CPC5710N

6

www.clare.com

R02

With the application circuit in Figure 6., the series

capacitors serve to reduce the magnitude of the

high-amplitude, low-frequency ringing signals, while

making the ringing detection threshold of the

CPC5710N variable with the frequency of the ringing

signal. With the circuit as given, CMPOUT will change

states with a 15Hz ringing signal at approximately

change states with a ringing signal amplitude of

In applications where CPC5710N will be used only as

a ringing level detector, or if significant attenuation of

the amplified signal can be tolerated, the frequency

variability of the ringing detection threshold can be

reduced by increasing the value of the resistors and

capacitors in series with the input.

Clare Application Note AN-117 Customize Caller ID Gain

and Ringing Detect Voltage Threshold is a spreadsheet for

trying different component values in this circuit for

LITELINK snoop circuit applications.

2.4 Power Quality

CPC5710N works best with a clean power supply. To

clean up power supply noise, Clare, Inc., recommends

Figure 4., if needed.

Figure 4. Optional Power Supply pi Network

Note: For lower-frequency noise, use a 220

µH

inductor in series with R100.

3.3 or 5 V

R100

10

To V

Pin 1

DD

A

A

C101

10

FB100

600

200 mA

Ω

C100

1