參數(shù)資料
型號(hào)： LM4549AVH/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 消費(fèi)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(yè)數(shù)： 5/28頁(yè)
文件大?。?/td> 543K
代理商： LM4549AVH/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 LM4549A
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 address 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 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.
EAPD
47
O
External Amplifier Power Down control signal
This output is set by the EAPD bit (bit D15) in the Powerdown Control/ Status register, 26h.
As with the other logic outputs, the output voltage is set by DV
DD. This pin is intended to be
connected to the shutdown pin on an external power amplifier. For normal operation the
default value of EAPD=0 will enable the external amplifier allowing an input on PC_BEEP to
be heard during Cold Reset.
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 (3.3F, 0.1F) 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).
LM4549A
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM4549AVHX 制造商:Rochester Electronics LLC 功能描述:AC97 REV2.1 CODEC - Bulk
LM4549B 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:AC ’97 Rev 2.1 Multi-Channel Audio Codec with Sample Rate Conversion and National 3D Sound
LM4549BVH 功能描述:接口—CODEC RoHS:否 制造商:Texas Instruments 類(lèi)型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
LM4549BVH/NOPB 功能描述:接口—CODEC RoHS:否 制造商:Texas Instruments 類(lèi)型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
LM4549BVHX 功能描述:接口—CODEC RoHS:否 制造商:Texas Instruments 類(lèi)型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類(lèi)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(fēng)格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
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