LTC1064-2

7

10642fa

PI FU CTIO S

NC (Pins 1, 6, 8 and 13): The “no connection” pins should

be preferably grounded. These pins are not internally

connected.

18k resistor tied to the inverting input of an op amp. Pin

2 is protected against static discharge. The device’s

output, Pin 9, is the output of an op amp which can

typically source/sink 3mA/1mA. Although the internal op

amps are unity gain stable, driving long coax cables is not

recommended.

When testing the device for noise and distortion, the

output, Pin 9, should be buffered. (Figure 1)

The op amp

power supply wire (or trace) should be connected

directly to the power source. To eliminate switching

transients from filter output, buffer filter output with a

third order lowpass (Figure 5).

AGND (Pins 3, 5): For dual supply operation these pins

should be connected to a ground plane. For single supply

operation both pins should be tied to one half supply,

(Figure 3).

capacitor to an adequate AGND. Low noise, nonswitching

power supplies are recommended.

To avoid latchup when

the power supplies exhibit high turn-on transients, a

Pin 7 and Pin 14 is recommended. This connection should

be preferably done under the IC package. In a breadboard

use a one inch, or less, shielded coaxial cable: the shield

should be grounded. In a PC board, use a one inch trace or

less; surround the trace by a ground plane.

50/100 (Pin 10): The DC level at this pin determines the

ratio of clock frequency to the –3dB frequency of the filter.

(Figure 1). See Tables 1 through 7 for typical gain and delay

responses for the two ratios.

1.4V. For ±8V and 0V to 5V supplies the logic threshold

levels are 2.2V and 3V respectively. The logic threshold

levels vary ±100mV over the full military temperature

range. The recommended duty cycle of the input clock is

50% although for clock frequencies below 500kHz the

clock “on” time can be as low as 200ns. The maximum

clock frequency for ±5V supplies is 4MHz. For ±7V sup-

plies and above, the maximum clock frequency is 7MHz.

Do not allow the clock levels to exceed the power supplies.

For single supply operation ≥6V use level shifting at Pin 11

(Pin Numbers Refer to the 14-Pin Package)