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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:3,276
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Product details
Overview
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, SPI/QSPI/MICROWIRE-compatible 4-wire interface, and ultra-low power operation (0.8mA at 100ksps, 10µA at 1ksps). It operates from a single +2.375V to +3.3V supply and is used in portable data loggers, battery-powered medical instruments, and compact industrial data acquisition systems.
For engineers reviewing the MAX1245ACAP+ datasheet, MAX1245ACAP+ pinout, MAX1245ACAP+ application, or MAX1245ACAP+ equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated SSOP-20 pin functions, confirmed alternatives for low-voltage 12-bit ADC replacement, and supply-chain support for volume OEM deployment.
Technical Context
The MAX1245ACAP+ employs successive-approximation register (SAR) architecture with an internal track/hold circuit enabling 100kHz sampling rate and 2.25MHz small-signal bandwidth. It supports both external clock (up to 1.5MHz) and internal clock modes (1.5MHz or 225kHz), with conversion timing defined by SCLK edges and SSTRB strobe signaling.
Its analog front-end allows flexible input configuration: 8 single-ended or 4 differential channels selected via 3-bit channel address; unipolar (0V to VREF) or bipolar (±VREF/2) ranges set by control byte; COM pin serves as zero-reference in single-ended mode and must remain stable within ±0.5LSB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for high-fidelity signal digitization in precision measurement. |
| Sampling Rate | 100ksps - supports real-time capture of fast transients up to 50kHz Nyquist frequency with external clock. |
| Supply Voltage | +2.375V to +3.3V - enables direct integration into 2.5V/3.3V battery-powered systems without level-shifting. |
| Power Consumption | 0.8mA at 100ksps; 10µA at 1ksps - allows aggressive duty-cycling in energy-constrained portable applications. |
| INL (Max) | ±0.5 LSB - ensures monotonicity and <0.012% full-scale error after calibration, critical for closed-loop control accuracy. |
| Input Configuration | Software-selectable 8-channel single-ended or 4-channel differential - eliminates external multiplexer hardware in multi-sensor designs. |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - interfaces directly to common microcontrollers without glue logic. |
Pinout & Package
MAX1245ACAP+ is housed in a 20-pin SSOP package (5.3mm × 7.2mm, 0.65mm pitch), occupying 30% less board area than the 20-pin DIP variant. Pin functions are electrically identical to the DIP version but mapped to SSOP physical layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Eight voltage-sensing nodes configurable as single-ended inputs referenced to COM or as four differential pairs (CH0/CH1, CH2/CH3, etc.). |
| COM (Pin 9) | Analog Common Reference | Zero-code reference in single-ended mode; must be stable to ±0.5LSB to avoid gain/offset errors during conversion. |
| SHDN (Pin 10) | Three-Level Shutdown Control | Pull low → 10µA shutdown; open → 1.5MHz internal clock; pull high → 225kHz internal clock - enables dynamic clock/power scaling. |
| VREF (Pin 11) | External Reference Input | Accepts 0V to VDD voltage (typically 2.048V); sets full-scale range and directly defines LSB size (VREF/4096). |
| DOUT (Pin 15) | Serial Data Output | MSB-first 12-bit result clocked on SCLK falling edge; high-impedance when CS is high - supports bus sharing. |
| DGND (Pin 14) & AGND (Pin 13) | Digital & Analog Ground | Separate ground returns minimize digital noise coupling into analog path; must be connected at single point near VDD decoupling. |
| VDD (Pins 12 & 20) | Positive Supply | Single 2.375V–3.3V rail powers analog and digital sections; requires local 0.1µF ceramic decoupling per VDD pin. |
| SCLK (Pin 19) | Serial Clock Input | Drives data transfer and (in external mode) controls conversion speed; 40%–60% duty cycle required for reliable operation. |
| CS (Pin 18) | Active-Low Chip Select | Enables serial interface and DOUT driver; falling edge initiates control byte acceptance, but conversion starts after PD0 bit. |
| DIN (Pin 17) | Serial Data Input | Accepts 8-bit control byte defining channel, polarity, mode, and clock selection; start bit is first '1' after CS fall. |
| SSTRB (Pin 16) | Serial Strobe Output | Signals conversion progress: low during conversion (internal mode) or pulses high before MSB (external mode) - synchronizes host read timing. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates dual-rail generation and level-shifting circuitry in portable 2.5V/3.3V systems, reducing BOM count and PCB area. |
| Software-configurable input modes | Runtime reconfiguration of unipolar/bipolar and single-ended/differential operation via control byte - enables one firmware image across multiple sensor types. |
| Hardware + software power-down | SHDN pin forces 10µA shutdown; control byte can auto-shutdown post-conversion - extends battery life in intermittent-sampling applications. |
| Internal track/hold | Removes need for external hold capacitor and driver amplifier, simplifying analog front-end design and improving acquisition consistency. |
| 12-bit accuracy with ±0.5 LSB INL | Meets industrial-grade linearity requirements for sensor calibration, process monitoring, and medical diagnostics without post-fabrication trimming. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over weeks on coin-cell power. IC Role / Device Role / Timing Role: Primary ADC acquiring 8 analog sensor outputs sequentially at 1–10Hz, using software-configured single-ended mode and automatic power-down between samples. Use Value: 10µA shutdown current and 0.8mA active current enable >1-year operation; SSOP-20 footprint minimizes PCB size for compact enclosure integration. |
Use Scenario: Handheld ECG monitor digitizing biopotential signals from 3–6 electrodes with high common-mode rejection. IC Role / Device Role / Timing Role: Differential-input ADC measuring electrode voltage differences (e.g., CH0–CH1, CH2–CH3) in bipolar mode with 2.048V reference for ±1.024V full-scale range. Use Value: ±0.5 LSB INL and 76dB channel-to-channel crosstalk ensure accurate waveform morphology; low power avoids thermal drift in skin-contact devices. |
| Battery-Powered Test Equipment | Industrial Data Acquisition |
Use Scenario: Pocket-sized multimeter or insulation tester requiring precise DC voltage/current measurement with autoranging. IC Role / Device Role / Timing Role: Configurable ADC switching between unipolar (0–2.048V) and bipolar (±1.024V) ranges via control byte, using COM as reference for offset nulling. Use Value: Software-selectable input range eliminates external range-switching relays or op-amp gain stages, reducing cost and failure points. |
Use Scenario: DIN-rail mounted PLC analog input module acquiring 8 field sensor signals (4–20mA, thermocouple, RTD) in harsh industrial environments. IC Role / Device Role / Timing Role: High-accuracy ADC with separate AGND/DGND pins and ±0.25ppm/°C gain tempco, operating from isolated 3.3V supply with local decoupling. Use Value: 12-bit resolution and ±0.5 LSB INL meet IEC 61000-4-5 surge immunity requirements for 0.1% measurement accuracy across -40°C to +85°C. |
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 |
|---|---|---|---|
| MAX147ACPP+ | Pin-compatible 12-bit ADC with wider supply range (+2.7V to +5.25V); higher INL (±1 LSB); no SSTRB output. | Preferred where system uses 5V logic or legacy 5V supply rails; unsuitable when SSTRB-synchronized read timing is required. | Select MAX147ACPP+ only if 5V operation is mandatory and SSTRB functionality is unused. |
| ADS7822U | 12-bit, 200ksps, SPI-only interface; 2.7V–5.25V supply; no hardware SHDN pin; higher typical IDD (1.5mA @ 200ksps). | Better for high-speed sampling in 3.3V/5V mixed-signal systems; lacks three-level shutdown and TMS320 compatibility. | Choose ADS7822U when maximum throughput >100ksps is needed and power budget allows ~1.5mA continuous draw. |
Compared with MAX147ACPP+, MAX1245ACAP+ offers tighter INL and integrated SSTRB for deterministic timing; compared with ADS7822U, it provides lower active/shutdown current and flexible clock mode selection - making it optimal for battery longevity and multi-processor ecosystem integration.
Availability
MAX1245ACAP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and industrial data acquisition requiring stable component supply, long-term lifecycle support, and guaranteed SSOP-20 packaging.
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 ADC family designed for low-power, high-accuracy digitization in space- and energy-constrained systems - emphasizing single-supply operation, software configurability, and minimal external components.
FAQ
What is the maximum sampling rate achievable with MAX1245ACAP+?
The MAX1245ACAP+ achieves up to 100ksps when using an external 1.5MHz clock with 15 clock cycles per conversion. In internal clock mode, the maximum effective rate is limited by the 7.5µs conversion time, yielding ~133ksps theoretical peak, but datasheet-specified performance is guaranteed at 100ksps. The MAX1245ACAP+ timing assumes proper acquisition time (≥2.0µs) and stable VREF/COM references.
Does MAX1245ACAP+ require external passive components for basic operation?
Yes - the MAX1245ACAP+ requires at minimum two 0.1µF ceramic decoupling capacitors (one per VDD pin), a 0.1µF capacitor from COM to AGND in differential mode, and a stable external reference (e.g., 2.048V) applied to VREF. No external hold capacitor or op-amp driver is needed due to its integrated track/hold circuit.
How does the SHDN pin function on MAX1245ACAP+?
The SHDN pin on MAX1245ACAP+ provides three-level control: pulled low → 10µA shutdown; left open → internal 1.5MHz clock enabled; pulled high → internal 225kHz clock enabled. This allows dynamic trade-offs between conversion speed and power consumption without firmware intervention.
Can MAX1245ACAP+ interface directly with a TMS320 DSP?
Yes - the MAX1245ACAP+ serial strobe output (SSTRB) is explicitly designed for direct connection to TMS320-family DSPs. In external clock mode, SSTRB pulses high for one clock period before the MSB appears on DOUT, providing precise hardware synchronization for DMA-triggered reads without CPU overhead.
What is the guaranteed integral nonlinearity (INL) specification for MAX1245ACAP+?
The MAX1245ACAP+ has a guaranteed maximum INL of ±0.5 LSB over the 0°C to +70°C temperature range, as specified for the 'A' grade in the Ordering Information table. This applies under standard test conditions: VDD = +2.375V to +3.3V, VREF = 2.048V, fCLK = 1.5MHz, and unipolar single-ended input mode.
MAX1245ACAP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- 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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