TSA5522

The TSA5522 is a single chip PLL frequency synthesizer designed for TV and VCR tuning systems. The circuit consists of a divide-by-eight prescaler with its own
preamplifier, a 15-bit programmable divider, a crystal oscillator and its programmable reference divider and a phase/frequency detector combined with a charge-pump which drives the tuning amplifier, including 33 V output.

Three high-current PNP band switch TSA5522 buffers are provided for band switching together with four open-collector NPN outputs (only one open-collector output on 16-pin devices). These ports can also be used as input ports [one Analog-to Digital Converter (ADC) and three general purpose I/O ports (not available on 16-pin devices)]. An output is provided to control a Philips mixer/oscillator IC in combination with the PNP buffers state.

Depending on the reference divider ratio (512, 640 or 1024), the phase comparator operates at 3.90625 kHz, 6.25 kHz or 7.8125 kHz with a 4 MHz crystal. The LOCK detector bit FL is set to logic 1 when the loop is locked and is read on the SDA line (status byte) during a read operation.

The ADC TSA5522 is available for digital AFC control. The ADC code is read during a read operation on the I2C-bus. The ADC input is combined with the port P6. In the TEST mode, this port is also used as a TEST output for f_ref and 1/2fdiv (see Table 4).