MT8888C Zarlink Semiconductor, MT8888C Datasheet - Page 6

• Manufacturer Part Number: MT8888C
• Description: Integrated DTMF Transceiver with Intel Micro Interface
• Manufacturer: Zarlink Semiconductor

receiver will tolerate signal interruptions (drop out) too short to be considered a valid pause. This facility, together
with the capability of selecting the steering time constants externally, allows the designer to tailor performance to
meet a wide variety of system requirements.
5.0
The simple steering circuit shown in Figure 5 is adequate for most applications. Component values are chosen
according to the following inequalities (see Figure 7):
Guard Time Adjustment
V
DD
MT8888C
St/GT
V
ESt
t
Figure 5 - Basic Steering Circuit
t
DD
REC
REC
t
t
ID
DO
≥ t
Zarlink Semiconductor Inc.
≥ t
≤ t
≤ t
DAmax
DPmax
DAmin
DPmin
MT8888C
t
t
GTA
GTP
R1
+t
+t
+t
+t
= (R1C1) In (V
= (R1C1) In [V
GTAmax
6
GTAmin
GTPmin
GTPmax
Vc
C1
- t
- t
- t
- t
DPmin
DPmax
DAmax
DD
DD
DAmin
/ V
/ (V
TSt
DD
)
-V
TSt
)]
Data Sheet