AN1500A South African Micro-Electronic Systems, AN1500A Datasheet - Page 26

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

AN1500A
Designator
R5
R6
R7
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
R19
R20
R21, R23
R22
R24
R25
R26
S1-S17
SW1
VR1
X1
Z1
Z2
Z3
25 Applications
Applications based on the SA2531/2 are continuously updated. Ask your local distributor or SAMES sales office for
available papers.
26/27
Part Type
not fitted
not fitted
220k
150k
1M
10k
30
300
2k7
3k3
330k
not fitted
100k
510R
not fitted
2K2
1K1
not fitted
short circuited
short circuited
1K
SPST
SW-HOOK
150V
3.58MHz
LINE
Handset
Ringer
sames
sames
sames
sames
Piezo ringer connector
Description
Line Current sensing resistor for Q5
Pull-up resistor, HS input current limitation
Base resistor for Q2
Base shunt resistor for Q2
Base/gate series resistor for Q1
Sensing resistor for DC-mask and Line current
Side tone balance bridge resistor
Side tine network
Side tone network
Leakage current supply during On-Hook
Ringing impedance
Pull-up resistor for Q4
Low pass filter for ringer capacitance
Series resistor for LED1
Filter for electret hanset microphone supply
Supply for electret microphone
TX Frequency response shaping
RX Frequency response shaping
RX Frequency response shaping
Series resistor for LED2
Keypad Switches
Telephone Hook switch
Varistor, surge protection
Ceramic resonator
AMP modular connector
AMP modular connector