My Inquiry
My Account
Texas Instruments THS4521IDGKT
- Part No.:
- THS4521IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
THS4521IDGKT.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,578
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
THS4521IDGKT 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, 4.6 nV/√Hz input voltage noise, and operates from +2.5 V to +5.5 V supply. It is used as a precision ADC driver for SAR and ΔΣ converters such as ADS1278 in data acquisition systems.
For engineers reviewing the THS4521IDGKT datasheet, THS4521IDGKT pinout, THS4521IDGKT application, or THS4521IDGKT equivalent, key selection criteria include its rail-to-rail output swing, VOCM-controlled common-mode output, negative-rail input capability, low 1.14 mA quiescent current per channel, and compatibility with low-voltage, high-density signal chains requiring dc-coupled differential interfaces.
Technical Context
The THS4521IDGKT implements a fully differential architecture with independent VOCM input enabling precise control of output common-mode voltage-critical for dc-coupled interfacing to ADCs like ADS1278. Its negative-rail input stage allows ground-referenced single-ended sources to be directly connected without level-shifting circuitry.
It features power-down functionality (20 μA typical quiescent current), wide supply range (+2.5 V to +5.5 V), and industrial temperature operation (–40°C to +85°C). The device maintains high dynamic performance-including 119 dB open-loop gain and –141 dBc HD3 at 10 kHz-even under low-power conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = 1) | 145 MHz - supports high-speed sampling up to ~70 MSPS with adequate closed-loop margin |
| Slew Rate | 490 V/μs - enables full-scale settling of 2-VPP differential signals within 3.4 ns rise time |
| Input Voltage Noise | 4.6 nV/√Hz at 100 kHz - preserves SNR in precision audio and measurement front-ends |
| HD2 / HD3 @ 10 kHz | –133 dBc / –141 dBc - meets >18-bit ENOB requirements for high-resolution ADC drivers |
| Quiescent Current | 1.14 mA per channel - enables battery-powered or thermally constrained designs |
| Supply Range | +2.5 V to +5.5 V - compatible with 3.3 V and 5 V systems; no dual-supply required |
| Output Swing | Rail-to-rail - delivers full 0.1 V to 4.75 V (5 V supply) differential output range |
| Input Common-Mode Range | Extends to negative rail - accepts 0 V referenced inputs without external biasing |
Pinout & Package
VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, thin-profile surface-mount, thermal pad not exposed.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Noninverting input | Accepts single-ended or differential input; referenced to VOCM for common-mode control |
| VIN− | Inverting input | Completes fully differential input pair; matched to VIN+ for balanced signal rejection |
| VOCM | Output common-mode control | Directly sets DC output common-mode level (0.8 V to 4.2 V); enables dc-coupled ADC interface |
| VOUT+ | Noninverting output | Differential output terminal; rail-to-rail swing supports direct connection to ADC inputs |
| VOUT− | Inverting output | Complementary differential output; maintains amplitude and phase balance with VOUT+ |
| VS+ | Positive supply | Accepts +2.5 V to +5.5 V; no external decoupling required beyond standard 0.1 µF ceramic |
| VS− | Negative supply / ground | Connected to system ground; supports single-supply operation with true negative-rail input |
| PD | Power-down enable | Logic-low disables amplifier (20 μA IQ); open or logic-high enables normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential architecture | Enables rejection of even-order harmonics and common-mode noise in mixed-signal systems |
| Negative-rail input (NRI) | Allows direct interface to ground-referenced sensors and DACs without level-shifting circuitry |
| Rail-to-rail output (RRO) | Maximizes dynamic range into ADCs with limited input voltage windows (e.g., ADS1278) |
| VOCM-controlled output common-mode | Permits precise alignment of FDA output to ADC reference mid-point for dc-coupled operation |
| Low 1.14 mA quiescent current | Supports high-channel-count data loggers and portable instrumentation with thermal constraints |
| Power-down mode (20 μA) | Reduces system-level standby power in multi-FDA configurations or intermittent acquisition modes |
Applications
| Low-Power SAR ADC Driver | High-Resolution ΔΣ ADC Interface |
|---|---|
Use Scenario: Driving ADS1278 24-bit ΔΣ ADC in portable energy metering hardware with 5 V single supply. IC Role / Device Role / Timing Role: Fully differential amplifier providing dc-coupled, matched gain and common-mode translation between analog sensor front-end and ADC inputs. Use Value: Enables direct connection without external bias resistors or AC coupling, preserving low-frequency accuracy and reducing BOM count. | Use Scenario: Signal conditioning for 1 MSPS SAR ADC in industrial PLC analog input modules. IC Role / Device Role / Timing Role: High-speed FDA configured as unity-gain buffer with VOCM set to mid-supply for optimal ADC full-scale utilization. Use Value: Delivers 145 MHz bandwidth and sub-10 ns settling to support accurate sampling at maximum throughput. |
| Low-Power Differential Audio Amplifier | Portable Instrumentation Front-End |
Use Scenario: Line-level differential audio driver in battery-powered audio analyzers with 3.3 V supply. IC Role / Device Role / Timing Role: Low-noise FDA driving balanced audio codec inputs while maintaining THD+N < –112 dBc at 1 kHz. Use Value: Achieves studio-grade audio fidelity with only 1.14 mA supply current-enabling >20-hour runtime on Li-ion cells. | Use Scenario: Sensor signal conditioning in handheld multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Precision FDA amplifying mV-level transducer outputs with rail-to-rail output swing into microcontroller ADCs. Use Value: Negative-rail input eliminates need for input biasing, simplifying layout and improving offset stability over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4531IDGKT | Lower bandwidth (36 MHz), lower power (0.25 mA), higher input noise (10 nV/√Hz) | Better suited for sub-100 kSPS precision measurement where ultra-low IQ dominates performance needs | Select THS4531IDGKT when power budget is <0.3 mA and bandwidth ≤50 MHz suffices |
| THS4541IRGTT | Higher bandwidth (850 MHz), higher power (10.1 mA), lower noise (2.2 nV/√Hz), same VOCM control | Targeted at RF sampling and wideband communications where >200 MSPS ADC support is required | Select THS4541IRGTT when system demands >500 MHz small-signal bandwidth and can accommodate >10× higher IQ |
Compared with THS4521IDGKT, THS4531IDGKT trades bandwidth and noise for ultra-low power, while THS4541IRGTT delivers RF-grade speed at significantly higher current draw-making THS4521IDGKT the optimal balance for 1–100 MSPS data acquisition with strict thermal and battery-life constraints.
Availability
THS4521IDGKT is available at Aetrix Electronics and suitable for low-power SAR and ΔΣ ADC drivers, portable instrumentation front-ends, and differential audio amplifiers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for THS4521IDGKT 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 in data acquisition systems-emphasizing rail-to-rail output, negative-rail input, and VOCM-controlled common-mode alignment for seamless ADC interfacing.
FAQ
What is the recommended supply voltage range for THS4521IDGKT?
The THS4521IDGKT operates from a single supply of +2.5 V to +5.5 V. At 5 V supply, it achieves 145 MHz bandwidth and 490 V/μs slew rate; at 3.3 V, bandwidth reduces to 135 MHz but quiescent current remains near 1.0 mA. The device is not rated for dual-supply operation, and VS− must be connected to ground.
Does THS4521IDGKT support dc-coupled connection to ADCs like ADS1278?
Yes. THS4521IDGKT supports dc-coupled ADC interfacing via its VOCM pin, which precisely controls output common-mode voltage from 0.8 V to 4.2 V (at 5 V supply). This allows direct matching to ADS1278's input common-mode range without AC coupling capacitors or resistor dividers-preserving low-frequency response and reducing component count.
What is the function of the PD pin on THS4521IDGKT?
The PD (power-down) pin on THS4521IDGKT disables the amplifier core when pulled low (<0.7 V), reducing quiescent current to 20 μA typical. When left open or pulled high (>2.1 V), the device operates normally. This feature enables dynamic power gating in multi-channel systems or intermittent acquisition modes without external sequencing.
Can THS4521IDGKT drive heavy capacitive loads such as 2.2 nF?
Yes. THS4521IDGKT is characterized to drive 2.2 nF loads (e.g., ADC input capacitance plus PCB trace), with stable operation and minimal peaking when used with appropriate feedback network design. The datasheet specifies performance with 2.2 nF load in FFT plots and confirms robustness via output impedance measurements (0.3 Ω at 1 MHz).
How does THS4521IDGKT achieve negative-rail input capability?
THS4521IDGKT uses an input stage topology that extends the common-mode input range down to the negative rail (VS−, typically ground). At 5 V supply, this allows VIN+ and VIN− to accept signals from –0.1 V to 3.6 V-enabling direct connection of ground-referenced sources without level-shifting circuitry or input bias networks.
THS4521IDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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-VSSOP
THS4521IDGKT FAQ
1.How can I place an order for THS4521IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4521IDGKT 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 THS4521IDGKT reliable?
The price and inventory of THS4521IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4521IDGKT is usually 5 days.
3.What payment methods are accepted for THS4521IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4521IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4521IDGKT?
THS4521IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4521IDGKT 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 THS4521IDGKT?
For technical support, including THS4521IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4521IDGKT requirements.
6.How does Aetrix verify that THS4521IDGKT is sourced from the original manufacturer or authorized distributors?
All THS4521IDGKT 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 THS4521IDGKT meets industry standards.
7.What is the process for return or replacement of THS4521IDGKT?
All THS4521IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with THS4521IDGKT, 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 THS4521IDGKT part is unused and in its original packaging.
Return procedure for THS4521IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
THS4521IDGKT Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
