SLOA332A July   2023  – September 2024 LMV821-N , LMV831 , OPA2991 , OPA345 , OPA376 , OPA376-Q1 , OPA377 , OPA377-Q1 , OPA4991 , OPA991 , TL074 , TLV376 , TLV9001 , TLV9002 , TS321

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Slew Rate Definition
    1. 1.1 Virtual Ground and Slew Rate
  5. 2 Bipolar Op Amp Slew Rate Example
  6. 3 CMOS Op Amp Slew Rate Example
    1. 3.1 Slew Boost Example 1
    2. 3.2 Slew Boost Example 2
    3. 3.3 Slew Boost Summary
  7. 4 Four Methods to Determine Boost or No Boost Using the Data Sheet
    1. 4.1 Method 1: Compare Slew Rate Versus Gain Bandwidth
    2. 4.2 Method 2: Compare Quiescent Current Versus Similar SR Devices
    3. 4.3 Method 3: Evaluate Large Signal Response
    4. 4.4 Method 4: Evaluate Small Signal Response
  8. 5 Slew Rate Dependencies on Circuit Signal Levels and Op Amp Gain Set by Feedback Network
  9. 6 How Much Output Slew Rate is Needed to Support a Sine Wave or Other Non-step Inputs
  10. 7 Stability Also Plays a Role in Observed Slew Rate
  11. 8 Summary
  12. 9 References
  13. 10Revision History

4.1 Method 1: Compare Slew Rate Versus Gain Bandwidth

The first method is to compare the slew rate (SR) in V/µs to the gain bandwidth product (GBWP) in MHz. If the SR > GBWP, then slew boost is likely integrated in the device. If SR < GBWP, then boost is not as likely to be integrated into the device. TLV9001 has SR > GBWP, (2V/µs > 1MHz), which indicates that boost is likely integrated into the device. LMV831 has SR < GBWP, (2V/µs < 3.3MHz), which indicates that boost is not likely to be integrated in the device.

Table 4-1 Device Parameters Used in Method 1 to Determine Presence of Boost
BoostNo Boost
Device TLV9001Device LMV831
Slew rate 2V/µsSlew rate 2V/µs
Bandwidth 1MHzBandwidth 3.3MHz