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RX3140 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 contained 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 RX3140 is a low power IF receiver IC which is fully compatible with the Toshiba TA31142 IC and is suitable for use as the second IF downconverter in double-conversion paging systems. The RX3140 is well-suited for POCSAG paging applications and incorporates 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.
Features
u u u u u u u u u u Extremely low power operation with power-down feature Built-in crystal oscillator for mixer local oscillator Mixer input frequency: 10 -- 50 MHz 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 SSOP-20 package (0.65 mm pitch)
Block Diagram
20
MIX IN
19
VSS
18
REG OUT
17
REG CON
16
ALM
15
FSK OUT
14
CHA RGE
13
BS
12
LPF OUT
11
LPF IN
1.0 V REGULATOR
LOW 1-BIT BATTERY COMPARATOR ALARM
CHARGE/ DISCHARGE CIRCUIT
MIXER
QUAD DETECTOR OSCILLATOR
IFAMP OSC IN OSC OUT MIX OUT FSK REF IF OUT AF OUT
VCC
IFIN
DEC
QUAD
1
2
3
4
5
6
7
8
9
10
Revision B
Page 1
May 2000
RX3140
the wireless IC company
Pin Descriptions
Number 1 2 3 4 5 6 Name OSCIN OSCOUT MIXOUT VCC IFIN DEC Description Oscillator input (base) Oscillator output (emitter) 14 Mixer output (2 K output impedance) Nominal 1.4 V supply IF amplifier input (2 K input impedance) IF amplifier de-coupling capacitor connection 1-bit comparator reference input (requires external capacitor) IF amplifier output Quadrature FM demodulator input Quadrature FM demodulator output LPF operational amplifier input LPF operational amplifier output Two-state logic input to control receiver power up/ down. (BS = high = normal operation; BS = low = stand-by mode) 18 19 20 REGOUT VSS MIXIN 1.0 V regulator input for connection to external PNP collector Ground Mixer input (5 K input impedance) 15 FSKOUT CHARGE Number Name Description Two-state logic input to control charge-discharge circuit. (CHARGE = high = fast charge; CHARGE = low = slow charge) Open collector NRZ comparator output (requires pull-up resistor) Open collector low battery alarm output (requires pullup resistor) 1.0 V regulator control output for connection to external PNP base
16
ALM
7 8 9 10 11 12
FSKREF IFOUT QUAD AFOUT LPFIN LPFOUT
17
REGCON
13
BS
Revision B
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May 2000
RX3140
the wireless IC company
Absolute Maximum Ratings
VSS = 0 V
Parameter Supply voltage Operating temperature range Storage temperature range Soldering temperature range Soldering time range Symbol VCC TOPR TSTG TSLD tSLD Rating VSS - 0.3 to VSS + 3.5 -30 to 85 -55 to 150 255 10 Unit V
C C C
s
Recommended Operating Conditions
VSS = 0 V
Value Parameter Supply voltage range MIXIN input frequency Operating temperature Symbol min. VCC fMIXIN TA -10 25 1.1 typ. 1.35 max. 1.6 50 60 V MHz Unit
C
Revision B
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May 2000
RX3140
the wireless IC company
Electrical Characteristics
(VCC = 1.4 V, VSS = 0 V, TA = 25 C, BS = high unless otherwise noted)
Value Parameter Quiescent current consumption Standby current consumption Mixer conversion gain Mixer output intermodulation intercept point Mixer input resistance Mixer output resistance IF amplifier input resistance S/N ratio 1 S/N ratio 2 S/N ratio 3 Demodulation output level AM rejection ratio FSK output duty ratio Low battery alarm threshold voltage Regulator output voltage Charging/discharging current ALM logic HIGH output current ALM logic LOW output voltage FSKOUT logic HIGH output current FSKOUT logic LOW output voltage Symbol ICC,total ICC,standby GC OIP3 Rin,MIX Rout,MIX Rin,IF SN1 SN2 SN3 VOD AMR DR VALM VREGOUT ICH IOH,ALM VOL,ALM IOH,FSKOUT
Condition min. typ. 1.1 VBS = 0 V measured after 455 KHz ceramic filter 9 12.5 -10 5 2 2 -53 dBm at MIXIN -53 dBm at IFIN -91 dBm at IFIN -53 dBm at IFIN -53 dBm at IFIN, AM=30 % 40 1.05 430 load resistor VFSKREF = 0 V, VLPFOUT = 0.18 V 0.95 35 63 63 25 45 50 50 1.1 1.0 70 60 1.15 1.05 110 2 0.4 2 0.4 max. 1.6 5 16
Unit mA A dB dBm K K K dB dB dB
mVrms
dB % V V A A V A V
VOL,FSKOUT
Revision B
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May 2000
RX3140
the wireless IC company
Functional Description
The RX3140 IF receiver IC incorporates a mixer, crystal-based local oscillator, IF amplifier, 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 battery 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 interfacing with the CMOS output of an off-chip microcontroller. Charge/Discharge Circuitry The function of the charge/discharge circuitry is for both fast and slow charging/discharging 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 appropriate dc level (i.e. dc level of the LPFOUT pin) and consequently to minimize the erroneous 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 filtered 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 regulation. The external PNP transistor should have an hFE > 200 for VCE 0.1 V . 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 B
Page 5
May 2000
RX3140
the wireless IC company
Typical Performance Characteristics
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Revision B
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May 2000
RX3140
the wireless IC company
Test Circuit
VREGOUT VALM 2SA1015GR 430 2.2 F VFSKOUT VCC VOD 68 K 560 pF 68 K 330 pF 68 K
51
100 K
100 K
1 nF
0.01 F
20
MIX IN
19
VSS
18
REG OUT
17
REG CON
16
ALM
15
FSK OUT
14
CHA RGE
13
BS
12
LPF OUT
11
LPF IN
1.0 V REGULATOR
LOW 1-BIT BATTERY COMPARATOR ALARM
CHARGE/ DISCHARGE CIRCUIT
MIXER
QUAD DETECTOR OSCILLATOR
IFAMP OSC IN VCC 22 K OSC OUT MIX OUT FSK REF IF OUT AF OUT
VCC
IFIN
DEC
QUAD
1
56 pF
2
3
0.1 F
4
VCC 10 F
5
0.1 F
6
10 F
7
8
22 pF
9
3.3 K
10
39 pF
GC MURATA CFVM455E
10 F VCC
Revision B
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May 2000
RX3140
the wireless IC company
Application Circuit
LNA
1st mixer
1st IF amplifier
OSCIN OSCOUT MIXOUT
MIXIN VSS REGOUT
+07
VCC IFIN DEC FSKREF Frequency multiplier (x2,3) IFOUT QUAD AFOUT
REGCON ALM FSKOUT CHARGE BS LPFOUT LPFIN
1st LO XIN XOUT TEST NC RAM ROM
+07
VDD2 DB DO VSS FIN VDD1
OPR LE DATA CLK LD NC
LCD driver
CPU
Decoder
Driver LCD DC/DC converter
Revision B
Page 8
May 2000

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