NXP UHF to 900-MHz transceiver SA58646

Single-chip analog transceiver for UHF to 900 MHz

Housed in a small LQFP package (10 x 10 mm), this highly integrated BiCMOS transceiver provides complete Rx/Tx functionality in basestations and handsets. It is ideally suited for use in full-duplex , push-to-talk walkie-talkies, data transceivers, and full-duplex cordless phones.

Key features The NXP UHF 900-MHz transceiver SA58646 performs all the 4 Complete RF Rx functionality (single-frequency conversion reception (Rx) and transmission (Tx) functions for a basestation RF receiver) or handset, from the to the microcontroller interface. 4 Complete RF Tx functionality Programmable features reduce the number of external 4 Integrated synthesizer components, so the design uses less space and there are 4 Baseband Rx section with volume control fewer external adjustments. 4 Baseband Tx section 4 3-wire microcontroller interface Applications for the SA58646 include Family Services 4 Voltage regulator to supply internal PLLs (FRS) UHF push-to-talk walkie-talkies, full-duplex cordless 4 Selectable voltage doubler phones in the 902-to-928-MHz range, and data transceivers in 4 Programmable timer for low-battery detection multiplexed the UHF-to-900-MHz or 433-MHz ranges. with RSSI carrier detect 4 LQFP64 package (10 x 10 x 1.4 mm) To save space in portable applications, the device is housed in a plastic low-profile quad flat package (LQFP) with 64 leads Applications that measures only 10 x 10 x 1.4 mm. The minimum supply 4 Full-duplex radios (902 to 928 MHz) voltage is a VCC of 2.9 V, which limits the voltage swing on 4 Data transceivers (UHF to 900 MHz) both charge pumps to approximately 2.3 V. 4 Push-to-talk walkie-talkies (FRS UHF) 4 eMetering Three operating modes reduce current consumption in 4 Handheld medical monitoring devices handset applications. In Active (talk) mode, all blocks are powered. In Rx mode, all circuitry in the RF receiver section 10.7 MHz IF are active. In Inactive mode, all circuitry except the ceramic filters 462 MHz to 467 MHz serial interface is powered down. RF Rx IF amps Limiter amps filter LNA + PLL FM Post quad mixer detector detection The FM receiver section has an integrated LNA and filter

SA58643DP an image reject mixer, so there’s no need for an Expander/ Tx/Rx switch RVCO Dual synthesizer earphone external RF preselector filter. The transmit VCO is amp SA58631TK Mute frequency modulated by speech or data. TVCO Reference oscillator RF Tx LPA Compressor/ SPI PA filter mic amp interface Volume in the earpiece amplifier is controlled via SA58646BD

SPI- RSSI software or hardware in the baseband Rx section, Push-to-talk microphone SPI Comparator which has a mute function and an expander. in Comparator Tx/Rx control out Tx/Rx RSSI squelch The baseband Rx section also has a microphone Control output Low power CPU User interface LPC916 8-bit amplifier, a compressor with automatic level control internal Flash ADC I2C LCD Keypad driver I2C-bus and a hard limiter, as well as a Tx gain. Each Tx and UART Rx audio-signal path has a programmable gain block. Family radio services UHF walkie-talkie application block diagram

For communication with a microcontroller, there is 10.7 MHz IF 3-wire serial interface. The interface sets the value ceramic filters 902 MHz to 928 MHz, 868 MHz RF Rx of the Rx gain with 32 linear steps of 0.5 dB each. IF amps Limiter amps filter LNA + PLL FM Post The interface is also used to program the thresholds quad mixer detector detection of two detect functions, low-battery detect, which filter SA58643DP Tx/Rx switch Data Data output monitors battery status, and carrier detect, which RVCO Dual synthesizer amp indicates whether a carrier is present on a given channel. The two detect functions can be time- TVCO Reference oscillator RF Tx LPA Compressor/ SPI PA multiplexed. filter data amp interface SA58646BD

SPI-bus RSSI For more information visit www.nxp.com/standardics Tx data input SPI Comparator RSSI squelch in output Tx data Comparator Tx/Rx control out Tx/Rx Control Low power CPU User interface Rx data in LPC916 8-bit internal Flash ADC VCCLNA MIXO VCCMIX VCCBLO GNDVRX RXLOY RXLOX VCCVRX IFA1I IFA1O VCCIF IFA2I IFA2O GNDIF LIMI PLLO I2C LCD Serial program Keypad 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 driver I2C-bus interface UART

GNDMIX 1 48 DETO RFIX 2 47 LPFD RFIY 3 46 RXAI 902-928 MHz / 868 MHz data transceiver application block diagram GNDLNA 4 45 ECAP RXLF 5 44 VCCARX RXPD 6 43 EARI RSSI 7 42 EARO VREG 8 41 GNDARX SA58646BD GNDD 9 40 DATAI Ordering information VCCCP 10 39 DATAO GNDCP 11 38 DATA VCCPS 12 37 CLK Type number Temp range Package Dimensions Version TXPD 13 36 EN SA58646BD -20 to +80 °C 64-pin LQFP 10 x 10 x 1.4 mm SOT314-2 TXLF 14 35 CLKO GNDPA 15 34 CDLBD PAO 16 33 XTALO

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 002aac229 VB TXO MICI CMPI XTALI CCAP MICO MODI TXLOY TXLOX MODO GNDPA VCCVTX VCCATX GNDVTX GNDATX

SA58646 pin configuration

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© 2006 NXP N.V. All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The Date of release: November 2006 information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and Document order number: 9397 750 15689 may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof Printed in the USA does not convey nor imply any license under patent- or other industrial or intellectual property rights.