SA541 Sames, SA541 Datasheet - Page 6

• Manufacturer Part Number: SA541
• Description: PULSE/DTMF SWITCHABLE DIALLERS
• Manufacturer: Sames

and
6/16
SA541
Note 1: The MUTE output is provided to disable the microphone while maintaining the
Note 2: The MASK output may be used to disconnect the whole speech circuit in order
SA541
10
12
11
13
14
15
20
16
17
18
19
9
4
5
3
6
7
1
2
8
-
-
loop condition during DTMF transmission.
to mantain the break condition whilst on-hook, during a Timed Break Recall
(TBR) operation or LD dialling.
SA54L1
10
14
13
15
17
22
20
21
11
12
16
18
19
9
4
5
3
6
7
1
2
8
V
V
OSC OUT
OSC IN
MUTE
MASK
FILT IN
FILT OUT
MF OUT
IMP
SELECT
C1
C
C4
R3
R4
HSW
LOCK
N/C
Designation
C2
R1
R2
sames
DD
SS
Table 1: Pin Description
Active high output during keying, tone transmission and
Output to disable speech circuit during pulse dialling
Column output connections for 16 button single contact
No connection
Description
Positive Supply input
Negative Supply input
Connections for 560KHz ceramic resonator
MUTE key depression. (See Note 1)
Unity gain amplifier input and output for DTMF tone
filtering
DTMF output
'Loop disconnect' dialling output.
LD/DTMF selection, IDP and B:M ratio programming
keypad
Row input connections for 16 button single contact
keypad
Hookswitch input. A logic 1 (High) indicates an “off-
Lock Input must be tied to V
(except TBR, LNR and MUTE). Normal operation is
recall. (See Note 2)
hook” condition
enabled by connecting LOCK to V
SS
to disable all keypad keys
DD.