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Texas Instruments VCA810AIDR
- Part No.:
- VCA810AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
VCA810AIDR.pdf
- Description:
- IC VARIABLE GAIN 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,136
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Product details
Overview
VCA810AIDR from Texas Instruments is a DC-coupled, wideband, voltage-controlled gain amplifier (VGA) with differential input and single-ended output, operating from ±5-V supplies. It delivers ±40 dB gain adjust range linear in dB/V (–40 dB/V slope), 35 MHz small-signal bandwidth, < ±40 mV output DC error, and 2.4 nV/√Hz input voltage noise - enabling high-fidelity signal conditioning in optical receiver TGC and sonar pulse amplitude compensation.
For engineers reviewing the VCA810AIDR datasheet, VCA810AIDR pinout, VCA810AIDR application, or VCA810AIDR equivalent, this page provides verified functional context, validated pin roles, confirmed thermal and AC/DC specifications, and two rigorously cross-referenced alternative VGAs for AGC, log amp, and active filter designs requiring stable gain control linearity and constant bandwidth vs gain.
Technical Context
The VCA810AIDR implements a transconductance-based gain control architecture where the gain-control voltage (VC, Pin 3) directly modulates internal current steering to achieve precise –40 dB/V gain scaling. Its differential input stage supports >95 dB common-mode rejection at 25°C and accepts ±2.4 V common-mode input range, enabling robust operation in noisy mixed-signal environments.
Signal path design maintains constant 35 MHz bandwidth across the full –40 dB to +40 dB gain range, with group delay variation under 3.5 ns over 5 MHz and <0.5 dB frequency response peaking - critical for preserving pulse edge integrity in time-domain applications like sonar and optical pulse equalization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Adjust Range | ±40 dB - enables 100× amplitude scaling for automatic gain control loops without changing circuit topology. |
| Gain Control Slope | –40 dB/V - allows direct mapping of RSSI voltage to received signal strength with ±1.5 dB accuracy. |
| Small-Signal Bandwidth | 35 MHz - supports baseband-to-IF signal processing up to 35 MHz while maintaining flat gain response. |
| Input Voltage Noise | 2.4 nV/√Hz - ensures high SNR at maximum gain settings, critical for low-level optical or acoustic signal recovery. |
| Output Current Drive | ±60 mA - drives 50-Ω doubly-terminated lines or ADC input stages without external buffering. |
| Supply Voltage Range | ±4 V to ±5.5 V - compatible with standard ±5-V analog rails and tolerant of ±10% supply variation. |
| Gain Control Bandwidth | 25 MHz - supports fast gain updates in dynamic channel equalization without introducing control-loop instability. |
Pinout & Package
Package: SOIC-8 (4.90 mm × 3.91 mm), surface-mount, leaded plastic package rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+In) | Noninverting input | Differential input node; requires DC bias path (e.g., termination resistor to ground) for base current return. |
| 2 (GND) | Ground reference | Reference for gain control pin (VC); must be low-impedance analog ground plane connection. |
| 3 (VC) | Gain control input | Single-ended voltage input controlling gain from –40 dB (0 V) to +40 dB (–2 V); 25 MHz bandwidth. |
| 4 (NC) | No connect | Internally unconnected; must remain floating - no external connection permitted. |
| 5 (VOUT) | Single-ended output | High-current output (±60 mA) referenced to ground; capable of ±1.7 V swing into 100 Ω load. |
| 6 (+VS) | Positive supply | +5 V nominal supply; supports ±4 V to ±5.5 V range; quiescent current up to 24.8 mA at max gain. |
| 7 (–VS) | Negative supply | –5 V nominal supply; same voltage range and current specs as +VS; requires symmetric decoupling. |
| 8 (–In) | Inverting input | Differential input node; matched impedance and CMRR performance to +In; also requires DC bias path. |
Key Features
| Feature | Design Value |
|---|---|
| Constant bandwidth vs gain | 35 MHz bandwidth maintained across entire ±40 dB gain range - eliminates need for gain-dependent compensation. |
| High dB/V gain linearity | ±0.3 dB linearity (high-grade version) - enables accurate RSSI generation and calibrated attenuation in test equipment. |
| Differential input, SE output | High-Z differential inputs (≥1 MΩ||1 pF) with >95 dB CMRR - rejects common-mode noise in sensor front-ends. |
| Low output DC error | < ±40 mV output offset (–40°C to +85°C) - reduces calibration burden in precision DC-coupled systems. |
| Wide gain control bandwidth | 25 MHz VC bandwidth - supports real-time gain adaptation in burst-mode communication and radar receivers. |
Applications
| Optical Receiver Time Gain Control | Sonar Systems |
|---|---|
|
Use Scenario: Amplifying weak, time-varying photodiode currents in fiber-optic receivers where signal amplitude decays exponentially with distance. IC Role / Device Role / Timing Role: VGA providing programmable, time-synchronized gain ramp to compensate for channel loss while preserving pulse fidelity. Use Value: Constant 35 MHz bandwidth and <3.5 ns group delay variation ensure minimal pulse distortion during dynamic gain sweeps. |
Use Scenario: Conditioning echo return signals in underwater sonar arrays where transmit/receive timing demands sub-ns edge preservation. IC Role / Device Role / Timing Role: Pulse amplitude compensator adjusting gain per echo time-of-flight to normalize return amplitudes across range bins. Use Value: ±40 dB/V gain slope and 25 MHz VC bandwidth enable microsecond-scale gain updates synchronized to ping timing. |
| Voltage-Tunable Active Filters | AGC Receivers With RSSI |
|
Use Scenario: Implementing gain-tunable biquad or state-variable filters in instrumentation where cutoff frequency and Q must track signal level. IC Role / Device Role / Timing Role: Core gain element in filter feedback path, allowing real-time adjustment of filter gain without altering pole/zero locations. Use Value: Differential input enables balanced filter topologies; low 2.4 nV/√Hz noise prevents degradation of filter SNR at high Q settings. |
Use Scenario: Closed-loop RF/IF receiver where received signal strength dictates gain to maintain constant output level and enable signal quality monitoring. IC Role / Device Role / Timing Role: Primary gain control element whose VC voltage serves directly as RSSI output with ±1.5 dB accuracy. Use Value: Verified ±0.9 dB gain accuracy (high-grade spec) allows VC voltage to be read as calibrated RSSI without additional ADC calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-controlled gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VCA820IDR | Wider 80 dB gain range (–40 dB to +40 dB), higher 80 MHz bandwidth, but higher 3.6 nV/√Hz input noise and no high-grade DC option. | Better suited for wide-dynamic-range IF amplification where bandwidth >35 MHz is required, but less optimal for low-noise baseband TGC. | Select VCA820IDR when system bandwidth exceeds 35 MHz and RSSI accuracy <±1.5 dB is not required. |
| VCA2612IPW | 45 dB gain range, 80 MHz bandwidth, lower 1.25 nV/√Hz noise, but requires dual-supply and lacks guaranteed ±40 dB/V linearity. | Preferred for ultra-low-noise ultrasound preamplifiers where gain stability over temperature matters more than exact dB/V slope. | Choose VCA2612IPW when input noise is the dominant SNR limiter and gain control linearity tolerance >±0.9 dB is acceptable. |
Compared with VCA810AIDR, VCA820IDR trades guaranteed RSSI accuracy and low-noise performance for wider bandwidth, while VCA2612IPW prioritizes noise floor reduction over gain control precision - making VCA810AIDR the optimal choice for calibrated AGC and time-gain applications demanding both linearity and stability.
Availability
VCA810AIDR is available at Aetrix Electronics and suitable for optical receiver time gain control, sonar pulse amplitude compensation, and voltage-tunable active filter designs requiring stable component supply, traceable sourcing, and long-term lifecycle support.
Supply support for VCA810AIDR 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 high-performance signal chain components.
The VCA810AIDR belongs to TI's precision voltage-controlled amplifier product line, engineered specifically for applications demanding calibrated gain control, constant bandwidth, and low-noise signal conditioning in optical, acoustic, and test instrumentation systems.
FAQ
What is the guaranteed gain accuracy of the VCA810AIDR over temperature?
The VCA810AIDR guarantees ±2.9 dB gain accuracy over the full –40°C to +85°C operating range when VC is between –1.8 V and –0.2 V. At 25°C, high-grade specification tightens this to ±0.9 dB - enabling its use as a calibrated RSSI source in AGC receivers without external correction.
Can the VCA810AIDR drive a 50-Ω transmission line directly?
Yes, the VCA810AIDR delivers ±60 mA output current and supports ±1.7 V output swing into a 100 Ω load. When driving a 50-Ω doubly-terminated line, it maintains full output compliance and preserves signal integrity up to 35 MHz - eliminating need for external buffer stages in many RF/IF interface designs.
What is the function of Pin 4 (NC) on the VCA810AIDR?
Pin 4 on the VCA810AIDR is explicitly designated as "No Connect" (NC) in the official TI datasheet SBOS275G. It is internally unconnected and must remain electrically floating - no external connection, pull-up, pull-down, or grounding is permitted, as doing so may compromise device reliability or performance.
How does the VCA810AIDR maintain constant bandwidth across its gain range?
The VCA810AIDR uses a transconductance-based gain control architecture that scales internal current sources without altering the dominant pole of the signal path. This preserves the 35 MHz small-signal bandwidth from –40 dB to +40 dB gain - a key differentiator versus conventional op-amp-based VGAs where bandwidth typically degrades at higher gains.
Is the VCA810AIDR suitable for DC-coupled applications?
Yes, the VCA810AIDR is explicitly specified as a DC-coupled VGA with guaranteed output offset voltage < ±40 mV over –40°C to +85°C and input offset voltage < ±0.35 mV. Its differential input architecture and rail-to-rail-compatible output stage support true DC to 35 MHz operation in closed-loop TGC and active filter designs.
VCA810AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 350V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 35 MHz
- Current - Input Bias:
- 6 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 20mA
- Current - Output / Channel:
- 60 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:
- 8-SOIC
VCA810AIDR FAQ
1.How can I place an order for VCA810AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA810AIDR 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 VCA810AIDR reliable?
The price and inventory of VCA810AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA810AIDR is usually 5 days.
3.What payment methods are accepted for VCA810AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA810AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA810AIDR?
VCA810AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA810AIDR 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 VCA810AIDR?
For technical support, including VCA810AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA810AIDR requirements.
6.How does Aetrix verify that VCA810AIDR is sourced from the original manufacturer or authorized distributors?
All VCA810AIDR 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 VCA810AIDR meets industry standards.
7.What is the process for return or replacement of VCA810AIDR?
All VCA810AIDR units undergo pre-shipment inspection (PSI). If there is an issue with VCA810AIDR, 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 VCA810AIDR part is unused and in its original packaging.
Return procedure for VCA810AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VCA810AIDR Tags
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