![background image](http://html1.mh-extra.com/html/ramsey-electronics/sp1/sp1_manual_3604730020.webp)
SP-1
•
20
PIN
DESCRIPTION
1.
Filter output
2.
Filter input
3.
Chip disable (not used in SP1design).
4.
Vcc (DC supply voltage)
5.
Hybrid amplifier output #2
6.
Hybrid amplifier output #1
7.
Input to hybrid amplifier #1
8.
TX attenuator output
9.
TX attenuator input
10.
Microphone amplifier output
11.
Microphone amplifier input
12.
Mute input (mike amplifier muted by + DC at pin 12 )
13.
Volume control input
14.
Response time to switch between transmit and
receive established by R15 and C21.
15.
Supplies bias to volume control, filtered by C24.
16.
Time constant for TX BNM set by R11 and C16.
17.
Input to TX level detector on mike/speaker side.
18.
Output of TX level detector and input to TX BNM
19.
Output of RX level detector on mike/speaker side
20.
Input to RX level detector on mike/speaker side
21.
Input to RX attenuator and dial tone detector.
22.
Output of RX attenuator
23.
Input to transmit level detector on line side
24.
Output of transmit level detector on line side
25.
Output of RX level detector on line side,
also input to RX BNM
26.
Input to RX level detector on line side
27.
Time constant for RX BNM set by R16, C26.
28.
Ground for entire IC
Содержание SP1
Страница 6: ...SP 1 6 SP 1 PARTS LAYOUT DIAGRAM...
Страница 12: ...SP 1 12 SP1 SCHEMATIC DIAGRAM...
Страница 22: ...SP 1 22 PARTS LAYOUT DIAGRAM SP1 SPEAKERPHONE KIT...