Datasheet > LTC1968

LTC1968

更新时间： 2023-12-20 18:44:06

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
28页	296K
描述
精准型、宽带宽、 RMS 至 DC 转换器

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中文翻译

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数据手册

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LTC1968 数据手册

LTC1968

PI FU CTIO S

GND (Pin 1): Ground. The power return pin.

OUT RTN (Pin 6): Output Return. The output voltage is

created relative to this pin. The V_OUTand OUT RTN pins

are not balanced and this pin should be tied to a low

impedance, both AC and DC. Although Pin 6 is often tied

to GND, it can also be tied to any arbitrary voltage:

GND < OUT RTN < (V⁺– Max Output)

V⁺(Pin 7): Positive Voltage Supply. 4.5V to 5.5V.

IN1 (Pin 2): Differential Input. DC coupled (polarity is

irrelevant).

IN2 (Pin 3): Differential Input. DC coupled (polarity is

irrelevant).

_OUT(Pin5):OutputVoltage. Pin5ishighimpedance. The

RMS averaging is accomplished with a single shunt ca-

pacitor from Pin 5 to OUT RTN. The transfer function is

given by:

ENABLE (Pin 8): An Active-Low Enable Input. LTC1968 is

debiased if open circuited or driven to V⁺. For normal

operation, pull to GND.

⎡

⎣

⎤

OUT

– OUT RTN = Average IN2 –IN1

(

)

(

)

⎥

⎦

⎢

W U U

APPLICATIO S I FOR ATIO

RMS-TO-DC CONVERSION

Alternatives to RMS

Other ways to quantify dynamic waveforms include peak

detection and average rectification. In both cases, an

average (DC) value results, but the value is only accurate

at the one chosen waveform type for which it is calibrated,

typically sine waves. The errors with average rectification

are shown in Table 1. Peak detection is worse in all cases

and is rarely used.

Definition of RMS

RMS amplitude is the consistent, fair and standard way to

measure and compare dynamic signals of all shapes and

sizes. Simply stated, the RMS amplitude is the heating

potential of a dynamic waveform. A 1V_RMSAC waveform

willgeneratethesameheatinaresistiveloadaswill1VDC.

Mathematically, RMS is the “Root of the Mean of the

Square”:

Table 1. Errors with Average Rectification vs True RMS

AVERAGE

RECTIFIED

WAVEFORM

Square Wave

Sine Wave

(V)

ERROR*

_RMS= V²

RMS

1.000

0.900

0.866

0.637

11%

*Calibrate for 0% Error

–3.8%

Triangle Wave

1V DC

–

SCR at 1/2 Power,

–29.3%

Θ = 90°

SCR at 1/4 Power,

Θ = 114°

1.000

0.536

–40.4%

SAME

HEAT

1V AC

RMS

The last two entries of Table 1 are chopped sine waves as

is commonly created with thyristors such as SCRs and

Triacs. Figure 2a shows a typical circuit and Figure 2b

shows the resulting load voltage, switch voltage and load

1V (AC + DC) RMS

1968 F01

Figure 1

1968f

1...4 5 678 9 10...28

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LTC1968IMS8#TR	Linear	获取价格	暂无描述
LTC1968IMS8#TRPBF	Linear	获取价格	LTC1968 - Precision Wide Bandwidth, RMS-to-DC Converter; Package: MSOP; Pins: 8; Temperatu
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