Audio ASSP | LV25500PQA
调频 (FM) 多路复用广播接收调谐器
概览
LV25500PLF 是一款车内调频 (FM) 多路复用广播仅接收调谐器集成电路，用于调频 (FM) 调谐器、PLL 和 RDS 解调器单芯片。安森美半导体的独特技术能够减少传统调谐器集成电路实现高频率所需的大量外部组件，如线圈、陶瓷滤波器和变容二极管。可以组成小型调频 (FM) 多调谐器，也可安装在 PND 等应用中，包括 AVN。
- No need for adjustment work.
- The AF search processing on the main tuner side is unnecessary according to using with the main tuner together.
- The high sensitivity reception and the high strong input tolerance are united by LNA built into equipped with the WIDE-AGC function.
- The third and fifth high harmonic rejection type mixers of a local oscillation are adopted.
- The switch of UPPER/LOWER of a local oscillation and IF-BPF of injection is possible when the image signal is detected.
- The complex BPF of the image attenuation type is built into.
- IF-BPF is made built-in by LOW-IF frequency (IF = 575 kHz) adoption.
- Dynamic range of S meter is wide.
- S meter tuning-system is adopted.
- The DLL demodulation method is adopted for FM demodulation circuit.
- LPF for the carrier removal is built into.
- S meter level, the adjacent obstruction level, and the multipath can be detected and read by way of I2C BUS.
- BPF (57 kHz) for the BPSK detection is built into.
- It becomes easy to miniaturize the tuner set with built-in the RDS demodulator.
- 36.8MHz is adopted for the crystal oscillation frequency.
- The number of external parts is little.
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