TDA8050A データシートの表示（PDF） - Philips Electronics
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TDA8050A Datasheet PDF : 28 Pages
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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
VCC
fc
Vo(max)
fxtal
fref(MOD)
fstep
Tamb
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
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