AN1500A South African Micro-Electronic Systems, AN1500A Datasheet - Page 25

• Manufacturer Part Number: AN1500A
• Description: Single Chip Telephone Demo Board
• Manufacturer: South African Micro-Electronic Systems

AN1500A
24 Part list
Designator
C1
C2
C3
C4
C5
C6
C7
C8
C9
C10
C11
C12
C13
C14
C15
C16
C17
CBF1
CBF2
D1
D2
D3
D4
D5
D6
D7-D9
D10
D11
EC1-EC6
IC1
IC2
J1
J2
J3
J4
J5, J6
LBF1
LBF2
LE1
LED1
LED2
Q1
Q1A,B
Q1C
Q2
Q3
Q4
Q5
R1
R2
R3
R4
25/27
Part Type
680n/250v
10n
1u
10u/35v
10u/30V
470u/16v
10n
10n
100u/25v
10n
100u/25v
10u
.../250V
12V
12V
24V
1N4148 (or LED)
10V
1N4148
1N4148
5v6
1n
SA252K
DF06
Line
Mode
LLC
(short circuited)
not fitted
not fitted
not fitted
BSS92
MPSA92
2SA1210
MPSA45
BC327
BC547B
BC557
5.1M
2K2
330k
220k
..../10V
sames
sames
sames
sames
Description
Ringer Capacitor
Anti aliasing filter, ring frequency detector
not fitted (hookswitch filter)
not fitted (sidetone network)
DC-AC separation, RX amplifier
DC-AC separation, RX amplifier
not fitted
Filter and buffer for ringer supply
Vdd supply capacitor
Oscillator fine tuning
TX response shaping, DC-AC separation
TX response shaping (low pass) (not fitted)
TX response shaping, DC-AC separation
Electret handset microphone supply filter
RX Response shaping (not fitted)
Analogue ground filter
DC-AC separation RX Output
Metering pulses blocking filter (not fitted)
Metering pulses blocking filter (not fitted)
Gate voltage protection for MOSFET transistor (not fitted)
Ringer voltage clamping, FCI input protection
not fitted
Ringer voltage limitation
Piezo ringer discharge (LED for ring indicator)
Surge protection
not fitted
Keyboard
Vdd limitation
EMC blocking capacitors (not fitted)
Single Chip Telephone
Rectifier bridge
Line connector pin selection
Dialling mode selector
Line Loss compensation selector
not fitted
Simulate on-resistance of keypad
Metering pulses blocking filter, must not be in saturation at Iline max
Metering pulses blocking filter
EMC filter (printed on PCB)
n/a
LED Tone Indicator (SA2532K)
Hook transistor for Mosfet option (not fitted)
Hook transistor for PNP Darlington option
Hook transistor for single PNP option (not fitted)
Driver transistor for Q1
Line current shunt transistor
Ringer driver transistor
Current limiter transistor (not fitted)
Leakage current limitation
Ringing impedance
FCI input protection and voltage divider
Voltage divider