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參數(shù)資料
| 型號(hào)： | LTC1966HMS8#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 模擬專用變換器 |
| 英文描述： | RMS TO DC CONVERTER, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 22/38頁 |
| 文件大小： | 387K |
| 代理商： | LTC1966HMS8#TRPBF |
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LTC1966
29
1966fb
As is shown in Figure 25b, where the LTC2420 is set to
continuously convert by grounding the CS pin. The gain
error will be less if CS is driven at a slower rate, however,
the rate should either be consistent or at a rate low enough
that the LTC1966 and its output capacitor have fully settled
by the beginning of each conversion, so that the loading
errors are consistent.
Note that in this circuit, the input current of the LTC2420
is being used to assure monotonicity. The LTC2420 ZIN of
16.6MΩ is effectively connected to half the reference volt-
age,sowhentheLTC1966haszerosignal,500mV/16.6MΩ
= 30nA is provided.
Alternatively, a 5V VREF can be used, but in this case the
LTC1966 output span will only use 20% of the LTC2420’s
input voltage range. Furthermore, if the OUTRTN remains
grounded, the injected current with zero signal will be
150nA, resulting in 5× the offset error and nonlinearity
shown in Figure 22.
In both of the circuits of Figure 25, a guard ring only has to
encircle three terminals, the LTC1966 output, the top of the
averaging capacitor, and the ADC input. Figure 26 shows
the top copper patterns for example PCB layouts of each.
The low power consumption of the LTC1966 makes it well
suitedforbatterypoweredapplications,anditsslowoutput
(DC) makes it an ideal candidate for a micropower ADC.
applicaTions inForMaTion
Figure 26b. PCB Layout of Figure 25b with Guard Ring
Figure 26a. PCB Layout of Figure 25a with Guard Ring
Figure 10 in Application Note 75, for instance, details a
10-bit ADC with a 35ms conversion time that uses just
29A of supply current. Such an ADC may also be of use
within a 4mA to 20mA loop.
Other types of ADCs sample the input signal once and
performaconversiononthatonesample.WiththeseADCs
(Nyquist ADCs), a post filter will be needed in most cases
to reduce the peak error with low input frequencies. The
DC accurate filter of Figure 14 is attractive from an error
standpoint, but it increases the impedance at the ADC
input. In most cases, the buffered post filter of Figure13
will be more appropriate for use with Nyquist analog-to-
digital converters.
SYSTEM CALIBRATION
The LTC1966 static accuracy can be improved with end
system calibration. Traditionally, calibration has been
done at the factory, or at a service depot only, typically
using manually adjusted potentiometers. Increasingly,
systems are being designed for electronic calibration
where the accuracy corrections are implemented in digital
code wherever possible, and with calibration DACs where
necessary. Additionally, many systems are now designed
for self calibration, in which the calibration occurs inside
the machine, automatically without user intervention.
LTC1966
MS8
1966 F26b
LTC2420
SO8
1f
CAVE
1966 F26a
1f
CAVE
LTC1966
MS8
ICL7106
MQFP
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1966MPMS8#PBF | RMS TO DC CONVERTER, PDSO8 |
| LTC1966HMS8#PBF | RMS TO DC CONVERTER, PDSO8 |
| LTC1966MPMS8#TRPBF | RMS TO DC CONVERTER, PDSO8 |
| LTC2141IUP-12#PBF | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
| LTC2141CUP-12#TRPBF | 2-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQCC64 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1966IMS8 | 功能描述:IC PREC RMS/DC CONV MCRPWR 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
| LTC1966IMS8#PBF | 功能描述:IC PREC RMS/DC CONV MCRPWR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
| LTC1966IMS8#TR | 功能描述:IC PREC RMS/DC CONV MCRPWR 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
| LTC1966IMS8#TRPBF | 功能描述:IC PREC RMS/DC CONV MCRPWR 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:46 系列:- 電流 - 電源:1.2mA 電源電壓:±18 V，36 V 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC W 包裝:管件 |
| LTC1966IMS8PBF | 制造商:Linear Technology 功能描述:RMS-to-DC Converter Prec. uPower MSOP8 |
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