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Texas Instruments THS3125CDG4
- Part No.:
- THS3125CDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3125CDG4.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,445
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Product details
Overview
THS3125CDG4 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), 2.2-nV/√Hz voltage noise, and features a low-power shutdown mode reducing quiescent current to 370 µA per channel - enabling use in multi-channel video distribution systems with serially terminated 75-Ω loads.
For engineers reviewing the THS3125CDG4 datasheet, THS3125CDG4 pinout, THS3125CDG4 application, or THS3125CDG4 equivalent, key selection considerations include its HTSSOP-14 PowerPAD™ package thermal performance, REF-pin–referenced shutdown threshold control, differential gain error <0.01% at NTSC/PAL, and compatibility with ±5 V to ±15 V dual supplies or 10 V to 30 V single supply operation.
Technical Context
The THS3125CDG4 implements a current-feedback architecture with high-impedance noninverting inputs and low-impedance inverting inputs, enabling wide bandwidth independent of closed-loop gain. Its transimpedance gain stage drives a Class-AB output stage capable of ±230 mA into 50 Ω while maintaining –80 dBc THD at 1 MHz and 2 VPP.
Shutdown functionality is controlled via the SHUTDOWN pin referenced to the externally biased REF pin, allowing precise rail-relative enable/disable thresholds (Enable: REF + 0.8 V; Disable: REF + 2 V). The device draws only 370 µA per channel in shutdown, with 200 µs enable and 500 µs disable times, and requires thermal connection of the PowerPAD™ to PCB ground for rated 3.3 W power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 128 MHz at G = 2, RL = 50 Ω, ±15 V supply - supports full HD video baseband signal amplification without gain peaking. |
| Slew Rate | 1550 V/µs at G = 2, RL = 50 Ω - enables clean reproduction of fast transient video sync pulses and composite waveforms. |
| Output Current Drive | ±450 mA peak - sufficient to drive four 75-Ω serially terminated video lines simultaneously with <0.01% differential gain error. |
| Voltage Noise | 2.2 nV/√Hz at 10 kHz - preserves SNR in low-level analog signal paths such as medical instrumentation front-ends. |
| Shutdown Quiescent Current | 370 µA per channel - reduces system standby power by >95% versus active mode (8.4 mA), critical for battery-backed modules. |
| Input Common-Mode Range | ±12.7 V at ±15 V supply - accommodates large-swing DC-coupled sensor signals without level-shifting circuitry. |
| THD | –80 dBc at 1 MHz, 2 VPP, G = 2 - meets broadcast-grade video distortion requirements for SD/HD component outputs. |
Pinout & Package
THS3125CDG4 is housed in a 14-pin HTSSOP PowerPAD™ (PWP) package (5.00 mm × 4.40 mm) with an exposed thermal pad on the underside requiring solder connection to a PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN+ | Noninverting input, Channel 1 | High-impedance node (1.5 MΩ) for signal source connection; sets gain polarity and common-mode range. |
| 1 IN− | Inverting input, Channel 1 | Low-impedance current-summing node (15 Ω); feedback network connects here to set transimpedance gain. |
| 1 OUT | Output, Channel 1 | Class-AB output capable of ±450 mA into 50 Ω; requires external feedback resistor for stability and gain setting. |
| VCC− | Negative power supply | Connects to system negative rail (–5 V to –15 V); must be decoupled near package with ≥1 µF ceramic capacitor. |
| N/C (Pins 5, 7, 8, 10) | No internal connection | Unbonded die pads; must remain unconnected and unstubbed to avoid parasitic coupling or EMI. |
| REF | Shutdown reference voltage | Bias point for SHUTDOWN threshold; typically tied to VCC− or mid-rail to define enable/disable voltages relative to supply rails. |
| VCC+ | Positive power supply | Connects to system positive rail (+5 V to +15 V); requires local ≥1 µF ceramic decoupling adjacent to pin. |
| 2 OUT | Output, Channel 2 | Independent high-current output identical to Channel 1; supports dual-channel video line drivers or parallel signal paths. |
| 2 IN− | Inverting input, Channel 2 | Separate current-summing node for second amplifier; allows independent gain configuration per channel. |
| 2 IN+ | Noninverting input, Channel 2 | Independent high-Z input for second signal path; channel offset matching ≤4 mV ensures balanced dual-channel performance. |
| SHUTDOWN | Active-low shutdown control | Logic input referenced to REF; drives amplifier into low-power state when pulled above REF + 2 V (disable threshold). |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback architecture | Bandwidth remains stable across gain settings - eliminates trade-off between gain and speed in video line drivers. |
| PowerPAD™ thermal package | 37.5°C/W junction-to-ambient thermal resistance enables 3.3 W continuous dissipation with proper PCB copper area. |
| REF-referenced shutdown | Enables rail-agnostic power sequencing in mixed-supply systems; avoids need for external voltage dividers or regulators. |
| Dual-channel matching | Channel offset voltage matching ≤4 mV and crosstalk ≤–67 dBc ensure minimal inter-channel interference in stereo or dual-sensor systems. |
| Video-optimized distortion performance | Differential gain/phase errors <0.01% / 0.011° at NTSC/PAL - meets SMPTE 253M and ITU-R BT.601 broadcast compliance. |
Applications
| Video Distribution | Instrumentation Signal Conditioning |
|---|---|
Use Scenario: Driving four 75-Ω serially terminated SD/HD video lines from a single RGB or YPbPr source. IC Role / Device Role / Timing Role: Dual-channel current-feedback amplifier providing simultaneous gain, buffering, and DC restoration. Use Value: Maintains <0.01% differential gain error and <0.011° phase error across NTSC/PAL standards without external clamping circuits. |
Use Scenario: Amplifying low-level outputs from piezoelectric sensors or strain gauges in portable test equipment. IC Role / Device Role / Timing Role: High-speed, low-noise transimpedance preamplifier with rail-to-rail output swing capability. Use Value: 2.2-nV/√Hz input voltage noise and ±12.7-V input common-mode range preserve signal fidelity without AC coupling or level shifting. |
| Line Drivers for Industrial I/O | Piezo Actuator Drivers |
Use Scenario: Transmitting analog process signals over long cables in PLC analog output modules. IC Role / Device Role / Timing Role: Robust output driver delivering ±450 mA into reactive or capacitive cable loads. Use Value: 1550-V/µs slew rate and 128-MHz bandwidth prevent signal ringing and overshoot on 100-m+ coaxial runs. |
Use Scenario: Generating high-voltage, fast-settling drive waveforms for precision piezoelectric positioning stages. IC Role / Device Role / Timing Role: High-current, wide-swing voltage amplifier operating from ±15 V rails. Use Value: 26-VPP output swing into 50 Ω and 64-ns settling time to 0.1% support sub-microsecond step response in closed-loop motion control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-output-current, low-noise amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3125IDR | Same silicon, industrial-grade temperature range (–40°C to +85°C) vs. THS3125CDG4's commercial range (0°C to +70°C); identical pinout, electrical specs, and PowerPAD™ package. | Required for operation in extended-temperature environments such as factory automation or outdoor video enclosures. | Select THS3125IDR when ambient operating temperature exceeds +70°C or falls below 0°C; otherwise THS3125CDG4 is optimal for cost-sensitive commercial designs. |
| THS3095DR | Single-channel, higher slew rate (2000 V/µs), lower noise (1.9 nV/√Hz), but limited to ±15 V max supply and no shutdown function; SOIC-8 package lacks PowerPAD™ thermal enhancement. | Suitable for ultra-high-speed pulse amplification where shutdown is unnecessary and thermal load is lower due to single-channel operation. | Choose THS3125CDG4 for dual-channel, thermally demanding, or power-gated applications; THS3095DR only where single-channel speed and noise are prioritized over integration and thermal headroom. |
Compared with THS3125IDR, THS3125CDG4 offers lower cost and qualification for commercial environments but lacks extended temperature resilience; compared with THS3095DR, it trades marginal speed/noise improvement for dual-channel integration, thermal robustness via PowerPAD™, and system-level power management via shutdown.
Availability
THS3125CDG4 is available at Aetrix Electronics and suitable for video distribution systems, industrial line drivers, instrumentation front-ends, and piezo actuator control circuits requiring stable component supply, consistent parametric performance, and long-term manufacturability.
Supply support for THS3125CDG4 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 company specializing in analog and embedded processing technologies, with leadership in high-performance amplifiers, data converters, and power management ICs.
The THS3125CDG4 belongs to TI's THS312x family of low-noise, high-speed current-feedback amplifiers, designed specifically for demanding analog signal paths in broadcast video, test equipment, and precision motion control where output drive, bandwidth, and distortion performance are critical.
FAQ
What is the maximum safe output current for THS3125CDG4?
The THS3125CDG4 is rated for ±450 mA peak output current per channel under recommended operating conditions. Absolute maximum rating is ±550 mA, but sustained operation above ±450 mA risks thermal overload unless PCB thermal design meets the 37.5°C/W θJA spec for the HTSSOP PowerPAD™ package. Derating is required above +70°C ambient.
Does THS3125CDG4 support single-supply operation?
Yes, THS3125CDG4 supports single-supply operation from 10 V to 30 V. Input common-mode range extends to within 2.7 V of either rail, and output swing reaches within ~1.2 V of each rail into 50 Ω. For optimal performance, tie REF to mid-supply or VCC− and configure SHUTDOWN accordingly to maintain valid enable thresholds.
How does the REF pin function in THS3125CDG4 shutdown control?
The REF pin sets the reference voltage for the SHUTDOWN comparator. Enable occurs when SHUTDOWN voltage is below REF + 0.8 V; disable occurs when SHUTDOWN exceeds REF + 2 V. REF can be tied to VCC− (for ground-referenced shutdown) or to a mid-rail divider (for rail-independent control), enabling flexible power sequencing in mixed-voltage systems.
Can THS3125CDG4 drive 75-Ω video loads directly without external components?
Yes - THS3125CDG4 is characterized for driving 75-Ω serially terminated video loads with <0.01% differential gain error and <0.011° phase error at NTSC/PAL frequencies. A series 75-Ω resistor at the output is sufficient; no external clamping diodes or DC restoration circuitry is needed for standard baseband video applications.
What thermal design guidelines apply to the THS3125CDG4 HTSSOP PowerPAD™ package?
The THS3125CDG4's exposed PowerPAD™ must be soldered to a minimum 100 mm² copper pour connected to PCB ground. Use ≥4 thermal vias (0.3-mm diameter) under the pad to inner ground planes. Without this, junction temperature may exceed 150°C at full 3.3 W dissipation, triggering thermal shutdown or permanent damage.
THS3125CDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
THS3125CDG4 FAQ
1.How can I place an order for THS3125CDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3125CDG4 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 THS3125CDG4 reliable?
The price and inventory of THS3125CDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3125CDG4 is usually 5 days.
3.What payment methods are accepted for THS3125CDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3125CDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3125CDG4?
THS3125CDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3125CDG4 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 THS3125CDG4?
For technical support, including THS3125CDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3125CDG4 requirements.
6.How does Aetrix verify that THS3125CDG4 is sourced from the original manufacturer or authorized distributors?
All THS3125CDG4 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 THS3125CDG4 meets industry standards.
7.What is the process for return or replacement of THS3125CDG4?
All THS3125CDG4 units undergo pre-shipment inspection (PSI). If there is an issue with THS3125CDG4, 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 THS3125CDG4 part is unused and in its original packaging.
Return procedure for THS3125CDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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