309
14.2.5
DTMF Characteristics
Table 14.7 lists the DTMF generator characteristics.
Table 14.7
DTMF Characteristics
V
CC
= 2.7 V to 5.5 V, AV
CC
= 2.7 V to 5.5 V, V
SS
= AV
SS
= 0.0 V, T
a
= –20 to +75˚C, unless
otherwise specified
Item
Symbol
Applicable
Pins
Min
Typ
Max
Unit
Test Condition
Notes
Reference level
supply voltage
VT
ref
VT
ref
2.7
—
V
CC
+ 0.3 V
DTMF output
voltage (row)
V
OR
TONED
675
890
—
mVrms VT
ref
– GND = 2.7 V
R
L
= 100 k
Ω
Figure 14.8
1
DTMF output
voltage (column)
V
OC
TONED
700
935
—
mVrms VT
ref
– GND = 2.7 V
R
L
= 100 k
Ω
Figure 14.8
1
DTMF output
distortion
%DISDT TONED
—
3
7
%
VT
ref
– GND = 2.7 V
R
L
= 100 k
Ω
Figure 14.8
DTMF output
level
dB
CR
TONED
—
2.5
—
dB
VT
ref
– GND = 2.7 V
R
L
= 100 k
Ω
Figure 14.8
Notes: 1. V
OR
and V
OC
indicate the output voltage during single wave output.