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Analog Devices Inc./Maxim Integrated MAX1297ACEG+
- Part No.:
- MAX1297ACEG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1297ACEG+.pdf
- Description:
- IC ADC 12BIT SAR 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,150
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Product details
Overview
MAX1297ACEG+ from Maxim Integrated is a low-power, 12-bit successive-approximation ADC with internal +2.5V reference, 24-pin QSOP package, 2-channel single-ended / 1-channel pseudo-differential analog input configuration, and parallel 12-bit interface. It operates from a single +2.7V to +3.6V supply, achieves 265ksps sampling rate, and consumes only 1.9mA at full speed-ideal for space-constrained, battery-powered patient monitoring and industrial data-logging systems.
For engineers reviewing the MAX1297ACEG+ datasheet, MAX1297ACEG+ pinout, MAX1297ACEG+ application, or MAX1297ACEG+ equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed operating modes (internal/external clock & acquisition), real-world use-value in medical and energy management contexts, and two rigorously cross-checked alternative parts with documented functional and application-level differences.
Technical Context
The MAX1297ACEG+ implements a SAR architecture with integrated track/hold (3MHz full-power bandwidth) and software-configurable analog input multiplexer. Its control byte (D7–D0) directly selects unipolar/bipolar mode, single-ended/pseudo-differential operation, channel address (A2–A0), acquisition mode (ACQMOD), and clock/power-down settings-enabling full configuration without external logic.
It supports two distinct acquisition paths: internal acquisition (timed by on-chip logic, ~1µs hold time in internal clock mode) and external acquisition (user-controlled sampling aperture via dual WR pulses). INT output is actively driven low upon conversion completion and tri-states when CS goes high-ensuring clean microprocessor bus interfacing without contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with ±0.5 LSB INL (max) - ensures monotonicity and <0.012% full-scale error across temperature. |
| Sampling Rate | 265ksps maximum - supports real-time capture of signals up to 132.5kHz Nyquist bandwidth. |
| Analog Supply | +2.7V to +3.6V single supply - eliminates need for dual-rail or LDO sequencing in portable designs. |
| Reference | +2.5V internal bandgap (±20ppm/°C TC) - removes external reference component and layout area; bypass requires 4.7µF at REF pin. |
| Power Consumption | 1.9mA at 265ksps; 2µA in shutdown - enables >1-year battery life in intermittent-sampling sensor nodes. |
| Input Configuration | 2 single-ended or 1 pseudo-differential channel - matches compact sensor arrays (e.g., dual-lead ECG) without external mux. |
| Interface | 12-bit parallel, three-state D0–D11 with CS/WR/RD/INT - direct connection to 8051, ARM Cortex-M GPIO or FPGA I/O banks. |
Pinout & Package
MAX1297ACEG+ is housed in a 24-pin QSOP (0.154" wide) package with 0.635mm lead pitch. Pin functions are electrically validated per Maxim's official pin description table and timing diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0, CH1 | Analog Input Channels | Single-ended inputs referenced to COM; support unipolar (0V to +2.5V) or bipolar (−1.25V to +1.25V) ranges. |
| COM | Analog Ground Reference | Zero-code reference node; must be stable to ±0.5 LSB during conversion-requires low-impedance connection to system AGND. |
| REF | Reference Buffer Output | Delivers +2.5V internal reference; requires 4.7µF ceramic capacitor to GND for stability and noise rejection. |
| REFADJ | Reference Trim Input | Connect to VDD to disable internal reference when using external reference; otherwise bypass with 0.01µF to GND. |
| CS | Active-Low Chip Select | Enables digital interface; forces D0–D11 and INT into high-impedance state when high-prevents bus contention. |
| WR | Active-Low Write Control | Latches 8-bit control byte on rising edge; initiates acquisition/conversion based on ACQMOD bit setting. |
| RD | Active-Low Read Control | Enables parallel data output on falling edge; INT returns high after first RD cycle. |
| CLK | Clock Input | Accepts 100kHz–4.8MHz external clock; tied high/low in internal clock mode to avoid floating input. |
| INT | Interrupt Output | Active-low open-drain signal indicating conversion completion and data readiness; tri-states when CS = high. |
| D0–D11 | Three-State Data Bus | Outputs 12-bit result (unipolar = straight binary, bipolar = two's complement); high-Z when CS = high or during conversion. |
| VDD | Analog Power Supply | +2.7V to +3.6V supply; requires 0.1µF ceramic bypass capacitor close to pin. |
| GND | Analog/Digital Ground | Common return for analog and digital sections; must be connected at single point to minimize noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (2 channels) or pseudo-differential (1 channel) selection via SGL/DIF bit-eliminates external switch ICs in dual-sensor systems. |
| Internal +2.5V reference | ±0.5 LSB linearity contribution over temperature; avoids cost and board space of discrete voltage reference ICs. |
| Two power-down modes | Standby (≤1µA) and full shutdown (≤2µA)-enables ultra-low average current in duty-cycled data loggers. |
| Fast wake-up time | 2µs wake-from-shutdown to first valid conversion-supports responsive event-triggered sampling without latency penalty. |
| Aperture jitter | 50ps typical (external acquisition mode)-preserves SNR >70dB for high-fidelity signal digitization up to 100kHz. |
Applications
| Portable Patient Monitoring | Industrial Energy Meters |
|---|---|
Use Scenario: Dual-lead ECG or blood oxygen saturation (SpO₂) front-end capturing analog biosignals in handheld clinical devices. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; provides interrupt-driven data ready signaling synchronized to µP read cycles. Use Value: 12-bit resolution and ±0.5 LSB INL ensure accurate amplitude tracking of small physiological waveforms; low 1.9mA active current extends AA battery life beyond 18 months. |
Use Scenario: Voltage and current sensing in Class 0.5 smart electricity meters requiring precise RMS calculation under varying load conditions. IC Role / Device Role / Timing Role: High-accuracy sampling engine for metrology ASIC or DSP input; configured in bipolar mode to handle bidirectional current transducer outputs. Use Value: Internal +2.5V reference with ±20ppm/°C drift minimizes calibration drift over −25°C to +70°C field operating range; 265ksps supports oversampling for noise reduction. |
| Wireless Sensor Nodes | Automated Test Equipment (ATE) |
Use Scenario: Battery-powered environmental sensors (temperature/humidity/pressure) transmitting data via BLE or LoRaWAN. IC Role / Device Role / Timing Role: Low-power ADC managing intermittent sampling bursts; enters full shutdown between readings to minimize quiescent draw. Use Value: 2µA shutdown current and 2µs wake-up enable sub-µA average system current; parallel interface reduces µC firmware overhead vs. SPI/I²C alternatives. |
Use Scenario: Modular ATE slot card digitizing analog stimulus responses in production test fixtures for automotive ECUs. IC Role / Device Role / Timing Role: High-speed data acquisition stage with deterministic timing; uses external acquisition mode for precise aperture control aligned to stimulus edges. Use Value: 50ps aperture jitter and 3MHz full-power bandwidth preserve signal integrity for fast transient capture; 24-pin QSOP allows dense PCB layout in multi-channel modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit parallel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1296ACEG+ | +5V supply only; identical pinout, same 2-channel configuration, but lacks internal reference (requires external 2.5V ref). | Suitable for legacy +5V systems where internal reference is unnecessary and board space allows external ref IC. | Select MAX1296ACEG+ only if existing design uses +5V rails and external reference is already present; not drop-in compatible due to supply voltage mismatch. |
| ADS7822U | 8-pin SOIC, SPI interface, 200ksps max, no internal reference, 2.7V–5.25V supply; smaller footprint but serial interface increases µC overhead. | Better for space-constrained, low-pin-count designs where SPI is preferred and lower throughput is acceptable. | Choose ADS7822U when board area is critical and µC has SPI resources; avoid if parallel bus timing or 265ksps throughput is required. |
Compared with MAX1297ACEG+, MAX1296ACEG+ demands +5V operation and external reference-increasing BOM count and limiting modern low-voltage systems-while ADS7822U trades parallel speed and internal reference for size and interface flexibility, making it unsuitable for interrupt-driven, high-throughput embedded control loops.
Availability
MAX1297ACEG+ is available at Aetrix Electronics and suitable for portable medical devices, industrial energy meters, wireless sensor nodes, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1297ACEG+ 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 power management ICs for industrial, medical, and communications applications.
The MAX1295/MAX1297 family was designed specifically for low-power, space-constrained data acquisition systems requiring integrated reference, parallel interface, and flexible input configuration-targeting battery-operated instrumentation and embedded sensor interfaces.
FAQ
What is the maximum sampling rate of the MAX1297ACEG+ and under what conditions is it achieved?
The MAX1297ACEG+ achieves a maximum sampling rate of 265ksps when operating with an external 4.8MHz clock, +3V supply, and internal acquisition mode. This rate assumes full-power operation with the internal +2.5V reference enabled and unipolar single-ended input configuration. At lower clock frequencies or in power-down modes, the effective sampling rate decreases proportionally.
Does the MAX1297ACEG+ require external components for stable operation, and if so, which ones?
Yes, the MAX1297ACEG+ requires three mandatory external components: a 0.1µF ceramic capacitor from VDD to GND, a 4.7µF capacitor from REF to GND (for internal reference use), and a 0.01µF capacitor from REFADJ to GND. These ensure supply decoupling, reference stability, and bandgap buffer performance-omitting any compromises INL, PSRR, or startup reliability.
How does the MAX1297ACEG+ handle bipolar versus unipolar input modes, and what is the impact on output data format?
The MAX1297ACEG+ selects input range via the UNI/BIP bit in its control byte: unipolar mode accepts 0V to +2.5V inputs and outputs straight binary (0x000 to 0xFFF); bipolar mode accepts −1.25V to +1.25V inputs and outputs two's complement (0x800 = −1.25V, 0x000 = 0V, 0x7FF = +1.249V). The COM pin sets the zero-reference point in both modes.
Can the MAX1297ACEG+ be used with an external reference, and how is that configured?
Yes, the MAX1297ACEG+ supports external references applied to the REF pin. To enable this, connect REFADJ to VDD-this disables the internal bandgap reference. The external reference must be stable, low-noise, and capable of driving the REF pin capacitance (4.7µF). Using an external reference improves absolute accuracy and temperature drift beyond the internal ±20ppm/°C specification.
What is the function of the INT pin on the MAX1297ACEG+, and how does it behave during read operations?
The INT pin on the MAX1297ACEG+ is an active-low interrupt output that goes low when conversion completes and output data is valid on D0–D11. It returns high on the first falling edge of RD (read strobe) or when a new control byte is written. When CS is high, INT tri-states-preventing bus conflicts in multi-device systems. This behavior is confirmed in Figures 4 and 5 of the official datasheet.
MAX1297ACEG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SSOP (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 265k
- Number of Inputs:
- 1, 2
- 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:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 24-QSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1297ACEG+ FAQ
1.How can I place an order for MAX1297ACEG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1297ACEG+ 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 MAX1297ACEG+ reliable?
The price and inventory of MAX1297ACEG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1297ACEG+ is usually 5 days.
3.What payment methods are accepted for MAX1297ACEG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1297ACEG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1297ACEG+?
MAX1297ACEG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1297ACEG+ 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 MAX1297ACEG+?
For technical support, including MAX1297ACEG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1297ACEG+ requirements.
6.How does Aetrix verify that MAX1297ACEG+ is sourced from the original manufacturer or authorized distributors?
All MAX1297ACEG+ 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 MAX1297ACEG+ meets industry standards.
7.What is the process for return or replacement of MAX1297ACEG+?
All MAX1297ACEG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1297ACEG+, 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 MAX1297ACEG+ part is unused and in its original packaging.
Return procedure for MAX1297ACEG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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