參數(shù)資料
型號(hào): TLV320DAC3100IRHBR
廠商: TEXAS INSTRUMENTS INC
元件分類: DAC
英文描述: DAC WITH PROGRAMMABLE PLL, PQCC32
封裝: 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁數(shù): 46/97頁
文件大?。?/td> 1134K
代理商: TLV320DAC3100IRHBR
÷N
BCLK
DAC_CLK
DAC_MOD_CLK
BDIV_CLKIN
N = 1, 2, ..., 127, 128
B0362-01
SLAS671 – FEBRUARY 2010
www.ti.com
The DAC modulator is clocked by DAC_MOD_CLK. For proper power-up operation of the DAC channel,
DAC_MOD_CLK must be enabled by configuring the NDAC and MDAC clock dividers (page 0 /
register 11, bit D7 = 1 and page 0 / register 12, bit D7 = 1). When the DAC channel is powered down, the
device internally initiates a power-down sequence for proper shutdown. During this shutdown sequence,
the NDAC and MDAC dividers must not be powered down, or else a proper low-power shutdown may not
take place. The user can read back the power-status flag at page 0 / register 37, bit D7 and page 0 /
register 37, bit D3. When both the flags indicate power-down, the MDAC divider may be powered down,
followed by the NDAC divider.
In general, for proper operation, all the root clock dividers should be powered down only after the child
clock dividers have been powered down.
The TLV320DAC3100 also has options for routing some of the internal clocks to the GPIO1 pin to be used
as general-purpose clocks in the system. The feature is shown in Figure 5-22.
Figure 5-21. BCLK Output Options
In the mode when the TLV320DAC3100 is configured to drive the BCLK pin (page 0 / register 27,
bit D3 = 1), it can be driven as the divided value of BDIV_CLKIN. The division value can be programmed
in page 0 / register 30, bits D6–D0 from 1 to 128. BDIV_CLKIN can itself be configured to be one of
DAC_CLK (DAC processing clock), DAC_MOD_CLK by configuring the BDIV_CLKIN multiplexer in page
0 / register 29, bits D1–D0. Additionally, a general-purpose clock can be driven out on GPIO1.
This clock can be a divided-down version of CDIV_CLKIN. The value of this clock divider can be
programmed from 1 to 128 by writing to page 0 / register 26, bits D6–D0. CDIV_CLKIN can itself be
programmed as one of the clocks among the list shown in Figure 5-22. This can be controlled by
programming the multiplexer in page 0 / register 25, bits D2–D0.
50
APPLICATION INFORMATION
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TLV320DAC3100
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