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Texas Instruments VCA2615RGZT
- Part No.:
- VCA2615RGZT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
VCA2615RGZT.pdf
- Description:
- IC VARIABLE GAIN 2 CIRC 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:277
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Product details
Overview
VCA2615RGZT from Texas Instruments is a dual-channel, low-noise variable-gain amplifier integrating a programmable Low-Noise Preamplifier (LNP) and a linear-in-dB Variable-Gain Amplifier (VGA), operating on a single +5V supply with 42MHz bandwidth, 0.7nV/√Hz input-referred noise, and 52dB gain control range. It serves as the front-end signal conditioning stage in ultrasound beamforming chains, enabling high-fidelity echo reception before ADC digitization.
For engineers reviewing the VCA2615RGZT datasheet, VCA2615RGZT pinout, VCA2615RGZT application, or VCA2615RGZT equivalent, this page delivers verified electrical specifications, channel-matched gain accuracy (±0.33dB), active termination configuration, differential CW processing capability, and real-world overload recovery (25ns) - all critical for medical imaging system design and analog front-end validation.
Technical Context
The VCA2615RGZT implements a two-stage architecture: a digitally programmable LNP with four selectable gains (3/12/18/22dB) and four feedback resistor options (130Ω to 1500Ω) enables precise source impedance matching and optimized SNR; its buffered differential outputs feed either external CW processors or the integrated VGA. The VGA features linear-in-dB gain control (22dB/V) over 0.2–2.5V, switchable 0/+6dB post-gain modes, and adjustable output clipping via VCLMP (0.25–2.6V).
Both channels share a common VCNTL input and support independent power-down (PDL/PDV), delivering 154mW/channel typical dissipation. Channel-to-channel delay matching is ±1ns, crosstalk is −70dBc at 5MHz, and harmonic distortion remains ≤−55dBc across the full gain and frequency range - essential for coherent multi-channel beam synthesis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Noise | 0.7nV/√Hz - enables detection of weak ultrasound echoes without degrading system SNR. |
| Gain Control Range | 52dB - supports wide dynamic range compression required for near/far-field echo compensation. |
| Bandwidth | 42MHz - accommodates fundamental and harmonic imaging up to 15MHz transducer frequencies. |
| Harmonic Distortion | −55dB - ensures minimal spectral contamination during high-amplitude signal processing. |
| Supply Voltage | +5V single supply - simplifies power architecture and eliminates negative rail requirements. |
| Power Dissipation | 154mW/channel - allows dense channel count integration in portable and cart-based systems. |
| Overload Recovery | 25ns - maintains image fidelity during transient acoustic interference or probe coupling events. |
Pinout & Package
Package: QFN-48 (7×7mm), thermally enhanced with exposed pad tied to ground. Pin count: 48 terminals, including dual-channel analog I/O, digital control lines, and dedicated supply/ground per functional block.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCAIN+A / VCAIN−A VCAIN+B / VCAIN−B |
Differential VGA inputs | Accept externally selected signals (via VCAINSEL) for direct VGA processing, bypassing LNP. |
| LNPOUT+A / LNPOUT−A LNPOUT+B / LNPOUT−B |
Differential LNP outputs | Buffered outputs for off-chip CW processing or internal routing to VGA multiplexer. |
| G1, G2 | LNP gain select bits | Two-bit code sets LNP gain to 3dB (00), 12dB (01), 18dB (10), or 22dB (11). |
| FB1–FB4 | Active termination control | Four-bit selection of internal feedback resistors (130Ω–1500Ω) for optimal source matching. |
| VCNTL | VGA gain control voltage | Analog input (0.2–2.5V) setting VGA gain with 22dB/V linearity and 52dB total range. |
| VCLMP | Output clipping threshold | Analog voltage (0.25–2.6V) defining differential output swing limit to prevent ADC saturation. |
| H/L | VGA post-gain mode | Logic input selecting 0dB (low) or +6dB (high) final gain stage for ADC interface optimization. |
| PDL / PDV | Power-down controls | Independent shutdown of LNP (PDL) or VGA (PDV) blocks to reduce idle power consumption. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable LNP input impedance | 130Ω to 1500Ω via FB1–FB4 - enables active termination matching to diverse transducer impedances without external components. |
| Linear-in-dB VGA control | 22dB/V slope with ±0.9dB gain error - provides predictable, monotonic gain adjustment for time-gain compensation (TGC) algorithms. |
| Dual-channel gain matching | ±0.33dB channel-to-channel error - ensures coherent beamforming and uniform sensitivity across receive paths. |
| Adjustable output clipping | VCLMP pin accepts 0.25–2.6V to set differential output limit - prevents ADC overload while preserving dynamic range. |
| Low-noise differential CW outputs | Buffered LNPOUT± with 3.3VPP swing and 1.85V common-mode - directly interfaces with quadrature demodulators or envelope detectors. |
| Thermal stability | Gain error drift <±2.0dB from −40°C to +85°C - maintains calibration integrity in clinical environments. |
Applications
| Ultrasound Beamforming | Portable Diagnostic Imaging |
|---|---|
|
Use Scenario: Multi-channel analog front-end in phased-array ultrasound systems acquiring RF echo data from 128+ transducer elements. IC Role / Device Role / Timing Role: Dual-channel LNP+VGA performs time-gain compensation (TGC), dynamic range compression, and ADC interface conditioning for each receive path. Use Value: 0.7nV/√Hz noise floor and 52dB gain range enable detection of deep-tissue echoes while suppressing near-field clutter. |
Use Scenario: Compact, battery-powered handheld ultrasound devices requiring low power and high integration density. IC Role / Device Role / Timing Role: Front-end amplifier providing programmable gain, active termination, and differential CW outputs within tight thermal and space constraints. Use Value: 154mW/channel dissipation and QFN-48 package allow 32-channel integration on small PCBs without forced cooling. |
| High-Resolution Medical Imaging | Industrial NDT Systems |
|
Use Scenario: High-end cart-based ultrasound systems supporting harmonic imaging and elastography with 10-bit/12-bit ADCs. IC Role / Device Role / Timing Role: Signal conditioner optimizing SNR and linearity for both fundamental (3–5MHz) and second-harmonic (6–10MHz) modes. Use Value: −55dB harmonic distortion and 42MHz bandwidth preserve spectral fidelity required for tissue characterization. |
Use Scenario: Non-destructive testing equipment inspecting welds, castings, or composites using pulsed-echo ultrasonic methods. IC Role / Device Role / Timing Role: Receive-path amplifier handling high-amplitude return signals from metallic structures with fast overload recovery. Use Value: 25ns overload recovery and adjustable VCLMP clipping prevent dead-time loss during inspection of thick materials. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable-gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VCA2615PFBT | TQFP-48 package (vs. QFN-48); higher θJA (58°C/W vs. 29.1°C/W); identical electrical specs. | Better manufacturability for through-hole or mixed-technology boards; lower thermal performance limits channel density. | Select when board assembly process favors TQFP or thermal derating is acceptable for lower channel counts. |
| VCA2616RGZT | Uses attenuator+fixed-gain architecture (vs. true VGA); higher input noise (1.1nV/√Hz); same pinout and control interface. | Higher system noise at low gains; suitable where cost or legacy design compatibility outweighs noise performance. | Choose only if existing VCA2616 layout reuse is mandatory; avoid for new high-SNR designs. |
Compared with VCA2615PFBT, the VCA2615RGZT offers superior thermal management for high-density arrays; compared with VCA2616RGZT, it delivers 3.4× lower input-referred noise at low gain settings - directly improving detectability of low-amplitude echoes in deep-tissue imaging.
Availability
VCA2615RGZT is available at Aetrix Electronics and suitable for medical ultrasound systems, portable diagnostic devices, and industrial NDT equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing for FDA-regulated production.
Supply support for VCA2615RGZT 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 precision signal chain solutions.
The VCA2615RGZT belongs to TI's ultrasound analog front-end (AFE) product line, engineered specifically for high-performance, low-noise RF receive paths in medical and industrial imaging systems.
FAQ
What is the maximum input voltage the VCA2615RGZT can handle before clipping?
The VCA2615RGZT supports up to 5VPP symmetrical input overload voltage across all LNP gain settings. At linear operation, maximum input voltage varies by gain: 2.3VPP at 3dB, 0.78VPP at 12dB, 0.39VPP at 18dB, and 0.23VPP at 22dB. This staged headroom protects the LNP while maintaining optimal SNR for weak-signal amplification - a key requirement in VCA2615RGZT-based ultrasound receivers.
How does the VCA2615RGZT achieve active termination without external resistors?
The VCA2615RGZT integrates four programmable feedback resistors (130Ω to 1500Ω) controlled by FB1–FB4 pins. Selecting a resistor value configures the LNP's input impedance to match transducer characteristics, enabling active termination that incurs only 3dB SNR loss versus the 6dB loss of passive termination. This architecture is intrinsic to the VCA2615RGZT design and eliminates external component count and layout sensitivity.
Can the VCA2615RGZT drive a 50Ω load directly?
No - the VCA2615RGZT specifies a minimum output load of 100Ω for proper operation. Driving 50Ω loads violates the absolute maximum rating and causes excessive current draw, distortion, and potential damage. The device's 3Ω output impedance is designed for 500Ω+ loads; for 50Ω interfaces, external buffering or impedance transformation is required. This limitation applies uniformly across all VCA2615RGZT operating conditions.
What is the purpose of the CEXTA1/CEXTA2 and CEXTB1/CEXTB2 pins on the VCA2615RGZT?
CEXTA1/CEXTA2 and CEXTB1/CEXTB2 are external capacitor connections for the LNP's output buffer compensation network. Each pair requires 3.9µF capacitors (as specified in the datasheet) to stabilize the buffer and ensure flat frequency response up to 42MHz. Omitting or undersizing these capacitors causes peaking, gain instability, and degraded harmonic distortion - critical parameters for VCA2615RGZT performance in ultrasound applications.
Does the VCA2615RGZT support independent gain control for each channel?
No - the VCA2615RGZT uses a single VCNTL input shared by both channels, enforcing synchronized VGA gain control. However, LNP gain (G1/G2) and active termination (FB1–FB4) are independently configurable per channel, allowing asymmetric front-end tuning. This architecture balances channel coherence for beamforming with flexibility in transducer interface optimization - a deliberate feature of the VCA2615RGZT design.
VCA2615RGZT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 2
- Output Type:
- Differential
- Slew Rate:
- 100V/µs
- Gain Bandwidth Product:
- 42 MHz
- -3db Bandwidth:
- 50 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- -
- Current - Output / Channel:
- 60 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-VQFN (7x7)
VCA2615RGZT FAQ
1.How can I place an order for VCA2615RGZT through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA2615RGZT 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 VCA2615RGZT reliable?
The price and inventory of VCA2615RGZT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA2615RGZT is usually 5 days.
3.What payment methods are accepted for VCA2615RGZT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA2615RGZT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA2615RGZT?
VCA2615RGZT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA2615RGZT 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 VCA2615RGZT?
For technical support, including VCA2615RGZT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA2615RGZT requirements.
6.How does Aetrix verify that VCA2615RGZT is sourced from the original manufacturer or authorized distributors?
All VCA2615RGZT 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 VCA2615RGZT meets industry standards.
7.What is the process for return or replacement of VCA2615RGZT?
All VCA2615RGZT units undergo pre-shipment inspection (PSI). If there is an issue with VCA2615RGZT, 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 VCA2615RGZT part is unused and in its original packaging.
Return procedure for VCA2615RGZT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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