msm7540 Oki Semiconductor, msm7540 Datasheet - Page 12

• Manufacturer Part Number: msm7540
• Description: Single Rail Adpcm Codec
• Manufacturer: Oki Semiconductor

¡ Semiconductor
AC Characteristics (Continued)
*1 Use the P-message weighted filter
*2 PCMRI input code
*3 0.548 Vrms = 0 dBm0= –3 dBm
Note: All ADPCM coder and decoder characteristics comply with ITU-T Recommendation
Idle Channel Noise
Absolute Signal
Amplitude
Power Supply Noise
Rejection Ratio
Digital Output
Delay Time
Parameter
G.721.
Symbol
t
t
t
XD1
XD2
XD3
P
P
N
N
"11010101"(MSM7540)
"11111111"(MSM7560)
t
t
A
A
SRRR
SRRT
SDX
SDR
IDLT
IDLR
, t
, t
, t
VR
VT
RD1
RD2
RD3
: 0 to 50 kHz
Noise Freq.
Freq.
1020
(Hz)
—
—
—
Condition
1 LSTTL + 100 pF,
Pull-up: 500 W
Noise Level
: 50 mV
AIN = SG
(dBm0)
Level
—
0
PP
Others
GSX2
VFRO
(*1)
(*1)
(*2)
—
—
(V
DD
= 4.5 V to 5.5 V, Ta = –25°C to +70°C)
0.488
0.488
Min.
—
—
30
30
50
50
50
50
50
0.548
0.548
Typ.
(*3)
(*3)
—
—
—
—
—
—
—
—
—
MSM7540/7560
FEDL7540-03
Max.
(–72)
(–75)
0.615
0.615
–69
–72
200
200
200
200
200
—
—
12/16
(dBmp)
dBm0p
Vrms
Vrms
Unit
dB
dB
ns
ns
ns
ns
ns