SAA1057 Description
The SAA1057 is a single chip frequency synthesizer IC in I2L technology, which performs all the tuning functions of a PLL radio tuning system. The IC is applicable to all types of radio receivers, e.g. car radios, hi-fi radios and portable radios.
SAA1057 Key Features
- On-chip prescaler with up to 120 MHz input frequency
- On-chip AM and FM input amplifiers with high sensitivity (30 mV and 10 mV respectively)
- Low current drain (typically 16 mA for AM and 20 mA for FM) over a wide supply voltage range (3,6 V to 12 V)
- On-chip programmable current amplifier (charge pump) to adjust the loop gain
- Only one reference frequency for both AM and FM
- High signal purity due to a sample and hold phase detector for the in-lock condition
- High tuning speed due to a powerful digital memory phase detector during the out-lock condition
- Tuning steps for AM are: 1 kHz or 1,25 kHz for a VCO frequency range of 512 kHz to 32 MHz
- Tuning steps for FM are: 10 kHz or 12,5 kHz for a VCO frequency range of 70 MHz to 120 MHz
- Serial 3-line bus interface to a microputer