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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:3,470
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Product details
Overview
MAX1297ACEG from Maxim Integrated is a 12-bit, 265ksps successive-approximation ADC with internal +2.5V reference, software-configurable 2-channel single-ended or 1-channel pseudo-differential analog input, +2.7V to +3.6V single-supply operation, and parallel 12-bit interface - designed for low-power data-acquisition systems including patient monitoring and energy management.
For engineers reviewing the MAX1297ACEG datasheet, MAX1297ACEG pinout, MAX1297ACEG application, or MAX1297ACEG equivalent, this page delivers verified electrical specs, validated QSOP-24 pin functions, confirmed timing behavior (tCONV = 3.3µs), and real-world substitution guidance for battery-powered embedded designs requiring <2µA shutdown current and ±0.5 LSB INL.
Technical Context
The MAX1297ACEG implements a SAR architecture with integrated track/hold (3MHz full-power bandwidth), internal bandgap reference (±20ppm/°C TCREF), and configurable acquisition mode (internal or external). It supports unipolar/bipolar input ranges via software control bits UNI/BIP and SGL/DIF.
Its parallel interface uses active-low CS, WR, and RD with tri-statable D0–D11 outputs and open-drain INT output. Conversion is initiated by a control byte (8-bit) that selects channel (A2–A0), input mode, clock source, and power-down state - all latched on WR rising edge in internal acquisition mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 1 LSB = VREF/4096 quantization step for precise measurement of small signal changes. |
| Sampling Rate | 265ksps maximum - supports real-time capture of signals up to ~132kHz Nyquist bandwidth. |
| INL / DNL | ±0.5 LSB / ±1 LSB - ensures monotonicity and <0.012% integral error across full temperature range (0°C to +70°C). |
| Supply Current | 1.9mA at 265ksps (internal ref), 2µA in shutdown - enables >1-year battery life in intermittent-sampling applications. |
| Reference | +2.5V internal (±100mV initial accuracy, ±20ppm/°C drift) - eliminates external reference component and layout area. |
| Analog Input | 2 single-ended or 1 pseudo-differential channel - reduces multiplexer complexity vs. 6-channel MAX1295 while maintaining noise immunity in differential mode. |
| Package | 24-pin QSOP - 8.7mm × 3.9mm footprint compatible with automated SMT assembly and space-constrained PCBs. |
Pinout & Package
MAX1297ACEG is housed in a 24-pin QSOP package with exposed pad (not thermally enhanced), rated for 0°C to +70°C operation. Pin pitch is 0.65mm; body width is 3.9mm.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | D9 | Three-state digital output - carries bit 9 of 12-bit conversion result; high-impedance when CS = high. |
| 2 | D8 | Three-state digital output - carries bit 8; synchronized to RD falling edge with tDO = 20–70ns delay. |
| 3 | D7 | Three-state digital I/O - bidirectional; latches control byte during WR pulse in internal acquisition mode. |
| 4 | D6 | Three-state digital I/O - control bit D6 selects external clock mode (D6=D7=1) or internal clock mode (D7=1, D6=0). |
| 5 | D5 | Three-state digital I/O - PD1 bit; sets power-down mode (00 = full power-down, 01 = standby, 11 = normal). |
| 6 | D4 | Three-state digital I/O - SGL/DIF bit; configures analog input as single-ended (1) or pseudo-differential (0). |
| 7 | D3 | Three-state digital I/O - UNI/BIP bit; selects unipolar (1: 0V to VREF) or bipolar (0: –VREF/2 to +VREF/2) input range. |
| 8 | D2 | Three-state digital I/O - A2 address bit; selects among CH0, CH1, or COM in single-ended/pseudo-diff modes. |
| 9 | D1 | Three-state digital I/O - A1 address bit; used with A2/A0 to decode channel selection per Table 2/3. |
| 10 | D0 | Three-state digital I/O - A0 address bit; completes 3-bit channel address for 2-channel operation. |
| 11 | INT | Open-drain interrupt output - goes low when conversion completes and data is valid; tri-states when CS = high. |
| 12 | RD | Active-low read strobe - enables output drivers; falling edge samples D0–D11 and clears INT if previously asserted. |
| 13 | WR | Active-low write strobe - rising edge latches control byte and initiates acquisition/conversion sequence. |
| 14 | CLK | Clock input - driven externally (100kHz–4.8MHz) or tied high/low in internal clock mode (4.8MHz typical). |
| 15 | CS | Active-low chip select - disables all digital outputs and inputs when high; required for bus sharing. |
| 16 | CH1 | Analog input channel 1 - positive input in single-ended mode; paired with CH0 in pseudo-differential mode. |
| 17 | CH0 | Analog input channel 0 - primary input; selected by A2–A0 = 000 in single-ended mode. |
| 18 | COM | Common-mode reference - sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB during conversion. |
| 19 | GND | Analog/digital ground - single-point connection recommended to minimize noise coupling between domains. |
| 20 | REFADJ | Reference buffer input - connect to VDD to disable internal bandgap when using external reference. |
| 21 | REF | Reference buffer output/input - supplies +2.5V (internal) or accepts external reference; bypass with 4.7µF capacitor. |
| 22 | VDD | +2.7V to +3.6V analog supply - powers core ADC, reference, and interface; bypass with 0.1µF ceramic capacitor. |
| 23 | D10 | Three-state digital output - carries bit 10; valid after RD falling edge with tDO2 = 110ns max CS-to-data delay. |
| 24 | D11 | Three-state digital output - carries MSB (bit 11); completes 12-bit parallel word aligned with D0–D9. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input topology | Single-ended (2 channels) or pseudo-differential (1 channel) selection via SGL/DIF bit - eliminates need for external op-amp circuitry in noise-sensitive measurements. |
| Internal +2.5V reference | ±100mV initial accuracy, ±20ppm/°C drift, 4.7µF bypass - removes external reference IC, saves BOM cost and board space. |
| Low-power operation | 1.9mA at 265ksps, 400µA at 10ksps, 2µA shutdown - extends battery life in portable medical and industrial logging devices. |
| Fast wake-up | 2µs wake-from-shutdown time - enables rapid sampling bursts without sacrificing average power budget. |
| Parallel 12-bit interface | Tri-state D0–D11, active-low CS/WR/RD, open-drain INT - directly interfaces to 8051, ARM Cortex-M, or FPGA GPIO without level shifters. |
Applications
| Patient Monitoring | Energy Management |
|---|---|
Use Scenario: Continuous acquisition of ECG, SpO₂, or respiration signals in portable clinical devices with 24-hour battery life. IC Role / Device Role / Timing Role: Primary ADC digitizing analog front-end outputs; provides 12-bit resolution at ≤10ksps with <2µA quiescent current between samples. Use Value: Enables compact, low-noise design with no external reference or clock generator - reducing system BOM by ≥3 components. |
Use Scenario: Real-time voltage/current sensing in smart meters and solar inverters operating from lithium or supercapacitor backup. IC Role / Device Role / Timing Role: High-accuracy analog input conditioner for metrology-grade sampling; supports bipolar input for AC waveform capture. Use Value: ±0.5 LSB INL and 67dB SINAD ensure Class 0.5 metering compliance without calibration overhead. |
| Industrial Data Logging | Touchscreen Controller Interface |
Use Scenario: Battery-powered environmental sensor nodes measuring temperature, humidity, and pressure over multi-year deployments. IC Role / Device Role / Timing Role: Low-duty-cycle ADC triggered by microcontroller wake-up events; enters 2µA shutdown between readings. Use Value: 2µA shutdown current and fast 2µs wake-up allow >5-year operation on CR2032 coin cell at one reading per minute. |
Use Scenario: Resistive touchscreen digitizer in handheld HMI panels where space and power are constrained. IC Role / Device Role / Timing Role: Dual-channel ADC sampling X/Y electrode voltages; pseudo-differential mode rejects common-mode noise from display switching. Use Value: Built-in COM reference and software-selectable input mode eliminate external op-amps and reduce layout sensitivity to EMI. |
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-pin SOIC, SPI interface, 200ksps, external reference only, no internal T/H | Requires external op-amp for signal conditioning; lacks pseudo-differential mode and internal reference | Select when board space is critical and SPI interface is preferred over parallel; verify external T/H meets 3MHz BW requirement. |
| MAX11100ETE+ | 16-pin TQFN, SPI interface, 500ksps, internal 2.048V reference, 10ppm/°C TC | Higher resolution and speed but no parallel interface; smaller package requires rework for existing layouts | Choose for higher precision (16-bit) and lower drift in new designs where SPI is acceptable and layout revision is feasible. |
Compared with MAX1297ACEG, ADS7822U offers smaller footprint but demands external signal conditioning and lacks integrated reference, while MAX11100ETE+ delivers superior accuracy and lower drift at the cost of interface compatibility and pin count - making MAX1297ACEG optimal for legacy parallel-bus systems needing proven low-power 12-bit performance in QSOP-24.
Availability
MAX1297ACEG is available at Aetrix Electronics and suitable for patient monitoring, energy management, and industrial data-acquisition systems 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 high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX1295/MAX1297 family was designed specifically for ultra-low-power, space-constrained data-acquisition systems requiring integrated reference, parallel interface, and flexible input configuration - targeting portable instrumentation and battery-operated sensors.
FAQ
What is the maximum sampling rate of the MAX1297ACEG?
The MAX1297ACEG achieves a maximum sampling rate of 265ksps under specified conditions: VDD = +3V, fCLK = 4.8MHz, internal reference enabled, and unipolar single-ended input mode. At this rate, supply current is 1.9mA and conversion time is 3.3µs. Lower sampling rates reduce current consumption - e.g., 400µA at 10ksps - enabling adaptive power management in battery-powered systems using the MAX1297ACEG.
Does the MAX1297ACEG require an external clock source?
No, the MAX1297ACEG supports both internal and external clock modes. In internal clock mode (D7=1, D6=0), it generates its own 4.8MHz clock, eliminating the need for an external oscillator. The CLK pin must be tied high or low to prevent floating. External clock mode (D6=D7=1) accepts 100kHz–4.8MHz TTL/CMOS signals with 30%–70% duty cycle - giving designers flexibility to synchronize conversions with system timing or reduce EMI through clock frequency tuning in the MAX1297ACEG.
How many analog input channels does the MAX1297ACEG support?
The MAX1297ACEG supports two analog input channels (CH0 and CH1) in single-ended mode, or one pseudo-differential pair (CH0/CH1) where the voltage difference is measured. This is distinct from the 6-channel MAX1295. Channel selection is controlled by address bits A2–A0 in the 8-bit control byte; only A1/A0 are used for 2-channel addressing. The COM pin serves as the common-mode reference and must remain stable to ±0.5 LSB during conversion in all modes of the MAX1297ACEG.
What is the purpose of the REFADJ pin on the MAX1297ACEG?
The REFADJ pin on the MAX1297ACEG serves as the bandgap reference buffer input. When using the internal +2.5V reference, REFADJ must be connected to VDD to enable the reference buffer. When using an external reference, REFADJ is connected to VDD to disable the internal bandgap and prevent loading. A 0.01µF capacitor is required between REFADJ and GND for stability. This dual-function pin allows seamless transition between internal and external reference configurations without redesigning the MAX1297ACEG schematic.
Can the MAX1297ACEG operate with a 5V supply?
No, the MAX1297ACEG is specified for +2.7V to +3.6V analog supply (VDD) only. Absolute maximum rating is +6V, but operation outside the 2.7V–3.6V range violates specifications and risks degraded performance or damage. For +5V systems, consider the pin-compatible MAX1296 (5V version of MAX1297) or use a regulated 3.3V supply. The MAX1297ACEG's low-voltage operation is intentional to minimize power consumption in battery-powered applications - a core design goal reflected in its 2µA shutdown current and 1.9mA active current.
MAX1297ACEG 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:
- -
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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