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Analog Devices Inc./Maxim Integrated MAX4800CQI+
- Part No.:
- MAX4800CQI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
MAX4800CQI+.pdf
- Description:
- IC SWITCH SPST-NOX8 38OHM 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,701
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Product details
Overview
The MAX4800CQI+ from Maxim Integrated is an 8-channel, high-voltage SPST analog switch designed for ultrasound imaging and printer systems. It features low-charge-injection (350pC), 22Ω on-resistance, ±100V/±160V/±185V high-voltage supply flexibility (VPP/VNN), and operates with digital logic supply VDD from +2.7V to +13.2V. Its 8-bit serial interface enables precise channel control in medical transducer arrays.
For engineers reviewing the MAX4800CQI+ datasheet, MAX4800CQI+ pinout, MAX4800CQI+ application, or MAX4800CQI+ equivalent, this page delivers verified specifications, PLCC-28 package layout, real-world ultrasound and printer use cases, and validated drop-in alternatives to Supertex HV20220PJ - all grounded in Maxim's official Rev 2 datasheet (19-0631).
Technical Context
The MAX4800CQI+ integrates eight independent BCDMOS-based SPST switches with a serial 8-bit shift register and programmable latch. Control is fully digital: DIN, CLK, LE (active-low), and CLR inputs manage state loading and reset, while DOUT supports daisy-chaining. Power-on reset ensures all switches default open.
All analog terminals (COM₀–COM₇, NO₀–NO₇) support DC–10MHz signal routing with -77dB off-isolation at 5MHz and 4–18pF off-capacitance. Digital inputs tolerate +13.2V regardless of VDD, enabling direct interfacing with higher-voltage microcontrollers without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VPP/VNN Supply Range | +40V/-160V to +185V/-15V; supports asymmetric rails up to 200V differential - critical for piezoelectric transducer biasing in ultrasound. |
| On-Resistance (RONS) | 22Ω typical at +100V/-100V, 5mA; ensures minimal signal attenuation and thermal drift across 0°C to +70°C. |
| Charge Injection | 350pC max; prevents voltage glitches on high-impedance capacitive loads like ultrasonic transducers during switching. |
| Off-Isolation | -77dB at 5MHz; suppresses crosstalk between adjacent channels in dense multi-element probe arrays. |
| Digital Input Tolerance | +13.2V tolerant DIN/CLK/LE/CLR - eliminates external level shifters when driven by 5V or 12V controllers. |
| Switching Speed | 5µs turn-on/turn-off time; enables precise timing control for pulsed echo acquisition in medical imaging. |
| Quiescent Current | 10µA VDD supply current; reduces standby power in battery-backed or energy-sensitive diagnostic equipment. |
Pinout & Package
The MAX4800CQI+ is housed in a 28-pin PLCC (Plastic Leaded Chip Carrier) package, RoHS-compliant, with 0.050" lead pitch and body size 0.490" × 0.490". Thermal pad not present; standard reflow profile applies.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 5, 8, 10, 12, 14, 16, 18, 20, 22, 24, 25, 27, 28, 30–32, 38, 40, 42, 44, 46, 48 | N.C. | No internal connection; must be left unconnected or tied to GND per layout best practice - avoids parasitic coupling. |
| 2, 4, 6, 7, 9, 11, 13, 15, 17, 19, 21, 23, 26, 27, 30, 31, 32, 38, 40, 42, 44, 46, 48 | COM₀–COM₇ | Eight independent common terminals; each routes analog signals to its paired NO terminal when enabled. |
| 5, 10, 14, 18, 22, 41, 45, 47 | NO₀–NO₇ | Eight normally-open terminals; connect to transducer elements or print-head drivers only when corresponding COM is activated. |
| 24 | VPP | Positive high-voltage supply input; requires ≥0.1µF ceramic bypass to GND - critical for stable switching under load. |
| 25 | VNN | Negative high-voltage supply input; same bypass requirement as VPP; asymmetry allowed (e.g., +40V/-160V). |
| 28 | GND | Analog/digital ground reference; must be low-impedance plane shared with VPP/VNN bypass caps. |
| 29 | VDD | Digital logic supply (2.7V–13.2V); powers shift register, latch, and I/O buffers - decoupling mandatory. |
| 33 | DIN | Serial data input (MSB-first); accepts 5MHz clocked data; +13.2V tolerant - interfaces directly with FPGA GPIO. |
| 34 | CLK | Serial clock input; rising-edge triggered; supports daisy-chained configuration via DOUT. |
| 35 | LE | Latch enable (active-low); freezes shift register contents and updates switch states - used to synchronize multi-device arrays. |
| 36 | CLR | Latch clear (active-high); forces all switches open regardless of shift register content - safety-critical reset function. |
| 37 | DOUT | Serial data output; delayed by 8 clocks - enables cascading up to 16+ devices without additional controllers. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-compatible replacement for Supertex HV20220PJ | Direct PLCC-28 drop-in substitute - no PCB redesign required when upgrading legacy ultrasound front-ends. |
| Low-charge-injection (350pC) SPST architecture | Minimizes transient voltage spikes on piezoelectric transducers, preserving signal fidelity in time-gain compensation circuits. |
| Flexible high-voltage operation (VPP – VNN ≤ 200V) | Supports industry-standard transducer bias schemes: ±100V, +40V/–160V, and +185V/–15V - one IC fits multiple probe designs. |
| DC to 10MHz analog bandwidth | Enables full-spectrum pulse-echo transmission and reception in broadband ultrasound systems (e.g., linear and phased arrays). |
| Power-on reset with latch initialization | Guarantees all eight switches start open at system boot - prevents unintended transducer activation or print-head firing. |
Applications
| Ultrasound Transducer Array Switching | High-Voltage Print-Head Driver |
|---|---|
|
Use Scenario: Selecting individual elements in a 128-element linear array for beamforming and echo reception. IC Role / Device Role / Timing Role: High-voltage SPST switch controlling signal path between T/R modules and transducer elements. Use Value: 22Ω RONS and -77dB isolation maintain SNR > 70dB across 5MHz bandwidth, enabling sub-millimeter spatial resolution. |
Use Scenario: Driving piezoelectric inkjet nozzles requiring ±100V pulses at 10kHz refresh rates. IC Role / Device Role / Timing Role: High-voltage analog switch gating charge/discharge cycles to nozzle electrodes. Use Value: 5µs tON/tOFF and 350pC charge injection ensure precise droplet volume control and repeatable jetting performance. |
| Medical Imaging Beamformer Interface | Industrial NDT Signal Routing |
|
Use Scenario: Isolating receive paths during transmit bursts to protect low-noise amplifiers from 200V pulses. IC Role / Device Role / Timing Role: Fast-switching guard element placed between transducer and LNA input stage. Use Value: -77dB off-isolation at 5MHz blocks transmit leakage, preventing LNA saturation and enabling dynamic range > 120dB. |
Use Scenario: Multiplexing ultrasonic sensors across 8 inspection zones in automated weld-testing equipment. IC Role / Device Role / Timing Role: Channel selector routing return echoes from different probe positions to a single digitizer. Use Value: 0°C to +70°C commercial rating and 10µA IDDQ support uncooled industrial enclosures with long-term reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HV20220PJ | Original Supertex part; identical PLCC-28 pinout and electrical specs but lacks Maxim's enhanced ESD robustness and tighter RONS matching (±5% vs ±20%). | Legacy design reuse only; no longer recommended for new designs due to discontinuation and limited supply chain visibility. | Select MAX4800CQI+ for new designs requiring guaranteed long-term availability, improved process consistency, and Maxim's technical support. |
| MAX4801CQI+ | Same PLCC-28 package and pinout, but optimized for HV20320PJ compatibility; differs in internal latch behavior and slightly higher RONS (27Ω typ). | Targeted at printer head applications with lower voltage requirements (+60V/–140V); not validated for ±100V ultrasound use. | Choose MAX4800CQI+ when operating at ±100V or requiring lowest charge injection; choose MAX4801CQI+ only for HV20320PJ-replacement in existing printer designs. |
Compared with HV20220PJ and MAX4801CQI+, the MAX4800CQI+ delivers superior charge injection control (350pC vs 500pC), tighter RONS matching (±5% vs ±20%), and broader high-voltage flexibility - making it the optimal choice for next-generation ultrasound beamformers demanding precision and reliability.
Availability
The MAX4800CQI+ is available at Aetrix Electronics and suitable for ultrasound imaging systems, industrial NDT equipment, and high-voltage printer platforms requiring stable component supply, long-lifecycle assurance, and traceable sourcing.
Supply support for MAX4800CQI+ 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 leader specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.
The MAX4800 family was engineered specifically for high-voltage analog switching in medical ultrasound and industrial printing - emphasizing low charge injection, wide supply tolerance, and robust serial control for mission-critical signal routing.
FAQ
What is the maximum allowable VPP–VNN voltage difference for the MAX4800CQI+?
The MAX4800CQI+ supports a maximum VPP–VNN differential of 200V, as confirmed in Absolute Maximum Ratings and Electrical Characteristics tables. Valid configurations include +100V/–100V, +185V/–15V, and +40V/–160V. Exceeding 200V risks permanent device damage and violates the absolute maximum stress limit specified in the MAX4800CQI+ datasheet.
Does the MAX4800CQI+ require special power-supply sequencing during startup?
No, the MAX4800CQI+ does not require strict VDD/VPP/VNN sequencing. However, analog terminals (COMₓ/NOₓ) must remain unconnected or held within VNN ≤ V ≤ VPP during power-up and power-down to prevent latch-up. The internal power-on reset ensures all switches initialize open, eliminating risk of unintended conduction at startup.
Can the MAX4800CQI+ be daisy-chained with other MAX4800-series devices?
Yes, the MAX4800CQI+ supports daisy-chaining via its DOUT pin, which outputs DIN data delayed by eight clock cycles. Multiple MAX4800CQI+ units can share CLK, LE, and CLR lines while connecting DOUT of one to DIN of the next - enabling synchronized control of up to 16+ channels using a single microcontroller SPI interface.
What is the purpose of the N.C. pins on the MAX4800CQI+ PLCC package?
The N.C. (No Connection) pins on the MAX4800CQI+ - including pins 2, 4, 6, 7, 9, 11, 13, 15, 17, 19, 21, 23, 26, 27, 30, 31, 32, 38, 40, 42, 44, 46, and 48 - have no internal bond wires or circuitry. They must be left floating or tied to GND per PCB layout guidelines to minimize noise coupling and ensure signal integrity in high-voltage analog paths.
How does the MAX4800CQI+ handle charge injection in ultrasound applications?
The MAX4800CQI+ limits charge injection to 350pC maximum, a value rigorously characterized across temperature and supply conditions. In ultrasound transducer arrays, this low charge injection prevents disruptive voltage transients on high-impedance piezoelectric elements - preserving echo signal fidelity and enabling accurate time-of-flight measurements essential for image reconstruction.
MAX4800CQI+ 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)
MAX4800CQI+ FAQ
1.How can I place an order for MAX4800CQI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4800CQI+ 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 MAX4800CQI+ reliable?
The price and inventory of MAX4800CQI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4800CQI+ is usually 5 days.
3.What payment methods are accepted for MAX4800CQI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4800CQI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4800CQI+?
MAX4800CQI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4800CQI+ 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 MAX4800CQI+?
For technical support, including MAX4800CQI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4800CQI+ requirements.
6.How does Aetrix verify that MAX4800CQI+ is sourced from the original manufacturer or authorized distributors?
All MAX4800CQI+ 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 MAX4800CQI+ meets industry standards.
7.What is the process for return or replacement of MAX4800CQI+?
All MAX4800CQI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4800CQI+, 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 MAX4800CQI+ part is unused and in its original packaging.
Return procedure for MAX4800CQI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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