My Inquiry
My Account
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:1,817
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1245AEPP+ 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, delivers 100ksps conversion rate, and achieves ±0.5 LSB INL at -40°C to +85°C. It is used in portable data loggers for low-power, high-accuracy sensor digitization.
For engineers reviewing the MAX1245AEPP+ datasheet, MAX1245AEPP+ pinout, MAX1245AEPP+ application, or MAX1245AEPP+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with documented differences, and supply support for industrial embedded and battery-powered systems.
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 is controlled by an 8-bit software-configurable command byte that selects channel, polarity, input mode, and clock source.
It supports two clock modes: external serial clock (up to 1.5MHz, 15 clocks/conversion) or internal clock (1.5MHz when SHDN open, 225kHz when SHDN high). Conversion timing is synchronized to SCLK falling edges, with SSTRB providing strobe indication-low during conversion in internal mode, pulsed before MSB output in external mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes across full-scale range, enabling sub-mV resolution with 2.048V reference. |
| Sampling Rate | 100ksps - supports real-time acquisition of signals up to ~50kHz (Nyquist-limited), suitable for vibration monitoring and ECG front-ends. |
| INL (Integral Nonlinearity) | ±0.5 LSB - ensures monotonicity and <0.012% full-scale error after calibration, critical for precision instrumentation. |
| Supply Current | 0.8mA at 100ksps; 10µA at 1ksps - enables ultra-low-power operation in battery-powered instruments with adaptive shutdown between conversions. |
| Analog Input Range | 0V to VREF (unipolar) or ±VREF/2 (bipolar) - configurable per channel via control byte, supporting both sensor offset and AC-coupled signal capture. |
| Reference Input | VREF pin accepts external 2.048V reference - allows system-level accuracy traceability and eliminates need for internal reference trimming. |
| Serial Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire - requires no level shifters or glue logic when interfacing with common microcontrollers and DSPs. |
Pinout & Package
MAX1245AEPP+ is housed in a 20-pin plastic DIP package (0.300" wide), RoHS-compliant and socket-compatible with legacy through-hole PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (CH0–CH7) | Analog input channels | Eight single-ended or four differential input pairs; selected via SEL2–SEL0 bits; input protection diodes clamp to VDD/AGND. |
| 9 (COM) | Analog common reference | Zero-code reference point in single-ended mode; must be stable to ±0.5 LSB; connects to AGND or mid-supply for bipolar operation. |
| 10 (SHDN) | Three-level shutdown control | Pull low → 10µA power-down; open → 1.5MHz internal clock; pull high → 225kHz internal clock - enables dynamic power scaling without firmware overhead. |
| 11 (VREF) | External reference voltage input | Accepts 2.048V reference; input resistance 18kΩ; current draw 82–120µA - supports precision external references with minimal loading. |
| 12, 20 (VDD) | Positive supply | +2.375V to +3.3V single supply; powers analog and digital sections; decoupling required at each VDD pin. |
| 13 (AGND) | Analog ground | Separate ground return for analog circuitry; must be star-connected to minimize noise coupling into T/H and comparator. |
| 14 (DGND) | Digital ground | Ground return for serial interface and logic; isolated from AGND except at single-point system ground. |
| 15 (DOUT) | Serial data output | 3-state output enabled when CS low; data valid on SCLK falling edge; MSB-first format; compatible with SPI MISO. |
| 16 (SSTRB) | Serial strobe output | Indicates conversion status: low during conversion (internal mode), one-clock pulse before MSB (external mode); aids timing-critical host synchronization. |
| 17 (DIN) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; start bit defined by first '1' after CS fall; supports MICROWIRE/SPI framing. |
| 18 (CS) | Active-low chip select | Enables serial interface and powers up device; high → DOUT/SSTRB tri-stated; required for multi-device bus sharing. |
| 19 (SCLK) | Serial clock input | Clocks data in/out; duty cycle 40–60%; in external mode, also drives SAR conversion - sets max sample rate and timing budget. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.375V to +3.3V - eliminates dual-rail supplies and simplifies power design for 3.3V microcontroller-based systems. |
| Software-configurable input modes | Per-conversion selection of unipolar/bipolar and single-ended/differential via control byte - enables flexible sensor interface without hardware rework. |
| Internal track/hold with 2.25MHz small-signal bandwidth | Eliminates external hold capacitor and reduces board area; supports accurate sampling of fast transients up to 2.25MHz. |
| Hardware + software shutdown | SHDN pin forces 10µA shutdown; software power-down extends to 1µA - enables µA-level sleep states in portable instruments. |
| 20-pin DIP/SSOP package options | DIP variant (MAX1245AEPP+) supports prototyping and legacy repair; SSOP offers 30% smaller footprint for space-constrained designs. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and pressure over weeks. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple analog sensor outputs with configurable gain and polarity, synchronized to low-power MCU wake cycles. Use Value: 0.8mA active current and 10µA shutdown enable >1-year battery life; 12-bit resolution captures sub-degree thermal drift. |
Use Scenario: Handheld ECG monitor acquiring lead-II differential signals with motion artifact rejection. IC Role / Device Role / Timing Role: Precision 12-bit ADC with pseudo-differential input and COM-referenced common-mode rejection for biopotential measurement. Use Value: ±0.5 LSB INL ensures diagnostic-grade linearity; software-selectable bipolar mode accommodates ±1.024V ECG swing without external level-shifting. |
| Battery-Powered Test Equipment | Industrial Data Acquisition |
Use Scenario: Pocket-sized multimeter with auto-ranging analog front-end and Li-ion battery management. IC Role / Device Role / Timing Role: High-accuracy ADC performing sequential channel scans (voltage, current, resistance) under MCU control. Use Value: 8-channel multiplexer reduces component count; 100ksps rate supports fast continuity testing; internal T/H eliminates external hold cap. |
Use Scenario: DIN-rail mounted PLC analog input module acquiring 4–20mA loop signals and thermocouple outputs. IC Role / Device Role / Timing Role: Isolated ADC interface handling multiple field sensor types with programmable input configuration per channel. Use Value: -40°C to +85°C operating range ensures reliability in harsh environments; VREF pin enables system-level calibration traceability. |
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 |
|---|---|---|---|
| MAX1245BCPP+ | Same package and pinout; ±1 LSB INL (vs. ±0.5 LSB for MAX1245AEPP+); 0°C to +70°C temp range. | Lower accuracy grade; suitable for non-critical industrial sensing where cost is prioritized over linearity. | Select MAX1245BCPP+ only if ±1 LSB INL meets system error budget and ambient temperature stays within commercial range. |
| ADS7822U | 12-bit, 200ksps, SPI-only interface; 2.7V–5.25V supply; no internal T/H; requires external reference and sampling capacitor. | Lacks integrated track/hold and software-configurable bipolar mode; higher supply voltage range but less flexible input architecture. | Choose ADS7822U only if higher speed is needed and external T/H/reference design is acceptable; not drop-in compatible. |
Compared with MAX1245BCPP+, the MAX1245AEPP+ provides tighter INL and extended temperature range for mission-critical portable instruments; compared with ADS7822U, it integrates T/H and supports bipolar/differential flexibility at lower supply voltage, reducing BOM count and layout complexity.
Availability
MAX1245AEPP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The MAX1245 product line delivers low-power, high-accuracy serial ADCs optimized for battery-operated and space-constrained systems requiring integrated signal conditioning and flexible digital interfacing.
FAQ
What is the operating temperature range of the MAX1245AEPP+?
The MAX1245AEPP+ is rated for -40°C to +85°C operation, making it suitable for industrial and automotive-adjacent applications where ambient conditions exceed commercial-grade limits. This extended range is confirmed in the Ordering Information table and applies to all electrical specifications unless otherwise noted in the datasheet's "Conditions" column.
Does the MAX1245AEPP+ require an external reference voltage?
Yes, the MAX1245AEPP+ requires an external reference applied to the VREF pin. It is designed to operate with a 2.048V reference, which sets the full-scale input range. The device does not include an internal reference; using an external precision reference ensures system-level accuracy and traceability, as specified in the Electrical Characteristics table under "VREF Input Voltage Range" and "VREF Input Current".
How does the SHDN pin function on the MAX1245AEPP+?
The SHDN pin on the MAX1245AEPP+ is a three-level control: pulled low → 10µA shutdown mode; left open → 1.5MHz internal clock; pulled high → 225kHz internal clock. This behavior is explicitly defined in the Pin Description section and enables hardware-triggered power scaling without serial command overhead, directly reducing supply current between conversions.
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. The SGL/DIF bit in the control byte selects differential mode, and Table 3 confirms channel pairing. In this mode, the device samples the voltage difference while maintaining stability requirements on the negative input (±0.5 LSB), as detailed in the Detailed Description section.
Is the MAX1245AEPP+ pin-compatible with other MAX1245 variants?
Yes, the MAX1245AEPP+ shares identical pinout and footprint with all MAX1245 variants in the 20-pin DIP package, including MAX1245ACPP+, MAX1245BCPP+, and MAX1245BEPP+. This mechanical compatibility is confirmed in the Ordering Information table and Pin Configuration diagram, allowing direct substitution where temperature range and INL grade meet design requirements.
MAX1245AEPP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- 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:
- -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.
MAX1245AEPP+ Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
