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參數(shù)資料
| 型號： | LM4548VHX/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, TQFP-48 |
| 文件頁數(shù)： | 17/17頁 |
| 文件大小： | 328K |
| 代理商： | LM4548VHX/NOPB |
Pin Description (Continued)
Digital I/O and Clocking
Name
Pin
I / O
Functional Description
XTL_IN
2
I
24.576 MHz crystal input. Use a fundamental-mode type crystal. When operating from a
crystal, a 1M
resistor must be connected across pins 2 and 3.
XTL_OUT
3
O
24.576 MHz crystal output. When operating from a crystal, a 1M
resistor must be
connected across pins 2 and 3.
SDATA_OUT
5
I
This data stream contains both control data and DAC audio data. This input is sampled by
the LM4548 on the falling edge of BIT_CLK.
BIT_CLK
6
I/O
OUTPUT when in Primary Codec Mode: This pin outputs a 12.288 MHz clock which is
derived (internally divided by two) from the 24.576MHz crystal input (XTL_IN).
INPUT when in Secondary Codec Mode (Multiple Codec configurations only): 12.288MHz
clock is to be supplied from an external source, such as from the BIT_CLK of a Primary
Codec.
SDATA_IN
8
O
This data stream contains both control data and ADC audio data. This output is clocked out
by the LM4548 on the rising edge of BIT_CLK.
SYNC
10
I
48kHz sync pulse which signifies the beginning of both the SDATA_IN and SDATA_OUT
serial streams. SYNC must be synchronous to BIT_CLK.
RESET#
11
I
This active low signal causes a hardware reset which returns the control registers to their
default conditions.
ID0
45
I
ID0 and ID1 set the codec address for multiple codec use where ID0 is the LSB. Connect
these pins to DVdd or GND as required. If these pins are not connected (NC), they default
to Master Codec setting (same as connecting both pins to GND). These pins are of the
same polarity as their internal ID0, ID1 registers. If pin 45 is connected to GND, then ID0 will
be set to
″0″ internally. Connection to DVdd corresponds to a ″1″ internally.
ID1
46
I
ID0 and ID1 set the codec address for multiple codec use where ID1 is the MSB. Connect
these pins to DVdd or GND as required. If these pins are not connected (NC), they default
to Master Codec setting (same as connecting both pins to GND). These pins are of the
same polarity as their internal ID0, ID1 registers. If pin46 is connected to GND, then ID1 will
be set to
″0″ internally. Connection to DVdd corresponds to a ″1″ internally.
Power Supplies and References
Name
Pin
I / O
Functional Description
AVDD
25
I
Analog supply.
AVSS
26
I
Analog ground.
DVDD
1,9
I
Digital supply.
DVSS
4,7
I
Digital ground.
VREF
27
O
Nominal 2.2V reference output. Not intended to sink or source current. Bypassing of this pin
should be done with short traces to maximize performance.
VREFOUT
28
O
Nominal 2.2V reference output. Can source up to 5mA of current and can be used to bias a
microphone.
AFILT1
29
O
This pin is not used and should be left open (NC). However, a capacitor to ground on this
pin is permitted - it will not affect performance.
AFILT2
30
O
This pin is not used and should be left open (NC). However, a capacitor to ground on this
pin is permitted - it will not affect performance.
3DP, 3DN
33,34
O
These pins are used to complete the National 3D Sound circuit. Connect a 0.022F
capacitor between pins 3DP and 3DN. The National 3D Sound can be turned on and off via
bit D13 in control register 20h. This is a fixed-depth type stereo enhance circuit, thus writing
to register 22h has no effect. If National 3D Sound is not needed, then these pins should be
left as no connect (NC).
LM4548
www.national.com
9
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