ROHM BH4127

Communication ICs
IF detector IC for 900MHz spread
spectrum cordless phones
BH4127FV
The BH4127FV is a mixer, IF amplifier, and FM detector IC developed for use with 900MHz spread spectrum cordless
phones
Applications
900MHz spread spectrum cordless phones
Features
1) Built-in mixer circuit, IF circuit, RSSI circuit, and FM
detector circuit.
2) Operates at mixer input frequencies ranging from 20
to 300 MHz.
3) Equipped with a battery save function.
4) FM detector circuit demodulates up to ±750kHzdev.
5) FM detector circuit demodulates up to 2.6Mbps.
Absolute maximum ratings (Ta = 25C, with the measurement circuit)
Recommended operating conditions
535
Communication ICs
Block diagram
536
Communication ICs
BH4127FV
Pin descriptions
537
Communication ICs
538
BH4127FV
Communication ICs
BH4127FV
Electrical characteristics (unless otherwise noted, Ta = 25C, VCC = 3.0V)
Signal source: fIN (MIX) = 254.4MHz, fIN (LO) = 243.2MHz, 100dBµV, fIN (IF) = 11.2MHz
AC level to be indicated by termination
539
Communication ICs
Signal source: fIN (IF) = 11.2MHz, ∆f = ±100kHz dev, fm = 1kHz
AC level to be indicated by termination
540
BH4127FV
Communication ICs
BH4127FV
Measurement circuit
541
Communication ICs
Application example
542
BH4127FV
Communication ICs
BH4127FV
External dimensions (Units: mm)
543