TP2111 datasheet(8/18 Pages) 3PEAK

8 / 18 page

TP2111/TP2111N/TP2112/TP2114

Nanopower 300nA, 1.8V, Rail-to-Rail Input/Output Op-amps

REV1.0

www.3peakic.com

Typical Performance Characteristics

Closed-Loop Output Impedance vs. Frequency

100

10k

100k

100

10k

FREQUENCY (Hz)

0.1Hz to 10Hz Time Domain Output Voltage Noise

-10

-8

-6

-4

-2

-6

-4

-2

TIME(Seconds)

Pin Functions

–IN: Inverting Input of the Amplifier. Voltage range of

this pin can go from V

– – 0.3V to V+ + 0.3V.

+IN: Non-Inverting Input of Amplifier. This pin has the

same voltage range as

–IN.

V+ or +VS: Positive Power Supply. Typically the voltage

is from 1.8V to 5.5V. Split supplies are possible as long

as the voltage between V+ and V

– is between 1.8V and

5.5V. A

bypass capacitor of 0.1μF as close to the part as

possible should be used between power supply pins or

between supply pins and ground.

N/C: No Connection.

–

VS: Negative Power Supply. It is normally

tied to ground. It can also be tied to a voltage other

than ground as long as the voltage between V

+ and

–

is from 1.8V to 5.5V. If it is not connected to

ground, bypass it with a capacitor

of 0.1μF as close

to the part as possible.

SHDN: Active Low Shutdown. Shutdown threshold

is 1.0V above negative supply rail. If unconnected,

the amplifier is automatically enabled.

OUT: Amplifier Output. The voltage range extends

to within milli-volts of each supply rail.

Operation

The TP211x family input signal range extends beyond

the negative and positive power supplies. The output

can even extend all the way to the negative supply. The

input stage is comprised of two CMOS differential

amplifiers, a PMOS stage and NMOS stage that are

active over different ranges of common mode input

voltage. The Class-AB control buffer and output bias

stage uses a proprietary compensation technique to

take full advantage of the process technology to drive

very high capacitive loads. This is evident from the

transient over shoot measurement plots in the Typical

Performance Characteristics.

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