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Texas Instruments VCA8613YT
- Part No.:
- VCA8613YT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 64-TQFP
- Datasheet:
-
VCA8613YT.pdf
- Description:
- IC VARIABLE GAIN 8 CIRC 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,487
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Product details
Overview
VCA8613YT from Texas Instruments is an 8-channel variable gain amplifier (VGA) with integrated low-noise preamplifier (LNA), voltage-controlled attenuator (VCA), programmable gain amplifier (PGA), and 2-pole low-pass filter - designed specifically for portable ultrasound beamforming. It delivers 1.2nV/√Hz input noise at 5MHz, 75mW/channel power at 3V, and 14MHz filter bandwidth, enabling high-fidelity analog signal conditioning in medical ultrasound receivers.
For engineers reviewing the VCA8613YT datasheet, VCA8613YT pinout, VCA8613YT application, or VCA8613YT equivalent, this page provides verified functional architecture, channel-specific gain control behavior, CW Doppler processor interface details, differential output drive capability, and TQFP-64 package layout guidance essential for ultrasound front-end design.
Technical Context
The VCA8613YT implements a cascaded analog signal path per channel: single-ended LNA (24.5dB fixed gain, 70MHz bandwidth) → programmable cross-point switch → VCA (0–40dB attenuation, dB-linear vs. VCNTRL) → PGA (21dB or 26dB selectable gain) → integrated 2-pole Butterworth low-pass filter (11–14MHz cutoff). All eight channels share a serial SPI interface (DIN/CLK/CS/DOUT) for register configuration including ATN[1:0], PG[1:0], and mode selection (TGC/CW).
Its CW Doppler processor integrates eight V/I converters (10.35–12.65mA/V transconductance), an 8×10 cross-point matrix, and ten CW output pins (CW0–CW9) supporting coherent summing of channel currents. The device operates across –40°C to +85°C with AVDD/DVDD = 2.85–3.15V and features readable control registers, integrated clamp diodes, and differential PGA outputs compatible with TI's ADS5121/ADS5122 ADCs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Channels | 8 independent analog signal paths with shared serial control interface |
| Input Noise Density | 1.2nV/√Hz at 5MHz (TGC mode), enabling high-SNR ultrasound echo detection |
| Power per Channel | 75mW at 3V supply, supporting battery-powered portable imaging systems |
| Filter Bandwidth | 14MHz (–3dB, PG=00), directly interfaces with 20MSPS+ differential ADCs without external filtering |
| VCA Attenuation Range | 0–40dB in four max-attenuation steps (29/33/36.5/40dB), continuously adjustable via 0–2.0V VCNTRL input |
| PGA Gain Options | 21dB or 26dB (digitally selected), providing scalable dynamic range for varying tissue depths |
| Crosstalk | 49dB (min), ensuring channel isolation critical for beam steering accuracy |
Pinout & Package
TQFP-64 package (10mm × 10mm, 0.5mm pitch), thermally enhanced with exposed thermal pad (PAG designation); requires proper analog/digital ground partitioning and decoupling per TI SBOS200F layout guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1–IN8 | Single-ended LNA inputs | Accept ultrasound transducer signals; internally biased to 2.4V common-mode with 4.5kΩ resistor and clamp diodes |
| OUT1–OUT8 (+/–) | Differential PGA outputs | Drive ADC inputs directly; 2VPP swing, 10Ω output impedance, 1V common-mode voltage |
| VCNTRL | VCA control voltage input | 0–2.0V analog input sets attenuation level; >1MΩ input resistance enables multi-device sharing |
| DIN/CLK/CS/DOUT | SPI serial interface | 5-byte command protocol for configuring ATN, PG, mode, and cross-point routing |
| CW0–CW9 | CW Doppler current outputs | Each sinks 2–2.5mA; require 3–3.3V compliance voltage for passive delay-line summing |
| VLNA/VFIL/VCM/VREF/VREFB | Internal reference outputs | Require external 0.1µF + 2.2µF bypass capacitors; VLNA = 2.4V, VCM = 1.0V, VFIL ≈ 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CW Doppler Processor | 8×10 cross-point matrix with V/I converters enables flexible Doppler channel summation without external components |
| Read-Back Control Registers | Serial interface supports read operations to verify ATN, PG, and mode settings-critical for safety-critical medical systems |
| Programmable Filter Cutoff | PGA gain selection changes filter bandwidth (11–14MHz), allowing optimization for near-field vs. far-field imaging resolution |
| Low-Power TGC Architecture | 75mW/channel at 3V with 1.2nV/√Hz noise achieves optimal SNR/power trade-off for handheld scanners |
| Input Clamp Diodes | Integrated back-to-back diodes protect LNA from transducer ring-down overvoltage, reducing need for external protection |
Applications
| Ultrasound Beamforming | Portable Doppler Imaging |
|---|---|
Use Scenario: Real-time B-mode image acquisition in handheld ultrasound devices using phased-array transducers. IC Role / Device Role / Timing Role: Primary analog front-end VGA performing time-gain compensation (TGC) across all 8 receive channels before digitization. Use Value: 1.2nV/√Hz input noise and 75mW/channel power enable high-resolution imaging with extended battery life. | Use Scenario: Continuous-wave Doppler blood flow velocity measurement in point-of-care cardiac monitors. IC Role / Device Role / Timing Role: CW processor generating summed Doppler signals from selected transducer elements via 8×10 matrix. Use Value: Integrated V/I converters and CW outputs eliminate discrete op-amps and summing resistors, reducing board area by >30%. |
| Medical A-Mode Scanning | Industrial NDT Receivers |
Use Scenario: High-precision depth profiling in ophthalmic or dermatological ultrasound systems. IC Role / Device Role / Timing Role: Precision gain-controlled amplification of short-duration echo bursts with minimal group delay variation (±3ns). Use Value: 24.5dB LNA gain + 21/26dB PGA gain provides >45dB total programmable dynamic range for weak echo detection. | Use Scenario: Ultrasonic thickness gauging and flaw detection in metal/ceramic inspection equipment. IC Role / Device Role / Timing Role: Low-noise, wide-bandwidth signal conditioning for pulsed-echo NDT waveforms up to 10MHz. Use Value: 70MHz LNA bandwidth and 14MHz filter support high-frequency transducers while suppressing out-of-band noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VCA8617YT | 16-channel version with identical architecture, same pinout but larger TQFP-100 package | Supports higher-element transducer arrays; requires PCB redesign due to different footprint and power delivery | Select when scaling from 8- to 16-channel beamforming without changing analog signal chain topology |
| LMH6514MA | Single-channel VGA with 2.1GHz bandwidth, no integrated LNA/filter/CW processor | Lacks ultrasound-specific features (clamping diodes, CW matrix, TGC timing); requires external components for full front-end | Choose for non-medical RF/IF gain control where ultra-wide bandwidth outweighs integration benefits |
Compared with VCA8613YT, the VCA8617YT scales channel count while preserving gain control linearity and noise performance, whereas the LMH6514MA trades integration for bandwidth-making VCA8613YT uniquely optimized for portable ultrasound TGC and CW processing within a single TQFP-64 IC.
Availability
VCA8613YT is available at Aetrix Electronics and suitable for portable ultrasound systems, medical Doppler monitors, and industrial NDT equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing for Class II medical device manufacturing.
Supply support for VCA8613YT 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 company specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and signal chain solutions.
The VCA8613YT belongs to TI's ultrasound analog front-end (AFE) product line, engineered specifically for low-power, high-SNR beamforming in portable and point-of-care medical imaging systems.
FAQ
What is the maximum input voltage the VCA8613YT LNA can handle linearly?
The VCA8613YT LNA maintains linear operation up to 110mVPP input at 5MHz. Exceeding this causes distortion; the integrated clamp diodes protect against larger transducer ring-down pulses. For optimal SNR, keep input signals within this range during TGC mode operation. The VCA8613YT datasheet specifies this limit under "Maximum Input Voltage" in the Electrical Characteristics table.
How does the VCA8613YT support both TGC and CW Doppler modes?
The VCA8613YT uses a dedicated mode bit (bit 5 in Byte 1) to select between TGC mode (CW powered down) and Doppler mode (TGC powered down). In TGC mode, all 8 channels process echo amplitude; in CW mode, the V/I converters and 8×10 matrix route LNA outputs to CW0–CW9 for coherent summing. This dual-mode capability is intrinsic to the VCA8613YT architecture.
What external components are required for stable VCA8613YT operation?
The VCA8613YT requires external bypass capacitors on VLNA, VFIL, VCM, VREF, and VREFB pins (0.1µF ceramic + 2.2µF tantalum each), 1nF AC-coupling caps on IN1–IN8, and 3–3.3V compliance voltage on CW0–CW9. No external filter components are needed-the 2-pole low-pass filter is fully integrated. These requirements are validated in the VCA8613YT application schematic (Figure 8, SBOS200F).
Can multiple VCA8613YT devices share a single VCNTRL control voltage?
Yes-the VCA8613YT VCNTRL input has >1MΩ impedance, allowing one analog control voltage to set gain simultaneously across multiple VCA8613YT ICs. This simplifies system-level TGC ramp generation in multi-board ultrasound systems. The VCA8613YT datasheet confirms this in the "Gain Slope" and "Input Resistance" specifications under Electrical Characteristics.
What is the purpose of the readable control registers in the VCA8613YT?
The VCA8613YT supports read-back of its internal control registers via the SPI interface, enabling firmware to verify ATN, PG, mode, and cross-point settings after write commands. This capability is essential for diagnostic logging and fault recovery in FDA-regulated medical devices. The VCA8613YT's read functionality is implemented per the "READ TIMING" section of SBOS200F.
VCA8613YT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 8
- Output Type:
- Differential
- Slew Rate:
- 300V/µs
- Gain Bandwidth Product:
- 70 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 nA
- Voltage - Input Offset:
- -
- Current - Supply:
- -
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.85 V
- Voltage - Supply Span (Max):
- 3.15 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (10x10)
VCA8613YT FAQ
1.How can I place an order for VCA8613YT through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA8613YT 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 VCA8613YT reliable?
The price and inventory of VCA8613YT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA8613YT is usually 5 days.
3.What payment methods are accepted for VCA8613YT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA8613YT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA8613YT?
VCA8613YT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA8613YT 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 VCA8613YT?
For technical support, including VCA8613YT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA8613YT requirements.
6.How does Aetrix verify that VCA8613YT is sourced from the original manufacturer or authorized distributors?
All VCA8613YT 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 VCA8613YT meets industry standards.
7.What is the process for return or replacement of VCA8613YT?
All VCA8613YT units undergo pre-shipment inspection (PSI). If there is an issue with VCA8613YT, 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 VCA8613YT part is unused and in its original packaging.
Return procedure for VCA8613YT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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