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WL600KG Schematic ( PDF Datasheet ) - Mitel Networks Corporation

Teilenummer WL600KG
Beschreibung 2.4 - 2.5GHz RF and IF Circuit
Hersteller Mitel Networks Corporation
Logo Mitel Networks Corporation Logo 




Gesamt 9 Seiten
WL600KG Datasheet, Funktion
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.
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
4V
Transmit/Receive and standby input -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 1
PIN 48
PIN 1 IDENT
LQFP48
Fig.1 Pin connections - top view
Pin Description Pin
1
QUAD+
25
2
QUAD-
26
3
GND_IF
27
4 DEMOD_OUT+ 28
5
DEMOD_OUT-
29
6
RSSI
30
7
CLAMP_SET
31
8 CCA_THRESHOLD 32
9
VCC_IFSTRIP
33
10 DECOUPLE_LOG- 34
11 DECOUPLE_LOG+ 35
12 IF_IN+ 36
13 IF_IN- 37
14 CCAB 38
15 GND_IF 39
16 BUFFER_IN+ 40
17 BUFFER_IN- 41
18 VCC_DATA 42
19 RXD 43
20 RXDB 44
21 GND_RF 45
22 IF_OUT- 46
23 IF_OUT+ 47
24 GND_PADDLE 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_IN-
BUFFER_OUT-
BUFFER_OUT+
CLAMP-
CLAMP+
GND_PADDLE






WL600KG Datasheet, Funktion
WL600C
ELECTRICAL CHARACTERISTICS (cont)
These characteristics are guaranteed over the following conditions (unless otherwise stated):
T
AMB
=
-20°C
to
+
85°C
VCC
=
2.7V
to
3.6V,
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 µA
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 µA
Standby to receive time
µs
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.
6

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