MC145540 Datasheet, PDF (55/116 Pages) Motorola, Inc – ADPCM Codec

6
APPLICATION CIRCUITS
+3V
1 kΩ
68 µF
1 kΩ
1.0 µF
1 kΩ
MIC
1 kΩ
1.0 µF
RINGER
150 Ω
20 kΩ
+3 V
RECEIVER
150 Ω
20 kΩ
TG
TI -
TI +
20 kΩ
VAG
0.1 µF
RO
AXO -
AXO +
0.1 µF
0.1 µF
3 kΩ
VDSP
VEXT
PI
PO -
PO +
PDI/RESET
SCP EN
1•
28 ^VDD
2
27 ^FSR
3
26 ^BCLKR
4
25 DR
5
24 ^C1+
0.1 µF
6
23 ^C1-
7
22 ^VSS
8
21 SPC
9
20 ^DT
10
19 ^BCLKT
11
18 ^FST
12
17 ^{SCP RX}
13
16 ^{SCP TX}
14
15 ^{SCP CLK}
MC145540
1.0 µF
ADPCM IN
20.736 MHz
ADPCM OUT
2.048 MHz
8 kHz
TO MICROCONTROLLER
SERIAL PERIPHERAL
INTERFACE PORT AND
RESET CIRCUIT
Figure 6-1. MC145540 Handset Application
MOTOROLA
MC145540
6-1