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AD6422AST Datasheet(PDF) 6 Page - Analog Devices |
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AD6422AST Datasheet(HTML) 6 Page - Analog Devices |
6 / 8 page AD20msp415 –6– REV. 0 Digital Interface from the GSMP to Accessories To allow proper control of external accessories like a car kit, the AD6422 provides a 10-pin accessory interface comprised of eight general purpose I/O channels, one chip select and one power control signal. Digital Test Interface The AD6421 and the AD6422 both support advanced test methodologies by providing JTAG Boundary Scan. Addition- ally, the AD6422 provides Test/Mode pins, which select differ- ent test and operating modes. Digital Interface from GSMP to Optional EFR-Coprocessor The AD6422 provides a digital interface to an external EFR Coprocessor (DSP). This coprocessor is required to handle the Enhanced Full Rate speech codec in PCS1900 mobile radios. Baseband Processing Key Parts List Table I lists the major hardware components necessary to com- plete the GSM baseband processing subsystem. DISPLAY CONTROL KEYPAD EEPROM DATA INTERFACE VBC CLOCK POWER SUBSYSTEM 13MHz VCTCXO DAI INTERFACE GSMP SYNTHESIZER AND RADIO CONTROL DEMODULATOR MODULATOR IF AMPLIFIER RADIO POWER AMPLIFIER CAR KIT VOICEBAND ANALOG I/O RAMP DAC AGC DAC BASEBAND ANALOG I/O AUX ADC SERIAL PORTS AFC DAC DAI CONTROL VBC INTERFACE POWER CONTROL SYNTHESIZER AND RADIO CONTROL DATA INTERFACE EEPROM INTERFACE KEYPAD INTERFACE BACKLIGHT CONTROL DISPLAY CONTROL DATA ADDRESS SIM INTERFACE BACKLIGHT SRAM FLASH SIM CARD TEST INTERFACE TEST INTERFACE CLKIN ACCESSORIES CLKOUT MCLK COPROCESSOR (OPTIONAL) COPROCESSOR INTERFACE Figure 5. Chipset Interfaces Table I. List of Key Components Description Specification GSMP 1 AD6422 VBC 1 AD6421 EFR-Coprocessor 2 AD6423 FLASH 3 256K × 16, 150 ns SRAM 128K × 8, 120 ns EEPROM 4 2K × 8 Display Driver Design Specific NOTES 1These components comprise the AD20msp415 chipset. 2The EFR-Coprocessor is required only in systems requiring support of the Enhanced Full Rate speech codec. 3A size of 4 Mbits is recommended to allow storage of all GSM Layer (1, 2, 3) programs for GSM Phase 2 as well as a typical User Interface (MMI). 4Can be omitted if parameters are stored in FLASH memory. |
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