Overview
The OPA2684IDCNRG4, produced by Texas Instruments, is a low-power, dual current-feedback operational amplifier. This CFBPLUS amplifier is designed to provide enhanced performance over earlier low-power current-feedback amplifiers. It features an internally closed-loop input buffer stage that significantly improves bandwidth and harmonic distortion. The OPA2684 is suitable for a wide range of applications requiring high bandwidth, low distortion, and low power consumption.
Key Specifications
| Parameter | Typical Value | Minimum Value | Maximum Value | Units |
|---|---|---|---|---|
| Small-Signal Bandwidth (G = +2, RF = 800Ω) | 170 | 120 | - | MHz |
| Small-Signal Bandwidth (G = +10, RF = 800Ω) | 120 | - | - | MHz |
| Low Distortion | -82 | - | - | dBc at 5MHz |
| High Output Current | 120 | - | - | mA |
| Supply Voltage Range | +5V to +12V (Single Supply) | ±2.5V to ±6.0V (Dual Supply) | - | V |
| Supply Current | 3.4 | - | - | mA |
| Operating Temperature Range | -40 to 85 | - | - | °C |
Key Features
- Minimal bandwidth change versus gain
- High bandwidth: up to 170MHz at G = +2
- Low distortion: < –82dBc at 5MHz
- High output current: 120mA
- Single +5V to +12V supply operation and dual ±2.5 to ±6.0V supply operation
- Low supply current: 3.4mA total
- Internally closed-loop input buffer stage for improved performance
Applications
- Short-loop ADSL CO drivers
- Low-power broadcast video drivers
- Differential equalizing filters
- Differential SAW filter post amplifiers
- Multi-channel summing amplifiers
- Professional cameras
- ADC input drivers
Q & A
- What is the OPA2684IDCNRG4?
The OPA2684IDCNRG4 is a low-power, dual current-feedback operational amplifier produced by Texas Instruments.
- What is the typical bandwidth of the OPA2684 at a gain of +2?
The typical bandwidth at a gain of +2 is 170MHz.
- What is the maximum output current of the OPA2684?
The maximum output current is 120mA.
- What are the supply voltage ranges for the OPA2684?
The OPA2684 can operate on a single supply from +5V to +12V and on a dual supply from ±2.5V to ±6.0V.
- What is the typical supply current of the OPA2684?
The typical supply current is 3.4mA.
- What is the operating temperature range of the OPA2684?
The operating temperature range is from -40°C to 85°C.
- What are some common applications of the OPA2684?
Common applications include short-loop ADSL CO drivers, low-power broadcast video drivers, differential equalizing filters, and professional cameras.
- How does the internally closed-loop input buffer stage improve performance?
The internally closed-loop input buffer stage enhances bandwidth and reduces harmonic distortion by providing a very low and linearized impedance path at the inverting input.
- What is the significance of the CFBPLUS architecture in the OPA2684?
The CFBPLUS architecture retains the benefits of low power operation while providing many of the benefits of a more ideal current-feedback amplifier, such as minimal bandwidth change versus gain and improved harmonic distortion.
- Can the OPA2684 be used in high-gain applications?
