JAJSES4A February 2018 – April 2020 ADC08DJ3200
PRODUCTION DATA.
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
RESERVED | SRC_AVG | SRC_HDUR | |||||
R/W-0000 | R/W-01 | R/W-01 |
Bit | Field | Type | Reset | Description |
---|---|---|---|---|
7-4 | RESERVED | R/W | 0000 00 | RESERVED |
3-2 | SRC_AVG | R/W | 01 | Specifies the amount of averaging used for SYSREF calibration. Larger values increase calibration time and reduce the variance of the calibrated value.
0: 4 averages 1: 16 averages 2: 64 averages 3: 256 averages |
1-0 | SRC_HDUR | R/W | 01 | Specifies the duration of each high-speed accumulation for SYSREF Calibration. If the SYSREF period exceeds the supported value, the calibration fails. Larger values increase calibration time and support longer SYSREF periods. For a given SYSREF period, larger values also reduce the variance of the calibrated value.
0: 4 cycles per accumulation, max SYSREF period of 85 DEVCLK cycles 1: 16 cycles per accumulation, max SYSREF period of 1100 DEVCLK cycles 2: 64 cycles per accumulation, max SYSREF period of 5200 DEVCLK cycles 3: 256 cycles per accumulation, max SYSREF period of 21580 DEVCLK cycles Max duration of SYSREF calibration is bounded by: TSYSREFCAL (in DEVCLK cycles) = 256 × 19 × 4(SRC_AVG + SRC_HDUR + 2) |