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Texas Instruments THS4521ID
- Part No.:
- THS4521ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4521ID.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:806
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Product details
Overview
THS4521ID from Texas Instruments is a single-channel, very low-power, fully differential amplifier (FDA) with negative-rail input and rail-to-rail output. It delivers 145 MHz bandwidth (G = 1), 490 V/μs slew rate, –133 dBc HD2 at 10 kHz, and operates from +2.5 V to +5.5 V supply. It is used as a precision ADC driver in low-power data acquisition systems interfacing with SAR or ΔΣ converters such as ADS1278.
For engineers reviewing the THS4521ID datasheet, THS4521ID pinout, THS4521ID application, or THS4521ID equivalent, key selection criteria include its rail-to-rail output swing, VOCM-controlled common-mode output, –40°C to +85°C industrial temperature range, and verified performance driving high-resolution ADCs with <0.00025% THD+N at 1 kHz.
Technical Context
The THS4521ID implements a fully differential architecture with independent VOCM input for precise output common-mode voltage control-enabling DC-coupled interface to ADCs without level-shifting circuitry. Its negative-rail input stage allows ground-referenced single-ended signal sources to be directly connected.
It features internal power-down capability (20 μA quiescent current), open-loop gain of 119 dB, and input voltage noise of 4.6 nV/√Hz at 100 kHz. The device maintains <1% overshoot and 10 ns settling time to 1% under large-signal conditions with 2-V step input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = 1) | 145 MHz - supports wideband signal conditioning up to ~70 MHz Nyquist for high-speed ADCs |
| Slew Rate | 490 V/μs - enables clean reproduction of fast transient signals without slewing distortion |
| HD2 / HD3 @ 10 kHz | –133 dBc / –141 dBc - ensures minimal harmonic contamination in audio and precision measurement paths |
| Input Voltage Noise | 4.6 nV/√Hz @ 100 kHz - preserves SNR in low-amplitude, high-gain front-end stages |
| Quiescent Current | 1.14 mA per channel @ 5 V - enables battery-powered or thermally constrained designs |
| Supply Range | +2.5 V to +5.5 V single supply - simplifies power architecture vs dual-supply FDAs |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded and instrumentation applications |
Pinout & Package
THS4521ID is available in SOIC-8 (D) and VSSOP-8 (DGK) packages, both measuring 4.90 mm × 3.91 mm (SOIC) or 3.00 mm × 3.00 mm (VSSOP). Pin functions are identical across packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Noninverting input | Accepts single-ended or differential input; supports common-mode down to negative rail |
| VIN− | Inverting input | Completes differential input pair; matched impedance critical for balance error <–57 dB |
| VOCM | Output common-mode control | Directly sets VOUT common-mode level (e.g., 2.5 V for 5-V ADC reference); ±5 mV offset typical |
| VOUT+ | Noninverting output | Differential output terminal; rail-to-rail swing (0.1–4.75 V @ 5 V supply) |
| VOUT− | Inverting output | Complementary differential output; requires matched trace length/impedance for optimal balance |
| VS+ | Positive supply | Accepts 2.5–5.5 V; decoupling capacitor required near pin for stability |
| VS− | Negative supply / ground | Reference node for entire amplifier; tied internally to substrate; must be low-impedance |
| PD | Power-down enable | Logic-low (≤0.7 V) disables amplifier, reducing current to 20 μA; open or high enables operation |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential architecture | Eliminates even-order harmonics and common-mode noise; enables direct connection to differential-input ADCs |
| Negative-rail input (NRI) | Accepts VIN common-mode down to VS−, enabling ground-referenced sensor or DAC outputs without level shifters |
| Rail-to-rail output (RRO) | Delivers full dynamic range to ADCs-e.g., 0.1 V to 4.75 V swing on 5-V supply-maximizing ENOB |
| VOCM-controlled output common-mode | Allows precise alignment of FDA output common-mode to ADC reference (e.g., AVDD/2), enabling DC coupling |
| Low-power operation | 1.14 mA/ch at 5 V supports portable, multi-channel, or thermally sensitive systems without forced cooling |
Applications
| Low-Power SAR ADC Driver | High-Performance Audio Interface |
|---|---|
Use Scenario: Driving ADS1278 24-bit ΔΣ ADC in portable data logger with 5-V single supply and battery constraint. IC Role / Device Role / Timing Role: Fully differential amplifier providing gain = 1, VOCM = 2.5 V, and matched output drive to ADC's AINP/AINN inputs. Use Value: Enables DC-coupled, low-noise signal path with 105.5 dB SINAD and 113.7 dB SFDR-preserving full ADC resolution without external biasing. | Use Scenario: Line-level differential audio preamplifier in professional mixer with 22-kHz bandwidth requirement. IC Role / Device Role / Timing Role: Single-ended-to-differential converter and buffer with THD+N = –112 dBc (0.00025%) at 1 kHz. Use Value: Delivers studio-grade audio fidelity with rail-to-rail output swing and –133 dBc HD2-eliminating need for output AC coupling or level shifting. |
| Low-Power Differential Signal Conditioning | Industrial Sensor Interface |
Use Scenario: Amplifying low-amplitude bridge sensor output (e.g., load cell) before digitization in PLC I/O module. IC Role / Device Role / Timing Role: Precision FDA configured for G = 10, VOCM = 1.25 V, rejecting common-mode noise from long cables. Use Value: Achieves 119 dB open-loop gain and 102 dB CMRR to suppress EMI-induced offsets-reducing calibration overhead. | Use Scenario: Interfacing 4–20 mA current-loop transmitters to isolated ADCs in hazardous-area monitoring systems. IC Role / Device Role / Timing Role: Low-power FDA converting single-ended current-loop voltage drop to differential signal with VOCM = 0.8–4.2 V programmability. Use Value: Supports wide VOCM range (0.8–4.2 V) and operates down to 2.5 V supply-enabling compatibility with diverse isolation and reference architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4531ID | Lower bandwidth (36 MHz), lower IQ (0.25 mA), higher input noise (10 nV/√Hz), no VOCM control | Targeted at ultra-low-power, narrowband sensor interfaces where VOCM alignment is unnecessary | Choose THS4531ID only when power budget is tighter than 1 mA and VOCM control is not required for ADC interfacing |
| THS4541IRGTR | Higher bandwidth (850 MHz), higher IQ (10.1 mA), lower THD (–137 dBc HD2), VOCM control retained | Designed for high-speed, high-fidelity applications like communications receivers and wideband test equipment | Choose THS4541IRGTR when >200 MSPS ADCs or sub-100 ps settling is required-accepting higher power and cost |
Compared with THS4521ID, THS4531ID trades bandwidth and VOCM control for ultra-low power, while THS4541IRGTR delivers 6× bandwidth and superior linearity at 9× quiescent current-making THS4521ID the optimal balance for industrial ADC drivers requiring precision, low power, and DC-coupled flexibility.
Availability
THS4521ID is available at Aetrix Electronics and suitable for low-power data acquisition, industrial sensor interfaces, and portable audio systems requiring stable component supply and guaranteed long-term sourcing.
Supply support for THS4521ID 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The THS452x family was designed specifically for low-power, high-performance differential signal conditioning-targeting SAR and ΔΣ ADC drivers in industrial, medical, and portable instrumentation where power, noise, and DC-coupling capability are critical.
FAQ
What is the maximum small-signal bandwidth of THS4521ID at G = 1 and 5-V supply?
The THS4521ID achieves 145 MHz small-signal bandwidth at G = 1 with VS+ = 5 V and VS− = 0 V, as specified in the Electrical Characteristics table under "Small-signal bandwidth" (Test Condition: VOUT = 100 mVPP). This bandwidth supports high-frequency signal conditioning for ADCs sampling up to ~70 MSPS while maintaining flatness and phase integrity.
Does THS4521ID support DC-coupled connection to differential-input ADCs?
Yes, THS4521ID supports DC-coupled connection via its VOCM pin, which allows precise setting of output common-mode voltage (e.g., 2.5 V for a 5-V ADC reference). With VOCM = 2.5 V ±1 V and typical offset <±5 mV, THS4521ID ensures accurate alignment to ADC input common-mode requirements without external resistive dividers or capacitors.
What is the power-down current consumption of THS4521ID?
The THS4521ID draws 20 μA (typical) in power-down mode when the PD pin is held ≤0.7 V. This ultra-low standby current enables rapid wake-up (turn-on delay = 70 ns) while minimizing system-level power loss during idle periods-critical for battery-operated data loggers and sensor nodes.
Can THS4521ID drive a 50-Ω load linearly?
Yes, THS4521ID delivers ±55 mA output current into 50 Ω (at 5 V supply), supporting direct drive of coaxial transmission lines or RF ADC inputs. However, for optimal linearity and distortion performance, TI recommends using ≥200 Ω loads; 50 Ω operation may increase harmonic distortion by ~3–5 dB depending on signal amplitude and frequency.
What package options are available for THS4521ID?
THS4521ID is offered in two industry-standard packages: 8-pin SOIC (D package, 4.90 mm × 3.91 mm) and 8-pin VSSOP (DGK package, 3.00 mm × 3.00 mm). Both share identical pinout and electrical specifications; the VSSOP variant is preferred for space-constrained PCB layouts, while SOIC offers easier prototyping and manual soldering.
THS4521ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential, Rail-to-Rail
- Slew Rate:
- 600V/µs
- Gain Bandwidth Product:
- 95 MHz
- -3db Bandwidth:
- 145 MHz
- Current - Input Bias:
- 700 nA
- Voltage - Input Offset:
- 240 µV
- Current - Supply:
- 1.14mA
- Current - Output / Channel:
- 55 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS4521ID FAQ
1.How can I place an order for THS4521ID through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4521ID 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 THS4521ID reliable?
The price and inventory of THS4521ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4521ID is usually 5 days.
3.What payment methods are accepted for THS4521ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4521ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4521ID?
THS4521ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4521ID 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 THS4521ID?
For technical support, including THS4521ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4521ID requirements.
6.How does Aetrix verify that THS4521ID is sourced from the original manufacturer or authorized distributors?
All THS4521ID 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 THS4521ID meets industry standards.
7.What is the process for return or replacement of THS4521ID?
All THS4521ID units undergo pre-shipment inspection (PSI). If there is an issue with THS4521ID, 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 THS4521ID part is unused and in its original packaging.
Return procedure for THS4521ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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