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Texas Instruments THS3122IDRG4
- Part No.:
- THS3122IDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3122IDRG4.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,199
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Product details
Overview
THS3122IDRG4 from Texas Instruments is a dual-channel, bipolar-input, current-feedback amplifier optimized for high-output-current, low-distortion video and instrumentation signal conditioning. It delivers 450 mA output drive, 128-MHz –3-dB bandwidth (RL = 50 Ω), 1550-V/µs slew rate (G = 2), and 2.2-nV/√Hz input voltage noise - enabling clean amplification of fast, heavy-loaded signals in industrial video distribution and precision line driving.
For engineers reviewing the THS3122IDRG4 datasheet, THS3122IDRG4 pinout, THS3122IDRG4 application, or THS3122IDRG4 equivalent, key selection criteria include its ±5 V to ±15 V dual-supply operation, SOIC-8 package with PowerPAD thermal enhancement, shutdown-incompatible design (vs. THS3125), and verified performance driving 50-Ω loads with <0.01% differential gain error at NTSC/PAL video frequencies.
Technical Context
The THS3122IDRG4 implements a current-feedback architecture with high-impedance noninverting inputs (1.5 MΩ) and low-impedance inverting inputs (15 Ω), enabling wide bandwidth independent of closed-loop gain. Its transimpedance open-loop gain exceeds 1 MΩ, supporting stable operation with RF ≥ 430 Ω across gains of –1, +1, and +2.
It features matched input bias currents (IN+ ≈ 0.33–2 µA, IN– ≈ 6–23 µA), low input offset voltage (±25 mV max), and robust common-mode rejection (60–67 dB) over ±2.5 V to ±12.7 V input range - making it suitable for DC-coupled, high-fidelity analog signal paths where channel matching and thermal drift (10 µV/°C) matter.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 128 MHz @ RL = 50 Ω, RF = 470 Ω, G = 2 - supports full HD video baseband amplification without roll-off |
| Slew Rate | 1550 V/µs @ ±15 V, G = 2, RL = 50 Ω - enables faithful reproduction of fast transient edges in pulse and video signals |
| Output Current | 450 mA continuous per channel - drives four 75-Ω serially terminated video lines or low-Z piezo actuators |
| Voltage Noise | 2.2 nV/√Hz @ 10 kHz - preserves SNR in low-level signal amplification stages before ADCs or filters |
| Distortion (THD) | –80 dBc @ 1 MHz, 2 VPP, G = 2 - meets broadcast-grade video differential gain/phase error specs (<0.01%) |
| Supply Range | ±5 V to ±15 V dual supply - accommodates legacy industrial rails and high-swing analog front ends |
| Quiescent Current | 9 mA per channel @ ±15 V - balances speed and power in always-on signal chain stages |
Pinout & Package
THS3122IDRG4 is housed in an 8-pin SOIC (D) package with exposed PowerPAD thermal pad on the underside, requiring PCB copper connection for reliable heat dissipation at full output current.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Amplifier 1 output | Low-impedance current-feedback output node; connects directly to load or feedback network |
| 1 IN− | Inverting input (amp 1) | Low-impedance (15 Ω) summing node; sets closed-loop gain with external RF resistor |
| 1 IN+ | Noninverting input (amp 1) | High-impedance (1.5 MΩ) input; referenced to system ground or bias voltage |
| VCC− | Negative power supply | Return path for internal bias and output stage; must be low-inductance connection |
| VCC+ | Positive power supply | Primary supply rail for output swing and internal circuitry; decoupling required |
| 2 OUT | Amplifier 2 output | Independent output channel; electrically isolated but thermally coupled to amp 1 |
| 2 IN− | Inverting input (amp 2) | Second low-Z input node; supports dual-channel parallel or differential configurations |
| 2 IN+ | Noninverting input (amp 2) | Second high-Z input; enables independent signal routing or matched gain staging |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback topology | Bandwidth remains stable across gain settings - simplifies layout for multi-gain systems |
| PowerPAD thermal package | 67°C/W junction-to-ambient (DDA variant); enables 450-mA output without derating at +85°C |
| Matched channel offset | ≤4 mV inter-channel offset voltage - critical for differential signal integrity and balanced line drivers |
| Low distortion at heavy loads | –80 dBc THD driving 50 Ω @ 1 MHz - eliminates need for external buffering in video distribution amps |
| Wide common-mode input range | ±12.7 V @ ±15 V supply - supports DC-coupled inputs in ±10 V industrial sensor interfaces |
Applications
| Video Distribution | Instrumentation Signal Conditioning |
|---|---|
Use Scenario: Amplifying and distributing composite NTSC/PAL video signals to multiple monitors or recording devices with serial 75-Ω termination. IC Role / Device Role / Timing Role: Dual-channel current-feedback amplifier providing gain, drive strength, and impedance matching for baseband video. Use Value: Achieves <0.01% differential gain error and <0.011° phase error - meeting broadcast compliance without external calibration. | Use Scenario: Conditioning low-amplitude sensor outputs (e.g., strain gauges, RTDs) prior to ADC sampling in automated test equipment. IC Role / Device Role / Timing Role: High-speed, low-noise gain block preserving signal fidelity across DC to 10 MHz bandwidth. Use Value: 2.2-nV/√Hz voltage noise and 10 µV/°C offset drift ensure sub-16-bit measurement accuracy over temperature. |
| High-Current Line Driving | Piezo Actuator Control |
Use Scenario: Driving long coaxial cables or multiple parallel loads in industrial PLC I/O modules requiring >200 mA per channel. IC Role / Device Role / Timing Role: Robust output buffer delivering 450 mA into reactive or resistive loads with minimal overshoot. Use Value: Sustains 26-VPP swing into 50 Ω while maintaining –80 dBc THD - eliminating need for discrete MOSFET output stages. | Use Scenario: Generating fast, high-voltage waveforms (e.g., triangle, burst) to drive piezoelectric transducers in ultrasonic cleaning or medical imaging systems. IC Role / Device Role / Timing Role: High-slew-rate voltage amplifier converting DAC outputs into precise mechanical actuation signals. Use Value: 1550-V/µs slew rate and 128-MHz bandwidth enable <100 ns edge control - critical for resonant frequency excitation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-current, current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3122CDRG4 | Same electrical specs, but rated for 0°C to +70°C commercial temperature range vs. THS3122IDRG4's –40°C to +85°C industrial grade | Not suitable for extended-temperature industrial or automotive under-hood environments | Select THS3122IDRG4 when operating beyond 70°C ambient or requiring AEC-Q200-aligned reliability screening |
| THS3122IDDA | Identical electrical performance and temperature rating, but in HSOP-8 PowerPAD (DDA) package with lower θJA (67°C/W vs. 95°C/W) | Better thermal performance allows sustained 450-mA output at higher ambient temperatures | Choose THS3122IDDA when PCB layout permits larger footprint and thermal relief is prioritized over SOIC-8 compatibility |
Compared with THS3122CDRG4, THS3122IDRG4 ensures operation across –40°C to +85°C without derating; compared with THS3122IDDA, it trades thermal efficiency for standard SOIC-8 footprint compatibility - both alternatives retain identical gain stability, noise, and distortion performance.
Availability
THS3122IDRG4 is available at Aetrix Electronics and suitable for video distribution, instrumentation signal conditioning, and high-current line driving requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for THS3122IDRG4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in high-speed amplifiers and precision signal chains.
The THS3122IDRG4 belongs to TI's THS312x family of current-feedback amplifiers, designed specifically for demanding applications requiring simultaneous high bandwidth, high output current, and low distortion - especially in video infrastructure and test equipment.
FAQ
What is the maximum safe output current for THS3122IDRG4?
The THS3122IDRG4 is rated for 450 mA continuous output current per channel under recommended operating conditions. Absolute maximum ratings permit up to 550 mA, but sustained operation above 450 mA requires careful thermal management via the PowerPAD and PCB copper area, especially at elevated ambient temperatures. Derating is advised above +70°C ambient.
Does THS3122IDRG4 support shutdown functionality?
No, THS3122IDRG4 does not include shutdown capability. That feature is exclusive to the THS3125 variant (e.g., THS3125ID). The THS3122IDRG4 lacks SHUTDOWN and REF pins - its pinout is fixed to eight functional terminals (two amplifiers × three pins + two supplies). For power-gated designs, external enable circuitry or a THS3125-based solution is required.
What is the minimum recommended feedback resistor value for THS3122IDRG4?
The THS3122IDRG4 requires RF ≥ 430 Ω for stable operation at G = 2, as validated in the datasheet's small-signal gain plots. Using RF < 430 Ω risks peaking or oscillation due to reduced phase margin. At G = 1, RF ≥ 500 Ω is recommended. Always verify stability with actual layout parasitics using SPICE simulation or bench testing.
Can THS3122IDRG4 drive 75-Ω video loads directly?
Yes, THS3122IDRG4 is characterized driving 75-Ω serially terminated video loads, achieving <0.01% differential gain error and <0.011° phase error at NTSC/PAL frequencies. It delivers 26-VPP into 50 Ω and maintains –80 dBc THD - making it suitable for direct connection to 75-Ω coaxial outputs without additional buffering or level-shifting.
Is THS3122IDRG4 pin-compatible with THS3122CDRG4?
Yes, THS3122IDRG4 and THS3122CDRG4 share identical SOIC-8 (D) package dimensions, pinout, and electrical interface. The only difference is temperature grade: THS3122IDRG4 is rated for –40°C to +85°C (industrial), while THS3122CDRG4 is rated for 0°C to +70°C (commercial). No PCB redesign is needed when upgrading from C- to I-suffix variants.
THS3122IDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 1550V/µs
- Gain Bandwidth Product:
- 138 MHz
- -3db Bandwidth:
- 160 MHz
- Current - Input Bias:
- 6 µA
- Voltage - Input Offset:
- 4.4 mV
- Current - Supply:
- 8.4mA (x2 Channels)
- Current - Output / Channel:
- 440 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS3122IDRG4 FAQ
1.How can I place an order for THS3122IDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3122IDRG4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for THS3122IDRG4 reliable?
The price and inventory of THS3122IDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3122IDRG4 is usually 5 days.
3.What payment methods are accepted for THS3122IDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3122IDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3122IDRG4?
THS3122IDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3122IDRG4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for THS3122IDRG4?
For technical support, including THS3122IDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3122IDRG4 requirements.
6.How does Aetrix verify that THS3122IDRG4 is sourced from the original manufacturer or authorized distributors?
All THS3122IDRG4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that THS3122IDRG4 meets industry standards.
7.What is the process for return or replacement of THS3122IDRG4?
All THS3122IDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with THS3122IDRG4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The THS3122IDRG4 part is unused and in its original packaging.
Return procedure for THS3122IDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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