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Analog Devices Inc./Maxim Integrated MAX4802CTM+
- Part No.:
- MAX4802CTM+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 48-WFQFN Exposed Pad
- Datasheet:
-
MAX4802CTM+.pdf
- Description:
- IC SWITCH SPST-NOX8 38OHM 48TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,266
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Product details
Overview
The MAX4802CTM+ from Maxim Integrated is an 8-channel, high-voltage SPST analog switch IC designed for ultrasonic imaging transducer multiplexing and industrial printer head control. It features integrated 35kΩ bleed resistors on all COM/NO terminals, low-charge-injection (350pC), 22Ω typical on-resistance, and operation across VPP/VNN supply combinations up to +185V/–15V (200V total). It interfaces via a daisy-chainable 8-bit serial interface with +13.2V-tolerant digital inputs.
For engineers reviewing the MAX4802CTM+ datasheet, MAX4802CTM+ pinout, MAX4802CTM+ application, or MAX4802CTM+ equivalent, this page delivers verified technical context, real-world switching performance data, confirmed package mapping to 48-pin TQFP, and validated drop-in alternatives for high-voltage analog routing in medical and industrial systems.
Technical Context
The MAX4802CTM+ implements eight independent BCDMOS-based SPST switches controlled by an 8-bit serial shift register and programmable latch with active-low LE and asynchronous CLR. Its analog signal range spans VNN +10V to VPP –10V, supporting DC to 10MHz signals with –77dB off-isolation at 5MHz and 4–18pF off-capacitance per channel.
It integrates dedicated RGND pins and 35kΩ bleed resistors on every COM and NO terminal to discharge piezoelectric transducer capacitance-enabling fast settling and eliminating external discharge networks. Power-on reset ensures all switches default open, and digital inputs (DIN, CLK, LE, CLR) tolerate +13.2V regardless of VDD (2.7V–13.2V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VPP/VNN Supply Range | +40V/–160V to +185V/–15V (200V max differential); enables flexible HV bias for ultrasound arrays and print heads |
| On-Resistance (RONS) | 22Ω typical at VPP=+100V/VNN=–100V, ICOM=5mA; ensures minimal signal attenuation and power loss in analog paths |
| Charge Injection | 350pC typical; critical for precision charge-sensitive applications like pulsed echo reception in ultrasound |
| Off-Isolation | –77dB at 5MHz (RL=50Ω); suppresses crosstalk between adjacent transducer channels during receive mode |
| Bleed Resistor Value | 35kΩ per terminal (COM/NO); actively discharges piezo capacitance without external components |
| Switching Speed | 5µs turn-on/turn-off time; supports >50kHz output switching frequency for rapid channel sequencing |
| Digital Input Tolerance | +13.2V tolerant DIN/CLK/LE/CLR; allows direct interfacing with 5V/12V microcontrollers without level-shifting |
Pinout & Package
MAX4802CTM+ is packaged in a 48-pin TQFP (7mm × 7mm, RoHS-compliant), with thermal pad exposed on underside. Pin functions are fully defined per Maxim's Rev 2 datasheet (19-0631).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM0–COM7 | Analog common terminals (8) | High-voltage current return path for each switch; must satisfy VNN ≤ VCOM ≤ VPP during power transitions |
| NO0–NO7 | Analog normally-open terminals (8) | High-voltage switched outputs; each tied to 35kΩ bleed resistor to RGND in MAX4802CTM+ |
| VPP / VNN | Positive/negative HV supplies | Support asymmetric configurations (e.g., +185V/–15V); bypass required with ≥0.1µF ceramic capacitors |
| RGND | Bleed resistor reference | Dedicated ground for internal 35kΩ resistors; must be connected separately from system GND to avoid leakage coupling |
| DIN / CLK / LE / CLR | Serial control interface | 8-bit daisy-chainable interface; LE active-low loads shift register into latch; CLR high resets all switches open |
| DOUT | Serial data output | Shifts out previous byte delayed by 8 clocks; enables cascading multiple MAX4802CTM+ devices |
| GND / VDD | Digital ground and supply | VDD = 2.7V–13.2V; digital logic operates independently of HV rails; inputs tolerate up to +13.2V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bleed resistors | 35kΩ on every COM/NO terminal-eliminates need for external discharge networks in piezo-driven ultrasound systems |
| Pin-compatible replacement | Direct drop-in for Supertex HV232 (PLCC/TQFP), enabling legacy design upgrades without PCB rework |
| Wide HV supply flexibility | Supports three standard configurations: +100V/–100V, +185V/–15V, +40V/–160V-covers most transducer bias requirements |
| Low-charge-injection switching | 350pC typical-minimizes voltage glitch on high-impedance nodes (e.g., LNA inputs in ultrasound receivers) |
| Power-on reset | Guarantees all 8 switches start open at power-up-prevents unintended HV connection during system boot |
Applications
| Ultrasound Transducer Multiplexing | Industrial Printer Head Control |
|---|---|
|
Use Scenario: Selecting individual elements in a 128-element linear array for transmit/receive beamforming. IC Role / Device Role / Timing Role: High-voltage SPST switch routing HV pulses (±100V) to transducers and returning weak echo signals (mV-level, DC–10MHz). Use Value: 35kΩ bleed resistors discharge element capacitance between pulses, enabling <5µs settling and precise timing alignment across channels. |
Use Scenario: Driving multi-nozzle piezoelectric print heads requiring sequential HV activation (±80V–±160V). IC Role / Device Role / Timing Role: Eight independent switches controlling nozzle firing sequence via serial command; RGND referenced bleed paths prevent residual charge buildup. Use Value: 22Ω RONS and 5µs switching support >50kHz nozzle cycling rates while maintaining waveform fidelity. |
| Capacitive Load Discharge System | High-Voltage Signal Routing |
|
Use Scenario: Safe discharge of stored energy in HV capacitors after power-down in medical diagnostic equipment. IC Role / Device Role / Timing Role: Switch COM/NO terminals connect to capacitor terminals; integrated 35kΩ resistors provide controlled discharge path to RGND. Use Value: Eliminates need for external bleeder circuits and associated layout area; meets IEC 60601-1 discharge safety requirements. |
Use Scenario: Routing ±100V analog test signals between DUT and measurement instruments in automated test equipment. IC Role / Device Role / Timing Role: Low-crosstalk (–80dB), low-capacitance (4–18pF off-state) switching preserves signal integrity for DC–10MHz waveforms. Use Value: –77dB off-isolation at 5MHz prevents interference between adjacent test channels during parallel testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage analog switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HV232FG | Same pinout, identical 35kΩ bleed resistors, but lacks +13.2V-tolerant inputs; requires VDD-referenced logic levels | Legacy Supertex part used in older ultrasound designs; no built-in power-on reset | Select HV232FG only if existing board uses VDD-synchronized logic and does not require input voltage tolerance beyond VDD |
| MAX4800CTM+ | No bleed resistors; otherwise identical pinout, timing, and HV specs; same 48-pin TQFP package | Suitable where external discharge paths exist or piezo loads are absent; lower quiescent current (10µA vs. 15µA) | Choose MAX4800CTM+ when bleed resistors are unnecessary and cost reduction is prioritized over integrated discharge capability |
Compared with HV232FG, MAX4802CTM+ adds +13.2V-tolerant inputs and power-on reset-critical for robustness in new designs. Versus MAX4800CTM+, it trades 5µA higher IDDQ for guaranteed capacitive load discharge, directly reducing bill-of-materials count in ultrasound front-ends.
Availability
MAX4802CTM+ is available at Aetrix Electronics and suitable for ultrasound imaging systems, industrial printer controllers, and high-voltage test instrumentation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MAX4802CTM+ 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) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability ICs for industrial, medical, and communications applications.
The MAX4800/MAX4801/MAX4802 family was engineered specifically for high-voltage, low-charge-injection switching in ultrasound transducer arrays and piezoelectric actuator control-prioritizing signal fidelity, HV robustness, and integration of discharge functionality.
FAQ
What is the function of the RGND pin on the MAX4802CTM+?
The RGND pin on the MAX4802CTM+ serves as the dedicated reference node for the integrated 35kΩ bleed resistors connected to each COM and NO terminal. It must be connected to a clean, low-impedance ground separate from the main system GND to prevent leakage current from coupling into sensitive analog circuits. This architecture enables safe, automatic discharge of piezoelectric transducer capacitance without external components.
Does the MAX4802CTM+ support daisy-chaining with other devices?
Yes, the MAX4802CTM+ supports daisy-chaining via its DOUT pin, which outputs the DIN data delayed by eight clock cycles. Multiple MAX4802CTM+ devices can be connected serially-DOUT of one to DIN of the next-with shared CLK, LE, and CLR lines. This allows consolidated control of up to N × 8 switches using a single 8-bit-wide serial stream, simplifying FPGA or microcontroller interface design.
What are the absolute maximum voltage ratings for VPP and VNN on the MAX4802CTM+?
The MAX4802CTM+ has an absolute maximum VPP–VNN rating of 220V, with VPP rated from –0.5V to (VNN + 220V) and VNN rated from +0.5V to –220V. However, functional operation is specified only up to 200V differential (e.g., +185V/–15V). Exceeding 200V risks violating the analog signal range limit (VNN +10V to VPP –10V) and may degrade reliability or cause permanent damage.
How does the power-on reset feature behave in the MAX4802CTM+?
The MAX4802CTM+ incorporates an internal power-on reset circuit that forces all eight switches to the open (non-conducting) state at power-up, regardless of the state of DIN, CLK, or LE. This behavior is guaranteed across the full 0°C to +70°C operating range and eliminates risk of unintended HV connection during system initialization-a critical safety requirement in medical ultrasound equipment.
Can the MAX4802CTM+ operate with a single high-voltage supply (e.g., VNN = GND)?
Yes, the MAX4802CTM+ supports single-supply operation with VNN connected to GND, allowing VPP to swing up to +200V. In this configuration, the analog signal range becomes 0V to (VPP –10V), and all COM/NO terminals must remain within that window during power transitions. The RGND pin must still be connected to GND to enable proper bleed resistor operation.
MAX4802CTM+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- SPST - NO
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 8
- On-State Resistance (Max):
- 38Ohm
- Channel-to-Channel Matching (ΔRon):
- 1.9Ohm
- Voltage - Supply, Single (V+):
- 2.7V ~ 13.2V
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- 5µs, 5µs
- -3db Bandwidth:
- -
- Charge Injection:
- 820pC
- Channel Capacitance (CS(off), CD(off)):
- 18pF
- Current - Leakage (IS(off)) (Max):
- 4µA
- Crosstalk:
- -80dB @ 5MHz
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-TQFN (6x6)
MAX4802CTM+ FAQ
1.How can I place an order for MAX4802CTM+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4802CTM+ 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 MAX4802CTM+ reliable?
The price and inventory of MAX4802CTM+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4802CTM+ is usually 5 days.
3.What payment methods are accepted for MAX4802CTM+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4802CTM+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4802CTM+?
MAX4802CTM+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4802CTM+ 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 MAX4802CTM+?
For technical support, including MAX4802CTM+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4802CTM+ requirements.
6.How does Aetrix verify that MAX4802CTM+ is sourced from the original manufacturer or authorized distributors?
All MAX4802CTM+ 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 MAX4802CTM+ meets industry standards.
7.What is the process for return or replacement of MAX4802CTM+?
All MAX4802CTM+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4802CTM+, 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 MAX4802CTM+ part is unused and in its original packaging.
Return procedure for MAX4802CTM+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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