10

LTC1569-7

Single 3V Operation, AC Coupled Input,

128kHz Cutoff Frequency

18

27

36

45

VOUT

VIN

1

µF

3V

REXT = 10k

1

µF

0.1

µF

2k

3.48k

3V

1569-7 TA02

LTC1569-7

IN+

IN–

GND

V–

OUT

V+

RX

DIV/CLK

fCUTOFF =

n = 1, 4, 16 FOR PIN 5 AT

GROUND, OPEN, V+

128kHz

n = 1

() 10k

REXT

()

18

27

36

45

VOUT

VIN

1

µF

3V

REXT = 10k

100pF

1

µF

2k

3.48k

3V

1569-7 TA04

LTC1569-7

IN+

IN–

GND

V–

OUT

V+

RX

DIV/CLK

fCUTOFF =

n = 1, 4, 16 FOR PIN 5 AT

GROUND, OPEN, V+

128kHz

n = 4

() 10k

REXT

()

Single 3V Supply Operation, DC Coupled,

32kHz Cutoff Frequency

Single 5V Operation, 300kHz Cutoff Frequency,

DC Coupled Differential Inputs with Balanced Input Impedance

18

27

36

45

VOUT

VIN

+

VIN

–

1

µF

5V

REXT = 4.1k

1

µF

27k

5V

1569-7 TA03

IN

GND

OUT

LT

®1460-2.5

(SOT-23)

LTC1569-7

fCUTOFF ~

n = 1, 4, 16 FOR PIN 5 AT

GROUND, OPEN, V+

128kHz

n = 1

() 10k

4.1k

()

IN+

IN–

GND

V–

OUT

V+

RX

DIV/CLK

TYPICAL APPLICATIO S

Single 3V, AC Coupled Input,

128kHz Cutoff Frequency

FREQUENCY (Hz)

0

300k

80k 100k

160k 180k

240k 260k

120k 140k

200k 220k

280k

1569-7 TA02a

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

16

µs

14

µs

12

µs

140k

0

20k

80k 100k

40k

60k

120k

every clock period. Therefore, the sampling frequency is

twice the clock frequency and 64 times the filter cutoff

frequency. Input signals with frequencies near 2 • fCLK

± fCUTOFF will be aliased to the passband of the filter and

appear at the output unattenuated.

Power Supply Current

The power supply current depends on the operating mode.

When the LTC1569-7 is in the divide-by-1 mode, or when

clocked externally, the supply current is reduced by 50%

for supply voltages below 4V. For the divide-by-4 and

divide-by-16 modes, the supply current is reduced by

60% relative to the current when clocked externally,

independent of the power supply voltage. Power supply

current versus cutoff frequency for various operating

modes is shown in the “Typical Performance Characteris-

tics” section.

APPLICATIONS INFORMATION