EM91710A/B
TONE/PULES SWITCHABLE DIALER
TEST CIRCUIT
1
V+
A
Operation current
2
A
DP
DP
DT
V+
Standby current
V
KEY
BOARD
DD
MODE
V
V
DD
V
SS
HKS
HKS
SS
3
.
COUNTER
AND
AC METER
TONE
10K
Tone output voltage
V+
4
V+
SPECTRUM
ANALYZER
TONE
V
DD
Tone distortion
V
DD
KEYBOARD
ENTRY
10K
V
HKS
KEYBOARD
V
SS
ENTRY
HKS
V
SS
**
DIST.(dB)= 20log
√(V1)**2+(V2)**2+..+(Vn)**2
√(VL)**2+(VH)**2
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
A
V
+
5
Pulse output sink current(
V
+
open drain structure)
V
DD
Flash Key
HKS
Keypad input
A
V
VEXT
PO
VDD
ROW
HKS
VSS
MODE
R
*
C
*
V
SS
7
VDD
Column
A
HKS
VSS
V+
R*
C*
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.
9.30.1997
7
EMC [ ELAN MICROELECTRONICS CORP ]
