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參數(shù)資料
| 型號： | TWL1110TQFP |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | VOICE-BAND AUDIO PROCESSOR VBAPE |
| 中文描述： | 語音頻帶音頻處理器VBAPE |
| 文件頁數(shù)： | 20/37頁 |
| 文件大?。?/td> | 496K |
| 代理商： | TWL1110TQFP |
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TWL1110
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLWS103 – NOVEMBER 2000
20
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
power-on initialization
An external reset with a minimum pulse width of 500 ns must be applied to the active low RESET terminal to
guarantee reset upon power on. All registers are set with default values upon external reset initialization.
The desired selection for all programmable functions can be initialized prior to a power-up command using the
control interface.
Table 1. Power Up and Power Down Procedures (V
DD
= 2.7 V, earphone amplifier unloaded)
DEVICE STATUS
PROCEDURE
MAXIMUM POWER
CONSUMPTION
Power up
Set bit 1 = 1 in power control register, EAR1 enabled
16.2 mW
Set bit 1 = 0 in power control register, EAR2 enabled
14.6 mW
1.35
μ
W
67.5
μ
W
Power down
Set bit 7 = 1 in TXPGA control register and bit 0 = 0
Set bit 7 = 0 in TXPGA control register and bit 0 = 0
In addition to resetting the power down bit in the power control register, loss of MCLK (no transition detected)
automatically enters the device into a power down state with PCMO in the high impedance state. If during a pulse
code modulation (PCM)
data transmit cycle an asynchronous power down occurs, the PCM interface remains
powered up until the PCM data is completely transferred.
An additional power down mode overrides the MCLK detection function. This allows the device to enter the
power down state without regard to MCLK. Setting bit 7 of the TXPGA sidetone register to logic high enables
this function.
internal reference current setting terminal
Use a 100-k
precision resistor to connect the REXT pin to GND.
conversion laws
The device can be programmed for either a 15-bit linear or and 8-bit
(μ
-law or A-law) companding mode. The
companding operation approximates the CCITT G.711 recommendation. The linear mode operation uses a
15-bit twos-complement format.
transmit operation
microphone input
The microphone input stage is a low-noise differential amplifier that provides a preamplifier gain of 23.5 dB. It
is recommended that a microphone capacitively connected to the MIC1N and MIC1P inputs, while the MIC2N
and MIC2P inputs can be used to capacitively connect a second microphone or an auxiliary audio circuit.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TWL1200 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SDIO, UART, AND AUDIO VOLTAGE-TRANSLATION TRANSCEIVER |
| TWL1200IPFBRQ1 | 功能描述:轉(zhuǎn)換 - 電壓電平 SDIO,UART,and Audio Vltg-Level Xcvr RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MLF-8 |
| TWL1200-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SDIO, UART, AND AUDIO VOLTAGE-TRANSLATION TRANSCEIVER |
| TWL1200YFFR | 功能描述:轉(zhuǎn)換 - 電壓電平 SDIO UART & Aud Vltg Level Transceiver RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MLF-8 |
| TWL1200ZQCR | 功能描述:轉(zhuǎn)換 - 電壓電平 SDIO UART & Audio Vltg-Level Xcvr RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MLF-8 |
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