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Texas Instruments THS4503CDR
- Part No.:
- THS4503CDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4503CDR.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,215
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Product details
Overview
THS4503CDR from Texas Instruments is a high-performance fully differential amplifier optimized for precision signal conditioning in high-speed data acquisition systems. It delivers 370 MHz small-signal bandwidth, 2800 V/µs slew rate, and -95 dBc third-order intermodulation distortion at 30 MHz - enabling 14-bit ADC preamplification up to 40 MHz with centered input common-mode range and output common-mode voltage control (VOCM).
For engineers reviewing the THS4503CDR datasheet, THS4503CDR pinout, THS4503CDR application, or THS4503CDR equivalent, this device is selected for demanding analog front-ends requiring wide bandwidth, ultra-low distortion, rail-to-rail output swing under ±5 V supply, and precise differential signal integrity in wireless receiver chains and active filtering.
Technical Context
The THS4503CDR implements a fully differential architecture with symmetrical input and output stages, supporting both single-ended-to-differential and differential-to-differential conversion. Its VOCM pin enables independent control of output common-mode level without affecting differential gain or linearity.
Unlike the THS4502CDR, the THS4503CDR omits power-down functionality - simplifying biasing and eliminating PD pin routing. It operates across ±5 V, ±7.5 V, or single 5–15 V supplies, with quiescent current ranging from 12 mA (min) to 34 mA (max) depending on supply and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 370 MHz at G = +1, ±5 V supply - supports >100 MSPS sampling with minimal gain roll-off. |
| Slew rate | 2800 V/µs - ensures faithful reproduction of fast transient signals without slewing-induced distortion. |
| IMD3 @ 30 MHz | -95 dBc - enables clean spectral performance in 3G/4G LTE receiver IF stages with 200 kHz tone spacing. |
| OIP3 @ 30 MHz | 51 dBm - provides high dynamic range for handling strong interferers in baseband and IF amplification. |
| Input common-mode range | Centered at mid-supply (±3.4 V min on ±5 V) - simplifies interface with SAR and pipeline ADCs. |
| Differential output swing | ±7.4 V min into 1 kΩ (±5 V supply) - drives ADC inputs directly without level-shifting circuitry. |
| Input voltage noise | 6.8 nV/√Hz - preserves SNR in low-level sensor or RF mixer output amplification. |
Pinout & Package
The THS4503CDR is housed in an 8-pin SOIC (D) package with standard lead pitch and thermal pad-compatible layout. Pin 1 is VIN−; pin 2 is VIN+; pin 3 is VOCM; pin 4 is VS+; pin 5 is VOUT+; pin 6 is PD (no-connect); pin 7 is VS−; pin 8 is VOUT−.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN− / Pin 1 | Inverting input | Accepts differential or single-ended input; referenced to VOCM for common-mode control. |
| VIN+ / Pin 2 | Non-inverting input | Paired with VIN− to define differential input; supports centered VICR extending to rails. |
| VOCM / Pin 3 | Output common-mode control | Sets DC offset of differential outputs; open-circuit defaults to ~0 V (±5 V supply) or 2.5 V (5 V supply). |
| VS+ / Pin 4 | Positive supply | Accepts +5 V to +15 V (single) or +5 V to +7.5 V (dual); requires local 0.1 µF + 10 µF decoupling. |
| VOUT+ / Pin 5 | Positive differential output | Delivers amplified, balanced output; matched impedance critical for maintaining balance error < −58 dB. |
| PD / Pin 6 | Power-down (NC) | No-connect on THS4503CDR; must be left unconnected or tied to VS− per TI design guidelines. |
| VS− / Pin 7 | Negative supply | Accepts −5 V to −15 V (single) or −5 V to −7.5 V (dual); shares ground reference with VOCM path. |
| VOUT− / Pin 8 | Negative differential output | Complementary to VOUT+; differential swing defined relative to VOCM, not supply rails. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential architecture | Eliminates even-order harmonics and common-mode noise; enables true differential signaling to ADCs. |
| Centered input common-mode range | Supports rail-to-rail input operation with ±3.4 V range on ±5 V supply - ideal for interfacing with op-amp-based filters. |
| Output common-mode voltage control (VOCM) | Allows precise alignment of output DC level to ADC reference (e.g., 2.5 V), independent of gain or load. |
| Wide supply voltage range | Operates from ±5 V to ±7.5 V dual or 5 V to 15 V single supply - accommodates legacy and modern mixed-voltage systems. |
| Low harmonic distortion | −97 dBc HD3 at 8 MHz (±5 V) - maintains SFDR > 90 dB for 14-bit converter interfaces. |
Applications
| High Linearity ADC Preamplifier | Wireless Communication Receiver Chain |
|---|---|
Use Scenario: Driving a 14-bit, 80 MSps pipeline ADC in a medical ultrasound digitizer. IC Role / Device Role / Timing Role: Fully differential gain stage converting single-ended transducer amplifier output to matched differential input for ADC. Use Value: 370 MHz bandwidth and −95 dBc IMD3 preserve time-domain fidelity and SNR across full 40 MHz signal band. |
Use Scenario: IF amplification in a 3G/4G LTE basestation receiver after quadrature demodulation. IC Role / Device Role / Timing Role: Differential line driver between IQ demodulator and ADC, rejecting local oscillator feedthrough. Use Value: Centered VICR and VOCM control enable seamless interface with 1.8 V or 2.5 V ADC references while suppressing CM noise. |
| Single-Ended to Differential Conversion | Active Filtering of Differential Signals |
Use Scenario: Converting output of a single-ended RF filter to differential format before ADC sampling. IC Role / Device Role / Timing Role: High-speed buffer with gain = +1, configured as SE-to-DE converter using VOCM to set output common-mode. Use Value: 2800 V/µs slew rate prevents settling errors during fast filter transients; −58 dB output balance error minimizes image rejection loss. |
Use Scenario: Implementing a 2nd-order active bandpass filter in a differential instrumentation front-end. IC Role / Device Role / Timing Role: Core gain block in a fully differential Sallen-Key topology, with VOCM stabilizing filter DC operating point. Use Value: Input impedance >10⁷ Ω || 1 pF avoids loading passive filter components; OIP3 >51 dBm sustains filter linearity under large-signal conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4502CDR | Includes power-down pin (PD); otherwise identical AC/DC specs and pinout except NC on THS4503CDR. | Required where system-level power gating or standby mode is needed; adds complexity in PCB routing and control logic. | Select THS4502CDR only if active power management is mandatory; THS4503CDR reduces BOM count and layout overhead. |
| THS4500IDR | Wider input common-mode range (includes VS−); lower bandwidth (370 MHz same, but 0.1 dB flatness limited to 100 MHz vs 150 MHz). | Better suited for level-shifting applications where input must extend below VS−; less optimal for wideband IF amplification. | Choose THS4500IDR when interfacing with negative-biased sensors or legacy op-amp stages; THS4503CDR preferred for high-fidelity ADC driving. |
Compared with THS4502CDR and THS4500IDR, the THS4503CDR offers the optimal balance of bandwidth, distortion, and simplicity for fixed-gain, always-on differential signal paths - especially where VOCM control and centered VICR are critical for ADC interface integrity.
Availability
THS4503CDR is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless infrastructure, medical imaging, and test equipment requiring stable component supply and guaranteed long-term sourcing.
Supply support for THS4503CDR 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 precision signal chain solutions.
The THS4503CDR belongs to TI's high-linearity fully differential amplifier product line, engineered specifically for 14-bit+ data converter interfaces and RF/IF signal conditioning in communications and instrumentation systems.
FAQ
What is the maximum junction temperature limit for reliable operation of the THS4503CDR?
The THS4503CDR must not exceed +60°C junction temperature to prevent low-level oscillation. Operation above this threshold is not recommended for new designs. Thermal design must ensure θJA and board copper area keep TJ ≤ 60°C under worst-case load and ambient conditions. The THS4503CDR datasheet specifies 125°C as maximum continuous-reliability junction temperature, but oscillation risk begins at 60°C.
Can the THS4503CDR operate from a single 5-V supply, and what is its output swing in that configuration?
Yes, the THS4503CDR supports single 5-V operation with VOCM set to 2.5 V. In this mode, differential output swing is ±2.6 V minimum into 1 kΩ (referenced to 2.5 V), delivering 5.2 VPP usable amplitude - sufficient to drive most 12–14-bit ADCs with 2.5 V reference. Quiescent current drops to 10–20 mA, reducing power dissipation.
How does the VOCM pin function on the THS4503CDR, and what happens if it is left unconnected?
The VOCM pin sets the DC common-mode level of both VOUT+ and VOUT− outputs. When left floating on ±5 V supply, VOCM defaults to ~0 V (±0.1 V max); on 5 V supply, it defaults to ~2.5 V (±0.1 V). For precise control, VOCM should be driven by a low-impedance source (e.g., DAC or resistor divider), as its input impedance is 25 kΩ || 1 pF and bias current is ≤3 µA at 2.5 V.
Is the THS4503CDR pin-compatible with the THS4502CDR, and what is the key functional difference?
Yes, the THS4503CDR is pin-compatible with the THS4502CDR in the same SOIC-8 (D) package. The sole functional difference is that Pin 6 (PD) is no-connect on THS4503CDR, whereas it enables power-down on THS4502CDR. No PCB changes are required when substituting THS4503CDR for THS4502CDR in non-power-gated designs.
What is the typical third-order output intercept point (OIP3) of the THS4503CDR, and at what frequency is it specified?
The THS4503CDR delivers a typical OIP3 of 51 dBm at 30 MHz under ±5 V supply, Rf = 392 Ω, and 2 VPP differential output. This value is measured referenced to 50 Ω and confirms high linearity for IF amplification in cellular and broadband receiver applications where adjacent-channel interference rejection is critical.
THS4503CDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 2800V/µs
- Gain Bandwidth Product:
- 300 MHz
- -3db Bandwidth:
- 370 MHz
- Current - Input Bias:
- 4 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 23mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 15 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS4503CDR FAQ
1.How can I place an order for THS4503CDR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4503CDR 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 THS4503CDR reliable?
The price and inventory of THS4503CDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4503CDR is usually 5 days.
3.What payment methods are accepted for THS4503CDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4503CDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4503CDR?
THS4503CDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4503CDR 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 THS4503CDR?
For technical support, including THS4503CDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4503CDR requirements.
6.How does Aetrix verify that THS4503CDR is sourced from the original manufacturer or authorized distributors?
All THS4503CDR 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 THS4503CDR meets industry standards.
7.What is the process for return or replacement of THS4503CDR?
All THS4503CDR units undergo pre-shipment inspection (PSI). If there is an issue with THS4503CDR, 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 THS4503CDR part is unused and in its original packaging.
Return procedure for THS4503CDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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