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Analog Devices Inc./Maxim Integrated MAX1245AEPP
- Part No.:
- MAX1245AEPP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1245AEPP.pdf
- Description:
- IC ADC 12BIT SAR 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:898
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Product details
Overview
MAX1245AEPP from Maxim Integrated is a -40°C to +85°C industrial-grade, 12-bit serial analog-to-digital converter with integrated 8-channel multiplexer, track/hold, and SPI/QSPI/MICROWIRE-compatible 4-wire interface. It operates from a single +2.375V to +3.3V supply, supports software-configurable unipolar/bipolar and single-ended/differential inputs, and achieves 100ksps conversion rate with 0.8mA active current. It is used in portable medical instruments requiring low-power, high-accuracy data acquisition under wide temperature conditions.
For engineers reviewing the MAX1245AEPP datasheet, MAX1245AEPP pinout, MAX1245AEPP application, or MAX1245AEPP equivalent, this page delivers verified technical context, exact pin functions, real-world application mappings, and validated alternative parts for industrial embedded systems design and battery-powered instrumentation.
Technical Context
The MAX1245AEPP uses successive-approximation architecture with an internal 12-bit capacitive DAC and on-chip track/hold circuitry. Its analog input sampling path supports pseudo-differential operation via CH0–CH7 and COM pins, with channel selection and mode configuration (unipolar/bipolar, single-ended/differential) controlled by an 8-bit serial command word.
It features dual clock modes: external clock (1.5MHz max, 15 clocks/conversion) for deterministic timing, or internal clock (1.5MHz or 225kHz, selected via SHDN pin state) enabling flexible host processor scheduling. The SSTRB output provides precise conversion start/end strobing for TMS320-family DSP synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step, enabling ±0.5LSB INL accuracy over full industrial temperature range. |
| Sampling Rate | 100ksps - supports real-time acquisition of signals up to 50kHz Nyquist bandwidth with minimal aliasing risk when paired with anti-alias filter. |
| Supply Voltage | +2.375V to +3.3V - compatible with modern low-voltage microcontrollers and battery systems (e.g., two Li-ion cells in series). |
| Power Consumption | 0.8mA at 100ksps; 10µA at 1ksps; 1µA in power-down - enables duty-cycled operation in energy-constrained portable data loggers. |
| Analog Input Range | 0V to VREF (unipolar) or ±VREF/2 (bipolar), with VREF = 2.048V typical - matches standard precision reference ICs and simplifies signal conditioning. |
| INL / DNL | ±0.5LSB / ±0.5LSB (MAX1245A grade) - ensures monotonicity and <0.012% full-scale linearity error across -40°C to +85°C. |
| Interface Protocol | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire serial - requires no level shifters or glue logic when interfacing with common MCU families. |
Pinout & Package
MAX1245AEPP is housed in a 20-pin plastic DIP package (0.300" width), RoHS-compliant and suitable for through-hole prototyping and industrial PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (CH0–CH7) | Analog input channels | Selectable as single-ended inputs referenced to COM or as differential pairs (CH0/CH1, CH2/CH3, etc.) - enables flexible sensor interfacing without external multiplexers. |
| 9 (COM) | Common-mode reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5LSB - requires local 0.1µF bypass to AGND for noise immunity. |
| 10 (SHDN) | Three-level hardware shutdown | Pull low → 10µA shutdown; open → 1.5MHz internal clock; pull high → 225kHz internal clock - enables dynamic power scaling without software overhead. |
| 11 (VREF) | External reference input | Accepts 0V to VDD voltage (typically 2.048V) - decouples accuracy from supply rail, supporting ratiometric or absolute measurement schemes. |
| 12, 20 (VDD) | Positive supply | Single +2.375V to +3.3V rail powers analog and digital sections - eliminates need for separate AVDD/DVDD supplies. |
| 13 (AGND) | Analog ground | Reference for analog inputs and VREF - must be star-connected and isolated from DGND to maintain >76dB channel-to-channel crosstalk. |
| 14 (DGND) | Digital ground | Reference for serial interface and logic - connected to AGND at single point near VDD pin to minimize ground bounce coupling. |
| 15 (DOUT) | Serial data output | 3-state MSB-first output clocked on SCLK falling edge - high-impedance when CS is high, enabling bus sharing with other SPI peripherals. |
| 16 (SSTRB) | Serial strobe output | Active-low pulse indicating conversion start (internal clock) or MSB decision timing (external clock) - directly interfaces with TMS320-series DSP external interrupt inputs. |
| 17 (DIN) | Serial data input | Accepts 8-bit control byte on SCLK rising edge - defines channel, polarity, mode, and clock source; first '1' bit initiates command parsing. |
| 18 (CS) | Chip select | Active-low enable for serial interface - must remain low during full 8-bit command write and subsequent 12-bit read sequence. |
| 19 (SCLK) | Serial clock | Drives data transfer and (in external mode) conversion timing - 50% duty cycle required; supports up to 1.5MHz for 100ksps operation. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input modes | Runtime selection of unipolar/bipolar and single-ended/differential via serial command - eliminates hardware jumpers and supports multi-sensor firmware reuse. |
| Internal track/hold with 100kHz acquisition rate | On-chip T/H eliminates external hold capacitor and reduces board area - acquisition time fixed at 2.0µs minimum, independent of source impedance below 1kΩ. |
| Three-level SHDN pin control | Hardware-selectable clock frequency (1.5MHz/225kHz) and power-down entry - enables deterministic wake-up latency without CPU intervention. |
| Low-noise 12-bit SAR architecture | 76dB channel-to-channel crosstalk and -76dB THD support simultaneous multi-channel monitoring of sensitive biomedical signals. |
| Industrial temperature grade (-40°C to +85°C) | Guaranteed ±0.5LSB INL and 12-bit monotonicity across full range - qualified for deployment in outdoor environmental sensors and factory-floor test equipment. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure every 10 seconds. IC Role / Device Role / Timing Role: ADC front-end digitizing conditioned analog outputs from multiple transducers via its 8-channel MUX and internal T/H. Use Value: 10µA shutdown current extends 2xAA battery life to >2 years; 12-bit resolution captures sub-degree thermal changes with ±0.5LSB linearity. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with real-time waveform display. IC Role / Device Role / Timing Role: Precision analog front-end converting amplified biopotential signals using CH0/CH1 differential pair and bipolar mode. Use Value: -76dB THD and 76dB crosstalk prevent interference between leads; SPI interface enables direct connection to ARM Cortex-M4 MCU. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
Use Scenario: Field-deployable multimeter measuring DC voltage, current, and resistance with auto-ranging. IC Role / Device Role / Timing Role: Core ADC performing sequential conversions across multiple input ranges using programmable gain amplifier and MAX1245AEPP's software-configurable input modes. Use Value: Single +2.375V to +3.3V supply simplifies power design; 0.8mA active current allows continuous operation from LiPo cell for >8 hours. |
Use Scenario: PLC analog input module acquiring 4–20mA loop signals from 8 pressure/flow sensors in chemical plant. IC Role / Device Role / Timing Role: Isolated channel ADC converting conditioned current-loop outputs using COM-referenced single-ended mode and external 2.048V reference. Use Value: Guaranteed -40°C to +85°C operation ensures reliability in unconditioned control cabinets; ±0.5LSB INL meets IEC 61000-4-3 immunity requirements. |
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 only for 0°C to +70°C; operates from +2.7V to +5.25V; ±1LSB INL (B-grade) | Suitable for commercial-grade data loggers where extended temperature range is not required | Select MAX147ACPP only if system ambient stays within 0°C–70°C and higher supply voltage margin is needed. |
| ADS7822U | 12-bit, 200ksps, SPI-only interface; +2.7V to +5.25V supply; no internal T/H; requires external reference | Higher speed but lacks integrated multiplexer and track/hold - demands additional external components for multi-channel use | Choose ADS7822U only when sampling rate >100ksps is mandatory and board space permits external T/H and MUX. |
Compared with MAX147ACPP, MAX1245AEPP offers guaranteed -40°C to +85°C operation and tighter ±0.5LSB INL, while ADS7822U trades integration for speed and requires external signal conditioning - making MAX1245AEPP optimal for compact, wide-temperature, low-power industrial sensing.
Availability
MAX1245AEPP is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and industrial process monitoring requiring stable component supply across extended temperature environments.
Supply support for MAX1245AEPP 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 industrial, medical, and communications applications.
The MAX1245 family delivers low-power, high-accuracy data acquisition solutions targeting battery-operated and thermally demanding embedded systems - emphasizing integration, software configurability, and guaranteed performance across industrial temperature ranges.
FAQ
What is the operating temperature range of the MAX1245AEPP?
The MAX1245AEPP is specified for -40°C to +85°C operation, meeting industrial-grade reliability requirements. This range is confirmed in the Ordering Information table and validated across all electrical parameters including INL (±0.5LSB), gain error (±0.5LSB), and supply current (0.8mA typical at 100ksps). The 'E' suffix explicitly denotes the extended temperature grade, distinguishing it from 'C' (0°C to +70°C) variants like MAX1245ACPP.
Does the MAX1245AEPP require an external reference voltage?
Yes, the MAX1245AEPP requires an external reference voltage applied to the VREF pin. It accepts 0V to VDD (typically 2.048V) and does not include an internal reference. The device's DC accuracy - including gain error (±0.5LSB) and INL (±0.5LSB) - is specified with VREF = 2.048V. Using a precision external reference (e.g., MAX6126) ensures full 12-bit performance across temperature and supply variations.
How does the SHDN pin function on the MAX1245AEPP?
The MAX1245AEPP SHDN pin is a three-level control: pulled low → 10µA shutdown mode; left open → 1.5MHz internal clock; pulled high → 225kHz internal clock. This hardware-selectable behavior eliminates software register writes for clock configuration and enables rapid power-state transitions. The pin's leakage is ±4.0µA, and its mid-voltage threshold is VDD/2, ensuring robust noise immunity in industrial environments.
Can the MAX1245AEPP perform differential measurements?
Yes, the MAX1245AEPP supports true pseudo-differential measurements using CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7 pairs. In differential mode (SGL/DIF = 0), the device samples |IN+ − IN−| with IN− held stable to ±0.5LSB. The internal architecture uses a switched-capacitor DAC and track/hold optimized for this mode, delivering 76dB channel-to-channel crosstalk and -76dB THD - critical for accurate biopotential or bridge-sensor readings.
What serial interface protocols does the MAX1245AEPP support?
The MAX1245AEPP supports SPI, QSPI, and MICROWIRE protocols via its 4-wire serial interface (CS, SCLK, DIN, DOUT). It requires CPOL = 0 and CPHA = 0 for SPI compatibility. The SSTRB output provides direct TMS320-family DSP synchronization. All timing - including tDO (data valid), tDV (output enable), and tSDV (strobe disable) - is fully characterized for 1.5MHz operation, ensuring reliable communication with common microcontrollers.
MAX1245AEPP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1245AEPP FAQ
1.How can I place an order for MAX1245AEPP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1245AEPP 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 MAX1245AEPP reliable?
The price and inventory of MAX1245AEPP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1245AEPP is usually 5 days.
3.What payment methods are accepted for MAX1245AEPP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1245AEPP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1245AEPP?
MAX1245AEPP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1245AEPP 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 MAX1245AEPP?
For technical support, including MAX1245AEPP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1245AEPP requirements.
6.How does Aetrix verify that MAX1245AEPP is sourced from the original manufacturer or authorized distributors?
All MAX1245AEPP 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 MAX1245AEPP meets industry standards.
7.What is the process for return or replacement of MAX1245AEPP?
All MAX1245AEPP units undergo pre-shipment inspection (PSI). If there is an issue with MAX1245AEPP, 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 MAX1245AEPP part is unused and in its original packaging.
Return procedure for MAX1245AEPP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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