MITEL WL600KG

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
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