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Texas Instruments THS4120CDGK
- Part No.:
- THS4120CDGK
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
THS4120CDGK.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,118
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Product details
Overview
THS4120CDGK from Texas Instruments is a high-speed, fully differential-input/differential-output amplifier optimized for single-supply ADC driving 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 13.5 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 THS4120CDGK datasheet, THS4120CDGK pinout, THS4120CDGK application, or THS4120CDGK equivalent, key selection criteria include its power-down functionality, VOCM-controlled output common-mode level, balanced differential drive capability for SAR and pipeline ADCs, thermal performance in MSOP PowerPAD™ packaging, and compatibility with 3.3 V logic and reference interfaces.
Technical Context
The THS4120CDGK implements a true fully differential signal path-both inputs and outputs are differential-enabling inherent common-mode noise rejection and second-harmonic distortion cancellation. Its internal architecture supports precise VOCM control of output DC level, allowing seamless interfacing with ADCs requiring mid-rail referenced differential inputs.
It features a dedicated PD pin with defined enable/disable thresholds (≥1.4 V for on, ≤1.2 V for off), requiring an external 10-kΩ pullup resistor to VDD. The device is internally compensated for stability with resistive feedback but requires series output isolation (e.g., 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 accurate amplification of signals up to ~30 MHz fundamental with <0.1 dB gain flatness. |
| Slew Rate | 55 V/µs - supports full-scale transient response for 2 VPP differential outputs within 60 ns settling (0.1%). |
| Total Harmonic Distortion | –75 dB at 1 MHz, 2 VPP - ensures minimal spectral contamination in high-fidelity ADC front-ends. |
| Input Voltage Noise | 5.4 nV/√Hz at 10 kHz - preserves SNR in low-amplitude, wideband sensor or IF signal chains. |
| Power-Down Current | 120 µA - reduces system standby power by >99% while retaining fast 4.8 µs wake-up time. |
| Supply Voltage Range | 3.0 V to 3.5 V - compatible with standard 3.3 V LDO rails and eliminates need for dual supplies. |
| Common-Mode Input Range | 0.35 V to VDD – 0.1 V - accommodates ground-referenced or rail-splitter-based input sources. |
Pinout & Package
The THS4120CDGK 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 continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN− | Inverting input | Differential input node; requires matched impedance to VIN+ for optimal CMRR and harmonic cancellation. |
| 2: VOCM | Output common-mode control | Sets DC level of both outputs; bypass with 0.1 µF capacitor to suppress noise coupling into output stage. |
| 3: VDD | Positive supply | 3.3 V single supply input; requires local 6.8 µF + 0.1 µF decoupling per TI layout guidelines. |
| 4: VOUT+ | Positive differential output | Delivers inverted amplified signal relative to VOUT−; output impedance ~1 Ω (closed-loop). |
| 5: VIN+ | Non-inverting input | Differential input node; symmetrical routing critical to preserve balance and minimize second-harmonic distortion. |
| 6: PD | Power-down enable | Active-high digital control; requires external 10-kΩ pullup to VDD for default operation; drives low to enter low-power mode. |
| 7: GND | Analog ground | Reference for all internal circuitry; must connect directly to low-inductance analog ground plane. |
| 8: VOUT− | Negative differential output | Delivers non-inverted amplified signal relative to VOUT+; complements VOUT+ for true differential signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Enables 75 dB THD and balanced output rejection of coupled noise, eliminating need for external transformers in ADC interfaces. |
| Integrated VOCM pin | Allows precise setting of output common-mode voltage to match ADC input requirements without external level-shifting circuitry. |
| Power-down functionality | Reduces IDD from 13.5 mA to 120 µA with 4.8 µs turn-on delay-ideal for battery-powered or duty-cycled data acquisition systems. |
| Single-supply 3.3 V operation | Eliminates negative rail requirement and simplifies power architecture in portable, industrial, and communications equipment. |
| MSOP PowerPAD™ thermal package | Provides 54.2 °C/W junction-to-case thermal resistance, enabling reliable 385 mW power dissipation at TA = 25°C. |
Applications
| High-Speed Data Acquisition | Differential ADC Driver |
|---|---|
Use Scenario: Driving 12–16-bit SAR or pipeline ADCs sampling at ≥10 MSPS in test equipment and instrumentation. IC Role / Device Role / Timing Role: Differential signal conditioner that converts single-ended sensor or IF signals to matched, low-distortion differential outputs synchronized to ADC clock timing. Use Value: Delivers –75 dB THD at 1 MHz and 100 MHz bandwidth to preserve ENOB and SFDR in high-resolution digitization paths. |
Use Scenario: Interfacing with ADCs having differential input pairs and internal reference buffers (e.g., ADS8xx, ADS9xx families). IC Role / Device Role / Timing Role: Precision gain stage with VOCM-controlled output common-mode level aligned to ADC's internal VREF/2. Use Value: Eliminates external level-shifting components and maintains >64 dB CMRR across 10 MHz, reducing layout sensitivity and board area. |
| Communications Baseband | Portable Medical Imaging Front-End |
Use Scenario: Transmitting baseband I/Q signals in software-defined radio (SDR) transceivers before DAC or after ADC. IC Role / Device Role / Timing Role: High-linearity differential transmitter/receiver supporting complex modulation schemes with minimal intermodulation. Use Value: Achieves –75 dBc third IMD at 10 MHz and –69 dB SFDR, ensuring clean spectral purity for QAM and OFDM signal generation. |
Use Scenario: Conditioning low-amplitude ultrasound or ECG signals prior to digitization in handheld diagnostic devices. IC Role / Device Role / Timing Role: Low-noise, low-power differential driver operating from 3.3 V battery supply with selectable power-down during idle periods. Use Value: Combines 5.4 nV/√Hz noise density and 120 µA power-down current to maximize battery life without compromising signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4121CDGK | Lacks PD pin; higher quiescent current (13.5 mA typical); identical bandwidth, noise, and distortion specs. | Preferred where continuous operation is required and power cycling is unnecessary. | Select THS4121CDGK only if power-down functionality is not needed and PCB layout allows omission of PD pullup resistor. |
| THS4131CDGN | Higher bandwidth (150 MHz), faster slew rate (51 V/µs), lower noise (1.3 nV/√Hz), but requires ±2.5 V to ±15 V split supply or 5–30 V single supply. | Suitable for wider bandwidth or lower-noise applications where 3.3 V supply constraint does not apply. | Choose THS4131CDGN only when system supports ≥5 V supply and demands >100 MHz bandwidth or sub-2 nV/√Hz noise. |
Compared with THS4121CDGK, THS4120CDGK adds power-down control at no cost to AC performance; compared with THS4131CDGN, it trades bandwidth and noise for strict 3.3 V compatibility and lower supply complexity-making THS4120CDGK the optimal choice for cost-sensitive, battery-aware, 3.3 V ADC interface designs.
Availability
THS4120CDGK is available at Aetrix Electronics and suitable for high-speed data acquisition, precision ADC interfacing, and portable medical instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for THS4120CDGK 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 high-performance signal chain solutions, with decades of expertise in precision amplifiers and data converter interfaces.
The THS4120CDGK belongs to TI's high-speed differential I/O amplifier family, designed specifically for single-supply, low-distortion ADC driving in instrumentation, communications, and medical imaging systems.
FAQ
What is the function of the PD pin on the THS4120CDGK?
The PD (Power-Down) pin on the THS4120CDGK is an active-high digital control input that reduces quiescent current from 13.5 mA to 120 µA when driven low. It requires a 10-kΩ pullup resistor to VDD for normal operation. THS4120CDGK enters low-power mode when PD voltage falls below 1.2 V, with 4.8 µs turn-on delay to reach 50% of nominal supply current.
How does the VOCM pin affect THS4120CDGK output behavior?
The VOCM pin sets the common-mode DC voltage of both differential outputs (VOUT+ and VOUT−). When left unconnected, VOCM defaults to VDD/2 (1.65 V on 3.3 V supply), enabling direct interface with mid-rail referenced ADCs. THS4120CDGK maintains full AC performance across the specified VOCM range (0.35 V to VDD – 0.1 V), and TI recommends bypassing VOCM with a 0.1 µF capacitor for noise immunity.
Can THS4120CDGK drive capacitive loads directly?
No-THS4120CDGK must not drive capacitive loads >10 pF directly due to reduced phase margin causing instability. TI specifies adding a 20 Ω series resistor between each output and the load. For 50 Ω transmission lines, a 50 Ω series resistor provides both isolation and source termination. This requirement applies regardless of whether the load is an ADC input capacitor or PCB trace capacitance.
What is the recommended power supply decoupling for THS4120CDGK?
TI specifies a 6.8 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor on the VDD pin of THS4120CDGK, placed within 2.54 mm (0.1 inch) of the pin. The 0.1 µF capacitor must be dedicated per device; sharing is not recommended. Ground connections must route to a solid analog ground plane, and the thermal pad (PowerPAD™) must be soldered to a thermally conductive copper area for reliable thermal performance.
Is THS4120CDGK pin-compatible with THS4121CDGK?
Yes-THS4120CDGK and THS4121CDGK share identical 8-pin MSOP PowerPAD™ (DGK) packaging and pinout, including VIN−, VOCM, VDD, VOUT+, VIN+, GND, and VOUT−. The only functional difference is that THS4120CDGK includes a PD pin at position 6, whereas THS4121CDGK has NC (no connect) at that location. PCB layouts designed for THS4121CDGK can accommodate THS4120CDGK with minor schematic updates for the PD pullup.
THS4120CDGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- 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-VSSOP
THS4120CDGK FAQ
1.How can I place an order for THS4120CDGK through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4120CDGK 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 THS4120CDGK reliable?
The price and inventory of THS4120CDGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4120CDGK is usually 5 days.
3.What payment methods are accepted for THS4120CDGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4120CDGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4120CDGK?
THS4120CDGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4120CDGK 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 THS4120CDGK?
For technical support, including THS4120CDGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4120CDGK requirements.
6.How does Aetrix verify that THS4120CDGK is sourced from the original manufacturer or authorized distributors?
All THS4120CDGK 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 THS4120CDGK meets industry standards.
7.What is the process for return or replacement of THS4120CDGK?
All THS4120CDGK units undergo pre-shipment inspection (PSI). If there is an issue with THS4120CDGK, 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 THS4120CDGK part is unused and in its original packaging.
Return procedure for THS4120CDGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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