參數(shù)資料
型號(hào): MSM7540
廠商: OKI SEMICONDUCTOR CO., LTD.
元件分類(lèi): Codec
英文描述: Single Rail ADPCM CODEC
中文描述: 單軌差分PcM編解碼器
文件頁(yè)數(shù): 12/16頁(yè)
文件大?。?/td> 156K
代理商: MSM7540
12/16
MSM7540/7560
Semiconductor
FEDL7540-03
Digital Output
Delay Time
t
SDX
t
SDR
t
XD1
, t
RD1
t
XD2
, t
RD2
t
XD3
, t
RD3
50
50
50
50
50
200
200
200
200
200
ns
ns
ns
ns
ns
1 LSTTL + 100 pF,
Pull-up: 500
W
P
SRRT
P
SRRR
Noise Freq.
: 0 to 50 kHz
30
30
dB
dB
Power Supply Noise
Rejection Ratio
Noise Level
: 50 mV
PP
Parameter
Symbol
Level
(dBm0)
Min.
Typ.
Max.
Unit
(V
DD
=
4.5 V to 5.5 V, Ta = –25°C to +70°C)
Freq.
(Hz)
Others
Condition
N
IDLT
–69
(–72)
–72
(–75)
dBm0p
(dBmp)
N
IDLR
1020
A
VT
0.488
0.548
(*3)
0.548
(*3)
0.615
0
A
VR
0.488
0.615
Idle Channel Noise
AIN = SG
(*1)
(*2)
Vrms
Vrms
GSX2
Absolute Signal
Amplitude
VFRO
(*1)
AC Characteristics (Continued)
*1 Use the P-message weighted filter
*2 PCMRI input code
"11010101"(MSM7540)
"11111111"(MSM7560)
*3 0.548 Vrms = 0 dBm0= –3 dBm
Note:
All ADPCM coder and decoder characteristics comply with ITU-T Recommendation
G.721.
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