LM4549 National Semiconductor, LM4549 Datasheet - Page 4

• Manufacturer Part Number: LM4549
• Description: AC 97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound
• Manufacturer: National Semiconductor

www.national.com
Digital Timing Specifications (Note 2)
T
T
T
T
The following specifications apply for AV
Limits apply for T
SH
SYNC2CLK
SU2RST
RST2HZ
Electrical Characteristics
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 func-
tional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guar-
antee 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
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 k
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
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
A
= 25˚C. The reference for 0dB is 1Vrms unless otherwise specified.
DMAX
Parameter
= (T
JMAX
–T
A
)/
DD
JA
(Notes 1, 3) (Continued)
= 5V, DV
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4549, T
DD
resistor.
For warm reset
For warm reset
For ATE Test Mode
For ATE Test Mode
= 5V, Fs = 48kHz, single codec configuration, unless otherwise noted.
4
Conditions
JMAX
,
JA
, and the ambient temperature T
(Note 7)
Typical
1.3
LM4549
(Note 8)
162.8
Limit
15
25
JMAX
A
. The maximum
= 150˚C. The
nS (max)
nS (min)
nS (min)
(Limits)
Units
µS