LTC1064-1

5

10641fa

operation both pins should be tied to one half supply

(Figure 2). Also Pin 8 and Pin 10, although they are not

internally connected should be tied to analog ground or

system ground. This improves the clock feedthrough

performance.

bypassed with a 0.1µF capacitor to an adequate analog

ground. Low noise, nonswitching power supplies are

recommended.

To avoid latchup when the power supplies

exhibit high turn-on transients, a 1N5817 Schottky diode

(Figure 1).

INV A, R(h, I) (Pins 7, 14): A very short connection

between Pin 14 and Pin 7 is recommended. This connec-

tion should be preferably done under the IC package. In a

PI FU CTIO S

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.

NC (Pins 8, 10): The “no connection” pins preferably

should be grounded.

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 5MHz.

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

For clock level shifting (see Figure 3).

Figure 1. Using Schottky Diodes to Protect

the IC from Power Supply Spikes

Figure 2. Single Supply Operation. If Fast Power Up

or Down Transients are Expected, Use a 1N5817

Schottky Diode Between Pin 4 and Pin 5.

for Single Supply Operation, V+ >6V.

Figure 4. Buffering the Filter Output. The Buffer Op Amp

Should Not Share the LTC1064-1 Power Lines.

LTC1064-1

1

2

3

4

5

6

7

14

13

12

11

10

9

8

0.1µF

0.1µF

0.1µF

0.1µF

–

+

POWER SOURCE

10k

10k

1064 F04

RECOMMENDED OP AMPS:

LT1022, LT318, LT1056

COMP2*

NC

NC

INV C

AGND

AGND

COMP1*

R(h, I)

INV A

LTC1064-1

1

2

3

4

5

6

7

14

13

12

11

10

9

8

1064 F03

0.1µF

5k

2.2k

5k

5k 1

µF

LEVEL

R(h, I)

COMP2*

NC

NC

INV C

AGND

AGND

COMP1*

INV A

LTC1064-1

1

2

3

4

5

6

7

14

13

12

11

10

9

8

1064 F01

0.1µF

0.1µF

1N5817

1N5817

R(h, I)

COMP2*

NC

NC

INV C

AGND

AGND

COMP1*

INV A

LTC1064-1

1

2

3

4

5

6

7

14

13

12

11

10

9

8

0V TO 10V

1064 F02

0.1µF

0.1µF

5k

5k

R(h, I)

COMP2*

NC

NC

INV C

AGND

AGND

COMP1*

INV A

TYPICAL APPLICATIO S

(Pin Numbers Refer to the 14-Pin Package)