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參數(shù)資料
| 型號(hào)： | TWL1103TPBSRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP32 |
| 封裝： | PLASTIC, TQFP-32 |
| 文件頁數(shù)： | 11/30頁 |
| 文件大?。?/td> | 458K |
| 代理商： | TWL1103TPBSRQ1 |
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TWL1103T Q1
VOICEBAND AUDIO PROCESSOR (VBAP)
SGLS120B APRIL 2002 REVISED APRIL 2008
19
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
I2C interface.
Table 3. Power-Up and Power-Down Procedures (VDD = 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
Power up
Set bit 1 = 0 in power control register, EAR2 enabled
14.6 mW
Power down
Set bit 7 = 1 in TXPGA control register and bit 0 = 0
1.35
W
Power down
Set bit 7 = 0 in TXPGA control register and bit 0 = 0
67.5
W
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 TX filter and PGA sidetone register to logic high
enables this function.
conversion laws
The device can be programmed either for a 15-bit linear or 8-bit
(-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. A
microphone can be 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) |
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| TWL1103T-Q1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Automotive Catalog Voice-Band Audio Processor (VBAP) |
| TWL1106 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:VOICE-BAND AUDIO PROCESSOR (VBAPa?￠) |
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| TWL1107PW | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
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