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AD7612 Datasheet(PDF) 30 Page - Analog Devices |
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AD7612 Datasheet(HTML) 30 Page - Analog Devices |
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30 / 32 page  AD7612 Data Sheet Rev. A | Page 30 of 32 SCIN SCCLK WARP START TEN 123 67 BUSY HW/SW = 0 INVSCLK = 0 CNVST SCCS t8 t36 t35 t37 4 PD 5 BIPOLAR IMPULSE OB/2C X 89 SER/PAR = 1 BIP = 0 OR 1 TEN = 0 OR 1 IMPULSE = 0 OR 1 WARP = 0 OR 1 PD = 0 t33 t34 t31 X t31 Figure 45. Serial Configuration Port Timing MICROPROCESSOR INTERFACING The AD7612 is ideally suited for traditional dc measurement applications supporting a microprocessor, and ac signal processing applications interfacing to a digital signal processor. The AD7612 is designed to interface with a parallel 8-bit or 16-bit wide interface, or with a general-purpose serial port or I/O ports on a microcontroller. A variety of external buffers can be used with the AD7612 to prevent digital noise from coupling into the ADC. SPI Interface The AD7612 is compatible with SPI and QSPI digital hosts and DSPs such as Blackfin® ADSP-BF53x and ADSP-218x/ADSP-219x. Figure 46 shows an interface diagram between the AD7612 and the SPI-equipped ADSP-219x. To accommodate the slower speed of the DSP, the AD7612 acts as a slave device, and data must be read after conversion. This mode also allows the daisy-chain feature. The convert command could be initiated in response to an internal timer interrupt. The reading process can be initiated in response to the end-of- conversion signal (BUSY going low) using an interrupt line of the DSP. The serial peripheral interface (SPI) on the ADSP-219x is configured for master mode (MSTR) = 1, clock polarity bit (CPOL) = 0, clock phase bit (CPHA) = 1, and SPI interrupt enable (TIMOD) = 0 by writing to the SPI control register (SPICLTx). It should be noted that to meet all timing requirements, the SPI clock should be limited to 17 Mbps allowing it to read an ADC result in less than 1 μs. When a higher sampling rate is desired, use one of the parallel interface modes. BUSY CS SDOUT SCLK CNVST AD76121 PFx SPIxSEL (PFx) MISOx SCKx PFx OR TFSx ADSP-219x1 1ADDITIONAL PINS OMITTED FOR CLARITY. DVDD SER/PAR EXT/INT RD INVSCLK Figure 46. Interfacing the AD7612 to SPI Interface |
Similar Part No. - AD7612_15 |
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Similar Description - AD7612_15 |
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