mc145443dw Freescale Semiconductor, Inc, mc145443dw Datasheet - Page 7

• Manufacturer Part Number: mc145443dw
• Description: Single-chip 300-baud Modem
• Manufacturer: Freescale Semiconductor, Inc

MOTOROLA
RxA2
RxA1
RxA2
RxA1
RxA2
RxA1
RxA2
RxA1
TxD
TxD
TxD
TxD
15
11
16
15
16
15
16
11
11
15
11
16
(c) Originate/Channel 1 Mode and Analog Loopback State (MODE = High, LB = Low)
(d) Answer/Channel 2 Mode and Analog Loopback State (MODE = Low, LB = Low)
–
+
–
+
–
+
–
+
(a) Originate/Channel 1 Mode (MODE = High, LB = Low)
MODULATOR
AAF
MODULATOR
AAF
(b) Answer/Channel 2 Mode (MODE = Low, LB = Low)
S/H
S/H
MODULATOR
AAF
MODULATOR
AAF
Figure 4. Basic Operating Modes
S/H
S/H
HIGH–BAND
LOW–BAND
HIGH–BAND
LOW–BAND
BPF
BPF
BPF
BPF
HIGH–BAND
LOW–BAND
HIGH–BAND
LOW–BAND
BPF
BPF
BPF
BPF
SMOOTHING
SMOOTHING
FILTER
FILTER
AMP
AMP
AC
AC
SMOOTHING
SMOOTHING
FILTER
FILTER
AMP
AMP
AC
AC
CARRIER
DETECT
CARRIER
DEMOD
DETECT
DEMOD
–
+
–
+
MC145442 MC145443
CARRIER
DETECT
CARRIER
DEMOD
DETECT
DEMOD
–
+
–
+
17
18
17
18
3
5
1
3
5
1
CD
RxD
DSI
TxA
Exl
CD
RxD
DSI
TxA
Exl
17
17
3
5
1
18
3
5
1
18
CD
RxD
DSI
TxA
Exl
CD
RxD
DSI
TxA
Exl
7