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Texas Instruments VCA2612Y/2K
- Part No.:
- VCA2612Y/2K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 48-TQFP
- Datasheet:
-
VCA2612Y/2K.pdf
- Description:
- IC VARIABLE GAIN 2 CIRC 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,373
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Product details
Overview
VCA2612Y/2K from Texas Instruments is a dual-channel, highly integrated variable gain amplifier with low-noise preamplifier (LNP) per channel, delivering 1.25nV/√Hz input noise at 25dB LNP gain and 3.3nV/√Hz differential VCA noise, 80MHz LNP bandwidth, 40MHz VCA bandwidth, and differential I/O for ultrasound receive chains.
For engineers reviewing the VCA2612Y/2K datasheet, VCA2612Y/2K pinout, VCA2612Y/2K application, or VCA2612Y/2K equivalent, key selection criteria include LNP gain strap programmability (5/17/22/25dB), MGS-selectable maximum VCA+PGA gain (24–45dB), analog VCACNTL control linearity (10.9dB/V), crosstalk performance (68dB at 1MHz), and TQFP-48 thermal resistance (56.5°C/W).
Technical Context
The VCA2612Y/2K integrates two independent signal paths, each comprising a switchable-termination low-noise preamplifier (LNP) followed by a voltage-controlled attenuator (VCA) and programmable gain amplifier (PGA). The LNP accepts single-ended or differential inputs and delivers differential outputs with strappable gains of 5dB, 17dB, 22dB, or 25dB via LNPGS pins.
The VCA section uses analog VCACNTL (0.2–3.0V) to set attenuation while MGS bits (pins 40–42) configure maximum composite gain (24–45dB); combined VCA+PGA gain ranges from 18dB to 53dB depending on VCACNTL and MGS settings, with group delay variation ±2ns across 1–10MHz full gain range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LNP Input Noise | 1.25nV/√Hz at 25dB gain - enables high-SNR reception in low-amplitude ultrasound echoes |
| VCA Input Noise | 3.3nV/√Hz differential - maintains signal integrity through variable gain stage without degrading NF |
| LNP Bandwidth | 80MHz at 22dB gain - supports wideband medical imaging up to 15MHz fundamental frequencies |
| VCA Bandwidth | 40MHz - ensures flat response for baseband and IF signals in wireless receivers |
| Crosstalk | 68dB at 1MHz, max gain - prevents inter-channel interference in dual-beam ultrasound systems |
| Gain Control Slope | 10.9dB/V - provides precise, predictable analog gain adjustment over 0.2–3.0V VCACNTL range |
| Power Dissipation | 410–495mW (both channels) - requires thermal design consideration in dense PCB layouts |
| Supply Voltage | 4.75–5.25V - compatible with standard +5V analog rails; separate VDDA/VDDB/GNDA/GNDB reduce inter-channel coupling |
Pinout & Package
TQFP-48 package with exposed thermal pad; 7mm × 7mm footprint, 0.5mm pitch, JEDEC MO-220 compliant; thermal resistance θJA = 56.5°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCAINPA / VCAINNA | Channel A VCA differential input | Accepts LNP output or external signal; common-mode level must be 2.5V for optimal distortion |
| LNPOUTPA / LNPOUTNA | Channel A LNP differential output | Drives VCA directly or external circuitry; 2VPP differential swing capability |
| LNPGS1A–LNPGS3A | LNP gain strap inputs | Set LNP gain to 5/17/22/25dB via binary coding; internal resistor ladder with ±0.5% matching |
| MGS1–MGS3 | Maximum gain select bits | Program VCA+PGA peak gain from 24dB to 45dB in 3dB steps; shared across both channels |
| VCACNTL | Analog gain control voltage | 0.2–3.0V linear-in-dB control; 0.2µs response for 45dB gain change |
| FBA / SWFBA | LNP feedback terminals | Enable active termination with external resistor; reduces noise figure up to 4.6dB vs passive termination |
Key Features
| Feature | Design Value |
|---|---|
| Active termination support | Reduces system noise figure up to 4.6dB by eliminating shunt-resistor thermal noise in cable interfaces |
| Dual independent channels | Separate power supplies (VDDA/VDDB), grounds (GNDA/GNDB), and reference (VDDR/GNDR) minimize inter-channel crosstalk |
| Strappable LNP gain | Four factory-trimmed gain options (5/17/22/25dB) with ±0.5% resistor matching over temperature and process |
| DC-coupled LNP-to-VCA path | 2.5V common-mode output from LNP matches VCA input requirement - eliminates AC coupling capacitors and associated phase shift |
| Overload recovery circuit | Clips symmetrically during PGA overload and substitutes fixed DC level - prevents long recovery tails in burst-mode ultrasound |
| Frequency compensation pins | COMP1A/COMP2A allow external capacitor tuning to stabilize gain peaking at high frequencies |
Applications
| Ultrasound Beamforming | Wireless Baseband Receiver |
|---|---|
Use Scenario: Dual-channel echo signal conditioning in portable ultrasound transceivers with 3–15MHz probe bandwidth. IC Role / Device Role / Timing Role: LNP amplifies weak transducer return signals with <1.25nV/√Hz noise; VCA dynamically adjusts gain per scan line to compensate for depth-dependent attenuation. Use Value: Enables >120dB dynamic range with 68dB inter-channel isolation, supporting real-time B-mode and Doppler processing. | Use Scenario: I/Q baseband amplification in zero-IF LTE/FDD receivers with variable channel SNR. IC Role / Device Role / Timing Role: Dual-channel VGA processes quadrature signals; MGS and VCACNTL jointly optimize noise figure and linearity across RF gain stages. Use Value: Delivers –71dBc third-harmonic distortion at 5MHz and 1VPP output, meeting LTE ACLR requirements without digital correction. |
| High-Speed Test Equipment | Medical Imaging Signal Chain |
Use Scenario: Programmable gain front-end in automated test equipment for characterizing RF components. IC Role / Device Role / Timing Role: Replaces discrete op-amp + attenuator combinations; LNP provides calibrated low-noise input, VCA enables rapid gain sweeps. Use Value: 0.2µs gain settling time and ±1dB gain error enable sub-millisecond calibration sequences with traceable accuracy. | Use Scenario: Analog signal conditioning in MRI gradient amplifier monitoring and PET detector readout. IC Role / Device Role / Timing Role: Processes low-level sensor outputs requiring wide dynamic range and minimal added noise; differential I/O rejects EMI in high-field environments. Use Value: 50dB CMRR at 1MHz and 56.5°C/W thermal resistance ensure stable operation in thermally constrained medical enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8367ARUZ | Single-channel, 45dB gain range, 750MHz bandwidth, no integrated LNP; 50Ω input impedance | Requires external LNA for low-noise ultrasound front-end; better suited for RF IF gain control than baseband beamforming | Select when ultra-wide bandwidth (>100MHz) is prioritized over dual-channel integration and active termination |
| VCA2615Y/2K | Pin-compatible upgrade with improved 0.95nV/√Hz LNP noise, 100MHz LNP bandwidth, and enhanced IMD performance | Direct drop-in replacement for new designs targeting higher sensitivity; same TQFP-48 footprint and pinout | Choose for next-generation ultrasound systems requiring lower noise floor without layout changes |
Compared with AD8367ARUZ, VCA2612Y/2K provides integrated dual-channel architecture and active termination for medical imaging, whereas AD8367ARUZ offers wider bandwidth for RF applications; compared with VCA2615Y/2K, VCA2612Y/2K has higher LNP noise but broader legacy design support and lower cost.
Availability
VCA2612Y/2K is available at Aetrix Electronics and suitable for ultrasound systems, wireless baseband receivers, and high-speed test equipment requiring stable component supply, consistent parametric performance, and long-term industrial availability.
Supply support for VCA2612Y/2K 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-performance signal chain ICs.
The VCA2612Y/2K belongs to TI's precision analog VGA product line, designed specifically for medical ultrasound, communications, and instrumentation applications demanding ultra-low noise, high linearity, and dual-channel synchronization.
FAQ
What is the maximum differential output swing of the VCA2612Y/2K?
The VCA2612Y/2K delivers up to 2VPP differential output swing into ≥500Ω load per side. This is specified under conditions of RL ≥ 500Ω each side to ground, with typical performance maintained across the full 18–53dB gain range and VCACNTL 0.2–3.0V. Exceeding this swing risks clipping in the PGA stage, especially at higher gains.
How does active termination reduce noise figure in the VCA2612Y/2K LNP?
Active termination in the VCA2612Y/2K replaces passive shunt resistors with controlled feedback, eliminating thermal noise from termination resistance. When configured using FB and SWFB pins with external resistors, it improves system noise figure by up to 4.6dB versus conventional 75Ω termination - critical for detecting weak ultrasound echoes without sacrificing bandwidth.
Can the VCA2612Y/2K operate with single-ended inputs and outputs?
Yes, the VCA2612Y/2K supports single-ended operation: the LNP accepts single-ended inputs (e.g., from coaxial probes), and the VCA outputs can be used single-ended with 6dB amplitude reduction versus differential mode. However, differential operation is recommended for best CMRR (>50dB at 1MHz) and harmonic distortion performance.
What is the purpose of the MGS1–MGS3 pins on the VCA2612Y/2K?
The MGS1–MGS3 pins on the VCA2612Y/2K configure the maximum composite gain of the VCA+PGA block, selecting from eight options: 24dB, 27dB, 30dB, 33dB, 36dB, 39dB, 42dB, or 45dB. These bits are shared between both channels and determine the upper limit of the swept-gain curve defined by VCACNTL voltage.
Does the VCA2612Y/2K include internal power supply regulation?
Yes, the VCA2612Y/2K includes an internal regulated reference supplied by VDDR/GNDR pins, providing stable biasing for critical analog blocks. This dedicated reference rail reduces sensitivity to analog supply ripple and improves PSRR by >45dB at 1MHz, enhancing noise immunity in mixed-signal systems where VDDA/VDDB may carry switching noise.
VCA2612Y/2K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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)
VCA2612Y/2K FAQ
1.How can I place an order for VCA2612Y/2K through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA2612Y/2K 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 VCA2612Y/2K reliable?
The price and inventory of VCA2612Y/2K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA2612Y/2K is usually 5 days.
3.What payment methods are accepted for VCA2612Y/2K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA2612Y/2K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA2612Y/2K?
VCA2612Y/2K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA2612Y/2K 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 VCA2612Y/2K?
For technical support, including VCA2612Y/2K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA2612Y/2K requirements.
6.How does Aetrix verify that VCA2612Y/2K is sourced from the original manufacturer or authorized distributors?
All VCA2612Y/2K 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 VCA2612Y/2K meets industry standards.
7.What is the process for return or replacement of VCA2612Y/2K?
All VCA2612Y/2K units undergo pre-shipment inspection (PSI). If there is an issue with VCA2612Y/2K, 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 VCA2612Y/2K part is unused and in its original packaging.
Return procedure for VCA2612Y/2K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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