LTC1064 datasheet(6/20 Pages) LINER

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LTC1064

1064fb

V–

CLK

50/100

AGND

V+

ANALOG

GROUND

PLANE

NOTE: PINS 5, 8, 20, IF NOT USED, SHOULD BE CONNECTED TO PIN 6

CLOCK INPUT

V+ = 15V, TRIP VOLTAGE = 7V

V+ = 10V, TRIP VOLTAGE = 6.4V

V+ = 5V, TRIP VOLTAGE = 3V

TO DIGITAL

GROUND

V+

LTC1064

0.1

µF

1064 F01

µF

V+/2

PIN FUNCTIONS

AGND (Pin 6): Analog Ground. When the LTC1064 oper-

ates with dual supplies, Pin 6 should be tied to system

ground. When the LTC1064 operates with a single positive

supply, the analog ground pin should be tied to 1/2 supply

and it should be bypassed with a 1

µF solid tantalum in

parallel with a 0.1

µF ceramic capacitor, Figure 1. The

positive input of all the internal op amps, as well as the

common reference of all the internal switches, are inter-

nally tied to the analog ground pin. Because of this, a very

“clean” ground is recommended.

50/100 (Pin 17): By tying Pin 17 to V +, all filter sections

operate with a clock-to-center frequency ratio internally

set at 50:1. When Pin 17 is at mid-supplies, sections B and

C operate with (fCLK/fO) = 50:1 and sections A and D

operate at 100:1. When Pin 17 is shorted to the negative

supply pin, all filter sections operate with (fCLK/fO) =

100:1.

V +, V – (Pins 7, 19): Power Supplies. They should be

bypassed with a 0.1

µF ceramic capacitor. Low noise,

nonswitching power supplies are recommended. The de-

vice operates with a single 5V supply and with dual

supplies. The absolute maximum operating power supply

voltage is

±8V.

CLK (Pin 18): Clock. For

±5V supplies the logic threshold

level is 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 tem-

perature 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

supplies and above, the maximum clock frequency is

7MHz.

Figure 1. Single Supply Operation

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