Cordless Telephone Signal Processor

U3500BM Cordless Telephone Signal Processor Description The programmable cordless phone signal processor includes all necessary low frequency parts such as microphone- and earphone amplifier, compander, preemphasis, deemphasis, scrambler, data management, power-supply management, as well as RF receiving parts such as IF converter, FM demodulator. RSSI and low noise amplifier. Several gains and mutes in transmit and receive direction are controlled by serial bus while compander, pre- and deemphasis and scrambler can be bypassed. Features RF Receiver Part D Low-noise amplifier D IF converter D FM demodulator D RSSI D Compander D Pre- and deemphasis D Scrambler D Data management D Power-supply management D Serial bus Low Frequency Part D Symmetrical input of microphone amplifier D Symmetrical output of earpiece amplifier Application: CT0 Block Diagram MIXO IFIN1 IFIN2 DACO www.DataSheet4U.com IFAMP MIXIN MIXGND Scrambler frequency LOIN Oscillator 11.15 MHz Divider RECO2 D/A LNAIN RGND LNAO VBATT MIC LNA LPF REC RECO1 MIC1 MIC2 MICO RXDAT Battery low detector C D Serial Bus LPF LPF TGAIN ADJ.2 Limiter Preem TGAIN ADJ.1 Compressor COIN TXDAT ETC Expander EXIN LOG Demodulator RGAIN ADJ LPF LPF Deem RXO Scrambler frequency VCC TXO GND CTC 14678 Figure 1. Block diagram Rev. A3, 20-May-98 1 (17) Preliminary Information U3500BM Pin Description TXO CTC COIN MICO MIC2 MIC1 GND RXO RECO2 1 2 3 4 5 6 7 8 9 28 TXDAT 27 RXDAT 26 D 25 C 6 24 DACO 23 VCC 22 LOIN 21 VBATT 20 LNAO 19 RGND 18 LNAIN 17 MIXGND 16 MIXIN 15 MIXO 96 11791 Pin 1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 RECO1 10 EXIN ETC 11 12 IFIN2 13 IFIN1 14 Figure 2. Pinning 24 25 26 27 28 Function Transmit section analog output Compressor time constant control analog output COIN Compressor analog input MICO Microphone amplifier output MIC2 Non-inverting input of microphone amplifier MIC1 Inverting input of microphone amplifier GND LF analog/ digital ground RXO Intermediate receive analog output RECO2 Symmetrical output of receive amplifier RECO1 Symmetrical output of receive amplifier EMN Expander analog input ETC Expander time constant control analog output IFIN2 Symmetrical IF amplifier input IFIN1 Symmetrical IF amplifier input MIXO Mixer output MIXIN Mixer input MIXGND IF amplifier and mixer ground LNAIN Low-noise amplifier input RGND Low-noise amplifier ground LNAO Low-noise amplifier output/ External LO input VBATT Battery supply LOIN Local oscillator input (11.15 MHz) VCC Supply-voltage output for peripherals and internal supply of digital part DACO D/A comparator output C Clock input of serial bus D Data input of serial bus RXDAT Receive data digital output TXDAT Transmit data input Symbol TXO CTC Order Information Extended Type Number U3500BM-BFL U3500BM-BFLG3 Package SO28 SO28 Remarks Taped and reeled 2 (17) Rev. A3, 20-May-98 Preliminary Information U3500BM Absolute Maximum Ratings Parameters Supply voltage Junction temperature Ambient temperature Storage temperature Power dissipation Tamb = 60°C Symbol VBatt, VCC Tj Tamb Tstg Ptot Value 5.5 +125 –25 to +75 –50 to +125 1 Unit V °C °C °C W Thermal Resistance Junction ambient Parameters SO28 Symbol RthJA Value 120 Unit K/W Electrical Characteristics Test conditions (unless otherwise specified): VBatt = VCC = 3.6 V, Tamb = +25°C Parameters Test Conditions / Pins Symbol Current consumption ERX2 ELNA ERXHF ERX1 ERXO EEA 0 0 0 0 0 0 Operating voltage range Inactive mode VBatt = 2.9 V Standby mode RX waiting for RSSI ELNA = ERXHF = 1 RX waiting for data ELNA = ERXHF = ERX1 = 1 Operating current, RX and ERX2 = ELNA = ERXHF = TX completely active ERX1 = ERXO = EEA= EDEE = GDEM = ETX = 1 Low noise amplifier (LNA) f = 41.4 MHz, input level = –50 dBm Supply current Input impedance Output impedance Gain f = 50 MHz Noise figure Bandwidth = 1 MHz 1-dB input compression point Third-order input intercept f = 41.4 MHz point f = 41.4125 MHz Input level = –60 dBm Frequency range FRF Min. Typ. Max. ETX 0 5.2 80 120 3.4 2.45 9.5 Unit Fig. EDEE 0 3.1 3.6 30 60 100 1.7 2.5 1.45 1.9 4.5 6.5 EPREE 0 mA mA mA mA mA V 0.8 160 40 20 –27 –15 1 200 80 23 4 –24 –12 1.2 240 120 26 5 mA W W dB dB dBm dBm 3 3 3 3 3 3 3 20 50 MHz 3 Rev. A3, 20-May-98 3 (17) Preliminary Information U3500BM Parameters Receiver IF mixer, f = 10.7 MHz Input resistance Input capacitance Output impedance Gain GVMIX Input compression point Third-order input intercept point Carrier breakthrough from internal LO (11.15 MHz) to IF output Carrier breakthrough from internal LO (11.15 MHz) to RF input IF amplifier: RSSI Input resistance RSSI-sensitivity Test Conditions / Pins Symbol Min. Typ. Max. Unit Fig. 2000 2.5 1200 13 –17 –9 3000 3 1500 15 4000 3.5 1800 17 W pF W Input level 7 mVrms GMIX dB dBm dBm 4 4 4 4 4 4 4 300 mVrms mVrms 4 10 VIF = 0 mVrms starting from 0 increase RSSIlevel until mean of sampled signal at DACO is 0.2 RSSI-level = CON0 1.6 2 2.5 kW 5 v VIF = 25.4 mVrms, f = 450 kHz increase RSSI level again until mean of sampled signal at DACO is 0.2. RSSI-level = CON1 RSSI-sensitivity = CON1–CON0 1 5 v RSSI-input voltage dynamic range RSSI-level number of programmable steps *) RSSI-level step size in the logarithmic region 60 65 127 dB 5 5 0.35 0.46 0.6 dB 5 *) RSSI Level Programming (Typical Values) Input Voltage VIF (m Vrms) 0 25.4 42.4 424 4240 42400 RSSI Level (Decimal) 5 8 14 54 97 111 4 (17) Rev. A3, 20-May-98 Preliminary Information U3500BM Parameters RF demodulator BSCR EDEE 1 0 Recovered audio Test Conditions / Pins Symbol Min. Typ. fIF = 450 kHz, fMOD = 1 kHz, VIF = 500 mVrms GRX0 GRX1 GRX2 GRX3 ERX1 1 1 1 0 1 GDEM = 0, D fFM = 2.5 kHz 0.4 0.8 GDEM = 1, D fFM = 5.0 kHz 0.4 0.8 Recovered audio output VBatt = 3.1 to 5.2 V –1 voltage drop AM rejection ratio 30% AM 30 35 RX audio Change of RX0 signal EDEE = 0 –0.5 0 deemphasis bypass Gain adjust range 12 15 Gain adjust step 0.8 1 Output signal vs. frequency 100 Hz –7.5 –6.5 relative to 1 kHz (0 dB) 300 Hz –2.0 –1.0 deemphasis bypassed 1800 Hz –1.3 –0.3 3200 Hz –0.8 0.2 4100 Hz Output signal vs. frequency 100 Hz –0.7 0.3 relative to 1 kHz (0 dB) 300 Hz 3.7 4.7 deemphasis enable 1800 Hz –5.7 –4.7 EDEE = 1 3200 Hz –10 –9.0 4100 Hz Total harmonic distortion D FM = 250 Hz D FM = 2.50 kHz Audio mute D FM = 2.5 kHz, ERXO = 0 65 ERX1 = 0, ERX2 = 0 Output impedance Expander EEA GEA0 GEA1 GEA2 GEA3 1 0 0 0 1 Gain reference level VEXIN = –10 dBVrms GOREC 11 13 Change of gain when BCOMP = 1 –0.5 expander is bypassed Gain tracking VEXIN = –20 dBVrms –21 –41 VEXIN = –30 dBVrms –53 VEXIN = –35 dBVrms –50 VEXIN = –40 dBVrms –60 Input impedance 9.5 Gain change vs. supply VBatt = 3.1 to 5.2 V –0.5 voltage Attack time VEXIN = step tf 16 –20 dBVrms –14 dBVrms, measure time after step, when output voltage has 0.75 times the final value Release time VEXIN = step tf 16 14 dBVrms –20 dBVrms, measure time after step, when output voltage has 1.5 times of the final value Max. ERXO 1 Unit Fig. ERX2 1 1.6 1.6 +1 Vpp Vpp dB dB 6 6 6 6 6 6 0.5 17 1.2 –5.5 0 0.7 1.2 –60 1.3 5.7 –3.7 –8.0 –66 3.5 3.5 dB dB dB dB 6 dB 6 % % dB 6 6 100 GEA4 1 15 0.5 –19 –39 –47 14.5 0.5 W dB dB 7 7 dB 7 7 7 kW dB ms ³ 7 ³ ms 7 Rev. A3, 20-May-98 5 (17) Preliminary Information U3500BM Parameters Test Conditions / Pins Symbol Earpiece amplifier BCOMP = 1, EEA = 1, VEXIN = 100 mVrms Medium gain GEA0 GEA1 GEA2 GEA3 0 0 0 0 GEA4 = 1 Minimum gain GEA0 GEA1 GEA2 GEA3 0 0 0 0 GEA4 = 0 Gain change versus VS VBatt = 3.1 to 5.2 V Gain adjust range Gain adjust step Output impedance Distortion dt Output offset voltage VEXIN = 0 mVrms Output voltage swing Increase VEXIN until distortion (RECO1/ RECO2) is 5% Maximum gain GEA0 GEA1 GEA2 GEA3 1 1 1 1 GEA4 = 1 Low Frequency Transmitter GMIC EPREE BSCR GlTX G2TX BCOMP 1 1 1 1000 1000 1 Microphone Amplifier VMIC = 10 mVrms, fIN = 1 kHz Gain High gain: GMIC = 1 Low gain: GMIC = 0 Gain change versus VS VBatt = 3.1 to 5.2 V Differential input impedance Output impedance Distortion VMIC = 10 mVrms dt Output noise VMIC = 0 Vrms high gain (psophmetrically weighted) (inputs closed across 200 W ) TX Audio VCOIN = –20 dBVrms Gain GTX (COIN, TXO) Change of gain TXO EPREE = 0 Gain between 3.2 and 5.2 V TX gain adjust range adj. 1 TX gain adjust step adj. 1 LIM gain adjust range adj. 2 LIM gain adjust range adj. 2 TX gain vs. frequency 100 Hz (preemphasis bypassed) 300 Hz relative to 1 kHz reference 1800 Hz level 0 dB 3200 Hz 4100 Hz Gain vs. frequency with 100 Hz preemphasis relative to 1 kHz 300 Hz reference level 0 dB 1800 Hz 3200 Hz 4100 Hz Total band ripple VBatt = 3.1 to 5.2 V VCOIN = –20 dBV Min. 4 Typ. 5 Max. 6 Unit dB 7 –12 –11 –10 dB 7 –0.2 0.8 31 1 10 0.2 1.2 30 2 200 dB dB dB 7 7 7 7 7 7 7 7 Fig. W –200 4.8 19 5.0 20 21 % mV Vpp dB ETX 1 31 23 –0.2 41 32 24 0 75 10 33 25 0.2 103 35 1 50 dB dB dB kW 8 8 8 8 8 8 9 9 9 9 9 9 9 W mVrmsp dB dB dB dB dB dB dB % 2.5 –0.5 –1 12 0.8 0.8 –1.3 –1.3 –0.8 –1.9 –25.9 –0.8 –6.8 3.3 6.0 16.6 5.5 0 0 15 1 15 1 –0.3 –0.3 0.2 0.9 –23.9 –7.0 –5.8 4.3 7.0 –14.6 8.5 0.5 +1 18 1.2 1.2 0.7 0.7 1.2 0.1 –21.9 –6.0 –4.8 5.3 8.0 –12.6 2 dB 9 dB 9 dB 9 6 (17) Rev. A3, 20-May-98 Preliminary Information U3500BM Parameters Limiter Output voltage Mute Test Conditions / Pins Increase VCOIN until d = 5% at TX0 then measure VTX0 ETX = 0, VCOIN = –l0 dBV attenuation at TX0 output Symbol Min. 1.05 56 7 EIX 1 G0TX GlTX0 0 9 1 0.5 –11 –21 –22 tf –30 3.5 10 14 Typ. Max. 2.0 Unit Vpp dB kW Fig. 9 9 9 Output impedance TXO Compressor BSCR EPREE G2TX0 G2TX1 G2TX2 G2TX3 1 0 0 1 0 1 Input impedance BCOMP = 1 Gain reference level G0TX VCOIN = –10 dBVrms Gain change when VCOIN = –10 dBVrms BCOMP = 1 compressor is bypassed Gain tracking VCOIN = –30 dBVrms VCOIN = –50 dBVrms VCOIN = –60 dBVrms VCOIN = �