Datasheet > LTC1069-6

LTC1069-6

更新时间： 2022-11-25 12:22:29

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
8页	230K
描述
Single Supply, Very Low Power, Elliptic Lowpass Filter

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LTC1069-6 数据手册

LTC1069-6

W U U

APPLICATIONS INFORMATION

quency contents much higher than the applied clock; their

amplitude strongly depends on scope probing techniques

as well as grounding and power supply bypassing. The

clock feedthrough can be reduced by adding a single RC

lowpass filter at the Output (Pin 8).

= SINGLE 5V

= 1V

RMS

85°C

–40°C

Wideband Noise

= 750kHz

CLK

–1

–2

= 15kHz

CUTOFF

The wideband noise of the filter is the total RMS value of

the device’s noise spectral density and determines the

operating signal-to-noise ratio. The frequency contents of

the wideband noise lie within the filter’s passband. The

wideband noise cannot be reduced by adding post filter-

ing. The total wideband noise is nearly independent of the

clock frequency and depends slightly on the power supply

voltage (see Table 3). The clock feedthrough specifica-

tions are not part of the wideband noise.

11 13 15 17 19 21

FREQUENCY (kHz)

1069-6 F04a

Figure 4b

= ±5V

= 1.5V

RMS

Table 3. Wideband Noise

85°C

WIDEBAND NOISE

–40°C

3.3V

118µV

123µV

127µV

RMS

= 1MHz

= 20kHz

CLK

CUTOFF

–1

–2

±5V

10 13 16 19 22 25 28 31

FREQUENCY (kHz)

1069-6 F04c

Aliasing

Aliasing is an inherent phenomenon of sampled data

systemsandoccursforinputfrequenciesapproachingthe

sampling frequency. The internal sampling frequency of

the LTC1069-6 is 100 times its cutoff frequency. For

instance, if a 98.5kHz, 100mV_RMSsignal is applied at the

input of an LTC1069-6 operating with a 50kHz clock, a

1.5kHz, 484µV_RMSalias signal will appear at the filter

output. Table 4 shows details.

Figure 4c

Clock Feedthrough

The clock feedthrough is defined as the RMS value of the

clock frequency and its harmonics that are present at the

filter’sOutput(Pin8). Theclockfeedthroughistestedwith

the Input (Pin 4) shorted to AGND (Pin 1) and depends on

PC board layout and on the value of the power supplies.

With proper layout techniques the values of the clock

feedthrough are shown in Table 2.

Table 4. Aliasing (f_CLK= 50kHz)

INPUT FREQUENCY

OUTPUT LEVEL

(Relative to Input)

(dB)

OUTPUT FREQUENCY

(Aliased Frequency)

(kHz)

(V = 1V

)

RMS

(kHz)

Table 2. Clock Feedthrough

/f = 50:1, f

= 1kHz

CLK

CUTOFF

CLOCK FEEDTHROUGH

96 (or 104)

97 (or 103)

–78.3

–70.4

–80.6

–46.3

–2.8

4.0

3.0

2.0

1.5

1.0

0.5

3.3V

100µV

170µV

350µV

RMS

98 (or 102)

10V

98.5 (or 101.5)

99 (or 101)

Any parasitic switching transients during the rising and

fallingedgesoftheincomingclockarenotpartoftheclock

feedthroughspecifications. Switchingtransientshavefre-

99.5 (or 100.5)

–1.38

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

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