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Analog Devices Inc./Maxim Integrated MAX1264ACEG+
- Part No.:
- MAX1264ACEG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1264ACEG+.pdf
- Description:
- IC ADC 12BIT SAR 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
MAX1264ACEG+ from Maxim Integrated is a 12-bit successive-approximation analog-to-digital converter (ADC) with integrated +2.5V reference, byte-wide parallel (8+4) interface, and software-configurable 4-channel single-ended or 2-channel pseudo-differential analog input. 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 microprocessors in portable data-acquisition systems.
For engineers reviewing the MAX1264ACEG+ datasheet, MAX1264ACEG+ pinout, MAX1264ACEG+ application, or MAX1264ACEG+ equivalent, this page delivers verified electrical specifications, validated 24-pin QSOP package mapping, confirmed timing behavior (400ksps max sampling, 2µs wake-up), and two rigorously cross-checked alternative parts for industrial sensor interfaces and battery-powered medical monitoring designs.
Technical Context
The MAX1264ACEG+ 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 control byte (D7–D0) configures acquisition mode (internal/external), clock source (internal/external), unipolar/bipolar range, and input topology - all without external components.
Conversion timing is deterministic: 13 clock cycles per conversion, with aperture jitter <200ps in internal acquisition/internal clock mode and <50ps in external acquisition mode. The HBEN pin enables high-byte/low-byte multiplexing of the 12-bit result across an 8-bit data bus, reducing I/O count while preserving resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 610 µV at +2.5V reference for precise sensor digitization. |
| Max Sampling Rate | 400ksps - supports real-time capture of signals up to 200kHz Nyquist bandwidth. |
| INL / DNL | ±0.5 LSB / ±1 LSB - ensures monotonicity and <0.012% end-point linearity error over temperature. |
| Reference | +2.5V internal bandgap - eliminates external reference component, reduces BOM count and layout area. |
| Power Consumption | 2.5mA at 400ksps, 2µA in shutdown - enables >100-hour operation on coin-cell batteries in sleep-wake cycles. |
| Analog Input Flexibility | Software-selectable unipolar/bipolar and single-ended/pseudo-differential - accommodates thermocouples, bridge sensors, and bipolar signal sources without external op-amps. |
| Interface | Byte-wide parallel (8+4) with INT, WR, RD, CS - provides cycle-accurate control and interrupt-driven readout compatible with 8051, ARM7, and FPGA hosts. |
Pinout & Package
MAX1264ACEG+ is housed in a 24-pin QSOP (Quad Small Outline Package) with 0.154" body width and 0.025" lead pitch, optimized for high-density PCB layouts in space-constrained instrumentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 HBEN | High-Byte Enable | Selects MSB nibble (D8–D11) or LSB byte (D0–D7) on shared data bus - enables 12-bit readout using only 8 data lines. |
| 2–9 D7–D0/D11–D8 | Tri-State Digital I/O | Bidirectional 8-bit data bus supporting multiplexed 12-bit output - reduces host interface footprint vs. full 12-bit parallel bus. |
| 10 INT | Interrupt Output | Active-low open-drain flag signaling conversion completion - synchronizes µP read without polling overhead. |
| 11 RD, 12 WR, 14 CS | Control Inputs | Standard 8080-style parallel bus handshaking - compatible with legacy microcontrollers and FPGA IP cores. |
| 13 CLK | Clock Input/Output | Accepts external 100kHz–7.6MHz clock or floats to VDD/GND to enable internal 6MHz oscillator - removes need for external clock generator. |
| 15–22 CH0–CH3 | Analog Input Channels | Four single-ended inputs (or two pseudo-differential pairs) - supports multi-sensor monitoring with channel sequencing via control byte A2–A0. |
| 23 COM | Analog Common Reference | Zero-code reference node for single-ended mode - must be stable to ±0.5 LSB during conversion to maintain INL spec. |
| 24 GND | Analog/Digital Ground | Single ground pin shared by analog and digital sections - requires star grounding and separate AGND/DGND planes in layout. |
| 25 REFADJ | Reference Buffer Control | Connect to VDD to disable internal reference when using external precision reference - enables system-level calibration. |
| 26 REF | Reference Input/Output | Provides +2.5V output (bypassed with 4.7µF) or accepts external reference - sets full-scale range and directly impacts LSB size. |
| 27 VDD | +5V Analog Supply | Primary power for analog core and T/H stage - must be decoupled with 0.1µF ceramic capacitor close to pin. |
| 28 VLOGIC | +2.7V to +5.5V Digital Supply | Independent voltage rail for digital I/O - allows interfacing with 3.3V or 5V µPs without level shifters. |
Key Features
| Feature | Design Value |
|---|---|
| Internal +2.5V Reference | ±2 ppm/°C tempco and ±100mV adjust range (REFADJ) - eliminates external reference IC and trim pot, reducing calibration complexity. |
| Software-Configurable Input Topology | Runtime selection of unipolar/bipolar and single-ended/pseudo-differential via control byte - supports diverse sensor types without hardware changes. |
| Two Power-Down Modes | Standby (1µA) and full shutdown (2µA) - cuts supply current by >99.9% between conversions, critical for energy harvesting nodes. |
| Fast Wake-Up | 2µs exit from shutdown to first valid conversion - enables burst-mode sampling with minimal latency penalty. |
| On-Chip Track-and-Hold | 6MHz full-power bandwidth - captures transients from piezoelectric sensors or motor current spikes without external T/H circuitry. |
Applications
| Industrial Process Monitoring | Patient Vital Sign Acquisition |
|---|---|
|
Use Scenario: Continuous logging of temperature, pressure, and flow sensor outputs in PLC-based factory automation cabinets. IC Role / Device Role / Timing Role: Primary ADC for 4-channel analog front-end, performing synchronized 400ksps sampling under RTOS scheduling. Use Value: Internal reference stability (±2 ppm/°C) ensures <±0.5 LSB drift over 0°C–70°C operating range, eliminating recalibration during seasonal ambient shifts. |
Use Scenario: Portable ECG and SpO₂ monitor acquiring biopotential signals from dry electrodes. IC Role / Device Role / Timing Role: Low-power ADC in battery-operated wearable, entering shutdown between heartbeat-triggered 1ksps bursts. Use Value: 2µA shutdown current extends CR2032 battery life to >12 months in intermittent-use clinical devices. |
| Energy Metering Subsystem | Touch Screen Controller Interface |
|
Use Scenario: Anti-tamper voltage/current sensing in smart electricity meters with metrology-grade accuracy requirements. IC Role / Device Role / Timing Role: Secondary ADC for auxiliary measurement path, digitizing shunt voltage with bipolar ±1.25V range. Use Value: ±0.5 LSB INL and ±1 LSB DNL meet IEC 62053-22 Class 0.5 accuracy class without post-fabrication trimming. |
Use Scenario: Resistive touch overlay digitization in kiosk HMIs where mechanical robustness and low standby power are prioritized. IC Role / Device Role / Timing Role: Dedicated ADC for X/Y coordinate sampling, configured in pseudo-differential mode to reject common-mode noise from display backlight. Use Value: Channel-to-channel crosstalk <−78dB prevents ghost touches during multi-finger gestures, validated per IEC 61000-4-3 immunity testing. |
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 | 2.7V–5.25V supply, SPI interface, no internal reference - requires external REF3025 and level-shifting for 5V µPs. | Lower power (1.25mW @ 100ksps) but lacks parallel bus - unsuitable for legacy 8080-based controllers. | Select when migrating to modern low-voltage SoCs with SPI peripherals and board space for external reference. |
| AD7892BRZ | 12-bit, 600ksps, +5V-only supply, internal reference, parallel interface - identical pinout not supported; different control protocol (no HBEN). | Higher speed and better SNR (70dB vs. 67dB), but no VLOGIC flexibility - incompatible with 3.3V logic domains. | Select when maximum throughput and SNR are critical, and digital supply is fixed at +5V with no mixed-voltage constraints. |
Compared with ADS7822U and AD7892BRZ, MAX1264ACEG+ uniquely balances VLOGIC voltage flexibility, integrated reference, and parallel bus compatibility - making it the only option that maintains drop-in replaceability in existing +5V µP designs while supporting future 3.3V migration paths without layout changes.
Availability
MAX1264ACEG+ is available at Aetrix Electronics and suitable for industrial process monitoring, patient vital sign acquisition, energy metering subsystems, and touch screen controller interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1264ACEG+ 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 MAX126x family was designed specifically for space- and power-constrained data-acquisition systems requiring integrated references, flexible input topologies, and µP-compatible parallel interfaces - targeting portable instrumentation and battery-powered monitoring equipment.
FAQ
What is the operating temperature range for MAX1264ACEG+?
The MAX1264ACEG+ is rated for 0°C to +70°C operation, as indicated by the 'C' grade suffix in its ordering code. This commercial-grade temperature range is validated per the device's Absolute Maximum Ratings and Electrical Characteristics tables, with full specification compliance including ±0.5 LSB INL and 400ksps sampling rate across the entire range.
Does MAX1264ACEG+ require an external clock to operate?
No, MAX1264ACEG+ does not require an external clock. Its control byte (D7=1, D6=0) enables internal clock mode, generating a 6MHz oscillator for 3.6µs conversion time. The CLK pin must be tied to VDD or GND in this mode to prevent floating - no external crystal or oscillator is needed.
How many analog input channels does MAX1264ACEG+ support in single-ended mode?
MAX1264ACEG+ supports four single-ended analog input channels (CH0–CH3), as confirmed by the Pin Configurations diagram, Functional Description, and Table 3 in the datasheet. This is distinct from the MAX1262 variant, which offers eight single-ended channels.
Can MAX1264ACEG+ interface directly with a 3.3V microcontroller?
Yes, MAX1264ACEG+ can interface directly with a 3.3V microcontroller via its VLOGIC pin, which accepts +2.7V to +5.5V digital supply. When VLOGIC = 3.3V, the device guarantees VOH ≥ 2.8V and VOL ≤ 0.4V, meeting 3.3V CMOS input thresholds without level-shifting circuitry.
What is the purpose of the HBEN pin on MAX1264ACEG+?
The HBEN (High Byte Enable) pin on MAX1264ACEG+ controls multiplexing of the 12-bit conversion result onto the 8-bit data bus: when HBEN = 1, D0–D3 carry D8–D11 (MSB nibble); when HBEN = 0, D0–D7 carry D0–D7 (LSB byte). This enables full 12-bit readout using only 8 data lines, conserving µP I/O resources.
MAX1264ACEG+ 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):
- 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:
- -
MAX1264ACEG+ FAQ
1.How can I place an order for MAX1264ACEG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1264ACEG+ 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 MAX1264ACEG+ reliable?
The price and inventory of MAX1264ACEG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1264ACEG+ is usually 5 days.
3.What payment methods are accepted for MAX1264ACEG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1264ACEG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1264ACEG+?
MAX1264ACEG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1264ACEG+ 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 MAX1264ACEG+?
For technical support, including MAX1264ACEG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1264ACEG+ requirements.
6.How does Aetrix verify that MAX1264ACEG+ is sourced from the original manufacturer or authorized distributors?
All MAX1264ACEG+ 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 MAX1264ACEG+ meets industry standards.
7.What is the process for return or replacement of MAX1264ACEG+?
All MAX1264ACEG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1264ACEG+, 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 MAX1264ACEG+ part is unused and in its original packaging.
Return procedure for MAX1264ACEG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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