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Texas Instruments THS4121CDGKR
- Part No.:
- THS4121CDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
THS4121CDGKR.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,353
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Product details
Overview
THS4121CDGKR from Texas Instruments is a high-speed, fully differential-input/differential-output amplifier optimized for single-supply 3.3 V operation, delivering 100 MHz bandwidth, 55 V/µs slew rate, –75 dB THD at 1 MHz (2 VPP), 5.4 nV/√Hz input noise, and balanced output common-mode noise rejection. It serves as a precision ADC driver in data acquisition systems requiring wide dynamic range and low distortion.
For engineers reviewing the THS4121CDGKR datasheet, THS4121CDGKR pinout, THS4121CDGKR application, or THS4121CDGKR equivalent, key selection criteria include its VOCM-controlled output level shifting, MSOP PowerPAD™ thermal performance, differential-to-differential signal integrity, and compatibility with 3.3 V single-supply data converter interfaces without transformers.
Technical Context
The THS4121CDGKR implements a true fully differential signal path from input to output using TI's submicron CMOS process, enabling symmetrical gain paths that inherently cancel second-harmonic distortion and improve CMRR. Its internal architecture supports precise VOCM-based DC output level control independent of input common-mode voltage.
Unlike the THS4120, the THS4121 lacks a power-down (PD) pin-its pinout omits PD and substitutes NC-making it a fixed-operation, low-latency variant optimized for continuous high-fidelity signal conditioning. The device operates stably with 800 Ω differential load and requires matched external feedback resistors (e.g., 200 Ω) to maintain balance and maximize PSRR/CMRR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 100 MHz - Enables baseband signal conditioning up to Nyquist frequency of 50 MSPS ADCs without attenuation. |
| Slew Rate | 55 V/µs - Supports fast transient response for 2 VPP differential outputs with ≤60 ns 0.1% settling time. |
| Total Harmonic Distortion | –75 dB at 1 MHz (2 VPP) - Meets high-fidelity requirements for 16-bit+ ADC drivers in instrumentation. |
| Input Voltage Noise | 5.4 nV/√Hz at 10 kHz - Limits added noise floor in precision sensor front-ends and low-level analog chains. |
| Supply Voltage Range | 3.0–3.5 V single supply - Simplifies power design in 3.3 V systems; no split-rail or negative supply needed. |
| Common-Mode Input Range | 0.35 V to VDD – 0.1 V - Accommodates rail-to-rail input signals while maintaining linearity and distortion specs. |
| Quiescent Current | 13.5 mA typical - Balances speed and power for always-on high-performance analog signal paths. |
Pinout & Package
THS4121CDGKR is housed in an 8-pin MSOP PowerPAD™ package (DGK), featuring an exposed thermal pad on the underside for enhanced heat dissipation. The PowerPAD must be soldered to a thermally conductive PCB copper area to maintain junction temperature ≤125°C under full-load operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN− | Inverting input | Differential input node; paired with VIN+ to define VID = VIN+ − VIN−; requires matched external resistor network. |
| VOCM | Output common-mode control | Sets DC offset of both outputs (VOUT+ and VOUT−); bypass with 0.1 µF capacitor to suppress noise coupling. |
| VDD | Positive supply | Single 3.3 V supply input; decouple with 0.1 µF ceramic + 6.8 µF tantalum per TI layout guidelines. |
| VOUT+ | Positive differential output | Delivers inverted amplified signal relative to VOCM; forms differential pair with VOUT− for noise rejection. |
| VIN+ | Non-inverting input | Differential input node; symmetry with VIN− ensures balanced gain and harmonic cancellation. |
| NC | No connect | Unbonded pin; must remain unconnected-no routing or grounding permitted. |
| GND | Analog ground reference | Return path for supply and signal currents; tie to low-inductance ground plane beneath PowerPAD. |
| VOUT− | Negative differential output | Delivers non-inverted amplified signal relative to VOCM; complements VOUT+ for full differential swing. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Enables 2× dynamic range vs. single-ended amplifiers-e.g., delivers 2 VPP differential output to drive 1 VPP ADC inputs. |
| VOCM-controlled output level shifting | Allows precise alignment of differential output common-mode voltage to ADC reference (e.g., AVDD/2), eliminating level-shifting circuitry. |
| High CMRR (96 dB typical) | Rejects board-level noise coupled equally onto both inputs-critical in noisy industrial or motor-control environments. |
| Low 5.4 nV/√Hz input noise | Preserves SNR in front-end stages for high-resolution sensors (e.g., strain gauges, RTDs) before digitization. |
| MSOP PowerPAD™ thermal package | Reduces θJA to 260°C/W (DGK), enabling >385 mW power dissipation at 85°C ambient-supports sustained high-speed operation. |
Applications
| Instrumentation Data Acquisition | Medical Imaging Front-End |
|---|---|
Use Scenario: High-precision analog signal conditioning prior to 16-bit SAR or sigma-delta ADCs in portable multimeters and oscilloscope channels. IC Role / Device Role / Timing Role: Differential ADC driver providing gain, level shifting, and antialias filtering interface between sensor signal chain and ADC inputs. Use Value: –75 dB THD and 100 MHz bandwidth preserve signal fidelity across full ADC input range, enabling accurate measurement of fast transients and low-distortion sine waves. |
Use Scenario: Low-noise amplification of differential outputs from ultrasound transducer arrays before digitization in portable imaging systems. IC Role / Device Role / Timing Role: Signal integrity buffer and common-mode translator ensuring matched timing and amplitude between complementary ADC input paths. Use Value: 5.4 nV/√Hz input noise and balanced outputs minimize added noise and common-mode interference, directly improving image contrast resolution. |
| Communications Baseband Processing | Industrial PLC Analog I/O Modules |
Use Scenario: Transmit/receive signal conditioning in software-defined radio (SDR) baseband sections where I/Q channel matching is critical. IC Role / Device Role / Timing Role: Differential transmitter driver and receiver front-end amplifier maintaining phase/gain symmetry between I and Q paths. Use Value: Second-harmonic cancellation and >96 dB CMRR ensure <0.01° I/Q skew, reducing EVM in 16-QAM and higher-order modulation schemes. |
Use Scenario: Isolated analog input conditioning in programmable logic controller modules interfacing with 4–20 mA current loops and RTD sensors. IC Role / Device Role / Timing Role: Precision differential driver isolating field-side signals and scaling them to match ADC reference levels in harsh EMI environments. Use Value: 64–96 dB CMRR and ±1.75 V supply tolerance reject ground-loop noise and supply ripple, ensuring stable 12–16 bit measurement accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4131CDGNR | 150 MHz BW, 51 V/µs SR, 1.3 nV/√Hz noise, wider 5–30 V supply range | Better noise performance and higher bandwidth but requires ≥5 V supply; not drop-in for 3.3 V systems | Select THS4131CDGNR only when upgrading supply rails and needing lower noise in new designs. |
| THS4561IRGET | 1.8 GHz GBW, 3000 V/µs SR, 2.2 nV/√Hz, rail-to-rail output, 2.7–5.5 V supply | Higher speed and lower noise, but significantly higher quiescent current (25 mA) and cost; over-spec for most 3.3 V ADC driver use cases | Choose THS4561IRGET only for >100 MSPS sampling or RF sampling applications where THS4121CDGKR bandwidth is insufficient. |
Compared with THS4121CDGKR, THS4131CDGNR offers superior bandwidth and noise but mandates higher supply voltage, while THS4561IRGET delivers extreme speed at the expense of power and cost-making THS4121CDGKR the optimal balance of performance, 3.3 V compatibility, and thermal efficiency for mainstream precision ADC driving.
Availability
THS4121CDGKR is available at Aetrix Electronics and suitable for instrumentation data acquisition, medical imaging front-ends, and industrial PLC analog I/O modules requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for THS4121CDGKR 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-chain solutions.
The THS412x family was designed specifically as fully differential I/O amplifiers for high-fidelity ADC interface applications, emphasizing distortion cancellation, VOCM flexibility, and single-supply operation in compact packages.
FAQ
What is the function of the NC pin on the THS4121CDGKR?
The NC (No Connect) pin on the THS4121CDGKR is an unconnected, unbonded terminal-neither electrically nor thermally tied to internal circuitry. It must remain floating with no PCB trace, solder mask opening, or grounding. This distinguishes THS4121CDGKR from THS4120CDGKR, which uses this pin as a power-down (PD) control input.
Can THS4121CDGKR operate from a 3.3 V supply with full specified performance?
Yes, THS4121CDGKR is fully characterized and guaranteed for operation at VDD = 3.3 V (range: 3.0–3.5 V). All key specifications-including 100 MHz bandwidth, –75 dB THD at 1 MHz, and 55 V/µs slew rate-are validated under 3.3 V, 25°C, RL = 800 Ω conditions per the official SLOS319D datasheet.
How does the VOCM pin affect THS4121CDGKR output behavior?
The VOCM pin sets the common-mode DC voltage of both VOUT+ and VOUT− outputs. With VOCM tied to VDD/2 (1.65 V), outputs center at 1.65 V; applying 2.0 V shifts both outputs up by 0.35 V. VOCM has high bandwidth and must be bypassed with a 0.1 µF capacitor to prevent noise injection into the output common-mode level.
Is THS4121CDGKR compatible with standard MSOP footprints without PowerPAD modification?
No-THS4121CDGKR uses the DGK package variant with an exposed thermal pad (PowerPAD™) on the underside. Standard MSOP land patterns omit the thermal pad and associated solder stencil aperture. Using a non-PowerPAD footprint risks thermal overload, exceeding 125°C junction temperature, and premature failure under continuous operation.
What is the minimum recommended load resistance for THS4121CDGKR differential outputs?
The THS4121CDGKR is characterized with RL = 800 Ω differential (i.e., 400 Ω per output to VOCM). Driving loads below 400 Ω per side increases distortion and may degrade settling time. For capacitive loads >10 pF, TI recommends adding a 20 Ω series resistor per output to maintain stability and phase margin.
THS4121CDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 55V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 100 MHz
- Current - Input Bias:
- 1.2 pA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 11mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 3.5 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
THS4121CDGKR FAQ
1.How can I place an order for THS4121CDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4121CDGKR 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 THS4121CDGKR reliable?
The price and inventory of THS4121CDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4121CDGKR is usually 5 days.
3.What payment methods are accepted for THS4121CDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4121CDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4121CDGKR?
THS4121CDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4121CDGKR 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 THS4121CDGKR?
For technical support, including THS4121CDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4121CDGKR requirements.
6.How does Aetrix verify that THS4121CDGKR is sourced from the original manufacturer or authorized distributors?
All THS4121CDGKR 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 THS4121CDGKR meets industry standards.
7.What is the process for return or replacement of THS4121CDGKR?
All THS4121CDGKR units undergo pre-shipment inspection (PSI). If there is an issue with THS4121CDGKR, 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 THS4121CDGKR part is unused and in its original packaging.
Return procedure for THS4121CDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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