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Texas Instruments VCA822IDG4
- Part No.:
- VCA822IDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
VCA822IDG4.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,757
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Product details
Overview
VCA822IDG4 from Texas Instruments is a DC-coupled, wideband variable gain amplifier (VGA) with linear-in-V/V gain control, 150-MHz small-signal bandwidth at +10 V/V gain, 0.1-dB gain flatness to 28 MHz, and ±160 mA output current. It operates from ±5-V supplies and serves in differential line receivers, pulse amplitude compensation, and voltage-tunable active filters.
For engineers reviewing the VCA822IDG4 datasheet, VCA822IDG4 pinout, VCA822IDG4 application, or VCA822IDG4 equivalent, key selection criteria include gain adjust range (>40 dB), slew rate (1700 V/μs), input noise density (8.2 nV/√Hz), thermal resistance (90.3°C/W for SOIC-14), and differential-to-single-ended conversion capability without external buffering.
Technical Context
The VCA822IDG4 integrates two high-impedance input buffers and a current-feedback output stage with an internal multiplier core, enabling true linear-in-V/V gain control via VG while maintaining wideband performance. Its gain is set externally by RG and RF resistors, supporting nominal maximum gains from +2 V/V to +100 V/V.
Gain control is achieved through a dedicated high-impedance VG input (70 kΩ || 1 pF), with linear response over –0.9 V to +1 V, delivering >40 dB of attenuation relative to AVMAX. The device supports differential input operation and provides rail-to-rail output swing into 100 Ω loads (±3.7 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 150 MHz at AVMAX = +10 V/V - enables high-fidelity signal amplification up to UHF frequencies |
| Slew rate | 1700 V/μs - supports fast large-signal transient response without distortion |
| Gain adjust range | >40 dB - allows precise analog gain scaling across four decades of amplitude |
| Input voltage noise | 8.2 nV/√Hz - ensures low-noise amplification critical for sensitive RF/baseband stages |
| Output current | ±160 mA - drives low-impedance loads (e.g., 50 Ω, 75 Ω video lines) directly |
| Gain flatness | 0.1 dB to 28 MHz - maintains amplitude integrity in broadband communication channels |
| Supply voltage | ±5 V (±3.5 V min, ±6.5 V abs max) - compatible with standard dual-rail analog systems |
Pinout & Package
Package: SOIC-14 (8.65 mm × 3.91 mm), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC (Pins 1, 14) | Positive supply | Dual-supply operation; must be decoupled locally to minimize noise coupling |
| –VCC (Pins 7, 8) | Negative supply | Shared ground reference path; pins 7 and 8 are internally connected |
| +VIN (Pin 3) | Noninverting input | Differential input node; high-impedance (0.5 MΩ || 1 pF) for minimal loading |
| –VIN (Pin 6) | Inverting input | Completes differential pair; common-mode rejection ratio ≥60 dB |
| +RG (Pin 4) | Gain set resistor terminal | Connects to one end of external RG; sets nominal maximum gain with –RG |
| –RG (Pin 5) | Gain set resistor terminal | Connects to other end of RG; forms gain-setting network with RF |
| FB (Pin 12) | Feedback resistor input | Connects to RF; defines closed-loop gain and stability with RG |
| VG (Pin 2) | Gain control voltage | Linear-in-V/V control input (70 kΩ || 1 pF); –0.9 V to +1 V range |
| VOUT (Pin 10) | Amplified output | Single-ended output capable of ±3.7 V swing into 100 Ω at ±5 V supplies |
| GND (Pin 11) | Analog ground | Main reference for input/output signals and biasing; separate from power ground |
| NC (Pin 13) | No connection | Unbonded pad; must remain unconnected per TI design guidelines |
| VREF (Pin 9) | Output voltage reference | Internal reference for output common-mode level; not user-accessible in standard operation |
Key Features
| Feature | Design Value |
|---|---|
| DC-coupled architecture | Enables baseband and low-frequency signal processing without AC coupling capacitors |
| Integrated current-feedback output stage | Delivers high output current (±160 mA) and fast settling (11 ns to 0.01%) without external drivers |
| External gain resistor configuration | Supports flexible AVMAX selection between +2 V/V and +100 V/V using RG and RF |
| High gain accuracy | ±0.3 dB typical deviation over 0–1 V VG range at +20 dB AVMAX, ensuring predictable system gain |
| Low harmonic distortion | –66 dBc third-harmonic at 20 MHz, 2 VPP output - suitable for high-fidelity analog signal chains |
| Thermal robustness | Junction-to-ambient thermal resistance of 90.3°C/W (SOIC-14) supports continuous operation at 85°C ambient |
Applications
| Differential Line Receiver | Differential Equalizer |
|---|---|
|
Use Scenario: Receiving high-speed differential data over lossy PCB traces or cables with frequency-dependent attenuation. IC Role / Device Role / Timing Role: Differential-to-single-ended converter with programmable gain to compensate for channel loss and maintain SNR. Use Value: Enables adaptive equalization using RC load compensation (e.g., R = 75 Ω, C = 100 pF) to restore high-frequency content up to 150 MHz. |
Use Scenario: Compensating for high-frequency roll-off in video or serial link interconnects. IC Role / Device Role / Timing Role: Active equalizer with adjustable gain slope to counteract cable-induced attenuation. Use Value: Achieves flat response within 0.1 dB up to 28 MHz, preserving edge integrity in composite video or LVDS applications. |
| Pulse Amplitude Compensation | Variable Attenuator |
|
Use Scenario: Stabilizing pulse amplitude in time-of-flight or laser driver feedback loops where signal strength varies with distance. IC Role / Device Role / Timing Role: Precision VGA modulating pulse height in real time based on control voltage feedback. Use Value: Delivers 137 MHz large-signal bandwidth at 5 VPP, ensuring minimal pulse distortion during amplitude correction. |
Use Scenario: Dynamically adjusting signal level in test equipment or automatic gain control (AGC) loops. IC Role / Device Role / Timing Role: Voltage-controlled attenuator with linear-in-V/V transfer function for predictable dB scaling. Use Value: Provides >40 dB attenuation range with ±0.4 dB absolute gain error, enabling accurate calibration-grade signal leveling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar variable gain amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VCA821IDR | Higher small-signal bandwidth (420 MHz), lower input noise (7.0 nV/√Hz), but same SOIC-14 package and ±5-V supply compatibility. | Better suited for >100 MHz IF/RF gain control; less optimal for cost-sensitive baseband designs due to higher quiescent current. | Select VCA821IDR when bandwidth >200 MHz is required and noise budget is tighter; verify layout for higher-frequency stability. |
| LMH6503MA/NOPB | Drop-in upgrade per TI documentation; identical pinout, similar gain range (–30 dB to +30 dB), but lower slew rate (1200 V/μs) and bandwidth (900 MHz small-signal). | Legacy drop-in replacement with proven field reliability; lacks VCA822's 0.1-dB flatness spec and integrated differential input buffers. | Choose LMH6503MA/NOPB for legacy design refreshes requiring minimal board changes; accept trade-offs in gain linearity and flatness. |
Compared with VCA822IDG4, VCA821IDR offers superior bandwidth and noise performance at higher power, while LMH6503MA/NOPB provides mechanical and functional compatibility for backward-compatible upgrades-neither matches VCA822IDG4's balanced combination of 150-MHz bandwidth, 0.1-dB flatness, and ±160-mA drive capability in a single SOIC-14 solution.
Availability
VCA822IDG4 is available at Aetrix Electronics and suitable for differential line receivers, pulse amplitude compensation systems, and voltage-tunable active filters requiring stable component supply, long-term manufacturability, and consistent parametric performance across temperature.
Supply support for VCA822IDG4 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 amplifiers and signal chain solutions.
The VCA822IDG4 belongs to TI's wideband variable gain amplifier product line, engineered for precision analog signal conditioning in communications, test equipment, and video infrastructure where gain agility, bandwidth, and linearity are critical.
FAQ
What is the maximum gain range supported by the VCA822IDG4?
The VCA822IDG4 supports a gain adjust range exceeding 40 dB, achieved by varying the gain control voltage (VG) from –0.9 V to +1 V relative to its maximum gain (AVMAX). For example, with AVMAX set to +10 V/V (+20 dB), the device delivers gain from +10 V/V down to ~0.1 V/V (–20 dB), yielding >40 dB total range. This behavior is confirmed in the Electrical Characteristics table under "Gain at VG = –0.9 V" and Figure 4 of the SBOS343D datasheet.
Does the VCA822IDG4 require external input or output buffers?
No, the VCA822IDG4 does not require external input or output buffers. Its internal architecture integrates two high-impedance input buffers and a current-feedback output stage, forming a complete variable gain amplifier system. This eliminates the need for additional op-amps or drivers in most applications, as explicitly stated in the "Description" section of the SBOS343D datasheet: "does not require external buffering."
What are the recommended operating conditions for the VCA822IDG4?
The VCA822IDG4 is specified for operation from ±5-V supplies (±3.5 V minimum, ±6.5 V absolute maximum), over a free-air temperature range of –40°C to +85°C. Quiescent current ranges from 33.5 mA to 38 mA depending on temperature and VG, and the device requires proper decoupling on both +VCC and –VCC pins. These values are documented in Section 7.3 ("Recommended Operating Conditions") of the SBOS343D datasheet.
Can the VCA822IDG4 drive a 75-Ω video load directly?
Yes, the VCA822IDG4 can drive a 75-Ω video load directly. Its output delivers ±3.7 V swing into 100 Ω and ±3.5 V into 100 Ω at full temperature range, and it sources/sinks ±160 mA. With appropriate gain setting and output termination, it meets composite video dG/dP specifications (Figure 15), confirming suitability for 75-Ω video distribution and equalization applications per TI's typical characteristics data.
Is the VCA822IDG4 pin-compatible with the LMH6503?
Yes, the VCA822IDG4 is a documented drop-in upgrade to the LMH6503, as stated in the "Applications" section of the SBOS343D datasheet. Both devices share identical SOIC-14 pinouts, supply requirements (±5 V), and functional interface (differential input, single-ended output, VG control). However, VCA822IDG4 improves gain linearity, bandwidth flatness, and output drive capability over the LMH6503.
VCA822IDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1700V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 168 MHz
- Current - Input Bias:
- 19 µA
- Voltage - Input Offset:
- 4 mV
- Current - Supply:
- 36mA
- Current - Output / Channel:
- 160 mA
- Voltage - Supply Span (Min):
- 7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
VCA822IDG4 FAQ
1.How can I place an order for VCA822IDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA822IDG4 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 VCA822IDG4 reliable?
The price and inventory of VCA822IDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA822IDG4 is usually 5 days.
3.What payment methods are accepted for VCA822IDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA822IDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA822IDG4?
VCA822IDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA822IDG4 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 VCA822IDG4?
For technical support, including VCA822IDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA822IDG4 requirements.
6.How does Aetrix verify that VCA822IDG4 is sourced from the original manufacturer or authorized distributors?
All VCA822IDG4 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 VCA822IDG4 meets industry standards.
7.What is the process for return or replacement of VCA822IDG4?
All VCA822IDG4 units undergo pre-shipment inspection (PSI). If there is an issue with VCA822IDG4, 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 VCA822IDG4 part is unused and in its original packaging.
Return procedure for VCA822IDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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