AK2358F Datasheet, PDF (24/26 Pages) Asahi Kasei Microsystems – Base-band LSI for Europian Cordless Telephones(CTI, CTI+)

ASAHI KASEI
[AK2358FI
OCrystal oscillator
- Crystal resonator , resistor and capacitors should be connected as shown Fig.3 for
on-chip oscillator operation.
- For external clock operation, if the high(H) level of the input clock signal
amplitude equals to or is greater than 1.5V, and the low(L) level equals to or is
smaller than 0.5V, then connection should be made as shown in Fig.4.
If the input clock signal amplitude (peak-to-peak) equals to or is smaller than
lV, and equals to or is greater than 200mV, then AC coupling should be as
illustrated in Fig.5.
1=^XIN
22pF
XOUT
3.58MHz
lM i
22pF
*
-
F- XIN
External clock signal
Fig.3
Fig.4
IrTXIN O.Ol#F
~External clock signal
lM Cl
XOUT
fig.5
OLimit level adjusting resistor
The limiting level can be controled externally by applying DC voltage to LIMIV pin.
Applied DC voltage should be larger than TAGND, then the limiting level is shown as
TAGND*Va(V), while Va is the voltage between LIMIV and TAGND. Keeping LIMIV pin open
provides default limit level. See following example-
VDD
LIMLV
R
.+:
Vss
LSI
R=50k .$2
0152-E-00
-23-
1996/]2