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TB1254N Datasheet(PDF) 33 Page - Toshiba Semiconductor |
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TB1254N Datasheet(HTML) 33 Page - Toshiba Semiconductor |
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33 / 58 page  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 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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Similar Description - TB1254N |
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