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Analog Devices Inc./Maxim Integrated MAX1148BCUP+
- Part No.:
- MAX1148BCUP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1148BCUP+.pdf
- Description:
- IC ADC 14BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,836
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Product details
Overview
MAX1148BCUP+ from Maxim Integrated is a 14-bit, 8-channel single-ended or 4-channel differential analog-to-digital converter (ADC) with integrated track/hold, internal +4.096V reference, and SPI/QSPI/MICROWIRE-compatible serial interface. It operates from a single +4.75V to +5.25V supply, achieves 116ksps throughput, and supports software-configurable unipolar/bipolar input modes - used in portable data loggers for high-accuracy sensor digitization under battery-constrained conditions.
For engineers reviewing the MAX1148BCUP+ datasheet, MAX1148BCUP+ pinout, MAX1148BCUP+ application, or MAX1148BCUP+ equivalent, this page delivers verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternative parts with documented differences, and supply-chain support tailored for industrial embedded and medical instrumentation design.
Technical Context
The MAX1148BCUP+ employs successive-approximation register (SAR) architecture with true-differential analog input stage and on-chip track/hold circuitry. Its multiplexer supports dynamic channel selection via 3-bit address (SEL2–SEL0) in the control byte, enabling per-conversion reconfiguration of input mode (single-ended/differential), polarity (unipolar/bipolar), and power-down state (full/fast/internal/external clock).
Conversion timing is synchronized either to an internal 2.1MHz clock or an external serial clock up to 2.1MHz; acquisition time is fixed at 1.4µs with 3 SCLK cycles allocated for T/H settling. The device uses two switched-capacitor DACs and a comparator to resolve 14-bit codes in 15 clock cycles, delivering ±2 LSB INL and 81dB SINAD at 1kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 discrete output codes for high-fidelity signal capture in precision measurement systems. |
| Sampling Rate | 116ksps - enables real-time monitoring of fast transients in medical ECG front-ends or process control loop feedback. |
| Input Channels | 8 single-ended or 4 differential - supports multi-sensor arrays without external MUX, reducing BOM and layout complexity. |
| Reference Voltage | +4.096V internal - provides exact 1mV/LSB scaling (4.096V ÷ 2¹⁴) for simplified calibration and direct voltage interpretation. |
| Supply Current | 1.1mA at 116ksps - allows continuous operation in 5V-powered handheld instruments with <10mW total analog power budget. |
| INL Accuracy | ±2 LSB max - ensures monotonicity and <0.012% full-scale error across temperature, critical for closed-loop control accuracy. |
| Interface Protocol | SPI/QSPI/MICROWIRE-compatible - interfaces directly to ARM Cortex-M or Renesas RX microcontrollers without level-shifting or glue logic. |
Pinout & Package
MAX1148BCUP+ is housed in a 20-pin TSSOP package (package code U20-3), 4.4mm × 6.5mm body, 0.65mm pitch, exposed pad not electrically connected. Pin functions are validated per Maxim's official pin description table (Rev 2, Jan 2007).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–4, 5–8) | Analog Input Channels | Eight dedicated single-ended inputs; configurable as four differential pairs (e.g., CH0/CH1) - supports simultaneous multi-point sensing in data acquisition systems. |
| COM (Pin 9) | Common Reference Node | Sets zero-code point: AGND for unipolar mode (0 to +4.096V), VREF/2 for bipolar mode (±2.048V) - eliminates need for external level-shifting circuitry. |
| SHDN (Pin 10) | Active-Low Shutdown Control | Pulling low reduces supply current to 0.3µA - enables microcontroller-driven sleep/wake cycles in battery-powered field instruments. |
| REF (Pin 11) | Reference Buffer Output / ADC Reference Input | Provides stable +4.096V output; accepts external references from 1.5V to VDD - allows system-level reference sharing or higher-precision external sources. |
| DOUT (Pin 15) | Serial Data Output | MSB-first 14-bit result clocked on SCLK falling edge; high-impedance when CS = high - enables daisy-chaining multiple ADCs on shared bus. |
| SSTRB (Pin 16) | Serial Strobe Output | Signals conversion start/end: low during conversion in internal clock mode; pulses high before MSB in external clock mode - synchronizes DSP interrupt handling without polling. |
| DIN (Pin 17) | Serial Data Input | Accepts 8-bit control byte defining channel, mode, and clock/power-down selection - enables runtime reconfiguration without reset. |
| CS (Pin 18) | Chip Select | Active-low enable for serial interface; disables DOUT/SSTRB outputs when high - simplifies isolation in multi-device SPI networks. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Track/Hold + Multiplexer | Eliminates external sample-hold IC and analog switch matrix - reduces board area by >25mm² and avoids inter-channel skew in multi-sensor sampling. |
| Software-Configurable Input Modes | Single-ended/differential and unipolar/bipolar selection per conversion via control byte - enables adaptive signal conditioning for mixed-signal sensor suites (e.g., thermocouples + RTDs). |
| Three Power-Down States | Full power-down (0.3µA), fast power-down (120µA), and internal clock mode - extends battery life in portable data loggers from 8 to >12 months at 10s sampling intervals. |
| True-Differential Architecture | Rejects common-mode noise up to 85dB between channels - maintains accuracy in noisy industrial environments without shielded cabling. |
| Integrated +4.096V Reference | Delivers ±50ppm/°C tempco over –40°C to +85°C - removes need for external reference IC and associated 0.1% trimming resistors. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, and CO₂ every 10 seconds across remote sites. IC Role / Device Role / Timing Role: Primary ADC digitizing 8 sensor outputs with automatic channel sequencing and low-power shutdown between samples. Use Value: 120µA fast power-down current extends 2xAA battery life to 14 months; internal reference eliminates calibration drift over temperature. |
Use Scenario: Portable ECG device acquiring lead I, II, III, aVR, aVL, aVF signals with right-leg drive feedback. IC Role / Device Role / Timing Role: Simultaneous 6-channel differential acquisition at 1ksps using CH0–CH5 with COM tied to driven-right-leg reference. Use Value: ±2 LSB INL and 81dB SINAD ensure diagnostic-grade waveform fidelity; true-differential inputs reject 50/60Hz mains interference. |
| Battery-Powered Instruments | Process Control |
Use Scenario: Handheld multimeter measuring DC voltage, resistance, and diode drop with autoranging and auto-zero. IC Role / Device Role / Timing Role: High-accuracy ADC for primary measurement path, configured per range via software-controlled UNI/BIP and SGL/DIF bits. Use Value: +4.096V reference enables 1mV/LSB resolution; 1.4µs acquisition time supports fast autoranging without settling delays. |
Use Scenario: PLC analog input module digitizing 4–20mA current loops from pressure, flow, and level transmitters. IC Role / Device Role / Timing Role: 8-channel ADC with programmable gain via external op-amp interface, reading isolated current-loop receivers. Use Value: Channel-to-channel gain matching ±1 LSB ensures consistent scaling across all 8 channels; 116ksps supports oversampling for noise reduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, 14-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8684IPWR | 4-channel, 16-bit, +5V supply, integrated PGA (±10.24V range), no internal reference - requires external REF3040. | Higher resolution but fewer channels; better suited for high-dynamic-range single-sensor applications like motor phase current sensing. | Select when 16-bit resolution and programmable gain outweigh need for 8-channel count and internal reference convenience. |
| AD7928BRUZ | 8-channel, 12-bit, +5V supply, no internal reference, 1MSPS max - requires external ADR4540 reference and external T/H. | Higher speed but lower resolution and no integrated T/H/reference - demands more external components and PCB area. | Select when sampling rate >100ksps is mandatory and 12-bit accuracy suffices for cost-sensitive industrial monitoring. |
Compared with MAX1148BCUP+, ADS8684IPWR trades channel count for resolution and PGA flexibility, while AD7928BRUZ sacrifices integration (no T/H, no reference) for raw speed - making MAX1148BCUP+ optimal for compact, low-power, 14-bit multi-sensor systems where component count and supply simplicity are prioritized.
Availability
MAX1148BCUP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered instruments requiring stable component supply, long-term lifecycle assurance, and guaranteed traceability for ISO 13485 and IEC 61508 compliance.
Supply support for MAX1148BCUP+ 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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications applications.
The MAX1146–MAX1149 family was engineered for low-power, multichannel data acquisition in space- and energy-constrained systems - emphasizing integration (T/H, reference, MUX), flexible software configuration, and robust serial interfacing without external support components.
FAQ
What is the operating temperature range for MAX1148BCUP+?
The MAX1148BCUP+ is specified for 0°C to +70°C ambient operation (indicated by the 'BC' suffix in the ordering code). This commercial-grade temperature range suits indoor portable instruments, lab equipment, and non-automotive industrial controls where thermal management is controlled. The device maintains ±2 LSB INL and 116ksps throughput across this full range, with reference tempco limited to ±50ppm/°C.
Does MAX1148BCUP+ require an external crystal or oscillator?
No, MAX1148BCUP+ does not require an external crystal or oscillator. It contains an internal 2.1MHz clock generator usable in internal clock mode (PD1=1, PD0=0). Alternatively, it accepts an external serial clock up to 2.1MHz on the SCLK pin for precise system-level timing synchronization - eliminating BOM cost and board space for timing components.
Can MAX1148BCUP+ interface directly with an STM32 microcontroller?
Yes, MAX1148BCUP+ interfaces directly with STM32 MCUs via hardware SPI: connect SCLK to SCK, DIN to MOSI, DOUT to MISO, CS to NSS, and SHDN to a GPIO. Its SPI/QSPI/MICROWIRE compatibility, 3.3V-tolerant digital inputs (VIH = 2.0V min), and 5V supply allow seamless operation with STM32F4/F7/H7 series without level shifters - verified in Maxim's AN6327 application note.
How does the internal +4.096V reference benefit system design?
The internal +4.096V reference in MAX1148BCUP+ enables exact 1mV/LSB scaling (4.096V ÷ 2¹⁴), simplifying firmware math and eliminating external reference ICs, decoupling capacitors, and trimming resistors. It exhibits ±50ppm/°C tempco over 0°C to +70°C, ensuring <0.035% full-scale drift - critical for portable instruments where calibration stability impacts field service intervals.
What is the minimum acquisition time required before conversion starts?
The MAX1148BCUP+ allocates 1.4µs for track/hold acquisition (tACQ), occurring during the last three SCLK cycles of the 8-bit control byte. This fixed window assumes source impedance ≤2.6kΩ; for higher impedances, a 100pF capacitor from input to AGND or an op-amp buffer (e.g., MAX4430) is required to meet settling within tACQ - confirmed in Figure 6 and Equation on page 12 of the datasheet.
MAX1148BCUP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 14
- Sampling Rate (Per Second):
- 116k
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1148BCUP+ FAQ
1.How can I place an order for MAX1148BCUP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1148BCUP+ 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 MAX1148BCUP+ reliable?
The price and inventory of MAX1148BCUP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1148BCUP+ is usually 5 days.
3.What payment methods are accepted for MAX1148BCUP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1148BCUP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1148BCUP+?
MAX1148BCUP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1148BCUP+ 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 MAX1148BCUP+?
For technical support, including MAX1148BCUP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1148BCUP+ requirements.
6.How does Aetrix verify that MAX1148BCUP+ is sourced from the original manufacturer or authorized distributors?
All MAX1148BCUP+ 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 MAX1148BCUP+ meets industry standards.
7.What is the process for return or replacement of MAX1148BCUP+?
All MAX1148BCUP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1148BCUP+, 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 MAX1148BCUP+ part is unused and in its original packaging.
Return procedure for MAX1148BCUP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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