LTC1569-7 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC1569-7 Datasheet PDF : 12 Pages
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LTC1569-7
APPLICATIONS INFORMATION
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.
TYPICAL APPLICATIO S
Single 3V Operation, AC Coupled Input,
128kHz Cutoff Frequency
VIN
3V
3.48k
2k
0.1µF
1 IN+
OUT
2 IN–
V+
LTC1569-7
3 GND
RX
1µF
4 V–
DIV/CLK
8 VOUT
7 REXT = 10k
6
5
( )( ) 128kHz
fCUTOFF =
n=1
10k
REXT
n = 1, 4, 16 FOR PIN 5 AT
GROUND, OPEN, V+
3V
1µF
1569-7 TA02
Single 3V Supply Operation, DC Coupled,
32kHz Cutoff Frequency
3V
3.48k
2k
VIN 1 IN+
2 IN–
OUT 8 VOUT
V+ 7 REXT = 10k
LTC1569-7
3 GND
RX 6
1µF
4 V–
DIV/CLK 5
( )( ) 128kHz 10k
fCUTOFF =
n = 4 REXT
n = 1, 4, 16 FOR PIN 5 AT
GROUND, OPEN, V+
100pF
3V
1µF
1569-7 TA04
Single 3V, AC Coupled Input,
128kHz Cutoff Frequency
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
0
16µs
14µs
12µs
0 20k 40k 60k 80k 100k 120k 140k
80k 100k 120k 140k 160k 180k 200k 220k 240k 260k 280k 300k
FREQUENCY (Hz)
1569-7 TA02a
Single 5V Operation, 300kHz Cutoff Frequency,
DC Coupled Differential Inputs with Balanced Input Impedance
VIN+
5V
VIN–
IN
LT®1460-2.5
(SOT-23)
OUT
GND
1 IN+
2 IN–
OUT 8 VOUT
V+ 7 REXT = 4.1k
27k LTC1569-7
3 GND
RX 6
1µF
4 V–
DIV/CLK 5
( )( ) 128kHz 10k
fCUTOFF ~
n = 1 4.1k
n = 1, 4, 16 FOR PIN 5 AT
GROUND, OPEN, V+
5V
1µF
1569-7 TA03
10
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