參數(shù)資料
型號(hào): T7503
元件分類: Codec
英文描述: T7503 Dual PCM Codec with Filters
中文描述: T7503雙PCM編解碼器與濾波器
文件頁數(shù): 6/16頁
文件大小: 417K
代理商: T7503
6
Lucent Technologies Inc.
Data Sheet
February 1998
T7503 Dual PCM Codec with Filters
Transmission Characteristics
(continued)
ac Transmission Characteristics
Unless otherwise noted, the analog input is a 0 dBm0, 1020 Hz sine wave; the input amplifier is set for unity gain.
The digital input is a PCM bit stream equivalent to that obtained by passing a 0 dBm0, 1020 Hz sine wave through
an ideal encoder. The output level is sin(x)/x-corrected.
Table 5. Absolute Gain
Table 6. Gain Tracking
Table 7. Distortion
Parameter
Symbol
EmW
Test Conditions
Signal input of 0.775 Vrms
μ
-law
Min
–0.25
Typ
Max
0.25
Unit
dBm0
Encoder Milliwatt
Response (transmit gain
tolerance)
Decoder Milliwatt
Response (receive gain
tolerance)
DmW
Measured single-ended relative to
0.775 Vrms
μ
-law,
PCM input of 0 dBm0 1020 Hz
RL = 10 k
–0.25
0.25
dBm0
Parameter
Symbol
GT
X
Test Conditions
+3 dBm0 to –37 dBm0
–37 dBm0 to –50 dBm0
+3 dBm0 to –37 dBm0
–37 dBm0 to –50 dBm0
Min
–0.25
–0.50
–0.25
–0.50
Typ
Max
0.25
0.50
0.25
0.50
Unit
dB
dB
dB
dB
Transmit Gain Tracking Error
Sinusoidal Input
Receive Gain Tracking Error
Sinusoidal Input
GT
R
Parameter
Symbol
SD
X
Test Conditions
Min
36
30
25
36
30
25
Typ
Max
–38
Unit
dB
dB
dB
dB
dB
dB
dBm0
Transmit Signal to Distortion
μ
-law +3 dBm0
VF
X
I
–30 dBm0
μ
-law –30 dBm0
VF
X
I
–40 dBm0
μ
-law –40 dBm0
VFxI
–45 dBm0
μ
-law +3 dBm0
VF
R
O
–30 dBm0
μ
-law –30 dBm0
VF
R
O
–40 dBm0
μ
-law –40 dBm0
VF
R
O
–45 dBm0
200 Hz—3400 Hz, 0 dBm0 input,
output any other single
frequency
3400 Hz
200 Hz—3400 Hz, 0 dBm0 input,
output any other single
frequency
3400 Hz
Transmit or receive, two frequencies
in the range (300 Hz—3400 Hz)
at –6 dBm0
Receive Signal to Distortion
SD
R
Single Frequency Distortion,
Transmit
SFD
X
Single Frequency Distortion,
Receive
SFD
R
–40
dBm0
Intermodulation Distortion
IMD
–42
dBm0
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