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Analog Devices Inc./Maxim Integrated MAX1148BEUP+
- Part No.:
- MAX1148BEUP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
MAX1148BEUP+.pdf
- Description:
- IC ADC 14BIT SAR 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,940
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Product details
Overview
MAX1148BEUP+ from Maxim Integrated is a 14-bit, 8-channel single-ended or 4-channel differential analog-to-digital converter (ADC) with internal track/hold, +4.096V reference, and SPI/QSPI/MICROWIRE-compatible serial interface. It operates from a single +4.75V to +5.25V supply, delivers 116ksps throughput, and supports software-configurable unipolar/bipolar input modes - ideal for portable data logging and battery-powered medical instrumentation.
For engineers reviewing the MAX1148BEUP+ datasheet, MAX1148BEUP+ pinout, MAX1148BEUP+ application, or MAX1148BEUP+ equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts, and supply-chain support for industrial and embedded OEM deployments.
Technical Context
The MAX1148BEUP+ uses successive-approximation architecture with true-differential input multiplexer and dual T/H capacitors. Conversion timing is synchronized either by internal 2.1MHz clock or external SCLK (up to 2.1MHz), requiring 18 clock cycles per 14-bit result in external mode.
Its analog front-end supports flexible channel selection via 3-bit SEL inputs, configurable SGL/DIF and UNI/BIP modes, and two software power-down states (fast: 120µA; full: 300nA). The internal +4.096V reference exhibits ±40ppm/°C tempco over –40°C to +85°C, and REFADJ allows disabling the bandgap buffer when using external references.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit - delivers 16,384 distinct output codes for high-fidelity signal digitization in precision measurement systems. |
| Input Channels | 8 single-ended or 4 differential - enables multi-sensor monitoring without external MUX, reducing BOM and layout complexity. |
| Throughput Rate | 116ksps (external clock) - supports real-time sampling of fast transients up to ~2MHz full-power bandwidth. |
| INL / DNL | ±2 LSB / ±0.5 LSB max - ensures monotonicity and <0.012% full-scale linearity error across temperature for calibrated systems. |
| Supply Current | 1.1mA at 116ksps, 12µA at 1ksps - enables adaptive power scaling in energy-constrained portable instruments. |
| Reference Voltage | +4.096V internal - matches common 12-bit DAC full-scale ranges and simplifies gain calibration in 16-bit system designs. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive-adjacent environments without derating. |
Pinout & Package
MAX1148BEUP+ is housed in a 20-pin TSSOP (U20-3) package with exposed pad for thermal performance. Pin 1 is CH0; pins 5–8 are no-connect; AGND (Pin 13) and DGND (Pin 14) must be separated and joined at a single point near the device.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CH0–CH7 (Pins 1–4, 5–8 NC) | Analog input channels | Supports 8-channel single-ended or 4-channel differential acquisition; CH4–CH7 available only on MAX1148/MAX1149 variants. |
| COM (Pin 9) | Common-mode reference | Sets zero-code voltage: AGND for unipolar, VREF/2 for bipolar mode - critical for accurate offset calibration. |
| SHDN (Pin 10) | Active-low shutdown control | Pulling low reduces supply current to ≤0.3µA; automatic wake-up occurs on CS/SCLK activity - eliminates external reset sequencing. |
| REF (Pin 11) | Reference buffer output / ADC reference input | Provides stable +4.096V (MAX1148BEUP+) or accepts 1.5V–VDD external reference - enables ratiometric or absolute measurement flexibility. |
| DOUT (Pin 15) | Serial data output | MSB-first 14-bit result clocked on SCLK falling edge; high-impedance when CS high - allows daisy-chaining multiple devices. |
| SSTRB (Pin 16) | Serial strobe output | Signals conversion start/end: low during conversion in internal clock mode; pulses high before MSB in external mode - synchronizes DSP capture timing. |
Key Features
| Feature | Design Value |
|---|---|
| True-differential input architecture | Rejects common-mode noise up to 85dB between channels - essential for ECG and sensor bridge measurements in noisy environments. |
| Software-configurable input modes | Single-ended/differential and unipolar/bipolar selection via control byte - eliminates hardware jumpers and enables runtime reconfiguration. |
| Three-tier power management | Normal (1.1mA), fast power-down (120µA), full shutdown (300nA) - extends battery life in intermittent-sampling applications like environmental monitors. |
| Internal 2.1MHz clock + external clock option | Removes need for external oscillator; external SCLK up to 2.1MHz allows precise system-level timing alignment with host processor clocks. |
| Channel-to-channel matching | ±1 LSB gain/offset matching - enables high-accuracy differential measurements without per-channel calibration. |
Applications
| Portable Data Logging | Medical Instrumentation |
|---|---|
Use Scenario: Battery-powered field recorder capturing temperature, pressure, and humidity from 8 sensors at 10ksps. IC Role / Device Role / Timing Role: Primary ADC acquiring synchronized multi-channel analog data with internal reference stability and low quiescent current. Use Value: 12µA at 1ksps operation extends AA battery life to >2 years; 8-channel integration reduces PCB area by 30% vs. dual 4-channel alternatives. |
Use Scenario: Portable ECG monitor digitizing lead-II differential signals with baseline drift compensation. IC Role / Device Role / Timing Role: Precision front-end ADC providing true-differential input, programmable gain path, and bipolar mode for ±2.048V range. Use Value: ±1 LSB channel matching ensures accurate differential voltage subtraction; COM pin flexibility supports right-leg drive feedback implementation. |
| Battery-Powered Instruments | Process Control Sensors |
Use Scenario: Handheld multimeter measuring DC voltage, current, and resistance with autoranging. IC Role / Device Role / Timing Role: Core measurement ADC supporting unipolar 0–4.096V and bipolar ±2.048V ranges via COM pin configuration. Use Value: Internal +4.096V reference eliminates external precision reference IC, cutting BOM cost by $0.35 and saving 2mm² board space. |
Use Scenario: Industrial 4–20mA loop-powered transmitter digitizing thermocouple and RTD signals. IC Role / Device Role / Timing Role: Isolated-side ADC interfacing to sigma-delta modulator outputs or conditioned sensor bridges. Use Value: 116ksps throughput supports oversampling for 16-bit effective resolution; SPI interface simplifies isolation barrier design with digital-only coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel, 14-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8688IPWR | 8-channel, SAR ADC with integrated PGA (±10.24V range), 1 MSPS, 1.8V/3.3V I/O, no internal reference | Requires external reference and level-shifting for 5V systems; higher speed but larger package (TSSOP-32) | Choose for wider input range and programmable gain; avoid if 5V-only interface or minimal footprint is required. |
| AD7928BRUZ | 8-channel, 12-bit SAR ADC, 1MSPS, +2.5V internal reference, SPI-compatible, 20-TSSOP | Lower resolution (12-bit), no bipolar mode, fixed 2.5V ref - lacks unipolar/bipolar configurability and 14-bit precision | Choose for cost-sensitive, lower-precision applications where 12-bit resolution suffices and bipolar operation is unnecessary. |
Compared with ADS8688IPWR and AD7928BRUZ, the MAX1148BEUP+ uniquely combines 14-bit resolution, software-selectable unipolar/bipolar operation, internal +4.096V reference, and 20-pin TSSOP packaging - making it optimal for space-constrained, battery-operated precision instruments needing flexible analog input configuration.
Availability
MAX1148BEUP+ is available at Aetrix Electronics and suitable for portable data logging, medical instrumentation, and battery-powered instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1148BEUP+ 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 industrial, medical, and communications applications.
The MAX1146–MAX1149 family was engineered for low-power, multichannel data acquisition in portable and remote sensing systems - emphasizing integrated references, flexible input architectures, and SPI-compatible serial interfaces to reduce system-level design effort.
FAQ
What is the maximum sampling rate of the MAX1148BEUP+?
The MAX1148BEUP+ achieves a maximum throughput rate of 116ksps in external clock mode with an 2.1MHz SCLK and 18 clock cycles per conversion. In internal clock mode, it operates at a fixed 116ksps rate. This throughput supports full-power bandwidth up to 2.0MHz and small-signal bandwidth of 3.0MHz, enabling accurate digitization of fast transients in portable instrumentation and sensor monitoring systems using the MAX1148BEUP+.
Does the MAX1148BEUP+ support both unipolar and bipolar input configurations?
Yes, the MAX1148BEUP+ supports both unipolar and bipolar input modes via the UNI/BIP bit (bit 2) in its 8-bit control byte. In unipolar mode (UNI/BIP = 1), the input range is 0 to VREF with COM tied to AGND. In bipolar mode (UNI/BIP = 0), the range is ±VREF/2 with COM tied to VREF/2. This configurability is implemented entirely in software - no hardware changes are needed to switch modes on the MAX1148BEUP+.
What is the function of the SSTRB pin on the MAX1148BEUP+?
The SSTRB (serial strobe) pin on the MAX1148BEUP+ provides timing synchronization for host processors. In internal clock mode, SSTRB goes low at conversion start and high at completion. In external clock mode, it pulses high for two SCLK periods just before the MSB of the 14-bit result is shifted out on DOUT. This signal eliminates the need for polling or fixed delays when interfacing the MAX1148BEUP+ with DSPs or microcontrollers requiring precise data capture windows.
Can the MAX1148BEUP+ operate with an external reference voltage?
Yes, the MAX1148BEUP+ accepts an external reference voltage applied to the REF pin, ranging from 1.5V to VDD. When using an external reference, the internal +4.096V bandgap reference is disabled by pulling REFADJ high to VDD. This flexibility allows the MAX1148BEUP+ to support ratiometric measurements (e.g., with bridge sensors) or absolute accuracy requirements beyond the tolerance of the internal reference - all while retaining full functionality of the MAX1148BEUP+'s 14-bit conversion engine.
What power-down modes does the MAX1148BEUP+ support, and how do they affect supply current?
The MAX1148BEUP+ supports two software-controlled power-down modes selected via PD1/PD0 bits: fast power-down (120µA typical) and full power-down (300nA typical). Both modes retain register state and allow automatic wake-up on serial interface activity. Additionally, the SHDN pin provides hardware shutdown (<0.3µA). These low-current states enable aggressive power gating between conversions in battery-powered applications - for example, the MAX1148BEUP+ draws only 12µA at 1ksps, extending operational life in portable data loggers.
MAX1148BEUP+ 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1148BEUP+ FAQ
1.How can I place an order for MAX1148BEUP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1148BEUP+ 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 MAX1148BEUP+ reliable?
The price and inventory of MAX1148BEUP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1148BEUP+ is usually 5 days.
3.What payment methods are accepted for MAX1148BEUP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1148BEUP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1148BEUP+?
MAX1148BEUP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1148BEUP+ 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 MAX1148BEUP+?
For technical support, including MAX1148BEUP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1148BEUP+ requirements.
6.How does Aetrix verify that MAX1148BEUP+ is sourced from the original manufacturer or authorized distributors?
All MAX1148BEUP+ 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 MAX1148BEUP+ meets industry standards.
7.What is the process for return or replacement of MAX1148BEUP+?
All MAX1148BEUP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1148BEUP+, 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 MAX1148BEUP+ part is unused and in its original packaging.
Return procedure for MAX1148BEUP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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