lm4549a National Semiconductor Corporation, lm4549a Datasheet - Page 5

• Manufacturer Part Number: lm4549a
• Description: Ac ?97 Rev 2.1 Multi-channel Audio Codec With Sample Rate Conversion And National 3d Sound
• Manufacturer: National Semiconductor Corporation

T
T
T
T
T
T
T
T
T
T
T
CO
RISE
FALL
RST_LOW
RST2CLK
SH
SYNC2CLK
S2_PDOWN
SUPPLY2RST
SU2RST
RST2HZ
Electrical Characteristics
kHz, single codec configuration, unless otherwise noted. Limits apply for T
otherwise specified. (Continued)
Note 1: 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 2: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 3: Machine Model, 220 pF – 240 pF discharged through all pins.
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: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Loopthrough mode describes a path from an analog input through the analog mixer to an analog output
Note 9: These specifications are guaranteed by design and characterization; they are not production tested.
Note 10: Out of band energy is measured from 28.8 kHz to 100 kHz relative to a 1 Vrms DAC output.
Symbol
Output Valid Delay
Rise Time
Fall Time
RESET# active low pulse width
RESET# inactive to BIT_CLK start
up
SYNC active high pulse width
SYNC inactive to BIT_CLK start up
AC Link Power Down Delay
Power On Reset
Setup to trailing edge of RESET#
Rising edge of RESET# to Hi-Z
DMAX
Parameter
= (T
JMAX
– T
A
)/θ
JA
(Notes 1, 5) The following specifications apply for AV
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4549A, T
Output Delay of SDATA_IN from rising
edge of BIT_CLK
BIT_CLK, SYNC, SDATA_IN or
SDATA_OUT
BIT_CLK, SYNC, SDATA_IN or
SDATA_OUT
For Cold Reset
For Cold Reset
For Warm Reset
For Warm Reset
Delay from end of Slot 2 to BIT_CLK,
SDATA_IN low
Time from minimum valid supply levels
to end of Reset
For ATE Test Mode
For ATE Test Mode
5
Conditions
A
= 25˚C. The reference for 0 dB is 1 Vrms unless
JMAX
, θ
JA
, and the ambient temperature T
DD
(Note 6)
Typical
TBD
TBD
TBD
1.3
= 5V, DV
LM4549A
(Note 7)
DD
Limit
162.8
162.8
TBD
1.0
15
15
25
6
6
1
1
= 5V, Fs = 48
A
. The maximum
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JMAX
ns (max)
ns (max)
ns (max)
µs (max)
ns (max)
(Limits)
µs (min)
ns (min)
µs (min)
ns (min)
µs (min)
ns (min)
= 150˚C.
Units