參數(shù)資料
型號: T7570
廠商: Lineage Power
元件分類: Codec
英文描述: Programmable PCM Codec with Hybrid-Balance Filter(帶混合平衡濾波器的可編程PCM編解碼器)
中文描述: 可編程PCM編解碼器與混合平衡濾波器(帶混合平衡濾波器的可編程的PCM編解碼器)
文件頁數(shù): 15/28頁
文件大?。?/td> 489K
代理商: T7570
15
Lucent Technologies Inc.
Data Sheet
October 1996
T7570 Programmable PCM Codec
with Hybrid-Balance Filter
Transmission Characteristics
Table 13. Analog Interface
Table 14. Gain and Dynamic Range
Parameter
Symbol
R
VFXI
VOS
X
RL
VFRO
CL
VFRO
Test Conditions
Min
390
2.3
300
Typ Max
585
Unit
k
V
pF
Input Resistance
Input Offset Voltage at VF
X
I
Load Resistance
Load Capacitance
0.25 V < VF
X
I < 4.75 V
RL
VFRO
300
CL
VFRO
from VF
R
O to GND
Steady zero PCM code applied to D
R
0 or D
R
1
Alternating
±
zero PCM code applied to D
R
0
or D
R
1, maximum receive gain
Control register byte 2, bit 7 = 0
2.5
200
Output Resistance
Output Offset Voltage
at VF
R
O
Output Offset Voltage at
VF
R
O, Powerdown
Output Voltage Swing
RO
VFRO
VOS
R
2.3
1.6
3.0
2.5
V
VOS
RPD
2.3
2.5
V
V
SWR
RL = 300
, maximum receive gain
4.01
V
PP
Parameter
Symbol
G
AL
Test Conditions
Maximum 0 dBm0 levels:
VF
X
I (gain set to 11000011)
VF
R
O (gain set to 11000011)
Minimum 0 dBm0 levels:
VF
X
I (gain set to 00000001)
VF
R
O (gain set to 00000001)
Transmit gain programmed for
maximum 0 dBm0 test level,
measured deviation of digital
code from ideal 0 dBm0 PCM
code at D
X
0/1, T
A
= 25
°
C
Measured relative to G
XA
,
V
DD
= 5 V, minimum
gain < G
X
< maximum gain
Measured transmit gain over
the range from maximum to
minimum, calculated the devia-
tion from the programmed gain
relative to G
XA
(i.e., G
XAF
=
G
actual
– G
prog
– G
XA
),
T
A
= 25
°
C, V
DD
= 5 V
T
A
(
°
C)
Min
Typ
Max
Unit
Absolute Levels
0.811
0.987
Vrms
Vrms
87.0
106.0
0.15
mVrms
mVrms
dB
Transmit Gain
Absolute Accuracy
G
XA
–0.15
Transmit Gain Variation
with Temperature
G
XAT
–40 to 0 –0.15
0 to 85
0.15
0.1
dB
dB
–0.1
Transmit Gain Variation
with Programmed Gain
G
XAG
–0.1
0.1
dB
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