HM91710A 데이터 시트보기 (PDF) - ELAN Microelectronics
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HM91710A Datasheet PDF : 19 Pages
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TEST CIRCUIT
1
V+
Operation current
2
A
V
DP
KEY
BOARD
DD
MODE
DP
DT
HKS
V
SS
HM91710A/B
TONE/PULES SWITCHABLE DIALER
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
**
Ã(V1)**2+(V2)**2+..+(Vn)**2
DIST.(dB)= 20log
Ã(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.
1.7.2002 7
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