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The LMP7721 is the industry's lowest specified input bias current precision amplifier. The ultra-low input bias current is 3 fA, with a specified limit of +20 fA at 25°C and +900 fA at 85°C. This is achieved with the latest patent-pending technology of input bias current cancellation amplifier circuitry. This technology also maintains the ultra-low input bias current over the entire input common-mode voltage range of the amplifier.
This blog will introduce LMP7721 systematically from its features, pinout to its specifications, applications, also including LMP7721 datasheet and so much more.
- Maximum at 25°C +20 fA
- Maximum at 85°C +900 fA
The following figure is the diagram of LMP7721 pinout.
LMP7721 Pinout
The following figure shows the functional block diagram of LMP7721.
LMP7721 Functional Block Diagram
The following are the circuit diagrams of LMP7721.
Guarding the Noninverting Configuration
A CMOS input stage with ultra-low input bias current, negligible input current noise, and low input voltage noise allows the LMP7721 to provide high fidelity amplification. In addition, the LMP7721 has a 17 MHz gain bandwidth product, which enables high gain at wide bandwidth. A rail-to-rail output swing at 5.5-V power supply allows detection and amplification of a wide range of input currents. These properties make the LMP7721 ideal for transimpedance amplification.
LMP7721 as pH Electrode Amplifier
The following diagram shows the LMP7721 package.
LMP7721 Package
| Number of Channels (#) | 1 |
| Total Supply Voltage (Min) (+5V=5, +/-5V=10) | 1.8 |
| Total Supply Voltage (Max) (+5V=5, +/-5V=10) | 5.5 |
| GBW (Typ) (MHz) | 17 |
| Slew Rate (Typ) (V/us) | 10.5 |
| Rail-to-Rail | In to V- Out |
| Vos (Offset Voltage @ 25C) (Max) (mV) | 0.15 |
| Offset Drift (Typ) (uV/C) | 1.5 |
| Iq per channel (Typ) (mA) | 1.3 |
| Vn at 1kHz (Typ) (nV/rtHz) | 6.5 |
| CMRR (Typ) (dB) | 100 |
| Rating | Catalog |
| Operating Temperature Range (C) | -40 to 125 |
| Package Group | SOIC |
| Approx. Price (US$) | 1.65 | 1ku |
| Package Size: mm2:W x L (PKG) | 8SOIC: 29 mm2: 6 x 4.9(SOIC) |
| Input Bias Current (Max) (pA) | 0.02 |
| Output Current (Typ) (mA) | 22 |
| Additional Features | N/A |
| Architecture | CMOS |
Texas Instruments Incorporated (TI) is a global semiconductor design and manufacturing company that develops analog ICs and embedded processors. By employing the world's brightest minds, TI creates innovations that shape the future of technology. TI is helping more than 100,000 customers transform the future, today.
You can download LMP7721 datasheet from the link given below:
Note: Please check their parameters and pin configuration before replacing them in your circuit.
3 fA.
Patent-pending.
Ultra-low.
In FET input amplifiers, the bias current is the gate leakage current of an FET, which is the leakage current of a reverse-biased junction diode. Such leakage currents double for every 10 °C rise in junction temperature.
In order for the input transistor to operate, the base current (IB) must flow. This base current is the input bias current. In actual use, when a resistor with a high resistance (RIN) is inserted at the input, the input bias current is used to express the input signal error.
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