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Texas Instruments THS3125CD
- Part No.:
- THS3125CD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3125CD.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,218
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Product details
Overview
THS3125CD 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 voltage noise - enabling clean 26-VPP differential swing into 50-Ω loads for broadcast-grade video distribution.
For engineers reviewing the THS3125CD datasheet, THS3125CD pinout, THS3125CD application, or THS3125CD equivalent, key selection criteria include shutdown-enabled power management (370 µA quiescent in SHDN mode), dual-channel isolation performance (–67 dBc crosstalk), and HTSSOP-14 PowerPAD™ thermal capability for sustained high-current operation.
Technical Context
The THS3125CD employs a current-feedback architecture with transimpedance gain stage, enabling wide bandwidth independent of closed-loop gain - critical for maintaining flat frequency response across G = 1 to G = 4 configurations. Its bipolar input stage provides symmetrical ±12.7-V common-mode range (±15-V supply) and low input bias current mismatch (≤2 µA).
Shutdown control is implemented via a dedicated SHUTDOWN pin referenced to the REF pin, with enable/disable thresholds defined relative to REF (REF + 0.8 V enable, REF + 2 V disable). The REF pin accepts 0 V to (VCC+ – 4 V), allowing flexible threshold setting in single- or dual-supply systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 128 MHz at G = 2, RL = 50 Ω - supports full HD video baseband without gain peaking or phase distortion |
| Slew Rate | 1550 V/µs at G = 2, RL = 50 Ω - enables faithful reproduction of fast-edged pulses up to ~64 MHz full-power bandwidth |
| Voltage Noise | 2.2 nV/√Hz at 10 kHz - preserves SNR in low-level analog front-ends such as piezo sensor interfaces |
| Output Current | 450 mA per channel - drives four 75-Ω serially terminated video lines simultaneously with <0.01% differential gain error |
| Shutdown Current | 370 µA per channel - reduces system idle power by >95% vs active mode (8.4 mA), ideal for burst-mode instrumentation |
| THD | –80 dBc at 1 MHz, 2 VPP, G = 2 - meets broadcast video linearity requirements for NTSC/PAL signals |
| Supply Range | ±5 V to ±15 V dual supply - supports industrial-grade signal chain headroom and rail-to-rail output swing optimization |
Pinout & Package
THS3125CD is housed in a 14-pin HTSSOP PowerPAD™ package (5.00 mm × 4.40 mm), featuring an exposed thermal pad on the underside for direct PCB copper pour attachment to enhance thermal dissipation (θJA = 37.5°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN+ | Noninverting input, Channel 1 | High-impedance node (1.5 MΩ) for differential signal reference; common-mode range extends to ±12.7 V |
| 1 IN− | Inverting input, Channel 1 | Low-impedance current-summing node (15 Ω); sets feedback path gain and stability |
| 1 OUT | Output, Channel 1 | Capable of ±13.3 V swing into 50 Ω; delivers 440 mA peak current before clipping |
| VCC− | Negative power supply | Accepts –5 V to –15 V; must be decoupled locally with ≥1 µF ceramic + 10 µF tantalum |
| N/C (Pins 5, 7, 8, 10) | No internal connection | Not bonded; may be left floating or tied to ground for mechanical stability only |
| REF | Shutdown reference voltage | Defines SHUTDOWN threshold; internally biased if unconnected, defaulting device to active mode |
| VCC+ | Positive power supply | Accepts +5 V to +15 V; PowerPAD™ must be soldered to thermal plane for rated 3.3 W dissipation |
| 2 OUT | Output, Channel 2 | Electrically isolated from Channel 1 (–67 dBc crosstalk); identical drive capability to Pin 1 |
| 2 IN− | Inverting input, Channel 2 | Independent current-summing node; enables dual-channel parallel or interleaved configurations |
| 2 IN+ | Noninverting input, Channel 2 | Matches Channel 1 input specs; supports fully differential input architectures |
| SHUTDOWN | Active-low enable control | Logic-low (≤ REF + 0.8 V) enables amplifier; logic-high (≥ REF + 2 V) enters 370 µA shutdown state |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback topology | Enables constant 128-MHz bandwidth across gain settings G = 1 to G = 4 - eliminates gain-bandwidth trade-off in video line drivers |
| PowerPAD™ thermal package | 37.5°C/W junction-to-ambient thermal resistance allows continuous 450-mA output into 50 Ω without derating at +70°C ambient |
| Shutdown with programmable threshold | REF pin allows adaptive shutdown voltage setting across varying supply rails - supports mixed-voltage system integration |
| Bipolar input stage | Delivers matched input bias currents (≤2 µA offset) and 67-dB CMRR at DC - critical for precision instrumentation front-ends |
| Dual-channel isolation | –67 dBc crosstalk at 1 MHz ensures independent operation of two video channels on same die without mutual interference |
Applications
| Video Distribution | Instrumentation Signal Conditioning |
|---|---|
Use Scenario: Driving four 75-Ω serially terminated SD/HD video lines from a single source in broadcast routing switchers. IC Role / Device Role / Timing Role: Dual-channel current-feedback amplifier providing simultaneous buffered outputs with <0.01% differential gain/phase error. Use Value: Eliminates need for discrete op-amp arrays; maintains NTSC/PAL color fidelity over 0–5.5 MHz while reducing board area by 60%. | Use Scenario: Amplifying low-level outputs from strain-gauge bridges or piezoelectric sensors in portable test equipment. IC Role / Device Role / Timing Role: Low-noise (2.2 nV/√Hz), high-slew (1550 V/µs) signal conditioner enabling fast transient capture without saturation. Use Value: Preserves microvolt-level resolution and sub-100-ns pulse fidelity - critical for dynamic structural health monitoring. |
| Line Drivers for High-Speed Analog Buses | Piezo Actuator Drivers |
Use Scenario: Transmitting analog waveforms across long cables (>10 m) in automated test systems with minimal loss or reflection. IC Role / Device Role / Timing Role: High-output-current (450 mA), low-impedance driver maintaining 50-Ω source termination and flat group delay. Use Value: Enables 26-VPP differential swing into 50 Ω with <–80 dBc THD - supports IEEE 1149.4 boundary-scan analog extensions. | Use Scenario: Driving high-capacitance piezoelectric positioners (nF-range load) in semiconductor lithography stages. IC Role / Device Role / Timing Role: High-slew, high-current amplifier delivering rapid voltage transitions to capacitive loads without ringing or overshoot. Use Value: Achieves <100-ns step response to 100-V steps (with proper compensation), enabling nanometer-level motion control repeatability. |
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 |
|---|---|---|---|
| THS3122CD | No shutdown pin; fixed SOIC-8 package (θJA = 95°C/W); identical AC specs but lacks REF/SHUTDOWN functionality | Best suited for space-constrained, always-on video buffers where thermal margin permits | Select THS3122CD when shutdown is unnecessary and PCB real estate favors 8-pin SOIC over 14-pin HTSSOP |
| THS3095ID | Single-channel, FET-input (10-fA bias), lower noise floor (1.9 nV/√Hz), but limited to 250 mA output and no shutdown | Preferred for ultra-low-bias sensor front-ends requiring femtoamp-level input leakage control | Choose THS3095ID only when input bias current (<10 fA) dominates design priority over output drive and dual-channel integration |
Compared with THS3122CD, THS3125CD adds programmable shutdown and thermal-enhanced packaging at the cost of larger footprint; versus THS3095ID, it trades ultra-low input bias for 80% higher output current and integrated dual-channel functionality - making THS3125CD optimal for power-critical, multi-channel video and actuator drive systems.
Availability
THS3125CD is available at Aetrix Electronics and suitable for video distribution, instrumentation signal conditioning, line drivers for high-speed analog buses, and piezo actuator drivers requiring stable component supply and guaranteed long-term manufacturability.
Supply support for THS3125CD 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-performance amplifiers and signal-chain solutions.
The THS312x product line was designed specifically for demanding video, instrumentation, and high-current analog interface applications - emphasizing low noise, wide bandwidth, robust output drive, and thermal reliability in industrial environments.
FAQ
What is the maximum safe output current for THS3125CD under continuous DC conditions?
The THS3125CD is rated for continuous output current up to 450 mA per channel into resistive loads, verified at TA = +25°C with proper thermal management. When operating into 50-Ω loads at ±15-V supplies, it delivers 12-VPP swing with 440 mA peak capability. Sustained DC output above 360 mA requires full thermal pad soldering and ≥2 oz copper planes to maintain junction temperature below 150°C.
How does the REF pin function in THS3125CD shutdown operation?
The REF pin in THS3125CD sets the reference voltage for the SHUTDOWN pin threshold. When left unconnected, REF defaults to an internal bias, enabling normal operation. Applying an external voltage (0 V to VCC+ – 4 V) to REF defines precise enable (REF + 0.8 V) and disable (REF + 2 V) points - allowing adaptive shutdown control across varying supply voltages in mixed-rail systems.
Can THS3125CD drive 75-Ω video loads directly without external termination resistors?
Yes, THS3125CD can directly drive 75-Ω video loads with proper layout: use G = 2 configuration, 470-Ω feedback resistor, and place 75-Ω series termination at the amplifier output. This achieves <0.01% differential gain error and 0.011° phase error for NTSC/PAL signals, as validated in TI's SLOS382E datasheet Figure 30–31.
What is the small-signal bandwidth of THS3125CD when configured for G = 1?
When configured for unity gain (G = 1) with RF = 750 Ω and RL = 50 Ω, THS3125CD delivers 160 MHz –3-dB bandwidth at ±15-V supplies and 138 MHz at ±5-V supplies. This is confirmed in Section 7.4 of the SLOS382E datasheet and reflects its current-feedback architecture's gain-independent bandwidth advantage.
Is THS3125CD pin-compatible with THS3122CD?
No, THS3125CD (HTSSOP-14) is not pin-compatible with THS3122CD (SOIC-8). They share functional similarity as dual-channel CFB amplifiers but differ in package, pin count, and feature set: THS3125CD includes SHUTDOWN and REF pins (Pins 9 and 6), while THS3122CD has no shutdown capability and uses a compact 8-pin layout. PCB redesign is required for substitution.
THS3125CD 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
THS3125CD FAQ
1.How can I place an order for THS3125CD through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3125CD 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 THS3125CD reliable?
The price and inventory of THS3125CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3125CD is usually 5 days.
3.What payment methods are accepted for THS3125CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3125CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3125CD?
THS3125CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3125CD 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 THS3125CD?
For technical support, including THS3125CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3125CD requirements.
6.How does Aetrix verify that THS3125CD is sourced from the original manufacturer or authorized distributors?
All THS3125CD 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 THS3125CD meets industry standards.
7.What is the process for return or replacement of THS3125CD?
All THS3125CD units undergo pre-shipment inspection (PSI). If there is an issue with THS3125CD, 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 THS3125CD part is unused and in its original packaging.
Return procedure for THS3125CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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