RX3140 Low Power IF Receiver IC Princeton Technology Corp. reserves the right to change the product described in this datasheet. All information contained in this datasheet is subject to change without prior notice. Princeton Technology Corp. assumes no responsibility for the use of any circuits shown in this datasheet. Description The RX3140 is a low power IF receiver IC which is fully compatible with the Toshiba TA31142 IC and is suitable for use as the second IF downconverter in double-conversion paging systems. The RX3140 is well-suited for POCSAG paging applications and incorporates a 2-level FSK demodulator consisting of a quadrature FM demodulator, on-chip bit-rate filter, and 1-bit comparator. An on-chip 1 V regulator is provided for convenient biasing of off-chip circuitry. Features Extremely low power operation with power-down feature Built-in crystal oscillator for mixer local oscillator Mixer input frequency: 10 — 50 MHz Quadrature detector On-chip bit-rate filter Audio output 1-bit comparator with open collector output 1 V regulator 1.1 V low battery alarm TSSOP-20 package (0.65 mm pitch) Applications Pager Wireless mouse Two-way car alarm system Block Diagram 20 MIX IN 19 VSS 18 REG OUT 17 REG CON 1.0 V REGULATOR 16 15 ALM FSK OUT 14 CHA RGE LOW 1-BIT BATTERY COMPARATOR ALARM 13 12 BS LPF OUT 11 LPF IN CHARGE/ DISCHARGE CIRCUIT MIXER DETECTOR QUAD OSCILLATOR IFAMP 1 OSC IN 2 OSC OUT 3 MIX OUT 4 VCC 5 IFIN 6 DEC 7 FSK REF 8 IF OUT Page 1 For:Natertech AF OUT QUAD 9 10 April 2003 RX3140 Package and Pin Assignment: 20L, TSSOP OSCIN MIXIN MIXOUT VCC IFIN DEC Date Code FSKREF IFOUT QUAD AFOUT Dimensions in mm Symbols HiMARK RX3140 OSCOUT VSS REGOUT REGCON ALM FSKOUT CHARGE BS LPFOUT LPFIN Dimensions in inch MIN. NOM. MAX. MIN. NOM. MAX. A --- --- 1.20 --- --- 0.048 A1 0.05 --- 0.15 0.002 --- 0.006 A2 0.80 1.00 1.05 0.031 0.039 0.041 b 0.19 --- 0.30 0.007 --- 0.012 C 0.09 --- 0.20 0.004 --- 0.008 D 6.40 6.50 6.60 0.252 0.256 0.260 E --- 6.40 --- --- 0.252 --- E1 4.30 4.40 4.50 0.169 0.173 0.177 e --- 0.65 --- --- 0.026 --- L 0.45 0.60 0.75 0.018 0.024 0.030 y --- --- 0.10 --- --- 0.004 θ 0° --- 8° 0° --- 8° Page 2 For:Natertech April 2003 RX3140 Pin Descriptions Number Name I/O Description 1 OSCIN I Oscillator input (base) 2 OSCOUT O Oscillator output (emitter) 3 MIXOUT O Mixer output (2 KΩ output impedance) 4 VCC POWER 5 IFIN I IF amplifier input (2 KΩ input impedance) 6 DEC I IF amplifier de-coupling capacitor connection 7 FSKREF I 1-bit comparator reference input (requires external capacitor) 8 IFOUT O IF amplifier output 9 QUAD I Quadrature FM demodulator input 10 AFOUT O Quadrature FM demodulator output 11 LPFIN I LPF operational amplifier input 12 LPFOUT O LPF operational amplifier output 13 BS I Two-state logic input to control receiver power up/down. (BS = high = normal operation; BS = low = stand-by mode) 14 CHARGE I Two-state logic input to control charge-discharge circuit. (CHARGE = high = fast charge; CHARGE = low = slow charge) 15 FSKOUT O Open collector NRZ comparator output (requires pull-up resistor) 16 ALM O Open collector low battery alarm output (requires pull-up resistor) 17 REGCON O 1.0 V regulator control output for connection to external PNP base 18 REGOUT I 1.0 V regulator input for connection to external PNP collector 19 VSS GND 20 MIXIN I Nominal 1.4 V supply Ground Mixer input (5 KΩ input impedance) Page 3 For:Natertech April 2003 RX3140 Absolute Maximum Ratings VSS = 0 V Parameter Symbol Rating Unit Supply voltage VCC VSS – 0.3 to VSS + 3.5 V Operating temperature range TOPR –30 to 85 °C Storage temperature range TSTG –55 to 150 °C Soldering temperature range TSLD 255 °C Soldering time range tSLD 10 s Recommended Operating Conditions VSS = 0 V Parameter Supply voltage range Symbol VCC MIXIN input frequency fMIXIN Operating temperature TA Value Unit min. typ. max. 1.1 1.35 1.6 V 50 MHz 60 °C –10 25 Page 4 For:Natertech April 2003 RX3140 Electrical Characteristics (VCC = 1.4 V, VSS = 0 V, TA = 25 °C, BS = high unless otherwise noted) Parameter Symbol Condition Value min. ICC,total Quiescent current consumption Unit typ. max. 1.1 1.6 mA 5 µA 16 dB ICC,standby VBS = 0 V Mixer conversion gain GC measured after 455 KHz ceramic filter Mixer input intermodulation intercept point IIP3 –10 dBm Mixer input resistance Rin,MIX 5 KΩ Mixer output resistance Rout,MIX 2 KΩ IF amplifier input resistance Rin,IF 2 KΩ S/N ratio 1 SN1 –53 dBm at MIXIN 63 dB S/N ratio 2 SN2 –53 dBm at IFIN 63 dB S/N ratio 3 SN3 –91 dBm at IFIN 25 dB Demodulation output level VOD –53 dBm at IFIN 45 mVrms AM rejection ratio AMR –53 dBm at IFIN, AM=30 % 50 dB Standby current consumption FSK output duty ratio Low battery alarm threshold voltage Regulator output voltage Charging/discharging current 9 12.5 DR 40 50 60 % VALM 1.05 1.1 1.15 V VREGOUT 430 Ω load resistor 0.95 1.0 1.05 V ICH VFSKREF = 0 V, VLPFOUT = 0.18 V 35 70 110 µA ALM logic HIGH output current IOH,ALM 2 µA ALM logic LOW output voltage VOL,ALM 0.4 V FSKOUT logic HIGH output current IOH,FSK- 2 µA FSKOUT logic LOW output voltage VOL,FSK- 0.4 V OUT OUT Page 5 For:Natertech April 2003 RX3140 Functional Description The RX3140 IF receiver IC incorporates a mixer, crystal-based local oscillator, IF amplifier, quadrature FM demodulator, bit-rate filter, and 1-bit comparator and is capable of demodulating 2-level FSK input signals. In addition, 1.0 V regulator and 1.1 V low battery alarm functions are provided. Power-down Function The entire receiver IC may be powered up and down through the control of the BS input (pin 13). During power down operation, the quiescent current consumption of the IC drops to approximately 0 µA. The high input impedance of the BS pin allows for direct interfacing with the CMOS output of an off-chip microcontroller. Charge/Discharge Circuitry The function of the charge/discharge circuitry is for both fast and slow charging/discharging of the capacitor used for storing the voltage reference level of the FSKREF pin. The CHARGE input (pin 14) should be enabled (CHARGE = high = fast charge) immediately after transition of the receiver IC from power-down to normal operation in order to reduce the charging/discharging time for coarse adjustment of the FSKREF voltage to the appropriate dc level (i.e. dc level of the LPFOUT pin) and consequently to minimize the erroneous output of the 1-bit comparator. During actual data reception, the CHARGE pin should be set to low (CHARGE = low = slow charge) for fine adjustment of the FSKREF voltage. 1-bit Comparator The integrated 1-bit comparator operates as a data slicer and “squares up” the bit-rate filtered output from the quadrature demodulator. The decision threshold voltage level for the 1-bit comparator is stored on an external capacitor connected to the FSKREF pin. Regulator The on-chip 1.0 V regulator requires a suitable off-chip PNP transistor to achieve regulation. The external PNP transistor should have an hFE > 200 for V CE ≥ 0.1 V . Low Battery Alarm The low battery alarm output, ALM, is normally low, but rises to 1.1 V (≈ VCC) when the VCC voltage falls below approximately 1.1 V. Page 6 For:Natertech April 2003 RX3140 Typical Performance Characteristics 2 0 1.8 1.6 -5 1.4 VOD (dB) ICC (mA) 1.2 1 0.8 VCC=1.4 V T=300 K CHARGE=H 0.6 0.4 -10 VCC=1.4 V T=300 K IFIN=-53 dBm fmod=600 Hz ∆f=4 KHz 0 dB=158 mVpk-pk -15 0.2 0 0 1 2 -20 440 3 VCC (V) 1.4 0.4 1.2 0.35 450 455 460 IFIN (KHz) 465 470 0.3 LPFIN (V) 1 0.8 ALM (V) 445 0.6 0.4 0.25 0.2 VCC=1.4 V T=300 K IF=-53 dBm fmod=600 Hz ∆f=4 KHz 0.15 0.1 0.2 0.05 0 440 0 0 0.5 1 1.5 2 2.5 3 445 450 455 460 465 470 IFIN (KHz) VCC (V) 80 60 I(CHARGE) ( µ A) 40 20 0 -20 VCC=1.4 V T=300 K -40 -60 -80 0 0.1 0.2 0.3 0.4 0.5 FSKREF (V) Page 7 For:Natertech April 2003 RX3140 Test Circuit 0.01 µF 20 19 MIX IN VSS 18 REG OUT 17 REG CON 16 ALM 15 FSK OUT 14 LOW 1-BIT BATTERY COMPARATOR ALARM 1.0 V REGULATOR CHA RGE 13 12 BS LPF OUT 11 LPF IN 330 pF 68 KΩ 68 KΩ 560 pF 68 KΩ VOD 100 KΩ 100 KΩ 2SA1015GR 430 Ω 2.2 µF 1 nF VFSKOUT VALM VCC 51 Ω VREGOUT CHARGE/ DISCHARGE CIRCUIT MIXER QUAD DETECTOR OSCILLATOR IFAMP 39 pF 10 µF 22 KΩ 0.1 µF 56 pF 5 6 DEC 7 FSK REF 8 IF OUT 22 pF 9 QUAD GC MURATA CFVM455E Page 8 For:Natertech AF OUT 10 3.3 KΩ 4 IFIN 10 µF 3 VCC 10 µF 2 MIX OUT 0.1 µF 1 OSC OUT VCC VCC OSC IN VCC April 2003 RX3140 Application Circuit LNA 1st mixer OSCIN 1st IF amplifier REGOUT VCC REGCON DEC FSKREF IFOUT QUAD AFOUT HiMARK RX3140 VSS MIXOUT IFIN Frequency multiplier (×2,3) MIXIN OSCOUT ALM FSKOUT CHARGE BS LPFOUT LPFIN 1st LO XIN TEST XOUT DB DO VSS FIN VDD1 HiMARK FS8107E VDD2 RAM ROM CPU Decoder NC OPR LE DATA CLK LD NC LCD driver Driver LCD DC/DC converter Page 9 For:Natertech April 2003