U4255BM-M Datasheet, PDF (1/32 Pages) ATMEL Corporation – AM / FM RECEIVER IC

Features
• FM Double-conversion System
• Integrated Second IF Filter with Software-controlled Bandwidth
• Completely Integrated FM Demodulator
• Soft Mute and Multipath Noise Cancellation
• Receiving Condition Analyzer
• AM Up/Down-conversion System
• AM Preamplifier with AGC and Stereo Capability
• 3-wire Bus Controlled
• Search Stop Signal Generation for AM and FM
• Automatic Alignment Possible
Electrostatic sensitive device.
Observe precautions for handling.
Description
The U4255BM-M is a highly integrated AM/FM front-end circuit manufactured using
Atmel’s advanced BICMOS technology. It represents a complete, automatically adjust-
able AM/FM front end, containing a double-conversion system for FM and an
up/down-conversion receiver for AM with IF1 = 10.7 MHz and IF2 = 450 kHz. The
front end is suitable for digital or analog AF-signal processing. Together with the PLL
U4256BM, an automatically aligned high-performance AM/FM tuner can be built.
These ICs are dedicated for highly sophisticated car radio applications.
AM/FM
Receiver IC
U4255BM-M
Preliminary
Pin Configuration
Figure 1. Pinning SSO44
Rev. 4519C–AUDR–07/02
1