WL600C 2.4 - 2.5GHz RF and IF Circuit Preliminary Information DS4581 2.1 August 1997 The WL600C is a 2.4-2.5GHz RF transmitter and receiver chip for use in digital radio, and operates from a supply voltage of 2.7 - 3.6V. It is designed to work with the Mitel Semiconductor WL800 frequency synthesiser and the WL102 WLAN controller chip which together make up the DE6038 frequency hopping Wireless Local Area Network (WLAN) transceiver. The receiver circuit contains a low noise amplifier, image rejecting mixer, IF limiting strip with RSSI and a quadrature demodulator. There is also a power amplifier driver stage and ramp control facility for use in transmit. PIN 1 PIN 48 PIN 1 IDENT FEATURES ■ Part of DE6038 chipset (WL800, WL102) ■ High level of integration ■ Low noise figure ■ Low power consumption ■ High data rates with comparator for 2 level FSK LQFP48 ■ Minimal external components ■ 48 lead LQFP package Fig.1 Pin connections - top view ABSOLUTE MAXIMUM RATINGS Supply voltage Vcc Transmit/Receive and standby input 4V -0.5 to Vcc +0.5V Current consumption TBD Junction temperature Tj 150° ESD protection 2KV ORDERING INFORMATION WL600C/KG/GP1R RELATED DOCUMENTS Datasheets WL800/102 DE6038 Pin Description Pin Description 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 QUAD+ QUADGND_IF DEMOD_OUT+ DEMOD_OUTRSSI CLAMP_SET CCA_THRESHOLD VCC_IFSTRIP DECOUPLE_LOGDECOUPLE_LOG+ IF_IN+ IF_INCCAB GND_IF BUFFER_IN+ BUFFER_INVCC_DATA RXD RXDB GND_RF IF_OUTIF_OUT+ GND_PADDLE 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 VCC_RF GND_RF VCC_LNA GND_RF RF_IN LNA_DEGEN LNA_DEGEN DRIVE VCC_PA GND_RF RAMP_CAP PA_ON STDBYB TX/RXB GND_LO LO_IN VCC_LO DATA_IN+ DATA_INBUFFER_OUTBUFFER_OUT+ CLAMPCLAMP+ GND_PADDLE WL600C 22 IMAGE REJECT MIXER 29 23 46 47 7 42 43 PHASE SHIFT DATA SLICE 19 20 ACTIVE CLAMP CIRCUIT PHASE SHIFT LNA 16 BUFFER AMP IMAGE REJECT MIXER X2 44 45 17 PHASE SHIFT 10 11 PA DRIVE BUFFER 1 IF STRIP 32 2 4 5 LO BUFFER DETECTORS COMPARATOR 14 35 40 12 13 6 8 Fig. 2 WL600C block diagram DEVICE PIN OUT Pin 2 Ref Type Description 1 QUAD+ I/O Quadrature demodulator tank circuit connection 2 QUAD - I/O Quadrature demodulator tank circuit connection 3 GND_IF GND Ground for IF strip circuitry 4 DEMOD_OUT + OUT Demodulator output 5 6 DEMOD_OUT RSSI OUT OUT Demodulator output RSSI detector analogue output 7 CLAMP_SET IN Sets clamp knee voltage 8 CCA_THRESHOLD IN Sets level at which CCA comparator will switch 9 10 VCC_IFSTRIP DECOUPLE_LOG - VCC I/O 11 DECOUPLE_LOG + I/O Decoupling for log amp feedback network, AC couple 12 IF_IN + IN Log amp input, AC couple 13 IF_IN - IN 14 CCAB OUT CCA comparator output: signal = logic high, clear = logic low 15 16 GND_IF BUFFER_IN + GND IN Ground for IF strip circuitry x 2 buffer input 17 BUFFER_IN - IN 18 19 VCC_DATA RXD VCC OUT Power supply for log amp, demod, and internal references Decoupling for log amp feedback network, AC couple Log amp input, AC couple x 2 buffer input Power supply for clamp, data comparator and buffer amp Data comparator output WL600C Pin Ref Type Description 20 RXDB OUT Data comparator output 21 GND_RF GND Ground for LNA, mixer, IF summation, and PA driver circuits 22 IF_OUT- OUT Downconverter output, requires external load and RFC 23 IF_OUT+ OUT Downconverter output, requires external load and RFC 24 GND_PADDLE GND Ground for substrate and package paddle 25 VCC_RF VCC Power supply for mixer, summation, and PA ramp circuits 26 GND_RF GND Ground for LNA, mixer, IF summation, and PA driver circuits 27 VCC_LNA VCC Power supply for LNA 28 GND_RF GND 29 RF_IN IN LNA input, AC couple 30 LNA_DEGEN I/O LNA degeneration, connect to ground 31 LNA_DEGEN I/O LNA degeneration, connect to ground 32 DRIVE OUT Power amplifier driver output, requires external load and RFC 33 VCC_PA VCC Power supply for power amplifier driver 34 GND_RF GND Ground for LNA, mixer, IF summation, and PA driver circuits 35 36 RAMP_CAP PA_ON I/O IN Ground for LNA, mixer, IF summation, and PA driver circuits PA ramp circuit timing capacitor connection PA ramp circuit control input: PA on = logic high, PA off = logic low 37 STDBYB IN Power down control input: active= logic high, standby = logic low 38 TX/RXB IN Transmit/Receive control input: transmit = logic high, receive = logic low 39 GND_LO GND 40 LO_IN IN 41 VCC_LO VCC 42 DATA_IN+ IN Ground for LO buffer, phaseshifter, and standby circuitry Local oscillator input, AC couple Power supply for LO buffer, phaseshifter, and standby circuitry Data comparator input 43 DATA_IN- IN 44 BUFFER_OUT- OUT x2 buffer output 45 BUFFER_OUT+ OUT x2 buffer output 46 CLAMP - I/O Data clamp, knee voltage set by pin 7, AC couple Data clamp, knee voltage set by pin 7, AC couple 47 CLAMP + I/O 48 GND_PADDLE GND Data comparator input Ground for substrate and package paddle 3 WL600C ELECTRICAL CHARACTERISTICS These characteristics are guaranteed over the following conditions (unless otherwise stated): TAMB = -20°C to + 85°C VCC = 2.7V to 3.6V, Characteristic Value Min Typ Unit Condition Max Supply current (transmit) 50 mA Supply current (Receive) 60 mA Supply current in standby 0.3 mA PA DRIVER & RAMP CIRCUIT Logic low voltage 0 0.8 V Ramp down Logic high voltage Vcc-0.7 Vcc V Ramp up 10 µA Logic Input current Ramp capacitor charge Current Ramp capacitor voltage swing 250 µA 1 V Output power -2 2 dBm Output band 2.4 2.5 GHz Max to Min power out ratio 20 dB RECEIVER LOW NOISE AMPLIFIER & MIXERS Conversion gain 19 3rd order intercept point -10 dBm 1dB input gain compression -22 dBm Noise figure Input impedance 22 7 2.4GHz 13+j20 2.45GHz 15+j30 2.5GHz 20+j50 Image frequency rejection dB 10 Local oscillator input impedance IF output impedance Matched to 50Ohms Ohms 25 Local oscillator input level dB Differential into 600Ohms dB -16 dBm 15-j40 Ohms 600 Ohms With external 900Ω resistor TRANSMIT/RECEIVE INPUT Logic low voltage 0 0.8 V Receive mode Logic high voltage Vcc-0.7 Vcc V Transmit mode 10 µA Input current 4 WL600C ELECTRICAL CHARACTERISTICS (cont) These characteristics are guaranteed over the following conditions (unless otherwise stated): TAMB = -20°C to + 85°C VCC = 2.7V to 3.6V, Characteristic Value Min Typ Unit Condition Max LIMITING STRIP Maximum input frequency Noise figure 3.5 Input resistance 50 MHz 6 dB 1200 Capacitance Limiting strip gain 70 Limiting point -78 Ohms 0.5 pF -75 dBm Set by external 1k8 resistor dB RSSI Rise time 100 ns ±3 Non linearity dB Maximum output voltage 1.9 Output voltage @ -70dBm input 1.3 V 6 kOhms Output impedance V Input = 0dBm CLEAR CHANNEL ASSESSMENT COMPARATOR Logic high voltage 2.2 V Logic low voltage Threshold input limits 0.5 1 Input current V 2 V 1 µA DEMODULATOR Detect output voltage 0.4 Vp-p Differential. 150kHz deviation 3 MHz Dependent on Quad circuit 350 µA Vcc-1.5 V Quad circuit (2.2µH/40kΩ) Detected signal bandwidth Output pull down current Output DC common mode CLAMP CIRCUIT Knee voltage range Clamp set range 0.1 0.350 V 1 2 V Inversely proportional to knee voltage DC bias at inputs Vcc-1 V Slope resistance 100 Ohms OUTPUT COMPARATOR Input offset voltage Input current Output rise/fall time 11 Output voltage swing Input common mode range Output common mode 15 5 mV 1 µA 20 ns For load capacitiance 0-10pF mV pk-pk differential 400 1 Vcc-0.7 Vcc-0.85 V V 5 WL600C ELECTRICAL CHARACTERISTICS (cont) These characteristics are guaranteed over the following conditions (unless otherwise stated): TAMB = -20°C to + 85°C VCC = 2.7V to 3.6V, Characteristic Value Min Typ Unit Condition Max BUFFER AMP Buffer amplifier gain Input common mode range 2 1.2 Output common mode Vcc-0.5 V 450 mV Vcc-1.5 Max difference between inputs Output pull down current V Amp will limit outside this range µA 350 STANDBY INPUT Chip must be in receive mode when switching to/from standby Logic low voltage 0 Logic high voltage Vcc-0.7 Input current 0.8 Vcc V Circuit powered down V Circuit powered up µA 100 µs Standby to receive time FUNCTIONAL DESCRIPTION RECEIVE TRANSMIT The RF input stage of the WL600C receiver is a 2.5GHz low noise amplifier (LNA). The output of the single ended LNA is split and fed into the inputs of two mixers which form an image rejecting down converter. An external oscillator (2.357 → 2.457GHz)is fed through an RC phase shift network to provide the required quadrature local oscillator signal. The mixer outputs are fed through further phase shift networks and are combined to form a differential 43MHz IF signal which is used to drive the 43MHz SAW filter. The output of the SAW filter is fed into a differential limiting strip which provides the IF gain. The strip has a series of detectors whose output provides an analog voltage indicating receive signal strength (RSSI). Alternatively, for basic applications a comparator connected to the RSSI detectors can be used. When the RSSI signal is greater than a value set by the CCA_THRESHOLD input the clear channel assessment (CCAB) output goes high. A conventional quadrature demodulator (with external tuned circuit to supply the quadrature drive) provides the analogue data stream which is then AC coupled to a data slice comparator. A clamp circuit is connected between the comparator inputs to provide DC restoration of the AC coupled signal. The comparator output then goes to the data and clock recovery circuits on a CMOS integrated circuit (such as the WL102). The local oscillator signal is also used in transmit at a higher frequency (2.4 →2.5GHz) and is buffered and amplified on the WL600C. This provides the drive to the transmit power amplifier (also off chip). A ramp circuit is included to control the drive level to the power amplifier in a controlled manner. This is done at the start and end of a transmit sequence and should be used to prevent the generation of spectral “splash”. A single external capacitor controls the rate of increase and decrease of the power drive level. 6 WL600C CONTROL WAVEFORMS TX/RXB PA_ON Ramp_Cap RF output PA_Drive Fig. 3 Transmit control waveforms CONTROL LOGIC Control Line Logic ‘0’ Logic ‘1’ TX/RXB Receive Transmit PA_ON PA off PA on STDBYB Standby Active 7 http://www.mitelsemi.com World Headquarters - Canada Tel: +1 (613) 592 2122 Fax: +1 (613) 592 6909 North America Tel: +1 (770) 486 0194 Fax: +1 (770) 631 8213 Asia/Pacific Tel: +65 333 6193 Fax: +65 333 6192 Europe, Middle East, and Africa (EMEA) Tel: +44 (0) 1793 518528 Fax: +44 (0) 1793 518581 Information relating to products and services furnished herein by Mitel Corporation or its subsidiaries (collectively “Mitel”) is believed to be reliable. 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