Silan

Semiconductors

SC9102C/D

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 2.0

2001-11-02

9

TEST CIRCUIT

A

HKS

MODE

DP

DP

DT

keyboard

Operation

current

1

2

Standby

current

V+

Tone output voltage

3

Tone distortion

4

keyboard

HKS

TONE

V+

keyboard

counter

and

AC meter

10K

Ω

HKS

TONE

V+

Spectrum

analyzer

V

10K

Ω

A

HKS

V+

R*

Keypad input current (row group)

7

V+

C*

ROW

MODE

A

Pulse output sink current

(open drain structure)

5

6

Pulse output sink current

(inverter structure)

8

R*

V+

C*

COLUMN

MODE

A

PO

Flash

key

HKS

V+

V

VEXT

A

PO

V+

HKS

V

VEXT

A

keypad input current (column group)

Note: 1. Dist. (dB)=20log

{[V

1

2

3

n

]/[(V

L

H

]}

a. V1…Vn are extraneous frequencies (ie, inter modulation and harmonic), components in the 500Hz to 3400Hz band.

b. V

are the individual frequency components of DTMF signal.

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

2. Sink current Isink=I/(1-Duty Cycle), I is the net DC current measured from ampere meter.