TDA8050A

Features:

· Programmable gain
· PLL controlled carrier frequency
· 3-wire transmission bus
· 5 V supply voltage.

Application

· QPSK modulation.


Pinout




Specifications

SYMBOL	PARAMETER	MIN.	MAX.	UNIT
VCC	supply voltage	-0.3	+6.0	V
tsc	short-circuit time (every pin to VCC or GND)	-	10	S
VMAX	voltage on all pins except BUF_OUT, BUF_OUTC and TUNE_CONV	-0.3	VCC	V
V(tune)	output tuning voltage	-0.3	+30	V
VO(buf)	output buffer voltage on pins BUF_OUTand BUF_OUTC	-	10	V
Ptot	maximum power dissipation	-	940	mW
Tamb	Operating ambient temperature	0	70
Tstg	storage temperature	-40	+150
Tj(max)	maximum junction temperature	-	150

Description

The Quadrature Phase Shift Keying (QPSK) transmitter TDA8050A is a monolithic bipolar IC dedicated to quadrature modulation of the I and Q signals. It includes:
   · Two double balanced mixers
   · A balanced voltage controlled oscillator (VCO) with 0 to 90 degrees signal generation for modulation
   · A phase locked loop (PLL) for IF frequency control
   · A conversion mixer
   · A PLL for RF frequency control
   · A gain controlled output amplifier
   · A 3-wire bus and an output buffer.

Two PLLs are incorporated, the first PLL includes:
   · A fixed main divider
   · A crystal oscillator and its programmable reference divider
   · A phase/frequency detector, combined with a fixed charge pump.

The second PLL includes:
   · A divide-by-four preamplifier
   · A 12-bit programmable divider
   · A crystal oscillator and its programmable reference divider
   · A phase/frequency detector, combined with a programmable charge pump which drives the tuning 
       amplifier,  including 30 V output.