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參數(shù)資料
| 型號： | LTC1411 |
| 廠商： | Linear Integrated Systems |
| 元件分類： | ADC |
| 英文描述： | Single Supply 14-Bit 2.5Msps ADC |
| 中文描述： | 單電源14位2.5Msps模數(shù)轉(zhuǎn)換器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 230K |
| 代理商： | LTC1411 |
11
LTC1411
1411f
LT6203:
Dual 100MHz, Low Noise, Low Power Op Amp.
Specified at 3V, 5V and
±
5V supplies. 1.9nV/
√
Hz noise
voltage.
Programmable Input Range
The LTC1411 has two logic input pins (PGA0 and PGA1)
that are used to select one of four analog input ranges.
These input ranges are set by changing the reference
voltage that is applied to the internal DAC of the ADC
(REFCOM2). For the “0dB” setting the internal DAC sees
the full reference voltage of 4V. The analog input range is
0.7V to 4.3V with A
IN–
= 2.5V. This corresponds to an input
span of
±
1.8V with respect to the voltage applied to A
IN–
. For the “–3dB” setting the internal reference is reduced
to 0.707 4V = 2.9V. Likewise the input span is reduced
to
±
1.28V. The following table lists the input span with
respect to A
IN–
for the different PGA0 and PGA1 settings.
Table 1. Input Spans for LTC1411
INPUT
SPAN
±
1.8V
±
1.28V
±
0.9V
±
0.64V
REFCOM2
VOLTAGE
4V
2.9V
2V
1.45V
PGA0
5V
5V
0V
0V
PGA1
5V
0V
5V
0V
LEVEL
0dB
–3dB
–6dB
–9dB
When changing from one input span to another, more time
is needed for the REFCOM2 pin to reach the correct level
because the bypass capacitor on the pin needs to be charged
or discharged. Figure 6 shows the recommended capaci-
tors at the REFCOM1 and REFCOM2 pins (10
μ
F each).
When –6dB or –9dB is selected, the voltage at REFCOM1
(see Figure 2) must first settle before REFCOM2 reaches
the correct level. The typical delay is about 700ms.
When the REFCOM2 level is changed from 2.9V to 4V
(changing PGA setting from –3dB to 0dB), the typical delay
is 0.6ms. However, if the voltage at REFCOM2 is changed
from 4V to 2.9V (changing PGA setting from 0dB to –3dB)
only a 60
μ
A sink current is present to discharge the 10
μ
F
bypass capacitor. In this case, the delay will be 11ms.
Internal Reference
The LTC1411 has an on-chip, temperature compensated,
curvature corrected, bandgap reference that is factory
trimmed to 2.500V. If this REFOUT pin is used to drive the
A
IN–
pin, a 22
μ
F tantalum bypass capacitor is required and
this REFOUT voltage sets the bipolar zero for the ADC.
The REFIN pin is connected to the reference buffer through
a 2k resistor and two PGA switches. The REFIN pin can be
connected to REFOUT directly or to an external reference.
Figure 6 shows the reference and buffer structure for the
LTC1411. The input to the reference buffer is either REFIN
or 1/2 of REFIN depending on the PGA selection. The
REFCOM1 pin bypassed with a 10
μ
F tantalum capacitor
helps reduce the noise going into the buffer. The reference
buffer has a gain of 1.62 or 1.15 (depends on PGA
selection). It is compensated at the REFCOM2 pin with a
10
μ
F tantalum capacitor. The input span of the ADC is set
by the output voltage of this REFCOM2 voltage. For a 2.5V
input at the REFIN pin, the REFCOM2 will have 4V output
for PGA1 = PGA0 = 5V and the ADC will have a span of 3.6V.
APPLICATIOU
W
U
U
Figure 6. Reference Structure for the LTC1411
for PGA1 = PGA0 = 5V
REFCOM2
10
μ
F
1411 F06
REFCOM1
REFIN*
REFOUT
10
μ
F
THIS PIN CAN BE TIED TO REFOUT OR AN EXTERNAL SOURCE
A 22
μ
F CAPACITOR IS NEEDED IF REFOUT IS USED TO DRIVE A
IN–
**
*
22
μ
F**
2k
5k
5k
2.5V
BANDGAP
REFERENCE
X1.62
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1411CG | 功能描述:IC A/D CONV 14BIT 2.5MSPS 36SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
| LTC1411CG#PBF | 功能描述:IC ADC 14BIT 2.5MSPS 36SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
| LTC1411CG#TR | 功能描述:IC A/D CONV 14BIT 2.5MSPS 36SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
| LTC1411CG#TRPBF | 功能描述:IC A/D CONV 14BIT 2.5MSPS 36SSOP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
| LTC1411IG | 功能描述:IC A/D CONV 14BIT 2.5MSPS 36SSOP RoHS:否 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標準包裝:1 系列:- 位數(shù):14 采樣率（每秒）:83k 數(shù)據(jù)接口:串行，并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:95mW 電壓電源:雙 ± 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:28-DIP（0.600"，15.24mm） 供應(yīng)商設(shè)備封裝:28-PDIP 包裝:管件 輸入數(shù)目和類型:1 個單端，雙極 |
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