Datasheet LTC1150 (Analog Devices) - 8

LTC1150
W U TYPICAL PERFOR A CE CHARACTERISTICS 0.1Hz to 1Hz Noise, V =
±
15V, TA = 25
°
C, fS = 1800Hz
300nVP-P 500nV 100s LTC1150 • TPC28 10s
U U PI DESCRIPTIO S 8-Pin Packages ISUPPLY (Pin 1):
Supply Current Programming. The sup- simplified interface requirements. The amplitude of the ply current can be programmed through Pin 1. When clock input signal needs to be greater than 2V and the Pin 1 is left open or tied to V+, the supply current defaults voltage level has to be within the supply voltage range. to 800µA. Tying a resistor between Pin 1 and Pin 4, the Duty cycle is not critical. The internal chopping frequency negative supply pin, will reduce the supply current. The is the external clock frequency divided by four. When supply current, as a function of the resistor value, is frequency of the external clock falls below 100Hz (internal shown in Typical Performance Characteristics. chopping at 25Hz), the internal oscillator takes over and the circuit chops at 550Hz.
–IN (Pin 2):
Inverting Input.
OUT (Pin 6):
Output.
+IN (Pin 3):
Noninverting Input.
V+ (Pin 7):
Positive Supply.
V– (Pin 4):
Negative Supply.
CLOCK OUT (Pin 8):
Clock Output. The signal coming out
EXT CLOCK IN (Pin 5):
Optional External Clock Input. The of this pin is at the internal oscillator frequency of about LTC1150 has an internal oscillator to control the circuit 2.2kHz (four times the chopping frequency) and has operation of the amplifier if Pin 5 is left open or biased at voltage levels at V any DC voltage in the supply voltage range. When an H = VS and VL = VS – 4.6. If the circuit is driven by an external clock, Pin 8 is pulled up to V external clock is desirable, it can be applied to Pin 5. The S. applied clock is AC-coupled to the internal circuitry to 1150fb 8