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參數(shù)資料
| 型號(hào)： | TSC2117IRGZR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, QCC48 |
| 封裝： | 7 X 7 MM, GREEN, PLASTIC, VQFN-48 |
| 文件頁(yè)數(shù)： | 141/192頁(yè) |
| 文件大小： | 2728K |
| 代理商： | TSC2117IRGZR |
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0
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-30
-40
-50
-60
-70
Magnitude-dB
0
0.2
0.4
0.6
0.8
1
1.2
1.4
FrequencyNormalizedw.r.t.FS
DACChannelResponseforInterpolationFilterC
(Redlinecorrespondsto-43dB)
5.6.2
DAC Digital-Volume Control
TSC2117
Low-Power Audio Codec With Embedded miniDSP, Stereo Class-D
Speaker Amplifier, and Smart Four-Wire Touch-Screen Controller
SLAS550A – APRIL 2009 – REVISED JUNE 2009
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
× f
S (corresponds
to 80 kHz), more than sufficient for audio applications.
Figure 5-32. Frequency Response of DAC Interpolation Filter C
Table 5-30. Specification for DAC Interpolation Filter C
Parameter
Condition
Value (Typical)
Unit
Filter-gain pass band
0
… 0.35 f
S
±0.03
dB
Filter-gain stop band
0.6 fS … 1.4 fS
–43
dB
Filter group delay
13/fS
s
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/registers 65 and 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 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.
APPLICATION INFORMATION
52
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSC2117IRGZT | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 4-Wire Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| TSC2117IRGZT | 制造商:Texas Instruments 功能描述:Touch Screen Controller IC |
| TSC22 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EURO TERMINAL BLOCKS |
| TSC2200 | 制造商:BB 制造商全稱:BB 功能描述:PDA ANALOG INTERFACE CIRCUIT |
| TSC2200EVM | 功能描述:觸摸傳感器開(kāi)發(fā)工具 Touch Screen Contr Eval Mod RoHS:否 制造商:Cypress Semiconductor 工具用于評(píng)估: 接口類型: 工作電壓: 最大工作溫度: |
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