FEDL7020-02
1
Semiconductor
ML7020
AC Characteristics (DTMF Section)
(VDD = 4.5 to 5.5 V, Ta = –40 to +85°C)
Parameter
Symbol
VDTTL
Condition
Min.
Typ. Max. Unit
Lower group
tone
–7.0
–4.5
–2.5
2
–3.0 dBm
–1.0 dBm
Transmit level
LO–, LO+_Differential *1
Higher group
tone
VDTTH
VDTDF
fDDT
–5.5
1
Transmit signal level
relative value
(Higher group tone) – (lower group tone)
Relative to the nominal frequency
3
dB
%
Transmit signal frequency
deviation
–1.5
—
—
+1.5
Transmit signal distortion
rate
THDDT
VDETDT
(Harmonic waves) – (fundamental wave)
—
–23
–6
dB
DTMF detection level
For one frequency
For one frequency
–42
—
—
—
—
dBm
DTMF non-detection level VREJDT
–60 dBm
Detection frequency band
Non-detection frequency
band
fDETDT
Relative to the nominal frequency
—
±1.5
%
fREJDT
Relative to the nominal frequency
(Higher group tone) – (lower group tone)
(Noise level) – (tone level) 0.3 to 3.4 kHz
380 to 420 Hz
±3.8
–6
—-
—
—
%
Level difference between
two received frequencies
Permissible received
noise level
VTWIST
LOSSR6
VREJCP
+6
—
—
dB
dB
dB
—
–12
53
Received dial tone
elimination ratio
37
Signal repetition period
Input signal persistence
duration
tc
ts
120
49
—
—
—
—
—
—
—
41
28
0.6
—
—
—
—
—
—
26
20
0.6
–6
—
—
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
dB
Detection
tl
Non-detection
24
—
During the tone 1, tone 2,
and loop back modes.
See Figure 3 and Table 3
for details.
Signal quiet duration
Instantaneous break
protection period
tp
30
—
tba
tbb
tg
SP = 0
SP = 1
0.4
10
49
35
1.0
—
—
Detection delay time
Detection hold time
SP delay time
24
24
0.2
60
35
—
td
tsp
tc
Signal repetition period
Input signal persistence
duration
During the tone 3 mode.
See Figure 3 and Table 3
for details.
ts
Detection
—
tl
Non-detection
10
—
Signal quiet duration
Instantaneous break
protection period
tp
21
—
tba
tbb
tg
SP = 0
SP = 1
0.4
3.0
37
27
1.0
–4.5
—
Detection delay time
Detection hold time
SP delay time
12
15
0.2
–7.5
td
tsp
VATT
ATT attenuation
Relative to the ATT = “0” reference
Note: 0 dBm = 0.775 Vrms
*1: The value will be 6 dB smaller for pin LO+ or pin LO– alone.
9/19
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