Overview
The THS3121IDGNRG4, produced by Texas Instruments, is a high-performance, low-noise, high-voltage current-feedback amplifier. This device is part of the THS3120 and THS3121 series, known for their well-regulated AC performance and high output current drive capabilities. The THS3121IDGNRG4 is specifically packaged in an MSOP-8 (DGN) PowerPAD™ package and is designed to operate over a wide temperature range of –40°C to +85°C.
Key Specifications
| Parameter | Typical Value | Minimum Value | Maximum Value | Unit |
|---|---|---|---|---|
| Small-signal bandwidth, –3 dB (G = 2, RL = 50 Ω, VS = ±15 V) | 120 | - | - | MHz |
| Slew Rate (RL = 50 Ω, VO = 8 VPP) | 1700 | - | - | V/μs |
| Input Common-Mode Voltage Range (VS = ±15 V) | - | ±12.2 | ±12.7 | V |
| Output Voltage Swing (RL = 50 Ω, VS = ±15 V) | - | ±12 | ±13.5 | V |
| Output Current (Sourcing, RL = 25 Ω, VS = ±15 V) | - | 400 | 475 | mA |
| Output Current (Sinking, RL = 25 Ω, VS = ±15 V) | - | 400 | 490 | mA |
| Quiescent Current (VS = ±15 V) | 7 | 4 | 11 | mA |
| Power-Supply Rejection Ratio (+PSRR, VS = ±15 V) | - | 60 | 75 | dB |
| Power-Supply Rejection Ratio (–PSRR, VS = ±15 V) | - | 55 | 69 | dB |
Key Features
- Low Noise and High Bandwidth: The THS3121IDGNRG4 offers a high small-signal bandwidth of up to 120 MHz and a low noise floor, making it suitable for high-frequency applications.
- High Output Current Drive: Capable of sourcing and sinking high output currents, up to 475 mA and 490 mA respectively, at a load resistance of 25 Ω.
- Wide Supply Range: Operates over a wide supply voltage range from ±5 V to ±15 V.
- High Slew Rate: Features a high slew rate of 1700 V/μs, enabling high output voltage swings at high frequencies.
- Power-Down Feature (THS3120 Only): The THS3120 version includes a power-down feature, reducing quiescent current significantly when disabled.
- Compact Packaging: Available in MSOP-8 (DGN) PowerPAD™ package, suitable for space-constrained designs.
Applications
- Video Distribution: Ideal for video distribution applications due to its high bandwidth and low distortion characteristics.
- Power FET Driver: Suitable for driving power FETs in various power management and control systems.
- Pin Driver: Can be used as a pin driver in high-speed digital systems.
- Capacitive Load Driver: Capable of driving capacitive loads efficiently, making it useful in applications such as audio and medical equipment.
Q & A
- What is the typical small-signal bandwidth of the THS3121IDGNRG4 at a gain of 2 and supply voltage of ±15 V?
The typical small-signal bandwidth is 120 MHz.
- What is the slew rate of the THS3121IDGNRG4?
The slew rate is 1700 V/μs.
- What is the input common-mode voltage range for the THS3121IDGNRG4?
The input common-mode voltage range is ±12.2 V to ±12.7 V.
- What is the maximum output voltage swing for the THS3121IDGNRG4 at a load resistance of 50 Ω and supply voltage of ±15 V?
The maximum output voltage swing is ±13.5 V.
- What is the quiescent current of the THS3121IDGNRG4 at a supply voltage of ±15 V?
The quiescent current ranges from 4 mA to 11 mA.
- Does the THS3121IDGNRG4 have a power-down feature?
No, the power-down feature is available only in the THS3120 version.
- What are the typical applications of the THS3121IDGNRG4?
Typical applications include video distribution, power FET driving, pin driving, and capacitive load driving.
- What is the operating temperature range of the THS3121IDGNRG4?
The operating temperature range is –40°C to +85°C.
- What is the package type of the THS3121IDGNRG4?
The package type is MSOP-8 (DGN) PowerPAD™.
- What is the power-supply rejection ratio (PSRR) of the THS3121IDGNRG4?
The PSRR is typically 60 dB for positive PSRR and 55 dB for negative PSRR at ±15 V supply.
