Narrowband FM IF integrated circuit, 1st and 2nd IF amplifier, 10.7 or 45 MHz input, 2μV sensitivity, second conversion mixer, second IF LO, second IF amplifier for example 455KHz, NBFM, quadrature discriminator, AFC output, etc..., supply voltage 6-9V, SO-20L SMD package
(Note: similar to MC3357, improved version with a limiter stage in addition but not pin compatible)