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Texas Instruments VCA824IDGST
- Part No.:
- VCA824IDGST
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
VCA824IDGST.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:360
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Product details
Overview
VCA824IDGST from Texas Instruments is a DC-coupled, ultra-wideband, linear-in-V/V variable gain amplifier (VGA) with differential input and single-ended output. It delivers 710-MHz small-signal bandwidth at G = 2 V/V, 0.1-dB gain flatness to 135 MHz, 2500-V/µs slew rate, >40-dB gain adjust range, and ±90 mA output current - enabling high-fidelity pulse amplitude compensation in high-speed video and data acquisition systems.
For engineers reviewing the VCA824IDGST datasheet, VCA824IDGST pinout, VCA824IDGST application, or VCA824IDGST equivalent, key selection criteria include gain linearity over ±1 V control voltage, 135-MHz 0.1-dB flatness for composite video equalization, output drive capability into 100-Ω loads, and SOIC-14/VSSOP-10 package compatibility with high-density analog signal chains.
Technical Context
The VCA824IDGST integrates two input buffers and a current-feedback output amplifier with an internal multiplier core, eliminating need for external gain-setting op-amps. Its gain is set externally via RG+ and RG– pins, supporting nominal maximum gains from 2 V/V to 40 V/V using resistor networks.
Gain control operates linearly in V/V across VG = –1 V to +1 V, delivering precise attenuation (e.g., 10 V/V → 0.1 V/V) without logarithmic compression. The architecture maintains high common-mode rejection (65 dB min) and low input offset drift (±30 µV/°C), critical for DC-coupled instrumentation and baseband equalization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth | 710 MHz at G = 2 V/V - supports RF IF sampling and wideband test equipment front-ends |
| 0.1-dB Gain Flatness | 135 MHz - ensures minimal amplitude distortion in SD/HD video and serial digital interfaces |
| Slew Rate | 2500 V/µs - enables clean 4-VPP large-signal response up to 320 MHz |
| Output Current | ±90 mA - drives 100-Ω loads directly without external buffers |
| Gain Control Range | >40 dB linear-in-V/V - provides precise analog gain scaling for automatic level control loops |
| Input Voltage Noise | 6 nV/√Hz - preserves SNR in low-level signal amplification stages |
| Supply Voltage | ±5 V (±4 V to ±6 V operating range) - compatible with standard dual-rail analog power domains |
Pinout & Package
Package: SOIC-14 (8.65 mm × 3.91 mm) - surface-mount, industry-standard footprint with thermal pad not required; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VIN | Differential input noninverting | Accepts high-impedance single-ended or differential input signals; CM input range ±2.1 V |
| –VIN | Differential input inverting | Completes differential pair; enables common-mode rejection and noise cancellation |
| +RG / –RG | External gain resistor terminals | Set maximum gain (2–40 V/V) via external resistor network; determines transconductance scaling |
| VG | Analog gain control voltage input | Linear V/V control from –1 V to +1 V; 30 µA bias current requires low-impedance driver |
| FB | Inverting input of output buffer | Connects to external feedback resistor (RF); sets closed-loop gain and stability margin |
| VOUT | Single-ended output | Delivers ±3.6 V swing into 1-kΩ load; ±3.6 V into 100-Ω load with 90-mA sourcing capability |
| +VCC / –VCC | Positive/negative supply rails | Support ±5-V operation; quiescent current 37.5 mA typical at VG = 0 V |
| GND | Analog ground reference | Low-impedance return path for input/output currents; separate from digital ground in mixed-signal layouts |
Key Features
| Feature | Design Value |
|---|---|
| Differential-to-single-ended conversion | Eliminates need for external balun or transformer in ADC driver applications |
| DC-coupled signal path | Enables baseband gain control without AC coupling capacitors or DC restoration circuits |
| High gain accuracy | ±0.3-dB max deviation at 20-dB setting - reduces calibration overhead in precision instrumentation |
| Current-feedback output stage | Provides wide bandwidth independent of closed-loop gain - avoids traditional op-amp gain-bandwidth tradeoff |
| Integrated multiplier core | Ensures monotonic, linear-in-V/V gain law across full control voltage range without external components |
Applications
| Differential Line Receivers | Differential Equalizers |
|---|---|
Use Scenario: Receiving high-speed LVDS or RS-422 signals over lossy PCB traces or cables with frequency-dependent attenuation. IC Role / Device Role / Timing Role: VGA compensates for channel loss by boosting high-frequency components while preserving DC and low-frequency integrity. Use Value: Restores 135-MHz 0.1-dB flatness to degraded eye diagrams, enabling reliable 1-Gbps data recovery without DSP equalization. | Use Scenario: Compensating RC roll-off in video distribution networks or backplane interconnects. IC Role / Device Role / Timing Role: Acts as active peaking filter with programmable boost profile controlled by VG voltage. Use Value: Corrects differential gain/phase (dG/dP) errors below 0.04% and 0.045°, meeting SMPTE 259M broadcast standards. |
| Pulse Amplitude Compensation | Variable Attenuators |
Use Scenario: Stabilizing pulse height in time-of-flight (ToF) sensors or laser diode drivers where temperature-induced gain drift affects measurement accuracy. IC Role / Device Role / Timing Role: Provides closed-loop gain adjustment via DAC-driven VG to maintain constant pulse amplitude across environmental conditions. Use Value: Achieves ±0.3-dB gain stability over –40°C to +85°C, reducing system calibration frequency by >5×. | Use Scenario: Implementing analog automatic gain control (AGC) in RF receiver IF stages or optical transceiver TIA outputs. IC Role / Device Role / Timing Role: Functions as voltage-controlled attenuator with >40-dB dynamic range and nanosecond-scale settling (11 ns to 0.01%). Use Value: Enables real-time signal leveling without switching artifacts or harmonic distortion spikes seen in switched-resistor networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VCA822IDGSR | Same 40-dB gain range and 420-MHz bandwidth at G=10 V/V, but only 10-pin VSSOP package; no SOIC option | Limited to space-constrained designs; lacks SOIC-14 for prototyping or legacy board compatibility | Select when board area is critical and SOIC footprint is unnecessary |
| VCA821IDGSR | Higher 420-MHz bandwidth at G=10 V/V, but lower 6.0-nV/√Hz input noise vs. VCA824's 6.0-nV/√Hz; identical pinout and control interface | Better suited for low-noise IF amplification; same gain linearity and control voltage range | Select when input-referred noise dominates system SNR budget |
Compared with VCA824IDGST, VCA822IDGSR offers identical performance in VSSOP-10 but no SOIC variant, while VCA821IDGSR improves noise by 0.5 nV/√Hz at the cost of slightly reduced output drive (±70 mA). All three share pin-compatible control and gain-setting architecture.
Availability
VCA824IDGST is available at Aetrix Electronics and suitable for differential line receivers, video equalizers, and pulse amplitude compensation systems requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade reliability.
Supply support for VCA824IDGST 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 connectivity technologies with over 90 years of innovation in high-performance signal chain solutions.
The VCA824 belongs to TI's Ultra-Wideband Variable Gain Amplifier product line, engineered for DC-coupled, high-fidelity analog gain control in video, test & measurement, and high-speed data acquisition systems.
FAQ
What is the maximum recommended supply voltage for the VCA824IDGST?
The VCA824IDGST supports a maximum operating voltage of ±6 V per the Absolute Maximum Ratings table. Operation at ±6 V is specified across –40°C to +85°C and maintains all electrical characteristics within datasheet limits, including 710-MHz bandwidth and ±90-mA output current. Exceeding ±6 V risks permanent damage.
Does the VCA824IDGST support true differential input operation?
Yes, the VCA824IDGST accepts fully differential inputs via +VIN and –VIN pins, providing 65-dB minimum common-mode rejection ratio (CMRR) at 25°C. This enables noise rejection in balanced transmission lines and eliminates even-order harmonics in symmetric signal paths - a key advantage over single-ended VGAs like the VCA820.
How does gain control linearity perform across temperature for the VCA824IDGST?
At AVMAX = 10 V/V, the VCA824IDGST exhibits ±0.37-dB max gain deviation over –40°C to +85°C for VG = 0 V to 1 V. This tight linearity is achieved through on-chip trimming and matched transistor pairs, ensuring consistent AGC loop behavior without software compensation in industrial temperature environments.
Can the VCA824IDGST drive a 50-Ω load directly?
The VCA824IDGST is characterized for 100-Ω loads (±3.6 V swing), but can drive 50-Ω loads with minor derating: output swing drops to ±3.2 V at –40°C to +85°C, and large-signal bandwidth decreases to ~280 MHz. For full-spec 50-Ω drive, add a 50-Ω series resistor at the output to match impedance while preserving stability.
What is the purpose of the VREF pin on the VCA824IDGST?
The VCA824IDGST does not have a VREF pin. Pin 9 in the SOIC-14 package is labeled VREF in older revisions but is functionally the non-inverting input of the internal output buffer - used only in specialized configurations with external feedback; it is not a reference voltage source and must be tied to a stable DC potential (e.g., ground or mid-supply) if unused.
VCA824IDGST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2500V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 710 MHz
- Current - Input Bias:
- 19 µA
- Voltage - Input Offset:
- 4 mV
- Current - Supply:
- 36.5mA
- Current - Output / Channel:
- 90 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSSOP
VCA824IDGST FAQ
1.How can I place an order for VCA824IDGST through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA824IDGST 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 VCA824IDGST reliable?
The price and inventory of VCA824IDGST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA824IDGST is usually 5 days.
3.What payment methods are accepted for VCA824IDGST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA824IDGST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA824IDGST?
VCA824IDGST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA824IDGST 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 VCA824IDGST?
For technical support, including VCA824IDGST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA824IDGST requirements.
6.How does Aetrix verify that VCA824IDGST is sourced from the original manufacturer or authorized distributors?
All VCA824IDGST 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 VCA824IDGST meets industry standards.
7.What is the process for return or replacement of VCA824IDGST?
All VCA824IDGST units undergo pre-shipment inspection (PSI). If there is an issue with VCA824IDGST, 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 VCA824IDGST part is unused and in its original packaging.
Return procedure for VCA824IDGST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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