EM91810A Просмотр технического описания (PDF) - ELAN Microelectronics

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EM91810A

TONE/PULES SWITCHABLE DIALER WITH LCD INTERFACE TONE/PULSE SWITCHABLE DIALER WITH LCD INTERFACE

ELAN Microelectronics 

EM91810A/B

TONE/PULES SWITCHABLE DIALER WITH LCD INTERFACE

TEST CIRCUIT

1

V+

Operation current

2

A

KEY

BOARD

VDD

MODE

DP

DP

DT

HKS VSS

V+ Standby current

A

VDD

HKS

VSS

3

COUNTER

AND

AC METER

TONE

10K

Tone output voltage

.

V+

VDD

HKS

VSS

KEYBOARD

ENTRY

4

SPECTRUM

ANALYZER

10K

V

Tone distortion

V+

TONE VDD

HKS

VSS

KEYBOARD

ENTRY

**

√(V1)**2+(V2)**2+..+(Vn)**2

DIST.(dB)= 20log

√(VL)**2+(VH)**2

5

Pulse output sink current(

V+ open drain structure)

A

V

VEXT

PO

VDD

HKS

VSS

Flash Key

a. V1....Vn are extraneous frequencies (ie, inter modulation and

harmonic)

components in the 500Hz to 3400Hz band.

b. VL,VH are the individual frequency components of the

DTMF signal

c. Whether keyboard is pushed refer to the TONE mode time

diagram

6

V+ Keypad input

A

VDD

ROW

R*

HKS VSS MODE C *

7

Column

A

HKS

V+

VDD

R*

C*

VSS MODE

Isink=I/(1-Duty Cycle) I is the net DC current measured from

ampere meter.

R* , C* mean others column and row.

* This specification are subject to be changed without notice.

10.1.1997 7

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