LMC8101BPX datasheet(7/15 Pages) NSC

Part #	LMC8101BPX

Description	Rail-to-Rail Input and Output, 2.7V Op Amp in micro SMD package with Shutdown

Download	15 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

Logo

7 / 15 page

Application Notes (Continued)

Conversion Boards:

In order to ease the evaluation of tiny packages such as the

micro SMD, there is a conversion board (LMC8101CONV)

available to board designers. This board converts a micro

SMD device into an 8 pin DIP package (see

Figure 2, Con-

version Board Pin out diagram) for easier handling and

evaluation. This board can be ordered from National Semi-

conductor by contacting http://www.national.com .

Increased Output Current:

Compared to the LMC7101, the LMC8101 has an improved

output stage capable of up to three times larger output

sourcing and sinking current. This improvement would allow

a larger output voltage swing range compared to the

LMC7101 when connected to relatively heavy loads. For

lower supply voltages this is an added benefit since it in-

creases the output swing range. For example, the LMC8101

can typically swing 2.5Vpp with 2mA sourcing and sinking

output current (Vs = 2.7V) whereas the LMC7101 output

swing would be limited to 1.9Vpp under the same conditions.

Also, compared to the LMC7101 in the SOT23 package, the

LMC8101 can dissipate more power because both the

MSOP and the micro SMD packages have 40% better heat

dissipation capability.

Lower 1/f noise:

The dominant input referred noise term for the LMC8101 is

the input noise voltage. Input noise current for this device is

of no practical significance unless the equivalent resistance

it looks into is 5M

Ω or higher.

The LMC8101’s low frequency noise is significantly lower

than that of the LMC7101. For example, at 10Hz, the input

referred spot noise voltage density is 85 nV

as com-

pared to about 200nV

for the LMC7101. Over a fre-

quency range of 0.1Hz to 100Hz, the total noise of the

LMC8101 will be approximately 60% less than that of the

LMC7101.

Lower THD:

When connected to heavier loads, the LMC8101 has lower

THD compared to the LMC7101. For example, with 5V sup-

ply at 10KHz and 2Vpp swing (Av = −2), the LMC8101 THD

(0.2%)is60% less than the LMC7101’s. The LMC8101 THD

can be kept below 0.1% with 3Vpp at the output for up to

10KHz (refer to the Typical Characteristics Plots).

Improving the Cap load drive capability:

This can be accomplished in several ways:

•

Output resistive loading increase:

The Phase Margin increases with increasing load (refer to

the Typical Characteristics Plots). When driving capacitive

loads, stability can generally be improved by allowing some

output current to flow through a load. For example, the cap

load drive capability can be increased from 8200pF to

16000pF if the output load is increased from 5K

Ω to 600Ω

(Av = +10, 25% overshoot limit, 10V supply).

•

Isolation resistor between output and cap load:

This resistor will isolate the feedback path (where excessive

phase shift due to output capacitance can cause instability)

from the capacitive load. With a 10V supply, a 100

Ω isolation

resistor allows unlimited capacitive load without oscillation

compared to only 300pF without this resistor (Av = +1).

•

Higher supply voltage:

Operating the LMC8101 at higher supply voltages allows

higher cap load tolerance. At 10V, the LMC8101’s low supply

voltage cap load limit of 300pF improves to about 600pF (Av

= +1).

•

Closed loop gain increase:

As with all Op Amps, the capacitive load tolerance of the

LMC8101 increases with increasing closed loop gain. In ap-

plications where the load is mostly capacitive and the resis-

tive loading is light, stability increases when the LMC8101 is

operated at a closed loop gain larger than +1.

DS101240-89

FIGURE 2. micro SMD Conversion Board pin-out

www.national.com

7

Similar Part No. - LMC8101BPX

Manufacturer	Part #	Datasheet	Description
National Semiconductor ...	LMC8101BPX	755Kb / 19P	Rail-to-Rail Input and Output, 2.7V Op Amp in micro SMD package with Shutdown

More results

Similar Description - LMC8101BPX

Manufacturer	Part #	Datasheet	Description
National Semiconductor ...	LMC8101TP	755Kb / 19P	Rail-to-Rail Input and Output, 2.7V Op Amp in micro SMD package with Shutdown
Texas Instruments	LMC8101	1Mb / 26P	[Old version datasheet] Rail-to-Rail Input and Output, 2.7V Op Amp in DSBGA Package With Shutdown
Linear Technology	LT6010	302Kb / 16P	Rail-to-Rail Output Precision Op Amp with Shutdown
Linear Technology	LT6010	602Kb / 16P	Rail-to-Rail Output Precision Op Amp with Shutdown
Analog Devices	LTC6228	2Mb / 26P	Low Distortion Rail-to-Rail Output Op Amp with Shutdown
Intersil Corporation	EL5211A	204Kb / 12P	60MHz Rail-to-Rail Input-Output Op Amp
Linear Technology	LT1797	195Kb / 12P	10MHz, Rail-to-Rail Input and Output Op Amp in SOT-23
Linear Technology	LT1797	199Kb / 14P	10MHz, Rail-to-Rail Input and Output Op Amp in SOT-23
Intersil Corporation	EL5412	199Kb / 8P	40MHz Rail-to-Rail Input-Output Op Amp
Intersil Corporation	EL5211A	203Kb / 12P	60MHz Rail-to-Rail Input-Output Op Amp

More results

LMC8101BPX Datasheet(PDF) 7 Page - National Semiconductor (TI)

LMC8101BPX Datasheet(HTML) 7 Page - National Semiconductor (TI)

Similar Part No. - LMC8101BPX

Similar Description - LMC8101BPX

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Datasheet Download

Link URL