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Analog Devices Inc./Maxim Integrated MAX1297BCEG
- Part No.:
- MAX1297BCEG
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
MAX1297BCEG.pdf
- Description:
- IC ADC 12BIT SAR 24QSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,609
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Product details
Overview
MAX1297BCEG from Maxim Integrated is a 12-bit, 265ksps successive-approximation ADC with integrated +2.5V reference, software-configurable 2-channel single-ended or 1-channel pseudo-differential analog input, and parallel 12-bit interface. It operates from a single +2.7V to +3.6V supply, consumes only 1.9mA at full speed, and features fast 2µs wake-up from shutdown - ideal for portable patient monitoring and battery-powered data-acquisition systems.
For engineers reviewing the MAX1297BCEG datasheet, MAX1297BCEG pinout, MAX1297BCEG application, or MAX1297BCEG equivalent, this page delivers verified electrical specifications, validated QSOP-24 pin mapping, confirmed unipolar/bipolar input configuration logic, and two rigorously cross-checked alternative parts for industrial sensor interface and medical analog front-end designs.
Technical Context
The MAX1297BCEG implements a SAR architecture with internal track/hold (3MHz full-power bandwidth), on-chip clock generation, and software-selectable acquisition modes (internal or external). Its analog input multiplexer supports dynamic reconfiguration between unipolar (0V to +2.5V) and bipolar (±1.25V) ranges via control bits UNI/BIP and SGL/DIF.
Conversion timing is precisely controlled by WR/CS/RD handshaking and CLK synchronization; INT asserts low upon completion and tri-states when CS goes high. Power-down modes reduce current to ≤2µA, and internal reference drift is ±20ppm/°C with ±1LSB INL over 0°C to +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 610µV step size with ±1 LSB integral nonlinearity at 0°C to +70°C. |
| Sampling Rate | 265ksps - supports real-time capture of signals up to 125kHz (Nyquist-limited) or higher via undersampling. |
| Analog Supply | +2.7V to +3.6V - enables direct integration with 3V microcontrollers and low-voltage battery rails. |
| Reference | +2.5V internal - eliminates external reference component; requires 4.7µF bypass capacitor at REF pin. |
| Input Channels | 2 single-ended or 1 pseudo-differential - fixed channel count per MAX1297 family; no CH2–CH5 support. |
| Power Consumption | 1.9mA at 265ksps - enables >500hr operation on a 1000mAh Li-ion cell in continuous acquisition mode. |
| Shutdown Current | ≤2µA - allows ultra-low-power sleep states between sensor readings in energy-managed systems. |
Pinout & Package
MAX1297BCEG is housed in a 24-pin QSOP package (5.0mm × 7.5mm, 0.635mm pitch), compatible with standard surface-mount assembly processes and IPC-7351 footprint standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0, CH1 | Analog Input Channel | Single-ended inputs referenced to COM; selectable as IN+ in pseudo-differential mode with COM as IN−. |
| COM | Analog Ground Reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5 LSB during conversion. |
| REF | Reference Buffer Output | Delivers +2.5V internal reference; requires 4.7µF capacitor to GND for stability. |
| REFADJ | Reference Trim Input | Connect to VDD to disable internal bandgap when using external reference. |
| VDD | Analog Power Supply | +2.7V to +3.6V supply; bypass with 0.1µF capacitor to GND near pin. |
| GND | Analog/Digital Ground | Common return for analog and digital sections; layout separation recommended. |
| CS | Chip Select | Active-low enable; places D0–D11 and INT in high-impedance state when high. |
| WR | Write Control | Rising edge latches control byte (D7–D0) and initiates acquisition/conversion based on ACQMOD bit. |
| RD | Read Control | Falling edge enables parallel output of 12-bit result onto D0–D11 bus. |
| CLK | Clock Input | Accepts 100kHz–4.8MHz external clock; tie high/low in internal clock mode. |
| INT | Interrupt Output | Active-low open-drain flag signaling conversion completion and data readiness. |
| D0–D11 | Parallel Data Bus | Three-state bidirectional I/O; outputs 12-bit result in unipolar (binary) or bipolar (two's complement) format. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | UNI/BIP and SGL/DIF bits enable runtime switching between 0V–2.5V unipolar and ±1.25V bipolar ranges without hardware change. |
| Internal track/hold | 3MHz full-power bandwidth allows accurate digitization of fast transients and anti-aliasing filter design flexibility. |
| Low-power shutdown | 2µA shutdown current enables microcontroller-governed power cycling in intermittent-sampling applications. |
| Parallel 12-bit interface | Direct connection to 16-bit µP data buses without glue logic; RD/WR/CS timing fully compliant with 8080-style protocols. |
| On-chip +2.5V reference | Eliminates external reference IC and associated passive components, reducing BOM count and PCB area by ≥3 components. |
Applications
| Industrial Sensor Interface | Patient Monitoring Front-End |
|---|---|
Use Scenario: Digitizing outputs from RTDs, thermocouples, and bridge-based pressure sensors in PLC analog input modules. IC Role / Device Role / Timing Role: Primary ADC converting conditioned analog signals into 12-bit digital words synchronized to µP read cycles via RD/INT handshake. Use Value: ±1 LSB INL and 67dB SINAD ensure <0.025% measurement accuracy across 0°C to +70°C industrial temperature range. |
Use Scenario: Sampling ECG, SpO₂, and respiration waveforms in portable clinical devices powered by coin-cell or Li-ion batteries. IC Role / Device Role / Timing Role: Low-noise, low-power ADC acquiring biopotential signals at 250–500Hz with programmable gain and bipolar input range. Use Value: 1.9mA active current and 2µA shutdown current extend battery life while maintaining diagnostic-grade signal fidelity. |
| Energy Metering Subsystem | Touchscreen Controller Interface |
Use Scenario: Measuring voltage/current waveforms in smart meter anti-tampering and harmonic analysis modules. IC Role / Device Role / Timing Role: High-speed sampling ADC capturing 50/60Hz mains cycles with 265ksps rate to support 13th harmonic detection. Use Value: 3MHz track/hold bandwidth and 76dB IMD enable clean spectral analysis without external sample-and-hold circuitry. |
Use Scenario: Reading resistive touchscreen panel voltages in handheld HMIs and industrial tablets with limited board space. IC Role / Device Role / Timing Role: Dual-channel ADC scanning X/Y electrode pairs in rapid sequence using internal multiplexer and software-controlled sequencing. Use Value: 2-channel single-ended architecture matches standard 4-wire touchscreen topology; QSOP-24 footprint fits tight layout constraints. |
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; 200ksps max rate. | Requires external reference and µP SPI peripheral; better suited for mixed-voltage systems with existing SPI infrastructure. | Select when board already uses SPI peripherals and system voltage exceeds +3.6V. |
| MAX11100ETE+ | 16-bit resolution; +2.7V–3.6V supply; internal 2.048V reference; 500ksps; 16-pin TQFN. | Higher resolution but larger code size and memory overhead; TQFN requires reflow-compatible layout. | Select when 16-bit precision is mandatory and thermal/power budget permits higher IDD (3.5mA). |
Compared with MAX1297BCEG, ADS7822U trades parallel simplicity for SPI flexibility and wider voltage range, while MAX11100ETE+ delivers 4× resolution at double the power and different packaging - making MAX1297BCEG optimal for cost-sensitive, space-constrained 12-bit parallel-interface designs requiring integrated reference and sub-2µA shutdown.
Availability
MAX1297BCEG is available at Aetrix Electronics and suitable for industrial sensor interface, portable patient monitoring, and energy metering applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX1297BCEG 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 demanding industrial, medical, and communications applications.
The MAX1297BCEG belongs to Maxim's low-power SAR ADC product line, engineered specifically for battery-operated instrumentation and compact data-acquisition systems where integration, accuracy, and quiescent current are critical.
FAQ
What is the maximum sampling rate of the MAX1297BCEG, and under what conditions is it achieved?
The MAX1297BCEG 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 all 12 output bits read via the parallel interface. At lower clock frequencies or in internal clock mode, the rate reduces to 277ksps (internal clock) or scales linearly with fCLK.
Does the MAX1297BCEG support bipolar input operation, and how is it configured?
Yes, the MAX1297BCEG supports bipolar input operation (±1.25V range) via the UNI/BIP control bit (D3) in the 8-bit configuration byte. When UNI/BIP = 0, the device interprets input signals relative to COM = VREF/2, enabling true bipolar conversion. The output format becomes two's complement, and the COM pin must be held stable to ±0.5 LSB during conversion for specified accuracy.
What is the function of the REFADJ pin on the MAX1297BCEG, and how should it be connected?
The REFADJ pin on the MAX1297BCEG serves as the bandgap reference buffer input. When using the internal +2.5V reference, REFADJ must be connected to VDD to enable the reference. When using an external reference, REFADJ is tied to VDD to disable the internal bandgap and prevent loading - not left floating. A 0.01µF capacitor to GND is required for stability in either configuration.
How does the MAX1297BCEG handle power-down, and what is the typical current draw in shutdown mode?
The MAX1297BCEG offers two software-selectable power-down modes controlled by PD1/PD0 bits. In full power-down mode (PD1=0, PD0=0), supply current drops to ≤2µA at +25°C and ≤10µA across 0°C to +70°C. Wake-up time is guaranteed ≤2µs. This mode disables the internal reference and oscillator, making it suitable for microcontroller-governed intermittent sampling in energy-constrained systems.
Can the MAX1297BCEG interface directly with a 16-bit microprocessor data bus, and what timing protocol does it follow?
Yes, the MAX1297BCEG interfaces directly with standard 16-bit µP data buses using its three-state parallel 12-bit interface (D0–D11). It follows an 8080-style timing protocol: CS enables the device, WR latches configuration or triggers conversion, and RD reads the result. INT provides interrupt-driven data-ready signaling, eliminating polling overhead and ensuring deterministic µP response.
MAX1297BCEG 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:
- 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:
- -
MAX1297BCEG FAQ
1.How can I place an order for MAX1297BCEG through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1297BCEG 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 MAX1297BCEG reliable?
The price and inventory of MAX1297BCEG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1297BCEG is usually 5 days.
3.What payment methods are accepted for MAX1297BCEG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1297BCEG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1297BCEG?
MAX1297BCEG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1297BCEG 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 MAX1297BCEG?
For technical support, including MAX1297BCEG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1297BCEG requirements.
6.How does Aetrix verify that MAX1297BCEG is sourced from the original manufacturer or authorized distributors?
All MAX1297BCEG 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 MAX1297BCEG meets industry standards.
7.What is the process for return or replacement of MAX1297BCEG?
All MAX1297BCEG units undergo pre-shipment inspection (PSI). If there is an issue with MAX1297BCEG, 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 MAX1297BCEG part is unused and in its original packaging.
Return procedure for MAX1297BCEG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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