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ADIS16136AMLZ Datasheet(PDF) 11 Page - Analog Devices |
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ADIS16136AMLZ Datasheet(HTML) 11 Page - Analog Devices |
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11 / 20 page  Data Sheet ADIS16136 Rev. A | Page 11 of 20 DIGITAL PROCESSING CONFIGURATION Figure 18 provides a block diagram for the sampling and digital filter stages inside the ADIS16136. Table 15 provides a summary of registers for sample rate and filter control. Table 15. Digital Processing Registers Register Name Address Description SMPL_PRD 0x1E Sample rate control AVG_CNT 0x20 Digital filtering and range control DEC_RATE 0x22 Decimation rate setting INTERNAL SAMPLE RATE The SMPL_PRD register in Table 16 provides a programmable control for the internal sample rate. Use the following formula to calculate the decimal number for the code to write into this register: ( ) ;1 768 , 32 _ − = S f PRD SMPL fS ≤ 2048 SPS The factory default setting for SMPL_PRD sets the internal sample rate to a rate of 1024 SPS; the minimum setting for the SMPL_PRD register is 0x000F, which results in an internal sample rate of 2048 SPS. Table 16. SMPL_PRD Bit Descriptions Bits Description (Default = 0x001F) [15:0] Clock setting bits; sets fS in Figure 18 INPUT CLOCK CONFIGURATION Set SMPL_PRD = 0x0000 (DIN = 0x9F00, then DIN = 0x9E00) to disable the internal clock and enable DIO4/CLKIN as a clock input pin. DIGITAL FILTERING The AVG_CNT register (see Table 17) provides user controls for the low-pass filter. This filter contains two cascaded averaging filters that provide a Bartlett window FIR filter response (see Figure 18). For example, set AVG_CNT[7:0] = 0x04 (DIN = 0xA004) to set each stage to 16 taps. When used with the default sample rate of 1024 SPS, this establishes a −3 dB bandwidth of approximately 24 Hz for this filter. Figure 17. Bartlett Window FIR Filter Frequency Response Table 17. AVG_CNT Bit Descriptions Bits Description (Default = 0x0000) [15:3] Don’t care [2:0] Binary; B variable in Figure 18; maximum = 110 (6) 0 –20 –40 –60 –80 –100 –120 –140 0.001 0.01 0.1 1 FREQUENCY ( f/fS) N = 2 N = 4 N = 16 N = 64 |
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