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LTC1150MJ8
(Rev.:RevB)

±15V Zero-Drift Operational Amplifier with Internal Capacitors

Linear Technology 

LTC1150

TYPICAL PERFOR A CE CHARACTERISTICS

0.1Hz to 1Hz Noise, V = ±15V, TA = 25°C, fS = 1800Hz

300nVP-P

500nV

10s

100s

LTC1150 • TPC28

PI DESCRIPTIO S 8-Pin Packages

ISUPPLY (Pin 1): Supply Current Programming. The sup-

ply current can be programmed through Pin 1. When

Pin 1 is left open or tied to V+, the supply current defaults

to 800µA. Tying a resistor between Pin 1 and Pin 4, the

negative supply pin, will reduce the supply current. The

supply current, as a function of the resistor value, is

shown in Typical Performance Characteristics.

–IN (Pin 2): Inverting Input.

+IN (Pin 3): Noninverting Input.

V– (Pin 4): Negative Supply.

EXT CLOCK IN (Pin 5): Optional External Clock Input. The

LTC1150 has an internal oscillator to control the circuit

operation of the amplifier if Pin 5 is left open or biased at

any DC voltage in the supply voltage range. When an

external clock is desirable, it can be applied to Pin 5. The

applied clock is AC-coupled to the internal circuitry to

simplified interface requirements. The amplitude of the

clock input signal needs to be greater than 2V and the

voltage level has to be within the supply voltage range.

Duty cycle is not critical. The internal chopping frequency

is the external clock frequency divided by four. When

frequency of the external clock falls below 100Hz (internal

chopping at 25Hz), the internal oscillator takes over and

the circuit chops at 550Hz.

OUT (Pin 6): Output.

V+ (Pin 7): Positive Supply.

CLOCK OUT (Pin 8): Clock Output. The signal coming out

of this pin is at the internal oscillator frequency of about

2.2kHz (four times the chopping frequency) and has

voltage levels at VH = VS and VL = VS – 4.6. If the circuit is

driven by an external clock, Pin 8 is pulled up to VS.

1150fb

8

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