參數(shù)資料
型號(hào)： LM4550VHX/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 X 1.40 MM, LQFP-48
文件頁(yè)數(shù)： 6/30頁(yè)
文件大?。?/td> 611K
代理商： LM4550VHX/NOPB
Pin Descriptions (Continued)
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 (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, 42
43, 44
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.
Typical Performance Characteristics
ADC Noise Floor
DAC Noise Floor
10097215
10097216
LM4550
www.national.com
14
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