MSM7715 データシートの表示（PDF） - Oki Electric Industry
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MSM7715 Datasheet PDF : 21 Pages
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¡ Semiconductor
MSM7715
Note:
*1 0 dBm = 0.775 Vrms (For all AC characteristics)
*2 "Normal condition" means that a DTMF signal appears after more than 20 ms after
setting DTMF receive mode.
*3 "Just after mode change" means that there is an input signal when the mode is
changed from DTMF transmit mode to DTMF receive mode. If there is an input
signal when power is turned on, see "DTMF mode setting procedure after power on
or after releasing power down mode".
AC Characteristics (Modem)
Parameter
Symbol
Condition
(VDD = 2.5 V to 3.6 V, Ta = –40°C to +85°C)
Min. Typ. Max. Unit
Modem Transmit Level
Signal Level Relative Value
Modem Transmit
Carrier Frequency
Transmit Signal Output Deray
Time
VAOM
VDM
fOM
fOS
fAM
fAS
tADD
Measured at AOUT pin, R1 = R2
Mark signal/space signal
Mark, TD = "1"
Originate mode Space, TD = "0"
Answer mode
Mark, TD = "1"
Space, TD = "0"
TD Æ AOUT
–11
–1.5
976
1176
1646
1846
–9
0
980
1180
1650
1850
–7 dBm
1.5 dB
984
1184
Hz
1654
1854
— 3.5 — ms
Modem Receive Signal Level
Carrier Detection (CD)
Signal Level
CD Level Hysteresis
CD Delay Time
CD Hold Time
VAIM
VON
VOFF
VHYS
tCDD1
tCDD2
tCDH1
tCDH2
Measured at AIN. FSK modulation signal –48 *1 —
Answer mode : 1080 Hz OFFÆON — –44
Originate mode : 1750 Hz ONÆOFF –48 –46
VR2 open at AIN pin
—
2
OFF Æ –6 dBm
—
8
OFF Æ –40 dBm
5
14
–6 dBm Æ OFF
20 31
–40 dBm Æ OFF
— 23
–6
–42 dBm
—
— dB
—
22
ms
40
—
Demodulated Data Bias
Distortion
DBS 300 bps,1 : 1 pattern
— — ±10 %
NRTS Signal Versus
Modem Receive Signal
Allowable Level Ratio
VNR
VNRTS/V receive modem signal
NRTS : 2765 Hz ±30 Hz
— — –2 dB
Receive data output Delay
Time
tRDD
AIN Æ RD
—
5
— ms
*1 When the carrier detector does not detect (CD="1"), RD is fixed to "1".
AC Characteristics (Call progress tone detector)
Parameter
CPT Detect Level
CPT Non-Detect Level
CPT Detect Frequency
Symbol
VDETCP
VREJCP
fDETCP
400 Hz
400 Hz
See Fig. 3.
CPT Non-Detect Frequency fREJCP See Fig. 3.
CPT Detect Delay Time
CPT Detect Hold Time
tDELCP
tHOLCP
Condition
—
—
(VDD = 2.5 V to 3.6 V, Ta = –40°C to +85°C)
Min. Typ. Max. Unit
–40 — –6 dBm
— — –60 dBm
380 — 420 Hz
500 — —
Hz
— — 300
— 20 — ms
— 15 — ms
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