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Analog Devices Inc./Maxim Integrated MAX4802CQI
- Part No.:
- MAX4802CQI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
MAX4802CQI.pdf
- Description:
- IC SW SPSTX8 25OHM 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,874
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Product details
Overview
The MAX4802CQI 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, supports VPP/VNN up to +40V/–160V (200V total), delivers ≤27Ω on-resistance at 200mA, and operates with digital supply VDD from +2.7V to +13.2V. Its low-charge-injection (350pC) and –77dB off-isolation at 5MHz enable precise signal integrity in pulsed ultrasound beamforming.
For engineers reviewing the MAX4802CQI datasheet, MAX4802CQI pinout, MAX4802CQI application, or MAX4802CQI equivalent, this page provides verified technical context, real-world design meaning of key specs, validated PLCC-28 pin mapping, confirmed drop-in replacement status versus HV232PJ, and application-specific implementation guidance for high-voltage analog switching in medical and industrial systems.
Technical Context
The MAX4802CQI implements eight independent BCDMOS-based SPST switches controlled via a serial 8-bit shift register with latch enable (LE) and clear (CLR). Each switch supports analog signals from VNN +10V to VPP –10V and includes internal 35kΩ bleed resistors tied to RGND - a feature exclusive to the MAX4802 variant and absent in MAX4800/MAX4801.
Digital inputs (DIN, CLK, LE, CLR) are +13.2V tolerant regardless of VDD level; DOUT enables daisy-chaining multiple devices. Power-on reset ensures all switches default open, and timing allows 5µs turn-on/off with 50kHz max switching frequency under load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VPP/VNN Range | +40V/–160V to +185V/–15V (200V max differential); enables single-supply operation up to +200V when VNN = GND |
| RONS | ≤27Ω at 200mA (TA = +70°C); ensures minimal IR drop and power loss in high-current transducer drive paths |
| Charge Injection | 350pC (VPP = +160V, VNN = –40V); critical for preserving baseline stability in time-of-flight ultrasound measurements |
| Off-Isolation | –77dB at 5MHz (RL = 50Ω); suppresses crosstalk between adjacent channels during multi-element beam steering |
| Bleed Resistors | 35kΩ per terminal (COM/NO) to RGND; discharges piezoelectric capacitance without external components, reducing board area and EMI risk |
| Logic Input Tolerance | +13.2V tolerant DIN/CLK/LE/CLR; allows direct interface with 5V/12V microcontrollers without level-shifting |
| tON/tOFF | 5µs typical; supports fast pulse sequencing required for real-time ultrasound frame rates |
Pinout & Package
The MAX4802CQI is housed in a 28-pin PLCC (Plastic Leaded Chip Carrier) package with 0.050" lead pitch and JEDEC MO-097AC outline. Pin 1 is located at the index corner; thermal pad is not present. RGND (Pin 11) is unique to MAX4802 and must be connected to system ground for bleed resistor functionality.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM0–COM7 | Analog common terminals (8) | High-voltage return path for each channel; must remain within VNN to VPP during power-up |
| NO0–NO7 | Analog normally-open terminals (8) | Switched outputs routed to transducers or print heads; each has integrated 35kΩ bleed to RGND |
| VPP / VNN | High-voltage supplies | VPP = positive rail (up to +185V), VNN = negative rail (down to –160V); bypass each with ≥0.1µF ceramic capacitor |
| VDD / GND / RGND | Digital supply, ground, bleed ground | VDD = +2.7V to +13.2V logic supply; RGND (Pin 11) is dedicated ground for bleed resistors - separate from GND (Pin 13) |
| DIN / CLK / LE / CLR / DOUT | Serial control interface | 4-wire SPI-like interface with daisy-chain capability; LE active-low latches data; CLR active-high resets all switches open |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bleed resistors | 35kΩ per COM/NO terminal referenced to RGND - eliminates need for 16 external resistors in ultrasound probe PCB layouts |
| Low-charge injection | 350pC maximum - prevents baseline drift in echo-receiving circuits where DC-coupled amplifiers follow the switch |
| Wide high-voltage range | VPP – VNN ≤ 200V with asymmetric support (e.g., +40V/–160V) - matches legacy HV supply rails in medical imaging systems |
| Pin-compatible replacement | Direct drop-in for Supertex HV232PJ in 28-pin PLCC footprint - no PCB redesign required for legacy system upgrades |
| Power-on reset | Guarantees all 8 switches start open at power-up - prevents unintended transducer excitation or print-head activation |
Applications
| Ultrasound Transducer Multiplexing | Industrial Printer Head Control |
|---|---|
|
Use Scenario: Selecting individual elements in a 128-element linear array for phased-array beamforming. IC Role / Device Role / Timing Role: High-voltage SPST switch routing HV pulses (±100V, 50ns rise) to specific piezoelectric elements while isolating inactive channels. Use Value: 35kΩ bleed resistors discharge element capacitance between pulses, enabling <1µs settling and eliminating ghost echoes in near-field imaging. |
Use Scenario: Driving high-capacitance thermal inkjet printheads requiring ±80V pulsing across 8 independent nozzles. IC Role / Device Role / Timing Role: Analog switch enabling precise timing-controlled voltage application to nozzle electrodes with minimal charge injection-induced droplet misdirection. Use Value: ≤27Ω RONS limits voltage droop during 1A peak current pulses, ensuring consistent droplet volume and print resolution. |
| Capacitive Load Discharge Systems | High-Voltage Test Equipment Switching |
|
Use Scenario: Safely discharging 10nF–100nF capacitive loads in automated test fixtures after HV bias application. IC Role / Device Role / Timing Role: Bidirectional bleed path (via COM/NO → RGND) that replaces manual discharge probes and relay-based safety circuits. Use Value: Integrated 35kΩ resistors provide predictable 350µs–3.5ms RC time constants - eliminating external components and improving test repeatability. |
Use Scenario: Routing ±150V calibration signals between DUT ports in semiconductor parametric testers. IC Role / Device Role / Timing Role: Precision analog switch providing >77dB off-isolation at 5MHz to prevent signal leakage between measurement channels. Use Value: –77dB isolation and <11pF off-capacitance maintain signal fidelity for sub-mV-level measurements in high-impedance test setups. |
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 |
|---|---|---|---|
| HV232PJ | Original Supertex part; identical pinout and function but lacks integrated bleed resistors and requires external discharge paths | Same ultrasound/printer use cases, but adds BOM cost and layout area for 16 external 35kΩ resistors | Select MAX4802CQI when minimizing component count and board space is critical; HV232PJ only if legacy qualification mandates exact original part |
| MAX4800CQI | No bleed resistors; otherwise identical pinout, timing, and electrical specs - same PLCC-28 package and VPP/VNN ratings | Suitable for applications where capacitive loads are negligible or externally discharged; not usable where automatic bleed is required | Choose MAX4802CQI over MAX4800CQI exclusively when driving piezoelectric transducers or other high-C loads needing guaranteed discharge between cycles |
Compared with HV232PJ and MAX4800CQI, the MAX4802CQI uniquely integrates 35kΩ bleed resistors per channel - delivering measurable reductions in PCB area, BOM count, and post-pulse settling time, without compromising on high-voltage rating, on-resistance, or isolation performance.
Availability
The MAX4802CQI is available at Aetrix Electronics and suitable for ultrasound imaging systems, industrial printer head drivers, and high-voltage test equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MAX4802CQI 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 U.S.-based semiconductor company specializing in precision analog, mixed-signal, and high-voltage interface solutions for demanding industrial and medical applications.
The MAX4800/MAX4801/MAX4802 product line was engineered specifically for high-reliability, high-voltage analog switching in ultrasound beamforming and industrial printing - emphasizing low charge injection, robust off-isolation, and integrated safety features like bleed resistors and power-on reset.
FAQ
What is the purpose of the RGND pin on the MAX4802CQI?
The RGND pin (Pin 11) on the MAX4802CQI serves as the dedicated return path for the integrated 35kΩ bleed resistors connected to each COM and NO terminal. Unlike the main GND (Pin 13), RGND must be connected to system ground to enable automatic discharge of capacitive loads - a core differentiator of the MAX4802CQI versus MAX4800CQI and MAX4801CQI. This pin is not present on non-MAX4802 variants.
Is the MAX4802CQI a direct replacement for the Supertex HV232PJ?
Yes, the MAX4802CQI is a documented drop-in replacement for the Supertex HV232PJ in the 28-pin PLCC package. Pin assignments, timing, voltage ratings, and logic interface are identical. The key enhancement is integrated 35kΩ bleed resistors - meaning MAX4802CQI can replace HV232PJ without layout changes while eliminating 16 external resistors required by the legacy part.
What is the maximum analog signal frequency supported by the MAX4802CQI?
The MAX4802CQI supports analog signals from DC to 10MHz, as specified in its features list. At 5MHz, it achieves –77dB off-isolation and –80dB crosstalk (RL = 50Ω), making it suitable for ultrasound receive-path switching where wideband signal integrity is essential. Performance degrades above 10MHz due to increasing capacitive coupling and reduced isolation.
How does the MAX4802CQI handle power supply sequencing?
The MAX4802CQI does not require strict VDD/VPP/VNN sequencing. However, analog inputs (COM_/NO_) must either be unconnected or held within VNN to VPP during power-up and power-down to prevent latch-up. All supplies should be bypassed with ≥0.1µF ceramic capacitors placed close to their respective pins - especially critical for VPP and VNN to suppress switching noise.
Can multiple MAX4802CQI devices be daisy-chained using the DOUT pin?
Yes, the DOUT pin enables daisy-chaining: connect DOUT of one MAX4802CQI to DIN of the next device. CLK, LE, and CLR lines are shared across all devices in the chain. A single 8-bit data stream shifts through the entire chain; pulsing LE low simultaneously updates all latches. This allows scalable control of up to 64+ channels using only four control lines and one data stream.
MAX4802CQI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Switch Circuit:
- SPST - Open
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 8
- On-State Resistance (Max):
- 25Ohm
- Channel-to-Channel Matching (ΔRon):
- 1.25Ohm
- 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)):
- 11pF
- 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:
- 28-PLCC (11.5x11.5)
MAX4802CQI FAQ
1.How can I place an order for MAX4802CQI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4802CQI 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 MAX4802CQI reliable?
The price and inventory of MAX4802CQI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4802CQI is usually 5 days.
3.What payment methods are accepted for MAX4802CQI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4802CQI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4802CQI?
MAX4802CQI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4802CQI 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 MAX4802CQI?
For technical support, including MAX4802CQI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4802CQI requirements.
6.How does Aetrix verify that MAX4802CQI is sourced from the original manufacturer or authorized distributors?
All MAX4802CQI 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 MAX4802CQI meets industry standards.
7.What is the process for return or replacement of MAX4802CQI?
All MAX4802CQI units undergo pre-shipment inspection (PSI). If there is an issue with MAX4802CQI, 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 MAX4802CQI part is unused and in its original packaging.
Return procedure for MAX4802CQI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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