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參數資料
| 型號： | UDA1335H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 消費家電 |
| 英文描述： | Universal Serial Bus USB Audio Playback Recording Peripheral APRP |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | 14 X 20 MM, 2.80 MM HEIGHT, PLASTIC, SOT-319-2, QFP-64 |
| 文件頁數： | 19/44頁 |
| 文件大?。?/td> | 254K |
| 代理商： | UDA1335H |
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1998 Aug 28
19
Philips Semiconductors
Preliminary specification
Universal Serial Bus (USB) Audio
Playback Recording Peripheral (APRP)
UDA1335H
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bBASS
BASS USB HOST
(dB)
BASS USB APRP
(dB)
B7
B6
B5
B4
B3
B2
B1
B0
Dynamic bass boost control
Bass boost is one of the sound features as defined in the
“USB Device Class Definition for Audio Devices”
The bass boost control request data
bBassBoost
controls
the position of the bass boost switch. The position can be
either on or off. When
bBassBoost
is true the bass boost
is activated. When
bBassBoost
is false the bass boost is
off.
When clipping prevention is active, the bass is reduced to
avoid clipping with high volume settings. Bass boost is
selectable via the configuration map.
Clipping prevention
When clipping prevention is ON and the sum of bass plus
volume gives clipping, the bass is reduced. When clipping
prevention is ON and the sum of treble plus volume gives
clipping, the treble is reduced. Clipping prevention and
clipping level are selectable via the configuration map.
For more information about clipping prevention and the
clipping level see the application documentation.
De-emphasis
De-emphasis is one of the properties which is not
supported by the USB. De-emphasis for 44.1 kHz can be
predefined in the configuration map selected at start-up of
the UDA1335H.
Start-up and configuration of the UDA1335H
S
TART
-
UP OF THE
UDA1335H
After power-on, an internal power-on reset signal becomes
HIGH after a certain RC time (R = 5000
, C = C
ref
).
During 20 ms after power-on reset the UDA1335H has to
initiate the internal settings. After the power-on reset the
UDA1335H becomes master of the I
2
C-bus.
The UDA1335H tries to read the eventually connected
I
2
C-bus EEPROM and if an dedicated EEPROM is
detected, the internal descriptors are overwritten and the
selected port configuration is applied. If no EEPROM is
detected, the UDA1335H tries to read the logic levels of
GP3 and GP4. A choice can be made from four
configuration maps via these two GP pins.
C
ONFIGURATION SELECTION OF THE
UDA1335H
VIA A DIODE
MATRIX
The UDA1335H uses a configuration map to hold a
number of specific configurable data on hardware,
product, component and USB configuration level.
At start-up, without EEPROM, the UDA1335H will scan the
logic levels of GP3 and GP4. With these two GP pins it is
possible to select one of the four possible configuration
maps which are held in the external (E)PROM. This
selection can be achieved via a diode matrix (see Fig.5).
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相關代理商/技術參數 |
參數描述 |
|---|---|
| UDA1338H | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Multichannel audio coder-decoder |
| UDA1338H/N1 | 制造商:NXP Semiconductors 功能描述:IC CODEC AUDIO 44QFP |
| UDA1338H/N1,518 | 功能描述:音頻放大器 MULTICHANNEL CODEC RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| UDA1338H/N1,557 | 功能描述:音頻放大器 MULTICHANNEL CODEC RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| UDA1338HB | 功能描述:音頻放大器 MULTICHANNEL CODEC RoHS:否 制造商:STMicroelectronics 產品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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