WL800
2.5GHz Frequency Synthesiser
Preliminary Information
DS4583 1.6 October1997
The WL800 is a low power single chip frequency synthesiser.
The circuit is fabricated on Mitel Semiconductor HG process
and operates from a supply voltage of 2.7 - 3.6V. It is designed
to work with the Mitel Semiconductor WL600C RF and IF
circuit and the WL102 WLAN controller chip which together
make up the DE6038 frequency hopping Wireless Local Area
Network (WLAN) transceiver.
PIN 1 IDENT
FEATURES
s
Low power consumption
s
2.5GHz input
s
144 frequencies, 1MHz steps (20MHz crystal)
s
Forms complete phase locked loop using external
VCO and loop components
s
Serially programmed via 3 wire bus
s
Contains anti-modulation circuit
s
Part of DE6038 Chip-set (WL600C, WL102)
ORDERING INFORMATION
WL800/KG/TP1R
TQFP 32
Fig.1 Pin connections - top view
RELATED DOCUMENTS
WL600C, WL102 datasheets
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Vcc
4VDC
Transmit/Receive and
-0.5VDC to Vcc +0.5VDC
Standby Input
Prescaler Inputs Pins 30 &31 No DC. Externally Capacitively
Coupled.
Output Current (any output)
TBD mA
Junction temperature Tj
150°C
ESD protection:
2kV
Operating temperature
-20 to +85°C
WL800
DEVICE PIN OUT
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
25
26
27
28
29
30
31
32
REFERENCE
VCC1
CS-DATA
CS-CLK
CS-LOADB
STDBYB
VEE1
ISET
ICP
VEE3
TXD
COM CAP
RCOMP
IDOUT
TXRXB
VARICAP
VCC3
LOOPFILTER
CPUMPREF
CPUMPOUT
VEE2
SYSCLK
XTAL
XTALB
VCC2
FREF
LKCAP
LCKDETB
FV
VEE5
VCC
VCOIPB
VCOIP
GND
IN
OUT
OUT
IN
OUT
VCC
OUT
OUT
GND
OUT
TYPE
VCC
IN
IN
IN
IN
GND
DESCRIPTION
Power for serial data bus
Channel Data in (Synth Programming)
Data Clock (Synth Programming)
Data Enable (Synth Programming)
Power down control Active = Logic 1 Standby = logic 0
Ground connection
Set modulation current
Set charge pump current
Ground connection
Modulation data in
Compensation capacitor for modulation data
Resistor for V/I converter
Modulation data out
Transmit/Receive control Transmit = Logic 1 Receive = Logic 0
Control V to varicap in VCO
Power for charge pump and loop amplifier and modulator
Loop filter out (Loop Filter Components)
Charge pump reference voltage
Charge pump out (Loop Filter Components)
Ground connection
Reference (system) clock out
Crystal connection (Differential)
Crystal connection (Differential)
Power for reference oscillator
Reference frequency monitor
Lock detect capacitor
Lock detect output
VCO frequency / (NM+A) monitor
Ground connection
Power for prescaler, AM counter Ref divider, phase detector and
lock detector
Prescaler IN-
Prescaler IN+
VCC
OUT
OUT
OUT
GND
VCC
IN
IN
2
WL800
21
12
23
22
REF
SYSCLK
RCOMP
XTALB
XTAL2
XTAL1
B
OUT
VCAP
CHARGE
CAP
BUFFER
28
FV
6,9,20,29
14
Vee
TXRXB
1,16,24,30
Vcc
COMP
COMPCAP
11
IDOUT
13
STANDBY
STDBYB
5
DATA
BUFFER
DIN
TXD
10
MOD
COMP
REF OUT
BUFFER
REFERENCE
OSC
DIVIDE
BY 20
FREF
25
ISET
7
LKCAP
26
VCOIP
32
VCOIPB
31
PRE
AMP
PRE-SCALER
A COUNTER
M COUNTER
PHASE DET
& CHARGE
PUMP
LOCK
DETECT
LKDETB
LCKDETB
27
INPUT REGISTER
1/3
LOOP
FILTER
17
DATA
CS-DATA
2
CLK
CS-CLK
3
ENABLEB
CS-LOADB
4
ICP
8
CPUMP
REF
18
CPUMP
OUT
19
VARICAP
15
Fig. 1 WL800 block diagram
3
WL800
ELECTRICAL CHARACTERISTICS
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
MIN
Supply current (total)
Transmit
Receive
Supply current in standby
PROGRAMMING INPUTS
Logic low voltage
Logic high voltage
Input current
Data clock frequency (1/tclock)
Data/Enable set up time (t set up)
Enable hold time (t enable)
Positive clock pulse width (tp)
Negative clock pulse width (t neg)
STANDBY INPUT
Logic low input voltage
Logic high input voltage
Input current
Standby to operate time
37
35
3
50
50
5
mA
mA
mA
Value
TYP
MAX
Unit
Condition
0
0.8Vcc
0.4
Vcc
1
20
V
V
µA
MHz
ns
ns
ns
ns
Input level high
See Fig. 2
See Fig. 2
See Fig. 2
See Fig. 2
See Fig. 2
10
10
20
20
0
Vcc -0.7
100
3
0.8
Vcc
150
-150
V
V
µA
µA
µs
Circuit powered down
Circuit powered up
Circuit powered up
Circuit powered down
*References operational (see note 1)
TX/RX INPUT
Logic low input voltage
Logic high input voltage
Input current
REFERENCE OUTPUT
Reference output frequency
Reference clock output voltage
Reference output impedance
Mark Space ratio
Rise time
Fall time
Crystal Drive Levels required
0
Vcc -0.7
0.8
Vcc
10
V
V
µA
Receive mode
Transmit mode
20
200
-2%
250
600
50/50
300
+2%
15
15
200
MHz
mVp-p
Ohms
ns
ns
mV
With 20MHz crystal
With 15pF load
With 15pF load
Pins 22,23 differential
4
WL800
ELECTRICAL CHARACTERISTICS (continued)
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
MIN
LOCK DETECT CIRCUIT
Smoothing capacitor charge/
discharge current
Threshold voltage
Output high voltage
Output low voltage
PHASE DETECTOR AND
CHARGE PUMP
Comparison frequency
Charge pump output current
Up down current matching
Reference voltage
CHARGE PUMP OP-AMP
First Stage:
High output voltage
Low output voltage
Second Stage:
Filter drive amplifier output current
Filter drive amp output swing
±1
0.77
2.4
0.3
V
V
mA
Vp-p
V
cc
-1.05
1
±1
5
V
cc
-0.7
MHz
mA
%
V
Divided crystal reference
Rpin 8 = 10k
80
110
Vcc-0.3
1.8
Vee
Vcc
0.5
150
µA
V
V
V
Determined by application.
On smoothing capacitor
I out = 10µA
I out = 0
µA
Value
TYP
MAX
Unit
Condition
PRESCALER
Input drive voltage
Maximum operating frequency
Input Impedance
40
3
330Ω
0.5pF
200
mV rms
GHz
TRANSMIT DATA INPUT
Logic low
Logic high
TX DATA OUT
Logic 0 output current
Logic 1 output current
Output current in receive mode
25
50
100
200
25
µA
nA
µA
Set by external resistor on pin 7
Leakage Current
Equal to 0.5 mod current
-60
+60
-100
+100
µA
µA
Rsource=20k
5
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