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參數(shù)資料
| 型號： | TLV320DAC3100IRHBT |
| 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)： | 24/97頁 |
| 文件大?。?/td> | 1134K |
| 代理商： | TLV320DAC3100IRHBT |
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0
–10
–20
–30
–40
–50
–60
–70
Magnitude
–
dB
0
0.2
0.4
0.6
0.8
1
1.2
1.4
FrequencyNormalizedtof
S
DACChannelResponseforInterpolationFilterC
(RedLineCorrespondsto –43dB)
SLAS671 – FEBRUARY 2010
www.ti.com
Table 5-17. Specification for DAC Interpolation Filter C
Parameter
Condition
Value (Typical)
Unit
Filter-gain pass band
0 … 0.35 fS
±0.03
dB
Filter-gain stop band
0.6 fS … 1.4 fS
–43
dB
Filter group delay
13/fS
s
Figure 5-16. Frequency Response of DAC Interpolation Filter C
5.5.2
DAC Digital-Volume Control
The DAC has a digital volume-control block which implements programmable gain. Each channel has an
independent volume control that can be varied from 24 dB to –63.5 dB in 0.5-dB steps. The left-channel
DAC volume can be controlled by writing to page 0 / register 65, bits D7–D0. The right-channel DAC
volume can be controlled by writing to page 0 / register 66, bits D7–D0. DAC muting and setting up a
master gain control to control both channels is done by writing to page 0 / register 64, bits D3–D0. The
gain is implemented with a soft-stepping algorithm, which only changes the actual volume by 0.125 dB per
input sample, either up or down, until the desired volume is reached. The rate of soft-stepping can be
slowed to one step per two input samples by writing to page 0 / register 63, bits D1–D0. Note that the
default source for volume-control level settings is control by register writes (page 0 / register 65 and
page 0 / register 66 to control volume). Use of the VOL/MICDET pin to control the DAC volume is ignored
until the volume control source selected has been changed to pin control (page 0 / register 116, bit
D7 = 1). This functionality is shown in Figure 1-1.
During soft-stepping, the host does not receive a signal when the DAC has been completely muted. This
may be important if the host must mute the DAC before making a significant change, such as changing
sample rates. In order to help with this situation, the device provides a flag back to the host via a
read-only register, page 0 / register 38, bit D4 for the left channel and bit D0 for the right channel. This
information alerts the host when the device has completed the soft-stepping and the actual volume has
reached the desired volume level. The soft-stepping feature can be disabled by writing to page 0 /
register 63, bits D1–D0.
If soft-stepping is enabled, the CODEC_CLKIN signal should be kept active until the DAC power-up flag is
cleared. When this flag is cleared, the internal DAC soft-stepping process is complete, and
CODEC_CLKIN can be stopped if desired. (The analog volume control can be ramped down using an
internal oscillator.)
30
APPLICATION INFORMATION
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TLV320DAC3100
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