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Texas Instruments VCA2615RGZR
- Part No.:
- VCA2615RGZR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
VCA2615RGZR.pdf
- Description:
- IC VARIABLE GAIN 2 CIRC 48VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,365
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Product details
Overview
VCA2615RGZR from Texas Instruments is a dual-channel, low-noise variable-gain amplifier integrating a programmable Low-Noise Preamplifier (LNP) and a linear-in-dB VGA. It delivers 0.7nV/√Hz input-referred noise, 42MHz bandwidth, 52dB gain control range, ±0.33dB channel-to-channel gain matching, and operates from a single +5V supply. It is engineered for ultrasound receive-path signal conditioning in medical imaging systems.
For engineers reviewing the VCA2615RGZR datasheet, VCA2615RGZR pinout, VCA2615RGZR application, or VCA2615RGZR equivalent, key selection criteria include input-referred noise performance at varying VCNTL voltages, active termination flexibility via FB1–FB4 pins, differential output clipping level control (VCLMP), H/L post-gain switching, and QFN-48 thermal pad grounding requirements.
Technical Context
The VCA2615RGZR implements a cascaded LNP–VGA architecture with independent digital gain programming (G1/G2 for LNP; VCNTL for VGA) and analog post-gain selection (H/L). Its LNP uses active feedback networks (FB1–FB4) to set input impedance from 130Ω to 1.5kΩ without external resistors, optimizing SNR for transducer interface.
The VGA features true variable-gain topology-reducing both gain and its own noise contribution simultaneously-unlike attenuator+fixed-amplifier architectures. Gain slope is tightly controlled at 22dB/V across 0.4V–2.0V VCNTL, with <±0.9dB gain error and 25ns overload recovery time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Density | 0.7nV/√Hz input-referred - enables high-SNR reception of weak echo signals in 10-/12-bit ultrasound ADC chains. |
| Bandwidth | 42MHz upper −3dB point - supports wideband B-mode and Doppler processing up to ~20MHz fundamental frequencies. |
| Gain Control Range | 52dB (VCNTL = 0.2V–2.5V) - provides sufficient dynamic range to handle >100dB acoustic echo amplitude variation. |
| LNP Gain Settings | 3, 12, 18, 22dB (via G1/G2) - allows optimization of transducer interface gain staging without external components. |
| Input Impedance Control | Programmable via FB1–FB4 (5 values: 130Ω–1.5kΩ) - enables active termination matching to diverse piezoelectric transducer impedances. |
| Output Clipping Level | Adjustable via VCLMP (0.25V–2.6V) - prevents ADC saturation during near-field echoes while preserving far-field sensitivity. |
| Power Dissipation | 154mW/channel at full operation - supports dense multi-channel beamformer layouts with thermal vias on QFN-48 package. |
Pinout & Package
Package: QFN-48 (7mm × 7mm, 0.5mm pitch), thermally enhanced with exposed ground pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCAIN+A / VCAIN−A VCAIN+B / VCAIN−B | Differential VGA inputs | Accept externally selected signals (via VCAINSEL) or internally routed LNP outputs; support SE or diff drive. |
| LNPOUT+A / LNPOUT−A LNPOUT+B / LNPOUT−B | Differential LNP buffered outputs | Provide CW processing path or feed internal VGA; rail-to-rail swing capability (3.3VPP into ≥500Ω). |
| FB1–FB4 | LNP feedback resistor select | Digitally configure one of five integrated feedback resistors (130Ω–1500Ω) to match transducer source impedance. |
| VCNTL | VGA gain control voltage | Analog input (0.2V–2.5V) setting VGA gain with 22dB/V linearity; 0.6µs response to 90% level. |
| VCLMP | Output clipping threshold | Analog voltage (0.25V–2.6V) defining differential output clipping level; ±50mV accuracy at 0.5V clamp. |
| H/L | VGA post-gain mode | Logic input selecting +6dB (H) or 0dB (L) final gain stage - optimizes output swing for specific ADC full-scale range. |
Key Features
| Feature | Design Value |
|---|---|
| Active LNP termination | Eliminates need for external parallel resistors; reduces SNR penalty from 6dB to 3dB vs passive termination. |
| Linear-in-dB VGA control | 22dB/V gain slope ensures predictable, monotonic gain adjustment across full 52dB range without calibration. |
| Dual power-down modes | Independent LNP (PDL) and VGA (PDV) shutdown reduce total power to 95mW or 236mW respectively. |
| Channel-to-channel matching | ±0.33dB gain error and ±1ns delay matching enable coherent beamforming across adjacent channels. |
| Clipping-level programmability | VCLMP pin allows real-time adaptation of output limiting threshold to avoid ADC saturation during motion artifacts. |
Applications
| Medical Ultrasound Beamforming | Industrial NDT Receiver |
|---|---|
Use Scenario: Signal conditioning in phased-array ultrasound front-end before digitization by 10-/12-bit ADCs. IC Role / Device Role / Timing Role: Dual-channel LNP+VGA performs low-noise amplification, dynamic range compression, and transducer impedance matching. Use Value: 0.7nV/√Hz noise floor preserves weak echo fidelity; 52dB gain control accommodates >100dB acoustic dynamic range. | Use Scenario: High-fidelity echo amplification in portable ultrasonic flaw detectors for metal/ceramic inspection. IC Role / Device Role / Timing Role: Receives and conditions pulsed-echo signals from broadband piezoelectric transducers operating at 1–15MHz. Use Value: Programmable input impedance (130Ω–1.5kΩ) matches diverse probe types; 42MHz bandwidth supports high-resolution TOF measurements. |
| Ultrasound Research Platform | Portable Doppler System |
Use Scenario: Configurable analog front-end in FPGA-based ultrasound research hardware for algorithm development. IC Role / Device Role / Timing Role: Provides reprogrammable LNP gain (3/12/18/22dB) and VGA control (VCNTL) for rapid parameter sweeps. Use Value: Digital configuration (G1/G2/FB1–FB4) and analog control (VCNTL/VCLMP) enable real-time adaptation without hardware changes. | Use Scenario: Compact continuous-wave Doppler receiver in handheld vascular screening devices. IC Role / Device Role / Timing Role: Amplifies low-level Doppler-shifted signals with differential outputs driving quadrature demodulators. Use Value: Buffered differential LNP outputs (LNPOUT±) provide clean CW processing path; low 1pA/√Hz current noise minimizes phase 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 |
|---|---|---|---|
| VCA2615PFBT | Same die, TQFP-48 package (58°C/W θJA vs 29.1°C/W for QFN); no thermal pad; larger footprint. | Suitable for legacy PCBs with TQFP land patterns; less efficient thermal dissipation limits high-density channel count. | Select when board layout prohibits QFN or requires through-hole compatibility. |
| VCA2616RGZR | Attenuator+fixed-gain architecture; higher input noise (1.1nV/√Hz); same pinout but different internal gain/noise trade-off. | Better suited for cost-sensitive systems where ultra-low noise is secondary to component count reduction. | Choose only if system-level noise budget permits 0.4nV/√Hz degradation and lower gain accuracy is acceptable. |
Compared with VCA2615RGZR, the VCA2615PFBT offers identical electrical performance in a larger, less thermally efficient package, while the VCA2616RGZR trades 0.4nV/√Hz noise advantage for simpler architecture-making VCA2615RGZR optimal for high-fidelity medical imaging where SNR is critical.
Availability
VCA2615RGZR is available at Aetrix Electronics and suitable for medical ultrasound beamforming, industrial NDT receivers, and portable Doppler systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for VCA2615RGZR 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 deep expertise in precision signal chain solutions.
The VCA2615RGZR belongs to TI's ultrasound analog front-end portfolio, designed specifically to meet the low-noise, wide-dynamic-range, and multi-channel synchronization demands of medical and industrial imaging systems.
FAQ
What is the input-referred noise performance of the VCA2615RGZR across its gain range?
The VCA2615RGZR achieves 0.7nV/√Hz input-referred voltage noise at maximum LNP gain (22dB) and VCNTL = 2.5V. Noise increases to ~1nV/√Hz at minimum VGA gain (VCNTL = 0.2V), remaining stable across temperature (−40°C to +85°C). This is confirmed in Figures 18–19 of the SBOS316D datasheet, with all measurements referenced to the LNP input under RS = 0Ω conditions. The VCA2615RGZR maintains this performance without external components.
How does the active termination via FB1–FB4 pins improve system SNR compared to passive termination?
The VCA2615RGZR's active termination using FB1–FB4 selects integrated feedback resistors (130Ω–1500Ω), enabling precise transducer impedance matching without external resistors. This architecture incurs only a 3dB SNR penalty versus the 6dB loss typical of passive parallel termination. As detailed in the Theory of Operation section (page 15), this preserves weak-signal integrity critical for deep-tissue ultrasound imaging-directly benefiting VCA2615RGZR system-level sensitivity.
Can the VCA2615RGZR support both single-ended and differential input configurations?
Yes, the VCA2615RGZR supports both configurations. Its LNP accepts single-ended inputs at LNPIN+A/B (with LNPIN−A/B tied to reference), and differential inputs across LNPIN± pairs. The VGA also accepts either internally routed LNP outputs or external signals via VCAIN± pins, selectable by the VCAINSEL pin. This flexibility is documented in the Functional Block Diagram (page 2) and Pin Configuration table (page 5), ensuring robust interfacing with diverse transducer and signal routing topologies in the VCA2615RGZR design.
What is the purpose of the VCLMP pin on the VCA2615RGZR, and what voltage range is valid?
The VCLMP pin on the VCA2615RGZR sets the differential output clipping threshold to prevent ADC saturation during high-amplitude near-field echoes. It accepts an analog voltage from 0.25V to 2.6V, with ±50mV accuracy at mid-range (e.g., 0.5V). As shown in Figure 48, this adjusts the output peak-to-peak swing from ~0.4V to 5.2V. This feature is unique to the VCA2615RGZR among TI's VCA family and enables adaptive dynamic range control without external clamping circuits.
Does the VCA2615RGZR require external bypass capacitors, and if so, where are they placed?
Yes, the VCA2615RGZR requires external bypass capacitors: a 0.01µF capacitor between VB and GNDA/GNDB (pins 9, 11, 26, 37), and a 0.1µF capacitor between VCM and GNDR (pins 19, 20). These are specified in the Pin Configuration table (page 5) and Figure 53 (Theory of Operation, page 15). CEXTA1/A2/B1/B2 (pins 2/3/34/35) are optional external capacitors for VGA frequency compensation-omitting them defaults to 42MHz bandwidth. All bypassing is mandatory for stable operation of the VCA2615RGZR.
VCA2615RGZR 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)
VCA2615RGZR FAQ
1.How can I place an order for VCA2615RGZR through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA2615RGZR 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 VCA2615RGZR reliable?
The price and inventory of VCA2615RGZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA2615RGZR is usually 5 days.
3.What payment methods are accepted for VCA2615RGZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA2615RGZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA2615RGZR?
VCA2615RGZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA2615RGZR 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 VCA2615RGZR?
For technical support, including VCA2615RGZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA2615RGZR requirements.
6.How does Aetrix verify that VCA2615RGZR is sourced from the original manufacturer or authorized distributors?
All VCA2615RGZR 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 VCA2615RGZR meets industry standards.
7.What is the process for return or replacement of VCA2615RGZR?
All VCA2615RGZR units undergo pre-shipment inspection (PSI). If there is an issue with VCA2615RGZR, 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 VCA2615RGZR part is unused and in its original packaging.
Return procedure for VCA2615RGZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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