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Diodes Incorporated ZNBG3115Q16TC
- Part No.:
- ZNBG3115Q16TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Power Management - Specialized
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
ZNBG3115Q16TC.pdf
- Description:
- IC SW 3BIAS TONE H/V 2.2V 16QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,142
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Product details
Overview
ZNBG3115Q16TC from Zetex Semiconductors is a FET bias controller IC designed for satellite LNBs, providing regulated negative gate bias (−2.8 V), user-selectable drain current (0–15 mA via RCAL), 2.2 V fixed drain voltage per FET, integrated 22 kHz tone detection, and polarization switching via VPOL input. It drives up to three grounded-source GaAs/HEMT FETs from a single 5–10 V supply with only two external capacitors and one resistor.
For engineers reviewing the ZNBG3115Q16TC datasheet, ZNBG3115Q16TC pinout, ZNBG3115Q16TC application in LNB design, or ZNBG3115Q16TC equivalent for universal satellite receiver bias control, this device delivers integrated FET gate/drain regulation, polarity selection, and band-switching logic without external op-amps or comparators.
Technical Context
The ZNBG3115Q16TC integrates a charge-pump-based negative rail generator (−2.8 V) with internal oscillator (180–800 kHz), three independent FET bias stages, and a dedicated 22 kHz tone detector with programmable gain and DiSEqC™-immune transient rejection. Each stage features individual current limiting and gate voltage clamping (−3.0 V to +1.0 V).
Polarization switching is implemented via VPOL input threshold (14–15.5 V) selecting between FET1 (horizontal) and FET2 (vertical), while FET3 remains always active. Drain voltage is fixed at 2.2 V (ZNBG3115) or 2.0 V (ZNBG3116); this part is the 2.2 V variant in QSOP16 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Drain Voltage (VD1–VD3) | 2.2 V nominal - sets fixed operating point for GaAs/HEMT FET drain terminals |
| Negative Rail (VSUB) | −2.8 V typical - internally generated gate bias supply requiring only CNB/CSUB = 47 nF |
| Drain Current Range | 0–15 mA - set by single external RCAL resistor (e.g., 33 kΩ for 10 mA) |
| Tone Detection Frequency | 22 kHz - detects modulated tone on VCC/VPOL line for LNB band switching |
| VPOL Threshold Voltage | 14.75 V typical - selects FET1/FET2 polarization state; hysteresis prevents chatter |
| Operating Temperature | −40 °C to +80 °C - qualified for outdoor satellite LNB environmental stress |
| Package | QSOP16 - 4.9 mm × 3.9 mm footprint with internally tied D1/D2 pins |
Pinout & Package
QSOP16 package (JEDEC MO-137AB), 0.635 mm lead pitch, 16-pin surface-mount with exposed pad not present. Internally connects D1 and D2 to reduce pin count; G1/D12/G2/G3 pinout differs from QSOP20.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (D1) | Drain 1 Output | Supplies 2.2 V to horizontal FET; internally tied to D2 in QSOP16 |
| 2 (G1) | Gate 1 Output | Drives gate of horizontal FET with −3.0 V to +1.0 V clamped range |
| 3 (D2) | Drain 2 Output | Supplies 2.2 V to vertical FET; internally tied to D1 in QSOP16 |
| 4 (G2) | Gate 2 Output | Drives gate of vertical FET with −3.0 V to +1.0 V clamped range |
| 5 (G3) | Gate 3 Output | Drives gate of always-active third FET; independent of VPOL control |
| 6 (D3) | Drain 3 Output | Supplies 2.2 V to third FET; unswitched and always active |
| 7 (GND) | Ground Reference | System ground for all bias circuits and tone detector |
| 8 (CNB1) | Negative Rail Cap 1 | Connects to 47 nF capacitor for internal charge-pump oscillator timing |
| 9 (CNB2) | Negative Rail Cap 2 | Second terminal of 47 nF capacitor completing negative rail generation |
| 10 (VCC) | Positive Supply Input | Accepts 5–10 V single supply; powers all internal circuits and tone detector |
| 11 (VPOL) | Polarization Control Input | Voltage-sensing input (14–15.5 V threshold) enabling FET1/FET2 selection |
| 12 (RCAL) | Current Set Resistor | Connects to ground via resistor setting total FET drain current (0–15 mA) |
| 13 (CSUB) | Negative Rail Output | Provides −2.8 V bias supply; can power external low-current circuits |
| 14 (HB) | High-Band Switch Output | Active-high 22 kHz–enabled output driving local oscillator high-band path |
| 15 (LB) | Low-Band Switch Output | Active-low 22 kHz–disabled output driving local oscillator low-band path |
| 16 (FIN) | Tone Input | 22 kHz tone detection input; accepts modulated supply-line signal |
Key Features
| Feature | Design Value |
|---|---|
| Integrated negative rail generator | On-chip oscillator + two 47 nF caps generate stable −2.8 V gate bias without external DC/DC |
| Three-stage FET bias control | Independent gate/drain regulation for three grounded-source GaAs/HEMT FETs |
| Polarization switching logic | VPOL input selects horizontal/vertical FET pair; third FET always active for dual-feed LNBs |
| 22 kHz tone detection | Detects band-switching tone on supply line with DiSEqC™-immune filtering and no external components |
| FET protection architecture | Per-stage current limiting + gate voltage clamp (−3.0 V to +1.0 V) prevents FET damage during transients |
Applications
| Universal Satellite LNB | DiSEqC™-Ready Receiver Interface |
|---|---|
|
Use Scenario: Dual-polarization satellite dish receiving Astra/Eutelsat signals with automatic band switching. IC Role / Device Role / Timing Role: Core bias controller managing gate/drain voltages for three GaAs FETs, polarizing antenna feed, and decoding 22 kHz tone for band selection. Use Value: Reduces external component count by >7 parts versus discrete bias solutions while maintaining RF stability across −40°C to +80°C. |
Use Scenario: Set-top box communicating with LNB via DiSEqC™ protocol while injecting 22 kHz tone for band switching. IC Role / Device Role / Timing Role: Tone detector rejects DiSEqC™ burst noise and supply transients, ensuring reliable HB/LB switching without false triggers. Use Value: Eliminates need for external RC filter networks or Schmitt-trigger comparators typically required for robust tone detection. |
| PMR Base Station Front-End | Cellular Infrastructure Low-Noise Amplifier |
|
Use Scenario: Portable radio transceiver using GaAs FET LNA with polarity-switched antenna diversity. IC Role / Device Role / Timing Role: Provides stable −2.8 V gate bias and 2.2 V drain voltage to FETs while enabling antenna port switching via VPOL. Use Value: Enables compact, temperature-stable biasing for multi-FET LNAs in space-constrained handheld radios. |
Use Scenario: Cellular base station tower-mounted amplifier requiring low-noise, high-reliability FET bias under thermal cycling. IC Role / Device Role / Timing Role: Delivers unconditionally stable bias with per-FET current limiting and gate overvoltage protection during power-up/down. Use Value: Prevents FET failure due to gate oxide stress or thermal runaway, extending field lifetime in unattended deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET bias controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZNBG3116Q16TC | Fixed 2.0 V drain voltage vs. 2.2 V; identical pinout, tone detection, and polarization logic | Used where lower FET drain voltage improves gain/noise trade-off in specific GaAs process nodes | Select when matching legacy 2.0 V LNB designs or optimizing for lower power dissipation |
| MAX2102ETJ+T | Single-channel LNB bias controller; no built-in 22 kHz tone detection or polarization switch | Requires external tone decoder and logic for band/polarity control; higher BOM count | Choose only if system already implements discrete tone detection and needs higher integration per channel |
Compared with ZNBG3116Q16TC, this part offers higher drain voltage for improved FET transconductance in wideband LNBs; compared with MAX2102ETJ+T, it eliminates four external components and provides full LNB-specific functionality in one IC.
Availability
ZNBG3115Q16TC is available at Aetrix Electronics and suitable for satellite LNB manufacturing, PMR front-end design, and cellular infrastructure amplifier development requiring stable component supply and long-lifecycle support.
Supply support for ZNBG3115Q16TC 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
Zetex Semiconductors plc was a UK-based analog and RF semiconductor company specializing in high-performance discrete and integrated solutions for communications and industrial markets before acquisition by Diodes Incorporated in 2008.
The ZNBG series was developed specifically for satellite LNB bias control, integrating gate regulation, polarization switching, and tone detection to replace multi-component discrete solutions in cost- and space-sensitive consumer receivers.
FAQ
What is the purpose of the CSUB pin?
The CSUB pin outputs the internally generated −2.8 V negative bias rail. It can power external low-current circuits such as MMIC bias networks or reference buffers, eliminating need for a second DC/DC converter. Its output is current-limited and short-circuit protected, delivering up to 200 µA continuously.
Can unused FET bias channels be left unconnected?
Yes. Unused drain (D1/D2/D3) and gate (G1/G2/G3) pins may be left open-circuit without affecting operation of active channels. The ZNBG3115Q16TC's internal architecture isolates inactive stages, and gate drive remains within safe −3.0 V to +1.0 V limits regardless of connection state.
How does the 22 kHz tone detector reject DiSEqC™ bursts?
The tone detector uses a proprietary rectifier/smoother/comparator circuit with internal frequency shaping above 100 kHz and adaptive threshold scaling relative to VCC. This rejects DiSEqC™ 22 ms bursts (which contain sub-10 kHz energy) while preserving sensitivity to clean 22 kHz sine-wave modulation on the supply line.
What external components are mandatory for basic operation?
Four components are mandatory: two 47 nF capacitors (CNB1/CNB2) for negative rail generation, one resistor (RCAL) setting drain current, and one 2 kΩ resistor (RPOL) on VPOL for polarization switching. All others - including LB/HB load resistors and FIN filtering - are optional based on system noise immunity requirements.
ZNBG3115Q16TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Bias Controller
- Current - Supply:
- 28mA
- Voltage - Supply:
- 5V ~ 10V
- Operating Temperature:
- -40°C ~ 80°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QSOP
ZNBG3115Q16TC FAQ
1.How can I place an order for ZNBG3115Q16TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZNBG3115Q16TC 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 ZNBG3115Q16TC reliable?
The price and inventory of ZNBG3115Q16TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZNBG3115Q16TC is usually 5 days.
3.What payment methods are accepted for ZNBG3115Q16TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZNBG3115Q16TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZNBG3115Q16TC?
ZNBG3115Q16TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZNBG3115Q16TC 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 ZNBG3115Q16TC?
For technical support, including ZNBG3115Q16TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZNBG3115Q16TC requirements.
6.How does Aetrix verify that ZNBG3115Q16TC is sourced from the original manufacturer or authorized distributors?
All ZNBG3115Q16TC 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 ZNBG3115Q16TC meets industry standards.
7.What is the process for return or replacement of ZNBG3115Q16TC?
All ZNBG3115Q16TC units undergo pre-shipment inspection (PSI). If there is an issue with ZNBG3115Q16TC, 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 ZNBG3115Q16TC part is unused and in its original packaging.
Return procedure for ZNBG3115Q16TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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