參數(shù)資料
型號(hào)： TB1254N
元件分類(lèi)： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PDIP56
封裝： 0.600 INCH, PLASTIC, SDIP-56
文件頁(yè)數(shù)： 27/58頁(yè)
文件大?。?/td> 526K
代理商： TB1254N
Ver3.7
00/01/28 33
Note
Items/Symbols
Bus conditions
Measurement methods
P11
Capture range of the
PLL
/ fpH(p)
/ fpL(p)
Hold range of the PLL
/ fhH(p)
/ fhL(p)
RF AGC : except
0
PIF Freq. :
38.9MHz
VCO Adj. Req. :
0/1
Others : Preset
(1)Input a signal that 38.9[MHz], 90[dB
V] at pin 6.
(2)Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO Adj.
Req.” to “0”.
(3)Sweep down the input signal frequency to 34.9[MHz], and
sweep up to 43.9[MHz]. Sweep down the input signal frequency
to 38.9[MHz].
(4)Measure the voltage at pin 55 and measure the frequency of the
input signal shown as below.
Frequency of
the input signal
Vo
lt
a
g
e
of
p
i
n
5
38.9[MHz]
f h(p)L
f p(p)L
f h(p)H
f p(p)H
P12
Control steepness of
the VCO
/
PIF Freq. :
38.9MHz
VCO Adj. Req. :
0/1
Others : Preset
(1) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO
Adj. Req.” to “0”.
(2) Set the FET probe which connected to the spectrum analyzer
near by pin 50 or pin 51 (Don’t touch the probe directly to pin 50
or to pin 51).
(3) Apply 2.3[V] to pin 47, and measure frequency of the VCO
oscillation by the spectrum analyzer (fLVCO[MHz]).
(4) Apply 2.7[V] to pin 47, and measure frequency of the VCO
oscillation by the spectrum analyzer (fHVCO[MHz]).
(5)
[MHz/V] = (fHVCO-fLVCO)/0.4
P13
Steepness of the AFT
detection
/ S AFT
AFT Voltage
/ VAFTmax
/ VAFTmin
PIF Freq. :
38.9MHz
VCO Adj. Req.:
0/1
Others : Preset
(1) Input a 38.9[MHz], 90[dB
V] signal at pin 6.
(2) Set the bit of “VCO Adj. Req.” to “1”, and set the bit of “VCO
Adj. Req.” to “0”.
(3) Input a 38.9[MHz]-20[kHz], 90[dB
V], non-modulation signal at
pin 6.
(4) Measure the voltage at pin 55 (VH#55[V]).
(5) Input a 38.9[MHz]+20[kHz], 90[dB
V], non-modulation signal
at pin 6.
(6) Measure the voltage at pin 55 (VL#55[V]).
(7) S AFT[kHz/V] = 40/(VH#55-VL#55)
(8) Input a 38.9[MHz]-500[kHz], 90[dB
V], non-modulation signal
at pin 6.
(9) Measure the voltage at pin 55 (VAFTmax[V]).
(10) Input a 38.9[MHz]+500[kHz], 90[dB
V], non-modulation signal
at pin 6.
(11) Measure the voltage at pin 55 (VAFTmin[V]).
P14
AFT output voltage on
defeating
Preset
(1)Measure the voltage at pin 55 (VAFT Def[V]).
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