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參數(shù)資料
| 型號： | LC72713W |
| 廠商： | SANYO SEMICONDUCTOR CO LTD |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 10 X 10 MM, SQFP-64 |
| 文件頁數(shù)： | 11/22頁 |
| 文件大?。?/td> | 201K |
| 代理商： | LC72713W |
LC72131K, 72131KM
No.A0788-19/22
Dead Zone
The phase comparator compares fp to a reference frequency (fr) as shown in Figure 1. Although the
characteristics of this circuit (see Figure 2) are such that the output voltage is proportional to the phase difference
(line A), a region (the dead zone) in which it is not possible to compare small phase differences occurs in actual
ICs due to internal circuit delays and other factors (line B). A dead zone as small as possible is desirable for
products that must provide a high S/N ratio.
However, since a larger dead zone makes this circuit easier to use, a larger dead zone is appropriate for
popularlypriced products. This is because it is possible for RF signals to leak from the mixer to the VCO and
modulate the VCO in popularly-priced products in the presence of strong RF inputs. When the dead zone is
narrow, the circuit outputs correction pulses and this output can further modulate the VCO and generate beat
frequencies with the RF signal.
[2] Notes on the FMIN, AMIN, and IFIN Pins
Coupling capacitors must be placed as close as possible to their respective pin. A capacitance of about 100pF is
desirable. In particular, if a capacitance of 1000pF or over is used for the IF pin, the time to reach the bias level
will increase and incorrect counting may occur due to the relationship with the wait time.
[3] Notes on IF Counting
→SD must be used in conjunction with the IF counting time
When using IF counting, always implement IF counting by having the microprocessor determine the presence of
the IF-IC SD (station detect) signal and turn on the IF counter buffer only if the SD signal is present. Schemes in
which auto-searches are performed with only IF counting are not recommended, since they can cause false
detection where there is no signal due to overflow from the IF counter buffer.
[4] DO Pin Usage Techniques
In addition to data output mode times, the DO pin can also be used to check for IF counter count completion and
for unlock detection output. Also, an input pin state can be output unchanged through the DO pin and input to the
controller.
Pin States After the Power ON Reset [LC72131K]
Reference Divider
VCO
LPF
Programmable Divider
Phase
Detector
Figure 1
MIX
RF
Signal leak
fr
fp
Figure 2
φ(ns)
V
(A)
(B)
Dead Zone
Open
VSS
AOUT
AIN
PD
XOUT
VDD
LC72131K
FMIN
AMIN
IO2
IFIN
IO1
BO4
BO3
BO2
BO1
DO
CL
DI
XIN
CE
Input port
Open
Input port
NC
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