TDA8050A Datasheet, PDF (2/28 Pages) NXP Semiconductors – QPSK transmitter

Philips Semiconductors
QPSK transmitter
Product specification
TDA8050A
FEATURES
• Programmable gain
• PLL controlled carrier frequency
• 3-wire transmission bus
• 5 V supply voltage.
APPLICATIONS
• QPSK modulation.
GENERAL DESCRIPTION
The Quadrature Phase Shift Keying (QPSK) transmitter IC
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.
QUICK REFERENCE DATA
SYMBOL
V_CC
f_c
V_o(max)
f_xtal
f_ref(MOD)
f_step
T_amb
PARAMETER
supply voltage
output centre frequency
maximum output level
crystal frequency
reference frequency for modulator synthesizer
frequency step size for converter synthesizer
ambient temperature
MIN.
4.75
5
−
1
−
100
0
TYP.
5.00
−
55
−
250
−
−
MAX.
5.25
65
−
4
−
500
70
UNIT
V
MHz
dBmV
MHz
kHz
kHz
°C
ORDERING INFORMATION
TYPE
NUMBER
TDA8050A
NAME
SO32
PACKAGE
DESCRIPTION
plastic small outline package; 32 leads; body width 7.5 mm
VERSION
SOT287-1
1999 Nov 05
2