75t204 ETC-unknow, 75t204 Datasheet - Page 6

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75t204

Manufacturer Part Number
75t204
Description
Low-power Subscriber Dtmf Receiver
Manufacturer
ETC-unknow
Datasheet

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75T204
5V Low-Power Subscriber
DTMF Receiver
APPLICATION INFORMATION
The 75T204 will tolerate total input RMS noise up to
12dB below the lowest amplitude tone.
telephone applications, the combination of the high
frequency attenuation of the telephone line and
internal band-limiting make special circuitry at the
input to the 75T204 unnecessary. However, noise
near the 56kHz internal sampling frequency will be
aliased (folded back) into the audio spectrum, so if
SIGNAL
NOISY
0.01 mF = 20%
For most
2.4 k = 5%
FIGURE 5: RC Filter
6
excessive noise is present above 28kHz, the simple
RC filter shown in Figure 5 may be employed to
band limit the incoming signal.
Noise will also be reduced by placing a grounded
trace around the XIN and XOUT pins on the circuit
board layout when using a crystal. It is important to
note that XOUT is not intended to drive an additional
device. XIN may be driven externally; in this case
leave XOUT floating.
ANALOG IN
75T204

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