參數(shù)資料
型號: T8531
元件分類: Codec
英文描述: T8502 and T8503 Dual PCM Codecs with Filters
中文描述: T8502和T8503雙的PCM編解碼器與濾波器
文件頁數(shù): 24/48頁
文件大?。?/td> 999K
代理商: T8531
24
Lucent Technologies Inc.
Preliminary Data Sheet
November 2000
Codec Chip Set
T8531/T8532 Multichannel Programmable
Electrical Characteristics
For all specifications: T
A
= –40
°
C to +85
°
C, V
DD
= 5 V
±
5%, unless otherwise noted. Typical values are for
T
A
= 25
°
C and V
DD
= 5 V. Input signal frequency is 1020 Hz, unless otherwise noted. DSP clock frequency is
49.152 MHz.
dc Characteristics
Table 8. Digital Interface
Table 9. Analog Interface
Parameter
Symbol
V
IL
V
IH
V
OL
V
OH
V
OHC
I
IL
I
IH
Test Conditions
TTL-compatible inputs
TTL-compatible inputs
I
L
= 10 mA
I
L
= –10 mA
I
L
= –320
μ
A
GND < V
IN
< V
IL
V
IH
< V
IN
< V
DD
Min
2.0
2.4
3.5
–10
Typ
Max
0.7
0.4
10
Unit
V
V
V
V
V
μ
A
μ
A
Input Voltage
Low
High
Low
High
Output Voltage
Input Current
Pins Without a
Pull-up or
Pull-down
Pins with a
Pull-up
Low
High
Low
High
I
IL
I
IH
GND < V
IN
< V
IL
V
IH
< V
IN
< V
DD
GND < V
IN
< V
IL
V
IH
< V
IN
< V
DD
UPDO, SDX –40
°
C to 0
°
C
UPDO, SDX 0
°
C to 85
°
C
–120
–2
10
μ
A
μ
A
Pins with a
Pull-down
Low
High
I
IL
I
IH
–10
2
120
μ
A
μ
A
Output Current in High-impedance
State
I
OZ
–30
–10
30
10
μ
A
μ
A
Parameter
Symbol
RVTX
RVRTX
Test Conditions
0.25 V < VTX < 4.75 V
2.3 V < VRTX < 2.5 V
Min
10
7
Typ
Max
Unit
M
k
Input Resistance
Input Resistance
(dependent on the setting
of the termination impedance)
Common-mode Reference Voltage
CMT Input Sink Current
Input Voltage Swing
Load Resistance at VRP and VRN
(differential)
Load Capacitance
Output Resistance
VVRTX
IVRTX
VVTX
RL
2.2
4.0
2.4
2.6
400
3.2
V
μ
A
Vp-p
k
2.3 V < VRTX < 2.5 V
CL
RO
CL from VRP or VRN to V
SSA
Digital input code corresponding to
0 dBm PCM code at 1.02 kHz
Digital pattern corresponding to idle
PCM code (
μ
-law)
Channel powered down
10
μ
A max dc load
RL = 100 k
differential maximum
receive gain
2
100
10
pF
Output Offset Voltage Between
VRP and VRN
Output Offset Voltage Between
VRP and VRN, Powerdown
Output Voltage Swing (differential)
VOS
–100
0
100
mV
VOSPD
–20
0
20
mV
VRSW
5.28
Vp-p
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