Overview
The LMH6618MKX/NOPB is a high-speed, low-power operational amplifier from Texas Instruments, formerly National Semiconductor. This single-channel amplifier is part of the PowerWise® family, known for its exceptional power-to-performance ratio. It features a rail-to-rail input and output design, making it suitable for a wide range of applications requiring high speed, low noise, and the ability to drive complex loads such as ADCs and video signals.
The LMH6618 operates over a voltage range of 2.7V to 11V and consumes a typical supply current of 1.25 mA per channel at 5V. It is available in a space-saving 6-Pin SOT package and is offered with an extended industrial temperature grade of −40°C to +125°C.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Operating Voltage Range | 2.7 | 11 | V | ||
| Supply Current per Channel | At 5V | 1.25 | 1.5 | 1.7 | mA |
| Small Signal Bandwidth | AV = 1, RL = 1 kΩ, VOUT = 0.2 VPP | 120 | MHz | ||
| Gain Bandwidth Product | AV = 10, RF = 2 kΩ, RG = 221Ω | 54 | 65 | MHz | |
| Output Voltage Swing High | RL = 1 kΩ to V+/2 at 5V | 60 | 73 | 82 | mV from V+ Supply Rail |
| Output Voltage Swing Low | RL = 1 kΩ to V+/2 at 5V | 75 | 83 | 96 | mV from V− Supply Rail |
| Linear Output Current | VOUT = V+/2 | ±25 | ±35 | mA | |
| Input Offset Voltage | VCM = 0.5V | 0.1 | ±0.75 | mV | |
| Common Mode Voltage Range | DC, CMRR ≥65 dB | −0.2 | 5.2 | V | |
| Power Supply Rejection Ratio | DC, VCM = 0.5V, VS = 2.7V to 11V | 84 | 104 | dB |
Key Features
- Rail-to-rail input and output design for maximum signal dynamic range.
- High speed with a small signal bandwidth of 130 MHz and gain bandwidth product of up to 65 MHz.
- Low noise with a voltage noise of 10 nV/√Hz.
- Low power consumption with a typical supply current of 1.25 mA per channel at 5V.
- High open loop gain and balanced inputs for ease of use in active filter designs.
- Fast settling time to 0.01% in 120 ns.
- High SFDR (Spurious-Free Dynamic Range) of 100 dBc at 100 kHz.
- Ability to drive up to 30 pF loads without external compensation.
- Active low disable pin reducing supply current to 72 µA.
Applications
- ADC and DAC drivers for high-speed data acquisition systems.
- Video and audio signal processing.
- Active filter design.
- High-speed instrumentation and medical equipment.
- Industrial control systems requiring high accuracy and low noise.
Q & A
- What is the operating voltage range of the LMH6618?
The operating voltage range of the LMH6618 is from 2.7V to 11V.
- What is the typical supply current per channel at 5V?
The typical supply current per channel at 5V is 1.25 mA.
- What is the small signal bandwidth of the LMH6618?
The small signal bandwidth of the LMH6618 is 130 MHz.
- What is the gain bandwidth product of the LMH6618?
The gain bandwidth product of the LMH6618 is up to 65 MHz.
- How much output voltage swing can the LMH6618 achieve?
The LMH6618 can achieve an output voltage swing within 37 mV of the ground rail and 77 mV of either rail with different load conditions.
- What is the input offset voltage of the LMH6618?
The input offset voltage of the LMH6618 is typically 0.1 mV.
- What is the common mode voltage range of the LMH6618?
The common mode voltage range of the LMH6618 extends 200 mV beyond the supply rails.
- Can the LMH6618 drive capacitive loads without external compensation?
Yes, the LMH6618 can drive up to 30 pF loads without external compensation.
- What is the purpose of the active low disable pin?
The active low disable pin reduces the supply current to 72 µA when disabled.
- What are some typical applications of the LMH6618?
The LMH6618 is typically used in ADC and DAC drivers, video and audio signal processing, active filter design, and high-speed instrumentation.
