LTC1061CS datasheet(6/16 Pages) LINER

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LTC1061

PI DESCRIPTIO A D APPLICATIO HI TS

Figure 1. the 6th Order LP Butterworth Filter of Figure 5

Operating with a Single 5V Supply.

VOUT

VIN

0.1

µF

LTC1061 F01

LTC1061

T2L CLOCK

fCLK < 1MHz

µF

2.49k

CIN

Clock Feedthrough

This is defined as the amplitude of the clock frequency

appearing at the output pins of the device, Figure 2. Clock

feedthrough is measured with all three sides of the LTC1061

connected as filters. The clock feedthrough mainly de-

pends on the magnitude of the power supplies and it is

independent from the input clock levels, clock frequency

and modes of operation.

The Table 2 illustrates the typical clock feedthrough num-

bers for various power supplies.

50/100/Hold (Pin 7)

By tying Pin 7 to V+, the filter operates with a clock-to-

center frequency internally set at 50:1. When Pin 7 is at

mid-supplies, the filter operates with a 100:1 clock-to-

center frequency ratio. Table 1 shows the allowable varia-

tion of the potential at Pin 7 when the 100:1 mode is

sought.

When Pin 7 is shorted to the negative supply pin, the filter

operation is stopped and the bandpass and lowpass

output act as a sample-and-hold circuit holding the last

sample of the input voltage. The hold step is around 2mV

and the droop rate is 150

µV/sec.

Table 1

TOTAL POWER SUPPLY

VOLTAGE RANGE OF PIN 7

(V)

FOR 100:1 OPERATION (V)

2.5

± 0.5

±1

7.5

±1.5

Figure 2. Typical Clock Feedthrogh of the LTC1061 Operating

with

±5V Supplies. Top Trace is the Input Clock Swinging 0V to

5V and Bottom Trace is One of the Lowpass Outputs with Zero or

DC Input Signals.

A = 2V/DIV

B = 10mV/DIV

HORIZONTAL = 10

µs/DIV

POWER SUPPLY (V)

CLOCK FEEDTHROUGH (VRMS)

±2.5

0.2

±5

0.4

±8

0.8

Table 2

Definition of Filter Functions

Refer to LTC1060 data sheet.

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