參數(shù)資料
型號: TDA9917HW/12/C1
廠商: NXP SEMICONDUCTORS
元件分類: ADC
英文描述: 1-CH 8-BIT RESISTANCE LADDER ADC, PARALLEL ACCESS, PQFP48
封裝: 7 X 7 MM, 1.00 MM HEIGHT, PLASTIC, MS-026, SOT545-2, QFP-48
文件頁數(shù): 20/20頁
文件大?。?/td> 120K
代理商: TDA9917HW/12/C1
TA8132ANG/AFG,TA2012NG/FG
2004-10-12
9
5. AM local oscillator buffer output
The output impedance of AM local oscillator buffer output pin (pin(4)) is 750 (typ.) (cf.P.3)
It is possible to reduce the output level to add the resistance between the pin(4) and VCC line. The signal
waveform is the rectangular wave, and the level is 500mVpp (fOSC = 1.45MHz, typ.)
The higher local oscillation frequency (fOSC) to be, the lower buff output level to be owing to the load capacity.
So, in the case that it is connected to other circuits, take care of the input capacity of these circuits and stray
capacity of wire.
6. Tuning LED driver and stereo LED driver
The tuning LED driver and stereo LED driver don't have current limit resistance
shown in the right figure. So, it is necessary to add the current limit resistance:
R10, R11.
Set up the values of R10, R11 to keep the drive currents ID10, ID11 under 10mA.
7.FM detection circuit
For the FM detection circuit,detection coil is able to use instead of ceramic discriminator.
Recommended circuit and recommended coil are as follows.
In this case, please take care that Vin (lim.) falls a little.
Turns
Test
Frequency
Co
(pF)
Qo
1
2
3
1
346
Wire
(mm
φ)
REF
10.7MHz
100
12
0.12 UEW
SUMIDA ELECTRIC CO., LTD
2153
4095189 or equivalent
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