FEATURES
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Part of DE6038 chipset (WL800, WL102)
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High level of integration
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Low noise figure
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Low power consumption
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High data rates with comparator for 2 level FSK
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Minimal external components
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48 lead LQFP package
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.
LQFP48
Fig.1 Pin connections - top view
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
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
PIN 48
PIN 1 IDENT
PIN 1
ORDERING INFORMATION
WL600C/KG/GP1R
RELATED DOCUMENTS
Datasheets WL800/102 DE6038
WL600C
2.4 - 2.5GHz RF and IF Circuit
Preliminary Information
DS4581 2.1 August 1997
2
WL600C
Fig. 2 WL600C block diagram
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
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
3
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
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
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,
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
5
WL600C
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
3
dB
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
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
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,
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.
7
WL600C
CONTROL WAVEFORMS
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
RF output
TX/RXB
PA_ON
Ramp_Cap
PA_Drive
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Copyright 1999 MITEL Corporation
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