LTC1069-1
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PIN FUNCTIONS
NC (Pins 3, 6): No Connection. Pins 3 and 6 are not
connected to any internal circuity; they should be prefer-
ably tied to ground.
fall is 1µs. The clocksignal should be routed from the right
side of the IC package to avoid coupling into any input or
output analog signal path. A 1k resistor between the clock
source and the clock input pin (5) will slow down the rise
and fall times of the clock to further reduce charge cou-
pling, Figure 1.
VIN (Pin 4): Filter Input Pin. The filter input pin is internally
connected to the inverting input of an op amp through a
43k resistor.
Table 1. Clock Source High and Low Thresholds
CLK (Pin 5): Clock Input Pin. Any TTL or CMOS clock
source with a square wave output and 50% duty cycle
(±10%) is an adequate clock source for the device. The
power supply for the clock source should not necessarily
be the filter’s power supply. The analog ground of the filter
should be connected to clock’s ground at a single point
only. Table 1 shows the clock’s low and high level thresh-
old value for a dual or a single supply operation. A pulse
generator can be used as a clock source provided the high
level ON time is greater than 0.42µs (VS = ±5V). Sine
waves less than 100kHz are not recommended for clock
signal because excessive slow clock rise or fall times
generate internal clock jitter. The maximum clock rise or
POWER SUPPLY
HIGH LEVEL
1.5V
LOW LEVEL
0.5V
Dual Supply = ±5V
Single Supply = 10V
Single Supply = 5V
Single Supply = 3.3V
6.5V
1.5V
1.2V
5.5V
0.5V
0.5V
VOUT (Pin 8): Filter Output Pin. Pin 8 is the output of the
filter and it can source or sink 1mA. Driving coaxial cables
or resistive loads less than 20k will degrade the total
harmonic distortion of the filter. When evaluating the
device’s dynamic range, a buffer is required to isolate the
filter’s output from coax cables and instruments.
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APPLICATIONS INFORMATION
Temperature Behavior
especially at ±5V supply, has a passband behavior which
is nearly temperature independent.
The power supply current of the LTC1069-1 has a positive
temperature coefficient. The GBW product of its internal
op amps is nearly constant and the speed of the device
doesnotdegradeathightemperatures. Figures3a, 3band
3c show the behavior of the maximum passband of the
device for various supplies and temperatures. The filter,
Clock Feedthrough
The clock feedthrough is defined as the RMS value of the
clock frequency and its harmonics that are present at the
filter’s output pin (8). The clock feedthrough is tested with
2.0
2.0
1.5
2.0
1.5
V
CLK
V
= ±5V
S
V
f
IN
= 3.3V
V
f
= 5V
S
S
1.5
1.0
f
= 1.5MHz
= 750kHz
= 1MHz
CLK
= 0.5V
RMS
CLK
= 1.2V
RMS
= 2V
RMS
IN
V
V
IN
T
= 25°C
A
1.0
T = 85°C
A
1.0
T
= 25°C
A
T
= 85°C
0.5
T
= 85°C
A
A
0.5
0.5
T
= –40°C
A
0
T
= 25°C
A
0
0
T
= –40°C
A
–0.5
–1.0
–1.5
–2.0
–0.5
–1.0
–1.5
–2.0
–0.5
–1.0
–1.5
–2.0
T
= –40°C
A
3
5
7
9
11
15
1
13
1.5
2.5 3.5 4.5 5.5
FREQUENCY (kHz)
7.5
0.5
6.5
1.5 2.5 3.5 4.5 5.5
7.5 8.5 9.5 10.5
6.5
0.5
FREQUENCY (kHz)
FREQUENCY (kHz)
1069-1 F03c
1069-1 F03a
1069-1 F03b
Figure 3a
Figure 3b
Figure 3c
6
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