Download: Wide band IF detector for RF remote control units BH4126FV
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 3) Equipped with a battery power saving function. detection circuits. 4) Fast RSSI response. 2) Can be operated at mixer input frequencies ranging 5) High FM detection sensitivity. (21.2mV / kHz) from 20MHz to 300MHz. !Block diagram VCC IF input FM detector RSSI output IF output 16 15 14 13 12 11 10 9 VCC Quadra...
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Wide band IF detector for RF remote
control unitsBH4126FV
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 3) Equipped with a battery power saving function. detection circuits. 4) Fast RSSI response. 2) Can be operated at mixer input frequencies ranging 5) High FM detection sensitivity. (21.2mV / kHz) from 20MHz to 300MHz., !Block diagramVCC
IF input FM detector RSSI output IF output 16 15 14 13 12 11 10 9VCC
QuadratureRSSI
DET.IF
Local OSC.VCC
12345678Local Battery save VCC !Absolute maximum ratings (Ta=25°C, for measurement circuit) Parameter Symbol Limits Unit Power supply voltage VCC 7.0 V Power dissipation PD 350 *1 mW Storage temperature Tstg -55~+125 ˚C *1 Reduced by 3.5 mW for each increase in Ta of 1˚C over 25˚C. !Operating range Parameter Symbol Limits Unit Operating power supply voltage VCC 2.3~5.5 V Operating temperature Topr -40~+85 ˚C, !Pin descriptions Pin No. Function Internal peripheral circuit DC voltage(V) Local oscillator pin (base)VCC
Connect crystal resonator 1 and capacitor VCC - 0.6 Local oscillator pin (emitter) 2 To MIXER 2 Connect capacitor or input local signal VCC from external oscillator Battery save pin "Pin 3 voltage" ≤ 0.2 : Battery save 30k2V≤ "Pin 3 voltage" ≤ VCC : Active 3 - Mixer output pin VCC Connect ceramic filter Output impedance: 330Ω44VCC - 1.5 GND pin GND for IF stages and FM detection stages 5 GND 5k, Pin No. Function Internal peripheral circuit DC voltage (V) IF amplifier bypass pin Connect capacitor VCC 6 VCC IF amplifier input pin 170 Connect ceramic filter 7 Input impedance: 330Ω 7 VCC VCC pin 1 Vcc for MIX stages and IF front stage 8 VCC VCC pin 2 Vcc for IF rear stage and FM detection stage 9 VCC RSSI output pin VCC Connect capacitor 10 10 0.1 IF amplifier output pin VCC Pins 11 and 12 are opposite-phase output 11 VCC - 1 15k 3k, Pin No. Function Internal peripheral circuit DC voltage(V) Discriminator pin VCC Connect phase shift coil or ceramic discriminator 13 13 VCC FM demodulation signal output pinVCC
Output impedance is 360Ω 14 330 0.9 GND pin GND for MIX stage 15 GND Mixer pinVCC
Connect first IF signal from DC cutoff 2.4k 16 16 1.0 2.4k, !Electrical characteristics (unless otherwise noted, Ta=25°C, VCC=3.0V) _ Signal source : fIN (MIX) = 248.45MHz, fIN (LO) = 237.75MHz, 100dBµV _ AC level to be indicated by termination Parameter Symbol Min. Typ. Max. Unit Conditions Quiescent current IQ 4.4 5.5 6.6 mA With local oscillation OFF Battery save quiescent current IQ (BS) - 0 5 µA VTH-H 2 - VCC V Active Battery save function input voltage VTH-L GND - 0.2 V Battery save 〈 MIX - Oscillator section 〉 Mixer operating frequency fMIX 20 - 300 MHz Mixer conversion gain GVC 16 20 24 dB VIN (MIX) = 60dBµV -1dB compression output level VOM - 103 - dBµV 3rd order intercept point IP3 - 110 - dBµV f1=248.75MHz,f2=249.05MHz Noise figure NF - 9.7 - dB LC matching input Mixer input admittance YIN (MIX) - 1.25+j7.47 - ms f=248.45MHz Mixer output resistance RO (MIX) - 330 - Ω Local oscillator operating frequency fLO 20 - 120 MHz Local input level VIN (LO) 95 100 105 dBµV Local input admittance YIN (LO) - 1.36+j9.72 - ms f=237.75MHz,Signal source : fIN (MIX) = 248.45MHz, fIN (LO) = 237.75MHz,100dBµV, fIN (IF) = 10.7MHz; AC level to be indicated by termination
Parameter Symbol Min. Typ. Max. Unit Conditions 〈 IF section 〉 IF operating frequency fIF 4 - 15 MHz IF amplifier gain GV - 75 - dB IF input resistance RIN (IF) - 330 - Ω IF output level VOIF 0.4 0.5 0.6 VP-P VIN (IF) = 80dBµV IF duty ratio DR 40 50 60 % VIN (IF) = 80dBµV, CL = 10pF 〈 RSSI section 〉 Output voltage 1 VRSSI1 - 0.15 0.4 V No input Output voltage 2 VRSSI2 1.0 1.2 1.4 V VIN (IF) = 70dBµV Output voltage 3 VRSSI3 1.8 2.0 2.2 V VIN (IF) = 100dBµV Dynamic range DR - 70 - dB Output resistance RO (RSSI) 12 15 18 kΩ Rise time at power on TON - 20 - µs CL = 100pF, VIN (MIX) = 60dBµV Fall time at power off TOFF - 5 - µs CL = 100pF, VIN (MIX) = 60dBµV RSSI rise time TR - 9 - µs CL = 100pF, VIN (MIX) = 60dBµV RSSI fall time TF - 11 - µs CL = 100pF, VIN (MIX) = 60dBµVSignal source : fIN (IF) =10.7MHz, ∆f=±10kHz dev, fm=1kHz; AC level to be indicated by termination
Parameter Symbol Min. Typ. Max. Unit Conditions 〈 Detector unit 〉 Detection sensitivity SDET - 21.2 - mV / kHz VIN (IF) = 80dBµV Detection output level VO 110 150 195 mVrms VIN (IF) = 80dBµV Detection frequency fDET - 100 - kHz VIN (IF) = 80dBµV 12 dB SINAD sensitivity S (12dB) 12 16 20 dBµV S / N ratio S / N 40 48 - dB VIN (IF) = 80dBµV AM rejection ratio AMR - 40 - dB VIN (IF) = 80dBµV, AM = 30%, !Measurement circuit CL=10pF (Includes the capacity of the measurement system.) T1: 4162-JPS-024 (SUMIDA) 30kHz LPF T1 V6 RIN=100kΩ V6 V5V~ V V
SG1 ~ ~ fIN=248.45MHz VIN=60dBµV 3p V V4 1000p 16 15 14 13 12 11 10 9VCC
Quadrature RSSI DET.IF
Local OSC.VCC
12345678SW1 V1 V SW2 SW322112A I1
V2 V 1.9V 0.3V SW4V 2 VCCV3~
SG3 SG2 fIN=10.7MHz fIN=237.75MHz VIN=100dBµV Units Resistance : Ω Capacitance : µVFig. 1
51 3k 1000p 4.7k 1000p 62 0.01CL
0.01CL
100p 0.1, !Application example Without FM detector.VCC
IF OUT Open 14 13 12 T1: 4162-JPS-024 (SUMIDA)VCC
FM Detector Out T1 RSSI IF OUT fIN=248.45MHz 3p 1000p 16 15 14 13 12 11 10 9VCC
Quadrature DET. RSSIIF
Local OSC.VCC
1234567812BS fLO=237.75MHz VIN=100dBµV Units Resistance : Ω Capacitance : µFFig. 2
1000p 0.01 100p 0.1 0.1, !External dimensions (Units: mm) 5.0±0.2 169180.65 0.22±0.1 0.3Min. 0.1 SSOP - B16 1.15±0.1 6.4±0.3 0.1 4.4±0.2 0.15±0.1]15
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