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Analog Devices Inc./Maxim Integrated MAX146AEPP
- Part No.:
- MAX146AEPP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX146AEPP.pdf
- Description:
- IC ADC 12BIT SAR 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,506
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Product details
Overview
MAX146AEPP 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, internal 2.5V reference, and SPI/QSPI/MICROWIRE-compatible 4-wire serial interface. It operates from a single +2.7V to +3.6V supply, consumes 1.2mA at 133ksps, and supports portable data logging and battery-powered instrumentation.
For engineers reviewing the MAX146AEPP datasheet, MAX146AEPP pinout, MAX146AEPP application, or MAX146AEPP equivalent, this page delivers verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support tailored for low-power embedded ADC selection.
Technical Context
The MAX146AEPP uses successive-approximation architecture with an on-chip track/hold circuit that acquires input signals in ≤1.5µs. Its analog front-end supports pseudo-differential sampling: in single-ended mode, IN+ connects to CH0–CH7 and IN− to COM; in differential mode, IN+/IN− are selected from CH0/CH1, CH2/CH3, CH4/CH5, or CH6/CH7 pairs.
Conversion is clocked either internally or via external SCLK (up to 2MHz), with full 12-bit resolution achieved in 15 clock cycles. The device features a hard-wired SHDN pin and software-selectable power-down modes-full shutdown (≤1µA), fast shutdown (54µA at 1ksps), and automatic post-conversion shutdown-enabling ultra-low average current in duty-cycled systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = ±0.5mV @ 2.5V reference, sufficient for precision sensor digitization in medical and industrial instruments. |
| Sampling Rate | 133ksps - enables real-time capture of audio-band and control-loop signals without undersampling artifacts. |
| INL | ±0.5 LSB - ensures monotonicity and <0.012% full-scale linearity error after calibration, critical for closed-loop feedback accuracy. |
| Supply Current | 1.2mA @ 133ksps / 54µA @ 1ksps - allows dynamic power scaling in energy-constrained portable devices. |
| Reference | Internal 2.500V ±0.8% (±20mV) - eliminates need for external reference IC, reducing BOM count and layout area in space-sensitive designs. |
| Input Configuration | 8-channel single-ended or 4-channel differential - supports flexible signal routing for multi-sensor systems without external multiplexers. |
| Interface | SPI/QSPI/MICROWIRE/TMS320-compatible 4-wire serial - integrates directly with common microcontrollers and DSPs without level-shifting or glue logic. |
Pinout & Package
MAX146AEPP is housed in a 20-pin plastic DIP package (0°C to +70°C operating range), with through-hole mounting compatible with standard prototyping and industrial PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Accept single-ended (vs. COM) or differential (paired) signals; input protection clamps to AGND/VDD ±0.3V. |
| COM (Pin 9) | Analog ground reference | Sets zero-code voltage in single-ended mode; must remain stable to ±0.5 LSB during conversion. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low → full shutdown (1µA); float → external compensation mode; pull high → internal compensation mode. |
| VREF (Pin 11) | Reference buffer output / ADC reference input | Delivers 2.500V ±0.8% (MAX146 only); bypassed with 4.7µF capacitor for stability in internal mode. |
| REFADJ (Pin 12) | Reference buffer adjustment input | Enables ±1.5% VREF tuning; tie to VDD to disable internal reference buffer when using external reference. |
| DIN (Pin 17) | Serial data input | Accepts 8-bit control byte on SCLK rising edge; START bit defines MSB; configures channel, polarity, and clock mode. |
| SCLK (Pin 19) | Serial clock input | Drives data transfer and (in external mode) conversion timing; 50% duty cycle required; max 2MHz frequency. |
| CS (Pin 18) | Active-low chip select | Enables serial interface; DOUT and SSTRB go high-impedance when CS is high, enabling bus sharing. |
| DOUT (Pin 15) | Serial data output | Outputs 12-bit result MSB-first on SCLK falling edge; tri-stated when CS is high. |
| SSTRB (Pin 16) | Serial strobe output | Pulses high one SCLK period before MSB in external mode; indicates conversion start/end in internal mode. |
| AGND (Pin 13) | Analog ground | Separate ground return for analog circuitry; must be tied to DGND at single point to minimize noise coupling. |
| DGND (Pin 14) | Digital ground | Ground return for digital I/O; isolation from AGND preserves ADC SNR and THD performance. |
| VDD (Pin 20) | Positive supply | +2.7V to +3.6V single supply; powers analog and digital sections; PSR = ±0.3mV over full VDD range. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended/differential and unipolar/bipolar selection via 8-bit control byte-enables runtime reconfiguration without hardware changes. |
| Low-power shutdown architecture | Three power states (full shutdown ≤1µA, fast shutdown 54µA, auto-shutdown post-conversion) reduce average current in burst-mode acquisition. |
| Integrated reference buffer | 2.500V ±0.8% output with ±1.5% adjustability and 30ppm/°C tempco-eliminates external reference and trimming components. |
| Track/hold acquisition time | ≤1.5µs - supports accurate sampling of signals up to 2.25MHz small-signal bandwidth, enabling undersampling of higher-frequency transients. |
| Robust analog input protection | Clamp diodes limit CHx/COM to AGND −0.3V / VDD +0.3V; safe operation with ±50mV overdrive at full scale. |
| Direct TMS320 DSP interface | SSTRB strobe output synchronizes with conversion completion-allows seamless integration with TI C5000/C6000 series without external timing logic. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental sensor node recording temperature, humidity, and pressure over days. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple analog sensor outputs with configurable gain and offset correction. Use Value: 1.2mA active current and 1µA shutdown enable >1-year battery life; internal reference reduces component count and calibration drift. |
Use Scenario: Portable ECG monitor acquiring lead-II differential signals at 1ksps with baseline wander rejection. IC Role / Device Role / Timing Role: High-accuracy, low-noise ADC capturing biopotential waveforms with programmable bipolar input range. Use Value: ±0.5 LSB INL and 73dB SINAD ensure diagnostic-grade waveform fidelity; differential mode rejects common-mode interference from AC mains. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
Use Scenario: Handheld multimeter measuring DC voltage, current, and resistance with autoranging and hold function. IC Role / Device Role / Timing Role: Core measurement engine performing rapid successive conversions across multiple input ranges and configurations. Use Value: 133ksps sampling and 15-cycle conversion time support fast display updates; software-selectable unipolar/bipolar mode simplifies firmware for dual-quadrant measurements. |
Use Scenario: DIN-rail mounted PLC analog input module monitoring 4–20mA current loops and thermocouple signals in factory automation. IC Role / Device Role / Timing Role: Isolated front-end ADC interfacing with signal conditioning circuitry and microcontroller via SPI. Use Value: SPI compatibility enables deterministic communication with real-time OS; 8-channel mux reduces per-channel cost vs. discrete ADCs; robust input protection handles field wiring faults. |
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 |
|---|---|---|---|
| MAX147AEPP | Wider supply range (+2.7V to +5.25V); requires external reference; no internal VREF. | Better suited for mixed-voltage systems or when precise external reference (e.g., REF5025) is already present. | Select MAX147AEPP only if system uses >3.6V supply or demands tighter reference accuracy than MAX146AEPP's internal 2.5V ±0.8%. |
| ADS7822U | 12-bit, 200ksps, SPI-only interface; no internal reference; 2.7V–5.25V supply; smaller MSOP-8 package. | Targeted at space-constrained, high-speed single-channel applications-not 8-channel or low-power standby use cases. | Choose ADS7822U for compact, single-input designs where channel count and ultra-low shutdown current are secondary to speed and footprint. |
Compared with MAX147AEPP, MAX146AEPP saves BOM cost and layout area by integrating the reference, while ADS7822U trades channel count and power efficiency for size and raw speed-making MAX146AEPP optimal for multi-sensor, battery-operated systems requiring self-contained accuracy.
Availability
MAX146AEPP is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for MAX146AEPP 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 MAX146/MAX147 family was designed for low-power, multi-channel data acquisition in portable and embedded systems-emphasizing integrated functionality, supply flexibility, and ease of microcontroller interfacing without external support components.
FAQ
What is the operating temperature range for MAX146AEPP?
The MAX146AEPP is specified for 0°C to +70°C ambient operation, matching the "A" grade temperature range defined in the Maxim datasheet. This range is validated for all electrical parameters including INL (±0.5 LSB), supply current (1.2mA typical at 133ksps), and reference accuracy (2.500V ±0.8%). It is suitable for commercial and industrial indoor environments but not extended-temperature applications.
Does MAX146AEPP require external passive components for stable operation?
Yes, MAX146AEPP requires a 4.7µF capacitor at the VREF pin for internal reference stability and a 0.047µF capacitor at REFADJ for reference buffer compensation. Additionally, a 0.1µF ceramic capacitor is recommended between VDD and DGND, and a 0.1µF capacitor should be placed from each analog input (CHx or COM) to AGND when using high-impedance sources to maintain acquisition integrity.
How does the SHDN pin function in MAX146AEPP?
The SHDN pin on MAX146AEPP provides three distinct operating states: pulled low → full shutdown (≤1µA supply current); left floating → external compensation mode (reference buffer enabled with external RC network at REFADJ); pulled high → internal compensation mode (4.7µF at VREF, 0.047µF at REFADJ). This triple-state control enables flexible power and reference configuration without additional logic.
Can MAX146AEPP perform differential measurements across non-paired channels like CH0 and CH3?
No, MAX146AEPP supports differential measurements only across predefined hardware pairs: CH0/CH1, CH2/CH3, CH4/CH5, and CH6/CH7. The internal analog multiplexer and track/hold architecture do not allow arbitrary channel pairing. Attempting CH0–CH3 differential mode would result in undefined behavior or incorrect conversion due to missing internal switch paths and mismatched input capacitance.
What is the minimum acquisition time required before a valid conversion on MAX146AEPP?
The guaranteed maximum acquisition time (tACQ) for MAX146AEPP is 1.5µs under all conditions, as specified in the datasheet. This value assumes source impedance ≤1kΩ and proper decoupling. For higher source impedances, tACQ increases per tACQ = 9 × (RS + 9kΩ) × 16pF, requiring additional settling time before initiating conversion to avoid gain/offset errors.
MAX146AEPP 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):
- 133k
- 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, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX146AEPP FAQ
1.How can I place an order for MAX146AEPP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX146AEPP 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 MAX146AEPP reliable?
The price and inventory of MAX146AEPP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX146AEPP is usually 5 days.
3.What payment methods are accepted for MAX146AEPP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX146AEPP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX146AEPP?
MAX146AEPP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX146AEPP 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 MAX146AEPP?
For technical support, including MAX146AEPP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX146AEPP requirements.
6.How does Aetrix verify that MAX146AEPP is sourced from the original manufacturer or authorized distributors?
All MAX146AEPP 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 MAX146AEPP meets industry standards.
7.What is the process for return or replacement of MAX146AEPP?
All MAX146AEPP units undergo pre-shipment inspection (PSI). If there is an issue with MAX146AEPP, 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 MAX146AEPP part is unused and in its original packaging.
Return procedure for MAX146AEPP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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