, CLKINP and a SYSREF signal to SYSREFM, SYSREFP | — | — | SYSREF must be established before SPI programming. |
4 | Pulse a reset (low to high to low) via a hardware reset (pin 48), wait 100 µs | — | — | Hardware reset loads all trim register settings. |
5 | Issue a software reset to initialize the registers | 00h | 81h | — |
6 | Set the high SNR mode for channel pairs AB and CD, select trims for 500-MSPS operation | 11h | 00h | Select the DIGTOP page. |
12h | 01h | |||
13h | 00h | |||
ABh | 01h | Set the high SNR mode for channels A and B. | ||
ACh | 01h | Set the high SNR mode for channels C and D. | ||
ADh | 08h | Select DDC bypass mode (mode 8) for channels A and B. | ||
AEh | 08h | Select DDC bypass mode (mode 8) for channels C and D. | ||
64h | 02h | Select trims for 500-MSPS operation. | ||
7 | Set up the SerDes configuration | 11h | 00h | Select the SerDes_AB and SerDes_CD pages. |
12h | 60h | |||
13h | 00h | |||
26h | 0Fh | Set the K value to 16 frames per multi-frame. | ||
20h | 80h | Enable the K value from register 26h. | ||
8 | ADC calibration | 11h | FFh | Select the ADC_A1, ADC_A2, ADC_B1, ADC_B2, ADC_C1, ADC_C2, ADC_D1, and ADC_D2 pages. |
12h | 00h | |||
13h | 00h | |||
D5h | 08h | Enable ADC calibration. | ||
Wait 2 ms | ADC calibration time. | |||
D5h | 00h | Disable ADC calibration. | ||
2Ah | 00h | Internal trims. | ||
CFh | 50h | |||
9 | Select trims for the second Nyquist | 11h | 00h | Select the channel A, channel B, channel C, and channel D pages. |
12h | 1Eh | |||
13h | 00h | |||
2Dh | 02h | Select trims for the second Nyquist. | ||
10 | Load linearity trims | 11h | 00h | Select the DIGTOP page. |
12h | 01h | |||
13h | 00h | |||
8Ch | 02h | Load linearity trims. | ||
B7h | 01h | |||
B7h | 00h | |||
11 | Disable SYSREF | 11h | 00h | Select the ANALOG page. |
12h | 00h | |||
13h | 01h | |||
6Ah | 02h | Disable SYSREF. |
Table 63 lists the recommended start-up sequence for a 500-MSPS, Nyquist 2, 2x interleaved dual ADC operation.
STEP | DESCRIPTION | REGISTER ADDRESS | REGISTER DATA | COMMENT |
---|---|---|---|---|
1 | Provide a 1.15-V power supply (AVDD, DVDD) | — | — | — |
2 | Provide a 1.9-V power supply (AVDD19) | — | — | A 1.15-V supply must be supplied first for proper operation. |
3 | Provide a clock to CLKINM, CLKINP and a SYSREF signal to SYSREFM, SYSREFP | — | — | SYSREF must be established before SPI programming. |
4 | Pulse a reset (low to high to low) via a hardware reset (pin 48), wait 100 µs | — | — | Hardware reset loads all trim register settings. |
5 | Issue a software reset to initialize the registers | 00h | 81h | — |
6 | Set the high SNR mode for channel pairs AB and CD, select trims for 500-MSPS operation | 11h | 00h | Select the DIGTOP page. |
12h | 01h | |||
13h | 00h | |||
A5h | 03h | Enable averaging on the AB and CD channel pair. | ||
A6h | 20h | Enable the averaging option. | ||
ABh | 03h | Set the high SNR and interleave mode for channels A and B. | ||
ACh | 03h | Set the high SNR and interleave mode for channels C and D. | ||
ADh | 08h | Select DDC bypass mode (mode 8) for channels A and B. | ||
AEh | 08h | Select DDC bypass mode (mode 8) for channels C and D. | ||
64h | 02h | Select trims for 500-MSPS operation. | ||
7 | Set up the SerDes configuration | 11h | 00h | Select the SERDES_AB and SERDES_CD pages. |
12h | 60h | |||
13h | 00h | |||
26h | 0Fh | Set the K value to 16 frames per multi-frame. | ||
20h | 80h | Enable the K value from register 26h. | ||
8 | ADC calibration | 11h | FFh | Select the ADC_A1, ADC_A2, ADC_B1, ADC_B2, ADC_C1, ADC_C2, ADC_D1, and ADC_D2 pages. |
12h | 00h | |||
13h | 00h | |||
D5h | 08h | Enable ADC calibration. | ||
Wait 2 ms | ADC calibration time. | |||
D5h | 00h | Disable ADC calibration. | ||
2Ah | 00h | Internal trims. | ||
CFh | 50h | |||
9 | Select trims for the second Nyquist | 11h | 00h | Select the channel A, channel B, channel C, and channel D pages. |
12h | 1Eh | |||
13h | 00h | |||
2Dh | 02h | Select trims for the second Nyquist. | ||
10 | Load linearity trims | 11h | 00h | Select the DIGTOP page. |
12h | 01h | |||
13h | 00h | |||
8Ch | 02h | Load linearity trims. | ||
B7h | 01h | |||
B7h | 00h | |||
11 | Disable SYSREF | 11h | 00h | Select the ANALOG page. |
12h | 00h | |||
13h | 01h | |||
6Ah | 02h | Disable SYSREF. |