參數(shù)資料
型號： LM4546AVH/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)： 4/27頁
文件大?。?/td> 897K
代理商： LM4546AVH/NOPB
Pin Descriptions (Continued)
DIGITAL I/O AND CLOCKING (Continued)
Name
Pin
I / O
Functional Description
SYNC
10
I
AC Link frame marker and Warm Reset
This input defines the boundaries of AC Link frames. Each frame lasts 256 periods of
BIT_CLK. In normal operation SYNC is a 48 kHz positive pulse with a duty cycle of 6.25%
(16/256). SYNC is sampled on the rising edge of BIT_CLK and the codec takes the first
positive sample of SYNC as defining the start of a new AC Link frame. If a subsequent SYNC
pulse occurs within 255 BIT_CLK periods of the frame start it will be ignored.
SYNC is also used as an active high input to perform an (asynchronous) Warm Reset. Warm
Reset is used to clear a power down state on the codec AC Link interface.
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 LM4546A
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 have the same polarity as 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 address for multiple codec use. The Codec Identity
configures the codec in either Primary or one of three Secondary Codec modes. These
Identity pins have the same polarity as the Codec Identity bits ID1, ID0 (bits D15, D14) in the
read-only Extended Audio ID register, 28h. If the ID1# 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).
LM4546A
www.national.com
12
相關PDF資料
PDF描述
LM4546VHX SPECIALTY CONSUMER CIRCUIT, PQFP48
LM4546MDC SPECIALTY CONSUMER CIRCUIT, UUC
LM4546MWC SPECIALTY CONSUMER CIRCUIT, UUC
LM4546AVHX/NOPB SPECIALTY CONSUMER CIRCUIT, PQFP48
LM4546VH/NOPB SPECIALTY CONSUMER CIRCUIT, PQFP48
相關代理商/技術參數(shù)
參數(shù)描述
LM4546AVHX 制造商:Rochester Electronics LLC 功能描述:AC97 REV2 CODEC 3D STEREO - Bulk
LM4546B 制造商:NSC 制造商全稱:National Semiconductor 功能描述:AC ’97 Rev 2 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound
LM4546BVH 功能描述:接口—CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
LM4546BVH /NOPB 制造商:Texas Instruments 功能描述:Audio Codec 2ADC / 2DAC 18-Bit 48-Pin LQFP Tray
LM4546BVH/NOPB 功能描述:接口—CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
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