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Texas Instruments THS4120CDR
- Part No.:
- THS4120CDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4120CDR.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,671
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Product details
Overview
THS4120CDR from Texas Instruments is a high-speed, fully differential-input/differential-output amplifier optimized for single-supply ADC driver applications. It delivers 100 MHz –3 dB bandwidth, 55 V/µs slew rate, –75 dB THD at 1 MHz (2 VPP), 5.4 nV/√Hz input-referred voltage noise, and features an integrated power-down pin (PD) enabling quiescent current reduction from 11 mA to 120 µA. It operates from a 3.3 V single supply and supports differential signal conditioning in precision data acquisition systems.
For engineers reviewing the THS4120CDR datasheet, THS4120CDR pinout, THS4120CDR application, or THS4120CDR equivalent, this page provides verified circuit role, validated package mapping (SOIC-8), confirmed power-down behavior, real-world distortion/noise performance at 1 MHz and 10 kHz, and two rigorously cross-checked alternative options for differential ADC driver designs requiring low THD and rail-to-rail output swing.
Technical Context
The THS4120CDR implements a true fully differential signal path with symmetrical input and output stages, enabling balanced common-mode noise rejection and second-harmonic cancellation. Its internal architecture supports both differential-input/differential-output and single-ended-input/differential-output configurations without external level-shifting components.
It integrates a dedicated VOCM pin for precise output common-mode control-internally biased to VDD/2-and a digital-compatible PD pin requiring a 10-kΩ pullup to VDD for reliable enable/disable operation. The device is internally compensated for maximum bandwidth but requires series output resistance (≥20 Ω) when driving >10 pF capacitive loads to maintain phase margin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| –3 dB Bandwidth | 100 MHz - enables baseband signal conditioning up to Nyquist frequency of 50 MSPS ADCs |
| Slew Rate | 55 V/µs - supports fast settling of large-signal transients in high-resolution sampling systems |
| Total Harmonic Distortion | –75 dB at 1 MHz, 2 VPP - meets SFDR requirements for 14-bit+ ADC drivers in communication receivers |
| Input Voltage Noise | 5.4 nV/√Hz at 10 kHz - preserves SNR in low-frequency sensor front-ends and precision instrumentation |
| Power-Down Current | 120 µA - reduces system standby power by >98% while retaining fast 4.8 µs wake-up for burst-mode operation |
| Supply Voltage Range | 3.0 V to 3.5 V (typ. 3.3 V) - compatible with modern low-voltage digital I/O domains and LDO-regulated ADC supplies |
| Common-Mode Input Range | 0.35 V to VDD – 0.1 V - accommodates DC-coupled inputs from op-amp buffers or DAC outputs |
Pinout & Package
THS4120CDR is supplied in an 8-pin SOIC (D) package with exposed thermal pad (PowerPAD™), rated for 0°C to 70°C operation. Thermal pad must be soldered to PCB copper pour for reliable junction temperature control below 125°C under full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN− | Inverting input | Differential input node; matched impedance critical for CMRR and harmonic cancellation |
| VOCM | Output common-mode control | DC bias reference for output swing centering; bypass with 0.1 µF capacitor for noise immunity |
| VDD | Positive supply | Single 3.3 V rail; requires local 0.1 µF ceramic + 6.8 µF tantalum decoupling |
| VOUT+ | Positive differential output | Complementary output; drives one leg of differential ADC input or transmission line |
| VIN+ | Non-inverting input | Differential input node; symmetry with VIN− essential for balanced gain and distortion performance |
| PD | Power-down enable | Active-high logic input; requires 10-kΩ pullup to VDD; disables amplifier core while preserving bias integrity |
| GND | Analog ground | Low-inductance return path; isolated from digital ground to prevent noise coupling into differential path |
| VOUT− | Negative differential output | Complementary output; equal amplitude, opposite polarity to VOUT+ for true differential signaling |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply differential ADC driver | Operates from 3.3 V with VOCM internally set to VDD/2-eliminates need for external level shifters in data converter interfaces |
| Power-down mode | Reduces IDD from 11 mA to 120 µA via PD pin-enables dynamic power scaling in battery-powered or thermally constrained systems |
| Balanced output structure | Rejects common-mode noise on both outputs simultaneously-improves EMI immunity in mixed-signal PCB layouts |
| Second-harmonic cancellation | Symmetrical differential output inherently suppresses even-order distortion-critical for high-fidelity IF/RF sampling |
| Thermally enhanced SOIC | PowerPAD™ package lowers θJA to 97.5°C/W-supports 1.02 W continuous dissipation at 25°C ambient with proper PCB copper area |
Applications
| High-Speed Data Acquisition | Digital Communications Receiver |
|---|---|
|
Use Scenario: Driving the differential input of a 14-bit, 100 MSPS pipeline ADC in a software-defined radio front-end. IC Role / Device Role / Timing Role: Fully differential ADC driver providing gain = 1, 2 VPP output swing, and <60 ns 0.1% settling time. Use Value: Enables direct coupling from analog filters to ADC without transformers or level shifters, preserving SNR and reducing BOM count. |
Use Scenario: Conditioning intermediate-frequency (IF) signals before digitization in LTE/FDD base station receivers. IC Role / Device Role / Timing Role: Differential transmitter stage converting single-ended IF output from mixer to balanced signal for ADC input. Use Value: Achieves –75 dB THD at 1 MHz and –69 dB SFDR-meeting spectral purity requirements for adjacent-channel leakage ratio (ACLR). |
| Industrial Sensor Signal Chain | Medical Imaging Front-End |
|
Use Scenario: Amplifying low-level bridge sensor outputs (e.g., strain gauge, pressure transducer) prior to sigma-delta ADC conversion. IC Role / Device Role / Timing Role: Precision differential gain stage with VOCM referenced to ADC's internal VREF for optimal dynamic range utilization. Use Value: 5.4 nV/√Hz input noise and 75 dB CMRR ensure sub-µV resolution in 24-bit measurement systems. |
Use Scenario: Driving differential inputs of high-speed ADCs in ultrasound beamforming modules requiring low-latency analog signal paths. IC Role / Device Role / Timing Role: Low-distortion, fast-settling buffer between programmable gain amplifier (PGA) and ADC sampling clock domain. Use Value: 4.8 µs power-on delay and 120 µA shutdown current support synchronized power gating across multi-channel receive paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4131CDGN | Higher 150 MHz bandwidth, 51 V/µs slew rate, 1.3 nV/√Hz noise; no PD pin; requires ±2.5 V to ±15 V supply | Preferred for wideband IF sampling (>100 MHz) where ultra-low noise dominates over power-down capability | Select THS4131CDGN only if dual-supply infrastructure exists and power-down is unnecessary |
| THS4561IRGET | 1.2 GHz GBW, 1500 V/µs slew rate, 2.2 nV/√Hz noise; integrated VOCM buffer; 3.3 V single supply; no PD pin | Targeted at RF sampling ADCs (e.g., 12-bit, 2.5 GSPS) where bandwidth and speed outweigh low-power needs | Choose THS4561IRGET for >500 MHz signal chains; THS4120CDR remains optimal for cost-sensitive, power-aware 100 MSPS systems |
Compared with THS4131CDGN and THS4561IRGET, THS4120CDR uniquely balances 100 MHz bandwidth, –75 dB THD, and active power-down in a 3.3 V SOIC package-making it the only option among the three that supports energy-efficient, medium-bandwidth ADC driver applications without supply rail changes or layout redesign.
Availability
THS4120CDR is available at Aetrix Electronics and suitable for high-speed data acquisition, communications receiver design, and industrial sensor interface applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for THS4120CDR 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 data converter interface solutions.
The THS412x family was designed specifically for precision, low-distortion differential signal conditioning in single-supply data acquisition systems-emphasizing THD, noise, and power-down efficiency over raw bandwidth.
FAQ
What is the function of the PD pin on the THS4120CDR?
The PD (Power-Down) pin on the THS4120CDR is an active-high enable input that reduces quiescent current from 11 mA to 120 µA when driven low. For reliable operation, a 10-kΩ pullup resistor must connect PD to VDD. THS4120CDR does not enter high-impedance output state during power-down-the feedback network maintains closed-loop output impedance.
Can the THS4120CDR drive a 50 Ω transmission line directly?
No, the THS4120CDR should not drive a 50 Ω load directly. To avoid instability and ringing, a minimum 20 Ω series resistor must be placed between each output (VOUT+, VOUT−) and the transmission line. For 50 Ω systems, using 50 Ω series resistors provides both source termination and capacitive load isolation, as specified in the THS4120CDR application notes.
What is the recommended bypassing for the VOCM pin on the THS4120CDR?
The VOCM pin on the THS4120CDR must be bypassed with a 0.1 µF ceramic capacitor to ground, placed as close as possible to the pin. This prevents noise coupling into the output common-mode reference and ensures stability across frequency. No additional RC filtering is required unless system-level noise exceeds 10 mVpp at the VOCM node.
Does the THS4120CDR support split-supply operation?
No, the THS4120CDR is specified only for single-supply operation at 3.3 V (range: 3.0 V to 3.5 V). It is not characterized or guaranteed for split-supply use. For ±2.5 V to ±15 V applications, TI recommends the THS4131 or THS4141 families instead-these are explicitly rated for dual supplies and lack the THS4120CDR's integrated power-down feature.
How does the THS4120CDR achieve improved harmonic distortion performance?
The THS4120CDR achieves –75 dB THD at 1 MHz through its fully symmetrical differential topology: matched input and output stages cause second-harmonic components to cancel at the differential output node. This inherent cancellation-combined with submicron CMOS process optimization-delivers lower distortion than conventional single-ended amplifiers without requiring external trimming or calibration. THS4120CDR's balanced architecture is fundamental to its performance claim.
THS4120CDR 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:
- 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-SOIC
THS4120CDR FAQ
1.How can I place an order for THS4120CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4120CDR 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 THS4120CDR reliable?
The price and inventory of THS4120CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4120CDR is usually 5 days.
3.What payment methods are accepted for THS4120CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4120CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4120CDR?
THS4120CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4120CDR 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 THS4120CDR?
For technical support, including THS4120CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4120CDR requirements.
6.How does Aetrix verify that THS4120CDR is sourced from the original manufacturer or authorized distributors?
All THS4120CDR 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 THS4120CDR meets industry standards.
7.What is the process for return or replacement of THS4120CDR?
All THS4120CDR units undergo pre-shipment inspection (PSI). If there is an issue with THS4120CDR, 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 THS4120CDR part is unused and in its original packaging.
Return procedure for THS4120CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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