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Texas Instruments THS4151CD
- Part No.:
- THS4151CD
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4151CD.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
THS4151CD from Texas Instruments is a high-speed fully differential amplifier optimized for precision ADC driving, antialias filtering, and differential signal conditioning in data acquisition systems. It delivers 150 MHz –3 dB bandwidth (VCC = ±5 V), 650 V/µs slew rate (VCC = ±15 V), –83 dB total harmonic distortion at 1 MHz, 7.6 nV/√Hz input-referred voltage noise, and operates from ±2.5 V to ±15 V dual supply or 5 V single supply.
For engineers reviewing the THS4151CD datasheet, THS4151CD pinout, THS4151CD application, or THS4151CD equivalent, this device is selected for high-fidelity analog front-ends where balanced differential signaling, common-mode noise rejection, and low distortion at >10 MHz frequencies are critical - especially in instrumentation, medical imaging, and communications receiver chains.
Technical Context
The THS4151CD implements a true fully differential signal path from input to output using TI's BiComI complementary bipolar process, enabling inherent common-mode noise rejection and second-harmonic cancellation. Its architecture supports both differential-input/differential-output and single-ended-input/differential-output configurations with gain set by external resistor networks (e.g., Rf = 390 Ω, Rg = 390 Ω for G = 1).
It features a dedicated VOCM pin for precise control of output common-mode level, wide input common-mode range (VS– +1.5 V to VS+ –1.5 V), and rail-to-rail output swing (±3.6 V on ±5 V supply). The device lacks shutdown functionality - unlike the THS4150CD - confirmed by absence of PD pin and omission of ICC(SD) specification in THS4151 electrical characteristics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 150 MHz at ±5 V supply - enables baseband signal amplification up to Nyquist frequency of 75 MSPS ADCs without roll-off. |
| Slew Rate | 650 V/µs at ±15 V - supports full-scale transient response for 2 VPP signals within 3 ns, critical for fast-settling data converters. |
| Total Harmonic Distortion | –83 dB at 1 MHz, –65 dB at 8 MHz (G = 1, RL = 800 Ω) - ensures minimal spectral contamination in high-resolution (≥14-bit) digitization. |
| Input Voltage Noise | 7.6 nV/√Hz above 10 kHz - dominates system noise floor in medium-bandwidth applications, limiting effective resolution to ~16 bits at 100 kHz. |
| Common-Mode Rejection | –83 dB over full temperature range - rejects coupled power-supply or ground noise, preserving differential signal integrity in noisy environments. |
| Output Swing | ±3.6 V on ±5 V supply - delivers 7.2 VPP differential output into 800 Ω load, matching typical ADC input ranges without attenuation. |
| Supply Range | ±2.5 V to ±15 V dual or 5 V single - supports flexible system-level power architecture including mixed-signal SoC interfaces. |
Pinout & Package
The THS4151CD is housed in an 8-pin SOIC (D package) with exposed PowerPAD™ thermal pad on underside, requiring connection to PCB ground plane for thermal management per TI SLMA002/SLMA004 guidelines.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN− | Inverting input terminal - forms differential pair with VIN+; accepts common-mode voltage from VS− +1.5 V to VS+ −1.5 V. |
| 2 | VOCM | Output common-mode control pin - sets DC level of both outputs; bypass with 0.1 µF capacitor to suppress noise coupling. |
| 3 | VCC+ | Positive supply rail - supports operation from +2.5 V to +15 V in dual supply or +5 V in single supply mode. |
| 4 | VOUT+ | Positive differential output - provides inverted or non-inverted signal depending on configuration; low 0.4 Ω output impedance. |
| 5 | VIN+ | Non-inverting input terminal - completes differential input stage; matched impedance and noise performance to VIN−. |
| 6 | NC | No connect - internally unconnected; must remain floating or tied to ground per layout best practices. |
| 7 | VCC− | Negative supply rail - supports operation from −2.5 V to −15 V in dual supply; omitted in 5 V single-supply use. |
| 8 | VOUT− | Negative differential output - complements VOUT+; maintains amplitude and phase balance for optimal CMRR. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Enables true differential signaling end-to-end, rejecting common-mode interference at input, output, and power rails. |
| Single-ended to differential conversion | Supports direct interface to single-ended sensors or DACs without transformers or baluns, reducing BOM and board area. |
| Adjustable output common-mode level | VOCM pin allows precise alignment of differential output midpoint to ADC reference voltage (e.g., AVDD/2), eliminating level-shifting circuitry. |
| High slew rate with low distortion | 650 V/µs slew rate sustains <0.01% settling in 247 ns for 2 VPP step while maintaining –83 dB THD at 1 MHz - critical for wideband digitization. |
| Wide supply flexibility | Operates from ±2.5 V to ±15 V dual supply or 5 V single supply, enabling compatibility with legacy ±15 V systems and modern low-voltage embedded platforms. |
Applications
| Instrumentation Amplifier Front-End | Medical Ultrasound Receiver Chain |
|---|---|
Use Scenario: High-precision sensor signal conditioning before 16-bit SAR ADC sampling at 1 MSPS. IC Role / Device Role / Timing Role: Differential driver that converts single-ended bridge output to balanced signal while rejecting EMI-coupled noise on PCB traces. Use Value: 150 MHz bandwidth preserves transient fidelity of microvolt-level strain gauge responses; –83 dB THD prevents harmonic folding into baseband. |
Use Scenario: Post-LNA amplification and antialias filtering prior to 12-bit pipeline ADC in beamforming module. IC Role / Device Role / Timing Role: Active antialias filter driver with programmable VOCM to match ADC input range across varying gain stages. Use Value: 7.6 nV/√Hz noise floor ensures >70 dB SNR at 5 MHz receive band; differential outputs suppress clock feedthrough in high-density multilayer boards. |
| Communications Baseband Transceiver | Automotive Radar Signal Conditioning |
Use Scenario: I/Q channel amplification in 5G NR FR1 digital predistortion feedback loop operating up to 300 MHz IF. IC Role / Device Role / Timing Role: Differential transmitter driver converting baseband DAC outputs to balanced RF mixer inputs. Use Value: 150 MHz bandwidth supports 100 MHz complex baseband signals; matched VOUT+/VOUT− paths ensure <0.1° phase skew for accurate quadrature modulation. |
Use Scenario: Low-noise amplification of 77 GHz FMCW radar echo signals after downconversion to 10–20 MHz IF. IC Role / Device Role / Timing Role: ADC driver for high-speed 14-bit ADC sampling at 50 MSPS in automotive ADAS ECU. Use Value: –83 dB THD at 10 MHz prevents intermodulation distortion from adjacent chirps; ±3.6 V swing drives ADC full scale without clipping. |
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 | Higher 450 V/µs slew rate but lower 160 MHz bandwidth; 6.5 nV/√Hz noise vs. THS4151CD's 7.6 nV/√Hz. | Better suited for ultrafast pulse applications (e.g., time-of-flight); less optimal for wideband low-distortion ADC driving above 10 MHz. | Select THS4141CD when slew-limited settling dominates system timing; retain THS4151CD for balanced THD/bandwidth/noise trade-off. |
| THS4561IRGET | Lower 100 MHz bandwidth but integrated resistors, rail-to-rail I/O, and 2.1 nV/√Hz noise; uses 12-pin QFN package. | Targets space-constrained, low-voltage (2.7–5.4 V) designs with simplified layout; not pin-compatible and requires different gain-setting approach. | Choose THS4561IRGET for compact, low-power portable instrumentation; THS4151CD remains preferred for high-voltage, high-fidelity industrial DAQ. |
Compared with THS4141CD and THS4561IRGET, the THS4151CD offers the optimal compromise of 150 MHz bandwidth, –83 dB THD at 1 MHz, and proven thermal robustness in SOIC PowerPAD™ packaging - making it the default choice for demanding ADC driver applications requiring long-term reliability under continuous high-frequency operation.
Availability
THS4151CD is available at Aetrix Electronics and suitable for instrumentation front-ends, medical ultrasound receivers, and communications transceivers requiring stable component supply across extended temperature ranges (0°C to 70°C).
Supply support for THS4151CD 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 amplifier design and manufacturing.
The THS4151CD belongs to TI's high-speed differential I/O amplifier product line, engineered specifically for precision data acquisition systems where differential signaling, low distortion, and wide dynamic range are essential.
FAQ
What is the function of the VOCM pin on the THS4151CD?
The VOCM pin on the THS4151CD sets the common-mode voltage level of both differential outputs (VOUT+ and VOUT−). When left unconnected, it defaults to midrail (e.g., 2.5 V on 5 V supply); applying an external voltage allows precise alignment to ADC reference levels. A 0.1 µF bypass capacitor is required for stability and noise suppression, as specified in the THS4151CD datasheet Figure 30 and Application Information section.
Does the THS4151CD support shutdown mode?
No, the THS4151CD does not support shutdown mode. Unlike the THS4150CD - which includes a PD (power-down) pin and specifies ICC(SD) = 1 mA - the THS4151CD omits the PD pin (replaced by NC on pin 6) and contains no shutdown-related specifications in its Electrical Characteristics table. This is confirmed by the pinout diagram and absence of power-down timing parameters in the THS4151CD datasheet.
What is the maximum safe supply voltage for the THS4151CD?
The absolute maximum supply voltage for the THS4151CD is ±16.5 V (VCC+ to VCC−), as stated in the Absolute Maximum Ratings table. However, recommended operation is limited to ±15 V dual supply or 5 V single supply. Exceeding ±16.5 V risks permanent damage; operation above ±15 V may degrade distortion performance and accelerate long-term reliability failure due to junction temperature rise.
Can the THS4151CD drive capacitive loads directly?
The THS4151CD should not drive capacitive loads >10 pF directly due to reduced phase margin causing ringing or oscillation. Per the Driving a Capacitive Load section (Figure 34), a minimum 20 Ω series resistor must be placed between each output and the load. This isolates capacitance while maintaining signal integrity - particularly important in 50 Ω transmission line applications where the resistor also provides source termination.
How does resistor matching affect THS4151CD performance?
Resistor matching directly impacts THS4151CD performance: mismatched feedback (Rf) or gain-setting (Rg) resistors degrades CMRR, PSRR, and second-harmonic cancellation. The datasheet recommends 1% tolerance or better for all external resistors. For example, 0.1% mismatch in Rf/Rg can reduce CMRR by >10 dB at 1 MHz, increasing susceptibility to power-supply noise and distorting differential output symmetry.
THS4151CD 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:
- 650V/µs
- Gain Bandwidth Product:
- 340 MHz
- -3db Bandwidth:
- 150 MHz
- Current - Input Bias:
- 4.3 µA
- Voltage - Input Offset:
- 1.1 mV
- Current - Supply:
- 17.5mA
- 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
THS4151CD FAQ
1.How can I place an order for THS4151CD through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4151CD 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 THS4151CD reliable?
The price and inventory of THS4151CD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4151CD is usually 5 days.
3.What payment methods are accepted for THS4151CD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4151CD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4151CD?
THS4151CD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4151CD 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 THS4151CD?
For technical support, including THS4151CD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4151CD requirements.
6.How does Aetrix verify that THS4151CD is sourced from the original manufacturer or authorized distributors?
All THS4151CD 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 THS4151CD meets industry standards.
7.What is the process for return or replacement of THS4151CD?
All THS4151CD units undergo pre-shipment inspection (PSI). If there is an issue with THS4151CD, 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 THS4151CD part is unused and in its original packaging.
Return procedure for THS4151CD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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