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參數(shù)資料
| 型號(hào)： | MSC1211Y2PAGR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁(yè)數(shù)： | 34/111頁(yè) |
| 文件大?。?/td> | 1113K |
| 代理商： | MSC1211Y2PAGR |
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MSC1211, MSC1212
MSC1213,MSC1214
SBAS323G JUNE 2004 REVISED OCTOBER 2007
www.ti.com
29
It will then use the Sinc2 followed by the Sinc3 filter to
improve noise performance. This combines the low-noise
advantage of the Sinc3 filter with the quick response of the
Fast Settling Time filter. The frequency response of each
filter is shown in Figure 16.
VOLTAGE REFERENCE
The MSC1211/12/13/14 can use either an internal or
external
voltage
reference.
The
voltage reference
selection is controlled via ADC Control Register 0
(ADCON0,
SFR
DCh).
The
default
power-up
configuration for the voltage reference is 2.5V internal.
The internal voltage reference can be selected as either
1.25V or 2.5V. The analog power supply (AVDD) must be
within the specified range for the selected internal voltage
reference. The valid ranges are: VREF = 2.5 internal
(AVDD = 3.3V to 5.25V) and VREF = 1.25 internal
(AVDD = 2.7V to 5.25V). If the internal VREF is selected,
then AGND must be connected to REF IN. The
REFOUT/REF IN+ pin should also have a 0.1
F capacitor
connected to AGND as close as possible to the pin. If the
internal VREF is not used, then VREF should be disabled in
ADCON0.
If the external voltage reference is selected, it can be used
as either a single-ended input or differential input, for
ratiometric measures. When using an external reference,
it is important to note that the input current will increase for
VREF with higher PGA settings and with a higher modulator
frequency. The external voltage reference can be used
over
the
input
range
specified
in
the
Electrical
Characteristics section.
For applications requiring higher performance than that
obtainable from the internal reference, use an external
precision reference such as the REF50xx. The internal
reference performance can be observed in the noise (and
ENOB) versus input signal graphs in the Typical
Characteristics section. All of the other ENOB plots are
obtained with the inputs shorted together. By shorting the
inputs, the inherent noise performance of only the ADC
can be determined and displayed. When the inputs are not
shorted, the extra noise comes from the reference. As can
be seen in the ENOB vs Input Signal graph, the external
reference adds about 0.7 bits of noise, whereas the
internal reference adds about 2.3 bits of noise. This ENOB
performance of 19.4 represents 21.16 bits of noise. With
an LSB of 298nV, that translates to 6.3
V or a
peak-to-peak noise of almost 42
V. The internal reference
is initialized each time power is applied. That initialization
can cause a shift in the output that is within the specified
accuracy. An external reference provides the best noise,
drift, and repeatability performance for high-precision
applications.
SINC3 FILTER RESPONSE
(
3dB = 0.262 f
DATA)
f
DATA
0
20
40
60
80
100
120
0
1
2
345
0
1
2
345
0
1
2
345
Ga
in
(d
B
)
SINC2 FILTER RESPONSE
(
3dB = 0.318 f
DATA)
f
DATA
0
20
40
60
80
100
120
Ga
in
(d
B
)
FAST SETTLING FILTER RESPONSE
(
3dB = 0.469 f
DATA)
f
DATA
0
20
40
60
80
100
120
NOTE: f
DATA = Normalized Data Output Rate = 1/tDATA
Ga
in
(d
B
)
Figure 16. Filter Frequency Responses
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| MSC1211Y2PAGRG4 | 功能描述:數(shù)據(jù)轉(zhuǎn)換系統(tǒng) Precision ADC & DACs w/8051 CPU & Flash RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率:0.001 MSPs 分辨率:24 bit 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MSC1211Y2PAGT | 功能描述:數(shù)據(jù)轉(zhuǎn)換系統(tǒng) Precision ADC & DACs w/8051 CPU & Flash RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率:0.001 MSPs 分辨率:24 bit 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MSC1211Y2PAGTG4 | 功能描述:數(shù)據(jù)轉(zhuǎn)換系統(tǒng) 24B ADC and Quad 16B DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率:0.001 MSPs 分辨率:24 bit 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MSC1211Y3 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Precision Analog-to-Digital Converter (ADC) and Digital-to-Analog Converters (DACs) with 8051 Microcontroller and Flash Memory |
| MSC1211Y3PAGR | 功能描述:數(shù)據(jù)轉(zhuǎn)換系統(tǒng) Precision ADC & DACs w/8051 CPU & Flash RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率:0.001 MSPs 分辨率:24 bit 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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