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| 型號： | TLC32040I |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ANALOG INTERFACE CIRCUITS |
| 中文描述： | 模擬接口電路 |
| 文件頁數(shù)： | 16/33頁 |
| 文件大?。?/td> | 453K |
| 代理商： | TLC32040I |
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TLC32040C, TLC32040I, TLC32041C, TLC32041I
ANALOG INTERFACE CIRCUITS
SLAS014E – SEPTEMBER 1987 – REVISED MAY 1995
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Table 2. Gain Control Table Analog Input Signal Required for Full-Scale A/D Conversion
INPUT CONFIGURATIONS
CONTROL REGISTER BITS
d6
1
ANALOG INPUT
A/D CONVERSION
RESULT
d7
1
±
6 V
Full scale
Differential configuration
Analog input = IN+ – IN–
0
0
= AUX IN+ – AUX IN–
= AUX IN+ AUX IN
1
0
±
3 V
±
1.5 V
Full scale
0
1
Full scale
1
1
±
3 V
Half scale
Single-ended configuration
Analog input
= AUX IN+ – ANLG GND
= AUX IN+ ANLG GND
IN+
ANLG GND
0
0
1
0
±
3 V
±
1.5 V
Full scale
0
1
Full scale
In this example, Vref is assumed to be 3 V. In order to minimize distortion, it is recommended that the analog input not exceed 0.1 dB below full
scale.
Figure 2. IN+ and IN– Gain
Control Circuitry
–
+
+
–
Rfb
Rfb
R
R
IN+
IN–
To Multiplexer
Rfb = R for d6 = 1, d7 = 1
d6 = 0, d7 = 0
Rfb = 2R for d6 = 1, d7 = 0
Rfb = 4R for d6 = 0, d7 = 1
Figure 3. AUX IN+ and AUX IN–
Gain Control Circuitry
–
+
+
–
Rfb
Rfb
R
R
AUX IN+
AUX IN–
Rfb = R for d6 = 1, d7 = 1
d6 = 0, d7 = 0
Rfb = 2R for d6 = 1, d7 = 0
Rfb = 4R for d6 = 0, d7 = 1
To Multiplexer
(sin x)/x correction section
The AIC does not have (sin x)/x correction circuitry after the digital-to-analog converter.The (sin x)/x correction
can be accomplished easily and efficiently in digital signal processor (DSP) software. Excellent correction
accuracy can be achieved to a band edge of 3000 Hz by using a first-order digital correction filter. The results,
which are shown below, are typical of the numerical correction accuracy that can be achieved for sample rates
of interest. The filter requires only seven instruction cycles per sample on the TMS320 DSPs. With a 200-ns
instruction cycle, nine instructions per sample represents an overhead factor of 1.4% and 1.7% for sampling
rates of 8000 Hz and 9600 Hz, respectively. This correction adds a slight amount of group delay at the upper
edge of the 300–3000-Hz band.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TLC32040IN | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ANALOG INTERFACE CIRCUITS |
| TLC32040M | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ANALOG INTERFACE CIRCUIT |
| TLC32040MFK | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ANALOG INTERFACE CIRCUIT |
| TLC32040MJ | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ANALOG INTERFACE CIRCUIT |
| TLC32041C | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ANALOG INTERFACE CIRCUITS |
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