TDA8261TW Datasheet, PDF (14/22 Pages) NXP Semiconductors – Satellite Zero-IF QPSK/8PSK downconverter with PLL synthesizer

Philips Semiconductors
Satellite Zero-IF QPSK/8PSK
downconverter with PLL synthesizer
Product specification
TDA8261TW
handbook, full pagewidth
RF SIGNAL ^{wanted signal}
GENERATOR
RF SIGNAL ^{unwanted signal}
GENERATOR
ANZAC
TDA8261TW
SPECTRUM
ANALYSER
MBL860
Fig.8 Measurement method for pulling sensitivity.
Table 9 Test signal conditions for pulling measurements
SIGNAL
3/4LO test
wanted
unwanted
local oscillator
5/4LO test
wanted
unwanted
local oscillator
FREQUENCY
f_w = 2161 MHz
f_uw = 1613 MHz
f_lo = 2150 MHz
f_w = 1761 MHz
f_uw = 2188 MHz
f_lo = 1750 MHz
LEVEL
−10 dBm
−2 dBm
−
−10 dBm
−2 dBm
−
REMARK
f_w = f_lo + 11 MHz
f_uw = f_lo × 3/4 + 500 kHz
−
f_w = f_lo + 11 MHz
f_uw = f_lo × 5/4 + 500 kHz
−
The level of the wanted and unwanted signal mentioned in the table are measured at the outputs of the RF signal
generators. The sensitivity to pulling is measured in baseband by the difference expressed in dB (∆) between the level
of the wanted signal and the spurious generated by pulling. The ANZAC reference is HH128.
handbook, halfpage
∆Vsignal
2004 Dec 02
11
wanted
signal
11.5
spurious
signal
f (MHz)
MGU794
Fig.9 Base band spectrum.
14