參數(shù)資料
型號: TLV320AIC3120IRHBR
廠商: TEXAS INSTRUMENTS INC
元件分類: 音頻/視頻放大
英文描述: AUDIO AMPLIFIER, PQCC32
封裝: 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁數(shù): 94/150頁
文件大?。?/td> 1507K
代理商: TLV320AIC3120IRHBR
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)
SLAS653 – FEBRUARY 2010
www.ti.com
5.6.1.4.3 Interpolation Filter C
Filter C is specifically designed for the 192-ksps mode. The pass band extends up to 0.4 × fS
(corresponds to 80 kHz), more than sufficient for audio applications.
Table 5-25. 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 5-29. Frequency Response of DAC Interpolation Filter C
5.6.2
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 mono-channel
DAC volume can be controlled by writing to page 0 / register 65, bits D7–D0. DAC muting and setting up a
master gain control to control the mono channel is done by writing to page 0 / register 64, bits D3 and D1.
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 controlled by register writes to page 0 / register 65. 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 mono channel. This information alerts the host when
the part 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.)
48
APPLICATION INFORMATION
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TLV320AIC3120
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