Overview
The LM7705MMX/NOPB is a low-noise negative bias generator produced by Texas Instruments. This device is a switched capacitor voltage inverter designed to provide a fixed negative voltage of -0.23 V. It is particularly useful in applications where low-voltage amplifiers need to achieve a true zero output voltage without exceeding the maximum supply voltage ratings of the amplifier.
The LM7705MMX/NOPB operates with a single positive supply voltage, making it a cost-effective solution compared to dual-supply configurations. It features high conversion efficiency, low quiescent current, and a compact 8-pin VSSOP package, making it suitable for a variety of electronic systems.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | LM7705MMX/NOPB |
| Package Type | 8-Pin VSSOP (DGK) |
| Operating Temperature Range | -40°C to 125°C |
| Supply Voltage | 3 V to 5.25 V |
| Output Voltage | -0.232 V (Fixed) |
| Output Voltage Tolerance | 5% |
| Output Voltage Ripple | 4 mV PP |
| Quiescent Current | 78 µA |
| Shutdown Current | 20 nA |
| Turn-on Time | 500 µs |
| Conversion Efficiency | Up to 98% |
| Logic Function | Inverting |
| Switching Frequency | 92 kHz |
Key Features
- Low Noise Negative Bias Generator: Provides a fixed negative voltage of -0.23 V, ideal for low-voltage amplifier applications.
- Single Positive Supply Operation: Operates with a single positive supply voltage, reducing the need for dual-supply configurations and associated costs.
- High Conversion Efficiency: Achieves conversion efficiencies of up to 98%.
- Low Quiescent Current: Features a quiescent current of 78 µA, minimizing power consumption.
- Compact Packaging: Available in an 8-pin VSSOP package, suitable for space-constrained designs.
- Shutdown Capability: Includes a shutdown pin to minimize standby power consumption.
- Wide Operating Temperature Range: Operates over a temperature range of -40°C to 125°C.
Applications
- Low-Voltage Amplifiers: Enables amplifiers to achieve a true zero output voltage without exceeding the maximum supply voltage ratings.
- ADC Input Stages: Allows amplifiers to drive ADC inputs with a zero voltage signal, utilizing the full input range of the ADC.
- Signal Processing Chains: Prevents amplifier output saturation at zero volts, maintaining signal accuracy through the processing chain.
- General Electronic Systems: Suitable for any application requiring a low-noise, fixed negative voltage supply.
Q & A
- What is the primary function of the LM7705MMX/NOPB?
The LM7705MMX/NOPB is a low-noise negative bias generator that provides a fixed negative voltage of -0.23 V.
- What is the operating temperature range of the LM7705MMX/NOPB?
The device operates over a temperature range of -40°C to 125°C.
- What is the supply voltage range for the LM7705MMX/NOPB?
The supply voltage range is from 3 V to 5.25 V.
- What is the quiescent current of the LM7705MMX/NOPB?
The quiescent current is 78 µA.
- Does the LM7705MMX/NOPB have a shutdown feature?
- What is the typical turn-on time for the LM7705MMX/NOPB?
The turn-on time is 500 µs.
- What is the switching frequency of the LM7705MMX/NOPB?
The switching frequency is 92 kHz.
- What type of package does the LM7705MMX/NOPB come in?
The device is available in an 8-pin VSSOP package.
- Is the LM7705MMX/NOPB RoHS compliant?
- What are some common applications for the LM7705MMX/NOPB?
