Overview
The THS4531A device, produced by Texas Instruments, is a low-power, fully differential amplifier designed for low-power data acquisition systems and high-density applications. It features an input common-mode range below the negative rail and rail-to-rail output, making it ideal for applications where power consumption and dissipation are critical. The device is particularly useful for driving analog-to-digital converters (ADCs) such as successive-approximation registers (SARs) and delta-sigma (ΔΣ) ADCs, using single-supply 2.5-V to 5-V power.
Key Specifications
| Parameter | Value | Units |
|---|---|---|
| Supply Voltage | 2.5 to 5.5 | V |
| Quiescent Current | 250 | µA |
| Power-Down Mode Current | 0.5 (typical) | µA |
| Bandwidth | 36 | MHz (Av = 1 V/V) |
| Slew Rate | 200 | V/µs |
| Total Harmonic Distortion (THD) | -120 dBc at 1 kHz (1 VRMS, RL = 2 kΩ) | |
| Input Voltage Noise | 10 nV/√Hz (f = 1 kHz) | |
| Offset Voltage (VOS) | ±100 µV | |
| Offset Voltage Drift (VOSDrift) | ±3 µV/°C (–40°C to +125°C) | |
| Open-Loop Gain (AOL) | 114 dB | |
| Operating Temperature Range | -40 to 125 | °C |
| Package Options | 8-Pin SOIC (D), 8-Pin VSSOP (DGK), 10-Pin WQFN (RUN) |
Key Features
- Ultra-low power consumption: 250 µA typical, 0.5 µA in power-down mode
- Fully differential architecture
- Rail-to-rail output (RRO) and negative rail input (NRI)
- Accurate output common-mode control for DC coupling with ADCs
- High DC accuracy: VOS ±100 µV, VOSDrift ±3 µV/°C
- High open-loop gain: 114 dB
- Low total harmonic distortion: -120 dBc at 1 kHz
- Low input voltage noise: 10 nV/√Hz at 1 kHz
- Available in 8-Pin SOIC (D), 8-Pin VSSOP (DGK), and 10-Pin WQFN (RUN) packages
Applications
- Low-power data acquisition systems
- High-density applications where power consumption and dissipation are critical
- Driving analog-to-digital converters (ADCs) such as SARs and ΔΣ ADCs
- Differential to differential and single-ended to differential signal conditioning
- Low-power, wide-bandwidth differential drivers and signal conditioning
- General-purpose, low-power differential signal conditioning applications
Q & A
- What is the typical quiescent current of the THS4531A?
The typical quiescent current of the THS4531A is 250 µA.
- What are the available package options for the THS4531A?
The THS4531A is available in 8-Pin SOIC (D), 8-Pin VSSOP (DGK), and 10-Pin WQFN (RUN) packages.
- What is the bandwidth of the THS4531A?
The bandwidth of the THS4531A is 36 MHz (Av = 1 V/V).
- What is the input voltage noise of the THS4531A at 1 kHz?
The input voltage noise of the THS4531A at 1 kHz is 10 nV/√Hz.
- What is the typical power-down mode current of the THS4531A?
The typical power-down mode current of the THS4531A is 0.5 µA.
- What is the operating temperature range of the THS4531A?
The operating temperature range of the THS4531A is -40°C to 125°C.
- What is the open-loop gain of the THS4531A?
The open-loop gain of the THS4531A is 114 dB.
- What are some common applications of the THS4531A?
The THS4531A is commonly used in low-power data acquisition systems, high-density applications, and for driving ADCs such as SARs and ΔΣ ADCs.
- Does the THS4531A support rail-to-rail output and negative rail input?
Yes, the THS4531A supports rail-to-rail output (RRO) and negative rail input (NRI).
- What is the slew rate of the THS4531A?
The slew rate of the THS4531A is 200 V/µs.
