ML7436N LSI Hardware Design Manual
FEXL7436NDG-01
7
1.
Bypass capacitors
Notes the following when placing bypass capacitors.
⚫
The VDD and GND traces should be wider than other signal line traces to reduce the resister element.
⚫
Bypass capacitor should be placed as close to an LSI pin as possible. The recommended distance between
ML7436N pin and the capacitor is less than 2mm. The smaller capacitor should be closer to an LSI pin than other
capacitors.
⚫
The RF_VBG (#28) pin is a reference voltage output pin of band-gap reference circuit. Placing a 0.1μF multilayer
ceramic capacitor to the RF_VBG (#28) pin to reduce the noise from the band-gap reference circuit.
2.
Crystal Oscillator circuit
Figure 2.1
shows a configuration example of the crystal oscillator circuit. Capacitors should be connected to RF_XIN
(#1), RF_XOUT (#48), CXIN(#19) and CXOUT(#18) pins to stabilize crystal oscillator circuit. To determine the
component values, the oscillator circuit evaluation on your designing board is required, since the stray capacitor of the
board will be influenced. Amplitude level, oscillation margin, frequency deviation and oscillator circuit start-up time
should be considered and evaluated.
Figure 2.1
Crystal Oscillator circuit configurations
Cp1
Cp2
X’tal_1
Rs1
Cp3
Cp4
X’tal_2
Rs2
CXIN(#
19)
CXOUT(
#18)
RF_XOU
T(#4
8)
RF_XIN
(#1)
