- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄378018 > MSM7715 (OKI SEMICONDUCTOR CO., LTD.) Multi-Function Telecommunication LSI PDF資料下載
參數(shù)資料
| 型號： | MSM7715 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Multi-Function Telecommunication LSI |
| 中文描述： | 多功能通信大規(guī)模集成電路 |
| 文件頁數(shù)： | 19/21頁 |
| 文件大?。?/td> | 150K |
| 代理商： | MSM7715 |
Semiconductor
MSM7715
19/21
Analog Interface
600
W
: 600
W
r
4
r
3
+
–
R7
R6
R14
+
–
+
–
R9
R8
+
–
AMP1
R13
AMP2
–
+
R10
600
W
AOUT
AIN
4 dB
V
T
V
R
Line
SGO
C7
R11
R12
SG
C9
C8
R15
≥
60 k
W
R15
Figure 12 Analog Interface Circuit Example
When R1 = R2 in the modem mode, the AOUT output level is at its maximum value of about –9
dBm. When R1 = R3 in DTMF mode, the AOUT output level is at its maximum value of –11 dBm
(sum of the low group and high group). To increase the transmit output level in the line to a high
level, use an external amplifier (AMP1).
The receive signal levels can be adjusted by the values of R13 and R14.
Clock noise of about –70 dBm will be generated from AOUT as out-of-band noise. (Clock noise
has a frequency of 27.965 kHz and its odd harmonics.) The clock noise level is nearly always
constant even if the output level of AOUT is lowered by varying the values of resistors R1 to R3
that are connected to GAT1, GAT2, DTO, and MOD. Therefore, to suppress this noise output to
the line, build a LPF at the AMP1. Note, however, that setting the cutoff frequency of the LPF
too low affects the output signal level.
Note that too large a time constant determined by the values of C9 and R15 allows the longer time
required for reaching a stable DC level, which may result in the violation of specification for the
DTMF signal receive output delay time.
Example: R15=100 k
W
, C9=0.022
m
F.
Larger circuit-return levels of the transmit signal to the AIN pin can cause receive data errors.
If the line impedance is equal to the R10 impedance, R8=R9 can not induce the circuit-return
levels of the transmit signal to the AIN pin.
The peripheral circuits should be designed so that the circuit-return level, including variations
of the line impedance, of the transmit signal to the AIN pin is –9 dBm or less.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MSM7728 | Single Rail Linear CODEC |
| MSM7731-01 | Multifunction PCM CODEC (Voice Signal Processor) |
| MSM7731-02 | Dual Echo Canceler & Noise Canceler with Dual Codec for Hands-Free |
| MSM80C154S | CMOS 8-bit Microcontroller |
| MSM83C154S | Electrical, Duct/Raceway (Trunking); |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MSM7715GS-2K | 制造商:ROHM Semiconductor 功能描述: |
| MSM7716 | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Single Rail Linear CODEC |
| MSM7716GSK | 制造商:ROHM Semiconductor 功能描述: |
| MSM7716GS-K | 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Single Rail Linear CODEC |
| MSM7716GS-KR1 | 制造商:ROHM Semiconductor 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。