Motor de Búsqueda de Datasheet de Componentes Electrónicos |
|
AD7243BN Datasheet(PDF) 9 Page - Analog Devices |
|
AD7243BN Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page REV. A –9– AD7243 MICROPROCESSOR INTERFACING Microprocessor interfacing to the AD7243 is via a serial bus which uses standard protocol compatible with DSP processors and microcontrollers. The communications channel requires a three-wire interface consisting of a clock signal, a data signal and a synchronization signal. The AD7243 requires a 16-bit data word with data valid on the falling edge of SCLK. For all the interfaces, the DAC update may be done automatically when all the data is clocked in or it may be done under control of LDAC. Figures 11 to 16 show the AD7243 configured for interfacing to a number of popular DSP processors and microcontrollers. AD7243–ADSP-2101/ADSP-2102 Interface Figure 11 shows a serial interface between the AD7243 and the ADSP-2101/ADSP-2102 DSP processor. The ADSP-2101/ ADSP-2102 contains two serial ports, and either port may be used in the interface. The data transfer is initiated by TFS going low. Data from the ADSP-2101/ADSP-2102 is clocked into the AD7243 on the falling edge of SCLK. When the data transfer is complete, TFS is taken high. In the interface shown the DAC is updated using an external timer which generates an LDAC pulse. This could also be done using a control or decoded ad- dress line from the processor. Alternatively, the LDAC input could be hard wired low and in this case the update takes place automatically on the sixteenth falling edge of SCLK. ADSP - 2101/ ADSP - 2102* TIMER TFS SCLK DT LDAC SYNC SCLK SDIN AD7243* *ADDITIONAL PINS OMITTED FOR CLARITY Figure 11. AD7243–ADSP-2101/ADSP-2102 Interface AD7243–DSP56000 Interface A serial interface between the AD7243 and the DSP56000 is shown in Figure 12. The DSP56000 is configured for Normal Mode Asynchronous operation with Gated Clock. It is also set up for a 16-bit word with SCK and SC2 as outputs and the FSL control bit set to a “0.” SCK is internally generated on the DSP56000 and applied to the AD7243 SCLK input. Data from the DSP56000 is valid on the falling edge of SCK. The SC2 output provides the framing pulse for valid data. This line must be inverted before being applied to the SYNC input of the AD7243. The LDAC input of the AD7243 is connected to DGND so the update of the DAC latch takes place automatically on the six- teenth falling edge of SCLK. An external timer could also be used as in the previous interface if an external update is required. DSP56000 SCK STD SC2 LDAC SCLK SDIN AD7243* SYNC *ADDITIONAL PINS OMITTED FOR CLARITY Figure 12. AD7243–DSP56000 Interface AD7243–TMS32020 Interface Figure 13 shows a serial interface between the AD7243 and the TMS32020 DSP processor. In this interface, the CLKX and FSX signals for the TMS32020 should be generated using ex- ternal clock/timer circuitry. The FSX pin of the TMS32020 must be configured as an input. Data from the TMS32020 is valid on the falling edge of CLKX. The clock/timer circuitry generates the LDAC signal for the AD7243 to synchronize the update of the output with the serial transmission. Alternatively, the automatic update mode may be selected by connecting LDAC to DGND. LDAC SYNC SCLK SDIN AD7243* *ADDITIONAL PINS OMITTED FOR CLARITY CLOCK/ TIMER TMS32020 FSX CLKX DX Figure 13. AD7243–TMS32020 Interface |
Número de pieza similar - AD7243BN |
|
Descripción similar - AD7243BN |
|
|
Enlace URL |
Política de Privacidad |
ALLDATASHEET.ES |
¿ALLDATASHEET es útil para Ud.? [ DONATE ] |
Todo acerca de Alldatasheet | Publicidad | Contáctenos | Política de Privacidad | Intercambio de Enlaces | Lista de Fabricantes All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |