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Texas Instruments THS4140CD
- Part No.:
- THS4140CD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4140CD.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:161
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Product details
Overview
THS4140CD from Texas Instruments is a high-speed fully differential amplifier designed for precision signal conditioning in ADC driver, antialiasing, and differential transmitter/receiver applications. It delivers 160 MHz –3 dB bandwidth (±15 V supply), 450 V/µs slew rate, –79 dB third-harmonic distortion at 1 MHz, 6.5 nV/√Hz input noise, and features active shutdown with 880 µA quiescent current in SD mode.
For engineers reviewing the THS4140CD datasheet, THS4140CD pinout, THS4140CD application, or THS4140CD equivalent, key selection criteria include differential output swing (±12.9 V at ±15 V), VOCM-controlled common-mode level shifting, PD pin shutdown control, and MSOP PowerPAD™ thermal performance requirements for high-fidelity analog front-ends.
Technical Context
The THS4140CD implements a true fully differential signal path-differential input to differential output-enabling balanced noise rejection, reduced second-harmonic distortion via output symmetry, and improved CMRR (84 dB typical) and PSRR (70 dB dc). Its BiComI bipolar process supports wide supply range (±2.5 V to ±15 V or 5 V single supply) and stable operation into 800 Ω differential loads.
Unlike conventional op-amps, it uses VOCM to set output common-mode voltage independently of gain configuration, and its PD pin provides active-low shutdown with >1 MΩ output impedance in sleep state-critical for power-gated data acquisition systems requiring fast wake-up and low standby consumption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 160 MHz at ±15 V supply - enables baseband signal conditioning up to ~100 MHz without gain peaking or phase degradation |
| Slew Rate | 450 V/µs - supports clean 2 VPP differential step response with 96 ns settling to 0.1% |
| THD @ 1 MHz | –79 dB (differential in/out) - meets 16-bit ADC driver linearity requirements for high-resolution digitization |
| Input Noise | 6.5 nV/√Hz - preserves SNR in low-level sensor signal amplification before ADC sampling |
| Shutdown Current | 0.88 mA - reduces system idle power by >94% vs. 16 mA active ICC, enabling battery-aware instrumentation |
| CMRR | 84 dB (typical) - rejects coupled noise on shared PCB traces or noisy digital supplies in mixed-signal layouts |
| VOCM Range | –4 V to +4.5 V - allows precise alignment of differential output common-mode to ADC reference mid-rail |
Pinout & Package
THS4140CD is housed in an 8-pin MSOP PowerPAD™ package (DGN), featuring an exposed thermal pad on the underside for direct PCB copper connection to enhance thermal dissipation. The package supports JEDEC-standard reflow and requires soldering of the thermal pad to a dedicated thermal plane per TI SLMA002/SLMA004 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VIN− | Inverting input | Differential input node; matched impedance critical for CMRR and harmonic cancellation |
| 2: VOCM | Output common-mode control | DC bias setting point for both outputs; bypass with 0.1 µF capacitor to suppress noise coupling |
| 3: VCC+ | Positive supply rail | Accepts +2.5 V to +15 V (dual) or +5 V (single); requires local 0.1 µF + 6.8 µF decoupling |
| 4: VOUT+ | Positive differential output | Delivers inverted or non-inverted signal depending on gain topology; drives ADC AIN+ or transformer primary |
| 5: VIN+ | Non-inverting input | Differential input node; must mirror VIN− trace length and layout for symmetry |
| 6: PD | Power-down enable (active low) | Pulls to VCC− to enter shutdown; internal 50 kΩ pull-up keeps device active if left floating |
| 7: VCC− | Negative supply rail | Accepts –2.5 V to –15 V (dual); connects to PD pin for shutdown activation |
| 8: VOUT− | Negative differential output | Complementary output to VOUT+; together forms low-noise, high-SNR differential pair into ADC inputs |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Enables true differential signaling end-to-end, rejecting common-mode noise at input, output, and power rails |
| VOCM-controlled output level shift | Allows independent DC bias adjustment of differential outputs to match ADC reference voltage without affecting gain |
| Active shutdown (PD pin) | Reduces quiescent current to 0.88 mA while maintaining high-Z outputs-ideal for time-multiplexed channel architectures |
| MSOP PowerPAD™ thermal package | θJC = 4.7 °C/W enables >1.7 W power dissipation at TA = 25°C when thermal pad is soldered to PCB copper |
| Wide supply range support | Operates from 5 V single supply (VOCM = VCC/2) to ±15 V dual supply-flexible for legacy and low-voltage systems |
Applications
| High-Fidelity Data Acquisition | Differential ADC Driver |
|---|---|
Use Scenario: Precision measurement of low-amplitude sensor signals (e.g., strain gauges, RTDs) in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Front-end signal conditioner converting single-ended sensor output to balanced differential drive for 16-bit SAR ADC. Use Value: 84 dB CMRR rejects ground-loop noise; –79 dB THD preserves dynamic range; VOCM aligns output to ADC's internal reference. | Use Scenario: Driving the differential inputs of high-speed pipeline ADCs (e.g., ADS5463) in communications test equipment. IC Role / Device Role / Timing Role: Bandwidth-optimized driver providing full-scale 2 VPP differential signal with <100 ns settling. Use Value: 160 MHz bandwidth and 450 V/µs slew rate ensure accurate reproduction of multi-MHz IF signals without slewing-induced distortion. |
| Antialiasing Filter Interface | Low-Noise Instrumentation Signal Chain |
Use Scenario: Active antialiasing stage preceding ADC in spectrum analyzers, where out-of-band noise must be suppressed before sampling. IC Role / Device Role / Timing Role: Integrates with passive RC network to form 2nd-order low-pass filter; provides gain and buffering. Use Value: Differential output eliminates need for balun; 6.5 nV/√Hz noise floor ensures filter doesn't degrade overall SNR. | Use Scenario: Low-distortion amplification of audio-grade or medical ECG signals prior to digitization in portable diagnostics devices. IC Role / Device Role / Timing Role: Single-supply (5 V) fully differential amplifier with VOCM tied to mid-rail, eliminating external level-shifting circuitry. Use Value: Shutdown mode (PD pin) cuts power during idle periods; 0.88 mA ICC(SD) extends battery life in handheld instruments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4141CD | No PD pin; fixed operation only; identical bandwidth, noise, and distortion specs | Not suitable for power-gated or duty-cycled systems requiring shutdown capability | Select THS4141CD only when continuous operation is guaranteed and board space allows omission of PD control logic |
| THS4131CDGN | 150 MHz BW, 51 V/µs SR, 1.3 nV/√Hz noise; no shutdown; DGN package same footprint | Better noise performance but lower slew rate limits large-signal fidelity at high frequencies | Prefer THS4131CDGN for ultra-low-noise, moderate-speed (<50 MHz) applications where THS4140CD's 450 V/µs is unnecessary |
Compared with THS4141CD and THS4131CDGN, THS4140CD uniquely combines active shutdown, 160 MHz bandwidth, and 450 V/µs slew rate in the same DGN package-making it the only choice for high-speed, power-aware differential signal chains requiring rapid enable/disable cycling.
Availability
THS4140CD is available at Aetrix Electronics and suitable for high-speed data acquisition, precision ADC interface, and differential communication link applications requiring stable component supply across industrial temperature ranges (0°C to 70°C).
Supply support for THS4140CD 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 with over 50 years of innovation in high-performance signal chain solutions.
The THS4140CD belongs to TI's High-Speed Fully Differential I/O Amplifier product line, engineered specifically for precision differential signal conditioning in ADC driver, antialiasing, and instrumentation applications demanding wide bandwidth, low distortion, and flexible power management.
FAQ
What is the function of the PD pin on the THS4140CD?
The PD (Power-Down) pin on the THS4140CD is an active-low control input that places the amplifier into a low-power shutdown state when pulled below ≈1.4 V above VCC−. In shutdown, quiescent current drops to 0.88 mA and output impedance exceeds 1 MΩ, enabling power gating in time-division multiplexed systems. THS4140CD remains fully operational when PD is left unconnected due to an internal 50 kΩ pull-up to VCC.
How does VOCM affect the output of the THS4140CD?
VOCM sets the common-mode voltage of both differential outputs (VOUT+ and VOUT−) in the THS4140CD. When driven externally, it precisely centers the output swing relative to the ADC's reference voltage-e.g., tying VOCM to AVDD/2 for a 5 V single-supply ADC. Internally, VOCM defaults to mid-rail if left open, but a 0.1 µF bypass capacitor is required for stability and noise immunity in all configurations of THS4140CD.
Can the THS4140CD operate from a single 5-V supply?
Yes, the THS4140CD supports single 5-V supply operation with VCC+ = 5 V and VCC− = 0 V. In this configuration, VOCM defaults to 2.5 V (mid-rail), enabling direct interfacing with 5 V differential ADCs. Input common-mode range is –4 V to +4.5 V, and output swing reaches 1.2 V to 3.8 V (single-ended) or ±1.3 V differential-sufficient for driving most modern 16-bit ADCs without level-shifting circuitry.
What thermal design considerations apply to the THS4140CD in DGN package?
The THS4140CD in MSOP PowerPAD™ (DGN) package requires soldering of the exposed thermal pad to a dedicated PCB copper pour connected to internal/external ground planes. Per TI SLMA002, this pad must be thermally anchored using ≥4 thermal vias (0.3 mm diameter) to inner layers. Failure to connect the pad risks junction temperatures exceeding 125°C under 16 mA ICC load, degrading distortion performance and long-term reliability of THS4140CD.
Why does the THS4140CD specify resistor matching requirements in its application notes?
The THS4140CD's CMRR, PSRR, and second-harmonic cancellation depend critically on symmetrical feedback networks. Application Note SLOS320F mandates ≤1% tolerance for Rf and Rg resistors because mismatch >0.5% degrades CMRR by >10 dB and increases even-order distortion. This requirement directly impacts THS4140CD performance in precision ADC driver roles-where unmatched resistors introduce measurable offset and distortion not corrected by calibration.
THS4140CD 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:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 450V/µs
- Gain Bandwidth Product:
- 205 MHz
- -3db Bandwidth:
- 160 MHz
- Current - Input Bias:
- 5.1 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 13.2mA
- Current - Output / Channel:
- 85 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 33 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS4140CD FAQ
1.How can I place an order for THS4140CD through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4140CD 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 THS4140CD reliable?
The price and inventory of THS4140CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4140CD is usually 5 days.
3.What payment methods are accepted for THS4140CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4140CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4140CD?
THS4140CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4140CD 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 THS4140CD?
For technical support, including THS4140CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4140CD requirements.
6.How does Aetrix verify that THS4140CD is sourced from the original manufacturer or authorized distributors?
All THS4140CD 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 THS4140CD meets industry standards.
7.What is the process for return or replacement of THS4140CD?
All THS4140CD units undergo pre-shipment inspection (PSI). If there is an issue with THS4140CD, 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 THS4140CD part is unused and in its original packaging.
Return procedure for THS4140CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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