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Analog Devices Inc./Maxim Integrated MAX1292BCEG+T
- Part No.:
- MAX1292BCEG+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1292BCEG+T.pdf
- Description:
- IC ADC 12BIT SAR 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,347
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Product details
Overview
MAX1292BCEG+T from Maxim Integrated is a 12-bit successive-approximation ADC with integrated +2.5V reference, 4-channel single-ended / 2-channel pseudo-differential analog input multiplexer, byte-wide parallel (8+4) interface, and software-configurable unipolar/bipolar operation. It operates from a single +5V analog supply and supports digital logic levels from +2.7V to +5.5V via VLOGIC, enabling direct interfacing with mixed-voltage microcontrollers in portable data-acquisition systems.
For engineers reviewing the MAX1292BCEG+T datasheet, MAX1292BCEG+T pinout, MAX1292BCEG+T application, or MAX1292BCEG+T equivalent, key selection criteria include its 400ksps sampling rate, ±0.5 LSB INL, 2.5mA active current at full speed, 2µs wake-up from shutdown, and 24-pin QSOP package compatibility with space-constrained industrial sensor nodes and battery-powered medical monitors.
Technical Context
The MAX1292BCEG+T implements a capacitive charge-redistribution SAR architecture with an internal track-and-hold stage offering 6MHz full-power bandwidth and 350kHz full-linear bandwidth. Its analog input structure supports both single-ended (CH0–CH3 referenced to COM) and pseudo-differential (CH0/CH1, CH2/CH3 pairs) modes, with COM serving as the stable zero-code reference.
Conversion is initiated via an 8-bit control byte written through the parallel interface, configuring acquisition mode (internal/external), clock source (internal/external), power-down state, and channel selection. The device features HBEN-controlled 12-bit data multiplexing onto an 8-bit bus and tri-states INT on CS high for clean microprocessor interrupt handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for precision measurement of analog sensor signals. |
| Sampling Rate | 400ksps - supports real-time digitization of fast transients such as motor current spikes or ECG waveforms. |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error across temperature for calibrated systems. |
| Supply Current | 2.5mA at 400ksps - enables low-power operation in battery-backed data loggers without thermal derating. |
| Reference | +2.5V internal - eliminates external reference component count and layout sensitivity in compact designs. |
| Interface | Byte-wide parallel (8+4) - simplifies connection to 8-bit microcontrollers using standard address/data bus protocols. |
| Package | 24-pin QSOP - provides 3.9mm × 8.7mm footprint compatible with automated SMT assembly and IPC-7351B land patterns. |
Pinout & Package
MAX1292BCEG+T is housed in a 24-pin QSOP (Quad Small Outline Package) with 0.635mm pitch, JEDEC MS-013AC compliant, and rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 HBEN | High Byte Enable | Selects MSB (D8–D11) or LSB (D0–D7) output on shared data bus - enables 8-bit MCU interface without external latch. |
| 2–9 D7–D0/D11–D8 | Three-State Digital I/O | Bidirectional 8-bit data bus with high-byte multiplexing - reduces PCB trace count and simplifies routing. |
| 10 INT | Interrupt Output | Active-low conversion-complete flag - allows CPU to enter low-power wait states until result is ready. |
| 11 RD | Active-Low Read Select | Triggers data output enable when CS is low - synchronizes read timing with microcontroller bus cycles. |
| 12 WR | Active-Low Write Select | Latches control byte and initiates acquisition/conversion - supports both internal and external acquisition timing modes. |
| 13 CLK | Clock Input | Accepts external 100kHz–7.6MHz clock or connects to VDD/GND for internal clock mode - decouples timing control from host processor. |
| 14 CS | Active-Low Chip Select | Enables device and tri-states outputs when high - permits multiple ADCs on same data bus with address decoding. |
| 15–18 CH3–CH0 | Analog Input Channels | Four single-ended inputs or two pseudo-differential pairs - supports multi-sensor monitoring with shared COM reference. |
| 19 COM | Analog Ground Reference | Zero-code voltage reference point - must be stable to ±0.5 LSB during conversion for specified accuracy. |
| 20 GND | Analog & Digital Ground | Common return for analog and digital sections - requires star grounding to minimize noise coupling into T/H stage. |
| 21 REFADJ | Reference Buffer Input | Disables internal bandgap when tied to VDD - enables use of external precision reference for metrology-grade applications. |
| 22 REF | Reference Output/Input | Provides +2.5V internal reference or accepts external reference - bypassed with 4.7µF capacitor for low-noise stability. |
| 23 VDD | +5V Analog Supply | Powers analog core and T/H stage - requires 0.1µF ceramic bypass to GND near pin for high-frequency PSR. |
| 24 VLOGIC | +2.7V to +5.5V Digital Supply | Separately powers digital I/O - allows interfacing with 3.3V or 5V microcontrollers without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended (4 channels) or pseudo-differential (2 pairs) via control byte - eliminates hardware jumper changes during prototyping. |
| Two power-down modes | Standby (1µA) and full shutdown (2µA) - extends battery life in intermittent-sampling applications like environmental sensors. |
| Internal 6MHz T/H bandwidth | Supports undersampling of >100kHz signals - enables RF front-end digitization without anti-alias filter complexity. |
| Tri-state INT output | Automatically high-impedance when CS is high - prevents bus contention in multi-device systems without external pull-ups. |
| User-adjustable VLOGIC | +2.7V to +5.5V logic supply range - accommodates legacy 5V and modern 3.3V microcontrollers on same board design. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
Use Scenario: Continuous monitoring of temperature, pressure, and flow sensors in PLC-based factory automation cabinets. IC Role / Device Role / Timing Role: 12-bit ADC digitizing 4 analog sensor outputs with simultaneous sampling capability and low-latency interrupt-driven reads. Use Value: ±0.5 LSB INL ensures repeatable calibration across operating temperature, while 400ksps sampling captures transient valve actuation events without aliasing. |
Use Scenario: Portable ECG and SpO₂ monitor acquiring biopotential signals from dry-electrode sensors. IC Role / Device Role / Timing Role: Low-power ADC performing pseudo-differential measurements on CH0/CH1 (ECG) and CH2/CH3 (SpO₂ LED drive feedback). Use Value: 2.5mA active current and 2µs wake-up enable 24-hour battery operation; internal +2.5V reference eliminates drift-prone external components. |
| Energy Metering Subsystem | Touchscreen Controller Interface |
Use Scenario: Secondary metering channel in smart electricity meters measuring auxiliary parameters like neutral current or temperature compensation. IC Role / Device Role / Timing Role: High-accuracy ADC converting isolated shunt voltage drops with bipolar input mode for bidirectional current detection. Use Value: ±0.5 LSB INL and ±1 LSB DNL meet IEC 62053-21 Class 0.5 accuracy requirements; software-selectable unipolar/bipolar mode avoids external op-amp inversion circuitry. |
Use Scenario: Resistive touchscreen digitizer in handheld HMI devices requiring precise X/Y coordinate extraction from analog voltage dividers. IC Role / Device Role / Timing Role: 4-channel ADC sequentially scanning X+ X− Y+ Y− electrodes with single-ended mode and COM-referenced zero alignment. Use Value: 24-pin QSOP footprint fits tight bezel layouts; VLOGIC support for 3.3V logic matches common ARM Cortex-M host processors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1292ACEG+ | Same 24-pin QSOP package and pinout; guaranteed ±0.5 LSB INL over 0°C to +70°C (vs. ±1 LSB for MAX1292BCEG+T) | Required where full-temperature linearity spec must be met without calibration - e.g., certified medical devices. | Select MAX1292ACEG+ when absolute linearity across full temperature range is mandatory; MAX1292BCEG+T suffices for cost-sensitive industrial controls. |
| ADS7822U | 8-bit resolution, SPI interface, 200ksps max rate, no internal reference - smaller 8-pin SOIC package but lower performance and different protocol. | Suitable for non-critical position sensing or basic battery monitoring where 12-bit precision and parallel interface are unnecessary. | Choose ADS7822U only for ultra-low-cost, low-resolution applications with SPI-capable hosts; not a functional replacement for MAX1292BCEG+T. |
Compared with MAX1292ACEG+, the MAX1292BCEG+T trades guaranteed linearity for lower cost and adequate performance in commercial-temperature industrial systems; versus ADS7822U, it delivers 4× resolution, 2× speed, integrated reference, and parallel interface - making it suitable for higher-fidelity data acquisition where timing determinism matters.
Availability
MAX1292BCEG+T is available at Aetrix Electronics and suitable for industrial process monitoring, portable patient monitors, energy metering subsystems, and resistive touchscreen interfaces requiring stable component supply and long-term production continuity.
Supply support for MAX1292BCEG+T 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 high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX1290/MAX1292 family was designed for low-power, high-accuracy data acquisition in space- and energy-constrained systems - emphasizing integrated references, flexible input configurations, and microcontroller-friendly parallel interfaces.
FAQ
What is the maximum sampling rate of the MAX1292BCEG+T and under what conditions is it achieved?
The MAX1292BCEG+T achieves a maximum sampling rate of 400ksps when operating with an external 7.6MHz clock in internal acquisition mode, VDD = VLOGIC = +5V, and at TA = +25°C. This rate assumes proper bypassing (0.1µF at VDD, 4.7µF at REF), COM referenced to GND, and unipolar single-ended input configuration. At elevated temperatures or reduced supply voltage, the achievable rate may decrease due to timing margin constraints.
Does the MAX1292BCEG+T require an external reference, or does it have an internal one?
The MAX1292BCEG+T includes a precision +2.5V internal bandgap reference, eliminating the need for an external reference in most applications. The REF pin outputs this voltage and must be bypassed with a 4.7µF capacitor to GND. An external reference can be used by connecting REFADJ to VDD and applying the reference voltage to REF - but the internal reference is fully functional and specified for ±20ppm/°C drift and ±100mV initial accuracy.
How many analog input channels does the MAX1292BCEG+T support, and what configurations are available?
The MAX1292BCEG+T supports four single-ended analog inputs (CH0–CH3) or two pseudo-differential pairs (CH0/CH1 and CH2/CH3). Configuration is controlled via the SGL/DIF bit in the 8-bit control byte: SGL/DIF = 1 selects single-ended mode (inputs referenced to COM), and SGL/DIF = 0 selects pseudo-differential mode (voltage difference between paired channels is measured). COM serves as the common-mode reference in both modes.
What power-saving features does the MAX1292BCEG+T offer, and how low does current drop in shutdown?
The MAX1292BCEG+T offers two software-selectable power-down modes: standby (1µA typical) and full shutdown (2µA typical). These are activated via PD0/PD1 bits in the control byte and reduce supply current by cutting bias to the reference, T/H, and digital logic. In shutdown, the device retains register state and wakes in 2µs upon CS assertion - enabling rapid resumption of sampling in duty-cycled sensor systems.
Is the MAX1292BCEG+T pin-compatible with other devices in the MAX1290/MAX1292 family?
The MAX1292BCEG+T is pin-compatible with other 24-pin QSOP variants in the MAX1292 series (e.g., MAX1292ACEG+, MAX1292EEE+), sharing identical pinout, package, and electrical interface. However, it is not pin-compatible with the 28-pin MAX1290 series (8-channel version) or with +3V-only variants like MAX1293 - those use different packages and voltage ranges, requiring PCB redesign for substitution.
MAX1292BCEG+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 2, 4
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1292BCEG+T FAQ
1.How can I place an order for MAX1292BCEG+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1292BCEG+T 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 MAX1292BCEG+T reliable?
The price and inventory of MAX1292BCEG+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1292BCEG+T is usually 5 days.
3.What payment methods are accepted for MAX1292BCEG+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1292BCEG+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1292BCEG+T?
MAX1292BCEG+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1292BCEG+T 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 MAX1292BCEG+T?
For technical support, including MAX1292BCEG+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1292BCEG+T requirements.
6.How does Aetrix verify that MAX1292BCEG+T is sourced from the original manufacturer or authorized distributors?
All MAX1292BCEG+T 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 MAX1292BCEG+T meets industry standards.
7.What is the process for return or replacement of MAX1292BCEG+T?
All MAX1292BCEG+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1292BCEG+T, 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 MAX1292BCEG+T part is unused and in its original packaging.
Return procedure for MAX1292BCEG+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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