My Inquiry
My Account
Texas Instruments THS3122CD
- Part No.:
- THS3122CD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3122CD.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:893
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
THS3122CD 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 serially terminated video distribution.
For engineers reviewing the THS3122CD datasheet, THS3122CD pinout, THS3122CD application, or THS3122CD equivalent, key selection criteria include its SOIC-8 package, ±5-V to ±15-V dual-supply operation, shutdown-incompatible design (no SHUTDOWN/REF pins), and suitability for wideband line drivers requiring >400-mA peak current and <0.01% differential gain error.
Technical Context
The THS3122CD implements a current feedback architecture with high-impedance noninverting inputs and low-impedance inverting inputs, enabling stable gain-setting via feedback resistor networks independent of closed-loop gain. Its transimpedance open-loop gain exceeds 1 MΩ, supporting fast settling (64 ns to 0.1%) and wide small-signal bandwidth (up to 160 MHz at ±15 V).
Designed for heavy capacitive and resistive loads, it maintains –80-dBc THD at 1 MHz (2 VPP, G = 2) and achieves 0.01% differential gain/0.011° differential phase error in NTSC/PAL video systems with 75-Ω serial termination - confirming its role as a precision wideband driver rather than a general-purpose op amp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 128 MHz @ RL = 50 Ω, RF = 470 Ω, G = 2, ±15 V - supports full HD video baseband and fast pulse amplification |
| Slew Rate | 1550 V/µs @ G = 2, RL = 50 Ω - enables clean 20-VPP large-signal step response without slewing distortion |
| Voltage Noise | 2.2 nV/√Hz @ 10 kHz - ensures minimal contribution to system SNR in low-level signal paths |
| Output Current | ±450 mA peak - drives four 75-Ω video lines simultaneously or powers piezo actuators directly |
| Supply Range | ±5 V to ±15 V - compatible with legacy analog test equipment and industrial ±12-V rails |
| THD | –80 dBc @ 1 MHz, 2 VPP, G = 2 - meets broadcast-grade video distortion requirements |
| Differential Gain Error | 0.01% @ NTSC/PAL, 75-Ω load - eliminates color fidelity loss in video distribution systems |
Pinout & Package
THS3122CD is housed in an 8-pin SOIC (D) package (4.90 mm × 3.91 mm) with exposed PowerPAD thermal pad on underside - requires PCB copper pour connection for thermal management per TI SLMA002 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN+ | Noninverting input, Channel 1 | High-impedance node for signal reference; sets input common-mode range (±2.5 V to ±12.7 V) |
| 1 IN− | Inverting input, Channel 1 | Low-impedance current-summing node; defines gain via external RF resistor |
| 1 OUT | Output, Channel 1 | Capable of ±450 mA sink/source into 50-Ω loads; 26-VPP swing achievable |
| VCC− | Negative supply rail | Connects to –5 V to –15 V; must be decoupled locally with ≥0.1 µF ceramic capacitor |
| VCC+ | Positive supply rail | Connects to +5 V to +15 V; shares same decoupling requirement as VCC− |
| 2 OUT | Output, Channel 2 | Independent output stage; supports simultaneous dual-channel video or differential driver use |
| 2 IN− | Inverting input, Channel 2 | Separate current-summing node; allows independent gain configuration per channel |
| 2 IN+ | Noninverting input, Channel 2 | Independent high-Z input; enables true dual-channel operation without crosstalk degradation |
Key Features
| Feature | Design Value |
|---|---|
| Current feedback topology | Enables constant bandwidth across gain settings - unlike voltage-feedback op amps where BW drops with gain |
| 450-mA output drive | Eliminates need for external buffer stages when driving 50-Ω transmission lines or reactive piezo loads |
| 2.2-nV/√Hz input voltage noise | Preserves signal integrity in low-amplitude, wideband applications such as medical imaging front-ends |
| 0.01% differential gain error | Meets SMPTE RP 168 compliance for professional video routing without post-correction circuitry |
| 1550-V/µs slew rate | Supports <10-ns rise times in pulse amplification for laser diode or ultrasound transmit circuits |
Applications
| Video Distribution | Instrumentation Signal Conditioning |
|---|---|
Use Scenario: Distributing composite NTSC/PAL video signals to multiple monitors or recording devices over 75-Ω coaxial cables. IC Role / Device Role / Timing Role: Dual-channel current feedback amplifier configured as unity-gain buffer with serial 75-Ω termination. Use Value: Achieves 0.01% differential gain and 0.011° differential phase error - preserving color fidelity without calibration. | Use Scenario: Amplifying low-level sensor outputs (e.g., strain gauges, photodiodes) before ADC sampling in automated test equipment. IC Role / Device Role / Timing Role: High-speed, low-noise gain stage operating at ±15 V with 128-MHz bandwidth. Use Value: 2.2-nV/√Hz voltage noise and –80-dBc THD ensure measurement accuracy up to 10 MHz. |
| High-Current Line Drivers | Piezo Actuator Drivers |
Use Scenario: Driving long 50-Ω twisted-pair or coaxial lines in industrial communication or radar pulse distribution. IC Role / Device Role / Timing Role: Wideband current source delivering ±450 mA into matched impedance loads. Use Value: Sustains 26-VPP differential swing at 100 MHz - avoids signal attenuation and reflection-induced distortion. | Use Scenario: Generating high-voltage, fast-rising waveforms to control piezoelectric transducers in ultrasonic cleaning or precision positioning. IC Role / Device Role / Timing Role: High-slew-rate voltage driver with reactive load compensation capability. Use Value: 1550-V/µs slew rate enables sub-microsecond step response; 450-mA peak current charges piezo capacitance rapidly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3122ID | Same electrical specs but rated for –40°C to +85°C industrial temperature range; identical SOIC-8 package | Required for automotive under-hood or outdoor industrial deployments where ambient exceeds +70°C | Select THS3122ID when extended temperature operation is mandatory; otherwise THS3122CD suffices for commercial environments |
| THS3125CD | Includes SHUTDOWN and REF pins; adds 370-µA shutdown mode; otherwise identical AC performance and pinout (SOIC-14) | Used where dynamic power gating is needed - e.g., portable test gear or battery-powered instrumentation | Choose THS3125CD only if active power-down functionality is required; THS3122CD has no shutdown logic and uses simpler 8-pin layout |
Compared with THS3122ID, THS3122CD trades extended temperature tolerance for lower cost and standard commercial qualification; compared with THS3125CD, it omits shutdown circuitry to reduce pin count and simplify PCB layout - making THS3122CD optimal for fixed-function, always-on video and instrumentation drivers.
Availability
THS3122CD is available at Aetrix Electronics and suitable for video distribution, instrumentation signal conditioning, and high-current line driving applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for THS3122CD 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, embedded processing, and connectivity technologies for industrial, automotive, and communications markets.
The THS3122CD belongs to TI's THS312x family of high-speed current feedback amplifiers, engineered specifically for wideband, high-output-current applications including broadcast video, test equipment, and precision motion control.
FAQ
What is the maximum output current capability of the THS3122CD?
The THS3122CD delivers ±450 mA of continuous output current per channel, verified under recommended operating conditions (±15 V supplies, RL = 25 Ω). This enables direct driving of 50-Ω video lines, piezo elements, or other heavy reactive loads without external buffering. Absolute maximum rating is ±550 mA, but sustained operation above ±450 mA may exceed thermal limits unless PCB thermal design complies with TI SLMA002 PowerPAD guidelines. THS3122CD maintains this current while preserving –80-dBc THD at 1 MHz.
Does the THS3122CD support shutdown functionality?
No, the THS3122CD does not include shutdown capability. Unlike the pin-compatible THS3125CD (which features SHUTDOWN and REF pins in a 14-pin SOIC package), the THS3122CD is an 8-pin device with no dedicated control pins for power-down. Its quiescent current remains fixed at 7.2–10.5 mA per channel across the full ±5-V to ±15-V supply range. Therefore, THS3122CD is intended for always-on applications such as video distribution infrastructure or benchtop instrumentation where standby power savings are not required.
What package type is used for the THS3122CD?
The THS3122CD is supplied in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, featuring an exposed thermal pad (PowerPAD) on the underside. This pad must be soldered to a PCB copper pour for effective heat dissipation - failure to do so risks exceeding the 150°C maximum junction temperature. Thermal resistance θJA is 95°C/W on JEDEC high-K test board; actual performance depends on PCB layout. No HSOP or HTSSOP variants exist for the THS3122CD - only the SOIC-8 variant is orderable under this part number.
Can the THS3122CD drive 50-Ω loads with low distortion?
Yes, the THS3122CD is explicitly characterized to drive 50-Ω loads with low distortion: it achieves –80-dBc THD at 1 MHz (2 VPP, G = 2) and sustains 26-VPP differential output swing into 50 Ω at ±15 V supplies. Its current feedback architecture and 450-mA output capability prevent clipping and maintain linearity even under heavy transient loading. Data sheet Figure 30 confirms 0.01% differential gain error with 75-Ω serial termination - validating its suitability for broadcast video and high-fidelity signal routing where impedance matching and distortion control are critical. THS3122CD performance holds across the full 0°C to +70°C commercial temperature range.
What is the input voltage noise specification for the THS3122CD?
The THS3122CD exhibits 2.2 nV/√Hz input voltage noise at 10 kHz under ±5 V and ±15 V supplies - a key parameter confirmed in Section 7.5 of the official datasheet (SLOS382E). This low noise floor, combined with 2.9-pA/√Hz noninverting current noise and 10.8-pA/√Hz inverting current noise, makes THS3122CD suitable for wideband, low-amplitude signal amplification where SNR preservation is essential. The voltage noise remains flat across 1 kHz–100 MHz, ensuring consistent performance in both baseband and IF applications. THS3122CD's noise profile is measured with the device biased per recommended operating conditions and is not dependent on gain configuration.
THS3122CD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 8-SOIC
THS3122CD FAQ
1.How can I place an order for THS3122CD through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3122CD 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 THS3122CD reliable?
The price and inventory of THS3122CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3122CD is usually 5 days.
3.What payment methods are accepted for THS3122CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3122CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3122CD?
THS3122CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3122CD 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 THS3122CD?
For technical support, including THS3122CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3122CD requirements.
6.How does Aetrix verify that THS3122CD is sourced from the original manufacturer or authorized distributors?
All THS3122CD 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 THS3122CD meets industry standards.
7.What is the process for return or replacement of THS3122CD?
All THS3122CD units undergo pre-shipment inspection (PSI). If there is an issue with THS3122CD, 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 THS3122CD part is unused and in its original packaging.
Return procedure for THS3122CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
THS3122CD Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
