參數(shù)資料
型號(hào)： TLV320AIC29IRGZ
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQCC48
封裝： 7 X 7 MM, GREEN, PLASTIC, QFN-48
文件頁(yè)數(shù)： 29/87頁(yè)
文件大?。?/td> 1049K
代理商： TLV320AIC29IRGZ
TLV320AIC29
SLAS494B DECEMBER 2005 REVISED OCTOBER 2007
www.ti.com
35
Reference
The AIC29 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 AIC29 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 AIC29 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 AIC29 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
sampling of the signal. Moreover, additional times, such as the panel voltage stabilization time, can add
significantly to the time it takes to perform a conversion. Conversion time can vary depending upon the mode
in which the AIC29 is used. Throughout this data sheet, internal and conversion clock cycles are used to
describe the times that many functions take to execute. Considering the total system design, these times must
be taken into account by the user.
When both the audio ADC and DAC are powered down, the auxiliary ADC uses an internal oscillator for
conversions. However, to save power whenever audio ADC or DAC are powered up, the internal oscillator is
powered down and MCLK and BCLK are used to clock the auxiliary ADC.
The AIC29 uses the programmed value of bit D13 in control register 06H/page 2 and the PLL programmability
to derive a clock from MCLK. The various combinations are listed in Table 3.
Table 3. Conversion Clock Frequency
D13=0 (in control register 06H/page 2)
D13=1 (in control register 06H/page 2)
PLL enabled
160
13
×
P
K
MCLK
192
17
×
P
K
MCLK
PLL disabled
10
13
×
Q
MCLK
12
17
×
Q
MCLK
Temperature Measurement
In some applications, such as battery charging, a measurement of ambient temperature is required. The
temperature measurement technique used in the AIC29 relies on the characteristics of a semiconductor
junction operating at a fixed current level. The forward diode voltage (VBE) has a well-defined characteristic
versus temperature. The ambient temperature can be predicted in applications by knowing the 25
°C value of
the VBE voltage and then monitoring the variation of that voltage as the temperature changes.
The AIC29 offers two modes of temperature measurement. The first mode requires a single reading to predict
the ambient temperature. A diode, as shown in Figure 25, is used during this measurement cycle. This voltage
is typically 600 mV at +25
°C with a 20-A current through it. The absolute value of this diode voltage can vary
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