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Texas Instruments VCA2612Y-1/2K
- Part No.:
- VCA2612Y-1/2K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 48-TQFP
- Datasheet:
-
VCA2612Y-1/2K.pdf
- Description:
- IC VARIABLE GAIN 2 CIRC 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,983
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Product details
Overview
VCA2612Y-1/2K from Texas Instruments is a dual-channel, highly integrated variable gain amplifier subsystem comprising a low-noise preamplifier (LNP) and a voltage-controlled attenuator + programmable gain amplifier (VCA+PGA) per channel. It delivers 1.25nV/√Hz input-referred noise at 22dB LNP gain, 40MHz VCA bandwidth, differential I/O, and 24dB–45dB total VGA gain range. It is engineered for ultrasound receive chains requiring ultra-low noise, high channel isolation, and precise analog gain control.
For engineers reviewing the VCA2612Y-1/2K datasheet, VCA2612Y-1/2K pinout, VCA2612Y-1/2K application, or VCA2612Y-1/2K equivalent, key selection criteria include input noise density vs. gain setting, crosstalk performance at 5MHz, MGS-programmable maximum gain, active termination compatibility, and differential output drive capability into 500Ω loads.
Technical Context
The VCA2612Y-1/2K implements a two-stage signal path per channel: an LNP with switchable 5/17/22/25dB gain and active termination support via FB/SWFB pins, followed by a cascaded VCA (analog-controlled attenuation) and PGA (digital MGS-selectable gain). The VCA gain slope is 10.9dB/V, with response time of 0.2µs for 45dB gain change.
Both channels share a common VCA control voltage (VCACNTL), but feature independent LNP gain straps (LNPGS1–3), feedback paths (FBA/FBB, SWFBA/SWFBB), and maximum gain select bits (MGS1–3). The device uses separate analog supplies (VDDA/VDDB), reference supply (VDDR), and ground domains to minimize inter-channel crosstalk (68dB typical at 1MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LNP Input Noise | 1.25nV/√Hz at 22dB gain - enables sub-6dB noise figure with 75Ω source in ultrasound front-ends. |
| VCA Bandwidth | 40MHz - supports wideband RF/IF signals up to 10MHz fundamental with ≤1dB flatness. |
| Total Gain Range | 18dB to 53dB (VCACNTL = 0.2V to 3.0V, MGS = 000 to 111) - provides >35dB dynamic range for echo amplitude compensation. |
| Crosstalk | 68dB at 1MHz, max gain - ensures channel-to-channel signal integrity in multi-beam ultrasound beamforming. |
| Power Supply | +4.75V to +5.25V (VDDA/VDDB/VDDR) - compatible with standard 5V industrial and medical system rails. |
| Package | TQFP-48, 7mm × 7mm - surface-mountable with thermal resistance θJA = 56.5°C/W for conduction-cooled designs. |
| Operating Temp | –40°C to +85°C - qualified for use in portable ultrasound scanners and base-station wireless receivers. |
Pinout & Package
TQFP-48 package with exposed thermal pad; 0.5mm pitch; RoHS-compliant; moisture sensitivity level 3.
| 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 linearity. |
| LNPOUTPA / LNPOUTNA | Channel A LNP differential output | Drives VCA directly; capable of 2VPP differential swing into ≥135Ω load. |
| LNPGS1A–LNPGS3A | Channel A LNP gain strap inputs | Binary-coded pins selecting 5/17/22/25dB LNP gain; internal resistor ladder with ±0.5% matching. |
| MGS1–MGS3 | Maximum gain select (MSB–LSB) | Sets VCA+PGA peak gain to 24/27/30/33/36/39/42/45dB; shared across both channels. |
| VCACNTL | Analog gain control voltage input | 0.2V–3.0V linear-in-dB control; 10.9dB/V slope; 0.2µs settling for full 45dB step. |
| FBA / SWFBA | Channel A feedback outputs | FBA provides fixed feedback; SWFBA enables active termination switching via FBSWCNTL logic. |
| VCAOUTPA / VCAOUTNA | Channel A VCA differential output | Drives ADC directly; 2VPP output swing into 500Ω each side to ground; DC offset = 2.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Active termination support | Reduces noise figure up to 4.6dB vs passive shunt termination via programmable FB/SWFB interface. |
| Dual independent LNP gain control | Per-channel LNPGS1–3 strapping enables mismatched channel gains for beam steering calibration. |
| Low crosstalk architecture | 68dB isolation at 1MHz achieved via separate analog supplies, grounds, and internal reference domain. |
| Overload recovery circuitry | Clips symmetrically during overdrive and substitutes DC level to avoid slow recovery distortion in burst-mode signals. |
| Programmable group delay | ±2ns variation across 1–10MHz and full gain range - critical for phase-coherent multi-channel sampling. |
Applications
| Ultrasound Beamforming | Wireless IF Receiver |
|---|---|
Use Scenario: Multi-channel echo signal amplification in portable and cart-based ultrasound systems with dynamic range >120dB. IC Role / Device Role / Timing Role: Dual-channel LNP+VGA front-end per transducer element; provides time-gain compensation (TGC) and active cable termination. Use Value: 1.25nV/√Hz input noise and 68dB crosstalk enable high-resolution B-mode imaging with minimal speckle degradation. |
Use Scenario: Baseband/IF amplification in cellular infrastructure receivers (WCDMA, LTE) requiring high IP3 and low noise. IC Role / Device Role / Timing Role: Variable gain stage after mixer; interfaces to 14-bit ADC with 500Ω differential input impedance. Use Value: –71dBc third-harmonic distortion at 5MHz and 40MHz bandwidth support wide instantaneous signal bandwidths. |
| Automated Test Equipment | High-Speed Data Acquisition |
Use Scenario: Precision signal conditioning in modular PXI digitizers handling multi-MHz analog stimuli and responses. IC Role / Device Role / Timing Role: Programmable gain front-end before high-speed ADC; supports external signal injection via VCAINSEL. Use Value: 0.2µs VCA response time and ±1dB gain error enable rapid gain calibration sequences without settling delays. |
Use Scenario: Low-noise analog front-end in oscilloscope or spectrum analyzer digitizer modules. IC Role / Device Role / Timing Role: Differential signal chain component with 2VPP output swing and 500Ω load drive capability. Use Value: 2.5V DC output common-mode matches ADC reference; eliminates level-shifting circuitry and reduces BOM count. |
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 or active termination. | Requires external preamp for <2nV/√Hz noise; suited for RF gain control, not ultrasound TGC. | Select when ultra-wide bandwidth (>100MHz) is prioritized over channel integration and noise optimization. |
| VCA2615Y | Pin-compatible upgrade with improved 0.85nV/√Hz LNP noise, 50MHz VCA bandwidth, and enhanced IMD performance. | Direct drop-in replacement for new designs targeting higher dynamic range in next-gen ultrasound systems. | Choose for new designs where lower noise and wider bandwidth justify minor cost increase and updated qualification. |
Compared with AD8367ARUZ, the VCA2612Y-1/2K integrates LNP+VCA+PGA in one TQFP-48 package with active termination-reducing board area and noise floor-but trades off RF bandwidth. Compared with VCA2615Y, it offers proven reliability and broader design documentation, though with slightly higher noise and narrower bandwidth.
Availability
VCA2612Y-1/2K is available at Aetrix Electronics and suitable for ultrasound systems, wireless infrastructure receivers, and automated test equipment requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for VCA2612Y-1/2K 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, embedded processing, and high-performance signal chain solutions.
The VCA2612Y-1/2K belongs to TI's precision analog front-end portfolio, designed specifically for medical ultrasound and communications receiver applications demanding ultra-low noise, high channel density, and programmable gain linearity.
FAQ
What is the minimum recommended source impedance for optimal noise performance of the VCA2612Y-1/2K?
The VCA2612Y-1/2K achieves its lowest noise figure (6.2dB) with a 75Ω source impedance and 22dB LNP gain. For 50Ω systems, input-referred noise rises to ~2.2nV/√Hz due to mismatch; active termination using external feedback resistors can restore sub-7dB noise figure. Always verify noise performance with actual source impedance and termination configuration in final layout.
Can the VCA2612Y-1/2K drive a 100Ω differential ADC input directly?
No - the VCA2612Y-1/2K is specified for 500Ω differential loads per side to ground. Driving 100Ω loads causes excessive current demand (exceeding ±40mA short-circuit rating), gain compression, and harmonic distortion degradation. Use a 1:2 broadband transformer or buffer amplifier (e.g., THS4561) between VCA2612Y-1/2K and low-impedance ADCs.
How does the MGS pin configuration affect the VCA2612Y-1/2K's gain accuracy and bandwidth?
MGS bits set the maximum gain of the PGA stage, which directly scales the VCA+PGA composite transfer function. Higher MGS settings (e.g., 111 → 45dB) reduce small-signal bandwidth slightly (e.g., 40MHz → 38MHz) and increase gain error tolerance (±1dB → ±1.3dB) due to increased internal node capacitance. Bandwidth remains within 5% across all MGS codes.
Is the VCA2612Y-1/2K suitable for single-ended signal paths?
Yes - the LNP accepts single-ended inputs (via LNPINP only, with LNPINN grounded), and the VCA outputs can be used single-ended (VCAOUTP only, with VCAOUTN AC-coupled to ground). However, differential operation improves CMRR (>50dB), reduces 2nd-harmonic distortion by >15dB, and doubles output swing - strongly recommended unless board space constraints prohibit it.
What is the purpose of the VCM pin (Pin 19) on the VCA2612Y-1/2K?
VCM (Pin 19) provides a stable 2.5V reference for biasing external coupling networks and ensuring correct common-mode level at the VCA inputs. When feeding external signals into VCAINP/VCAINN, the source must be referenced to VCM ±10mV. Bypassing VCM to ground with 0.01µF capacitor is mandatory to suppress noise coupling into the sensitive analog core.
VCA2612Y-1/2K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-TQFP
- Packaging:
- Bulk
- Product Status:
- Active
- 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-1/2K FAQ
1.How can I place an order for VCA2612Y-1/2K through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA2612Y-1/2K 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-1/2K reliable?
The price and inventory of VCA2612Y-1/2K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA2612Y-1/2K is usually 5 days.
3.What payment methods are accepted for VCA2612Y-1/2K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA2612Y-1/2K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA2612Y-1/2K?
VCA2612Y-1/2K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA2612Y-1/2K 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-1/2K?
For technical support, including VCA2612Y-1/2K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA2612Y-1/2K requirements.
6.How does Aetrix verify that VCA2612Y-1/2K is sourced from the original manufacturer or authorized distributors?
All VCA2612Y-1/2K 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-1/2K meets industry standards.
7.What is the process for return or replacement of VCA2612Y-1/2K?
All VCA2612Y-1/2K units undergo pre-shipment inspection (PSI). If there is an issue with VCA2612Y-1/2K, 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-1/2K part is unused and in its original packaging.
Return procedure for VCA2612Y-1/2K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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