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| 型號： | TLV320AIC28IRGZR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC48 |
| 封裝： | 7 X 7 MM, GREEN, PLASTIC, QFN-48 |
| 文件頁數(shù)： | 27/85頁 |
| 文件大小： | 1053K |
| 代理商： | TLV320AIC28IRGZR |
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TLV320AIC28
SLAS418B FEBRUARY 2004 REVISED MAY 2005
www.ti.com
33
Analog Mixer
The analog mixer can be used to route the analog input selected for the ADC through an analog volume control
and then mix it with the audio DAC output. The analog mixer feature is available only if the single ended
microphone input or the AUX input is selected as the input to the ADC, not when the ADC input is configured
in fully-differential mode. This feature is available even if the ADC and DAC are powered down. The analog
volume control has a range from +12 dB to –34.5 dB in 0.5 dB steps plus mute and includes softstepping logic.
The internal oscillator is used for softstepping whenever the ADC and DAC are powered down.
Keyclick
A special circuit has been included for inserting a squarewave signal into the analog output signal path based
on register control. This functionality is intended for generating keyclick sounds for user feedback. Register
04H/Page 2 contains bits that control the amplitude, frequency, and duration of the squarewave signal. The
frequency of the signal can be varied from 62.5 Hz to 8 kHz and its duration can be programmed from 2 periods
to 32 periods. Whenever this register is written, the square wave is generated and coupled into the audio output.
The keyclick enable bit D15 of control register 04H/Page 2 is reset after the duration of a keyclick is played out.
This capability is available even when the ADC and DAC are powered down.
OPERATION—AUXILIARY MEASUREMENT
Auxiliary ADC Converter
The auxiliary analog inputs (battery voltage monitor, chip temperature, and auxiliary inputs) are provided via
a multiplexer to the successive approximation register (SAR) analog-to-digital (A/D) converter. The ADC
architecture is based on capacitive redistribution architecture, which inherently includes a sample/hold function.
The ADC is controlled by an ADC control register. Several modes of operation are possible, depending upon
the bits set in the control register. Channel selection, scan operation, averaging, resolution, and conversion rate
may all be programmed through this register. These modes are outlined in the sections below for each type of
analog input. The results of conversions made are stored in the appropriate result register.
Data Format
The AIC28 output data is in unsigned Binary format and can be read from registers over the SPI interface.
Reference
The AIC28 has an internal voltage reference that can be set to 1.25 V or 2.5 V, through the reference control
register.
The internal reference voltage should only be used in the single-ended mode for battery monitoring,
temperature measurement, and for utilizing the auxiliary inputs.
An external reference can also be applied to the VREF pin, and the internal reference can be turned off.
Variable Resolution
The AIC28 provides three different resolutions for the ADC: 8, 10 or 12 bits. Performing the conversions at lower
resolution reduce the amount of time it takes for the ADC to complete its conversion process, which lowers
power consumption.
Conversion Clock and Conversion Time
The AIC28 contains an internal 8 MHz clock, which is used to drive the state machines inside the device that
perform the many functions of the part. This clock is divided down to provide a clock to run the ADC. The division
ratio for this clock is set in the ADC control register. The ability to change the conversion clock rate allows the
user to choose the optimal value for resolution, speed, and power. If the 8 MHz clock is used directly, the ADC
is limited to 8-bit resolution; using higher resolutions at this speed does not result in accurate conversions. Using
a 4 MHz conversion clock is suitable for 10-bit resolution; 12-bit resolution requires that the conversion clock
run at 1 or 2 MHz.
Regardless of the conversion clock speed, the internal clock runs nominally at 8 MHz. The conversion time of
the AIC28 is dependent upon several functions. While the conversion clock speed plays an important role in
the time it takes for a conversion to complete, a certain number of internal clock cycles are needed for proper
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