My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX146BEAP+
- Part No.:
- MAX146BEAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX146BEAP+.pdf
- Description:
- IC ADC 12BIT SAR 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,683
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX146BEAP+ 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 interface. It operates from a single +2.7V to +3.6V supply, consumes only 1.2mA at 133ksps, and supports portable data logging and battery-powered instrumentation.
For engineers reviewing the MAX146BEAP+ datasheet, MAX146BEAP+ pinout, MAX146BEAP+ application, or MAX146BEAP+ equivalent, key selection considerations include its 20-pin SSOP package, ±0.5 LSB INL, 1.5µs acquisition time, shutdown current <1µA, and compatibility with TMS320-family DSPs via SSTRB strobe output.
Technical Context
The MAX146BEAP+ uses successive-approximation architecture with a capacitive DAC and internal track/hold circuitry. Its analog input sampling is controlled by an 8-bit command byte defining channel, polarity, mode (single-ended/differential), and clock source (internal/external).
It features dual power-down modes-full power-down (1µA) and fast power-down (54µA at 1ksps)-and automatic wake-on-CS activation. The internal reference buffer provides ±1.5% adjustment range and ±30ppm/°C temperature coefficient over 0°C to +70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.244mV (with 2.5V reference), sufficient for precision sensor digitization in medical and industrial instruments. |
| INL (Integral Nonlinearity) | ±0.5 LSB max - ensures monotonicity and ≤0.012% full-scale error, critical for closed-loop control accuracy. |
| Conversion Rate | 133ksps (external 2MHz clock) - supports real-time sampling of signals up to ~65kHz bandwidth (−3dB point). |
| Supply Current | 1.2mA @ 133ksps, 3V - enables continuous operation in low-power embedded systems without thermal derating. |
| Shutdown Current | 1µA - allows microcontroller-governed duty-cycled acquisition to extend battery life in portable devices. |
| Reference | Internal 2.500V ±0.8% (25°C), ±1.5% adjustable via REFADJ - eliminates need for external reference IC in space-constrained designs. |
| Input Configuration | 8-channel single-ended OR 4-channel differential - provides flexibility for mixed-signal front-end design without external multiplexers. |
Pinout & Package
MAX146BEAP+ is housed in a 20-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, RoHS-compliant, and rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Support software-selectable single-ended (vs. COM) or differential (paired CHx/CHy) acquisition; input protection clamps ±0.3V beyond rails. |
| COM (Pin 9) | Common-mode reference | Sets zero-code voltage in single-ended mode; must be stable to ±0.5 LSB; connects to AGND or mid-reference as needed. |
| SHDN (Pin 10) | Three-level shutdown control | Low = full shutdown (1µA); high = internal compensation mode; float = external compensation mode - enables flexible power management. |
| VREF (Pin 11) | Reference buffer output / ADC reference input | Delivers 2.500V nominal (MAX146 only); bypassed with 4.7µF capacitor for internal compensation; disabled when REFADJ = VDD. |
| REFADJ (Pin 12) | Reference buffer gain adjust | Allows ±1.5% fine-tuning of VREF; tied to VDD to disable internal reference - essential for calibration-critical applications. |
| DOUT (Pin 15) | Serial data output | MSB-first, clocked on SCLK falling edge; high-impedance when CS = high - enables bus sharing with other SPI peripherals. |
| SSTRB (Pin 16) | Serial strobe output | Pulses high one SCLK cycle before MSB in external clock mode; asserts low during conversion in internal mode - synchronizes DSP capture timing. |
| CS (Pin 18) | Active-low chip select | Enables serial interface and powers up device; DOUT goes high-Z when CS = high - prevents bus contention in multi-device systems. |
| SCLK (Pin 19) | Serial clock input | Drives data transfer and (in external mode) sets conversion speed; 40–60% duty cycle required - compatible with standard MCU SPI peripherals. |
| VDD (Pin 20) | Positive supply | +2.7V to +3.6V only - incompatible with 5V logic; requires local 3.3V LDO or DC-DC regulator with low noise and adequate decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended/differential and unipolar/bipolar selection via 8-bit control byte - eliminates hardware jumpers and simplifies firmware-driven sensor reconfiguration. |
| Integrated reference buffer | 2.500V ±0.8% output with ±1.5% adjustment range and 0.35mV load regulation - reduces BOM count and layout area vs. discrete reference + op-amp solutions. |
| Low-power conversion sequencing | Automatic wake-on-CS and sub-µA shutdown - enables energy-proportional sampling where each conversion is triggered only when data is needed. |
| TMS320-family DSP interface support | Dedicated SSTRB output synchronized to conversion start/end - removes need for polling or timer-based synchronization in real-time signal processing. |
| High-accuracy analog front-end | ±0.5 LSB INL, ±0.5 LSB DNL, 73dB SINAD at 10kHz - meets requirements for Class I medical instrumentation and precision process monitoring. |
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 acquiring 8 analog sensor outputs sequentially with programmable sample rate and auto-shutdown between readings. Use Value: 1.2mA active current and 1µA shutdown enable >1-year battery life on two AA cells; internal reference eliminates calibration drift across temperature. |
Use Scenario: Handheld ECG monitor digitizing biopotential signals from multiple leads. IC Role / Device Role / Timing Role: High-fidelity analog front-end ADC supporting differential lead measurements with low offset matching (<0.25 LSB) and low crosstalk (−88dB). Use Value: ±0.5 LSB INL and 73dB SINAD ensure diagnostic-grade waveform fidelity; 20-pin SSOP fits compact PCB layouts. |
| Battery-Powered Test Equipment | Industrial Process Control |
Use Scenario: Portable multimeter measuring DC voltage, current, and resistance with autoranging. IC Role / Device Role / Timing Role: Core measurement ADC handling bipolar ±2.5V inputs and unipolar 0–2.5V ranges via software configuration. Use Value: Single-supply +2.7V to +3.6V operation matches Li-ion battery discharge curve; REFADJ allows factory trim for absolute accuracy. |
Use Scenario: PLC analog input module conditioning 4–20mA loop signals and thermocouple outputs. IC Role / Device Role / Timing Role: Multi-channel acquisition engine with channel-to-channel gain/offset matching (<0.25 LSB) for consistent channel calibration. Use Value: 8-channel integration reduces component count per channel; 0°C to +70°C rating supports industrial ambient conditions. |
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 | 12-bit, 200ksps, +2.7V to +5.25V supply, no internal reference, requires external REF. | Higher speed but lacks integrated reference and shutdown control - needs additional components for battery-powered use. | Select when higher throughput (>133ksps) is required and board space allows external reference + LDO. |
| MAX11131ETE+ | 12-bit, 500ksps, +2.7V to +3.6V, internal reference, SPI-only (no MICROWIRE/QSPI), 16-pin TQFN. | Faster and smaller package, but lacks SSTRB output and 3-level SHDN - limits DSP interfacing and ultra-low-power sequencing. | Select for space-constrained, high-throughput applications where TQFN assembly is feasible and DSP sync is not required. |
Compared with ADS7822U and MAX11131ETE+, the MAX146BEAP+ uniquely combines internal reference, three-level shutdown, SSTRB strobe, and MICROWIRE/SPI/QSPI/TMS320 compatibility in a 20-pin SSOP - making it optimal for legacy-compatible, low-power, DSP-coupled designs.
Availability
MAX146BEAP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered test equipment requiring stable component supply and long-term production continuity.
Supply support for MAX146BEAP+ 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 MAX146BEAP+ belongs to Maxim's precision data-acquisition product line, designed specifically for low-power, multi-channel, single-supply ADC applications in portable and embedded systems where size, power, and interface flexibility are critical.
FAQ
What is the operating temperature range for MAX146BEAP+?
The MAX146BEAP+ is specified for 0°C to +70°C ambient operation. This commercial-grade temperature range aligns with its BEAP+ suffix and is validated across all electrical parameters including INL, gain error, and reference stability. For extended-range alternatives, consider the MAX146CEAP+ (0°C to +70°C, tighter initial accuracy) or MAX146EEAP+ (−40°C to +85°C).
Does MAX146BEAP+ require an external reference?
No, the MAX146BEAP+ includes an internal 2.500V reference buffer with ±1.5% adjustment range via REFADJ. External reference is only required for the MAX147 variant. Using the internal reference simplifies design, reduces component count, and maintains ±0.8% output accuracy at 25°C - confirmed in the Electrical Characteristics table under "VREF Output Voltage".
Can MAX146BEAP+ interface directly with a TMS320C2xx DSP?
Yes, the MAX146BEAP+ supports direct connection to TMS320-family DSPs via its dedicated SSTRB (serial strobe) output. In internal clock mode, SSTRB goes low at conversion start and high at completion; in external mode, it pulses high one SCLK cycle before MSB output - enabling hardware-triggered DMA capture without CPU intervention.
What is the minimum acquisition time for MAX146BEAP+?
The guaranteed maximum acquisition time (tACQ) for MAX146BEAP+ is 1.5µs under typical conditions (VDD = 3.0V, fSCLK = 2MHz). This value is derived from the internal track/hold circuit's RC time constant and is independent of input source impedance below 1kΩ - ensuring reliable settling for most sensor interfaces without added external buffering.
How does the SHDN pin function on MAX146BEAP+?
The SHDN pin on MAX146BEAP+ implements three distinct states: pulled low → full shutdown (1µA); pulled high → internal compensation mode (4.7µF at VREF); left floating → external compensation mode (0.047µF at REFADJ). This triple-state control enables precise power management and reference configuration without additional GPIOs or external logic.
MAX146BEAP+ 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):
- 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-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX146BEAP+ FAQ
1.How can I place an order for MAX146BEAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX146BEAP+ 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 MAX146BEAP+ reliable?
The price and inventory of MAX146BEAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX146BEAP+ is usually 5 days.
3.What payment methods are accepted for MAX146BEAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX146BEAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX146BEAP+?
MAX146BEAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX146BEAP+ 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 MAX146BEAP+?
For technical support, including MAX146BEAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX146BEAP+ requirements.
6.How does Aetrix verify that MAX146BEAP+ is sourced from the original manufacturer or authorized distributors?
All MAX146BEAP+ 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 MAX146BEAP+ meets industry standards.
7.What is the process for return or replacement of MAX146BEAP+?
All MAX146BEAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX146BEAP+, 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 MAX146BEAP+ part is unused and in its original packaging.
Return procedure for MAX146BEAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX146BEAP+ 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…
