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參數(shù)資料
| 型號： | MSM7708-02 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 元件分類： | Codec |
| 英文描述： | Serial Register Interface ADPCM CODEC for Telephone Recording(用于電話記錄的串行寄存器接口ADPCM編碼譯碼器) |
| 中文描述： | 串行接口差分PcM注冊解碼器的電話錄音（用于電話記錄的串行寄存器接口差分PcM編碼譯碼器） |
| 文件頁數(shù)： | 19/38頁 |
| 文件大?。?/td> | 232K |
| 代理商： | MSM7708-02 |
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Semiconductor
MSM7708-02
19/38
AC Characteristics (Continued)
*1 P-message filter used
*2 PCMRI input: "11010101" (A-law), "11111111" (
m
-law)
*3 0.320 Vrms = 0 dBm0 = –7.7 dBm (600
W
)
ADPCM unit characteristics are fully compliant with ITU-T Recommendation G.721.
AC Characteristics (DTMF and Other Tones)
*1. Not including programmable gain set values
AC Characteristics (Gain Settings)
D
G
For all gain set values
–1
0
+1
dB
Transmit/Receive Gain
Setting Accuracy
Parameter
Symbol
Min.
Typ.
Max.
Unit
(V
DD
= 2.7 V to 3.6 V, Ta = –25°C to +70°C)
Condition
–2.5
dB
T
VXON
Silence
voice
—
5
—
ms
Transmit Voice/Silence
Detection Time
T
VXOF
Parameter
Symbol
Min.
Typ.
Max.
Unit
(V
DD
= 2.7 V to 3.6 V, Ta = –25°C to +70°C)
Condition
140/300
160/320
180/340
ms
Voice
silence
D
VX
For detection level set values by
CRM6 - B6, B5
VOXO pin: See Fig. 2
0
2.5
Transmit Voice
Detection Level Accuracy
Voice/silence
differential: 10 dB
AC Characteristics (Voice/Silence Detect Function)
P
SRRT
Noise frequency:
0 to 50 kHz
P
SRRR
30
30
—
—
—
—
dB
dB
Power Supply Noise
Rejection Ratio
Noise level:
50 mVpp
—
Parameter
Symbol
Level dBm0
Min.
Typ.
Max.
Unit
(V
DD
= 2.7 V to 3.6 V, Ta = –25°C to +70°C)
Frequency (Hz)
Other
Condition
N
IDLT
—
—
—
–68
(–75.7)
–72
(–79.7)
dBmOp
(dBmp)
N
IDLR
—
—
1020
A
VT
A
VR
0.285
0.285
0.320
0.320
0.359
0.359
0
—
Idle Channel Noise
(*1)
AIN = SG
Vrms
Vrms
GSX2
VFRO
Absolute Level (*3)
(*2)
—
—
–18
–16
–10
–8
1
dBm0
dBm0
dBm0
dBm0
dB
D
FT1
D
FT2
V
TL
V
TH
V
RL
V
RH
R
DTMF
DTMF tones, Other various tones
Tone scale
Transmit side tone
(Gain setting 0 dB)
–1.5
–1.0
—
—
–16
–14
–8
–6
2
+1.5
+1.0
–14
–12
–6
–4
3
%
%
Frequency Deviation
Parameter
Symbol
Min.
Typ.
Max.
Unit
(V
DD
= 2.7 V to 3.6 V, Ta = –25°C to +70°C)
Condition
Receive side tone
(Gain setting –6 dB)
V
TH
/V
TL
, V
RH
/V
RL
Tone Reference
Output Level
(*1)
DTMF Tone Level Relative Value
DTMF (low group)
DTMF (high group), other
DTMF (low group)
DTMF (high group), other
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