Data Sheet
July 1998
T8502 and T8503 Dual PCM Codecs with Filters
Electrical Characteristics (continued)
dc Characteristics (continued)
Table 3. Power Dissipation
Power measurements are made at MCLK = 4.096 MHz with outputs unloaded and ASEL and GS[1:0] not
connected. Clock and frame sync levels are +5 V and 0 V.
Channels
Operational
Parameter
0
Standby Current
Symbol
IDDS
1
Partial Standby Current IDDP
2
Powerup Current
IDD1
Test Conditions
MCLK present;
FSX[1:0] = FSR[1:0] = 0 V
MCLK present;
FS pulses present for
one channel,
FSX = FSR = 0 V for other
channel
MCLK, FS pulses present
Min Typ Max Unit
—5
8 mA
— 10 16 mA
— 16 23 mA
Transmission Characteristics
Table 4. Analog Interface
Parameter
Symbol
Test Conditions
Input Resistance, VFXIN
RVFXI
0.25 V < VFXI < 4.75 V
Input Leakage Current, VFXIN
IBVFXI
0.25 V < VFXI < 4.75 V
dc Open-loop Voltage Gain, GSX
AVOL
—
Open-loop Unity Gain Bandwidth, GSX fO
—
Load Capacitance, GSX
CLX1
—
Load Resistance, GSX
RLX1
—
Input Voltage, VFXIN
VIX
Relative to ground
Load Resistance, VFRO
RLVFRO
—
Load Capacitance, VFRO
CLVFRO
—
Output Resistance, VFRO
ROVFRO
0 dBm0, 1020 Hz PCM code
applied to DR
Standby mode FSX = FSR = 0 V for
channel under test
Output Voltage, VFRO
VOR
Alternating ± zero µ-law PCM
code applied to DR
Output Voltage, VFRO, Standby
VORPD Standby mode FSX = FSR = 0 V for
channel under test, no load
Output Voltage Swing, VFRO
VSWR
RL = 2000 Ω
Min Typ Max
1.0 60 —
— 0.04 2.4
5000 — —
13 —
— — 50
10 — —
2.25 2.35 2.5
2000 — —
— — 100
— — 20
3000 — 10000
2.25 2.38 2.5
2.0 2.35 2.65
3.2 — —
Unit
MΩ
µA
—
MHz
pF
kΩ
V
Ω
pF
Ω
Ω
V
V
Vp-p
Lucent Technologies Inc.
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