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Texas Instruments VCA2613Y/2K
- Part No.:
- VCA2613Y/2K
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 48-TQFP
- Datasheet:
-
VCA2613Y/2K.pdf
- Description:
- IC VARIABLE GAIN 2 CIRC 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,071
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Product details
Overview
VCA2613Y/2K from Texas Instruments is a dual-channel, monolithic low-noise preamplifier plus variable-gain amplifier (VGA) IC designed for high-fidelity analog signal conditioning in RF and medical front-ends. It integrates a 5dB–25dB programmable LNP with active termination and a 24dB–45dB voltage-controlled VGA, delivering 1.0nV/√Hz input noise at 22dB LNP gain, 80MHz LNP bandwidth, and 40MHz VGA bandwidth - enabling high-SNR reception in ultrasound beamforming and wireless baseband chains.
For engineers reviewing the VCA2613Y/2K datasheet, VCA2613Y/2K pinout, VCA2613Y/2K application, or VCA2613Y/2K equivalent, key selection criteria include differential LNP/VGA I/O, MGS-selectable maximum gain (24–45dB), VCACNTL analog gain control (0.2–3.0V), active termination noise optimization, and TQFP-48 package compatibility with high-density mixed-signal PCB layouts.
Technical Context
The VCA2613Y/2K implements a three-stage signal path per channel: an actively terminated low-noise preamplifier (LNP), a voltage-controlled attenuator (VCA), and a programmable gain amplifier (PGA). The LNP uses shared-bias transistor architecture to achieve 1.0nV/√Hz noise while maintaining 600kΩ unterminated input impedance and switchable 75Ω/50Ω active termination via external feedback resistors.
Gain control is hierarchical: coarse maximum gain is set by 3-bit MGS inputs (pins 40–42), defining eight PGA gain options (24–45dB); fine analog adjustment is applied via VCACNTL (pin 43), yielding linear-in-dB gain slope of 10.9dB/V across 0.2–3.0V with 0.2µs response time for 45dB gain change. Crosstalk is minimized to –68dB at 1MHz via separate analog supplies (VDDA/VDDB), isolated reference (VDDR), and differential routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LNP Input Noise | 1.0nV/√Hz at 22dB gain - enables sub-6dB noise figure with 75Ω source impedance |
| VGA Input Noise | 3.3nV/√Hz differential - maintains SNR integrity when cascading after LNP |
| LNP Bandwidth | 80MHz at 22dB gain - supports wideband IF sampling up to 40MHz Nyquist zone |
| VGA Bandwidth | 40MHz - matches ADC input requirements for 12–14-bit converters at 80MSPS |
| Crosstalk | –68dB at 1MHz, max gain - ensures independent channel operation in dual-beam ultrasound |
| Gain Control Range | 24dB to 45dB total gain (LNP+VGA) - provides 21dB dynamic range adjustment per channel |
| Supply Voltage | +4.75V to +5.25V - compatible with standard 5V industrial and medical power rails |
Pinout & Package
TQFP-48 package with 0.5mm pitch, thermally enhanced exposed pad, and dual analog/digital supply separation for crosstalk suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA / VDDB | Channel A/B analog supply | Independent 5V rails minimize inter-channel coupling; each powers respective LNP/VGA blocks |
| LNPINPA / LNPINNA | Channel A LNP noninverting/inverting input | Differential input accepts single-ended or balanced signals; supports active termination via FB/SWF pins |
| LNPOUTPA / LNPOUTNA | Channel A LNP differential output | Drives VCA directly or external circuitry; 2.5V common-mode level matches VCA input requirement |
| VCAINPA / VCAINNA | Channel A VCA differential input | Selectable via VCAINSEL pin between LNP output or external source - enables bypass or hybrid signal paths |
| VCAOUTPA / VCAOUTNA | Channel A VCA differential output | Drives ADCs differentially; ±2VPP swing into ≥500Ω load ensures full-scale utilization of 12–14-bit converters |
| VCACNTL | Analog gain control voltage | 0.2–3.0V input sets VCA attenuation; 10.9dB/V slope enables precise dB-linear AGC implementation |
| MGS0–MGS2 | Maximum Gain Select bits | 3-bit logic selects PGA max gain: 24/27/30/33/36/39/42/45dB - defines upper bound of swept-gain curve |
| FBSWCNTL | Feedback switch control | HI enables parallel feedback resistor for dual-impedance active termination - optimizes noise vs. bandwidth trade-off |
Key Features
| Feature | Design Value |
|---|---|
| Active Termination Noise Reduction | Improves noise figure by up to 4.6dB vs. shunt termination by eliminating signal-current loss in termination resistor |
| Switchable Termination Value | Supports 50Ω or 75Ω cable-matched sources via external feedback resistor selection - critical for CATV and ultrasound transducer matching |
| Dual-Channel Independence | Separate VDDA/VDDB, GNDA/GNDB, and VDDR supplies reduce inter-channel crosstalk to –68dB at 1MHz |
| Overdrive Recovery Clamping | Internal symmetric clipping and DC substitution prevent distortion during ADC overrange - ensures clean recovery in pulsed ultrasound |
| Programmable LNP Gain Straps | Four fixed gains (5/17/22/25dB) via LNPGS1–3 pins; external resistors enable intermediate settings with ±0.5% internal ratio tracking |
Applications
| Ultrasound Beamforming | Wireless Baseband Receiver |
|---|---|
Use Scenario: Analog front-end for multi-channel phased-array ultrasound transducers acquiring echo signals at 2–15MHz. IC Role / Device Role / Timing Role: Dual-channel LNP amplifies weak echo returns with <1.0nV/√Hz noise; VGA dynamically adjusts gain per channel to compensate for depth-dependent attenuation. Use Value: Enables >120dB dynamic range per channel and sub-6dB noise figure - essential for detecting low-amplitude deep-tissue echoes. |
Use Scenario: IF/RF signal conditioning in cellular base station receivers handling WCDMA/LTE signals with 20MHz bandwidth. IC Role / Device Role / Timing Role: LNP provides low-noise amplification of downconverted signals; VGA implements fast AGC synchronized to frame timing. Use Value: 40MHz VGA bandwidth and 0.2µs gain step response support real-time AGC in burst-mode TD-LTE systems. |
| High-Resolution Test Equipment | Medical Imaging Signal Chain |
Use Scenario: Input stage of 14-bit, 100MSPS digitizers used in automated test equipment for RF component characterization. IC Role / Device Role / Timing Role: Differential LNP/VGA pair conditions signals before ADC sampling; active termination matches 50Ω lab equipment interfaces. Use Value: 80MHz LNP bandwidth and –71dBc third-harmonic distortion preserve spectral purity for ENOB >11.5 bits. |
Use Scenario: Signal conditioning in portable MRI gradient coil monitoring or EEG/ECG front-ends requiring ultra-low-noise amplification. IC Role / Device Role / Timing Role: LNP operates at 5dB gain for high-input-impedance biopotential sensing; VGA adds programmable gain for varying electrode contact quality. Use Value: 600kΩ unterminated LNP input impedance minimizes loading on high-Z biological sources; 1.0nV/√Hz noise ensures µV-level signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise variable-gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VCA2612Y/2K | Higher input noise (1.25nV/√Hz vs. 1.0nV/√Hz); identical pinout, MGS/VCACNTL interface, and TQFP-48 package | Suitable where 0.25nV/√Hz noise difference is acceptable - e.g., less demanding ultrasound or general-purpose instrumentation | Select VCA2612Y/2K only if cost sensitivity outweighs 0.5dB noise-figure penalty in critical SNR-limited designs. |
| LMH6514MMX/NOPB | Single-channel VGA with 2.1nV/√Hz noise, 800MHz bandwidth, and digital SPI gain control - no integrated LNP or active termination | Better suited for wideband RF gain control above 100MHz; lacks LNP's cable-termination capability and dual-channel integration | Choose LMH6514MMX/NOPB when system requires >100MHz bandwidth or digital gain programming, not dual-channel low-noise analog front-end integration. |
Compared with VCA2613Y/2K, VCA2612Y/2K trades 0.25nV/√Hz higher noise for legacy compatibility, while LMH6514MMX/NOPB sacrifices integrated LNP and active termination for wider bandwidth and digital control - making VCA2613Y/2K uniquely optimal for dual-channel, noise-critical, cable-terminated applications like ultrasound and precision test gear.
Availability
VCA2613Y/2K is available at Aetrix Electronics and suitable for ultrasound beamforming, wireless baseband receivers, and high-resolution test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for medical and industrial OEM programs.
Supply support for VCA2613Y/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 for medical, industrial, and communications markets.
The VCA2613Y/2K belongs to TI's high-speed, low-noise amplifier product line, engineered specifically for analog front-ends in ultrasound imaging, wireless infrastructure, and precision instrumentation where noise figure, gain accuracy, and channel isolation are design-critical.
FAQ
What is the minimum recommended supply voltage for reliable operation of the VCA2613Y/2K?
The VCA2613Y/2K is specified for operation from +4.75V to +5.25V on all analog supplies (VDDA, VDDB, VDDR). Operating below +4.75V risks gain compression, increased distortion, and failure to meet the 1.0nV/√Hz input noise specification. For stable performance in medical or industrial environments, maintain VDDA/VDDB within this range using low-noise LDO regulation. The VCA2613Y/2K datasheet confirms that power dissipation remains within 410–495mW across this voltage window.
How does active termination improve noise performance in the VCA2613Y/2K compared to passive shunt termination?
Active termination in the VCA2613Y/2K replaces a passive shunt resistor with a controlled feedback loop, eliminating the 3dB theoretical SNR degradation inherent in passive termination. By avoiding signal-current loss in a physical resistor, the VCA2613Y/2K achieves up to 4.6dB noise-figure improvement - verified in TI's SBOS179C datasheet Figures 6 and 7. This is critical for ultrasound transducer interfaces where source impedances are 50–75Ω and noise floor directly limits image depth resolution.
Can the VCA2613Y/2K drive a 12-bit, 80MSPS ADC directly without external buffering?
Yes - the VCA2613Y/2K differential outputs deliver ±2VPP into ≥500Ω loads with <–71dBc third-harmonic distortion at 5MHz, meeting typical 12-bit ADC full-scale and linearity requirements. Its 40MHz VGA bandwidth supports Nyquist zones up to 20MHz, and the 2.5V common-mode output aligns with most ADC differential inputs. The VCA2613Y/2K output impedance is 1Ω at 5MHz, ensuring minimal mismatch loss when interfaced via 100Ω differential PCB traces to the ADC.
What is the purpose of the FBSWCNTL pin on the VCA2613Y/2K, and how should it be used?
The FBSWCNTL pin (pin 45) controls an internal switch that adds a parallel resistor to the LNP feedback network, enabling two distinct active-termination impedances per channel. When HIGH, it reduces effective feedback resistance to optimize noise figure for lower-source-impedance transducers (e.g., 50Ω); when LOW, it reverts to standard termination for higher-impedance sources (e.g., 75Ω). This allows dynamic adaptation to varying probe or antenna characteristics without changing external components - a feature confirmed in the VCA2613Y/2K functional description and pin table.
Does the VCA2613Y/2K support single-ended input and output configurations?
The VCA2613Y/2K is optimized for differential operation but supports single-ended use with performance trade-offs. The LNP accepts single-ended inputs at LNPINPA or LNPINNA (with other input grounded), and the VGA output can be used single-ended by terminating one side (e.g., VCAOUTNA to ground), though this incurs 6dB signal loss and reduced CMRR. TI's SBOS179C datasheet explicitly states "output from the VCA is single-ended unless otherwise noted", confirming single-ended mode is supported - but differential operation is required to achieve the published 1.0nV/√Hz noise and –68dB crosstalk specs.
VCA2613Y/2K 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)
VCA2613Y/2K FAQ
1.How can I place an order for VCA2613Y/2K through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA2613Y/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 VCA2613Y/2K reliable?
The price and inventory of VCA2613Y/2K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA2613Y/2K is usually 5 days.
3.What payment methods are accepted for VCA2613Y/2K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA2613Y/2K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA2613Y/2K?
VCA2613Y/2K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA2613Y/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 VCA2613Y/2K?
For technical support, including VCA2613Y/2K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA2613Y/2K requirements.
6.How does Aetrix verify that VCA2613Y/2K is sourced from the original manufacturer or authorized distributors?
All VCA2613Y/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 VCA2613Y/2K meets industry standards.
7.What is the process for return or replacement of VCA2613Y/2K?
All VCA2613Y/2K units undergo pre-shipment inspection (PSI). If there is an issue with VCA2613Y/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 VCA2613Y/2K part is unused and in its original packaging.
Return procedure for VCA2613Y/2K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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