LM49370RL/NOPB National Semiconductor, LM49370RL/NOPB Datasheet - Page 22
![IC AUDIO SUBSYSTEM 1.2W 49USMDXT](/photos/7/0/70002/pkg_rla_sml.jpg)
LM49370RL/NOPB
Manufacturer Part Number
LM49370RL/NOPB
Description
IC AUDIO SUBSYSTEM 1.2W 49USMDXT
Manufacturer
National Semiconductor
Series
Boomer®, PowerWise®r
Type
Class Dr
Datasheet
1.LM49370RLNOPB.pdf
(100 pages)
Specifications of LM49370RL/NOPB
Output Type
1-Channel (Mono) with Mono and Stereo Headphones
Max Output Power X Channels @ Load
1.2W x 1 @ 8 Ohm; 52mW x 2 @ 16 Ohm
Voltage - Supply
2.5 V ~ 5.5 V
Features
3D, Depop, I²C, I²S, Microphone, Mute, PCM, Shutdown, SPI, Standby, Volume Control
Mounting Type
Surface Mount
Package / Case
49-MicroSMDxt
Dc
07+
For Use With
LM49370RLEVAL - BOARD EVALUATION LM49370RL
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM49370RLTR
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- Download datasheet (3Mb)
www.national.com
12.4 COMMON CLOCK SETTINGS FOR THE DAC & ADC
When DAC_MODE = '00' (bits 7:6 of (0x00h)), the DAC has an over sampling ratio of 125 but requires a 250*fs clock at point B.
This allows a simple clocking solution as it will work from 12.000 MHz (common in most systems with Bluetooth or USB) at 48 kHz
exactly, the following table describes the clock required at point B for various clock sample rates in the different DAC modes:
Note: When DAC_MODE = '01' with the I
of the clock at point B. This divided by two DAC clock is used as the source clock for the audio port.
The over sampling ratio of the ADC is set by ADC MODE (bit 0 of 0x07h)). The table below shows the required clock frequency at
point C for the different ADC modes.
Methods for producing these clock frequencies are described in the PLL Section.
DAC Sample Rate (kHz)
ADC Sample Rate (kHz)
11.025
11.025
22.05
22.05
44.1
12
16
24
32
48
12
16
24
8
8
Clock Required at B (OSR = 125)
Clock Required at C (OSR = 125)
TABLE 4. Common DAC Clock Frequencies
TABLE 5. Common ADC Clock Frequencies
2
S or PCM interface operating as master, the stereo DAC operates at half the frequency
1.378125 MHz
2.75625 MHz
2.75625 MHz
5.5125 MHz
11.025 MHz
1.5 MHz
12 MHz
2 MHz
3 MHz
4 MHz
6 MHz
8 MHz
1 MHz
2 MHz
3 MHz
22
Clock Required at B (OSR = 128)
Clock Required at C (OSR = 128)
11.2896 MHz
2.8224 MHz
5.6448 MHz
12.288 MHz
1.4112 MHz
2.8224 MHz
2.048 MHz
3.072 MHz
4.096 MHz
6.144 MHz
8.192 MHz
1.024 MHz
1.536 MHz
2.048 MHz
3.072 MHz
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