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參數資料
| 型號： | T4227-DBQ |
| 廠商： | TEMIC SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, UUC12 |
| 封裝： | DIE-12 |
| 文件頁數： | 7/13頁 |
| 文件大?。?/td> | 105K |
| 代理商： | T4227-DBQ |
T4227
Preliminary Information
Rev. A2, 24-Jul-00
3 (13)
IN1, IN2
A ferrite antenna is connected between IN1 and IN2. For
high sensitivity, the Q factor of the antenna circuit should
be as high as possible. Please note that a high Q factor
requires temperature compensation of the resonant
frequency in most cases. We recommend a Q factor
between 40 and 150. Depending on the application. An
optimal signal-to-noise ratio will be achieved by a reso-
nant resistance of 50 k
W to 200 kW.
from
AGC
IN1
GND
200k
VCC
200k
PAD 6
(Pin 7)
PAD5
(Pin 6)
RF–Amp
IN2
PAD 4
(Pin 5)
PAD 2
Figure 4.
RFO
In order to achieve a high selectivity, a crystal is con-
nected between the Pins RFO and RFI. It is used with the
serial resonant frequency according to the time-code
transmitter (e.g., 60 kHz WWVB, 77.5 kHz DCF or
40 kHz Japan) and acts as a serial resonator. The given
parallel capacitor of the filter crystal (about 0.8 pF) is in-
ternally compensated so that the bandwidth of the filter
is about 10 Hz. The impedance of RFI is high. Parasitic
loads have to be avoided.
Figure 5.
RFI
Figure 6.
DEM
Demodulator output. To ensure the function, a external
capacitor has to be connected at this output.
Figure 7.
HLD
AGC hold mode: HLD high (VHDL = VCC) sets normal
function, SL low (VHDL = 0) holds for a short time the
AGC voltage. This can be used to prevent the AGC from
peak voltages, created by e.g. a stepper motor.
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