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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 SWITCH SPST-NOX8 38OHM 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,030
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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 low-charge-injection (350pC), 22Ω on-resistance, integrated 35kΩ bleed resistors per channel, ±100V/±160V/±185V high-voltage supply flexibility, and serial digital interface with +13.2V-tolerant inputs. It operates across 0°C to +70°C in 28-pin PLCC packaging.
For engineers reviewing the MAX4802CQI+ datasheet, MAX4802CQI+ pinout, MAX4802CQI+ application, or MAX4802CQI+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain readiness for medical ultrasound and precision printing systems.
Technical Context
The MAX4802CQI+ implements eight independent high-voltage SPST switches fabricated in BCDMOS process, each supporting analog signal ranges from VNN + 10V to VPP − 10V (e.g., −90V to +90V at ±100V supplies). Its 8-bit serial shift register accepts MSB-first data via DIN/CLK, latched by active-low LE, with DOUT enabling daisy-chaining.
Unlike MAX4800/MAX4801, the MAX4802CQI+ integrates a dedicated RGND terminal and 35kΩ bleed resistors on every COM_ and NO_ terminal to actively discharge piezoelectric capacitive loads-critical for echo decay management in ultrasound front-ends. Power-on reset ensures all switches default open.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Count | 8 independent SPST channels - enables full transducer array multiplexing without external routing logic. |
| On-Resistance (RONS) | 22Ω typical - minimizes signal attenuation and power loss in high-voltage analog paths up to 200V differential. |
| Charge Injection | 350pC - reduces voltage glitches at switch transitions, preserving signal integrity in precision time-of-flight measurements. |
| Off-Isolation | −77dB at 5MHz - suppresses crosstalk between adjacent channels during high-frequency echo reception. |
| Bleed Resistors | 35kΩ per terminal (COM_/NO_) - discharges piezo capacitance rapidly post-switching, preventing residual voltage buildup. |
| Supply Range (VPP/VNN) | +40V/−160V to +185V/−15V - supports asymmetric HV rails required by legacy and next-gen ultrasound architectures. |
| Digital Input Tolerance | +13.2V independent of VDD - allows direct interfacing with 5V/12V microcontrollers without level-shifting circuitry. |
Pinout & Package
MAX4802CQI+ uses a 28-pin PLCC package (package code Q28-4) with 0.050" lead pitch and body size 0.470" × 0.470". Pin 1 is marked with a beveled corner; pin 27 is RGND (bleed resistor ground), unique to MAX4802 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COM0–COM7 | Analog common terminals | Eight bidirectional high-voltage inputs tied to transducer elements or print head drivers; must remain unconnected or within VNN–VPP range during power sequencing. |
| NO0–NO7 | Analog normally-open terminals | Eight high-voltage outputs routed to receive chains or driver stages; each connected internally to its COM_ via switch controlled by corresponding data bit. |
| VPP / VNN | High-voltage supply rails | Supports up to 200V differential (e.g., +100V/−100V); requires ≥0.1µF ceramic bypass to GND at each pin for stability under fast switching. |
| RGND | Bleed resistor reference | Ground return for all 16 integrated 35kΩ bleed resistors; must be connected to system ground to enable capacitive discharge functionality. |
| DIN / CLK / LE / CLR | Serial control interface | MSB-first 8-bit shift register control: LE active-low loads latch; CLR high resets all switches open; all inputs tolerate +13.2V regardless of VDD. |
| VDD | Digital supply | +2.7V to +13.2V operation - powers logic core only; decoupling capacitor mandatory to prevent clock feedthrough noise coupling into analog path. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated bleed resistors | 35kΩ per COM_/NO_ terminal referenced to RGND - eliminates need for external discharge networks in ultrasound probe modules. |
| Low-charge-injection switching | 350pC typical - prevents baseline shift in time-gain-compensated echo signals, critical for dynamic range preservation. |
| Wide high-voltage supply flexibility | VPP/VNN combinations including +100V/−100V, +185V/−15V, +40V/−160V - accommodates diverse transducer biasing schemes and legacy printer voltages. |
| DC to 10MHz analog bandwidth | Full small-signal passband - supports both pulsed excitation (1–5MHz) and broadband echo reception in modern ultrasound systems. |
| Power-on reset | Guaranteed open-state initialization - prevents unintended transducer activation or print head firing at system startup. |
Applications
| Ultrasound Transducer Multiplexing | Industrial Inkjet Print Head Control |
|---|---|
|
Use Scenario: Selecting individual piezoelectric elements in a 128-element linear array for beam steering and focusing. IC Role / Device Role / Timing Role: High-voltage SPST switch enabling channel-by-channel excitation/reception path isolation with sub-5µs turn-on/off timing. Use Value: 35kΩ bleed resistors discharge element capacitance between pulses, reducing ring-down time and improving axial resolution. |
Use Scenario: Driving high-voltage waveforms to thermal or piezoelectric inkjet nozzles in wide-format production printers. IC Role / Device Role / Timing Role: Precision analog switch routing 100V pulses to nozzle electrodes under microcontroller serial command. Use Value: 22Ω RONS and <−77dB off-isolation minimize waveform distortion and inter-nozzle crosstalk at 50kHz switching. |
| Capacitive Load Discharge Management | High-Voltage Data Acquisition Front-End |
|
Use Scenario: Safely discharging stored energy in large-area capacitive sensors after measurement cycles in NDT equipment. IC Role / Device Role / Timing Role: Integrated bleed path activated automatically when switches are open, eliminating need for external FET-based discharge circuits. Use Value: RGND-referenced 35kΩ resistors provide predictable 10–20µs RC time constant for rapid, repeatable sensor reset. |
Use Scenario: Isolating high-voltage test signals (±100V) from low-voltage ADC input stages in automated test equipment. IC Role / Device Role / Timing Role: Bidirectional analog switch with VNN-to-VPP signal range and <100mV DC offset, protecting downstream circuitry. Use Value: −77dB off-isolation at 5MHz blocks high-frequency interference from HV stimulus sources during sensitive measurement windows. |
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 | Pin-compatible Supertex second source; identical 28-pin PLCC footprint and bleed resistor integration; same 35kΩ value and RGND pin. | No functional difference in ultrasound or printer use cases; identical timing, leakage, and isolation specs per datasheet cross-reference. | Select HV232PJ if dual-sourcing or long-term obsolescence mitigation is required; fully interchangeable with MAX4802CQI+ in existing layouts. |
| MAX4800CQI | Lacks integrated bleed resistors and RGND pin; otherwise identical pinout, timing, and switching specs; requires external discharge network. | Not suitable for piezo-capacitive load discharge without added components; increases BOM count and PCB area in ultrasound designs. | Choose MAX4802CQI+ over MAX4800CQI when rapid capacitive discharge is mandatory; MAX4800CQI remains viable where external bleed is acceptable. |
Compared with HV232PJ, MAX4802CQI+ offers identical functionality and drop-in compatibility, while MAX4800CQI lacks on-die bleed resistors-requiring external components to achieve equivalent discharge performance in transducer applications.
Availability
MAX4802CQI+ is available at Aetrix Electronics and suitable for ultrasound imaging systems, industrial inkjet printers, and high-voltage data acquisition front-ends requiring stable component supply, long-lifecycle support, 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 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 transducer arrays and industrial print heads-emphasizing low charge injection, integrated discharge, and robust supply flexibility.
FAQ
What is the function of the RGND pin on the MAX4802CQI+?
The RGND pin on the MAX4802CQI+ serves as the dedicated ground reference for all 16 integrated 35kΩ bleed resistors (one per COM_ and NO_ terminal). It must be connected to system ground to enable automatic discharge of capacitive loads-such as piezoelectric transducers-after switching. This feature is exclusive to MAX4802 variants and is not present on MAX4800CQI or MAX4801CQI.
Does the MAX4802CQI+ support asymmetric high-voltage supplies like +185V/−15V?
Yes, the MAX4802CQI+ explicitly supports asymmetric high-voltage configurations including +185V/−15V, +100V/−100V, and +40V/−160V, with VPP − VNN ≤ 200V. This capability is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, enabling flexible biasing for legacy ultrasound systems and specialized printer architectures.
How does the MAX4802CQI+ differ from the MAX4800CQI in terms of bleed resistor implementation?
The MAX4802CQI+ integrates 35kΩ bleed resistors on every COM_ and NO_ terminal, referenced to the dedicated RGND pin. The MAX4800CQI lacks both the resistors and the RGND pin entirely-requiring external discharge circuitry. This difference is documented in the General Description, Features, and Pin Descriptions sections of the MAX4800/MAX4801/MAX4802 datasheet.
Can the MAX4802CQI+ be daisy-chained with other MAX4800-series devices?
Yes, the MAX4802CQI+ supports daisy-chaining via its DOUT pin, which outputs shifted data delayed by eight clocks. Multiple MAX4802CQI+ units (or mixed with MAX4800CQI/MAX4801CQI) can be cascaded by connecting DOUT of one device to DIN of the next, while sharing CLK, LE, and CLR lines-enabling synchronized control of up to 64 channels with a single microcontroller interface.
What is the guaranteed turn-on/turn-off time specification for the MAX4802CQI+?
The MAX4802CQI+ has a guaranteed maximum turn-on time (tON) and turn-off time (tOFF) of 5µs each, measured under VNO_ = VPP − 10V and RL = 10kΩ with VNN ranging from −40V to −160V. This timing is specified across the full 0°C to +70°C operating temperature range and is consistent across all eight channels.
MAX4802CQI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 28-PLCC (11.51x11.51)
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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