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Analog Devices Inc./Maxim Integrated MAX1245ACAP
- Part No.:
- MAX1245ACAP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1245ACAP.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,761
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Product details
Overview
The MAX1245ACAP from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, software-configurable unipolar/bipolar and single-ended/differential inputs, and SPI/QSPI/MICROWIRE-compatible 4-wire serial interface. It operates from a single +2.375V to +3.3V supply, consumes only 0.8mA at 100ksps, and supports 10µA power-down mode - ideal for portable data loggers and battery-powered medical instruments.
For engineers reviewing the MAX1245ACAP datasheet, MAX1245ACAP pinout, MAX1245ACAP application, or MAX1245ACAP equivalent, this page delivers verified technical context, exact package mapping (20-pin SSOP), confirmed timing behavior (1.5MHz external clock, 7.5µs max conversion time), real-world acquisition constraints (tACQ ≥ 2.0µs), and two validated alternative parts with documented functional trade-offs.
Technical Context
The MAX1245ACAP uses successive-approximation register (SAR) architecture with an internal capacitive DAC and integrated track/hold circuitry. Its analog input stage supports pseudo-differential sampling via CH0–CH7 and COM, with configurable channel selection (8 single-ended or 4 differential pairs) and programmable clock mode (internal 1.5MHz or external up to 1.5MHz).
Conversion control is managed through an 8-bit serial command word defining channel, polarity, input mode, and clock/power-down state. The device features hardware shutdown (SHDN pin), serial strobe output (SSTRB) synchronized to conversion start/end, and three-state DOUT with CS-controlled enable - enabling direct interfacing to TMS320-family DSPs and microcontrollers without glue logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% of full-scale range for precision sensor digitization |
| Sampling Rate | 100ksps - supports real-time monitoring of physiological signals and industrial transducers |
| INL (Max) | ±0.5 LSB - ensures monotonicity and <0.012% absolute linearity error across temperature |
| Supply Current | 0.8mA @ 100ksps; 10µA in power-down - enables >1-year battery life in intermittent-sampling systems |
| Analog Input Range | 0V to VREF (unipolar) or ±VREF/2 (bipolar) - accommodates both ground-referenced and AC-coupled sensor outputs |
| Reference Support | External VREF input (2.048V typical) - allows system-level calibration and ratiometric measurement against stable reference |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - eliminates level-shifting and protocol translation in embedded designs |
Pinout & Package
The MAX1245ACAP is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, occupying 30% less board area than the 20-pin DIP variant. This surface-mount package supports automated assembly and improved thermal performance in compact portable systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Selectable as 8 single-ended or 4 differential pairs; input protection clamps to AGND/VDD ±0.3V |
| COM (Pin 9) | Common-mode reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB for accuracy |
| SHDN (Pin 10) | Three-level shutdown control | Pull low → 10µA shutdown; open → 1.5MHz internal clock; pull high → 225kHz internal clock |
| VREF (Pin 11) | External reference voltage input | Accepts 2.048V reference; input resistance 18kΩ; current draw 82–120µA |
| DOUT (Pin 15) | Serial data output | MSB-first, clocked on SCLK falling edge; high-impedance when CS = high |
| DGND (Pin 14) / AGND (Pin 13) | Digital and analog ground returns | Separate grounds minimize digital noise coupling into analog path; AGND–DGND offset ≤ ±0.3V |
| VDD (Pins 12, 20) | Positive supply | Single +2.375V to +3.3V operation; PSR = ±0.3mV over supply range |
| SCLK (Pin 19) | Serial clock input | Drives data transfer and (in external mode) conversion timing; 40%–60% duty cycle required |
| CS (Pin 18) | Active-low chip select | Enables serial interface; DOUT and SSTRB enter high-Z state when CS = high |
| DIN (Pin 17) | Serial data input | Accepts 8-bit control word on SCLK rising edge; first '1' bit defines MSB of command |
| SSTRB (Pin 16) | Serial strobe output | Signals conversion start/end: low during conversion (internal mode) or one-cycle pulse before MSB (external mode) |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Runtime selection of unipolar/bipolar and single-ended/differential via 8-bit serial command - eliminates hardware rework for multi-sensor platforms |
| Integrated track/hold with 2.25MHz small-signal bandwidth | Eliminates external hold capacitor; supports undersampling of transient events beyond Nyquist limit |
| Three-level SHDN pin | Hardware-triggered 10µA shutdown, plus selectable internal clock frequencies (225kHz/1.5MHz) - optimizes power vs. throughput without firmware overhead |
| Direct TMS320-family DSP interface | SSTRB output synchronized to conversion completion - enables zero-wait-state data capture in real-time signal processing pipelines |
| Low-noise 12-bit SAR architecture | 76dB channel-to-channel crosstalk and -85dB THD - preserves signal integrity in multi-channel ECG and vibration monitoring |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure at 10Hz intervals. IC Role / Device Role / Timing Role: ADC front-end acquiring conditioned analog outputs from multiple sensors via multiplexed inputs; internal clock mode enables deterministic 7.5µs conversion window. Use Value: 10µA shutdown between samples extends AA battery life to >2 years; 0.8mA active current avoids thermal drift in sealed enclosures. |
Use Scenario: Handheld ECG monitor capturing lead-II differential signals with 12-bit resolution and 100ksps sampling. IC Role / Device Role / Timing Role: Precision analog front-end converting amplified biopotential signals; pseudo-differential mode rejects common-mode interference from 50/60Hz mains. Use Value: ±0.5 LSB INL ensures accurate ST-segment analysis; separate AGND/DGND pins suppress digital switching noise from MCU subsystem. |
| Battery-Powered Test Equipment | Industrial Data Acquisition |
Use Scenario: Portable multimeter measuring DC voltage, current, and resistance with autoranging and auto-zero functions. IC Role / Device Role / Timing Role: Core ADC performing calibrated unipolar conversions on shunt voltages and reference-divided inputs; software-selectable VREF scaling maintains 12-bit ENOB across ranges. Use Value: External VREF input enables ratiometric measurements against precision voltage references; 2.048V default reference yields 500µV LSB for µV-level resolution. |
Use Scenario: DIN-rail mounted PLC analog input module digitizing 4–20mA current loops and thermocouple outputs. IC Role / Device Role / Timing Role: Multi-channel acquisition engine supporting simultaneous sampling of 8 isolated sensor inputs; SPI interface integrates with ARM Cortex-M4 host processor. Use Value: 8-channel mux reduces component count versus discrete ADCs; 1.5MHz serial clock supports >10ksps per channel in time-sliced operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX147ACPP | Pin-compatible but rated for +2.7V to +5.25V supply; ±1 LSB INL (vs. ±0.5 LSB for MAX1245ACAP); no internal track/hold | Requires external sample-and-hold for high-frequency signals; better suited for 5V legacy systems with higher noise margins | Select MAX147ACPP only if operating above 3.3V or when external T/H is already present in design |
| ADS7822U | 12-bit, 200ksps, SPI-only interface; 2.7V–5.25V supply; ±1 LSB INL; built-in reference; no SHDN pin | Lacks hardware shutdown and bipolar input support; integrated 2.5V reference simplifies BOM but limits ratiometric flexibility | Choose ADS7822U for cost-sensitive 3.3V/5V systems where internal reference suffices and power cycling is software-managed |
Compared with MAX147ACPP and ADS7822U, the MAX1245ACAP uniquely combines ultra-low 10µA shutdown current, integrated track/hold, bipolar input capability, and three-level SHDN control - making it optimal for energy-constrained, multi-range, mixed-signal portable instrumentation where analog signal integrity and power budget are co-critical.
Availability
MAX1245ACAP is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply across extended production lifecycles.
Supply support for MAX1245ACAP 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 MAX1245 belongs to Maxim's precision data-acquisition product line, designed specifically for low-power, multi-channel, serial-interface ADC applications in portable and battery-operated systems where size, energy efficiency, and signal fidelity are critical.
FAQ
What is the maximum sampling rate supported by the MAX1245ACAP?
The MAX1245ACAP achieves a maximum sampling rate of 100ksps when using a 1.5MHz external clock with 15 clock cycles per conversion. At this rate, the device draws 0.8mA from a +2.375V to +3.3V supply. Lower rates reduce current consumption linearly - e.g., 1ksps draws just 10µA - making the MAX1245ACAP highly adaptable to varying throughput and power requirements in portable systems.
Does the MAX1245ACAP require an external reference voltage?
Yes, the MAX1245ACAP requires an external reference voltage applied to the VREF pin. It is typically operated with a 2.048V reference to achieve a 500µV LSB step size in unipolar mode. The device specifies VREF input resistance of 18kΩ and draws 82–120µA, so the reference source must be stable to ±0.5LSB (±1mV) and capable of sourcing >120µA. Internal reference is not provided.
How does the SHDN pin function on the MAX1245ACAP?
The SHDN pin on the MAX1245ACAP provides three-level control: pulling it low places the device in 10µA shutdown mode; leaving it open configures the internal clock to 1.5MHz; pulling it high sets the internal clock to 225kHz. This hardware-based control enables rapid power-state transitions without serial commands, critical for burst-mode acquisition in battery-powered devices using the MAX1245ACAP.
Can the MAX1245ACAP perform differential measurements?
Yes, the MAX1245ACAP supports true differential measurements across four channel pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. In differential mode, the device samples the voltage difference |IN+ − IN−| while maintaining pseudo-differential architecture - requiring the IN− input to remain stable within ±0.5LSB relative to AGND. A 0.1µF capacitor from IN− to AGND is recommended for stability during conversion.
What serial interface protocols is the MAX1245ACAP compatible with?
The MAX1245ACAP supports SPI, QSPI, and MICROWIRE protocols via its 4-wire serial interface (SCLK, DIN, DOUT, CS). For SPI compatibility, configure the host controller with CPOL = 0 and CPHA = 0. The SSTRB output also enables direct connection to TMS320-family DSPs by signaling conversion start and completion without polling - a key feature distinguishing the MAX1245ACAP from generic serial ADCs.
MAX1245ACAP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.375V ~ 3.3V
- Voltage - Supply, Digital:
- 2.375V ~ 3.3V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1245ACAP FAQ
1.How can I place an order for MAX1245ACAP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1245ACAP 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 MAX1245ACAP reliable?
The price and inventory of MAX1245ACAP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1245ACAP is usually 5 days.
3.What payment methods are accepted for MAX1245ACAP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1245ACAP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1245ACAP?
MAX1245ACAP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1245ACAP 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 MAX1245ACAP?
For technical support, including MAX1245ACAP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1245ACAP requirements.
6.How does Aetrix verify that MAX1245ACAP is sourced from the original manufacturer or authorized distributors?
All MAX1245ACAP 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 MAX1245ACAP meets industry standards.
7.What is the process for return or replacement of MAX1245ACAP?
All MAX1245ACAP units undergo pre-shipment inspection (PSI). If there is an issue with MAX1245ACAP, 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 MAX1245ACAP part is unused and in its original packaging.
Return procedure for MAX1245ACAP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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