Block Diagram

Supply current operation 2-1

Minimum input signal level

Maximum input signal level

Must detect frequency range

Input Impedance

Call progress tone response time

Call pogress tone de-response time

Detect duty ratio

VRECL

VRECH

VREJ

fV350

fV440

Zin

mA

dBm

dBm

dBm

Hz

Hz

k

Ω

ms

ms

%

5.0

-

2

-

355

445

-

56

56

65

3.7

-

-

-

350

440

100

-

-

50

-

-38

-

-50

345

435

-

28

28

35

Input frequency:

Must detect frequency range

VRECL, VRECH are proportional

to VDD.

Input signal level: 0dBm

Input frequency: 100Hz~2000Hz

Conditions

Symbol

Unit

Min.

Typ.

Max.

(Unless otherwise noted, Ta=25˚C, V

Electrical characteristics

Parameter

Must not detect signal level

*Detect Duty Ratio which input signal (350Hz+440Hz) burst at 5Hz (Duty Ratio=50%)

350Hz

440Hz

*

VDD

VSS

ENABLE

VDD

VSS

ENABLE

INPUT

XIN

XOUT

DETECT

VREF

Timer

VREF

OSC

AGC

AAF

BPF

(350Hz)

Comparator

CLOCK

CLOCK

GENERATOR

BU8877/F

Comparator

BPF

(440Hz)