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Texas Instruments VCA2613Y/250
- Part No.:
- VCA2613Y/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 48-TQFP
- Datasheet:
-
VCA2613Y/250.pdf
- Description:
- IC VARIABLE GAIN 2 CIRC 48TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:443
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Product details
Overview
VCA2613Y/250 from Texas Instruments is a dual-channel, monolithic low-noise preamplifier (LNP) plus variable-gain amplifier (VGA) in TQFP-48 packaging. It delivers 1.0nV/√Hz input noise at 22dB LNP gain, 80MHz LNP bandwidth, 40MHz VGA bandwidth, and differential I/O for ultrasound front-ends requiring high SNR and dynamic range.
For engineers reviewing the VCA2613Y/250 datasheet, VCA2613Y/250 pinout, VCA2613Y/250 application, or VCA2613Y/250 equivalent, key selection criteria include active termination noise optimization, programmable maximum gain select (MGS), analog voltage-controlled attenuation (0.2–3.0V), dual-channel crosstalk ≤–68dB, and support for external signal routing to the VGA stage.
Technical Context
The VCA2613Y/250 integrates three functional blocks per channel: an active-termination-capable LNP with four pin-strappable gains (5/17/22/25dB), a voltage-controlled attenuator (VCA) with 24–45dB composite gain, and a post-amplifier (PGA) sharing MGS control bits. Its dual-channel architecture uses separate analog supplies (VDDA/VDDB), reference supply (VDDR), and ground planes (GNDA/GNDB/GNDR) to suppress interchannel crosstalk.
Gain programming combines digital MGS bits (pins 40–42) setting peak attenuation and analog VCACNTL (pin 43) enabling dB-linear sweep across 0–45dB total gain. The LNP employs patented shared-bias current topology to minimize power (495mW max) while maintaining 1.0nV/√Hz noise at 22dB gain and 6.2dB noise figure at RS = 75Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Noise Density | 1.0nV/√Hz at 22dB LNP gain - enables detection of weak signals in medical ultrasound transducer arrays |
| LNP Bandwidth | 80MHz at 22dB gain - supports wideband RF/IF signal conditioning up to 40MHz Nyquist for ADCs |
| VGA Bandwidth | 40MHz - ensures flat group delay (±2ns) across full gain range for time-critical imaging applications |
| Crosstalk | –68dB at max gain, 1MHz - isolates dual-channel receive paths in phased-array ultrasound systems |
| Gain Control Range | 0–45dB via 0.2–3.0V VCACNTL - provides 10.9dB/V slope for precise AGC loop implementation |
| Power Supply | +4.75V to +5.25V - compatible with standard 5V industrial and medical power rails |
| Package | TQFP-48 - surface-mount footprint with thermal pad for 495mW dissipation in compact PCB layouts |
Pinout & Package
TQFP-48 package with exposed thermal pad; 7mm × 7mm body, 0.5mm pitch, JEDEC MO-220 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDA / VDDB | Channel A/B Analog Supply | Independent 5V rails isolate supply noise between channels; decoupling required at each pin |
| LNPINPA / LNPINNA | Channel A LNP Noninverting/Inverting Input | Differential inputs support active termination via external feedback resistor (FBA/FBB pins) |
| LNPOUTPA / LNPOUTNA | Channel A LNP Positive/Negative Output | Buffered differential outputs drive VCA directly or external circuitry; 2.5V common-mode level |
| VCACNTL | VCA Control Voltage Input | Analog 0.2–3.0V input sets attenuation slope (10.9dB/V); 1MΩ input resistance minimizes loading |
| MGS0–MGS2 | Maximum Gain Select Bits | 3-bit logic interface selects peak VGA gain (24–45dB in 3dB steps); shared across both channels |
| VCAOUTPA / VCAOUTNA | Channel A VCA Positive/Negative Output | Differential outputs drive 500Ω loads; ±40mA short-circuit capability protects against overdrive |
Key Features
| Feature | Design Value |
|---|---|
| Active Termination Noise Reduction | Improves noise figure by up to 4.6dB vs. shunt termination by eliminating resistive signal loss |
| Switchable Termination Value | FBSWCNTL pin toggles parallel feedback path to optimize input impedance for varying source impedances |
| Programmable LNP Gain | Four fixed gains (5/17/22/25dB) via LNPGS1–LNPGS3 strapping; external resistors enable intermediate settings |
| Dual-Channel Crosstalk Suppression | –68dB isolation achieved via separate power/ground domains and internal reference regulation (VDDR/GNDR) |
| Overdrive Recovery Clamping | Internal comparators limit output symmetrically during PGA overload, preventing distortion recovery artifacts |
Applications
| Ultrasound Beamforming | Wireless IF Receiver |
|---|---|
Use Scenario: 128-channel phased-array ultrasound front-end digitizing echo signals from piezoelectric transducers. IC Role / Device Role / Timing Role: Dual-channel LNP+VGA performs low-noise amplification and programmable gain control before ADC sampling. Use Value: 1.0nV/√Hz input noise and 80MHz bandwidth preserve weak echo fidelity; active termination reduces system noise figure by 4.6dB. | Use Scenario: Multi-standard wireless base station receiver downconverting LTE/WiMAX signals to baseband. IC Role / Device Role / Timing Role: Dual-channel VGA conditions IF signals prior to quadrature demodulation and ADC conversion. Use Value: 40MHz bandwidth and –68dB crosstalk maintain channel orthogonality; MGS+VCACNTL enables fast AGC response in fading environments. |
| High-Speed Test Equipment | Medical Imaging Signal Chain |
Use Scenario: Automated test equipment capturing transient waveforms from high-frequency sensors or communication ICs. IC Role / Device Role / Timing Role: Dual-channel signal conditioner providing adjustable gain and low-noise amplification before digitization. Use Value: 24–45dB VGA range and 300V/µs slew rate support wide dynamic range capture without clipping; differential I/O rejects common-mode noise. | Use Scenario: Portable MRI or CT detector module amplifying low-level analog sensor outputs. IC Role / Device Role / Timing Role: Dual-channel analog front-end delivering stable gain, low distortion, and clean overdrive recovery. Use Value: –45dBc third-harmonic distortion and 2VPP output swing ensure accurate signal representation; thermal pad enables reliable operation at 495mW. |
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/250 | Higher input noise (1.25nV/√Hz vs. 1.0nV/√Hz); identical pinout and MGS/VCACNTL interface | Less suitable for ultra-low-noise ultrasound front-ends where every 0.25nV impacts detectable depth | Select VCA2612Y/250 only if legacy design compatibility outweighs 0.25nV/√Hz noise penalty |
| THS7530IRHBT | Single-channel, 3.3nV/√Hz noise, 180MHz bandwidth; no active termination or MGS control | Better for wideband video or high-speed data acquisition where channel count > noise priority | Choose THS7530IRHBT when single-channel operation and higher bandwidth supersede dual-channel noise optimization |
Compared with VCA2612Y/250, the VCA2613Y/250 delivers superior noise performance critical for deep-tissue ultrasound; versus THS7530IRHBT, it trades bandwidth for integrated dual-channel AGC functionality and active termination-making it optimal for medical imaging signal chains requiring matched channel behavior and minimal noise figure.
Availability
VCA2613Y/250 is available at Aetrix Electronics and suitable for ultrasound beamforming, wireless IF receivers, and high-speed test equipment requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for VCA2613Y/250 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and medical markets.
The VCA2613Y/250 belongs to TI's high-performance analog front-end product line, engineered specifically for noise-critical medical imaging and communications receivers demanding integrated preamp/VGA functionality with active termination.
FAQ
What is the minimum recommended external feedback resistor value for active termination on VCA2613Y/250?
The minimum recommended external feedback resistor (RF) for active termination on VCA2613Y/250 is 500Ω. This value ensures stable operation while achieving optimal noise figure improvement-particularly at 75Ω source impedances-without exceeding the LNP's output drive capability. Lower values risk instability due to excessive loop gain; higher values degrade noise performance. Always verify stability with compensation capacitors on COMP1A/COMP2A pins per Figure 10 in the SBOS179C datasheet.
Can VCA2613Y/250 operate with a single 3.3V supply instead of the specified 5V?
No, VCA2613Y/250 cannot operate reliably on a 3.3V supply. Its absolute maximum ratings specify +6V upper limit but require +4.75V to +5.25V for full specification compliance-including 1.0nV/√Hz noise, 45dB gain, and 40MHz bandwidth. At 3.3V, the LNP and VGA stages fail to bias correctly, resulting in degraded noise figure (>2.5nV/√Hz), reduced gain accuracy (±5dB error), and bandwidth collapse below 10MHz. Always use a regulated 5V rail for VCA2613Y/250.
How does the FBSWCNTL pin affect VCA2613Y/250 performance in active termination mode?
The FBSWCNTL pin on VCA2613Y/250 enables dynamic switching between two feedback resistor values by activating an internal ~1Ω ON-resistance switch between SWFBA/SWFBB and FBA/FBB. When FBSWCNTL = HIGH, the effective feedback resistance decreases, lowering input impedance to match lower-source-impedance transducers (e.g., 50Ω coaxial cables). This maintains optimal noise figure across varying probe configurations without hardware changes-critical for field-upgradable ultrasound systems using VCA2613Y/250.
What is the purpose of the VCM pin (pin 19) on VCA2613Y/250, and how should it be used?
The VCM pin (pin 19) on VCA2613Y/250 provides a stable 2.5V common-mode reference for AC-coupled external signal sources feeding the VCA inputs. It must be bypassed with a 0.01µF capacitor to GNDR to suppress noise. When connecting external op amps or filters to VCAINPA/VCAINNA, their output common-mode level must match VCM within ±10mV-otherwise, the VCA's input stage saturates. Direct coupling from the internal LNP outputs avoids this requirement since they inherently settle at 2.5V, simplifying designs using VCA2613Y/250's integrated signal chain.
Does VCA2613Y/250 support DC-coupled operation for the LNP input stage?
No, VCA2613Y/250 does not support true DC-coupled operation at the LNP input. Its LNP features a 44µs high-pass time constant (3.6kHz corner frequency) due to internal AC coupling between gain stages. Attempting DC input causes severe baseline shift and saturation. For sub-10kHz applications, external DC-blocking capacitors (e.g., 100nF) must be placed before LNPINPA/LNPINNA, and the VCM pin (pin 19) must establish the correct 2.5V bias point. The VCA2613Y/250 is optimized for AC-coupled RF/IF signal chains-not precision DC instrumentation.
VCA2613Y/250 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/250 FAQ
1.How can I place an order for VCA2613Y/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA2613Y/250 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/250 reliable?
The price and inventory of VCA2613Y/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA2613Y/250 is usually 5 days.
3.What payment methods are accepted for VCA2613Y/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA2613Y/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA2613Y/250?
VCA2613Y/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA2613Y/250 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/250?
For technical support, including VCA2613Y/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA2613Y/250 requirements.
6.How does Aetrix verify that VCA2613Y/250 is sourced from the original manufacturer or authorized distributors?
All VCA2613Y/250 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/250 meets industry standards.
7.What is the process for return or replacement of VCA2613Y/250?
All VCA2613Y/250 units undergo pre-shipment inspection (PSI). If there is an issue with VCA2613Y/250, 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/250 part is unused and in its original packaging.
Return procedure for VCA2613Y/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VCA2613Y/250 Tags
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