Electronic Components Datasheet Search |
|
LMC8101BPX Datasheet(PDF) 7 Page - National Semiconductor (TI) |
|
|
LMC8101BPX Datasheet(HTML) 7 Page - National Semiconductor (TI) |
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 |
|
Similar Description - LMC8101BPX |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |