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Texas Instruments THS4505DGK
- Part No.:
- THS4505DGK
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
THS4505DGK.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,388
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Product details
Overview
THS4505DGK from Texas Instruments is a high-performance, fully differential amplifier optimized for driving 12-bit, 80-MSps analog-to-digital converters (ADCs) in high-fidelity signal chains. It delivers 260 MHz small-signal bandwidth, –73 dBc third-order intermodulation distortion at 30 MHz, and 1800 V/µs slew rate under ±5 V supply, enabling precise single-ended-to-differential conversion in wireless receiver front-ends.
For engineers reviewing the THS4505DGK datasheet, THS4505DGK pinout, THS4505DGK application, or THS4505DGK equivalent, this page provides verified specifications, package-validated pin functions, real-world use scenarios in ADC interface and active filtering, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The THS4505DGK implements a fully differential architecture with independent output common-mode voltage control via VOCM pin, supporting precise DC-coupled interfacing to ADC inputs. Its input common-mode range extends to the negative rail (–5.7 V at ±5 V supply), enabling direct connection to ground-referenced sensors or DAC outputs without level-shifting.
It features a high-speed, low-distortion transconductance stage followed by a class-AB output buffer, delivering ±8 V differential swing into 1 kΩ load and maintaining >–65 dB output balance error up to 100 kHz. 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): supports wideband IF sampling up to 125 MHz Nyquist zone. |
| Slew rate | 1800 V/µs (±5 V): enables clean 2 VPP step response with <1 ns rise/fall time for fast transient fidelity. |
| IMD3 distortion | –73 dBc at 30 MHz, 200 kHz tone spacing: meets linearity requirements for LTE/WiMAX baseband receivers. |
| OIP3 | 29 dBm at 30 MHz (50 Ω referenced): ensures robust dynamic range in high-interference RF front-ends. |
| Input voltage noise | 8 nV/√Hz (>1 MHz): minimizes added noise when amplifying low-level sensor or mixer outputs. |
| Quiescent current | 25 mA max (±5 V, +85°C): balances performance and thermal dissipation in compact MSOP-8 layout. |
| Common-mode input range | –5.7 V to +2.6 V (±5 V): allows direct interface to unipolar or bipolar sources without external biasing. |
Pinout & Package
THS4505DGK is housed in an 8-pin MSOP (Mini Small Outline Package) with exposed thermal pad (PowerPAD™), optimized for high-frequency stability and thermal management in space-constrained PCBs. Pin numbering follows standard top-view orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN− | Inverting input | Differential input node; accepts complementary signal or feedback path in inverting configuration. |
| VIN+ | Non-inverting input | Differential input node; used for single-ended-to-differential conversion when VIN− is grounded or biased. |
| VOCM | Output common-mode control | DC voltage setting point for VOUT+ and VOUT− average; sets ADC reference midpoint (e.g., 2.5 V for 5 V supply). |
| VS+ | Positive supply | Accepts +5 V, +12 V, or +15 V single supply or +5 V/+7.5 V dual supply; decoupling required per datasheet. |
| VOUT+ | Positive differential output | Drives ADC's AIN+ or filter network; maintains tight amplitude/phase match with VOUT−. |
| VS− | Negative supply | Required for dual-supply operation (e.g., –5 V); tied to GND for single-supply mode (5 V). |
| VOUT− | Negative differential output | Complementary output to VOUT+; balance error ≤–65 dB ensures <0.05% amplitude mismatch at baseband. |
| PD | Power-down (No Connect) | NC on THS4505 - no internal connection; must be left floating or tied to VS− to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential architecture | Rejects even-order harmonics and common-mode noise, improving SNR in mixed-signal systems. |
| Output common-mode control (VOCM) | Enables precise DC alignment to ADC input range without external resistive dividers or op-amps. |
| Input common-mode range includes VS− | Supports ground-referenced inputs (e.g., from DACs or sensors) without level-shifting circuitry. |
| Wide supply range (±5 V to ±7.5 V / 5 V to 15 V) | Allows reuse across multiple system rails - e.g., ±5 V for test equipment, +12 V for industrial data acquisition. |
| 260 MHz bandwidth & –73 dBc IMD3 | Meets ENOB >11.5 bits at 30 MHz input for 12-bit ADCs like ADS5463 or AD9434. |
Applications
| Wireless Baseband Receiver | High-Speed Data Acquisition |
|---|---|
Use Scenario: Amplifying I/Q signals from quadrature demodulator before digitization in LTE femtocell receiver. IC Role / Device Role / Timing Role: Single-ended-to-differential converter and anti-alias filter driver for 80-MSps ADC. Use Value: –73 dBc IMD3 at 30 MHz preserves EVM <2.5% in 20-MHz LTE channel; VOCM pin aligns output to ADC mid-scale. |
Use Scenario: Driving 12-bit, 80-MSps ADC in automated test equipment capturing transient waveforms. IC Role / Device Role / Timing Role: High-fidelity differential line driver with 260 MHz bandwidth for full-scale step response. Use Value: 1800 V/µs slew rate ensures <100 ns settling to 0.01% for 4 VPP steps, minimizing aperture jitter-induced ENOB loss. |
| Active Differential Filter Stage | Instrumentation Signal Conditioning |
Use Scenario: Implementing 2nd-order MFB bandpass filter centered at 15 MHz with gain = 2 in spectrum analyzer front-end. IC Role / Device Role / Timing Role: Active filter core with matched output impedance and low group delay variation. Use Value: Output balance error ≤–65 dB maintains phase coherence between VOUT+ and VOUT−, preserving filter Q-factor. |
Use Scenario: Isolating and scaling low-amplitude sensor outputs (e.g., piezoelectric accelerometer) before ADC. IC Role / Device Role / Timing Role: Low-noise, rail-to-rail input amplifier with VOCM-adjustable output common-mode. Use Value: 8 nV/√Hz input voltage noise dominates over ADC quantization noise up to 100 kHz, maximizing dynamic range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4504DGK | Identical pinout and AC specs, but adds PD pin with 800 µA power-down current; quiescent current rises to 25 mA max (vs. THS4505's 25 mA max). | Required where system-level power gating is needed (e.g., battery-powered portable instruments). | Select THS4504DGK only if power-down functionality is mandatory; THS4505DGK offers identical performance with simpler biasing. |
| LMH5401RTVT | Higher 1.2 GHz bandwidth, 3000 V/µs slew rate, but higher 25 mA quiescent current and no VOCM pin - output common-mode fixed at VCC/2. | Suitable for >100 MHz IF sampling, but requires external level-shifting for non-VCC/2 ADC references. | Choose LMH5401RTVT for ultra-wideband applications beyond 260 MHz; THS4505DGK remains optimal for 12-bit, 80-MSps ADC interfaces with VOCM flexibility. |
Compared with THS4504DGK, THS4505DGK eliminates power-down complexity while retaining identical linearity and bandwidth - ideal for always-on instrumentation. Versus LMH5401RTVT, THS4505DGK trades bandwidth for VOCM control and lower distortion at 30 MHz, better matching 12-bit ADC interface requirements.
Availability
THS4505DGK is available at Aetrix Electronics and suitable for wireless infrastructure, high-speed data acquisition, and precision instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for THS4505DGK 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 signal chain solutions.
The THS4505 belongs to TI's high-linearity, fully differential amplifier product line, engineered specifically for driving high-resolution ADCs in communications, test equipment, and medical imaging systems.
FAQ
What is the maximum supply voltage for THS4505DGK?
The absolute maximum supply voltage for THS4505DGK is ±7.5 V for dual supply or 15 V for single supply, per the Absolute Maximum Ratings table. Operation beyond these limits risks permanent damage. For reliable 12-bit ADC interface performance, TI specifies ±5 V or 5 V operation as nominal - delivering optimal distortion and bandwidth while staying within thermal limits of the MSOP-8 PowerPAD package.
Does THS4505DGK support single-supply operation?
Yes, THS4505DGK supports true single-supply operation from 4.5 V to 15 V. When using 5 V supply, VS− is connected to ground, VOCM is typically biased to 2.5 V, and the input common-mode range shifts to –0.7 V to +2.6 V - allowing compatibility with ground-referenced sources. The datasheet confirms 210 MHz small-signal bandwidth and –72 dBc IMD3 under 5 V conditions, making it viable for portable and low-voltage systems.
What is the function of the PD pin on THS4505DGK?
The PD (Power-Down) pin on THS4505DGK is a No Connect (NC) terminal - it has no internal connection and must not be driven. This distinguishes THS4505DGK from THS4504DGK, which uses PD for enable/disable control. Leaving PD floating or tying it to VS− avoids parasitic coupling; routing it to any active voltage violates the "NC" designation and may degrade noise or stability performance.
How does VOCM pin affect THS4505DGK output behavior?
The VOCM pin directly sets the average DC voltage of VOUT+ and VOUT−, enabling precise alignment to an ADC's input common-mode requirement (e.g., 2.5 V for a 5 V-supplied ADC). With VOCM = 2.5 V, THS4505DGK delivers symmetrical ±3.3 V differential swing (6.6 VPP) into 1 kΩ. Its VOCM control loop maintains <1 mV offset error and supports 200 MHz small-signal bandwidth, ensuring dynamic common-mode tracking during fast signal transitions.
Is THS4505DGK pin-compatible with other devices in the THS450x family?
Yes, THS4505DGK shares identical 8-pin MSOP (DGK) pinout with THS4504DGK, THS4502DGK, and THS4503DGK - including VIN−, VIN+, VOCM, VS+, VOUT+, VS−, VOUT−, and PD/NC positions. However, THS4502/THS4503 feature centered input common-mode range (not rail-to-rail), and THS4504 includes functional PD logic. Thus, while physically interchangeable, electrical behavior differs - THS4505DGK is not a drop-in replacement without verifying VOCM and input range compatibility.
THS4505DGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- 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:
- 130 mA
- 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-VSSOP
THS4505DGK FAQ
1.How can I place an order for THS4505DGK through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4505DGK 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 THS4505DGK reliable?
The price and inventory of THS4505DGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4505DGK is usually 5 days.
3.What payment methods are accepted for THS4505DGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4505DGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4505DGK?
THS4505DGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4505DGK 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 THS4505DGK?
For technical support, including THS4505DGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4505DGK requirements.
6.How does Aetrix verify that THS4505DGK is sourced from the original manufacturer or authorized distributors?
All THS4505DGK 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 THS4505DGK meets industry standards.
7.What is the process for return or replacement of THS4505DGK?
All THS4505DGK units undergo pre-shipment inspection (PSI). If there is an issue with THS4505DGK, 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 THS4505DGK part is unused and in its original packaging.
Return procedure for THS4505DGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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