![](http://datasheet.mmic.net.cn/390000/TB1261F_datasheet_16836569/TB1261F_38.png)
TB1261F/TB1262F
2002-6-30 38 / 66
Note
S7
Items/Symbols
AF output signal
amplitude
/ vDet(s)6.5M
AF output S/N
/ S/N(s)6.5M
Total harmonics
distortion
/ THD6.5M
AF output signal
amplitude
/ vDet(s)4.5ML
AF output S/N
/ S/N(s)4.5ML
Total harmonics
distortion
/ THD4.5ML
AF output signal
amplitude
/ vDet(s)4.5MH
AF output S/N
/ S/N(s)4.5MH
Total harmonics
distortion
/ THD4.5MH
Limiting sensitivity
/ vin lim(s)4.5MH
/ vin lim(s)4.5ML
/ vin lim(s)5.5M
/ vin lim(s)6.0M
/ vin lim(s)6.5M
Bus conditions
SIF-Freq. : 6.5M
AUDIO ATT :
127
Others : Preset
Measurement methods
(1) Input a signal that 6.5[MHz], 100[dB( V)], 50[kHz] deviated
by 400[Hz] sine wave at pin 73.
(2) Do same measuring as vDet(s)5.5M et al. (vDet(s)6.5M,
S/N(s)6.5M, THD6.5M).
S8
SIF-Freq. : 4.5M
Au Gain : 1
AUDIO ATT :
127
Others : Preset
(1) Input a signal that 4.5[MHz], 100[dB( V)], 25[kHz] deviated
by 400[kHz] sine wave at pin 73.
(2) Do same measuring as vDet(s)5.5MH et al. (vDet(s)4.5ML,
S/N(s)4.5ML, THD4.5ML).
S9
SIF-Freq. : 4.5M
Au Gain : 0
AUDIO ATT :
127
Others : Preset
(1) Input a signal that 4.5[MHz], 100[dB( V)], 25[kHz] deviated
by 400[Hz] sine wave at pin 73.
(2) Do same measuring as vDet(s)5.5M et al. (vDet(s)4.5MGH,
S/N(s)4.5ML, THD4.5MH).
S10
SIF-Freq. :
4.5M/5.5M/6.0M/
6.5M
AUDIO ATT :
127
Au Gain : 0/1
Others : Preset
(1) Set the bits of “SIF-Freq.” to “11”, “Au Gain” to “0”.
(2) Input a signal that 4.5[MHz], 100[dB( V)], 25[kHz] deviated
by 400[Hz] sine wave at pin 73.
(3) Measure the amplitude at pin 65 (vo#65[mVrms]).
(4) Decreasing the 4.5[MHz] signal level, measure the 4.5[MHz]
signal level at which the amplitude at pin 65 turns to be
–3[dB] against “vo#4” (vin lim(s)4.5MH[dB( V)]).
(5) Input a signal that 4.5[MHz], 100[dB( V)], 25[kHz] deviated
by 400[Hz] sine wave at pin 73.
(6) Set the bits of “Au Gain” to “1”.
(7) Do same measuring as above (3)~(4) (vin lim(s)4.5ML).
(8) Set the bits of “SIF-Freq.” to “00”.
(9) Change the frequency of the input signal to 5.5MHz, and
change the deviation of the input signal to 50[kHz].
(10) Do same measuring as above (3)~(4) (vin lim(s)5.5M).
(11) Set the bits of “SIF-Freq.” to “01”.
(12) Change the frequency of the input signal to 6.0MHz, and do
same measuring as above (3)~(4) (vin lim(s)6.0M).
(13) Set the bits of “SIF-Freq.” to “10”.
(14) Change the frequency of the input signal to 6.5MHz, and do
same measuring as above (3)~(4) (vin lim(s)6.5M).