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NXP Semiconductors Electronic Components Datasheet

PCF7900 Datasheet

Fractional-N Transmitter IC

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PCF7900
PCH7900
Fractional-N Transmitter IC (FraNTIC)
Product Specification
Confidential
2007 Dec 13


NXP Semiconductors Electronic Components Datasheet

PCF7900 Datasheet

Fractional-N Transmitter IC

No Preview Available !

NXP Semiconductors
Fractional-N Transmitter IC (FraNTIC)
Product Specification
PCF7900 / PCH7900
CONTENTS
1 GENERAL INFORMATION.......................................................................................................................................................... 4
1.1 Features .............................................................................................................................................................................. 4
1.2 General Description ............................................................................................................................................................ 4
2 ORDERING INFORMATION ....................................................................................................................................................... 4
3 PACKAGE OUTLINE ................................................................................................................................................................... 5
4 PNNING INFORMATION............................................................................................................................................................. 7
4.1 Pin Assignment ................................................................................................................................................................... 7
4.2 Pin Description .................................................................................................................................................................... 7
5 FUNCTIONAL DESCRIPTION .................................................................................................................................................... 9
5.1 Functional Block Diagram ................................................................................................................................................... 9
5.2 Functional Blocks Overview ................................................................................................................................................ 9
5.2.1 Power Management, Voltage Regulator .................................................................................................................. 9
5.2.2 Interface and Control Logic.................................................................................................................................... 10
5.2.2.1 configurable 3 or 4 wire interface ............................................................................................................ 10
5.2.3 Reference Oscillator .............................................................................................................................................. 11
5.2.4 Baud Rate Generator............................................................................................................................................. 11
5.2.5 Power Amplifier...................................................................................................................................................... 11
5.3 Transmitter operating modes ............................................................................................................................................ 12
5.4 Reference Clock generation.............................................................................................................................................. 13
5.5 Power Amplifier Control and ASK Modulation ................................................................................................................... 15
5.5.1 PAM0,PAM1 Power Amplifier Modes ................................................................................................................... 15
5.5.2 ACON Power Amplifier Amplitude Control ............................................................................................................ 15
5.5.3 ASK Settings.......................................................................................................................................................... 15
5.5.4 SASK, Soft ASK mode........................................................................................................................................... 16
5.5.5 CASC, cascode control signal ............................................................................................................................... 17
5.6 Voltage regulation and power fail detection....................................................................................................................... 17
5.6.1 ENRAD, enable regulator adaptive mode .............................................................................................................. 17
5.6.2 ENPF, enable power fail detection......................................................................................................................... 17
5.7 Frequency Control and FSK Operation ............................................................................................................................. 18
5.7.1 Frequency Control registers................................................................................................................................... 18
5.7.2 PLL operation frequency fVCO................................................................................................................................. 18
5.7.3 PLL frequency deviation (FSK) .............................................................................................................................. 18
5.7.4 oscillator and feedback divider settings ................................................................................................................. 19
5.7.5 FSK mode selection............................................................................................................................................... 19
Example: ............................................................................................................................................... 19
5.8 Baudrate Generation ......................................................................................................................................................... 20
5.8.1 Baud-rate setting ................................................................................................................................................... 20
5.8.2 Clock generation / selection................................................................................................................................... 21
5.8.3 Prescaler................................................................................................................................................................ 21
5.8.4 After-scaler ............................................................................................................................................................ 21
5.8.5 TxData Output ....................................................................................................................................................... 21
5.9 General SPI Information.................................................................................................................................................... 22
5.9.1 SFR summary........................................................................................................................................................ 22
5.9.2 General SFR access information ........................................................................................................................... 23
5.9.3 Transmit data command ........................................................................................................................................ 25
5.9.3.1 Description of the configuration bits ........................................................................................................ 25
5.10 Antenna tuning ................................................................................................................................................................ 28
5.10.1 Antenna tuning configuration ............................................................................................................................... 28
5.10.2 Antenna Tune command...................................................................................................................................... 30
5.11 Test Circuit ...................................................................................................................................................................... 31
2007 Dec 13 2 Confidential


Part Number PCF7900
Description Fractional-N Transmitter IC
Maker NXP
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PCF7900 Datasheet PDF






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