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Texas Instruments VCA8500IRGCTG4
- Part No.:
- VCA8500IRGCTG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 64-VFQFN Exposed Pad
- Datasheet:
-
VCA8500IRGCTG4.pdf
- Description:
- IC VARIABLE GAIN 8 CIRC 64VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,201
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Product details
Overview
VCA8500IRGCTG4 from Texas Instruments is an 8-channel ultralow-power variable gain amplifier with integrated low-noise pre-amplifier (LNA), voltage-controlled attenuator (46dB range), programmable post-gain amplifier (20/25/27/30dB), second-order linear-phase LPF (10/15MHz), and CW switch matrix (8×10). It delivers 0.8nV/√Hz input-referred noise, ±0.25dB channel matching, and 65mW/channel power consumption for ultrasound beamforming front-ends.
For engineers reviewing the VCA8500IRGCTG4 datasheet, VCA8500IRGCTG4 pinout, VCA8500IRGCTG4 application, or VCA8500IRGCTG4 equivalent, key selection criteria include TGC vs CW mode operation, VCNTL voltage-controlled gain slope (44.4 dB/V), clamp-enabled overload recovery (80ns), differential output swing (2VPP), and SPI-controlled PGA gain and filter bandwidth settings.
Technical Context
The VCA8500IRGCTG4 integrates two independent signal paths: a time-gain control (TGC) path with LNA–VCA–PGA–LPF–clamping, and a continuous-wave (CW) Doppler path with 8-input × 10-output current-mode switch matrix and transconductance outputs. Each channel shares a common VCNTL input (0–1.2V) for synchronized 46dB attenuation control.
Gain programming uses a 5-byte SPI interface supporting TGC/CW mode selection, PGA gain (20/25/27/30dB), LPF bandwidth (10/15MHz), clamp enable/disable, and per-channel CW routing. Internal bias voltages (VBL1–VBL8 at +2.4V, VB1–VB6, VCM at +1.65V) require dedicated bypass capacitors per pin per datasheet layout guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LNA Gain | Fixed 20dB; enables high-sensitivity echo detection with 250mVPP linear input range. |
| Variable Gain Range | 46dB via 0–1.2V VCNTL; supports dynamic depth-dependent amplification in ultrasound scanning. |
| PGA Gain Options | Selectable 20/25/27/30dB; sets final system gain stage with ±0.5dB absolute error. |
| Input Voltage Noise | 0.8nV/√Hz at 2MHz; critical for preserving weak echo SNR in portable and mid-range systems. |
| LPF Bandwidth | 10MHz or 15MHz (SPI-selectable); filters out-of-band noise while preserving diagnostic image resolution. |
| Crosstalk | –66dBc worst-case; ensures channel isolation during multi-beam simultaneous receive. |
| Power per Channel | 65mW in TGC mode; enables battery-powered handheld ultrasound without thermal throttling. |
| Overload Recovery | 80ns with clamp enabled; restores valid signal within one RF cycle after strong near-field reflection. |
Pinout & Package
Package: QFN-64 (9×9mm PowerPAD™), RoHS-compliant, exposed thermal pad connected to analog ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1–IN8 | LNA analog inputs | Differential-capable single-ended inputs; each requires AC coupling and 0.1µF bypass on associated VBLx pin. |
| OUT1–OUT8 (paired) | PGA differential outputs | True differential outputs (e.g., OUT1/OUT1) deliver 2VPP swing; require 1kΩ load to ground per side. |
| VCNTL | Attenuator control voltage | Single global input (0–1.2V) controlling all 8 channels' 46dB VCA range with 44.4dB/V slope. |
| PD (Pin 49) | Standby power-down | Active-high logic input; reduces total power to 130mW while retaining register state and bias settings. |
| CW0–CW9 | CW switch matrix outputs | Current-mode outputs (14–18mA/V transconductance); support summing of up to 10 channels for Doppler processing. |
| D_IN / D_OUT / CLK / RST | SPI serial interface | 40-bit register map controls mode, PGA gain, LPF, clamp, and CW routing; RST resets to default configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow-noise LNA | 0.8nV/√Hz input-referred noise at 2MHz enables detection of sub-millimeter tissue structures. |
| Channel-to-channel matching | ±0.25dB gain matching ensures uniform beam sensitivity across all 8 receive channels. |
| Fast overload recovery | 80ns recovery with clamp enabled prevents dead-time loss during high-amplitude reverberation events. |
| Integrated CW switch matrix | 8×10 current-mode matrix allows flexible Doppler channel grouping without external summing resistors. |
| Programmable LPF | Second-order linear-phase filter with 10/15MHz selectable –3dB point maintains pulse fidelity in B-mode imaging. |
| Low-power TGC architecture | 65mW/channel operation enables 8-channel full-beamform capability in portable battery-operated systems. |
Applications
| Ultrasound B-Mode Imaging | Portable Handheld Scanners |
|---|---|
Use Scenario: Real-time grayscale imaging using phased-array transducers with depth-dependent gain compensation. IC Role / Device Role / Timing Role: Primary TGC front-end amplifier providing programmable 46dB gain range and 20dB fixed LNA gain per channel. Use Value: Enables high-resolution tissue differentiation at depths >15cm with <0.8nV/√Hz noise floor and ±0.25dB channel matching. | Use Scenario: Battery-powered point-of-care ultrasound with compact form factor and thermal constraints. IC Role / Device Role / Timing Role: Low-power 8-channel VGA delivering 65mW/channel operation and fast 80ns overload recovery. Use Value: Extends battery life while maintaining clinical image quality through efficient power management and standby mode (130mW total). |
| Mid-Range Ultrasound Systems | CW Doppler Signal Processing |
Use Scenario: Cost-optimized cart-based systems requiring high channel count and moderate performance. IC Role / Device Role / Timing Role: Integrated TGC amplifier with SPI-configurable PGA gain (20–30dB) and dual LPF bandwidths (10/15MHz). Use Value: Reduces BOM count by integrating LNA, VCA, PGA, LPF, and clamping-eliminating six discrete stages per channel. | Use Scenario: Continuous-wave Doppler velocity measurement using beamformed summing of multiple transducer elements. IC Role / Device Role / Timing Role: CW switch matrix (8×10) with current-mode outputs (14–18mA/V) enabling analog summation without op-amps. Use Value: Supports up to 10 simultaneous CW beams with <2dB amplitude variation across temperature (–40°C to +85°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable-gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8336ACPZ-R7 | Single-channel, 120dB gain range, no integrated LNA or LPF; requires external components for full TGC function. | Used in custom-designed ultrasound modules where channel count is low and board space permits discrete integration. | Select when needing wider gain range and higher bandwidth (>100MHz) but accepting increased design complexity and power per channel. |
| VCA822IPWPR | Single-channel, 40dB gain range, no CW matrix or SPI interface; fixed 20dB LNA + 20dB PGA only. | Deployed in legacy or entry-level systems with simpler TGC requirements and no Doppler capability. | Choose for cost-sensitive designs where 8-channel integration, programmable LPF, and CW mode are not required. |
Compared with AD8336ACPZ-R7 and VCA822IPWPR, the VCA8500IRGCTG4 uniquely integrates 8-channel TGC+CW functionality, SPI configurability, and ultralow 65mW/channel power-making it the only single-package solution for modern portable and mid-range ultrasound beamformers.
Availability
VCA8500IRGCTG4 is available at Aetrix Electronics and suitable for ultrasound B-mode imaging, portable handheld scanners, mid-range diagnostic systems, and CW Doppler signal processing requiring stable component supply and long-term production continuity.
Supply support for VCA8500IRGCTG4 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, embedded processing, and digital signal technologies for industrial, automotive, and medical applications.
The VCA8500IRGCTG4 belongs to TI's ultrasound analog front-end (AFE) product line, engineered specifically for low-noise, low-power, multi-channel time-gain control and Doppler signal conditioning in portable and mid-range medical imaging systems.
FAQ
What is the operating temperature range for the VCA8500IRGCTG4?
The VCA8500IRGCTG4 operates over an ambient temperature range of –40°C to +85°C, validated for use in clinical environments and portable ultrasound devices subject to thermal cycling. Its internal bias circuitry and gain matching remain stable across this range, with gain drift ≤±0.5dB and channel matching maintained at ±0.5dB maximum over temperature.
How does the VCA8500IRGCTG4 handle overload conditions in ultrasound receive paths?
The VCA8500IRGCTG4 implements an internal clamping circuit that limits PGA output to 1.7VPP when enabled (CL = 0), recovering valid signal output within 80ns. This fast recovery prevents data loss during strong near-field reflections-critical for maintaining frame rate and image fidelity in real-time B-mode scanning.
Can the VCA8500IRGCTG4 be used in both TGC and CW Doppler modes simultaneously?
No-the VCA8500IRGCTG4 operates exclusively in one mode at a time, selected via bit D5 in the SPI control register: D5 = 1 enables TGC mode (all 8 channels active in LNA–VCA–PGA path), while D5 = 0 enables CW mode (TGC path powered down, CW matrix active). Mode switching requires SPI reconfiguration and incurs ~50µs power-up delay.
What are the supply voltage requirements for the VCA8500IRGCTG4?
The VCA8500IRGCTG4 requires three independent supplies: AVDD1 = 3.15–3.6V (LNA/PGA core), AVDD2 = 4.75–5.25V (VCA/CW circuitry), and DVDD = 3.15–3.6V (digital interface). AVDD1 and DVDD may share a low-noise 3.3V rail if properly decoupled; AVDD2 must be isolated to prevent CW-mode current noise from modulating TGC performance.
Does the VCA8500IRGCTG4 support daisy-chained SPI communication across multiple devices?
No-the VCA8500IRGCTG4 uses a standard 4-wire SPI interface (D_IN, D_OUT, CLK, RST) with no hardware chip-select or daisy-chain capability. Multiple VCA8500IRGCTG4 devices require individual D_IN/D_OUT lines or external multiplexing, as the serial interface lacks addressability or broadcast mode support per datasheet register map.
VCA8500IRGCTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 64-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 8
- Output Type:
- Differential
- Slew Rate:
- -
- Gain Bandwidth Product:
- 15 MHz
- -3db Bandwidth:
- 55 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 10µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 3.15 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-VQFN (9x9)
VCA8500IRGCTG4 FAQ
1.How can I place an order for VCA8500IRGCTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA8500IRGCTG4 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 VCA8500IRGCTG4 reliable?
The price and inventory of VCA8500IRGCTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA8500IRGCTG4 is usually 5 days.
3.What payment methods are accepted for VCA8500IRGCTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA8500IRGCTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA8500IRGCTG4?
VCA8500IRGCTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA8500IRGCTG4 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 VCA8500IRGCTG4?
For technical support, including VCA8500IRGCTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA8500IRGCTG4 requirements.
6.How does Aetrix verify that VCA8500IRGCTG4 is sourced from the original manufacturer or authorized distributors?
All VCA8500IRGCTG4 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 VCA8500IRGCTG4 meets industry standards.
7.What is the process for return or replacement of VCA8500IRGCTG4?
All VCA8500IRGCTG4 units undergo pre-shipment inspection (PSI). If there is an issue with VCA8500IRGCTG4, 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 VCA8500IRGCTG4 part is unused and in its original packaging.
Return procedure for VCA8500IRGCTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VCA8500IRGCTG4 Tags
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