ZHCSE42D April 2015 – April 2019 ADS54J60
PRODUCTION DATA.
The ADC has a set of internal registers that can be accessed by the serial interface formed by the SEN (serial interface enable), SCLK (serial interface clock), and SDIN (serial interface data) pins, as shown in Figure 69. Legends used in Figure 69 are explained in Table 8. Serially shifting bits into the device is enabled when SEN is low. Serial data on SDIN are latched at every SCLK rising edge when SEN is active (low). The interface can function with SCLK frequencies from 2 MHz down to very low speeds (of a few Hertz) and also with a non-50% SCLK duty cycle.
SPI BITS | DESCRIPTION | BIT SETTINGS |
---|---|---|
R/W | Read/write bit | 0 = SPI write
1 = SPI read back |
M | SPI bank access | 0 = Analog SPI bank (master and ADC pages)
1 = JESD SPI bank (main digital, JESD analog, and JESD digital pages) |
P | JESD page selection bit | 0 = Page access
1 = Register access |
CH | SPI access for a specific channel of the JESD SPI bank | 0 = Channel A
1 = Channel B By default, both channels are being addressed. |
A[11:0] | SPI address bits | — |
D[7:0] | SPI data bits | — |
Table 9 shows the timing requirements for the serial interface signals in Figure 69.
MIN | TYP | MAX | UNIT | ||
---|---|---|---|---|---|
fSCLK | SCLK frequency (equal to 1 / tSCLK) | > dc | 2 | MHz | |
tSLOADS | SEN to SCLK setup time | 100 | ns | ||
tSLOADH | SCLK to SEN hold time | 100 | ns | ||
tDSU | SDIN setup time | 100 | ns | ||
tDH | SDIN hold time | 100 | ns |