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Texas Instruments THS4505DGNR
- Part No.:
- THS4505DGNR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
THS4505DGNR.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,350
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Product details
Overview
THS4505DGNR from Texas Instruments is a high-performance, fully differential amplifier optimized for driving 12-bit, 80-MSps analog-to-digital converters (ADCs) in demanding signal chains. It delivers 260 MHz small-signal bandwidth, 1800 V/µs slew rate, –73 dBc third-order intermodulation distortion at 30 MHz, and output common-mode voltage control (VOCM) with ±5 V or single 5 V supply operation.
For engineers reviewing the THS4505DGNR datasheet, THS4505DGNR pinout, THS4505DGNR application, or THS4505DGNR equivalent, this page provides verified specifications, package-validated pin functions, real-world use cases in wireless receivers and active filtering, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The THS4505DGNR implements a fully differential architecture with independent input and output common-mode control, enabling precise DC-coupled interfacing to ADCs and eliminating coupling capacitors. Its input common-mode range extends to the negative rail (–5.7 V at ±5 V supply), supporting ground-referenced single-ended sources.
It features a dedicated VOCM input that sets the differential output's average voltage with 200 MHz small-signal bandwidth and <±0.1 V default offset when left floating. Unlike the THS4504, it lacks power-down functionality-confirmed by pin assignment (PD pin is NC) and electrical characteristics tables excluding power-down parameters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 260 MHz at G = 1 (±5 V supply); enables wideband baseband and IF signal conditioning up to 100 MHz 0.1-dB flatness. |
| Slew rate | 1800 V/µs (±5 V); supports full-scale 2 VPP steps in <1 ns without slewing-induced distortion. |
| IMD3 @ 30 MHz | –73 dBc (200 kHz tone spacing); meets linearity requirements for 12-bit ADCs sampling at 80 MSps with >70 dB SFDR. |
| OIP3 | 29 dBm (referenced to 50 Ω); allows direct drive of high-linearity ADC front-ends without gain-stage compression. |
| Input CM range | –5.7 V to +2.6 V (±5 V supply); accommodates rail-to-rail single-ended inputs including ground-referenced sensors. |
| VOCM bandwidth | 200 MHz (RL = 400 Ω); permits fast common-mode settling during dynamic gain or reference changes in closed-loop systems. |
| Quiescent current | 16–25 mA (±5 V); balances high-speed performance with thermal manageability in MSOP-8 PowerPAD™ package. |
Pinout & Package
THS4505DGNR is housed in an 8-pin MSOP package with exposed thermal pad (PowerPAD™), offering enhanced thermal dissipation (θJA = 58.4°C/W) and improved ac performance versus SOIC-8. The PowerPAD is electrically isolated and must be soldered to PCB ground for optimal thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN− | Inverting input | Differential input node; accepts single-ended or differential signals; input impedance 10⁷ Ω || 1 pF. |
| VIN+ | Non-inverting input | Differential input node; matched to VIN− for >70 dB CMRR across 100 MHz. |
| VOCM | Output common-mode control | DC-biased input setting VOUT,CM; 25 kΩ || 1 pF input impedance; floats to ~0 V if unconnected. |
| VS+ | Positive supply | Accepts +5 V (single) or +5/+7.5 V (dual); max rating 16.5 V absolute. |
| VOUT+ | Positive differential output | Drives ADC AIN+ or transformer primary; delivers ±8 V swing into 1 kΩ load (±5 V supply). |
| VOUT− | Negative differential output | Complementary to VOUT+; output balance error <–65 dB ensures <0.2% amplitude/phase mismatch. |
| VS− | Negative supply | Required for dual-supply operation (–5 V); omitted in single-supply mode (VS− tied to GND). |
| PD | Power-down control | No internal connection (NC); THS4505 variant has no power-down capability-pin must be left unconnected or grounded. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential architecture | Eliminates even-order harmonics and common-mode noise; enables true differential signaling to ADCs without baluns. |
| Output common-mode control (VOCM) | Allows precise alignment of differential output midpoint to ADC reference voltage (e.g., 2.5 V), enabling DC-coupled interfaces. |
| Rail-to-rail input common-mode range | Supports single-ended inputs referenced to ground or negative rails-critical for sensor front-ends and legacy signal sources. |
| High OIP3 and low IMD3 | Preserves signal integrity in wideband receiver chains where adjacent-channel interference must be suppressed below –70 dBc. |
| MSOP-8 PowerPAD™ package | Reduces thermal resistance by 90% vs standard MSOP-8 (θJC = 4.7°C/W), enabling sustained 260 MHz operation at +85°C ambient. |
Applications
| Wireless Communication Receiver | High-Speed Data Acquisition |
|---|---|
Use Scenario: Downconverting RF signals in LTE/FDD base stations with 20 MHz channel bandwidth and 12-bit ADC digitization. IC Role / Device Role / Timing Role: ADC driver amplifying and converting single-ended IF outputs (e.g., from quadrature demodulator) to balanced differential inputs. Use Value: 260 MHz bandwidth and –73 dBc IMD3 ensure >72 dB SFDR at 30 MHz IF, meeting 3GPP ACLR requirements without additional filtering. |
Use Scenario: Driving 12-bit, 80-MSps pipeline ADCs in automated test equipment capturing transient waveforms with <100 ns settling. IC Role / Device Role / Timing Role: Precision buffer and level shifter between FPGA DAC outputs and ADC inputs in loopback calibration paths. Use Value: 1800 V/µs slew rate and 100 ns 0.01% settling enable accurate capture of fast edges; VOCM control matches ADC reference for zero-DC-offset acquisition. |
| Active Differential Filtering | Single-Ended to Differential Conversion |
Use Scenario: Implementing 4th-order Chebyshev anti-alias filters before high-speed ADCs in medical ultrasound beamformers. IC Role / Device Role / Timing Role: Active filter stage using THS4505DGNR as gain block with external RC networks to set pole locations. Use Value: Low 8 nV/√Hz input voltage noise and high open-loop gain (>50 dB) maintain filter Q-factor and stopband rejection above 40 MHz. |
Use Scenario: Converting legacy single-ended sensor outputs (e.g., piezoelectric accelerometers) to differential format for noise-immune transmission over PCB traces. IC Role / Device Role / Timing Role: Unity-gain differential driver accepting ground-referenced input and rejecting common-mode EMI on long traces. Use Value: Input CM range extending to VS− (–5.7 V) allows direct interface to 0–5 V sensors without level-shifting circuitry; >70 dB CMRR suppresses board-level noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4504DGNR | Identical pinout and AC specs, but includes functional PD pin (active-low power-down) and higher quiescent current (20–25 mA vs 16–23 mA). | Required where system-level power gating is needed (e.g., battery-powered portable instruments); not drop-in due to PD pin behavior. | Select THS4504DGNR only if power-down control is mandatory; otherwise THS4505DGNR offers lower static power and simpler layout. |
| LMH5401RTVT | Wider 4.2 GHz GBW, higher 3000 V/µs slew rate, but requires external VOCM resistor network and has narrower input CM range (–3.3 V to +1.7 V at ±5 V). | Better suited for >100 MHz IF sampling or JESD204B serializer drivers; less suitable for ground-referenced sensor interfaces. | Choose LMH5401RTVT for ultra-wideband applications beyond 260 MHz; THS4505DGNR remains optimal for cost-sensitive 12-bit ADC driver designs up to 80 MSps. |
Compared with THS4504DGNR and LMH5401RTVT, THS4505DGNR provides the best balance of proven 260 MHz linearity, rail-to-rail input flexibility, and simplified VOCM implementation for mainstream 12-bit data acquisition systems-without requiring power management logic or external bias components.
Availability
THS4505DGNR is available at Aetrix Electronics and suitable for wireless infrastructure, high-speed data acquisition, and medical imaging systems requiring stable component supply, long-term industrial lifecycle support, and traceable sourcing.
Supply support for THS4505DGNR 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-speed amplifier design and manufacturing.
The THS4505DGNR belongs to TI's high-linearity fully differential amplifier product line, engineered specifically for precision ADC driver applications in communications, test equipment, and industrial sensing where distortion, bandwidth, and DC accuracy are critical.
FAQ
What is the function of the PD pin on THS4505DGNR?
The PD (Power-Down) pin on THS4505DGNR is a no-connect (NC) terminal-this variant lacks power-down functionality. Unlike the THS4504, the THS4505DGNR does not respond to PD pin voltage; it must remain unconnected or grounded. This simplifies layout and eliminates power-state control overhead in always-on systems.
Can THS4505DGNR operate from a single 5-V supply?
Yes, THS4505DGNR supports single 5-V operation: connect VS+ to +5 V, VS− to GND, and set VOCM to 2.5 V (e.g., via resistor divider). In this configuration, differential output swing is ±3.3 V into 1 kΩ, and input common-mode range is –0.7 V to +2.6 V-enabling compatibility with ground-referenced sources and 2.5-V ADC references.
How does THS4505DGNR achieve low harmonic distortion at 30 MHz?
THS4505DGNR achieves –73 dBc third-harmonic distortion at 30 MHz through its fully differential topology, which inherently cancels even-order harmonics, combined with optimized internal biasing and high OIP3 (29 dBm). Measured with 2 VPP output into 800 Ω, this performance ensures >70 dB SFDR for 12-bit ADCs operating at 80 MSps without post-processing correction.
What is the recommended PCB layout practice for the PowerPAD™ on THS4505DGNR?
The MSOP-8 PowerPAD™ on THS4505DGNR must be soldered to a solid copper thermal pad connected to PCB ground plane via ≥4 thermal vias (0.3 mm diameter, spaced ≤1 mm apart). This reduces θJA from 58.4°C/W to <45°C/W, preventing junction temperature rise above +125°C during continuous 260 MHz operation at +85°C ambient.
Does THS4505DGNR require external compensation for unity-gain stability?
No, THS4505DGNR is internally compensated for unity-gain stability across all supply voltages (±5 V, ±7.5 V, 5 V, 15 V). Its small-signal frequency response shows no peaking up to 1 GHz, and phase margin exceeds 60° at unity gain-verified in TI's SLOS363D datasheet Figure 22. No external compensation components are needed for G ≥ 1 configurations.
THS4505DGNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 1800V/µs
- Gain Bandwidth Product:
- 210 MHz
- -3db Bandwidth:
- 260 MHz
- Current - Input Bias:
- 4 µA
- Voltage - Input Offset:
- 4 mV
- Current - Supply:
- 16mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 15 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-HVSSOP
THS4505DGNR FAQ
1.How can I place an order for THS4505DGNR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4505DGNR 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 THS4505DGNR reliable?
The price and inventory of THS4505DGNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4505DGNR is usually 5 days.
3.What payment methods are accepted for THS4505DGNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4505DGNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4505DGNR?
THS4505DGNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4505DGNR 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 THS4505DGNR?
For technical support, including THS4505DGNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4505DGNR requirements.
6.How does Aetrix verify that THS4505DGNR is sourced from the original manufacturer or authorized distributors?
All THS4505DGNR 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 THS4505DGNR meets industry standards.
7.What is the process for return or replacement of THS4505DGNR?
All THS4505DGNR units undergo pre-shipment inspection (PSI). If there is an issue with THS4505DGNR, 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 THS4505DGNR part is unused and in its original packaging.
Return procedure for THS4505DGNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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