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BH4126FV
Communication ICs
Wide band IF detector for RF remote control units
BH4126FV
The BH4126FV is an IC equipped with internal mixer, IF amplifier, and FM detector circuits, developed for use with RF remote control units.
!Applications Keyless entry
!Features 1) Equipped with internal mixer, IF, RSSI, and FM detection circuits. 2) Can be operated at mixer input frequencies ranging from 20MHz to 300MHz.
3) Equipped with a battery power saving function. 4) Fast RSSI response. 5) High FM detection sensitivity. (21.2mV / kHz)
BH4126FV
Communication ICs
!Block diagram
VCC IF input FM detector output RSSI IF output
16
15
14
13
12
11
10
9
VCC
Quadrature DET.
RSSI
IF Local OSC.
VCC
1
2
3
4
5
6
7
8
Local
Battery save
VCC
!Absolute maximum ratings (Ta=25C, for measurement circuit)
Parameter Power supply voltage Power dissipation Storage temperature Symbol VCC PD Tstg Limits 7.0 350
*1
Unit V mW C
-55~+125
*1 Reduced by 3.5 mW for each increase in Ta of 1C over 25C.
!Operating range
Parameter Operating power supply voltage Operating temperature Symbol VCC Topr Limits 2.3~5.5 -40~+85 Unit V C
BH4126FV
Communication ICs
!Pin descriptions
Pin No. Function Local oscillator pin (base)
VCC
Internal peripheral circuit
DC voltage(V)
1
Connect crystal resonator and capacitor
5k
VCC - 0.6
1
Local oscillator pin (emitter)
2 To MIXER
2
Connect capacitor or input local signal from external oscillator
VCC
Battery save pin "Pin 3 voltage" 0.2 : Battery save
3 30k
3
2 V "Pin 3 voltage" VCC : Active
-
Mixer output pin Connect ceramic filter Output impedance: 330
VCC
270
4
4
VCC - 1.5
GND pin 5
GND for IF stages and FM detection stages GND
BH4126FV
Communication ICs
Pin No. Function IF amplifier bypass pin Connect capacitor 6
170 6 VCC
Internal peripheral circuit
DC voltage (V)
VCC
3k
IF amplifier input pin Connect ceramic filter Input impedance: 330 7
170 7
VCC
VCC pin 1 8
Vcc for MIX stages and IF front stage VCC
VCC pin 2 9
Vcc for IF rear stage and FM detection stage VCC
RSSI output pin Connect capacitor
VCC
10
10
0.1
15k
IF amplifier output pin Pins 11 and 12 are opposite-phase output 11
100 11
VCC
VCC - 1
12
BH4126FV
Communication ICs
Pin No. Function Discriminator pin Connect phase shift coil or ceramic discriminator
500
Internal peripheral circuit
VCC
DC voltage(V)
13
13
VCC
FM demodulation signal output pin Output impedance is 360
VCC
14
330 14
0.9
GND pin 15
GND for MIX stage GND
Mixer pin
VCC
Connect first IF signal from DC cutoff
16
2.4k 16 2.4k
1.0
BH4126FV
Communication ICs
!Electrical characteristics (unless otherwise noted, Ta=25C, VCC=3.0V) _ Signal source : fIN (MIX) = 248.45MHz, fIN (LO) = 237.75MHz, 100dBV _ AC level to be indicated by termination
Parameter
Quiescent current Battery save quiescent current Battery save function input voltage MIX - Oscillator section Mixer operating frequency Mixer conversion gain -1dB compression output level 3rd order intercept point Noise figure Mixer input admittance Mixer output resistance Local oscillator operating frequency Local input level Local input admittance
Symbol IQ IQ (BS) VTH-H VTH-L
Min. 4.4 2 GND
Typ. 5.5 0 -
Max. 6.6 5 VCC 0.2
Unit mA A V V Active
Conditions With local oscillation OFF
Battery save
fMIX GVC VOM IP3 NF YIN (MIX) RO (MIX) fLO VIN (LO) YIN (LO)
20 16 20 95 -
20 103 110 9.7 1.25+j7.47 330 100 1.36+j9.72
300 24 120 105 -
MHz dB dBV dBV dB ms MHz dBV ms f=237.75MHz f1=248.75MHz,f2=249.05MHz LC matching input f=248.45MHz VIN (MIX) = 60dBV
BH4126FV
Communication ICs
Signal source : fIN (MIX) = 248.45MHz, fIN (LO) = 237.75MHz,100dBV, fIN (IF) = 10.7MHz; AC level to be indicated by termination
Parameter IF section IF operating frequency IF amplifier gain IF input resistance IF output level IF duty ratio RSSI section Output voltage 1 Output voltage 2 Output voltage 3 Dynamic range Output resistance Rise time at power on Fall time at power off RSSI rise time RSSI fall time VRSSI1 VRSSI2 VRSSI3 DR RO (RSSI) TON TOFF TR TF 1.0 1.8 12 0.15 1.2 2.0 70 15 20 5 9 11 0.4 1.4 2.2 18 V V V dB k s s s s CL = 100pF, VIN (MIX) = 60dBV CL = 100pF, VIN (MIX) = 60dBV CL = 100pF, VIN (MIX) = 60dBV CL = 100pF, VIN (MIX) = 60dBV No input VIN (IF) = 70dBV VIN (IF) = 100dBV fIF GV RIN (IF) VOIF DR 4 0.4 40 75 330 0.5 50 15 0.6 60 MHz dB VP-P % VIN (IF) = 80dBV VIN (IF) = 80dBV, CL = 10pF Symbol Min. Typ. Max. Unit Conditions
Signal source : fIN (IF) =10.7MHz, f=10kHz dev, fm=1kHz; AC level to be indicated by termination
Parameter Detector unit Detection sensitivity Detection output level Detection frequency 12 dB SINAD sensitivity S / N ratio AM rejection ratio SDET VO fDET S (12dB) S/N AMR 110 12 40 21.2 150 100 16 48 40 195 20 mV / kHz VIN (IF) = 80dBV mVrms kHz dBV dB dB VIN (IF) = 80dBV VIN (IF) = 80dBV, AM = 30% VIN (IF) = 80dBV VIN (IF) = 80dBV Symbol Min. Typ. Max. Unit Conditions
BH4126FV
Communication ICs
!Measurement circuit
CL=10pF (Includes the capacity of the measurement system.) T1: 4162-JPS-024 (SUMIDA)
V6
30kHz LPF
T1 V6 V5
4.7k
V ~
SG1 fIN=248.45MHz VIN=60dBV
RIN=100k
CL
CL 100p
V ~
3p
V ~
V
V4 10 9 VCC
1000p
51
16
15
14
13
12
11
Quadrature DET.
RSSI
IF Local OSC.
VCC 1 2 3 4 5 6 7 8
0.01
V1
V
2
SW1 SW2 2 1 1 2 SW3
1
0.1
1
1000p
A
10
I1
3k
V2
V
1.9V 0.3V
SW4
1000p
V ~
V3
0.01
2
VCC
SG2 fIN=237.75MHz VIN=100dBV
SG3 fIN=10.7MHz
51
62
Units Resistance : Capacitance : V
Fig. 1
BH4126FV
Communication ICs
!Application example
Without FM detector.
VCC Open 14 13 12 IF OUT
T1: 4162-JPS-024 (SUMIDA) VCC FM Detector Out T1
10
RSSI IF OUT
100p
fIN=248.45MHz 3p 1000p 16 15 14 13 12 11
10
9 VCC
Quadrature DET.
RSSI
IF Local OSC.
VCC 1 2 3 4 5 6 7 8
0.01
1
2
1000p
BS
fLO=237.75MHz VIN=100dBV
Units Resistance : Capacitance : F
Fig. 2
0.1
0.1
BH4126FV
Communication ICs
!External dimensions (Units: mm)
5.00.2 16 9
6.40.3
4.40.2
1.150.1
1
8
0.1
0.65
0.220.1
0.3Min. 0.1
SSOP - B16
0.150.1

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