U4285BM Datasheet, PDF (8/10 Pages) TEMIC Semiconductors – AM / FM - PLL

U4285BM
Recommendations for Applications
D C₃ = 100 nF should be very close to Pin 1 (V_DD) and
Pin 20 (GND 1)
D GND 2 (Pin 10 – analogue ground) and GND 1
(Pin 20 – digital ground) must be connected according
to figure 8
D 4 MHz crystal must be very close to Pin 18 and Pin 19
D Components of the charge pump (C₁/R₁ for AM and
C₂/R₂ for FM) should be very close to Pin 14 with
respect to Pin 13.
PCB-Layout
GND
C₁
C₂
20
19
18 17
16
15
14
13 12 11
C₄
C₃
VDD
1
2
3
4
5
6
7
8
9 10
Figure 8.
95 10124
8 (10)
TELEFUNKEN Semiconductors
Rev. A3, 14-May-97