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Analog Devices Inc./Maxim Integrated MAX1245ACPP
- Part No.:
- MAX1245ACPP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1245ACPP.pdf
- Description:
- IC ADC 12BIT SAR 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:316
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Product details
Overview
MAX1245ACPP from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, SPI/QSPI/MICROWIRE-compatible 4-wire interface, and software-configurable unipolar/bipolar single-ended/differential inputs. It operates from a single +2.375V to +3.3V supply, delivers 100ksps conversion rate, consumes only 0.8mA active current, and supports automatic power-down after conversion - enabling use in portable data loggers and battery-powered medical instruments.
For engineers reviewing the MAX1245ACPP datasheet, MAX1245ACPP pinout, MAX1245ACPP application, or MAX1245ACPP 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-chain support for industrial embedded and low-power measurement systems.
Technical Context
The MAX1245ACPP implements successive-approximation register (SAR) architecture with an internal track/hold circuit that acquires input signals within 2.0µs and supports up to 100kHz sampling rate. Its analog front-end accepts 8 single-ended or 4 differential inputs referenced to COM, with programmable unipolar (0V to VREF) or bipolar (±VREF/2) ranges using a 2.048V external reference.
Digital control is executed via an 8-bit command byte shifted into DIN on SCLK rising edges, defining channel selection (CH0–CH7), input mode (SGL/DIF), polarity (UNI/BIP), and clock source (internal/external). Conversion timing is synchronized either to the internal 1.5MHz oscillator (SHDN open) or to an external SCLK signal (100kHz–1.5MHz), with SSTRB providing precise start/end strobes for TMS320-family DSP interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC - delivers 1 LSB = 0.5mV at 2.048V reference, sufficient for 0.025% full-scale accuracy in precision sensor readout. |
| INL (Max) | ±0.5 LSB - ensures monotonicity and <0.012% integral nonlinearity error across full temperature range (0°C to +70°C). |
| Sampling Rate | 100ksps - enables real-time capture of 50kHz baseband signals with Nyquist margin, suitable for ECG and vibration monitoring. |
| Supply Current | 0.8mA at 100ksps; 10µA at 1ksps - allows duty-cycled operation in battery-powered instruments to extend runtime beyond 1 year on a CR2032 cell. |
| Analog Input Range | 0V to +2.048V (unipolar) or ±1.024V (bipolar) - matches standard voltage references and eliminates need for external level-shifting op-amps. |
| Interface Compatibility | SPI/QSPI/MICROWIRE/TMS320 - connects directly to common microcontrollers (e.g., STM32, MSP430) without glue logic or level translators. |
| Package | 20-pin plastic DIP - provides through-hole mounting for prototyping and legacy industrial PCBs, with 2.54mm pitch and 0.3" width. |
Pinout & Package
MAX1245ACPP is housed in a 20-pin plastic DIP package (0.3" wide, 2.54mm pitch), RoHS-compliant and rated for 0°C to +70°C operation. Pin functions are electrically validated per Maxim's datasheet Rev 1 (11/09) and confirmed against typical operating circuits and pin description tables.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (CH0–CH7) | Analog input channels | Selectable as single-ended (vs. COM) or differential pairs (CH0/CH1, CH2/CH3, etc.); require stable COM reference ≤±0.5LSB for accurate sampling. |
| 9 (COM) | Analog ground reference | Sets zero-code voltage in single-ended mode; must be decoupled with 0.1µF capacitor to AGND to minimize offset drift. |
| 10 (SHDN) | Three-level shutdown control | Pull low → 10µA shutdown; leave open → 1.5MHz internal clock; pull high → 225kHz internal clock - enables dynamic power scaling. |
| 11 (VREF) | External reference input | Accepts 2.048V reference (±0.5% tolerance); sets full-scale range and directly determines LSB size (0.5mV). |
| 12, 20 (VDD) | Positive supply | +2.375V to +3.3V single supply - eliminates dual-rail requirement and simplifies power design in compact portable systems. |
| 13 (AGND) | Analog ground | Separate from DGND to prevent digital noise coupling; must be tied to system analog ground at single point near VREF. |
| 14 (DGND) | Digital ground | Reference for all digital I/O pins; requires low-inductance connection to VDD decoupling capacitor (0.1µF ceramic). |
| 15 (DOUT) | Serial data output | 3-state MSB-first output clocked on SCLK falling edge; high-impedance when CS is high - enables bus sharing. |
| 16 (SSTRB) | Serial strobe output | Active-low pulse indicating conversion start/end; synchronizes data capture in TMS320 DSPs without external timing logic. |
| 17 (DIN) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; first '1' bit defines MSB - tolerant of leading zeros for flexible firmware framing. |
| 18 (CS) | Chip select | Active-low enable; controls DOUT three-state behavior and initiates command byte recognition - supports multi-device SPI buses. |
| 19 (SCLK) | Serial clock | Drives data transfer and (in external mode) conversion timing; 40%–60% duty cycle required; max 1.5MHz for full performance. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | +2.375V to +3.3V - eliminates need for negative rails or charge pumps, reducing BOM count and board area in portable designs. |
| Software-configurable input modes | Runtime-selectable unipolar/bipolar and single-ended/differential via control byte - enables one hardware design to serve multiple sensor types (thermocouples, strain gauges, RTDs). |
| Hardware + software power-down | SHDN pin forces 10µA shutdown; PD bits auto-shutdown post-conversion - cuts average current to <1µA at 1Hz sampling, extending battery life. |
| Internal track/hold | No external hold capacitor required - reduces component count and layout sensitivity while maintaining 100kHz effective sampling bandwidth. |
| 4-wire serial interface | SPI/QSPI/MICROWIRE/TMS320 compatible - interoperates with industry-standard controllers without protocol translation or FPGA logic. |
| 20-pin DIP package | Through-hole mounting with 2.54mm pitch - supports manual assembly, breadboarding, and long-lifecycle industrial replacements without requalification. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over weeks. IC Role / Device Role / Timing Role: 12-bit ADC digitizing multiplexed analog sensor outputs with low quiescent current and software-triggered conversions. Use Value: 0.8mA active current and 10µA shutdown enable >12-month operation on two AA cells; 8-channel mux reduces external multiplexer cost. |
Use Scenario: Portable ECG monitor acquiring lead-II differential signals with baseline stability and low noise. IC Role / Device Role / Timing Role: Bipolar differential ADC sampling at 1ksps with ±1.024V range and internal track/hold for artifact rejection. Use Value: ±0.5 LSB INL and 76dB crosstalk ensure diagnostic-grade waveform fidelity; COM-referenced architecture minimizes common-mode errors. |
| Battery-Powered Test Equipment | Industrial Data Acquisition |
Use Scenario: Handheld multimeter measuring DC voltage, resistance, and continuity with autoranging and backlit display. IC Role / Device Role / Timing Role: Precision ADC converting scaled analog inputs under microcontroller control, with unipolar mode for voltage and ratiometric mode for resistance. Use Value: 2.048V reference compatibility enables direct 12-bit resolution (0.025% FS); 20-pin DIP allows easy replacement during field calibration. |
Use Scenario: PLC analog input module conditioning 4–20mA current loop signals in factory automation cabinets. IC Role / Device Role / Timing Role: Isolated ADC front-end digitizing conditioned voltage outputs from current-sense amplifiers, operating from 3.3V rail. Use Value: Single +3.3V supply simplifies isolated power design; 100ksps rate supports oversampling for noise reduction in noisy industrial environments. |
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 MAX1245ACPP); no internal track/hold - requires external TH. | Better suited for 5V systems with higher supply headroom; lacks integrated track/hold, increasing external component count and layout complexity. | Select MAX147ACPP only if operating above +3.3V or when external TH is already present; otherwise MAX1245ACPP offers superior integration and accuracy at 3.3V. |
| ADS7822U | 12-bit, 200ksps, SPI-only interface; 2.7V–5.25V supply; ±1 LSB INL; no SHDN pin; uses internal reference (2.5V) - no external VREF required. | Higher speed and simpler reference scheme, but lacks bipolar mode, COM pin, and hardware shutdown - limiting flexibility in sensor-mux and ultra-low-power designs. | Choose ADS7822U for fixed-unipolar, high-speed 5V applications where reference simplicity outweighs configurability; MAX1245ACPP remains preferred for battery-powered, multi-mode, low-voltage systems. |
Compared with MAX147ACPP and ADS7822U, the MAX1245ACPP uniquely combines sub-1V supply operation, integrated track/hold, bipolar input capability, and hardware shutdown - making it the only option among the three qualified for 2.4V battery-powered medical sensors requiring diagnostic-grade linearity and minimal external components.
Availability
MAX1245ACPP is available at Aetrix Electronics and suitable for portable data logging, battery-powered instrumentation, and industrial data acquisition requiring stable component supply, long-term lifecycle support, and through-hole manufacturability.
Supply support for MAX1245ACPP 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 measurement systems.
FAQ
What is the maximum sampling rate supported by the MAX1245ACPP?
The MAX1245ACPP supports a maximum sampling rate of 100ksps when using a 1.5MHz external clock or its internal 1.5MHz oscillator. At this rate, conversion time is 7.5µs (15 clock cycles × 0.5µs period), and the device draws 0.8mA from the +2.375V to +3.3V supply. Lower rates reduce current consumption proportionally - e.g., 1ksps draws just 10µA.
Does the MAX1245ACPP require an external reference voltage?
Yes, the MAX1245ACPP requires an external reference voltage applied to the VREF pin. The datasheet specifies optimal performance with a 2.048V reference (±0.5% tolerance), which sets the full-scale range and determines LSB size (0.5mV). While other voltages between 1.0V and VDD are allowed, deviation degrades accuracy - the MAX1245ACPP does not include an internal reference.
How does the SHDN pin function on the MAX1245ACPP?
The SHDN pin on the MAX1245ACPP is a three-level control: pulled low → forces 10µA shutdown mode; left open → enables 1.5MHz internal clock; pulled high → selects 225kHz internal clock. This allows dynamic power scaling without firmware intervention. In external clock mode, SHDN state does not affect conversion timing but still controls supply current.
Can the MAX1245ACPP perform differential measurements?
Yes, the MAX1245ACPP supports true differential measurements using four predefined channel pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. This is configured via the SGL/DIF bit (bit 2) in the 8-bit control byte. In differential mode, the device samples |IN+ − IN−| with COM disconnected, requiring stable IN− reference (≤±0.5LSB) via local 0.1µF decoupling to AGND.
What package type is used for the MAX1245ACPP?
The MAX1245ACPP is supplied in a 20-pin plastic DIP package (0.3" width, 2.54mm pitch), specified in the Ordering Information table as "20 Plastic DIP". This through-hole package supports manual assembly, prototyping, and legacy industrial PCBs, and is distinct from the SSOP variant (MAX1245ACAP) which shares electrical specs but differs mechanically.
MAX1245ACPP 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX1245ACPP FAQ
1.How can I place an order for MAX1245ACPP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1245ACPP 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 MAX1245ACPP reliable?
The price and inventory of MAX1245ACPP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1245ACPP is usually 5 days.
3.What payment methods are accepted for MAX1245ACPP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1245ACPP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1245ACPP?
MAX1245ACPP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1245ACPP 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 MAX1245ACPP?
For technical support, including MAX1245ACPP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1245ACPP requirements.
6.How does Aetrix verify that MAX1245ACPP is sourced from the original manufacturer or authorized distributors?
All MAX1245ACPP 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 MAX1245ACPP meets industry standards.
7.What is the process for return or replacement of MAX1245ACPP?
All MAX1245ACPP units undergo pre-shipment inspection (PSI). If there is an issue with MAX1245ACPP, 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 MAX1245ACPP part is unused and in its original packaging.
Return procedure for MAX1245ACPP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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