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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 s Part of DE6038 chipset (WL800, WL102) s High level of integration s Low noise figure s Low power consumption s High data rates with comparator for 2 level FSK s Minimal external components s 48 lead LQFP package ABSOLUTE MAXIMUM RATINGS
Supply voltage Vcc Transmit/Receive and standby input Current consumption Junction temperature Tj ESD protection 4V -0.5 to Vcc +0.5V TBD 150 2KV Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
LQFP48
Fig.1 Pin connections - top view
Description 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 Pin 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Description 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
ORDERING INFORMATION WL600C/KG/GP1R
RELATED DOCUMENTS Datasheets WL800/102 DE6038
WL600C
22 IMAGE REJECT MIXER PHASE SHIFT
23 46 47
7
42
43
DATA SLICE 19 20
29
LNA
PHASE SHIFT
ACTIVE CLAMP CIRCUIT BUFFER AMP X2
16 44 45 17 10 11 1
IMAGE REJECT MIXER PA DRIVE BUFFER 32
PHASE SHIFT
IF STRIP
2 4 5
LO BUFFER
DETECTORS
COMPARATOR 14
35
40
12
13
6
8
Fig. 2 WL600C block diagram
DEVICE PIN OUT
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Ref QUAD+ QUAD GND_IF DEMOD_OUT + DEMOD_OUT RSSI CLAMP_SET CCA_THRESHOLD VCC_IFSTRIP DECOUPLE_LOG DECOUPLE_LOG + IF_IN + IF_IN CCAB GND_IF BUFFER_IN + BUFFER_IN VCC_DATA RXD Type I/O I/O GND OUT OUT OUT IN IN VCC I/O I/O IN IN OUT GND IN IN VCC OUT Description Quadrature demodulator tank circuit connection Quadrature demodulator tank circuit connection Ground for IF strip circuitry Demodulator output Demodulator output RSSI detector analogue output Sets clamp knee voltage Sets level at which CCA comparator will switch Power supply for log amp, demod, and internal references Decoupling for log amp feedback network, AC couple Decoupling for log amp feedback network, AC couple Log amp input, AC couple Log amp input, AC couple CCA comparator output: signal = logic high, clear = logic low Ground for IF strip circuitry x 2 buffer input x 2 buffer input Power supply for clamp, data comparator and buffer amp Data comparator output
2
WL600C
Pin 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
Ref RXDB GND_RF IF_OUTIF_OUT+ GND_PADDLE 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+ CLAMP CLAMP + GND_PADDLE
Type OUT GND OUT OUT GND VCC GND VCC GND IN I/O I/O OUT VCC GND I/O IN IN IN GND IN VCC IN IN OUT OUT I/O I/O GND
Description Data comparator output Ground for LNA, mixer, IF summation, and PA driver circuits Downconverter output, requires external load and RFC Downconverter output, requires external load and RFC Ground for substrate and package paddle Power supply for mixer, summation, and PA ramp circuits Ground for LNA, mixer, IF summation, and PA driver circuits Power supply for LNA Ground for LNA, mixer, IF summation, and PA driver circuits LNA input, AC couple LNA degeneration, connect to ground LNA degeneration, connect to ground Power amplifier driver output, requires external load and RFC Power supply for power amplifier driver 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 Power down control input: active= logic high, standby = logic low Transmit/Receive control input: transmit = logic high, receive = logic low 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 Data comparator input x2 buffer output x2 buffer output Data clamp, knee voltage set by pin 7, AC couple Data clamp, knee voltage set by pin 7, AC couple Ground for substrate and package paddle
3
WL600C
ELECTRICAL CHARACTERISTICS
These characteristics are guaranteed over the following conditions (unless otherwise stated): TAMB = -20C to + 85C VCC = 2.7V to 3.6V, Characteristic Min Supply current (transmit) Supply current (Receive) Supply current in standby PA DRIVER & RAMP CIRCUIT Logic low voltage Logic high voltage Logic Input current Ramp capacitor charge Current Ramp capacitor voltage swing Output power Output band Max to Min power out ratio RECEIVER LOW NOISE AMPLIFIER & MIXERS Conversion gain 3rd order intercept point 1dB input gain compression Noise figure Input impedance 2.4GHz 2.45GHz 2.5GHz Image frequency rejection Local oscillator input level Local oscillator input impedance IF output impedance 25 -16 15-j40 600 19 -10 -22 7 13+j20 15+j30 20+j50 dB dBm Ohms Ohms With external 900 resistor 10 22 dB dBm dBm dB Ohms Matched to 50Ohms Differential into 600Ohms -2 2.4 20 250 1 2 2.5 0 Vcc-0.7 0.8 Vcc 10 V V A A V dBm GHz dB Ramp down Ramp up Value Typ 50 60 0.3 Max mA mA mA Unit Condition
TRANSMIT/RECEIVE INPUT Logic low voltage Logic high voltage Input current 0 Vcc-0.7 0.8 Vcc 10 V V A Receive mode Transmit mode
4
WL600C
ELECTRICAL CHARACTERISTICS (cont)
These characteristics are guaranteed over the following conditions (unless otherwise stated): TAMB = -20C to + 85C VCC = 2.7V to 3.6V, Characteristic Min LIMITING STRIP Maximum input frequency Noise figure Input resistance Capacitance Limiting strip gain Limiting point RSSI Rise time Non linearity Maximum output voltage Output voltage @ -70dBm input Output impedance CLEAR CHANNEL ASSESSMENT COMPARATOR Logic high voltage Logic low voltage Threshold input limits Input current DEMODULATOR Detect output voltage Detected signal bandwidth Output pull down current Output DC common mode CLAMP CIRCUIT Knee voltage range Clamp set range DC bias at inputs Slope resistance OUTPUT COMPARATOR Input offset voltage Input current Output rise/fall time Output voltage swing Input common mode range Output common mode 1 Vcc-0.85 11 15 400 Vcc-0.7 5 1 20 mV A ns mV V V For load capacitiance 0-10pF pk-pk differential 0.1 1 Vcc-1 100 0.350 2 V V V Ohms Inversely proportional to knee voltage 0.4 3 350 Vcc-1.5 Vp-p MHz A V Differential. 150kHz deviation Quad circuit (2.2H/40k) Dependent on Quad circuit 1 2.2 0.5 2 1 V V V A 1.9 1.3 6 100 3 ns dB V V kOhms Input = 0dBm 70 -78 -75 3.5 1200 0.5 50 6 MHz dB Ohms pF dB dBm Set by external 1k8 resistor Value Typ Max Unit Condition
5
WL600C
ELECTRICAL CHARACTERISTICS (cont)
These characteristics are guaranteed over the following conditions (unless otherwise stated): TAMB = -20C to + 85C VCC = 2.7V to 3.6V, Characteristic Min BUFFER AMP Buffer amplifier gain Input common mode range Output common mode Max difference between inputs Output pull down current STANDBY INPUT Logic low voltage Logic high voltage Input current Standby to receive time 0 Vcc-0.7 100 0.8 Vcc V V A s 350 1.2 Vcc-1.5 450 2 Vcc-0.5 V V mV A Chip must be in receive mode when switching to/from standby Circuit powered down Circuit powered up Amp will limit outside this range Value Typ Max Unit Condition
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 capacitor controls the rate of increase and decrease of the power drive level.
6
WL600C
CONTROL WAVEFORMS
TX/RXB
PA_ON
Ramp_Cap
PA_Drive
RF output
Fig. 3 Transmit control waveforms
CONTROL LOGIC
Control Line TX/RXB PA_ON STDBYB Logic `0' Receive PA off Standby Logic `1' Transmit PA on Active
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