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Texas Instruments VCA2616YT
- Part No.:
- VCA2616YT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 48-TQFP
- Datasheet:
-
VCA2616YT.pdf
- Description:
- IC VARIABLE GAIN 2 CIRC 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,689
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Product details
Overview
VCA2616YT from Texas Instruments is a dual-channel, low-noise variable-gain amplifier with integrated preamplifier, designed for high-fidelity signal conditioning in ultrasound front-ends and RF receiver chains. It delivers 0.95nV/√Hz input-referred noise at 25dB LNP gain, 80MHz preamp bandwidth, 40MHz VCA bandwidth, differential I/O, and 5–25dB programmable LNP gain with active termination.
For engineers reviewing the VCA2616YT datasheet, VCA2616YT pinout, VCA2616YT application, or VCA2616YT equivalent, this device supports critical low-noise analog signal paths requiring precise gain control, crosstalk isolation >66dB, and fast 0.2µs response to 40dB gain changes - especially where input spike tolerance (–0.3V) and TQFP-48 thermal performance are design constraints.
Technical Context
The VCA2616YT integrates two independent signal chains, each comprising a low-noise preamplifier (LNP), voltage-controlled attenuator (VCA), and programmable gain amplifier (PGA). Its LNP uses active feedback termination to achieve 6.2dB noise figure at 75Ω source impedance and supports four pin-strapped gains (5/17/22/25dB) via LNPGS1–3 pins.
The VCA stage provides 0–40dB analog-controlled gain (via VCACNTL, 0.2–3.0V) with ±1dB gain error and linear-in-dB response, while the PGA scales total system gain up to 53dB (MGS=111, VCACNTL=3.0V). Both channels share MGS bits and VCACNTL but operate with <0.26dB interchannel gain mismatch and –66dB crosstalk at 5MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Noise Density | 0.95nV/√Hz at 25dB LNP gain - enables detection of weak signals in medical ultrasound beamforming |
| LNP Bandwidth | 80MHz at 22dB gain - supports wideband RF/IF signal acquisition without roll-off in test equipment |
| VCA Bandwidth | 40MHz - maintains fidelity across full 40dB gain range for dynamic signal envelopes |
| Crosstalk | –66dB at 5MHz - ensures channel isolation in dual-channel ultrasound receive paths |
| Gain Control Range | 0–40dB via 0.2–3.0V VCACNTL - allows real-time AGC with 10.9dB/V slope and ±1dB accuracy |
| Response Time | 0.2µs for 40dB gain step - meets fast envelope tracking requirements in pulsed systems |
| Supply Voltage | +4.75V to +5.25V - compatible with standard 5V analog rails and low-noise LDO regulation |
Pinout & Package
TQFP-48 package (PFB designation), 7mm × 7mm, 0.5mm pitch, exposed thermal pad, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA / VDDB | Channel A/B analog supply | Independent 5V rails minimize interchannel coupling; requires local 0.1µF + 10µF bypassing |
| LNPINPA / LNPINNA | Channel A LNP noninverting/inverting input | Differential input pair supporting active termination via external FB resistor; –0.3V absolute min input |
| LNPOUTPA / LNPOUTNA | Channel A LNP differential output | Drives VCA directly or external circuitry; 2.5V common-mode level matches VCAIN input requirement |
| VCACNTL | VCA control voltage input | Analog gain control pin (0.2–3.0V); 1MΩ input resistance enables simple DAC or op-amp interface |
| MGS1–MGS3 | Maximum gain select bits | 3-bit logic interface setting peak VCA×PGA gain (24–45dB); shared across both channels |
| VCAOUTPA / VCAOUTNA | Channel A VCA differential output | Capable of 2VPP swing into ≥500Ω load; cleanly limited for overdrive recovery in ADC interfaces |
Key Features
| Feature | Design Value |
|---|---|
| Active Termination Noise Reduction | Improves noise figure by up to 4.6dB vs. shunt termination - critical for 75Ω cable-driven ultrasound probes |
| Switchable LNP Termination Value | Four pin-strapped gains (5/17/22/25dB) via LNPGS1–3 - eliminates need for external gain-setting resistors |
| Dual-Channel Gain Matching | ±0.26dB gain delta between channels at 0.2V VCACNTL - enables coherent beamforming without calibration |
| Integrated Reference & Bias | VCM (2.5V) and VBIAS outputs - simplify single-supply design and ensure consistent common-mode levels |
| Overload Recovery Protection | Symmetric clipping + comparator-based DC substitution - prevents distortion hangover during pulsed echo reception |
Applications
| Ultrasound Beamforming | Wireless IF Receiver |
|---|---|
Use Scenario: Amplifying weak echo signals from piezoelectric transducer arrays with time-varying gain compensation. IC Role / Device Role / Timing Role: Dual-channel LNP+VCA front-end providing programmable gain, active termination, and low-noise amplification per channel. Use Value: 0.95nV/√Hz noise density and –66dB crosstalk preserve SNR and spatial resolution in phased-array imaging. | Use Scenario: Digitizing downconverted RF signals in wideband SDR receivers with automatic gain control. IC Role / Device Role / Timing Role: Variable-gain IF amplifier driving high-speed ADCs with differential output and fast AGC response. Use Value: 0.2µs 40dB gain step and 40MHz bandwidth support real-time envelope tracking of burst-mode signals. |
| High-Fidelity Test Equipment | Medical Signal Acquisition |
Use Scenario: Precision signal conditioning in modular oscilloscopes and spectrum analyzers requiring calibrated gain steps. IC Role / Device Role / Timing Role: Dual-channel programmable gain block with traceable 10.9dB/V gain slope and ±1dB linearity. Use Value: MGS-programmable peak gain (24–45dB) and VCACNTL-controlled fine adjustment enable flexible dynamic range scaling. | Use Scenario: Low-noise amplification of biopotential signals (ECG, EEG) with adaptive gain for varying electrode contact impedance. IC Role / Device Role / Timing Role: Preamp + VGA stage with active termination and 2.5V common-mode output for single-supply ADC interfacing. Use Value: 600kΩ unterminated input impedance and 15pF input capacitance reduce loading on high-Z sensor interfaces. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable-gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VCA2611YT | Upgraded LNP input tolerance: –2.0V vs. –0.3V for VCA2616YT; identical pinout, gain specs, and noise performance | Enables use of slower/cheaper clamping diodes; suitable where input transient protection is critical | Select VCA2611YT when negative input spikes exceed –0.3V or clamping diode cost is a constraint |
| AD8367ARUZ | Single-channel, 45dB gain range, 750MHz bandwidth; no integrated LNP; 1.6nV/√Hz noise at max gain | Higher bandwidth but higher noise and no active termination; requires external preamp for low-noise front-end | Choose AD8367ARUZ for RF applications >100MHz where VCA2616YT's 40MHz VCA bandwidth is limiting |
Compared with VCA2616YT, VCA2611YT offers improved input ruggedness without trade-offs in noise or gain control, while AD8367ARUZ trades lower noise and integrated preamp functionality for wider bandwidth and single-channel simplicity - making VCA2616YT optimal for dual-channel, ultra-low-noise, moderate-bandwidth medical and test systems.
Availability
VCA2616YT is available at Aetrix Electronics and suitable for ultrasound systems, wireless receivers, and test equipment requiring stable component supply, dual-channel coherence, and guaranteed TQFP-48 packaging.
Supply support for VCA2616YT 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 precision amplifiers and signal chain solutions.
The VCA2616YT belongs to TI's high-performance variable-gain amplifier product line, engineered specifically for medical imaging, communications infrastructure, and instrumentation where low noise, gain accuracy, and channel matching are mission-critical.
FAQ
What is the maximum input voltage rating for the LNP inputs of the VCA2616YT?
The VCA2616YT LNP inputs (LNPINPA/LNPINNA) are rated for –0.3V to (+VS + 0.3V) under absolute maximum conditions. This –0.3V negative-going limit distinguishes it from the VCA2611YT (–2.0V), and informs clamp diode selection in front-end protection circuits. Exceeding –0.3V risks damage to the VCA2616YT input stage.
How does active termination improve noise performance in the VCA2616YT?
Active termination in the VCA2616YT replaces passive shunt resistors with controlled feedback, reducing theoretical noise figure degradation from 3dB to near zero. At 75Ω source impedance and 22dB LNP gain, this yields a measured 6.2dB noise figure - a 4.6dB improvement over conventional termination - directly enhancing SNR in ultrasound and RF receive paths.
Can the VCA2616YT drive a 50Ω ADC input directly?
No - the VCA2616YT VCA outputs (VCAOUTPA/VCAOUTNA) are specified for loads ≥500Ω to ground per side. Driving a 50Ω load would violate output current limits (±40mA short-circuit rating) and degrade distortion and bandwidth. A 1:4 transformer or buffer amplifier is required for 50Ω ADC interfacing.
What is the purpose of the VCM pin (pin 19) on the VCA2616YT?
The VCM pin provides a stable 2.5V reference output used to bias the common-mode level of external signal sources feeding the VCA inputs. It matches the internal 2.5V common-mode level of the LNP outputs, enabling direct AC-coupled connection without level-shifting. A 0.01µF capacitor to ground is required for stability.
Does the VCA2616YT support single-ended input and output configurations?
Yes - while optimized for differential operation, the VCA2616YT supports single-ended inputs (e.g., via LNPINPA only with LNPINNA grounded) and single-ended outputs (e.g., VCAOUTPA only). However, differential mode delivers superior 2nd-harmonic distortion rejection and 6dB higher signal amplitude, so single-ended use incurs measurable SNR and linearity penalties.
VCA2616YT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 2
- Output Type:
- Differential
- Slew Rate:
- 300V/µs
- Gain Bandwidth Product:
- 80 MHz
- -3db Bandwidth:
- 40 MHz
- Current - Input Bias:
- 1 nA
- Voltage - Input Offset:
- -
- Current - Supply:
- -
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 4.75 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFP (7x7)
VCA2616YT FAQ
1.How can I place an order for VCA2616YT through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA2616YT 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 VCA2616YT reliable?
The price and inventory of VCA2616YT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA2616YT is usually 5 days.
3.What payment methods are accepted for VCA2616YT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA2616YT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA2616YT?
VCA2616YT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA2616YT 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 VCA2616YT?
For technical support, including VCA2616YT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA2616YT requirements.
6.How does Aetrix verify that VCA2616YT is sourced from the original manufacturer or authorized distributors?
All VCA2616YT 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 VCA2616YT meets industry standards.
7.What is the process for return or replacement of VCA2616YT?
All VCA2616YT units undergo pre-shipment inspection (PSI). If there is an issue with VCA2616YT, 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 VCA2616YT part is unused and in its original packaging.
Return procedure for VCA2616YT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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