HT9033 datasheet(3/9 Pages) HOLTEK

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A.C. Characteristics

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

Low Tone Frequency

¾¾

2130

High Tone Frequency

¾¾

2750

Frequency Deviation Acceptance

Range within which,

tones are accepted

¾¾

±0.7

Frequency Deviation Reject

Range outside of which,

tones are rejected

±2.5

¾¾

Acceptable Signal Level per Tone

No speech

-33

dBm

Reject Signal Level per Tone

No speech

¾-36

dBm

Twist Accept Limit

¾¾

±7

Signal to Noise Ratio

¾¾

-19

tDET

Present Detect Time

¾¾

Clock (System Frequency)

Ta=25

°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

VDD

Conditions

Clock Input Frequency

3.5759 3.5795 3.5831

MHz

tLHCL

Clock Input Rising Time

¾¾

110

tHLCL

Clock Input Falling Time

¾¾

110

DCCL

Clock Input Duty Cycle

HT9033

Rev. 1.00

May 22, 2006

Functional Description

Power Down Mode

If PDWN pin= 1, the HT9033 is in reset status and the

CAS detector is at power down mode, all function is dis-

able. The oscillator circuit will be stop.

If PDWN pin= 0, CAS detector is activated.

CAS Detector Output Signal

The output pin DO is CMOS structure. At the normal sta-

tus (CAS tone is not presence), the DO pin output low.

When the CAS tone is detected, the DO pin will output

high level.

CAS Detector Timing

C A S T o n e

D O

C o n d i t i o n 1 ( S t a n d a r d C A S T o n e ) :

C o n d i t i o n 2 ( C o n t i n u o u s C A S T o n e ) :

C A S T o n e

D O

t D E T

t o f f

8 0 m s

t D o f f

t D u r a t i o n

t D o f f

Parameter

Note

Min.

Typ.

Max.

Unit

tDET

CAS Detecting Time

toff

DO Off Time

tDuration

DO Duration Time

145

tDoff

DO Duration Off Time

If the CAS tone is presence more than tDET time, the CAS tone will be detected, then the DO will output high.

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