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RX3141

型号：

RX3141

描述：

鼠标。寻呼机。\n[ Mouse. Pager. ]

品牌：

ETC[ ETC ]

页数：

10 页

PDF大小：

169 K

下载PDF手册
RX3141 Low Power IF Receiver IC  
the wireless IC company  
HiMARK Technology, Inc. reserves the right to change the product described in this datasheet. All information con-  
tained in this datasheet is subject to change without prior notice. HiMARK Technology, Inc. assumes no responsibility  
for the use of any circuits shown in this datasheet.  
Description  
The RX3141 is a low power IF receiver IC which is fully compatible with the Toshiba  
TA31145 IC and is suitable for use as the second IF downconverter in double-conversion  
paging systems. The RX3141 is well-suited for POCSAG paging applications and incor-  
porates a 2-level FSK demodulator consisting of a quadrature FM demodulator, on-chip  
bit-rate filter, and 1-bit comparator. An on-chip 1 V regulator is provided for convenient  
biasing of off-chip circuitry. In addition, an RSSI voltage output is included as a measure  
of the received signal strength.  
Features  
! Extremely low power operation with power-down feature  
! Built-in crystal oscillator for mixer local oscillator  
! Mixer input frequency: 10 — 50 MHz  
! RSSI function  
! Quadrature detector  
! On-chip bit-rate filter  
! Audio output  
! 1-bit comparator with open collector output  
! 1 V regulator  
! 1.1 V low battery alarm  
! TSSOP-20 package (0.65 mm pitch)  
Applications  
! Pager  
! Wireless mouse  
! Two-way car alarm system  
Revision C  
Page 1  
October 2000  
RX3141  
the wireless IC company  
Block Diagram and Pin Assignment  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
MIX  
IN  
VSS  
REG  
OUT  
REG  
CON  
ALM  
FSK  
OUT  
CHA  
RGE  
BS  
LPF  
OUT  
LPF  
IN  
LOW  
BATTERY  
ALARM  
CHARGE/  
DISCHARGE  
CIRCUIT  
1.0 V  
1-BIT  
COMPARATOR  
REGULATOR  
MIXER  
QUAD  
DETECTOR  
OSCILLATOR  
RSSI  
IFAMP  
DEC  
AF  
OSC  
IN  
OSC  
OUT  
2
MIX  
OUT  
FSK  
REF  
RSSI  
10  
QUAD OUT  
VCC  
IFIN  
5
1
3
4
6
7
8 9  
Revision C  
Page 2  
October 2000  
RX3141  
the wireless IC company  
Package and Pin Assignment: 20L, TSSOP  
OSCIN  
MIXIN  
OSCOUT  
MIXOUT  
VCC  
VSS  
REGOUT  
REGCON  
ALM  
IFIN  
DEC  
FSKOUT  
FSKREF  
QUAD  
AFOUT  
RSSI  
CHARGE  
BS  
LPFOUT  
LPFIN  
Dimensions in mm  
Dimensions in inch  
Symbols  
MIN.  
---  
NOM.  
---  
MAX.  
1.20  
0.15  
1.05  
0.30  
0.20  
6.60  
---  
MIN.  
---  
NOM.  
---  
MAX.  
0.048  
0.006  
0.041  
0.012  
0.008  
0.260  
---  
A
A1  
A2  
b
0.05  
0.80  
0.19  
0.09  
6.40  
---  
---  
0.002  
0.031  
0.007  
0.004  
0.252  
---  
---  
1.00  
---  
0.039  
---  
C
---  
---  
D
E
6.50  
6.40  
4.40  
0.65  
0.60  
---  
0.256  
0.252  
0.173  
0.026  
0.024  
---  
E1  
e
4.30  
---  
4.50  
---  
0.169  
---  
0.177  
---  
L
0.45  
---  
0.75  
0.10  
8°  
0.018  
---  
0.030  
0.004  
8°  
y
θ
0°  
---  
0°  
---  
Revision C  
Page 3  
October 2000  
RX3141  
the wireless IC company  
Pin Descriptions  
Number  
Name  
OSCIN  
OSCOUT  
MIXOUT  
VCC  
I/O  
Description  
1
2
I
Oscillator input (base)  
O
Oscillator output (emitter)  
3
O
Mixer output (2 KΩ output impedance)  
Nominal 1.4 V supply  
4
POWER  
5
IFIN  
I
I
IF amplifier input (2 KΩ input impedance)  
IF amplifier de-coupling capacitor connection  
1-bit comparator reference input (requires external capacitor)  
Quadrature FM demodulator input  
Quadrature FM demodulator output  
RSSI voltage output  
6
DEC  
7
FSKREF  
QUAD  
AFOUT  
RSSI  
I
8
I
9
O
O
I
10  
11  
12  
LPFIN  
LPFOUT  
LPF operational amplifier input  
O
LPF operational amplifier output  
Two-state logic input to control receiver power up/down.  
(BS = high = normal operation; BS = low = stand-by mode)  
13  
14  
BS  
I
I
Two-state logic input to control charge-discharge circuit.  
(CHARGE = high = fast charge; CHARGE = low = slow charge)  
CHARGE  
15  
16  
17  
18  
19  
20  
FSKOUT  
ALM  
O
Open collector NRZ comparator output (requires pull-up resistor)  
Open collector low battery alarm output (requires pull-up resistor)  
O
REGCON  
REGOUT  
VSS  
O
1.0 V regulator control output for connection to external PNP base  
1.0 V regulator input for connection to external PNP collector  
Ground  
I
GND  
I
MIXIN  
Mixer input (5 KΩ input impedance)  
Revision C  
Page 4  
October 2000  
RX3141  
the wireless IC company  
Absolute Maximum Ratings  
VSS = 0 V  
Parameter  
Symbol  
VCC  
Rating  
VSS – 0.3 to VSS + 3.5  
–30 to 85  
Unit  
V
Supply voltage  
TOPR  
TSTG  
TSLD  
tSLD  
Operating temperature range  
Storage temperature range  
Soldering temperature range  
Soldering time range  
°C  
°C  
°C  
s
–55 to 150  
255  
10  
Recommended Operating Conditions  
VSS = 0 V  
Value  
Parameter  
Symbol  
Unit  
min.  
1.1  
typ.  
max.  
1.6  
VCC1  
fMIXIN  
TA  
Supply voltage range  
MIXIN input frequency  
Operating temperature  
1.35  
V
50  
MHz  
–10  
25  
60  
°C  
Revision C  
Page 5  
October 2000  
RX3141  
the wireless IC company  
Electrical Characteristics  
(VCC = 1.4 V, VSS = 0 V, TA = 25 °C, BS = high unless otherwise noted)  
Value  
typ.  
Parameter  
Symbol  
Condition  
Unit  
min.  
max.  
ICC,total  
Quiescent current consumption  
Standby current consumption  
1.2  
1.7  
5
mA  
ICC,standby  
VBS = 0 V  
µA  
measured after 455 KHz  
ceramic filter  
GC  
Mixer conversion gain  
9
12.5  
16  
dB  
Mixer input intermodulation intercept point  
Mixer input resistance  
Mixer output resistance  
IF amplifier input resistance  
S/N ratio 1  
IIP3  
Rin,MIX  
Rout,MIX  
Rin,IF  
–10  
5
dBm  
KΩ  
2
KΩ  
2
KΩ  
dB  
SN1  
–53 dBm at MIXIN  
–53 dBm at IFIN  
–91 dBm at IFIN  
–53 dBm at IFIN  
63  
63  
25  
45  
S/N ratio 2  
SN2  
dB  
S/N ratio 3  
SN3  
dB  
mVrms  
Demodulation output level  
VOD  
–53 dBm at IFIN,  
AM=30 %  
AM rejection ratio  
AMR  
50  
dB  
FSK output duty ratio  
DR  
VALM  
40  
50  
1.1  
1.0  
0.60  
82  
60  
%
V
Low battery alarm threshold voltage  
Regulator output voltage  
RSSI output voltage  
1.05  
0.95  
0.45  
1.15  
1.05  
0.80  
VREGOUT  
VRSSI  
430 Ω load resistor  
V
–53 dBm at IFIN  
V
RRSSI  
RSSI output resistance  
KΩ  
VFSKREF = 0 V,  
ICH  
Charging/discharging current  
35  
70  
110  
µA  
VLPFOUT = 0.18 V  
IOH,ALM  
ALM logic HIGH output current  
ALM logic LOW output voltage  
2
µA  
VOL,ALM  
0.4  
V
IOH,FSK-  
OUT  
FSKOUT logic HIGH output current  
FSKOUT logic LOW output voltage  
2
µA  
VOL,FSK-  
OUT  
0.4  
V
Revision C  
Page 6  
October 2000  
RX3141  
the wireless IC company  
Functional Description  
The RX3141 IF receiver IC incorporates a mixer, crystal-based local oscillator, IF ampli-  
fier, quadrature FM demodulator, bit-rate filter, and 1-bit comparator and is capable of  
demodulating 2-level FSK input signals. In addition, 1.0 V regulator and 1.1 V low bat-  
tery alarm functions are provided.  
Power-down Function  
The entire receiver IC may be powered up and down through the control of the BS input  
(pin 13). During power down operation, the quiescent current consumption of the IC  
drops to approximately 0 A. The high input impedance of the BS pin allows for direct  
µ
interfacing with the CMOS output of an off-chip microcontroller.  
RSSI Function  
A dc potential, which corresponds to the input signal level received at the IFIN input (pin  
5), is developed across an internal 82 K resistor. This potential is a measure of the  
Ω
received signal strength and is provided at the RSSI output (pin 10).  
Charge/Discharge Circuitry  
The function of the charge/discharge circuitry is for both fast and slow charging/discharg-  
ing of the capacitor used for storing the voltage reference level of the FSKREF pin. The  
CHARGE input (pin 14) should be enabled (CHARGE = high = fast charge) immediately  
after transition of the receiver IC from power-down to normal operation in order to reduce  
the charging/discharging time for coarse adjustment of the FSKREF voltage to the appro-  
priate dc level (i.e. dc level of the LPFOUT pin) and consequently to minimize the errone-  
ous output of the 1-bit comparator. During actual data reception, the CHARGE pin should  
be set to low (CHARGE = low = slow charge) for fine adjustment of the FSKREF voltage.  
1-bit Comparator  
The integrated 1-bit comparator operates as a data slicer and “squares up” the bit-rate fil-  
tered output from the quadrature demodulator. The decision threshold voltage level for  
the 1-bit comparator is stored on an external capacitor connected to the FSKREF pin.  
Regulator  
The on-chip 1.0 V regulator requires a suitable off-chip PNP transistor to achieve regula-  
tion. The external PNP transistor should have an h > 200 for V  
0. 1 V .  
≥
CE  
FE  
Low Battery Alarm  
The low battery alarm output, ALM, is normally low, but rises to 1.1 V ( VCC) when the  
≈
VCC voltage falls below approximately 1.1 V.  
Revision C  
Page 7  
October 2000  
RX3141  
the wireless IC company  
Typical Performance Characteristics  
2
1.8  
1.6  
1.4  
1.2  
1
0
-5  
-10  
-15  
-20  
VCC=1.4 V  
T=300 K  
0.8  
VCC=1.4 V  
0.6  
IFIN=-53 dBm  
T=300 K  
CHARGE=H  
fmod=600 Hz  
0.4  
f=4 KHz  
∆
0 dB=158 mVpk-pk  
0.2  
0
0
1
2
3
440  
445  
450  
IFIN (KHz)  
455  
460  
465  
470  
VCC (V)  
1.4  
0.4  
0.35  
0.3  
1.2  
1
0.25  
0.2  
0.8  
0.6  
0.4  
0.2  
0
VCC=1.4 V  
T=300 K  
0.15  
0.1  
IF=-53 dBm  
fmod=600 Hz  
0.05  
0
f=4 KHz  
∆
0
0.5  
1
1.5  
2
2.5  
3
440  
445  
450  
455  
460  
465  
470  
VCC (V)  
IFIN (KHz)  
80  
60  
40  
20  
0
1.4  
1.2  
VCC=1.4 V  
T=300 K  
MIXIN=21.4 MHz  
1
0.8  
0.6  
0.4  
0.2  
0
-20  
VCC=1.4 V  
T=300 K  
-40  
-60  
-80  
0
0.1  
0.2  
0.3  
0.4  
0.5  
-110 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10  
0
FSKREF (V)  
M IXIN (dBm)  
Revision C  
Page 8  
October 2000  
RX3141  
the wireless IC company  
Test Circuit  
VREGOUT  
VALM  
VFSKOUT  
VOD  
0.01 µF  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
VSS  
REG  
OUT  
REG  
CON  
ALM  
FSK  
OUT  
BS  
MIX  
IN  
CHA  
RGE  
LPF  
OUT  
LPF  
IN  
LOW  
BATTERY  
ALARM  
CHARGE/  
DISCHARGE  
CIRCUIT  
1.0 V  
1-BIT  
COMPARATOR  
REGULATOR  
MIXER  
QUAD  
DETECTOR  
OSCILLATOR  
RSSI  
IFAMP  
DEC  
AF  
OUT  
OSC  
OUT  
2
MIX  
OUT  
FSK  
REF  
OSC  
IN  
RSSI  
10  
QUAD  
VCC  
IFIN  
5
1
3
4
6
7
8
9
VCC  
56 pF  
VRSSI  
22 KΩ  
39 pF  
GC  
MURATA  
CFVM455E  
VCC  
Revision C  
Page 9  
October 2000  
RX3141  
the wireless IC company  
Application Circuit  
OSCIN  
OSCOUT  
MIXOUT  
VCC  
MIXIN  
VSS  
1st IF  
amplifier  
LNA  
1st mixer  
REGOUT  
REGCON  
ALM  
IFIN  
DEC  
FSKOUT  
CHARGE  
BS  
FSKREF  
QUAD  
AFOUT  
RSSI  
Frequency  
multiplier (×2,3)  
LPFOUT  
LPFIN  
1st LO  
XIN  
XOUT  
VDD2  
DB  
TEST  
NC  
RAM  
ROM  
OPR  
LE  
DO  
DATA  
CLK  
LD  
CPU  
Decoder  
VSS  
FIN  
VDD1  
NC  
LCD driver  
LCD  
Driver  
DC/DC  
converter  
Revision C  
Page 10  
October 2000  
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