LTC1069-6C View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC1069-6C Datasheet PDF : 10 Pages
| |||
APPLICATIONS INFORMATION
Temperature Behavior
The power supply current of the LTC1069-6 has a positive
temperature coefficient. The GBW product of its internal
op amps is nearly constant and the speed of the device
does not degrade at high temperatures. Figures 4a, 4b
and 4c show the behavior of the passband of the device
for various supplies and temperatures. The filter has a
passband behavior which is temperature independent.
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
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 2. Clock Feedthrough
VS
CLOCK FEEDTHROUGH
3.3V
100μVRMS
5V
170μVRMS
10V
350μVRMS
Any parasitic switching transients during the rising and
falling edges of the incoming clock are not part of the
clock feedthrough specifications. Switching transients
have frequency 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).
LTC1069-6
2
VS = SINGLE 3V
VIN = 0.5VRMS
1
85°C
0
– 40°C
–1
fCLK = 500kHz
fCUTOFF = 10kHz
–2
1 3 5 7 9 11 13 15 17 19 21
FREQUENCY (kHz)
1069-6 F04a
Figure 4a
2
VS = SINGLE 5V
VIN = 1VRMS
1
85°C
0
– 40°C
–1
fCLK = 750kHz
fCUTOFF = 15kHz
–2
1 3 5 7 9 11 13 15 17 19 21
FREQUENCY (kHz)
1069-6 F04a
Figure 4b
2
VS = ±5V
VIN = 1.5VRMS
1
85°C
0
– 40°C
–1
fCLK = 1MHz
fCUTOFF = 20kHz
–2
1 4 7 10 13 16 19 22 25 28 31
FREQUENCY (kHz)
1069-6 F04c
Figure 4c
10696fa
7
Share Link: 