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參數(shù)資料
| 型號： | LTC1966MPMS8#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)： | 17/38頁 |
| 文件大?。?/td> | 387K |
| 代理商： | LTC1966MPMS8#TRPBF |
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LTC1966
24
1966fb
applicaTions inForMaTion
To do this, inject current into the output. As shown in
Figure 21, the charge pump output impedance is 170kΩ,
with the computational feedback cutting the closed loop
output impedance to the 85kΩ specification. By injecting
30nAofcurrentintothis170Ω,withzeroinput,a5mVoffset
Figure 23 shows an analog implementation of this with
the offset and gain errors corrected; only the slight, but
necessary, degradation in nonlinearity remains. The cir-
cuit works by creating approximately 300mV of bias at
the junction of the 10MΩ resistors when the LTC1966’s
input/output are zero. The 10MΩ resistor to the LTC1966
output therefore feeds in 30nA. The loading of this resis-
tor causes a slight reduction in gain which is corrected,
as is the nominal 2.5mV offset, by the LT1494 op amp.
is created at the output feedback point, which is sufficient
to overcome the 5mV minimum signal level. With large
enough input signals, the computational feedback cuts
the output impedance to 85kΩ so the transfer function
asymptotes will have an output offset of 2.5mV, as shown
in Figure 22. This is the additional, predictable, VOOS that
is added, and should be subtracted from the RMS results,
either digitally, or by an analog means.
Figure 21. Behavioral Block Diagram of LTC1966
Figure 22a. DC Transfer Function with IINJECT = 30nA
Figure 22b. AC Transfer Function with IINJECT = 30nA
Figure 23. Monotonic AC Response with Offset
and Gain Corrected
1F
1966 F23
5V
–5V
5V
85k
10M
LT1494
750k
VOUT
84.5k
100pF
OUT
LTC1966
VDD
VSS
EN
GND
OUTRTN
IN1
IN2
–
+
10M
LT1494
5V
–5V
RMS TO DC
CONVERSION
CAVE
IINJECT DC
170k
CHARGE
PUMP
LTC1966
OUTPUT
IN1
IN2
1966 F21
VIN (mV DC)
–20
0
V OUT
(mV
DC)
10
20
15
–15
–10
20
1966 F22a
5
0
5
–5
10
15
5mV MIN
IDEAL
ASYMPTOTES
SHIFTED +2.5mV
VIN (mV AC)
0
V OUT
(mV
DC)
10
20
15
5
20
1966 F22b
5
10
15
5mV MIN
IDEAL
ASYMPTOTES
SHIFTED +2.5mV
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相關代理商/技術參數(shù) |
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| LTC1967CMS8 | 功能描述:IC CONVERTER RMS-DC PREC 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉換器 系列:- 標準包裝: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） 供應商設備封裝:16-SOIC W 包裝:管件 |
| LTC1967CMS8#PBF | 功能描述:IC CONVERTER RMS-DC PREC 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉換器 系列:- 標準包裝: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） 供應商設備封裝:16-SOIC W 包裝:管件 |
| LTC1967CMS8#TR | 功能描述:IC CONVERTER RMS-DC PREC 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉換器 系列:- 標準包裝: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） 供應商設備封裝:16-SOIC W 包裝:管件 |
| LTC1967CMS8#TRPBF | 功能描述:IC CONVERTER RMS-DC PREC 8MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - RMS 至 DC 轉換器 系列:- 標準包裝: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） 供應商設備封裝:16-SOIC W 包裝:管件 |
| LTC1967CMS8PBF | 制造商:Linear Technology 功能描述:RMS-DC converter, LTC1967 40kHz MSOP |
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