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Analog Devices Inc./Maxim Integrated MAX146BCPP
- Part No.:
- MAX146BCPP
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX146BCPP.pdf
- Description:
- IC ADC 12BIT SAR 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,762
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Product details
Overview
The MAX146BCPP from Maxim Integrated is a 12-bit, 8-channel serial analog-to-digital converter (ADC) with integrated track/hold, multiplexer, and internal 2.5V reference. It operates from a single +2.7V to +3.6V supply, achieves 133ksps conversion rate using external 2MHz clock, and supports software-configurable unipolar/bipolar and single-ended/differential inputs. It targets portable data loggers and battery-powered medical instruments requiring low-power precision digitization.
For engineers reviewing the MAX146BCPP datasheet, MAX146BCPP pinout, MAX146BCPP application, or MAX146BCPP equivalent, key selection considerations include its 20-pin PDIP package, ±0.5 LSB INL, 1.2mA active current at 133ksps, and SPI/QSPI/MICROWIRE-compatible 4-wire serial interface with SSTRB strobe for TMS320 DSP interfacing.
Technical Context
The MAX146BCPP employs successive-approximation architecture with a capacitive DAC and internal track/hold circuitry. Its analog input stage supports pseudo-differential sampling via CH0–CH7 and COM pins, with acquisition time of 1.5µs and full-power bandwidth of 65kHz.
It features dual clocking modes: internal oscillator or external serial clock (up to 2MHz), and includes a hard-wired SHDN pin plus software-selectable power-down. The internal 2.5V reference has ±30ppm/°C tempco and ±1.5% adjustment range via REFADJ pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for high-fidelity signal representation in sensor and instrumentation applications. |
| INL (Integral Nonlinearity) | ±0.5 LSB - ensures monotonicity and ≤0.012% full-scale error after calibration, critical for precision measurement systems. |
| Conversion Rate | 133ksps - enables real-time sampling of audio-band and control-loop signals without aliasing when paired with anti-alias filtering. |
| Supply Current (Active) | 1.2mA at 3V/133ksps - allows continuous operation in handheld devices with typical 3.3V LDO supplies and <100mA total system budget. |
| Reference Voltage | 2.500V ±20mV (TYP) - stable internal reference eliminates need for external precision voltage source, reducing BOM count and layout complexity. |
| Input Configuration | 8-channel SE or 4-channel differential - provides flexible signal routing for multi-sensor arrays or bridge-based transducer interfaces. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded systems including industrial HMI and portable test equipment. |
Pinout & Package
MAX146BCPP is housed in a 20-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–8) | Analog input channels | Accept single-ended or differential voltage inputs; each channel must be referenced to COM and remain stable within ±0.5 LSB during conversion. |
| COM (Pin 9) | Analog common reference | Sets zero-code voltage in single-ended mode; must be decoupled and held stable to ±0.5 LSB for accurate conversions. |
| SHDN (Pin 10) | Three-level shutdown control | Pull low for full power-down (1µA), float for external compensation mode, or pull high for internal compensation-enables dynamic reference tuning. |
| VREF (Pin 11) | Reference buffer output / ADC reference input | Provides 2.500V nominal output (MAX146 only); used directly as ADC reference unless external reference is applied and REFADJ tied to VDD. |
| REFADJ (Pin 12) | Reference buffer adjustment input | Allows ±1.5% fine-tuning of VREF; tie to VDD to disable internal reference buffer when using external reference (not applicable to MAX146BCPP). |
| DOUT (Pin 15) | Serial data output | Outputs 12-bit conversion result MSB-first on SCLK falling edge; high-impedance when CS is high-enables bus sharing. |
| AGND (Pin 13), DGND (Pin 14) | Analog and digital ground returns | Must be connected at single point near device; separation prevents digital noise from corrupting analog measurements. |
| SCLK (Pin 19), DIN (Pin 17), CS (Pin 18), SSTRB (Pin 16) | Serial interface control signals | Support SPI/QSPI/MICROWIRE protocols; SSTRB provides hardware strobe synchronized to conversion start/end for deterministic DSP timing. |
| VDD (Pin 20) | Positive supply | Accepts +2.7V to +3.6V; requires local 4.7µF + 0.1µF bypassing at VREF and VDD pins to maintain reference stability and PSR >70dB. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2.5V reference with ±1.5% adjustability | Eliminates external reference IC and trimming components; REFADJ pin enables field calibration without hardware change. |
| Software-configurable unipolar/bipolar and SE/differential inputs | Single control byte selects input mode per conversion-supports mixed-signal acquisition (e.g., thermocouple + RTD) without external mux reconfiguration. |
| 4-wire SPI/QSPI/MICROWIRE interface with SSTRB strobe | Direct connection to TMS320-family DSPs without glue logic; SSTRB pulse aligns firmware ISR execution precisely with conversion completion. |
| Track/hold acquisition time of 1.5µs | Enables accurate sampling of fast transients up to 65kHz full-power bandwidth; compatible with source impedances ≤1kΩ without external RC filtering. |
| Three power-down modes (full, fast, auto-shutdown) | Reduces supply current to 1µA in full shutdown; auto-shutdown after conversion cuts average current to <60µA at 1ksps-extends battery life in intermittent logging. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental monitor recording temperature, humidity, and pressure over 72-hour deployments. IC Role / Device Role / Timing Role: Primary ADC acquiring 8 analog sensor outputs sequentially at 100Hz with automatic power-down between samples. Use Value: 1.2mA active current and 1µA shutdown current enable >12-month battery life on two AA cells; internal reference ensures consistent accuracy across temperature drift. |
Use Scenario: Handheld ECG front-end digitizing lead-II differential signals with baseline wander correction. IC Role / Device Role / Timing Role: Precision 12-bit ADC configured for bipolar differential mode on CH0/CH1 pair, synchronized to programmable sample rate. Use Value: ±0.5 LSB INL and 73dB SINAD preserve diagnostic waveform fidelity; COM pin stability requirement ensures accurate common-mode rejection. |
| Battery-Powered Test Equipment | Industrial Process Monitoring |
Use Scenario: Pocket-sized multimeter measuring DC voltage, resistance, and diode drop with autoranging. IC Role / Device Role / Timing Role: Configurable ADC supporting both unipolar (voltage) and bipolar (current loop) inputs via software control byte. Use Value: Single-supply +2.7V operation eliminates negative rail generation; 8-channel mux reduces external component count for multi-function sensing. |
Use Scenario: DIN-rail mounted PLC analog input module acquiring 4x 4–20mA transmitter outputs and 4x thermocouple inputs. IC Role / Device Role / Timing Role: Dual-role ADC handling differential thermocouple pairs and single-ended current sense resistors in time-multiplexed sequence. Use Value: Internal reference and ±0.5 LSB INL meet IEC 61000-4-5 surge immunity requirements for industrial environments; 20-pin DIP simplifies conformal coating and repairability. |
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, SPI-only interface, no internal reference, requires external 2.5V ref and separate power-down control. | Lacks SSTRB strobe and REFADJ adjustability; better suited for fixed-reference, high-speed systems with dedicated SPI master. | Select when higher throughput (200ksps) is required and board space allows external reference; not drop-in due to missing VREF/REFADJ pins. |
| MAX11131AUT+T | 12-bit, 500ksps, internal reference, SPI/QSPI compatible, 10-pin µDFN package, no COM pin or differential channel pairing. | Optimized for space-constrained designs; lacks pseudo-differential architecture and COM-referenced flexibility for legacy sensor interfaces. | Choose for compact, high-density layouts where 8-channel SE suffices and thermal performance permits µDFN; incompatible pinout and control protocol. |
Compared with ADS7822U and MAX11131AUT+T, the MAX146BCPP uniquely combines internal reference adjustability, COM-referenced pseudo-differential sampling, and SSTRB hardware synchronization-making it optimal for battery-powered instrumentation requiring field calibration and deterministic DSP timing.
Availability
MAX146BCPP 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 obsolescence management.
Supply support for MAX146BCPP 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 series belongs to Maxim's precision data acquisition product line, designed specifically for low-power, single-supply, multi-channel ADC applications in portable and embedded systems where size, power, and accuracy are jointly constrained.
FAQ
What is the operating voltage range for the MAX146BCPP?
The MAX146BCPP operates from a single +2.7V to +3.6V supply. This range supports direct connection to common 3.3V LDO regulators and ensures compatibility with lithium-ion battery discharge profiles down to 2.7V. Operation outside this range may cause permanent damage per absolute maximum ratings.
Does the MAX146BCPP require an external reference voltage?
No, the MAX146BCPP includes an internal 2.5V reference buffer with ±1.5% adjustment range via the REFADJ pin. External reference is optional and only needed if tighter initial accuracy or different voltage level is required; applying external reference disables the internal buffer when REFADJ is tied to VDD.
How many analog input channels does the MAX146BCPP support?
The MAX146BCPP supports eight analog input channels (CH0–CH7), configurable either as eight single-ended inputs referenced to COM or as four differential pairs (CH0/CH1, CH2/CH3, CH4/CH5, CH6/CH7). Channel selection and mode are controlled by an 8-bit software-configurable command byte.
What serial interface protocols is the MAX146BCPP compatible with?
The MAX146BCPP supports SPI™, QSPI™, and MICROWIRE™ protocols via its 4-wire serial interface (SCLK, DIN, DOUT, CS). It requires CPOL = 0 and CPHA = 0 for SPI compatibility and includes SSTRB strobe output for precise timing alignment with TMS320-family DSPs.
What is the maximum conversion rate of the MAX146BCPP?
The MAX146BCPP achieves a maximum conversion rate of 133ksps when using a 2MHz external serial clock and 15 clock cycles per conversion. In internal clock mode, the rate drops to approximately 100ksps. The actual achievable rate depends on SCLK frequency, control byte setup, and acquisition timing constraints.
MAX146BCPP 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
MAX146BCPP FAQ
1.How can I place an order for MAX146BCPP through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX146BCPP 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 MAX146BCPP reliable?
The price and inventory of MAX146BCPP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX146BCPP is usually 5 days.
3.What payment methods are accepted for MAX146BCPP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX146BCPP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX146BCPP?
MAX146BCPP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX146BCPP 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 MAX146BCPP?
For technical support, including MAX146BCPP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX146BCPP requirements.
6.How does Aetrix verify that MAX146BCPP is sourced from the original manufacturer or authorized distributors?
All MAX146BCPP 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 MAX146BCPP meets industry standards.
7.What is the process for return or replacement of MAX146BCPP?
All MAX146BCPP units undergo pre-shipment inspection (PSI). If there is an issue with MAX146BCPP, 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 MAX146BCPP part is unused and in its original packaging.
Return procedure for MAX146BCPP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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