mt8885an1 Zarlink Semiconductor, mt8885an1 Datasheet - Page 7

• Manufacturer Part Number: mt8885an1
• Description: Integrated Dtmf Transceiver With Power-down And Adaptive Micro Interface
• Manufacturer: Zarlink Semiconductor

V
St/GT
ESt
V
St/GT
ESt
DD
DD
Figure 6 - Guard Time Adjustment
R1
R1
Zarlink Semiconductor Inc.
MT8885
t
t
GTP
GTP
R2
a) decreasing tGTP; (tGTP < tGTA)
b) decreasing tGTA; (tGTP > tGTA)
C1
R2
C1
= (R1C1) In [V
= (R
7
t
t
GTA
GTA
P
C1) In [V
R
R
= (R1C1) In (V
P
P
= (R
= (R1R2) / (R1 + R2)
= (R1R2) / (R1 + R2)
p
C1) In (V
DD
DD
/ (V
/ (V
DD
DD
DD
DD
-V
-V
/V
/V
TSt
TSt
TSt
TSt
)]
)]
)
)
Data Sheet