Overview
The THS4521HD, produced by Texas Instruments, is a very low-power, fully differential operational amplifier (op amp) designed for applications requiring high performance and low power consumption. This device features a rail-to-rail output and an input common-mode range that includes the negative rail, making it suitable for low-power data acquisition systems and high-density applications. The THS4521HD is characterized for operation over an extreme temperature range of –55°C to 210°C, making it ideal for high-temperature environments such as down-hole drilling.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Bandwidth | 145 MHz (AV = 1 V/V) | MHz |
| Slew Rate | 490 V/μs | V/μs |
| Second Harmonic Distortion (HD2) | –133 dBc at 10 kHz (1 VRMS, RL = 1 kΩ) | dBc |
| Third Harmonic Distortion (HD3) | –141 dBc at 10 kHz (1 VRMS, RL = 1 kΩ) | dBc |
| Input Voltage Noise | 4.6 nV/√Hz (f = 100 kHz) | nV/√Hz |
| Total Harmonic Distortion + Noise (THD+N) | –112 dBc (0.00025%) at 1 kHz (22-kHz BW, G = 1, 5 VPP) | dBc |
| Open-Loop Gain | 119 dB (DC) | dB |
| Power Supply Voltage | +2.5 V (±1.25 V) to +5.5 V (±2.75 V) | V |
| Quiescent Current per Channel | 1.14 mA | mA |
| Power-Down Current | 20 μA (typical) | μA |
Key Features
- Fully differential architecture
- Negative rail input (NRI)
- Rail-to-rail output (RRO)
- Output common-mode control with low offset and drift
- Low power consumption with power-down capability
- Operates over an extreme temperature range of –55°C to 210°C
- Accurate output common-mode control for dc-coupling with analog-to-digital converters (ADCs)
Applications
- Low-power SAR (Successive-Approximation Register) and ΔΣ (Delta-Sigma) ADC drivers
- Low-power differential drivers
- Low-power differential signal conditioning
- Low-power, high-performance differential audio amplifiers
- High-temperature environments such as down-hole drilling
Q & A
- What is the bandwidth of the THS4521HD?
The bandwidth of the THS4521HD is 145 MHz at a gain of 1 V/V.
- What is the slew rate of the THS4521HD?
The slew rate of the THS4521HD is 490 V/μs.
- What are the harmonic distortion specifications of the THS4521HD?
The THS4521HD has a second harmonic distortion (HD2) of –133 dBc and a third harmonic distortion (HD3) of –141 dBc at 10 kHz with 1 VRMS and RL = 1 kΩ.
- What is the input voltage noise of the THS4521HD?
The input voltage noise of the THS4521HD is 4.6 nV/√Hz at 100 kHz.
- What is the total harmonic distortion + noise (THD+N) of the THS4521HD?
The THD+N of the THS4521HD is –112 dBc (0.00025%) at 1 kHz with a 22-kHz bandwidth, gain of 1, and 5 VPP.
- What is the open-loop gain of the THS4521HD?
The open-loop gain of the THS4521HD is 119 dB (DC).
- What is the power supply voltage range for the THS4521HD?
The power supply voltage range for the THS4521HD is +2.5 V (±1.25 V) to +5.5 V (±2.75 V).
- What is the quiescent current per channel of the THS4521HD?
The quiescent current per channel of the THS4521HD is 1.14 mA.
- Does the THS4521HD have a power-down capability?
Yes, the THS4521HD has a power-down capability with a typical current of 20 μA.
- What are the typical applications of the THS4521HD?
The THS4521HD is typically used in low-power SAR and ΔΣ ADC drivers, low-power differential drivers, low-power differential signal conditioning, and low-power, high-performance differential audio amplifiers. It is also suitable for high-temperature environments such as down-hole drilling.
