T8531 Agere Systems, Inc., T8531 Datasheet - Page 24

• Manufacturer Part Number: T8531
• Description: T8502 and T8503 Dual PCM Codecs with Filters
• Manufacturer: Agere Systems, Inc.

Codec Chip Set
Electrical Characteristics
For all specifications: T
T
49.152 MHz.
dc Characteristics
Table 8. Digital Interface
Table 9. Analog Interface
24
Input Voltage
Output Voltage
Input Current
Output Current in High-impedance
Input Resistance
Input Resistance
Common-mode Reference Voltage VVRTX
CMT Input Sink Current
Input Voltage Swing
Load Resistance at VRP and VRN
Load Capacitance
Output Resistance
Output Offset Voltage Between
Output Offset Voltage Between
Output Voltage Swing (differential)
A
State
(dependent on the setting
of the termination impedance)
(differential)
VRP and VRN
VRP and VRN, Powerdown
= 25 C and V
Parameter
Parameter
DD
Pins Without a
= 5 V. Input signal frequency is 1020 Hz, unless otherwise noted. DSP clock frequency is
Pins with a
Pins with a
Pull-down
Pull-down
Pull-up or
Pull-up
A
= –40 C to +85 C, V
High
High
High
High
High
Symbol
Low
Low
Low
Low
Low
VOSPD
RVRTX
VRSW
IVRTX
—
RVTX
VVTX
VOS
RO
RL
CL
Symbol
V
DD
V
V
V
V
I
I
I
I
OHC
I
I
I
OZ
OH
IH
IH
IH
OL
IL
IL
IL
IH
IL
Digital pattern corresponding to idle
= 5 V
Digital input code corresponding to
RL = 100 k
0 dBm PCM code at 1.02 kHz
CL from VRP or VRN to V
Channel powered down
UPDO, SDX –40 C to 0 C
0.25 V < VTX < 4.75 V
2.3 V < VRTX < 2.5 V
2.3 V < VRTX < 2.5 V
UPDO, SDX 0 C to 85 C
5%, unless otherwise noted. Typical values are for
10 A max dc load
PCM code ( -law)
TTL-compatible inputs
TTL-compatible inputs
Test Conditions
Test Conditions
receive gain
GND < V
GND < V
GND < V
V
V
V
I
IH
IH
IH
differential maximum
I
L
I
L
L
= –320 A
< V
< V
< V
= –10 mA
—
—
—
= 10 mA
IN
IN
IN
IN
IN
IN
< V
< V
< V
< V
< V
< V
DD
DD
DD
IL
IL
IL
SSA
–120
Min
–10
–10
–30
–10
2.0
2.4
3.5
—
—
—
—
–100
2
5.28
Min
–20
4.0
10
2.2
—
—
—
—
Lucent Technologies Inc.
7
Typ
November 2000
—
—
—
—
—
—
—
—
—
—
—
—
—
Typ
2.4
—
—
—
—
—
—
—
2
0
0
Max
120
Max
0.7
0.4
400
100
100
10
–2
10
30
10
3.2
—
—
—
—
—
2.6
10
20
—
—
—
—
Vp-p
Vp-p
Unit
Unit
M
mV
mV
k
k
pF
V
V
V
V
V
V
A
A
A
A
A
A
A
A
A