ML2723
900MHz Low-IF 1.5Mbps FSK Transceiver
Preliminary Datasheet
DS2723-P-01
AUGUST
2005
GENERAL DESCRIPTION
The ML2723 is a fully integrated 1.5Mbps frequency
shift keyed (FSK) transceiver that operates in the
unlicensed 900MHz ISM frequency band. The device
has been optimized for digital cordless telephone
applications and includes all the frequency generation,
receive and transmit functions. Automatically adjusted
filters eliminate mechanical tuning. The transmitter
generates a -1dBm FSK output signal. The single
conversion Low-IF receiver has all the sensitivity and
selectively advantages of a traditional super-
heterodyne without requiring costly, bulky external
filters, while providing the integration advantages of
direct conversion.
The phase locked loop (PLL) synthesizer is completely
integrated, including the voltage controlled oscillator
(VCO), tuning circuits, and VCO resonator. This allows
the ML2723 to be used in frequency hopped spread
spectrum (FHSS) applications.
The ML2723 contains internal voltage regulation. It also
contains PLL and transmitter configuration registers.
The device can be placed in a low power standby mode
for current sensitive applications.
PIN CONFIGURATION
ORDERING INFORMATION
FEATURES
Single Chip ISM Band 900MHz Radio Transceiver
with 1dBm Transmit Output Power
1.5Mbps Maximum Data Rate
Analog And Digital (Sliced) Data Output
Typical
Receiver
Sensitivity: -95dBm At 12.5% BER
Fully Integrated Frequency Synthesizer With
Internal VCO Resonator
Automatic Filter Calibration: Requires No
Mechanical Tuning Adjustments During
Manufacturing
Low IF Receiver: No External IF Filters Required
Control Outputs Correctly Sequence And Control
External PA
3-Wire Control Interface
Analog RSSI Output
"Green" (Pb-Free) 32 LPCC package (5mm x 5mm)
APPLICATIONS
900MHz FSK Data Transceivers
- Digital
Cordless
Phones/Headsets
-
Wireless Streaming Media
- Wireless
PC
Peripherals
BLOCK DIAGRAM
PART #
TEMP RANGE
PACKAGE
PACK (QTY)
ML2723DM -10
o
C to +60
o
C 32 LPCC 5x5mm
Tray (490)
ML2723DM-T -10
o
C to +60
o
C 32 LPCC 5x5mm
Tape & Reel (2500)
VCC5
TRFO
RVCC4
RRFI
GND
GND
GND
GND
24
23
22
21
20
19
18
17
32
31
30
29
28
27
26
25
DOU
T
VDD
DIN
RVCC7
RSSI/TPI
RVCC6
VBG
GND
XCEN
RXON
PAON
EN
DATA
CLK
AOUT/TPQ
VSS
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
VTUNE
RVCC3
VCC2
GND
QP
O
RVCC1
REF
IMAGE
REJECT
MIXER
ML2723
IF DEMOD
CIRCUITS
CONTROL
LOGIC
PLL
RRFI
AOUT
DIN
RSSI
REF
CLK,
DATA,
EN
XCEN,
RXON
2
VCC5
TX DATA
FILTER
LOOP
FILTER
VTUNE
QPO
QUADRATURE
DIVIDE BY 2
1.83GHz VCO
TX RF
BUFFER
TRFO
3
PAON
DOUT
ML2723
DS2723-P-01
PRELIMINARY DATASHEET AUGUST 2005
2
TABLE OF CONTENTS
GENERAL DESCRIPTION ........................................................................................................................................... 1
PIN CONFIGURATION ................................................................................................................................................. 1
ORDERING INFORMATION ........................................................................................................................................ 1
FEATURES ................................................................................................................................................................... 1
APPLICATIONS ............................................................................................................................................................ 1
BLOCK DIAGRAM........................................................................................................................................................ 1
TABLE OF CONTENTS................................................................................................................................................ 2
SIMPLIFIED APPLICATIONS DIAGRAM ..................................................................................................................... 3
ELECTRICAL CHARACTERISTICS............................................................................................................................. 4
PIN DESCRIPTIONS.................................................................................................................................................... 7
FUNCTIONAL DESCRIPTION ................................................................................................................................... 13
MODES OF OPERATION........................................................................................................................................... 15
CONTROL INTERFACES........................................................................................................................................... 18
CONTROL INTERFACES AND REGISTER DESCRIPTIONS................................................................................... 20
APPLICATION SCHEMATIC ...................................................................................................................................... 27
PHYSICAL DIMENSIONS (INCHES/MILLIMETERS) ................................................................................................ 28
WARRANTY................................................................................................................................................................ 29
ML2723
DS2723-P-01
PRELIMINARY DATASHEET AUGUST 2005
3
SIMPLIFIED APPLICATIONS DIAGRAM
IMAGE
REJECT
MIXER
ML2723
IF DEMOD
CIRCUITS
CONTROL
LOGIC
PLL
BASEBAND
IC
RRFI
DOUT
DIN
RSSI
REF
CLK,
DATA,
EN
XCEN,
RXON
2
VCC5
TX DATA
FILTER
LOOP
FILTER
BATTERY
AND
PROTECTION
CIRCUITS
VTUNE
QPO
QUADRATURE
DIVIDE BY 2
1.83GHz VCO
TX RF
BUFFER
PA
TRFO
3
SWITCH
DRIVERS
RF PIN
DIODE
SWITCH
ANTENNA
MATCHING
NETWORK
FILTER
LNA
PAON
AOUT
Figure 1. Simplified Application Diagram
ML2723
DS2723-P-01
PRELIMINARY DATASHEET AUGUST 2005
4
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute
maximum ratings are stress ratings only and functional device operation is not implied.
VDD, VCC5 ................................................................................................................................................................. 6.0V
VSS, GND ............................................................................................................................................................. 0 0.3V
Junction Temperature............................................................................................................................................... 150C
Storage Temperature Range ...................................................................................................................... -65C to 150C
Package Pin Temperature (Soldering, 10s) ............................................................................................................. 260C
OPERATING CONDITIONS
Normal Temperature Range ......................................................................................................................... -10C to 60C
VCC5 Range ...................................................................................................................................................2.7V to 4.5V
Thermal Resistance (
JA
)....................................................................................................................................... 36C/W
VDD Range (VCC5 VDD).............................................................................................................................2.7V to 4.5V
Test conditions unless otherwise specified, VCC5 & VDD = 2.8V to 3.8V, T
A
= -10C to 60C, reference frequency =
6.144 or 12.288MHz .
SYM PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
POWER CONSUMPTION
I
STBY
All Circuits, Standby Mode
10
100
A
I
RX,
I
TX
Receive or Transmit Mode
T
A
= 25C, VCC5 & VDD = 3.3V
30
50
63.5
mA
I
RX,
I
TX
Receive or Transmit Mode
T
A
= Operating Temperature Range
20
50
70
mA
SYNTHESIZER
f
C
LO output frequency
In 512kHz steps
902
928
MHz
N
Phase noise at driver output
1.2MHz
3MHz
>7MHz
VCO phase locked, loop bandwidth
50kHz. Discontinuities, other than
reference spurs, not allowed.
-100
-120
-125
dBc/Hz
f
REF
LO PLL reference frequency at
phase detector
PLL main divider input is at 1.83GHz
1.024
MHz
N
LO division range integer
PLL divider limits
1024
4093
Count
I
P
LO charge pump sink/source
current
5.5
mA
t
TX2RX
LO lock up time for
Transmit/Receive frequency
change
From RXON asserted
50
s
t
FH
LO lock up time for channel
switch
From EN asserted, any channel
change in 902 to 928MHz band
100
s
t
WAKE
LO lock up time from sleep
From XCEN, PLL dividers
programmed
240
s
V
FREF
Reference signal input level
6.144 or 12.288MHz sine wave,
capacitively coupled
2.0 3.0 Vp-p
ML2723
DS2723-P-01
PRELIMINARY DATASHEET AUGUST 2005
5
SYM PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
RECEIVER
Z
IN
Receiver RF impedance
f
c
=915MHz
17-j50
NF
Receiver RF noise figure
f
c
=915MHz
9
dB
DR
RX
Data Rate
FSK modulation, fdev=+/-460kHz
1.536
Mbps
S Input
Sensitivity
<12.5% CER at 1.536Mchips/s
<1% BER at 1.536Mbps
-95
-89
dBm
BW
RX
Bandwidth
3dB
nominal
770
kHz
P
IMAX
Maximum RX RF input
<12.5% BER at 1.536Mchip/s
8
dBm
I
IP3
Receiver input IP3
Test tones 2 and 4 channels away
-12
dBm
LO Leakage at RXI
-80
dBm
IRR
Receive RF mixer image
rejection
Measured at 3.5MHz offset
35
dB
Adjacent channel rejection
-80dBm wanted signal <12.5% BER (a
single interferer with 2GFSK
modulation to give a
-20dBc bandwidth of 1.5MHz)
1 channel
2 channels
3 or more channels
15
40
45
dB
Receiver settling time
RXON high to valid data
120
s
IF FILTERS
f
IFC
IF filter center frequency
After Automatic Filter Alignment
1.024
MHz
BW
IF
IF filter 3dB bandwidth
After Automatic Filter Alignment
1405
kHz
LIMITER, AGC, AND FM DEMODULATOR
t
OVLD
Recovery from overload
From 0dBm at input
5
12
s
Eb/No
For 12.5% BER
3
dB
Co-Channel rejection, 12.5%
BER
-80dBm, modulated with 1.536Mbps
GFSK, BT=0.5, PRBS data
4 dB
V
ODC
Mean DC voltage @ AOUT
R
L
=100K
0.8
V
V
OPK
AC output voltage swing @
AOUT
R
L
=100K
0.7
V
PP
RSSI PERFORMANCE
t
RRSSI
RSSI rise time: < -100dBm to
-15dBm into the IF mixer
20pF load, 20% to 80%
1
5.3
10
s
t
FRSSI
RSSI fall time: <-15dBm to
<-100dBm into the IF mixer
20pF load, 20% to 80%
1
4.4
10
s
V
RSMX
RSSI maximum voltage
-15dBm in
2.2
2.8
V
V
RSMN
RSSI minimum voltage
No signal
0.05
V
G
RSMID
RSSI sensitivity, mid range
28
35
42
mV/dB
P
RSMX
RSSI maximum signal
Sensitivity is >50% mid range
-20
dBm
P
RSMN
RSSI minimum signal
Sensitivity is >50% mid range
-95
dBm
RSSI accuracy
Measured at -40dBm input power
1.5
1.9
2.1
V
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