View tda8050 n 4 datasheet:

INTEGRATED CIRCUITS DATA SHEET TDA8050 QPSK transmitter Product specification 1999 Dec 14 Supersedes data of 1999 Jun 21 File under Integrated Circuits, IC02 Philips Semiconductors Product specification QPSK transmitter TDA8050 FEATURES • PLL for RF frequency control • Gain controlled output amplifier • Programmable gain • 3-wire bus and an output buffer. • PLL controlled carrier frequency • 3-wire transmission bus Two PLLs are incorporated, the first PLL includes: • 5 V supply voltage. • Fixed main divider • Crystal oscillator and its programmable reference divider APPLICATIONS • Phase/frequency detector combined with a fixed charge • QPSK modulation. pump. The second PLL includes: GENERAL DESCRIPTION • Divide-by-four preamplifier The Quadrature Phase Shift Keyin