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wl600c 2.4 - 2.5ghz rf and if circuit preliminary information ds4581 issue 2.1 august 1997 ordering information wl600c/kg/gp1r figure 1 - pin connections - top view 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 minimal external components 48 lead lqfp package absolute maximum ratings supply voltage vcc 4v transmit/receive and standby input -0.5 to vcc +0.5v current consumption tbd junction temperature tj 150 esd protection 2kv related documents datasheets wl800/102 de6038 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 zarlink 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. lqfp48 pin 48 pin 1 ident pin 1 pin description pin description 1 quad+ 25 vcc_rf 2 quad- 26 gnd_rf 3 gnd_if 27 vcc_lna 4 demod_out+ 28 gnd_rf 5 demod_out- 29 rf_in 6 rssi 30 lna_degen 7 clamp_set 31 lna_degen 8 cca_threshold 32 drive 9 vcc_ifstrip 33 vcc_pa 10 decouple_log- 34 gnd_rf 11 decouple_log+ 35 ramp_cap 12 if_in+ 36 pa_on 13 if_in- 37 stdbyb 14 ccab 38 tx/rxb 15 gnd_if 39 gnd_lo 16 buffer_in+ 40 lo_in 17 buffer_in- 41 vcc_lo 18 vcc_data 42 data_in+ 19 rxd 43 data_in- 20 rxdb 44 buffer_out- 21 gnd_rf 45 buffer_out+ 22 if_out- 46 clamp- 23 if_out+ 47 clamp+ 24 gnd_paddle 48 gnd_paddle
2 wl600c preliminary information figure 2 - wl600c block diagram active clamp circuit image reject mixer phase shift phase shift 29 lna image reject mixer 32 pa drive buffer lo buffer 35 40 12 13 6 8 phase shift 22 23 46 47 7 42 43 data slice 19 20 16 44 45 x2 buffer amp 17 10 11 1 2 4 5 14 comparator detectors if strip device pin out pin 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 demod_out - out demodulator output 6 rssi out 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 vcc_ifstrip vcc power supply for log amp, demod, and internal references 10 decouple_log - i/o decoupling for log amp feedback network, ac couple 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 log amp input, ac couple 14 ccab out cca comparator output: signal = logic high, clear = logic low 15 gnd_if gnd ground for if strip circuitry 16 buffer_in + in x 2 buffer input 17 buffer_in - in x 2 buffer input 18 vcc_data vcc power supply for clamp, data comparator and buffer amp 19 rxd out data comparator output
3 wl600c preliminary information 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 ground for lna, mixer, if summation, and pa driver circuits 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 ramp_cap i/o pa ramp circuit timing capacitor connection 36 pa_on in 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 ground for lo buffer, phaseshifter, and standby circuitry 40 lo_in in local oscillator input, ac couple 41 vcc_lo vcc power supply for lo buffer, phaseshifter, and standby circuitry 42 data_in+ in data comparator input 43 data_in- in data comparator input 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 47 clamp + i/o data clamp, knee voltage set by pin 7, ac couple 48 gnd_paddle gnd ground for substrate and package paddle
4 wl600c preliminary information characteristic value unit condition min typ 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 logic input current 10 a ramp capacitor charge current 250 a ramp capacitor voltage swing 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 22 db differential into 600ohms 3rd order intercept point -10 dbm 1db input gain compression -22 dbm noise figure 7 10 db matched to 50ohms input impedance 2.4ghz 13+j20 ohms 2.45ghz 15+j30 2.5ghz 20+j50 image frequency rejection 25 db local oscillator input level -16 dbm local oscillator input impedance 15-j40 ohms if output impedance 600 ohms with external 900 ? resistor transmit/receive input logic low voltage 0 0.8 v receive mode logic high voltage vcc-0.7 vcc v transmit mode input current 10 a electrical characteristics these characteristics are guaranteed over the following conditions (unless otherwise stated): t amb = -20 c to + 85 c v cc = 2.7v to 3.6v,
5 wl600c preliminary information characteristic value unit condition min typ max limiting strip maximum input frequency 50 mhz noise figure 3.5 6 db input resistance 1200 ohms set by external 1k8 resistor capacitance 0.5 pf limiting strip gain 70 db limiting point -78 -75 dbm rssi rise time 100 ns non linearity 3db maximum output voltage 1.9 v input = 0dbm output voltage @ -70dbm input 1.3 v output impedance 6 kohms clear channel assessment comparator logic high voltage 2.2 v logic low voltage 0.5 v threshold input limits 1 2 v input current 1 a demodulator detect output voltage 0.4 vp-p differential. 150khz deviation quad circuit (2.2 h/40k ? ) detected signal bandwidth 3 mhz dependent on quad circuit output pull down current 350 a output dc common mode vcc-1.5 v clamp circuit knee voltage range 0.1 0.350 v clamp set range 1 2 v inversely proportional to knee voltage dc bias at inputs vcc-1 v slope resistance 100 ohms output comparator input offset voltage 5 mv input current 1 a output rise/fall time 11 15 20 ns for load capacitiance 0-10pf output voltage swing 400 mv pk-pk differential input common mode range 1 vcc-0.7 v output common mode vcc-0.85 v electrical characteristics (cont) these characteristics are guaranteed over the following conditions (unless otherwise stated): t amb = -20 c to + 85 c v cc = 2.7v to 3.6v,
6 wl600c preliminary information characteristic value unit condition min typ max buffer amp buffer amplifier gain 2 input common mode range 1.2 vcc-0.5 v output common mode vcc-1.5 v max difference between inputs 450 mv amp will limit outside this range output pull down current 350 a standby input chip must be in receive mode when switching to/from standby logic low voltage 0 0.8 v circuit powered down logic high voltage vcc-0.7 vcc v circuit powered up input current 100 a standby to receive time s functional description receive 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). transmit 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 capaci- tor controls the rate of increase and decrease of the power drive level. electrical characteristics (cont) these characteristics are guaranteed over the following conditions (unless otherwise stated): t amb = -20 c to + 85 c v cc = 2.7v to 3.6v,
7 wl600c preliminary information figure 3 - transmit control waveforms control waveforms rf output tx/rxb pa_on ramp_cap pa_drive control line logic 0 logic 1 tx/rxb receive transmit pa_on pa off pa on stdbyb standby active control logic
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