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TDMA StarTAC
Description
The DCI(U1800) is data converter interface between the DSP and the RF functions of a dual band TDMA transceiver. It incorporates the following functions:
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Dual channel forward data I and Q(RX_I & RX_Q)
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Two DACs for reverse data I and Q(TX_I & tx_Q)
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DAC for AFC
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DAC for AGC & DAC for reverse PA control
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DAC for PA bias
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Serial Synchronous Interface(SSI)
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Serial Peripheral Interface(SPI)
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Countdown timer for call processor wake-up
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Free-running Real Time Counter to keep track of the time when control processor is stopped
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Internally generates clocks from single master input
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Power saving power-down modes
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Analog wide band forward data signalling functions with SPI interface
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Analog modulator interface
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Analog discriminator interfaces
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RF Discontinuous Receive during Manchester decoding
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On chip voltage reference for transmit I and Q
TM
P8190:
DCI(U1800)
BLOCK DIAGRAM NOT NECESSARY
REFER TO PAGE B21
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