PowerWise Precision Reference Selection | Texas Instruments
Decode LM4128 voltage and accuracy options and budget the reference’s active and shutdown time.
Choosing the reference behind the ADC full scale
LM4128 parts in this group supply a fixed reference voltage. A 2.5 V reference and a 4.096 V reference produce different volts per ADC code even with the same converter and input divider.
Check initial accuracy and temperature coefficient for the selected grade. Initial error changes the room-temperature gain, while drift accumulates as the reference moves away from its calibration temperature.
The enable input permits duty cycling. Include the time needed for the reference and its output capacitance to settle before using the first conversion after wake-up. Use LM4128-Q1 ordering information for automotive builds.
Target Applications
- Duty-cycled precision measurement
Compare PowerWise® Variants
Comparison of 10 selected variants from Texas Instruments
| Parameter | LM4128DQ1MFX2.0/NOPB | LM4128DQ1MFX3.0/NOPB | LM4128DQ1MF4.1/NOPB | LM4128DQ1MFX4.1/NOPB | LM4128AMFX-4.1 | LM4128AMFX-2.5/NOPB | LM4128AMFX-3.3 | LM4128AMFX-3.0/NOPB | LM4128AMFX-3.0 | LM4128AMFX-2.5 |
|---|---|---|---|---|---|---|---|---|---|---|
| Package / Case | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 | SC-74A, SOT-753 |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) |
| Current Supply | 100µA | 100µA | 100µA | 100µA | 100µA | 100µA | 100µA | 100µA | 100µA | 100µA |
| Input Voltage | 2.448V ~ 5.5V | 3.4V ~ 5.5V | 4.496V ~ 5.5V | 4.496V ~ 5.5V | 4.496V ~ 5.5V | 2.9V ~ 5.5V | 3.7V ~ 5.5V | 3.4V ~ 5.5V | 3.4V ~ 5.5V | 2.9V ~ 5.5V |
| Lifecycle Status | Active | Active | Active | Active | Obsolete | Active | Obsolete | Active | Obsolete | Obsolete |
| Noise 0 1 Hz to 10 Hz | 190µVp-p | 285µVp-p | 350µVp-p | 350µVp-p | 350µVp-p | 275µVp-p | 310µVp-p | 285µVp-p | 285µVp-p | 275µVp-p |
| Output Current | 20 mA | 20 mA | 20 mA | 20 mA | 20 mA | 20 mA | 20 mA | 20 mA | 20 mA | 20 mA |
| Output Type | Fixed | Fixed | Fixed | Fixed | Fixed | Fixed | Fixed | Fixed | Fixed | Fixed |
| Package | SOT-23-5 | SOT-23 (DBV)-5 | SOT-23 (DBV)-5 | SOT-23 (DBV)-5 | SOT-23-5 | SOT-23-5 | SC-74A,SOT-753 | SOT-23 (DBV)-5 | SC-74A, SOT-753 | SC-74A,SOT-753 |
| Reference Type | Series | Series | Series | Series | Series | Series | Series | Series | Series | Series |
| Supplier Device Package | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 | SOT-23-5 |
| Temperature Coefficient | 100ppm/°C | 100ppm/°C | 100ppm/°C | 100ppm/°C | 75ppm/°C | 75ppm/°C | 75ppm/°C | 75ppm/°C | 75ppm/°C | 75ppm/°C |
| Tolerance | ±1% | ±1% | ±1% | ±1% | ±0.1% | ±0.1% | ±0.1% | ±0.1% | ±0.1% | ±0.1% |
| Voltage Output Min Fixed | 2.048V | 3V | 4.096V | 4.096V | 4.096V | 2.5V | 3.3V | 3V | 3V | 2.5V |
| Request Quote | Request Quote | Request Quote | Request Quote | Request Quote | Request Quote | Request Quote | Request Quote | Request Quote | Request Quote |
Base Numbers
MPN counts describe each base number’s catalog coverage; they are not a series total.
| Base Number | Description | Variants | Action |
|---|---|---|---|
| ADC12C | ADC12C variants from Texas Instruments | 5 MPNs | View Details |
| LM4128AMFX | LM4128AMFX variants from Texas Instruments | 4 MPNs | View Details |
| LM4128DQ | LM4128DQ variants from Texas Instruments | 8 MPNs | View Details |
Technical Specifications
Choosing the reference behind the ADC full scale
PowerWise® Series Applications
Frequently Asked Questions
Common technical questions about the PowerWise® series.