Features
- Low Input Offset Voltage: 6µV, Max.
- Low Offset Drift: 0.05µV/°C, Max.
- Quiescent Current (Per Amplifier): 18µA, Typ.
- Single Supply Range: +1.65V to +6.0V
- Dual Supply Range: ±0.825V to ±3.0V
- Low Noise (0.01Hz to 10Hz): 1.0µVP-P, Typ.
- Rail-to-Rail Inputs and Output
- Input Bias Current: 180pA, Max.
- Operating Temperature Range: -40 °C to +125 °C
Description
The ISL28433 is a quad micropower, chopper stabilized operational amplifier that is optimized for single and dual supply operation from 1.65V to 6.0V and ± 0.825V to ± 3.0V. Their low supply current of 18µA and wide input range enable the ISL28433 to be an excellent general-purpose op amp for a wide range of applications. The ISL28433 is ideal for handheld devices that operate off 2 AA or single Li-ion batteries. The ISL28433 is available in 14 Ld TSSOP, 14 Ld SOIC and 14 Ld 3mm x 4mm TDFN packages. The device operates over the temperature range of -40 °C to +125 °C.
Parameters
| Attributes | Value |
|---|---|
| Channels (#) | 4 |
| Temp. Range (°C) | -40 to +125°C |
| Bandwidth (MHz) | 0.4 |
| IBIAS (nA) | 0.18 |
| IS per Amp (mA) | 0.018 |
| Offset Voltage (Max) (mV) | 0.006 |
| Slew Rate (V/µs) | 0.2 |
| Rail-to-Rail Input | Yes |
| Rail-to-Rail Output | Yes |
| Single Supply Voltage Range (V) | 1.8 - 6 |
| Gain Min | 1 |
| IOUT (A) | 0.017 |
| Noise VN (nV/√Hz) | 65 |
| AVOL (dB) | 174 |
| CMRR (dB) | 125 |
| PSRR (db) | 138 |
| Enable | No |
| VOUT (V) | 4.9 |
| VS (Min) (V) | 1.8 |
| VS (Max) (V) | 6 |
| Thermal Shutdown | No |
Applications
- Bidirectional Current Sense
- Temperature Measurement
- Medical Equipment
- Electronic Weigh Scales
- Precision/Strain Gauge Sensor
- Precision Regulation
- Low Ohmic Current Sense
- High Gain Analog Front Ends
Renesas Boards & Kits
Quad Micropower, Chopper-Stabilized, RRIO Op Amp Evaluation Board
The ISL28433SOICEVAL1Z evaluation board is designed to evaluate the performance of the ISL28433 chopper-stabilized op amp. The ISL28433 chopper-stabilized rail-to-rail quad op amp features a low 8μV maximum VOS over-temperature and a 0.1Hz 1/f noise corner frequency, enabling very high gain... Read More
Quad Micropower, Chopper-Stabilized, RRIO Op Amp Evaluation Board
The ISL28433TSSOPEVAL1Z evaluation board is designed to evaluate the performance of the ISL28433 chopper-stabilized op amp. The ISL28433 chopper-stabilized, rail-to-rail, quad op amp features a low 8μV maximum VOS over-temperature and a 0.1Hz 1/f noise corner frequency, enabling very-high gain... Read More
Knowledge Base
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Do chopper amplifiers have any negative characteristics that users should know about?
... small in the ISL28XXX series of amplifiers, but it is present. Chopper-stabilized amplifiers are usually used for low frequency applications, DC measurement being most common, so this clock residue which is at much higher frequency can easily be filtered out. This FAQ applies to ISL28133, ISL28134, ISL28233, and ISL28433.
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What dictates the noise performance of the chopper amplifier?
... uses much less current than the ISL28134. Noise in a transistor is reduced proportional to the square of the current value. The noise peaking at about 8KHz is due to the summing behavior of the two amplifier paths inside the architecture. This FAQ applies to ISL28133, ISL28134, ISL28233, and ISL28433.
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Can you explain what a chopper-stabilized amplifier is and what advantages it has over a regular operational amplifier?
... amplifier input stage is modulated to a higher frequency (the chopping frequency) where the filter stage filters it out. Therefore the op amp has very low offset error and low offset drift. Its 1/f noise is also greatly reduced. This FAQ applies to ISL28133, ISL28134, ISL28233, and ISL28433.
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