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Analog Devices Inc. LTC6412IUF#TRPBF
- Part No.:
- LTC6412IUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC6412IUF#TRPBF.pdf
- Description:
- IC VARIABLE GAIN 1 CIRCUIT 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,085
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Product details
Overview
LTC6412IUF#TRPBF from Analog Devices (acquired Linear Technology) is a fully differential, linear-in-dB analog-controlled variable gain amplifier (VGA) designed for AC-coupled IF receiver chains from 1MHz to 500MHz. It delivers –14dB to +17dB gain range, 800MHz –3dB small-signal bandwidth, and flat 35dBm OIP3 across all gains at 240MHz - enabling high-dynamic-range signal conditioning in cellular basestation transceivers and WiMAX receivers.
For engineers reviewing the LTC6412IUF#TRPBF datasheet, LTC6412IUF#TRPBF pinout, LTC6412IUF#TRPBF application, or LTC6412IUF#TRPBF equivalent, key selection criteria include its differential 50Ω input impedance, 2.7nV/√Hz input-referred noise, fast 25ns overdrive recovery, EN/SHDN control interface, and guaranteed –40°C to +85°C operation in the 4mm × 4mm QFN package.
Technical Context
The LTC6412IUF#TRPBF uses an interpolated tapped attenuator architecture followed by a buffered output stage, ensuring monotonic, continuous linear-in-dB gain control with ±0.1dB ripple and <0.5μs response time. Its internal biasing maintains constant 50Ω differential input impedance and stable common-mode voltage across the full gain range.
Gain is controlled via dual VG pins (±VG) supporting both positive-slope (+32dB/V) and negative-slope (–32dB/V) modes, referenced to VREF. The device features fully differential inputs/outputs, integrated DC bias generation, and independent EN (output enable) and SHDN (full shutdown) pins for precise power management in multi-stage IF chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Range | –14dB to +17dB (31dB linear-in-dB range; enables precise AGC without digital step artifacts) |
| Small-Signal Bandwidth | 800MHz at max gain (supports wideband IF signals up to 500MHz with minimal roll-off) |
| OIP3 | 35dBm at 240MHz across all gains (ensures consistent third-order linearity regardless of gain setting) |
| Noise Figure | 10dB at maximum gain (combined with 2.7nV/√Hz input noise yields uniform SFDR >120dB) |
| Supply Voltage | 3.0V to 3.6V single supply (compatible with standard 3.3V systems; PSRR >40dB) |
| Supply Current | 110mA typical (reduces to <1mA in SHDN mode for low-power sleep states) |
| Operating Temp | –40°C to +85°C (industrial-grade rating; validated across full range for base station reliability) |
Pinout & Package
Package: 24-lead (4mm × 4mm × 0.75mm) plastic QFN with exposed pad (Pin 25 = GND). Requires soldering exposed pad to PCB ground plane for thermal and RF performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 12, 15, 18, 20, 23) | Ground reference | All internally connected; must be tied to low-inductance PCB ground plane for RF stability and noise suppression |
| +IN / –IN (Pins 2, 3) | Differential signal input | 50Ω differential impedance; internally biased; require 10nF DC-blocking capacitors |
| VCM (Pins 4, 5) | Input common-mode reference | Virtual ground for differential inputs; bypass with 10nF to GND for residual CM rejection |
| VCC (Pins 6, 13, 19, 24) | Positive supply | Four dedicated supply pins; each requires local 1000pF + 0.1μF decoupling |
| +VG / –VG (Pins 9, 11) | Analog gain control inputs | Support ±32dB/V slope modes; internally pulled to GND (10kΩ); low-input-current interface |
| VREF (Pin 10) | Internal bias reference | Midpoint voltage for gain-vs-VG curve; not for external use; bypass with 0.1μF |
| DECL1 / DECL2 (Pins 7, 14) | Internal noise decoupling | Require 0.1μF and 1000pF bypass respectively to suppress internal switching noise |
| +OUT / –OUT (Pins 17, 16) | Differential signal output | Open-collector outputs; require center-tapped transformer or choke to VCC for DC bias return |
| EN (Pin 21) | Output enable | Active-low; disables output signal in 25ns while preserving bias; internally pulled high to VCC (100kΩ) |
| SHDN (Pin 22) | Full shutdown | Active-low; reduces total supply current to <1mA; internally pulled high to VCC (100kΩ) |
Key Features
| Feature | Design Value |
|---|---|
| Constant OIP3 across gain range | 35dBm at 240MHz regardless of gain setting - eliminates intermodulation distortion variation in AGC loops |
| Flat noise figure vs. gain | NF = 10dB at GMAX, rising to 42dB at GMIN - maintains uniform SFDR >120dB over full 31dB range |
| Fast overdrive recovery | 25ns recovery at 70MHz - prevents signal blanking during burst-mode or pulsed IF operation |
| Dual control modes | Configurable ±32dB/V gain slope via ±VG/VREF connection - supports both increasing- and decreasing-gain control architectures |
| Robust input handling | +15dBm continuous RF input (50Ω) - withstands strong interferers without damage or latch-up |
Applications
| 2.5G/3G Cellular Basestation Transceiver | WiMAX/WiBro IF Receiver |
|---|---|
Use Scenario: Downconverted IF signal conditioning prior to ADC sampling in macrocell BTS radios. IC Role / Device Role / Timing Role: Differential VGA placed between LT5527 mixer and LTC6400 ADC driver to maintain SNR and SFDR across varying channel conditions. Use Value: 31dB analog AGC range and flat OIP3 ensure consistent dynamic range for multi-carrier WCDMA signals without digital gain correction latency. |
Use Scenario: IF amplification in fixed wireless access receivers operating at 2.3–2.7GHz bands with 10MHz channel spacing. IC Role / Device Role / Timing Role: Front-end VGA in cascaded IF chain with LTC6410-6 and LTC2208 ADC to optimize system NF and IP3 budget. Use Value: 800MHz bandwidth and 2.7nV/√Hz input noise preserve EVM under high-order QAM modulation at 240MHz IF. |
| Satellite/GPS L-band IF Stage | High-Speed Data Acquisition System |
Use Scenario: Low-noise amplification of 1575.42MHz GPS L1 IF (after downconversion to ~140MHz) in precision timing receivers. IC Role / Device Role / Timing Role: Gain-controlled buffer between downconverter and 16-bit ADC (e.g., LTC2208), maintaining phase coherence and minimizing AM sidebands. Use Value: <20nV/√Hz control-input referred noise prevents degradation of carrier-to-noise ratio (C/N₀) in narrowband GPS tracking loops. |
Use Scenario: Programmable gain front-end for oscilloscope or spectrum analyzer digitizers requiring >100dB spurious-free dynamic range. IC Role / Device Role / Timing Role: Differential VGA driving LTC6416 ADC driver to match 50Ω source and 200Ω load impedances across gain settings. Use Value: 50Ω input impedance remains invariant with gain, eliminating mismatch-induced frequency response ripple in calibrated measurement systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-controlled VGA applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADL5330ACPZ-R7 | 50Ω single-ended input; 0.5–2.5GHz range; 20dB gain range; requires external balun for differential interface | Better suited for direct RF gain control above 500MHz; lacks differential input/50Ω match at IF frequencies | Select when operating >500MHz or when single-ended architecture simplifies layout |
| LMH6401IRSNR | Differential input/output; 0.01–3.2GHz bandwidth; digital SPI gain control; 24dB range; higher 135mA supply current | Offers programmable gain steps and built-in RSSI detection; no analog VG interface | Select when digital control, wider bandwidth, or integrated monitoring is required over analog linearity |
Compared with ADL5330ACPZ-R7 and LMH6401IRSNR, the LTC6412IUF#TRPBF uniquely combines true differential 50Ω input matching, flat OIP3 across 31dB gain, and sub-30ns overdrive recovery - making it optimal for high-fidelity, low-latency IF AGC where analog control precision and RF robustness are critical.
Availability
LTC6412IUF#TRPBF is available at Aetrix Electronics and suitable for 2.5G/3G cellular basestation transceivers, WiMAX/WiBro IF receivers, and satellite/GPS L-band IF stages requiring stable component supply, industrial temperature compliance, and long-term obsolescence mitigation.
Supply support for LTC6412IUF#TRPBF 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC6412IUF#TRPBF belongs to ADI's high-speed differential amplifier product line, engineered specifically for demanding IF signal chain applications in wireless infrastructure, test equipment, and precision data acquisition where linearity, noise, and gain control fidelity are paramount.
FAQ
What is the guaranteed operating temperature range for the LTC6412IUF#TRPBF?
The LTC6412IUF#TRPBF is specified and guaranteed over the industrial temperature range of –40°C to +85°C. This rating applies to all electrical parameters in the datasheet, including gain accuracy, OIP3, noise figure, and transient response - unlike the commercial-grade C-temperature variant which is only tested from 0°C to 70°C.
Does the LTC6412IUF#TRPBF require external DC biasing on its input pins?
No, the LTC6412IUF#TRPBF provides internally generated DC bias on +IN and –IN pins. Users must place 10nF DC-blocking capacitors in series with the input signal path to isolate external DC sources, but no external bias network is needed - simplifying design and improving repeatability across boards.
How does the LTC6412IUF#TRPBF maintain constant OIP3 across its gain range?
The LTC6412IUF#TRPBF achieves constant OIP3 through its interpolated tapped attenuator architecture, which adjusts signal level before the fixed-gain output stage. This preserves output-stage compression characteristics and ensures 35dBm OIP3 remains stable from –14dB to +17dB gain - critical for predictable intermodulation performance in multi-channel receivers.
Can the LTC6412IUF#TRPBF drive a 50Ω differential load directly?
No - the LTC6412IUF#TRPBF outputs are open-collector and require external DC return paths. To interface with a 50Ω differential load (e.g., ADC driver input), a center-tapped transformer or choke inductor must connect +OUT and –OUT to VCC, establishing the proper DC bias while presenting 200Ω differential load impedance per the datasheet test condition.
What is the purpose of the DECL1 and DECL2 pins on the LTC6412IUF#TRPBF?
DECL1 (Pin 7) and DECL2 (Pin 14) are dedicated internal noise decoupling terminals. DECL1 requires a 0.1μF capacitor to ground, while DECL2 requires a 1000pF capacitor. These pins shunt high-frequency noise generated within the gain control and bias circuitry, preventing coupling into the signal path and maintaining specified HD2/HD3 performance.
LTC6412IUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Amplifier Type:
- Variable Gain
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 800 MHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 110mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 3.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC6412IUF#TRPBF FAQ
1.How can I place an order for LTC6412IUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6412IUF#TRPBF 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 LTC6412IUF#TRPBF reliable?
The price and inventory of LTC6412IUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6412IUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6412IUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6412IUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6412IUF#TRPBF?
LTC6412IUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6412IUF#TRPBF 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 LTC6412IUF#TRPBF?
For technical support, including LTC6412IUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6412IUF#TRPBF requirements.
6.How does Aetrix verify that LTC6412IUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6412IUF#TRPBF 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 LTC6412IUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6412IUF#TRPBF?
All LTC6412IUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6412IUF#TRPBF, 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 LTC6412IUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC6412IUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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