參數(shù)資料
型號： LM4548AVH/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP48
封裝： 7 X 7 MM, 1.40 MM HEIGHT, LQFP-48
文件頁數(shù)： 5/28頁
文件大?。?/td> 538K
代理商： LM4548AVH/NOPB
Pin Descriptions (Continued)
DIGITAL I/O AND CLOCKING (Continued)
Name
Pin
I / O
Functional Description
RESET#
11
I
Cold Reset
This active low signal causes a hardware reset which returns the control registers and all
internal circuits to their default conditions. RESET# must be used to initialize the LM4548A
after Power On when the supplies have stabilized. Cold Reset also clears the codec from
both ATE and Vendor test modes. In addition, while active, it switches the PC_BEEP mono
input directly to both channels of the LINE_OUT stereo output.
ID0#
45
I
Codec Identity
ID1# and ID0# determine the Codec Identity for multiple codec use. The Codec Identity
configures the codec in either Primary or one of three Secondary Codec modes. These
Identity pins are of inverted polarity relative to the Codec Identity bits ID1, ID0 (bits D15, D14)
in the read-only Extended Audio ID register, 28h. If the ID0# pin (pin 45) is connected to
ground then the ID0 bit (D14, reg 28h) will be set to “1”. Similarly, connection to DV
DD will set
the ID0 bit to “0”. If left open (NC), ID0# is pulled High by an internal pull-up resistor.
ID1#
46
I
Codec Identity
ID1# and ID0# determine the Codec Identity for multiple codec use. The Codec Identity
configures the codec in either Primary or one of three Secondary Codec modes. These
Identity pins are of inverted polarity relative to the Codec Identity bits ID1, ID0 (bits D15, D14)
in the read-only Extended Audio ID register, 28h. If the ID01# pin (pin 46) is connected to
ground then the ID1 bit (D15, reg 28h) will be set to “1”. Similarly, connection to DV
DD will set
the ID1 bit to “0”. If left open (NC), ID1 is pulled high by an internal pull-up resistor.
POWER SUPPLIES AND REFERENCES
Name
Pin
I / O
Functional Description
AV
DD
25
I
Analog supply
AV
SS
26
I
Analog ground
DV
DD1
1
I
Digital supply
DV
DD2
9
I
Digital supply
DV
SS1
4
I
Digital ground
DV
SS2
7
I
Digital ground
V
REF
27
O
Nominal 2.2 V internal reference
Not intended to sink or source current. Use short traces to bypass (3.3 F, 0.1 F) this pin to
maximize codec performance. This pin must be tied to AV
DD witha10k
pull-up resistor.
V
REF_OUT
28
O
Nominal 2.2 V reference output
Can source up to 5 mA of current and can be used to bias a microphone.
3D SOUND AND NO-CONNECTS (NC)
Name
Pin
I / O
Functional Description
3DP, 3DN
33,34
O
These pins are used to complete the National 3D Sound stereo enhancement circuit. Connect
a 0.022 F capacitor between pins 3DP and 3DN. National 3D Sound can be turned on and
off via the 3D bit (D13) in the General Purpose register, 20h. National 3D Sound uses a
fixed-depth type stereo enhancement circuit hence the 3D Control register, 22h is read-only
and is not programmable. If National 3D Sound is not needed, these pins should be left open
(NC).
NC
29, 30
31, 32
38, 40
42, 43
44, 47,
48
NC
These pins are not used and should be left open (NC).
For second source applications these pins may be connected to a noise-free supply or
ground (e.g. AV
DD or AVSS), either directly or through a capacitor.
LM4548A
www.national.com
13
相關(guān)PDF資料
PDF描述
LM4548VHX SPECIALTY CONSUMER CIRCUIT, PQFP48
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4548AVHX 制造商:Rochester Electronics LLC 功能描述:- Bulk
LM4548VH 制造商:Texas Instruments 功能描述:
LM4549 制造商:NSC 制造商全稱:National Semiconductor 功能描述:AC ’97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound
LM4549A 制造商:NSC 制造商全稱:National Semiconductor 功能描述:AC ’97 Rev 2.1 Codec with Sample Rate Conversion and National 3D Sound
LM4549AVH 制造商:Rochester Electronics LLC 功能描述:AC97 REV2.1 CODEC - Bulk 制造商:OC White Company 功能描述:Audio Codec 2ADC / 2DAC 18-Bit 48-Pin LQFP Tray
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