Zakładka z wyszukiwarką danych komponentów |
|
LA1061M Arkusz danych(PDF) 4 Page - Sanyo Semicon Device |
|
LA1061M Arkusz danych(HTML) 4 Page - Sanyo Semicon Device |
4 / 8 page LA1061M No.3044-4/8 Functional Description General Operation The LA1061M has two inputs for weak and strong signal detection, and one for multi-path distortion detection. It has two outputs for Main and Sub-antenna selection, one of which is selected according to the state of the inputs. Both outputs can directly drive an antenna switching pin diode. Signal Strength Detection Each signal strength detection input has a built-in comparator. The weak signal comparator (pin 13) is driven by the S-meter DC voltage and has a threshold of approximately 2V. The antenna switching logic selects the Main antenna when the voltage on this pin is lower than the threshold, regardless of the state of the other inputs. The strong signal detector (pin 14) is driven by the F.E. AGC voltage and has a threshold of approximately 1V. The antenna switching logic selects the Sub-antenna if the voltage on this pin is lower than the threshold, the weak signal comparator is off, and the multi-path distortion detector is not already on. Pin Description Multi-path Distortion Detection The IF output signal is high-pass filtered and the resulting noise signal input through a coupling capacitor to pin 1, the LA1061M amplifies this signal and applies AGC to it. The AGC amplifier is designed to detect multi-path distortion without amplifying noise due to a weak IF signal. The number of noise pulses within the period set by the time constant on pin 4 is counted. If it exceeds a certain limit, and the strong signal detector is not already on, the antenna switching logic selects the Main antenna. Switching Frequency Detection The LA1061M counts the number of antenna changes within the time interval set by the time constant on pin 12. The internal D/A converter outputs a current on pin 11, which is converted to a voltage by the resistor connected to this pin. If this voltage exceeds a certain value, that is, the switching frequency is too high, the Main antenna is selected for the period set by the time constant on pin 10. The Main antenna is selected for this time regardless of the state of the other inputs. Pin No. Function External circuits Notes 1 Noise input Isolate noise components present in the IF output signal with a high-pass filter, and input via a decoupling capacitor. The input impedance of the LA 1061M varies with input level. The minimum value is 10k Ω. Continued on next page. Unit (resistance : Ω, capacitance : F) |
Podobny numer części - LA1061M |
|
Podobny opis - LA1061M |
|
|
Link URL |
Polityka prywatności |
ALLDATASHEET.PL |
Czy Alldatasheet okazała się pomocna? [ DONATE ] |
O Alldatasheet | Reklama | Kontakt | Polityka prywatności | Linki | Lista producentów All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |