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Analog Devices Inc./Maxim Integrated MAX9679BETG+
- Part No.:
- MAX9679BETG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Video Processing
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX9679BETG+.pdf
- Description:
- IC PROGR REFERENCE OLTAGE 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,359
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Product details
Overview
MAX9679BETG+ from Maxim Integrated is a 12-channel, 10-bit programmable gamma and VCOM reference voltage IC for TFT LCD panel biasing. It integrates 12 gamma DACs (GMA1–GMA12), one VCOM DAC, a programmable 20V full-scale reference (VPREF), high-current output buffers, and multiple-time programmable (MTP) memory - all in a single 24-pin TQFN-EP package. It enables real-time gamma/VCOM bank switching via BKSEL for dynamic display calibration in automotive instrument clusters and industrial HMI displays.
For engineers reviewing the MAX9679BETG+ datasheet, MAX9679BETG+ pinout, MAX9679BETG+ application, or MAX9679BETG+ equivalent, key selection criteria include its dual-bank volatile register architecture, ±0.1% VPREF accuracy, 200mA gamma output transient capability, 600mA VCOM sourcing/sinking, and I²C Fast-Mode Plus (1MHz) interface with BKSEL hardware control for sub-400ns bank switching.
Technical Context
The MAX9679BETG+ implements two independent 12-channel gamma banks and dual VCOM codes stored in volatile registers, selected by the BKSEL logic input. Its programmable 10-bit VPREF sets full-scale DAC output (VGMA = VPREF × CODE/1024, VVCOM = VPREF × CODE/1024), with VPREF itself accurate to ±0.1% and stable over temperature (±50μV/°C drift).
Gamma outputs are split across two analog supplies: GMA1–GMA6 powered from AVDD1 (9–20V), GMA7–GMA12 from AVDD2 (6–20V); VCOM amplifier operates from AVDD_AMP (9–20V). Each gamma buffer delivers up to 200mA peak transient current, while VCOM sustains ±600mA continuous output with internal current limiting and thermal shutdown at +165°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gamma channels | 12 independent 10-bit DAC outputs (GMA1–GMA12) with high-current buffers |
| VCOM output | 1 programmable 10-bit DAC with 600mA sourcing/sinking capability and feedback pin (VCOM_FB) |
| Programmable reference | 10-bit VPREF with ±0.1% full-scale accuracy (19.96–20.00V) and <50μV/°C tempco |
| Bank switching | Hardware-controlled BKSEL selects between two complete gamma/VCOM code sets in <400ns |
| I²C interface | Fast-Mode Plus compliant (1MHz max), supports A0 address bit for multi-device bus |
| Memory | Multiple-time programmable (MTP) nonvolatile memory stores gamma/VCOM/VPREF codes (100 write cycles) |
| Supply ranges | AVDD1/AVDD2/AVDD_AMP: 6–20V; DVDD: 2.7–3.6V; all support independent rail optimization |
Pinout & Package
MAX9679BETG+ is housed in a 24-pin, 4mm × 4mm, 0.5mm pitch TQFN-EP package with exposed pad (EP) internally connected to AGND. Thermal resistance is θJA = 39°C/W (4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 24 | AGND / VCOM_FB | Analog ground reference; VCOM_FB is negative input of VCOM op-amp for closed-loop stability |
| 2 | DVDD | Digital supply (2.7–3.6V); powers I²C interface and logic - bypass with 0.1μF to AGND |
| 3, 4 | SCL, SDA | I²C clock/data lines (1MHz Fast-Mode Plus); open-drain, require pull-ups to DVDD |
| 5 | BKSEL | Logic-level bank select input (0 = Bank 1, 1 = Bank 2); enables real-time gamma/VCOM switching |
| 6 | A0 | I²C device address LSB; sets slave address as 0x48 or 0x49 for multi-IC configurations |
| 8, 21, 22 | AVDD1, AVDD2, AVDD_AMP | Independent analog rails: AVDD1 powers GMA1–GMA6; AVDD2 powers GMA7–GMA12; AVDD_AMP powers VCOM amplifier |
| 9–20 | GMA1–GMA12 | 12 gamma DAC analog outputs; each capable of ±200mA transient current and low-output-impedance buffering |
| 23 | VCOM | VCOM DAC output; drives TFT-LCD backplane directly with ±600mA capability and internal current limit |
Key Features
| Feature | Design Value |
|---|---|
| Dual gamma/VCOM bank storage | Two complete sets of 12 gamma codes + VCOM1/VCOM2 stored in volatile memory; selected instantly via BKSEL |
| Integrated programmable reference | On-chip 10-bit VPREF eliminates external reference IC and improves system accuracy and layout simplicity |
| MTP nonvolatile memory | Stores gamma, VCOM, and VPREF codes permanently (100-program lifetime); auto-loads on power-up |
| Thermal protection | Automatic shutdown at +165°C with 15°C hysteresis prevents damage during sustained high-power operation |
| Rail-flexible analog supplies | Separate AVDD1/AVDD2/AVDD_AMP allow optimized voltage assignment per output bank to reduce heat and improve PSRR |
Applications
| Automotive Instrument Clusters | Industrial HMI Displays |
|---|---|
Use Scenario: High-brightness TFT LCDs in vehicle dashboards requiring consistent gamma response across wide temperature (-40°C to +85°C) and varying supply conditions. IC Role / Device Role / Timing Role: MAX9679BETG+ generates precise, temperature-stable gamma voltages and VCOM bias for source driver ICs; BKSEL enables dynamic recalibration during startup or mode change. Use Value: Dual-bank storage allows pre-calibrated day/night gamma curves; ±0.1% VPREF accuracy ensures <40mV total gamma error over temperature. | Use Scenario: Ruggedized touchscreens in factory HMIs where display contrast must remain stable despite EMI, voltage ripple, and thermal cycling. IC Role / Device Role / Timing Role: MAX9679BETG+ serves as centralized gamma/VCOM reference with high PSRR (>60dB up to 100kHz) and fast load transient recovery (<2µs for 100mA step). Use Value: Independent AVDD1/AVDD2 rails isolate gamma banks from supply noise; 600mA VCOM drive eliminates need for external amplification. |
| Medical Diagnostic Monitors | Avionics Display Systems |
Use Scenario: High-resolution grayscale medical imaging panels demanding pixel-level luminance consistency and DICOM calibration compliance. IC Role / Device Role / Timing Role: MAX9679BETG+ provides 12 precisely matched gamma references with <1LSB INL/DNL, enabling linear 10-bit grayscale mapping. Use Value: MTP memory retains factory calibration data across power cycles; dual-bank support allows clinical vs. service mode gamma profiles. | Use Scenario: MIL-STD-810-certified cockpit displays operating under extreme vibration, rapid thermal transients, and wide input voltage swings. IC Role / Device Role / Timing Role: MAX9679BETG+ acts as fault-tolerant gamma/VCOM source with thermal shutdown, rail-independent operation, and robust I²C communication. Use Value: 200mA gamma transient capability maintains voltage stability during fast polarity switching; exposed-pad TQFN enhances thermal reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gamma/VCOM reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX9679AETG+ | Predecessor version with identical pinout and function but lower VPREF accuracy (±0.2% vs. ±0.1%) and no thermal shutdown hysteresis spec | Suitable for cost-sensitive consumer panels where tighter VPREF tolerance is not required | Select MAX9679BETG+ when guaranteed ±0.1% reference stability and thermal hysteresis control are mandatory |
| TI SN74AVC16T245 | Level-shifting transceiver - not a gamma/VCOM IC; lacks DACs, MTP, VPREF, or analog output capability | Only applicable as I²C signal conditioner, not as functional replacement | Not a functional alternative; use only for interface signal integrity, not for gamma/VCOM generation |
Compared with MAX9679AETG+, the MAX9679BETG+ delivers tighter VPREF accuracy and defined thermal hysteresis, enabling higher display fidelity in automotive and medical systems; TI SN74AVC16T245 serves a completely different signal-integrity role and cannot replace gamma/VCOM functionality.
Availability
MAX9679BETG+ is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMI displays, medical diagnostic monitors, and avionics display systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX9679BETG+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX9679BETG+ belongs to Maxim's display bias IC product line, engineered specifically to consolidate gamma correction, VCOM generation, and reference voltage functions into a single chip for TFT-LCD timing controller (TCON) interfaces.
FAQ
What is the full-scale voltage range of the programmable reference (VPREF) in MAX9679BETG+?
The MAX9679BETG+ features a programmable 10-bit reference voltage (VPREF) with a full-scale output of 20V ±0.1% (19.96V to 20.00V at +25°C). VPREF is calculated as (20V × CODE)/1024, where CODE is the 10-bit register value (0–1023), yielding a maximum VPREF of 19.98V when CODE = 1023. This reference sets the full-scale range for all 12 gamma and VCOM DACs in the MAX9679BETG+.
How does the BKSEL pin function in MAX9679BETG+ and what is its switching speed?
The BKSEL pin on the MAX9679BETG+ is a dedicated logic input that selects between two independent sets of gamma and VCOM codes stored in volatile memory. When BKSEL = LOW, Bank 1 (GMA1BK1–GMA12BK1, VCOM1) is active; when BKSEL = HIGH, Bank 2 (GMA1BK2–GMA12BK2, VCOM2) is active. Gamma bank switching settles in ≤200ns, and VCOM bank switching settles in ≤400ns, enabling real-time display recalibration without I²C intervention in the MAX9679BETG+.
What are the absolute maximum ratings for analog supply voltages in MAX9679BETG+?
The MAX9679BETG+ specifies absolute maximum analog supply voltages of –0.3V to +22V for AVDD1 and AVDD2, and –0.3V to +22V for AVDD_AMP. DVDD digital supply is rated –0.3V to +4V. Exceeding these limits may cause permanent damage. Recommended operating ranges are AVDD1/AVDD2/AVDD_AMP = 6–20V and DVDD = 2.7–3.6V. These ratings ensure safe operation in high-voltage LCD panel environments where AVDD1 often reaches 18V in the MAX9679BETG+.
Does MAX9679BETG+ include nonvolatile memory, and how many times can it be programmed?
Yes, the MAX9679BETG+ includes multiple-time programmable (MTP) nonvolatile memory that retains gamma, VCOM, and VPREF codes even when unpowered. The MTP memory supports up to 100 program/erase cycles and automatically loads stored values into volatile I²C registers during power-on reset (POR). This eliminates the need for external EEPROM and ensures reliable factory calibration persistence across power cycles in the MAX9679BETG+.
What thermal protection features does MAX9679BETG+ provide?
The MAX9679BETG+ incorporates thermal shutdown protection that disables all gamma and VCOM outputs when the junction temperature reaches +165°C. Outputs re-enable automatically after the die cools by 15°C (hysteresis), ensuring safe recovery without manual reset. This feature protects the IC and connected LCD panel during sustained high-current operation or poor heatsinking - a critical safeguard in enclosed automotive and industrial enclosures where the MAX9679BETG+ is deployed.
MAX9679BETG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Gamma Reference
- Applications:
- Video Display
- Standards:
- -
- Control Interface:
- I2C
- Voltage - Supply:
- 2.7V ~ 3.6V
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 24-TQFN (4x4)
MAX9679BETG+ FAQ
1.How can I place an order for MAX9679BETG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX9679BETG+ 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 MAX9679BETG+ reliable?
The price and inventory of MAX9679BETG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX9679BETG+ is usually 5 days.
3.What payment methods are accepted for MAX9679BETG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX9679BETG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX9679BETG+?
MAX9679BETG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX9679BETG+ 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 MAX9679BETG+?
For technical support, including MAX9679BETG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX9679BETG+ requirements.
6.How does Aetrix verify that MAX9679BETG+ is sourced from the original manufacturer or authorized distributors?
All MAX9679BETG+ 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 MAX9679BETG+ meets industry standards.
7.What is the process for return or replacement of MAX9679BETG+?
All MAX9679BETG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX9679BETG+, 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 MAX9679BETG+ part is unused and in its original packaging.
Return procedure for MAX9679BETG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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