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Texas Instruments VCA822IDRG4
- Part No.:
- VCA822IDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
VCA822IDRG4.pdf
- Description:
- IC VARIABLE GAIN 1 CIRC 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,088
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Product details
Overview
VCA822IDRG4 from Texas Instruments is a DC-coupled, wideband variable gain amplifier (VGA) with linear-in-volt/volt gain control, 150-MHz small-signal bandwidth at +10 V/V maximum gain, 0.1-dB gain flatness to 28 MHz, and ±160 mA output drive capability. It serves as a differential-to-single-ended converter in high-speed signal conditioning chains for video equalization, pulse amplitude compensation, and differential line reception.
For engineers reviewing the VCA822IDRG4 datasheet, VCA822IDRG4 pinout, VCA822IDRG4 application, or VCA822IDRG4 equivalent, key selection criteria include its 40-dB gain adjust range, high slew rate (1700 V/μs), low input voltage noise (8.2 nV/√Hz), and SOIC-14 package compatibility with ±5-V dual supplies.
Technical Context
The VCA822IDRG4 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 without external buffering. Its gain is set externally via RG and RF resistors, supporting nominal AVMAX between +2 V/V and +100 V/V.
Gain control operates over VG = –1 V to +1 V, delivering precise attenuation down to –24 dB relative to AVMAX with ±0.3 dB gain deviation across 0–1 V at 25°C. The architecture maintains stable performance under capacitive loads up to 100 pF when paired with recommended series resistance (RS).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 150 MHz at AVMAX = +10 V/V - supports high-fidelity amplification of fast analog signals without roll-off |
| Gain adjust range | >40 dB - enables wide dynamic range control from full gain to deep attenuation using single VG input |
| Slew rate | 1700 V/μs - ensures faithful reproduction of fast transient edges in pulse and video applications |
| Input voltage noise | 8.2 nV/√Hz - preserves signal integrity in low-amplitude, wideband signal paths |
| Output current | ±160 mA - drives heavy loads including 75-Ω video lines and active filter stages |
| Gain flatness | 0.1 dB to 28 MHz - maintains amplitude accuracy across multi-MHz baseband bandwidths |
| Supply voltage | ±5 V (±3.5 V min, ±6.5 V abs max) - compatible with standard dual-rail analog power domains |
Pinout & Package
Package: SOIC-14 (8.65 mm × 3.91 mm), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +VCC (Pins 1, 14) | Positive supply rail | Dual-supply operation requires connection to +5 V; pins are internally tied for robust current delivery |
| –VCC (Pins 7, 8) | Negative supply rail | Must be connected to –5 V; dual-pin layout reduces ground bounce in high-speed switching |
| +VIN (Pin 3) | Noninverting input | Differential input node; high-impedance (0.5 MΩ || 1 pF) for minimal loading of source |
| –VIN (Pin 6) | Inverting input | Complements +VIN; enables true differential signal acquisition and common-mode rejection (65 dB) |
| +RG / –RG (Pins 4, 5) | Gain set resistor terminals | External RG defines AVMAX; precision resistor matching ensures gain accuracy within ±0.3 dB |
| FB (Pin 12) | Feedback resistor input | Connects to RF to close loop; sets closed-loop gain and bandwidth per AVMAX = 2×(RF/RG) |
| VG (Pin 2) | Gain control voltage | Analog control input (–1 V to +1 V); linear V/V response enables predictable gain scaling |
| VOUT (Pin 10) | Amplified output | Single-ended output capable of ±3.9 V swing into 100 Ω; low 0.01 Ω output impedance |
| GND (Pin 11) | Analog ground reference | Primary ground return for input/output circuitry; must be low-inductance path to minimize noise coupling |
| VREF (Pin 9) | Output voltage reference | Provides bias point for level-shifting output; used in AC-coupled or single-supply configurations |
Key Features
| Feature | Design Value |
|---|---|
| DC-coupled architecture | Enables accurate amplification of baseband and low-frequency signals without blocking capacitors |
| Linear-in-V/V gain law | Eliminates need for logarithmic DACs or lookup tables; simplifies control interface design |
| Integrated current-feedback output stage | Delivers high output current and fast settling (11 ns to 0.01%) without external drivers |
| High CMRR (65 dB) | Rejects common-mode interference in noisy industrial or video environments |
| Low quiescent current (34–38 mA) | Reduces thermal load and power supply requirements in multi-channel systems |
Applications
| Differential Line Receivers | Differential Equalizers |
|---|---|
Use Scenario: Receiving balanced analog video or data signals over twisted-pair cables with length-induced loss and skew. IC Role / Device Role / Timing Role: Differential-to-single-ended conversion with programmable gain to compensate for channel insertion loss. Use Value: Restores signal amplitude while preserving timing integrity; 28-MHz 0.1-dB flatness ensures minimal group delay distortion across SD/HD video bandwidths. | Use Scenario: Compensating frequency-dependent attenuation in RC-dominated transmission lines (e.g., coaxial video links). IC Role / Device Role / Timing Role: Active equalizer with adjustable peaking response controlled by VG voltage. Use Value: Enables real-time tuning of equalization depth and bandwidth; 150-MHz bandwidth supports equalization up to 1080p60 video rates. |
| Pulse Amplitude Compensation | Drop-In Upgrade to LMH6503 |
Use Scenario: Stabilizing pulse height in time-of-flight sensors, laser drivers, or radar front-ends where signal amplitude varies with distance or temperature. IC Role / Device Role / Timing Role: Closed-loop gain adjustment based on feedback from peak detector or ADC. Use Value: Maintains constant pulse amplitude despite varying input levels; 40-dB range accommodates >100:1 dynamic input swings. | Use Scenario: Replacing legacy LMH6503 in existing designs requiring higher bandwidth or improved gain linearity. IC Role / Device Role / Timing Role: Pin-compatible VGA upgrade offering 150 MHz vs. LMH6503's 100 MHz and ±0.3 dB vs. ±0.5 dB gain deviation. Use Value: Extends system bandwidth and improves measurement accuracy without PCB redesign or firmware changes. |
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 420-MHz bandwidth but narrower 40-dB gain range; 7.0 nV/√Hz input noise vs. 8.2 nV/√Hz | Better suited for RF IF gain control above 100 MHz; less optimal for baseband video due to higher noise floor | Select VCA821IDR only when bandwidth >300 MHz is required and gain linearity at low frequencies is secondary |
| VCA824IDR | Same 420-MHz bandwidth as VCA821; lower 7.0 nV/√Hz noise; identical pinout and control interface | Direct functional replacement for VCA821; not drop-in for VCA822 due to different gain-setting resistor ratios | Choose VCA824IDR when upgrading from VCA821 and needing improved noise performance without layout change |
Compared with VCA822IDRG4, VCA821IDR trades baseband gain accuracy and video-optimized flatness for raw RF bandwidth, while VCA824IDR offers superior noise and bandwidth but requires revalidation of RG/RF network values for equivalent gain settings.
Availability
VCA822IDRG4 is available at Aetrix Electronics and suitable for differential line receivers, video equalizers, pulse amplitude compensation circuits, and voltage-tunable active filters requiring stable component supply and long-term industrial availability.
Supply support for VCA822IDRG4 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-speed amplifiers and signal chain solutions.
The VCA822IDRG4 belongs to TI's wideband variable gain amplifier product line, designed specifically for high-fidelity analog signal conditioning in video, test equipment, and communications infrastructure where precise, linear gain control and wide bandwidth are critical.
FAQ
What is the maximum gain range supported by the VCA822IDRG4?
The VCA822IDRG4 supports a gain adjust range exceeding 40 dB, achieved by varying the gain control voltage (VG) from –1 V to +1 V. At AVMAX = +10 V/V, it delivers +10 V/V at VG = +1 V and approximately 0.1 V/V (–20 dB) at VG = –1 V, with confirmed –24 dB attenuation relative to maximum gain at VG = –0.9 V per datasheet characterization.
Does the VCA822IDRG4 require external input or output buffering?
No, the VCA822IDRG4 does not require external buffering. Its internal architecture integrates two high-impedance input buffers and a current-feedback output stage, forming a complete variable gain amplifier system. This eliminates added propagation delay, noise, and board space associated with discrete buffer stages.
What is the recommended supply configuration for the VCA822IDRG4?
The VCA822IDRG4 is specified for operation with ±5-V dual supplies, with absolute maximum ratings of ±6.5 V. It functions reliably from ±3.5 V minimum, making it compatible with standard analog rails. Decoupling capacitors (e.g., 0.1 µF ceramic + 10 µF tantalum per supply) are required at the +VCC and –VCC pins to ensure stability at high frequencies.
How does the VCA822IDRG4 achieve 0.1-dB gain flatness to 28 MHz?
The VCA822IDRG4 achieves 0.1-dB gain flatness to 28 MHz through optimized internal current-feedback amplifier topology and careful compensation of parasitic capacitances. This specification is verified at AVMAX = +10 V/V, VO = 1 VPP, and VG = +1 V under 25°C conditions, ensuring consistent amplitude response across baseband video and instrumentation bandwidths.
Can the VCA822IDRG4 drive a 75-Ω video load directly?
Yes, the VCA822IDRG4 can drive a 75-Ω video load directly. Its ±160 mA output current capability and ±3.7 V output swing into 100 Ω (derated to ~±2.8 V into 75 Ω) meet SMPTE standards for analog video distribution. For optimal differential gain/phase (dG/dP) performance, use the recommended RS series resistor per capacitive load curves in the datasheet.
VCA822IDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
VCA822IDRG4 FAQ
1.How can I place an order for VCA822IDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for VCA822IDRG4 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 VCA822IDRG4 reliable?
The price and inventory of VCA822IDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VCA822IDRG4 is usually 5 days.
3.What payment methods are accepted for VCA822IDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VCA822IDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VCA822IDRG4?
VCA822IDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VCA822IDRG4 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 VCA822IDRG4?
For technical support, including VCA822IDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VCA822IDRG4 requirements.
6.How does Aetrix verify that VCA822IDRG4 is sourced from the original manufacturer or authorized distributors?
All VCA822IDRG4 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 VCA822IDRG4 meets industry standards.
7.What is the process for return or replacement of VCA822IDRG4?
All VCA822IDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with VCA822IDRG4, 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 VCA822IDRG4 part is unused and in its original packaging.
Return procedure for VCA822IDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
VCA822IDRG4 Tags
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LM358DT
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LM358DR
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