PDF SA58646 Data sheet ( Hoja de datos )

Número de pieza	SA58646
Descripción	UHF 900MHz transceiver IC
Fabricantes	NXP Semiconductors
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No Preview Available ! SA58646 UHF 900 MHz transceiver IC Rev. 01 — 8 February 2007 Product data sheet 1. General description The SA58646 is a BiCMOS integrated circuit that performs all functions from the antenna to the microcontroller for reception and transmission for both the base station and the handset in a 902 MHz to 928 MHz full-duplex radio. The SA58646 may be used in a UHF push-to-talk walkie-talkie or in a UHF to 900 MHz data transceiver. The SA58646 is a pin-compatible derivative of the UAA3515 with advanced features. This IC integrates most of the functions required for a half-duplex or full-duplex radio in a single integrated circuit. Additionally, the programmability implemented reduces signiﬁcantly external components count, board space requirements and external adjustments. 2. Features I RF RX (single frequency conversion FM receiver): N Integrated LNA N Image reject mixer N FM detector at 10.7 MHz including an IF limiter, a wide band PLL demodulator, an output ampliﬁer and a RSSI output N Carrier detection with programmable threshold N Programmable data ampliﬁer (slicer) phase I Synthesizer: N Crystal reference oscillator with integrated tuning capacitor N Reference frequency divider N Narrow band RX PLL including RX VCO with integrated varicaps N Narrow band TX PLL including TX VCO with integrated varicaps N VCO external inductors can be done with printed transmission lines on the PCB which offers substantial savings N Programmable clock divider with output buffer to drive a microcontroller I Baseband RX section: N Programmable RX gain (enable phone volume control) N Expander with output noise level control N Earpiece ampliﬁer with volume control feature N Data ampliﬁer I Baseband TX section: N Microphone ampliﬁer N Compressor with automatic level control and hard limiter N Programmable TX gain 1 page NXP Semiconductors SA58646 UHF 900 MHz transceiver IC SA58646_1 Product data sheet Table 2. Pin description …continued Symbol Pin Description VCC(PS) TXPD 12 prescaler supply 13 TX phase detector output TXLF 14 TX loop ﬁlter output GND(PA) 15 PA ground PAO 16 PA output GND(PA) 17 PA ground MODI 18 summator ampliﬁer input MODO 19 summator ampliﬁer output GNDVTX 20 VCO TX ground VTX 21 VCO TX voltage output TXLOX 22 VCO TX coil connection x TXLOY 23 VCO TX coil connection y VCC(ATX) CCAP 24 audio TX supply 25 external capacitor connection for compressor TXO 26 audio TX output MICI 27 microphone ampliﬁer input MICO 28 microphone ampliﬁer output CMPI 29 compressor input VB 30 voltage reference capacitor connection GND(ATX) 31 audio TX ground XTALI 32 crystal input XTALO 33 crystal output CDLBD 34 carrier detector or low battery detector output (out-of-lock synthesizer RX and/or TX in Test mode) CLKO 35 clock output EN 36 serial interface enable input CLK 37 serial interface clock input DATA 38 serial interface data input DATAO 39 data ampliﬁer output DATAI 40 data ampliﬁer input GND(ARX) 41 audio RX ground EARO 42 earpiece ampliﬁer output EARI 43 earpiece ampliﬁer input VCC(ARX) ECAP 44 audio RX supply 45 external capacitor connection for expander RXAI 46 audio RX input LPFD 47 demodulator loop ﬁlter DETO 48 inverting demodulator ampliﬁer output PLLO 49 demodulator ampliﬁer negative input LIMI 50 limiter input GND(IF) 51 IF ground Rev. 01 — 8 February 2007 © NXP B.V. 2007. All rights reserved. 5 of 42 5 Page NXP Semiconductors SA58646 UHF 900 MHz transceiver IC Example: RF RX f = 903 MHz, VCO RX f = 892.3 MHz, IF f = 10.7 MHz, VCO TX f = 925.6 MHz and the internal comparison frequency f = 20 kHz (fxtal = 10.24 MHz): REF_DIV[9:0] = 512 (10 0000 0000), For RX: M = 892.3 × 106 / 20 × 103 = 44615, C = 697 (10 1011 1001), R = 7 (00 0111), For TX: M = 925.6 × 106 / 20 × 103 = 46280, C = 723 (10 1101 0011), R = 8 (00 1000). VCOs and varicaps are integrated. The total equivalent inductance is comprised of the bonding wires, lead frame of the package and external inductors. External inductors can be done with printed transmission lines on the PCB, which allows substantial savings. An on-chip selectable voltage doubler is provided to enable a larger tuning range of the VCOs. The phase detectors have current drive type outputs. Current can be chosen between 400 µA and 800 µA. XTALO XTALI XTAL_H XTAL XTAL_TUN [3:0] CLK_DIV [2:0] CLKO CLOCK DIVIDER CLKO VCP GNDVCP VOLTAGE DOUBLER 10-BIT REFERENCE DIVIDER REF_DIV [9:0] DOUBLER VREG VB VOLTAGE REGULATOR REG_ADJ [2:0] REG Fig 5. Synthesizer part RX_CP RX PHASE DETECTOR RXPD RX_MDIV [9:0] mixer RX_PRE [5:0] VCO RX 10-BIT 6-BIT MAIN RX PRESCALER DIVIDER RX VREG RX TX PHASE DETECTOR TX_CP TX_MDIV [9:0] TX_PRE [5:0] VCO TX 10-BIT 6-BIT MAIN TX PRESCALER DIVIDER TX VREG TX PA MODO RXLOX RXLF RXLOY VRX TXPD TXLOX TXLF TXLOY VTX 001aaf620 SA58646_1 Product data sheet Rev. 01 — 8 February 2007 © NXP B.V. 2007. All rights reserved. 11 of 42 11 Page

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