lm4550 National Semiconductor Corporation, lm4550 Datasheet - Page 5

• Manufacturer Part Number: lm4550
• Description: Ac ?97 Rev 2.1 Multi-channel Audio Codec With Stereo Headphone Amplifier, Sample Rate Conversion And National 3d Sound
• Manufacturer: National Semiconductor Corporation

T
T
T
T
T
T
T
FALL
RST_LOW
RST2CLK
SH
SYNC2CLK
SU2RST
RST2HZ
Electrical Characteristics
48kHz, single codec configuration, unless otherwise noted. Limits apply for T
otherwise specified. (Continued)
Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2: These specifications are guaranteed by design and characterization; they are not production tested.
Note 3: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 4: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation is P
The typical junction-to-ambient thermal resistance is 74˚C/W for package number VBH48A.
Note 5: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 6: Machine Model, 220 pF–240 pF discharged through all pins.
Note 7: Typicals are measured at 25˚C and represent the parametric norm.
Note 8: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Symbol
Fall Time
RESET# active low pulse width
RESET# inactive to BIT_CLK start up For cold reset
SYNC active high pulse width
SYNC inactive to BIT_CLK start up
Setup to trailing edge of RESET#
Rising edge of RESET# to Hi-Z
DMAX
Parameter
= (T
JMAX
–T
A
)/θ
(Notes 1, 3) The following specifications apply for AV
JA
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4550, T
BIT_CLK, SYNC, SDATA_IN or
SDATA_OUT
For cold reset
For warm reset
For warm reset
For ATE Test Mode
For ATE Test Mode
5
Conditions
A
= 25˚C. The reference for 0dB is 1Vrms unless
JMAX
, θ
JA
, and the ambient temperature T
DD
(Note 7)
Typical
1.3
= 5V, DV
LM4550
(Note 8)
DD
Limit
162.8
162.8
1.0
15
25
6
= 5V, Fs =
A
. The maximum
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JMAX
nS (max)
nS (max)
µS (min)
nS (min)
nS (min)
nS (min)
(Limits)
= 150˚C.
Units
µS