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SM9503A Arkusz danych(PDF) 7 Page - Nippon Precision Circuits Inc

Numer części SM9503A
Szczegółowy opis  Radio Controlled Clock Receiver IC
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Producent  NPC [Nippon Precision Circuits Inc]
Strona internetowa  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

SM9503A Arkusz danych(HTML) 7 Page - Nippon Precision Circuits Inc

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SM9503A
NIPPON PRECISION CIRCUITS INC.—7
FUNCTIONAL DESCRIPTION
AGC Amplifier and Gain Hold Function
The input voltage from the antenna is amplified by the AGC amplifier. The gain can be monitored by the volt-
age on pin CP, and can be changed by varying the CP voltage. An external capacitor Cp can be connected to CP
to stabilize the voltage, but the gain tracking time is dependent on the capacitance. When HLDN is open (or
HIGH), the gain automatically adjusts to follow the post-amplifier detector signal. When HLDN is LOW, the
immediately preceding gain is held for an interval determined by the Cp capacitance.
Crystal Filter Circuit
External crystals are used as filters. The center frequency and bandwidth of the filters is determined by the
crystal characteristics. If the center frequency is lower than the target frequency, it is necessary to add CL
capacitor for the adjustment frequency. If Q of the crystal filter is higher and the output delay is larger, it is nec-
essary to add RL to adjust it. Adding a compensation capacitor CC, it is possible to select built-in or external,
cancels the high-frequency components pass through the crystal parallel capacitance. Compensation capacitors
are built in, and wiring them inside makes possible to select versions of the required capacitances from 0.5pF
to 2.0pF.
µ
Detector Circuit
The amplified signal is full-wave rectified and passed through a lowpass filter detector. The detector output is
input to peak hold (pin CP) and bottom hold (pin CB) circuits to form the decoder reference potentials and
peak hold potential for AGC control.
The case of using the external compensation
capacitor
XO1
CL
XI
XO2
CC
AGC Amp
Post Amp
RL
CC
The case of using built-in compensation capacitor
XO1
CL
XI
XO2
AGC Amp
Post Amp
RL
CC
Amplifier
Rectifier
LPF
Peak/
Bottom
Hold
Peak hold
Bottom hold
VDD potential
VDD potential
VDD potential


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