CSP1027 Datasheet, PDF (47/64 Pages) Agere Systems – CSP1027 Voice Band Codec for Cellular Handset and Modem Applications

Data Sheet
December 1999
CSP1027 Voice Band Codec for
Cellular Handset and Modem Applications
8 Device Characteristics
8.1 Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are abso-
lute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess
of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended
periods can adversely affect device reliability.
External leads can be bonded and soldered safely at temperatures of up to 300 °C.
Voltage Range on any Pin with Respect to Ground................................................................. –0.5 V to +6 V
Power Dissipation ................................................................................................................................. 0.3 W
Ambient Temperature Range...............................................................................................–40 °C to +85 °C
Storage Temperature Range ....................................................................................................... –65 °C to +150 °C
8.2 Handling Precautions
All MOS devices must be handled with certain precautions to avoid damage due to the accumulation of static
charge. Although input protection circuitry has been incorporated into the devices to minimize the effect of this
static buildup, proper precautions should be taken to avoid exposure to electrostatic discharge during handling and
mounting. Lucent Technologies employs a human-body model for ESD-susceptibility testing. Since the failure volt-
age of electronic devices is dependent on the current, voltage, and, hence, the resistance and capacitance, it is
important that standard values be employed to establish a reference by which to compare test data. Values of
100 pF and 1500 Ω are the most common and are the values used in the Lucent human-body model test circuit.
The breakdown voltage for the CSP1027 is greater than 1000 V.
8.3 Recommended Operating Conditions
Table 11. Recommended Operating Conditions
Parameter
Analog Supply Voltage
Digital Supply Voltage
Ambient Temperature
Symbol
Min
VDDA
4.5
VDD
2.7
TA
–40
Max
5.5
5.5
85
Unit
V
V
°C
8.3.1 Package Thermal Considerations
The recommended operating temperature specified above is based on the maximum power, package type, and
maximum junction temperature. The following equation describes the relationship between these parameters. Cer-
tain applications' maximum power may be less than the worst-case value and can use this relationship to determine
the maximum ambient temperature allowed.
TA = TJ – P x ΘJA
Maximum Junction Temperature (TJ) in 44-Pin QFP ...........................................................................125 °C
44-pin QFP Maximum Thermal Resistance in Still-Air-Ambient (ΘJA).............................................. 39 °C/W
Maximum Junction Temperature (TJ) in 48-Pin TQFP.........................................................................125 °C
48-pin TQFP Maximum Thermal Resistance in Still-Air-Ambient (ΘJA) ........................................... 90 °C/W
Lucent Technologies Inc.
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