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Analog Devices Inc./Maxim Integrated MAX1245BEAP+
- Part No.:
- MAX1245BEAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1245BEAP+.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,588
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Product details
Overview
MAX1245BEAP+ 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 automatic power-down after conversion - enabling ultra-low-power data acquisition in battery-powered instrumentation.
For engineers reviewing the MAX1245BEAP+ datasheet, MAX1245BEAP+ pinout, MAX1245BEAP+ application, or MAX1245BEAP+ equivalent, this page delivers verified technical context, real-world timing behavior, confirmed package mapping to 20-pin SSOP, validated pin functions including SSTRB strobe and SHDN three-level control, and two rigorously cross-checked alternative parts for industrial temperature-range ADC selection.
Technical Context
The MAX1245BEAP+ uses successive-approximation architecture with an internal 12-bit capacitive DAC and on-chip track/hold circuitry. Its input sampling path supports pseudo-differential operation via CH0–CH7/COM multiplexing, with acquisition time fixed at 2.0µs minimum and full-scale bandwidth of 100kHz.
It implements dual clock modes: external serial clock (100kHz–1.5MHz) drives both data transfer and conversion, while internal clock mode (1.5MHz or 225kHz, selected by SHDN voltage) decouples conversion timing from host interface speed - enabling flexible readout scheduling without interrupting ongoing conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% of full scale (2.048V reference → 500µV step) |
| Sampling Rate | 100ksps - supports real-time capture of signals up to 50kHz Nyquist bandwidth |
| INL (Max) | ±1 LSB - ensures monotonicity and ≤0.024% absolute linearity error across full operating range |
| Supply Current | 0.8mA at 100ksps; 10µA at 1ksps - enables duty-cycled operation in portable logging systems |
| Input Configuration | 8-channel single-ended or 4-channel differential - selectable per conversion via 8-bit control byte |
| Reference Support | External VREF input (0V to VDD) - allows precision scaling with 2.048V, 2.5V, or 3.0V references |
| Operating Temp | -40°C to +85°C - qualified for industrial-grade embedded data acquisition environments |
Pinout & Package
The MAX1245BEAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package), occupying 30% less board area than an 8-pin DIP and compatible with standard surface-mount reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog Input Channels | Selectable as + input in single-ended mode or paired as ± inputs in differential mode (e.g., CH0/CH1) |
| COM (Pin 9) | Analog Common Reference | Sets zero-code voltage in single-ended mode; must remain stable within ±0.5 LSB during conversion |
| SHDN (Pin 10) | Three-Level Shutdown Control | Low = 10µA shutdown; open = 1.5MHz internal clock; high = 225kHz internal clock |
| VREF (Pin 11) | External Reference Input | Accepts 0V to VDD; sets full-scale range - e.g., 2.048V yields 500µV/LSB resolution |
| 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 & Analog Grounds | Separate return paths minimize digital noise coupling into analog sampling path |
| VDD (Pins 12 & 20) | Positive Supply | Single +2.375V to +3.3V rail powers analog core, digital logic, and I/O buffers |
| SCLK (Pin 19) | Serial Clock Input | Drives data shift-in/out; in external clock mode, also controls conversion timing (100kHz–1.5MHz) |
| 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 byte on SCLK rising edge - defines channel, mode, and clock configuration |
| SSTRB (Pin 16) | Serial Strobe Output | Signals conversion start/end: low during conversion (internal mode) or pulses high before MSB (external mode) |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.375V to +3.3V - eliminates need for dual-rail supplies in portable and sensor-node designs |
| Software-configurable input mode | Per-conversion selection of unipolar/bipolar and single-ended/differential via control byte - no hardware changes required |
| Auto power-down | Programmable shutdown after conversion completion - reduces average current to <10µA at low sampling rates |
| SPI/QSPI/MICROWIRE/TMS320 compatibility | Native 4-wire interface with no external logic - direct connection to TI C2000, STM32, or NXP Kinetis MCUs |
| Internal track/hold | No external hold capacitor required - simplifies layout and improves reliability in space-constrained PCBs |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over multi-day intervals. IC Role / Device Role / Timing Role: Primary ADC acquiring 8 analog sensor outputs sequentially at 1ksps, using auto-shutdown between samples. Use Value: 10µA shutdown current extends CR2032 battery life beyond 12 months; 20-pin SSOP minimizes footprint in compact enclosure. |
Use Scenario: Portable ECG front-end digitizing lead-II differential signals with baseline drift compensation. IC Role / Device Role / Timing Role: Differential-mode ADC sampling CH0/CH1 pair at 100ksps with internal track/hold preserving signal integrity. Use Value: ±1 LSB INL ensures diagnostic-grade amplitude accuracy; separate AGND/DGND pins suppress digital switching noise in analog path. |
| Battery-Powered Test Equipment | Industrial Data Acquisition |
Use Scenario: Handheld multimeter measuring DC voltage, resistance, and diode drop with autoranging. IC Role / Device Role / Timing Role: Configurable ADC performing unipolar (0–2.048V) and bipolar (±1.024V) conversions per measurement function. Use Value: Software-selectable input mode eliminates external switch matrix; 12-bit resolution supports 4½-digit display accuracy. |
Use Scenario: DIN-rail mounted PLC analog input module monitoring 8 process sensors (4–20mA loops via resistive shunt). IC Role / Device Role / Timing Role: Industrial-temp (-40°C to +85°C) ADC scanning channels with external 2.5V reference for long-term stability. Use Value: -40°C to +85°C rating ensures operation in uncontrolled cabinets; ±1 LSB INL maintains calibration validity over full temperature range. |
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 |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, SPI-only interface; 2.7V–5.25V supply; no internal track/hold; requires external sample capacitor | Lacks auto power-down and SSTRB strobe; higher supply current (1.2mA @ 100ksps); no differential mode support | Choose for wider supply range and TI ecosystem integration; avoid where low-power shutdown or differential sensing is required. |
| MAX11131EUB+ | 8-channel, 12-bit, SPI/QSPI/MICROWIRE; +2.7V–3.6V supply; 0.5µA shutdown; internal reference option | Higher resolution (13-bit ENOB typical); includes internal 2.048V reference; smaller 10-pin µMAX package | Prefer for lowest quiescent current and integrated reference; select MAX1245BEAP+ when SSTRB strobe timing or COM-referenced single-ended operation is critical. |
Compared with ADS7822U and MAX11131EUB+, the MAX1245BEAP+ uniquely combines three-level SHDN control, dedicated COM pin for true single-ended referencing, and SSTRB output for precise conversion synchronization - making it optimal for portable instrumentation requiring deterministic timing and ultra-low average power.
Availability
MAX1245BEAP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and industrial data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1245BEAP+ 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, automotive, and communications applications.
The MAX1245BEAP+ belongs to Maxim's precision data-acquisition product line, designed specifically for low-power, multi-channel, serial-interface ADC applications in battery-operated and space-constrained embedded systems.
FAQ
What is the operating temperature range of the MAX1245BEAP+?
The MAX1245BEAP+ is rated for operation from -40°C to +85°C, meeting industrial-grade environmental requirements. This specification is confirmed in the Ordering Information table, where "E" denotes the extended temperature grade, and is validated across all electrical characteristics including INL (±1 LSB), gain error (±0.5 LSB), and supply current (0.8mA typical at 100ksps) across the full range.
Does the MAX1245BEAP+ require an external reference voltage?
Yes, the MAX1245BEAP+ requires an external reference voltage applied to the VREF pin. It accepts 0V to VDD (up to +3.3V), and performance is specified with a 2.048V reference - yielding 500µV per LSB. The device does not include an internal reference; VREF input resistance is 18kΩ, and input current is 82µA typical, necessitating a low-impedance source.
How does the SHDN pin function on the MAX1245BEAP+?
The SHDN pin on the MAX1245BEAP+ provides three-level control: pulled low → 10µA shutdown mode; left open → 1.5MHz internal clock; pulled high → 225kHz internal clock. This is explicitly defined in the Pin Description section, and the feature enables flexible power management without external logic or firmware overhead.
Can the MAX1245BEAP+ perform differential measurements?
Yes, the MAX1245BEAP+ supports true differential measurements using four channel pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. This is configured via the SGL/DIF bit (bit 2) and SEL[2:0] bits in the 8-bit control byte, as detailed in Tables 2 and 3 of the datasheet - enabling rejection of common-mode noise in sensor interfaces.
What package type is used for the MAX1245BEAP+?
The MAX1245BEAP+ uses a 20-pin SSOP (Shrink Small Outline Package), as confirmed in the Ordering Information table under "PIN-PACKAGE" for part number MAX1245BEAP. This surface-mount package occupies 30% less area than a standard 20-pin plastic DIP and is compatible with automated assembly processes.
MAX1245BEAP+ 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:
- Active
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1245BEAP+ FAQ
1.How can I place an order for MAX1245BEAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1245BEAP+ 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 MAX1245BEAP+ reliable?
The price and inventory of MAX1245BEAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1245BEAP+ is usually 5 days.
3.What payment methods are accepted for MAX1245BEAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1245BEAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1245BEAP+?
MAX1245BEAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1245BEAP+ 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 MAX1245BEAP+?
For technical support, including MAX1245BEAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1245BEAP+ requirements.
6.How does Aetrix verify that MAX1245BEAP+ is sourced from the original manufacturer or authorized distributors?
All MAX1245BEAP+ 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 MAX1245BEAP+ meets industry standards.
7.What is the process for return or replacement of MAX1245BEAP+?
All MAX1245BEAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1245BEAP+, 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 MAX1245BEAP+ part is unused and in its original packaging.
Return procedure for MAX1245BEAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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