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ADC32RF52 Datasheet(PDF) 45 Page - Texas Instruments |
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ADC32RF52 Datasheet(HTML) 45 Page - Texas Instruments |
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45 / 108 page  The NCO phase accumulators can be reset using the external SYSREF signal. A SYSREF mask can be setup such the SYSREF signal only goes to the NCO and the remaining device remains unaffected. The following register writes configure the SYSREF mask to only affect the NCO. After completion the SYSREF mask should be set back to default. Table 7-26. Example Register Writes to configure the SYSREF MASK ADDR DATA DESCRIPTION 0x05 0x18 Select DDCAB/CD page 0x181 0x40 Reset NCO phases with SYSREF toggle 0x05 0x02 Select Digital Page 0x357 0xA2 SYSREF mask settings (0x00 is mask default) 0x358 0x02 SYSREF mask settings (0x00 is mask default) 7.3.5.7 Fast Frequency Hopping The ADC32RF52 supports several different options to update the NCO frequencies. Fast frequency hopping can be achieved in one of the following ways: • Using the GPIO1/2 pins to select the NCO frequency • Using the GPIO1/2, SPISEL and SCLK/SDIO pins to select the NCO frequency • Using the GPIO1/2 pins to program the NCO frequency selection (Fast SPI) NCO CONTROL SCLK SDATA SPISEL GPIO1 GPIO2 NCO SEL MODE Regular SPI (default) SPI Interface 0 used for other purpose 00 GPIO1/2 SPI Interface 0 used for NCO control 00 GPIO1/2, SPISEL, SCLK/SDATA NCO CONTROL 1 used for NCO control 00 FAST SPI SPI Interface 1 SDATA SCLK 10 The internal NCO is switched very quickly however the switching time depends primarily on the time it takes to flush out the decimation filter as shown in Table 7-27. Table 7-27. NCO switching time (FS = 1.5 GSPS) vs decimation setting Decimation Setting NCO Switching Time /4 ~ 500 ns /8 ~ 700 ns /16 ~ 1.2 us /32 ~ 2 us /64 ~ 4 us /128 ~ 8 us 7.3.5.7.1 Fast frequency hopping using the GPIO1/2 pins The NCO frequency is selected as shown in Table 7-28. This mode is enabled with the following register writes: 1. Set 0x234 to 0x03 (NCO SEL MODE = 0, GPIO MODE = 3) Table 7-28. NCO Frequency Selection using GPIO1/2 Pins # OF BANDS GPIO2 GPIO1 GPIO2 GPIO1 GPIO2 GPIO1 GPIO2 GPIO1 SINGLE 0 0 0 0 0 0 NCO1 CHA [1:0] 0 0 0 0 0 0 NCO1 CHB [1:0] DUAL 0 0 0 0 NCO2 CHA [1:0] NCO1 CHA [1:0] 0 0 0 0 NCO2 CHB [1:0] NCO1 CHB [1:0] QUAD NCO4 CHA [1:0] NCO3 CHA [1:0] NCO2 CHA [1:0] NCO1 CHA [1:0] NCO4 CHB [1:0] NCO3 CHB [1:0] NCO2 CHB [1:0] NCO1 CHB [1:0] www.ti.com ADC32RF52 SBASAI6 – SEPTEMBER 2023 Copyright © 2023 Texas Instruments Incorporated Submit Document Feedback 45 Product Folder Links: ADC32RF52 |
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