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Analog Devices Inc./Maxim Integrated MAX1293ACEG+
- Part No.:
- MAX1293ACEG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1293ACEG+.pdf
- Description:
- IC ADC 12BIT SAR 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,720
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Product details
Overview
MAX1293ACEG+ from Maxim Integrated is a 12-bit, 250ksps successive-approximation ADC with integrated +2.5V reference, software-configurable 4-channel single-ended / 2-channel pseudo-differential analog input multiplexer, and byte-wide parallel (8+4) interface. It operates from a single +3V analog supply and supports digital logic levels from +1.8V to +3.6V via VLOGIC, enabling direct interfacing with low-voltage microcontrollers in portable data-acquisition systems.
For engineers reviewing the MAX1293ACEG+ datasheet, MAX1293ACEG+ pinout, MAX1293ACEG+ application, or MAX1293ACEG+ equivalent, this page delivers verified electrical specs, validated package mapping (24-pin QSOP), confirmed timing behavior (3.6µs conversion time, 2µs wake-up), and real-world design context for battery-powered industrial sensing and patient monitoring circuits.
Technical Context
The MAX1293ACEG+ implements a charge-redistribution SAR architecture with an internal track/hold stage offering 3MHz full-power bandwidth and 250kHz full-linear bandwidth. Its control byte (D7–D0) configures acquisition mode (internal/external), clock source (internal/external), unipolar/bipolar range, and single-ended/pseudo-differential input selection - all without external components.
It features dual power-down modes (standby: 10µA; full shutdown: 2µA), tri-state INT output synchronized to CS, and HBEN-controlled 12-bit data bus multiplexing (D0–D7 for LSBs, D0/D8–D3/D11 for MSBs). The on-chip +2.5V bandgap reference exhibits ±2.0ppm/°C drift and 2.49V–2.51V output tolerance over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes over temperature - ensures monotonicity in closed-loop control feedback paths. |
| Sampling Rate | 250ksps maximum - supports real-time capture of 125kHz sine-wave inputs with >67dB SINAD. |
| Analog Input Channels | 4 single-ended or 2 pseudo-differential channels - matches sensor count in compact multi-signal monitoring nodes. |
| Reference | +2.5V internal bandgap (±0.5 LSB INL, ±2.0ppm/°C TC) - eliminates external reference IC and reduces BOM count. |
| Power Consumption | 1.9mA at 250ksps (5.7mW), 2µA in shutdown - enables >1-year battery life in intermittent-sampling IoT endpoints. |
| Digital Interface | Byte-wide parallel (8+4) with HBEN multiplexing and tri-state INT - interfaces directly with 8-bit µP data buses without glue logic. |
| Supply Range | VDD = +2.7V to +3.6V; VLOGIC = +1.8V to +3.6V - supports mixed-voltage system integration with modern low-power MCUs. |
Pinout & Package
MAX1293ACEG+ is housed in a 24-pin QSOP (5.0mm × 7.5mm, 0.635mm pitch) with exposed pad for thermal enhancement. Pin functions are electrically validated per Maxim's official datasheet Rev 3 (12/02).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 HBEN | High-byte enable control | Selects MSB (D8–D11) or LSB (D0–D7) output on shared data bus - enables 8-bit µP compatibility without data widening. |
| 2–5 D7–D4 | Three-state digital I/O | LSB data outputs (HBEN=0) or high-impedance during MSB read - prevents bus contention in multiprocessor systems. |
| 6–9 D3/D11–D0/D8 | Time-multiplexed data I/O | Delivers 12-bit result across 8 pins using HBEN strobe - reduces PCB trace count vs. full 12-bit parallel interface. |
| 10 INT | Open-drain interrupt output | Active-low pulse signals conversion completion; tri-states when CS is high - simplifies µP interrupt routing and sharing. |
| 11 RD | Active-low read strobe | Enables data bus output only when CS and RD are both low - ensures deterministic read timing in synchronous bus protocols. |
| 12 WR | Active-low write strobe | Latches control byte and triggers acquisition/conversion - supports both internal (single-pulse) and external (dual-pulse) sampling control. |
| 13 CLK | Clock input or mode select | Accepts 100kHz–4.8MHz external clock; tied high/low for internal clock mode - decouples timing control from host processor. |
| 14 CS | Active-low chip select | Disables digital outputs (INT, D7–D0) and disables WR/RD inputs when high - enables multi-device bus sharing. |
| 15–18 CH3–CH0 | Analog input channels | Four single-ended inputs referenced to COM; configurable as two pseudo-differential pairs (CH0/CH1, CH2/CH3) - supports differential noise rejection in EMI-prone environments. |
| 19 COM | Analog common reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion - requires low-noise local ground plane. |
| 20 GND | Analog/digital common ground | Single-point connection for AGND and DGND - minimizes ground bounce between analog and digital sections. |
| 21 REFADJ | Bandgap reference buffer input | Connect to VDD to disable internal reference when using external REF - enables precision external reference substitution. |
| 22 REF | Reference output/input | Supplies +2.5V internal reference (bypassed with 4.7µF) or accepts external reference - sets full-scale range and defines LSB weight (610µV). |
| 23 VDD | +3V analog supply | Powers analog core, T/H, and reference; bypassed with 0.1µF ceramic - critical for maintaining SNR >67dB. |
| 24 VLOGIC | +1.8V to +3.6V digital supply | Controls output voltage levels and logic thresholds independently of VDD - allows interfacing with 1.8V, 2.5V, or 3.3V µPs without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Runtime-selectable unipolar/bipolar and single-ended/pseudo-differential modes via control byte - eliminates hardware rework for sensor signal polarity changes. |
| Low-power operation with fast wake-up | 2µs wake-up from shutdown and 10µA standby current - enables microsecond-level responsiveness in duty-cycled measurement systems. |
| Integrated reference with tight drift | +2.5V output with ±2.0ppm/°C tempco and ±0.5 LSB INL - achieves <±0.1% total unadjusted error without calibration in 0°C to +70°C industrial environments. |
| Flexible clocking architecture | Selectable internal (3.6µs conv.) or external (100kHz–4.8MHz) clock - balances µP resource load vs. timing precision requirements. |
| Small-footprint QSOP package | 24-pin QSOP (7.5mm × 5.0mm) with standard 0.635mm pitch - fits high-density PCB layouts in space-constrained medical and portable instrumentation. |
Applications
| Industrial Sensor Node | Patient Vital Sign Monitor |
|---|---|
Use Scenario: Continuous acquisition of temperature, pressure, and humidity sensor outputs in factory-floor wireless nodes. IC Role / Device Role / Timing Role: Primary 12-bit data converter capturing four analog sensor channels at 10ksps with automatic power cycling between readings. Use Value: 400µA operating current at 10ksps extends AA battery life beyond 2 years; internal reference eliminates calibration drift across 0°C–70°C ambient range. |
Use Scenario: Multi-parameter bedside monitor acquiring ECG, SpO₂, and respiration waveforms. IC Role / Device Role / Timing Role: Front-end ADC for analog front-end (AFE) channel multiplexing, supporting both single-ended biopotential inputs and pseudo-differential SpO₂ LED drive feedback. Use Value: 250ksps sampling captures 125kHz transients; ±0.5 LSB INL ensures accurate amplitude tracking of low-amplitude physiological signals. |
| Energy Meter Data Logger | Portable Test Equipment |
Use Scenario: Battery-powered energy meter recording voltage/current waveforms for harmonic analysis and power quality reporting. IC Role / Device Role / Timing Role: High-fidelity digitizer for isolated voltage and current transformer secondaries, operating in bipolar mode with ±1.25V full-scale range. Use Value: 3MHz full-power bandwidth enables undersampling of 50/60Hz fundamentals plus 25th harmonics; internal reference ensures consistent gain accuracy across meter fleet. |
Use Scenario: Handheld multimeter or oscilloscope probe interface capturing DC/AC signals up to 250ksps. IC Role / Device Role / Timing Role: Core ADC in portable instrument front-end, leveraging HBEN multiplexing to fit 12-bit resolution into 8-bit µP data bus. Use Value: 24-pin QSOP footprint minimizes PCB area; VLOGIC support for +1.8V logic enables direct connection to ultra-low-power ARM Cortex-M0+ processors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, SPI interface, no internal reference, 200ksps max rate | Lower resolution and serial interface require µP firmware overhead; lacks integrated reference and bipolar support | Choose for cost-sensitive, lower-accuracy applications where SPI bus availability outweighs parallel simplicity. |
| MAX11100ETE+ | 16-bit resolution, 500ksps, internal 4.096V reference, 16-pin TQFN | Higher resolution and speed but larger code size, higher power (3.5mA), and different pinout prevent drop-in replacement | Choose when 16-bit precision and 500ksps throughput justify redesign for enhanced dynamic range in vibration analysis. |
Compared with ADS7822U and MAX11100ETE+, the MAX1293ACEG+ uniquely balances 12-bit accuracy, parallel interface simplicity, integrated +2.5V reference, and ultra-low 1.9mA active current - making it optimal for space- and power-constrained 4-channel data loggers requiring minimal µP intervention.
Availability
MAX1293ACEG+ is available at Aetrix Electronics and suitable for industrial sensor nodes, patient vital sign monitors, energy meter data loggers, and portable test equipment requiring stable component supply across extended production lifecycles.
Supply support for MAX1293ACEG+ 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) designs precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications - emphasizing integration, reliability, and low-power operation.
The MAX1293ACEG+ belongs to Maxim's low-power SAR ADC product line, engineered specifically for battery-operated data-acquisition systems demanding high resolution, small size, and minimal external components in harsh thermal environments.
FAQ
What is the operating temperature range for MAX1293ACEG+?
The MAX1293ACEG+ is specified for commercial-grade operation from 0°C to +70°C, as indicated by the 'C' suffix in its ordering code. This range covers typical indoor industrial and medical environments where ambient temperature remains within controlled limits, and the device maintains full performance compliance including ±0.5 LSB INL and 250ksps sampling rate without derating.
Does MAX1293ACEG+ require an external crystal or clock source?
No, MAX1293ACEG+ does not require an external crystal. It includes an internal oscillator that generates a 3MHz clock for conversion timing when configured in internal clock mode (D7=1, D6=0). An external clock (100kHz–4.8MHz) is optional and used only when precise aperture control or synchronization with system clocks is required.
How does the HBEN pin affect data readout on MAX1293ACEG+?
The HBEN pin on MAX1293ACEG+ controls time-multiplexed access to the 12-bit conversion result: when HBEN = 1, D0–D3 output bits D8–D11 (MSBs); when HBEN = 0, D0–D7 output bits D0–D7 (LSBs). This allows full 12-bit resolution to be read using an 8-bit data bus with two consecutive reads, reducing interface complexity versus a dedicated 12-bit bus.
Can MAX1293ACEG+ operate with a 1.8V digital supply while using a 3V analog supply?
Yes, MAX1293ACEG+ supports independent supplies: VDD = +2.7V to +3.6V powers the analog section, while VLOGIC = +1.8V to +3.6V powers the digital I/O. This allows direct interfacing with 1.8V microcontrollers without level shifters, provided VLOGIC ≥ 1.8V and meets VIH/VIL thresholds per the datasheet's logic-level tables.
What is the purpose of the COM pin on MAX1293ACEG+?
The COM pin on MAX1293ACEG+ serves as the analog input reference point: in single-ended mode, it sets the zero-code voltage (typically tied to system analog ground); in pseudo-differential mode, it is unused and left floating. Stability of COM to ±0.5 LSB during conversion is mandatory for specified INL performance, requiring a low-impedance, low-noise local ground connection.
MAX1293ACEG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 250k
- 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.8V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1293ACEG+ FAQ
1.How can I place an order for MAX1293ACEG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1293ACEG+ 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 MAX1293ACEG+ reliable?
The price and inventory of MAX1293ACEG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1293ACEG+ is usually 5 days.
3.What payment methods are accepted for MAX1293ACEG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1293ACEG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1293ACEG+?
MAX1293ACEG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1293ACEG+ 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 MAX1293ACEG+?
For technical support, including MAX1293ACEG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1293ACEG+ requirements.
6.How does Aetrix verify that MAX1293ACEG+ is sourced from the original manufacturer or authorized distributors?
All MAX1293ACEG+ 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 MAX1293ACEG+ meets industry standards.
7.What is the process for return or replacement of MAX1293ACEG+?
All MAX1293ACEG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1293ACEG+, 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 MAX1293ACEG+ part is unused and in its original packaging.
Return procedure for MAX1293ACEG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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