Dtmf Characteristics - Hitachi H8/3637 Hardware Manual

14.2.5

DTMF Characteristics

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