參數(shù)資料
型號(hào)： TLV320AIC34_1
廠商： Texas Instruments, Inc.
元件分類： Codec
英文描述： FOUR-CHANNEL, LOW-POWER AUDIO CODEC FOR PORTABLE AUDIO/TELEPHONY
中文描述： 四通道，低功耗音頻編解碼器的便攜式音頻/電話
文件頁(yè)數(shù)： 31/94頁(yè)
文件大?。?/td> 905K
代理商： TLV320AIC34_1
www.ti.com
(K
R) / P
′
PLL_CLKIN
CODEC
CODEC_CLKIN
PLL_OUT
MCLK_x
BCLK_x
PLL_IN
B0153-02
DAC f
S
ADC f
S
CODEC_CLK = 256
f
′
S(ref)
CLKDIV_OUT
1/8
PLLDIV_OUT
CLKDIV_CLKIN
K = J.D
J = 1, 2, 3, ...., 62, 63
D = 0000, 0001, ...., 9998, 9999
R = 1, 2, 3, 4, ...., 15, 16
P = 1, 2, ...., 7, 8
WCLK =
/NCODEC
CODEC
Set NCODEC = NADC = NDAC = 1, 1.5, 2, ...., 5.5, 6
DAC DRA => NDAC = 0.5
ADC DRA => NADC = 0.5
= DAC
= ADC
f
f
f
f
S(ref)
S
S
S
2 / Q
Q = 2, 3,….., 16, 17
CLKDIV_IN
2 / (N
M)
′
CLKOUT_IN
CLKMUX_OUT
M = 1, 2, 4, 8
N = 2, 3, ..., 16, 17
GPIO1_x
GPIO2_x
CLKOUT
TLV320AIC34
SLAS538A–OCTOBER 2007–REVISED NOVEMBER 2007
Figure 25. Audio Clock Generation Processing
The part can accept an MCLK_x input from 512 kHz to 50 MHz, which can then be passed through either a
programmable divider or a PLL, to get the proper internal audio master clock needed by the part. The BCLK_x or
GPIO2_x inputs can also be used to generate the internal audio master clock.
This design also allows the PLL to be used for an entirely separate purpose in a system, if the audio codec is not
powered up. The user can supply a separate clock to GPIO2_x, route this through the PLL, with the resulting
output clock driven out GPIO1_x, for use by other devices in the system.
A primary concern is proper operation of the codec at various sample rates with the limited MCLK_x frequencies
available in the system. This device includes a highly programmable PLL to accommodate such situations easily.
The integrated PLL can generate audio clocks from a wide variety of possible MCLK_x inputs, with particular
focus paid to the standard MCLK_x rates already widely used.
When the PLL is disabled,
f
S(ref)
= CLKDIV_IN / (128
×
Q)
Where Q = 2, 3, …, 17
CLKDIV_IN can be MCLK_x, BCLK_x, or GPIO2_x, selected by page 0, register 102, bits D7–D6.
Copyright 2007, Texas Instruments Incorporated
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Product Folder Link(s):
TLV320AIC34
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