the wireless IC company RX3930 Low Power ISM-band FM/FSK Receiver IC Advance Information HiMARK Technology, Inc. reserves the right to change the product described in this datasheet. All information contained in this datasheet is subject to change without prior notice. HiMARK Technology, Inc. assumes no responsibility for the use of any circuits shown in this datasheet. Description The RX3930 is a low power 433/868/915 MHz FM/FSK receiver IC which is suitable for use in the North American 915 MHz and the European 433 and 868 MHz ISM bands. Features ! Integrated VCO with fixed ÷ 64 prescaler, phase/frequency detector, and reference oscillator forming complete phase-locked loop ! User selectable FM or FSK output ! RSSI output with 70 dB dynamic range ! Receiver enable pin for power saving ! TQFP-32 package (5mm x 5mm) Applications ! Wireless mouse ! Wireless amplifier/ speaker/ earphone/ microphone ! Wireless car alarm system Block Diagram OSC RXEN IN 32 VCC1 1 31 OSC OUT DO 30 29 VSS4 VCC2 RES 28 27 26 RES 25 24 QUAD OSC VCO 23 IF2 RXIN 2 PFD VSS1 3 OUT ÷ 64 22 FM LNA OUT LNA OUT 4 BIAS COMPARATOR/ AUDIO AMP 21 RSSI VSS2 5 20 MUTE MIXER MIX 6 IN RSSI 19 VCC3 LIMITER IFAMP VSS3 7 DEMOD 18 IF2 DEC 17 IF2 DEC MIX 8 OUT 9 10 11 12 13 IFIN IFIN IF1 DEC IF1 DEC IF1 VREF VSS5 IF2 OUT IF IN Page 1 14 15 16 May 2001 Advance Information RX3930 the wireless IC company Package and Pin Assignment: TQFP-32 IF2DEC IF2DEC VCC3 MUTE RSSI FMOUT IF2OUT QUAD 2 4 2 3 2 2 2 1 2 0 1 9 1 8 1 7 RES 25 16 RES VCC2 26 15 27 14 VSS4 DO OSCOUT 28 13 29 12 30 11 OSCIN RXEN 31 10 32 9 1 2 3 4 5 6 7 IF2IN VSS5 VREFIF IF1OUT IF1DEC IF1DEC IFIN IFIN 8 MIXOUT VSS3 MIXIN VSS2 LNAOUT VSS1 RXIN VCC1 Dimensions in mm Dimensions in inch Symbols min. nom. max. min. nom. max. A — — 1.20 — — 0.047 A1 0.05 — 0.15 0.002 — 0.006 A2 0.95 1.00 1.05 0.037 0.039 0.041 b 0.17 0.22 0.27 0.007 0.009 0.011 C 0.09 — 0.20 0.003 — 0.008 D1 4.90 5.00 5.10 0.193 0.197 0.201 D 6.80 7.00 7.20 0.267 0.275 0.283 E1 4.90 5.00 5.10 0.193 0.197 0.201 E 6.80 7.00 7.20 0.267 0.275 0.283 e — 0.50(typ) — — 0.02(typ) — L 0.45 0.60 0.75 0.018 0.024 0.029 L1 — 1.00(ref.) — — 0.039(ref.) — θ1 0° 3.5° 7° 0° 3.5° 8° ccc — — 0.008 — — 0.003 Page 2 May 2001 Advance Information RX3930 the wireless IC company Pin Descriptions Number Name I/O Description 1 VCC1 POWER 2 RXIN I 3 VSS1 GND 4 LNAOUT O 5 VSS2 GND 6 MIXIN I RF input to RF Mixer 7 VSS3 GND Ground for RF Mixer 8 MIXOUT O IF output from RF Mixer 9 IFIN I IF input (required 10nF DC blocking capacitor) 10 IFIN I Same as pin 9 except non-inverting node amplifier input 11 IF1DEC I/O DC feedback for 40dB limiting amplifier (required 100nF bypass capacitor) 12 IF1DEC I/O See pin 11 13 IF1OUT O IF output from the 40 dB limiting amplifier 14 VREFIF O DC voltage reference for the IF limiting amplifier (required 0.1 µF capacitor) 15 VSS5 GND 16 IF2 IN I Inverting input to the 60dB limiting amplifier (required 10nF DC blocking capacitor) 17 IF2DEC I/O DC feedback node for the 60dB limiting amplifier (required 100nF bypass capacitor) 18 IF2DEC I/O See pin 17 19 VCC3 POWER 20 MUTE I Select FM, FSK, or mute at the FM OUT pin. (to Ground: FSK OUTPUT; floating: FM OUTPUT; to Vcc: muting) 21 RSSI O Proportional DC voltage (0.5V~2.5V) output 22 FMOUT O Demodulated output 23 IF2OUT O IF output from the 60dB limiting strip 24 QUAD I FM demodulator input (not AC coupled) 25 RES I/O Supply DC voltage to VCO 26 RES I/O See pin 25 27 VCC2 POWER Supply DC bias to the VCO, prescaler, and PLL 28 VSS4 GND Ground shared by the VCO, prescaler, and PLL 29 DO I/O Supply DC bias for RF amplifier RF amplifier input Ground for RF amplifier LNA output Ground for 40dB IF limiting amplifier Ground for 60dB IF limiting amplifier Supply DC bias to the 60dB IF limiting amplifier Output of the charge pump, and input to the VCO Page 3 May 2001 Advance Information RX3930 the wireless IC company Number Name I/O Description 30 OSCOUT I/O Connected to the reference oscillator transistor base 31 OSCIN I/O Connected to the emitter of the reference oscillator transistor 32 RXEN I Power up or down the RX3930. (logic high powers up the receiver and PLL; logic low powers down circuit to stand by mode) Page 4 May 2001 Advance Information RX3930 the wireless IC company Absolute Maximum Ratings VSS = 0 V Parameter Symbol Rating Unit Supply voltage VCC1 VCC2 VSS – 0.5 to VSS + 5.5 V Operating temperature range TOPR –40 to 85 °C Storage temperature range TSTG –40 to 150 °C Soldering temperature range TSLD 255 °C Soldering time range tSLD 10 s Recommended Operating Conditions VSS = 0 V Value Parameter Supply voltage range Operating temperature Symbol Unit min. typ. max. VCC1 2.7 3.6 5.0 V VCC2 2.7 3.6 5.0 V VCC3 2.7 3.6 5.0 V TA –10 25 60 °C Page 5 May 2001 Advance Information RX3930 the wireless IC company Receiver Characteristics (VCC1, VCC2, VCC3 = 2.7 to 5.0 V, VSS = 0 V, RXEN = high, TA = –10 to 60 °C unless otherwise noted) Value Parameter Symbol Condition Unit min. Input RF frequency range typ. 300 Sensitivity Psens LO leakage αLO BWIF = 150 KHz, fRF = 915 MHz, SNR = 8 dB max. 1000 MHz –97 dBm –55 dBm Electrical Characteristics (VCC1, VCC2, VCC3 = 2.7 to 5.0 V, VSS = 0 V, RXEN = high, TA = –10 to 60 °C, fRF = 915 MHz unless otherwise noted) Value Parameter Symbol Condition Unit min. typ. max. Power supply VCC1 supply voltage VCC1 2.7 3.6 5.0 V VCC2 supply voltage VCC2 2.7 3.6 5.0 V VCC3 supply voltage VCC3 2.7 3.6 5.0 V Total dc current (normal operation) Total dc current (stand-by mode) IDC 10 Istandby RXEN = low Power gain GLNA Matched to 50 Ω Noise figure Input third-order intermodulation intercept point mA 1 µA LNA 17 dB NFLNA 3.8 dB IIP3LNA –8 dBm 7 dB Mixer Conversion power gain GC Matched to 50 Ω Noise figure (SSB) NFMIX 17 dB Input third-order intermodulation intercept point IIP3MIX –15.5 dBm VCO Frequency range External varactor Page 6 300 1000 MHz May 2001 Advance Information RX3930 the wireless IC company Value Parameter Symbol Condition Unit min. typ. max. PLL N-divider ratio 64 Reference frequency fREF Charge pump current ICP Lock time τlock –40 PLL’s lock time set by bandwidth of external loop filter 17 MHz 40 µA 10 ms IF amplifier Frequency range 0.1 10.7 25 MHz Input impedance Zin,IF 330 Ω Output impedance Zout,IF 330 Ω Limiter Frequency range 0.1 10.7 25 MHz Input impedance Zin,IF 330 Ω Output impedance Zout,IF 330 Ω 70 dB RSSI RSSI dynamic range Rload = 51 KΩ RSSI dc output range 0.5 2.5 V FM/FSK Demodulator Demodulated output level (audio) VOD mVrms 70 FSK output duty ratio 40 Page 7 50 60 % May 2001 Advance Information RX3930 the wireless IC company Application Circuit (906 MHz) *:Alpha smv1233-11 47N 3.3N 10K 10 2.7K VCC Ctrim 2.7P 100P 14.31818MHz * 47P 10N 3.9N RXEN 3.9N 100P 32 RXEN OSC IN 47P 10N 31 30 29 OSC OUT DO 28 27 26 VSS4 VCC2 RES 1 VCC1 VCC 12N RXIN 22P RES QUAD 23 3 VSS1 FM OUT 22 4 OUT RSSI 21 5 VSS2 MUTE 20 MIX IN VCC3 19 100P 47P 10N 6 IF2 DEC 7 VSS3 10uA VCC 47P MIX IF2 8 OUT 10N IFIN IFIN IF1 DEC IF1 DEC 9 10 11 12 10N 10N 10N DEC VREF IF1 IF2 OUT IF VSS5 IN 13 14 15 10N 2.2P IF2 OUT LNA ** 24 2 RXIN 8.2N VCC **: 10.7MHz discriminator CDF-107B 15K 25 18 FMOUT RSSI 10P MUTE 51K VCC 10N 47P 10N 17 10N 16 10N 10N LT 10.7MS3 f 0 = 10.7MHz BW = 180KHz Page 8 May 2001