參數(shù)資料
型號： 935263935118
廠商： NXP SEMICONDUCTORS
元件分類： 調(diào)諧器
英文描述： 2-BAND, VIDEO TUNER, PDSO28
封裝： PLASTIC, SOT-341, SSOP-28
文件頁數(shù)： 17/48頁
文件大?。?/td> 242K
代理商： 935263935118
2000 Aug 02
24
Philips Semiconductors
Product specication
5 V mixers/oscillators and synthesizers for
cable TV and VCR 2-band tuners
TDA6502; TDA6502A;
TDA6503; TDA6503A
13 TEST AND APPLICATION INFORMATION
13.1
Test circuits
handbook, full pagewidth
FCE577
50
27
50
50
V
VHFIN
IFOUT
e
Vmeas
RMS
voltmeter
spectrum
analyzer
Vo
Vi
D.U.T.
V'meas
signal
source
Fig.12 Gain measurement in VHF band.
Zi >> 50 Vi =2 × Vmeas =80dBV
Vi =Vmeas +6dB =80dBV
Vo =V’meas ×
Gv = 20 log
50
27
+
50
-------------------
V
o
V
i
------
handbook, full pagewidth
FCE578
L1
C2
C1
PCB
plug
BNC
RIM-RIM
I1
C4
C3
PCB
RIM-RIM
I3
I2
(a)
(b)
Fig.13 Input circuit for optimum noise figure in VHF band.
(b) For fRF = 150 MHz:
mixer A frequency response measured = 150.3 MHz, loss = 1.3 dB
image suppression = 13 dB
C3 = 5 pF
C4 =25pF
l2 = 30 cm semi rigid RIM cable (33 dB/100 m, 50
and 96 pF/m).
l3 = 5 cm semi rigid RIM cable (33 dB/100 m, 50
and 96 pF/m).
(a) For fRF = 50 MHz:
mixer A frequency response measured = 57 MHz, loss = 0 dB
image suppression = 16 dB
C1 = 9 pF
C2 = 15 pF
L1 = 7 turns (
5.5 mm, wire = 0.5 mm)
l1 = 5 cm semi rigid RIM cable (33 dB/100 m, 50
and 96 pF/m).
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