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Analog Devices Inc./Maxim Integrated MAX1408CAI
- Part No.:
- MAX1408CAI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1408CAI.pdf
- Description:
- 16-BIT MULTICHANNEL DAS
- Quantity:
- Payment:
- Shipping:
Inventory:477
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Product details
Overview
The MAX1408CAI from Maxim Integrated is a low-power, 16-bit sigma-delta multichannel data-acquisition system (DAS) with integrated 10-bit force/sense DACs, RTC, internal 1.25V reference, and SPI-compatible serial interface. It features eight auxiliary analog inputs, differential 8:1 input multiplexer, 30Hz/60Hz continuous conversion rates, ±1.5 LSB INL (typ), and operates from +2.7V to +3.6V supply consuming only 1.03mA in Run mode - ideal for portable medical instrumentation and battery-powered industrial sensors.
For engineers reviewing the MAX1408CAI datasheet, MAX1408CAI pinout, MAX1408CAI application, or MAX1408CAI equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated 28-pin SSOP package mapping, confirmed pin functions including FB1/FB2 feedback terminals and DRDY/INT interrupt outputs, and two rigorously cross-checked alternative DAS ICs for sensor interface and precision monitoring designs.
Technical Context
The MAX1408CAI integrates a fully differential 16-bit sigma-delta ADC with programmable gain (1/3, 1, 2 V/V), unipolar/bipolar mode selection, on-chip offset calibration, and buffered/unbuffered input configurations. Its ADC supports 30Hz or 60Hz continuous conversion with RMS noise as low as ±5 µVRMS (bipolar, gain=2).
It includes two independent 10-bit force/sense DACs with monotonic output, ±1 LSB DNL/INL, 18 V/ms slew rate, and 65 µs settling time. System support functions comprise a 32.768kHz crystal oscillator, 2.4576MHz PLL clock output, RTC valid through year 9999, dual voltage monitors (+1.8V/+2.7V), and active-low wake-up inputs (WU1/WU2) enabling ultra-low-power Sleep mode (2.5µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 16-bit sigma-delta with no missing codes - ensures full dynamic range utilization in high-precision sensor digitization. |
| INL (typ) | ±1.5 LSB in buffered bipolar mode, gain=2 - guarantees linearity critical for calibrated transducer measurements. |
| Conversion Rate | 30Hz or 60Hz continuous - matches mains-frequency rejection requirements in industrial power monitoring. |
| DAC Resolution | 10-bit force/sense with guaranteed monotonicity - enables precise closed-loop sensor excitation without code glitches. |
| Supply Current (Run) | 1.03mA at +2.7V to +3.6V - allows >1-year battery life in AA-powered handheld diagnostic devices. |
| Reference Output | 1.25V ±25mV, 18ppm/°C drift - provides stable full-scale reference for both ADC and DAC without external components. |
| Sleep Current | 2.5µA with RTC, wake-up, and voltage monitor active - supports long-term environmental logging with periodic wake cycles. |
Pinout & Package
MAX1408CAI is housed in a 28-pin SSOP package (5.6mm × 10.2mm, 0.65mm pitch), RoHS-compliant and optimized for space-constrained portable systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN0–IN7 | Eight auxiliary analog inputs | Supports fully differential or pseudo-differential sensor connections; IN0–IN3 routed to both muxes, IN4–IN7 to positive/negative mux separately. |
| FB1 / FB2 | Force/sense DAC feedback inputs | Enables 4-wire Kelvin sensing for precision current-source or voltage-output DAC applications with load compensation. |
| OUT1 / OUT2 | Force/sense DAC outputs | Deliver 0.05V to AVDD–0.2V swing; require external feedback resistors to set gain and output range per application. |
| DRDY / INT | Active-low status outputs | DRDY signals new ADC result availability; INT asserts on PLL ready, alarm, or comparator trip - simplifies interrupt-driven firmware. |
| WU1 / WU2 | Active-low wake-up inputs | Internally pulled up; trigger transition from Sleep to Standby mode with ≥1µs pulse - enables event-driven low-power operation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated RTC with alarm | Valid through year 9999 and programmable alarm - eliminates need for external real-time clock in portable data loggers. |
| Programmable PGA gain | 1/3, 1, or 2 V/V selectable via register - adapts input range to diverse sensor outputs (e.g., thermocouples, strain gauges, RTDs) without external op-amps. |
| On-chip offset calibration | Removes ADC offset error in <50µs - enables rapid zero-point correction during system startup or recalibration sequences. |
| 2.4576MHz PLL clock output | FOUT drives microcontroller clock input directly - reduces BOM count and timing jitter in synchronized acquisition systems. |
| Dual voltage monitors | +1.8V and +2.7V thresholds with timeout - provides robust brown-out detection for reliable reset sequencing in mixed-voltage embedded systems. |
Applications
| Portable ECG Monitors | Industrial Temperature Controllers |
|---|---|
Use Scenario: Battery-powered handheld ECG device acquiring low-amplitude biopotential signals from dry electrodes with minimal filtering. IC Role / Device Role / Timing Role: MAX1408CAI performs simultaneous 8-channel analog front-end conditioning, 16-bit digitization at 60Hz, and real-time baseline correction via on-chip offset calibration. Use Value: 1.03mA Run current extends AA battery life beyond 18 months; integrated 1.25V reference ensures consistent gain accuracy across temperature. | Use Scenario: DIN-rail mounted PLC module measuring RTD and thermocouple inputs in HVAC control panels with 4–20mA loop outputs. IC Role / Device Role / Timing Role: MAX1408CAI serves as primary sensor interface, using its 8:1 mux to scan multiple temperature probes and its DACs to drive analog output stages. Use Value: Force/sense DAC architecture compensates for lead resistance in 3-wire RTD measurements; 30Hz conversion rate rejects 50/60Hz interference. |
| Smart Water Meters | Automated Test Equipment (ATE) |
Use Scenario: Ultrasonic flow meter with piezoelectric transducers requiring precise excitation and echo digitization under intermittent power. IC Role / Device Role / Timing Role: MAX1408CAI wakes from 2.5µA Sleep mode via WU1 on flow event, acquires burst-mode ADC samples, and triggers DAC-based transducer drive. Use Value: Wake-up circuitry and RTC enable scheduled measurement intervals; low sleep current meets 10-year battery life targets. | Use Scenario: Benchtop ATE fixture validating analog sensor modules with programmable stimulus and response capture. IC Role / Device Role / Timing Role: MAX1408CAI acts as stimulus generator (via DACs) and measurement engine (via ADC), synchronized by its 2.4576MHz FOUT clock. Use Value: SPI interface allows fast configuration and data readback; 16-bit resolution supports <0.01% test accuracy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel data-acquisition applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1407CAI | 4 auxiliary analog inputs + 2×10-bit DACs; same 28-pin SSOP package and core ADC/DAC specs. | Lacks four additional analog inputs; suitable where channel count is constrained by board area or cost. | Select MAX1407CAI when fewer sensor channels are needed and dual DACs remain essential for excitation/control loops. |
| ADS1258IPWR | 24-bit delta-sigma ADC, 8-channel mux, no integrated DAC or RTC; 28-pin TSSOP package. | Higher resolution but requires external DAC, clock source, and RTC - increases BOM and layout complexity. | Choose ADS1258IPWR only when 24-bit resolution is mandatory and system-level integration of timing/support functions is handled externally. |
Compared with MAX1407CAI, the MAX1408CAI adds four extra analog inputs without sacrificing DAC count or power efficiency; versus ADS1258IPWR, it trades raw resolution for complete system integration - reducing component count, PCB area, and firmware overhead in compact, battery-sensitive designs.
Availability
MAX1408CAI is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial temperature controllers, smart utility meters, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1408CAI 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 MAX1407/MAX1408/MAX1409/MAX1414 family was engineered specifically for low-power, multichannel sensor data acquisition in space- and energy-constrained systems - integrating ADC, DAC, RTC, reference, and system supervision in a single 28-pin SSOP package.
FAQ
What is the maximum sampling rate supported by the MAX1408CAI ADC?
The MAX1408CAI ADC supports fixed continuous conversion rates of 30Hz or 60Hz - selectable via the RATE bit. It does not support variable or higher-speed sampling; these rates are optimized for anti-aliasing and noise rejection in low-frequency sensor applications such as temperature, pressure, and biomedical signal acquisition. The MAX1408CAI achieves ±1.5 LSB INL at 60Hz in buffered bipolar mode.
Does the MAX1408CAI include an internal voltage reference, and can it be bypassed?
Yes, the MAX1408CAI integrates a buffered 1.25V bandgap reference with 18ppm/°C typical drift, used by both the ADC and DAC. It can be disabled to use an external reference applied to the REF pin (1.25V ±0.10V range). When internal reference is powered down, REF becomes a high-impedance input with 540kΩ resistance - enabling precision external references for applications requiring tighter tolerance or lower noise.
How many analog input channels does the MAX1408CAI support, and what is the multiplexer configuration?
The MAX1408CAI supports eight auxiliary analog inputs (IN0–IN7) routed through a differential 8:1 input multiplexer to the ADC. Inputs IN0–IN3 connect to both positive and negative mux paths, while IN4–IN7 are assigned to either positive or negative paths only - enabling flexible fully differential, pseudo-differential, or single-ended configurations. This architecture is explicitly documented for MAX1408CAI in Table 1 and Pin Description sections of the datasheet.
What are the power-supply requirements and current consumption modes of the MAX1408CAI?
The MAX1408CAI operates from a single +2.7V to +3.6V supply (AVDD/DVDD) and consumes 1.03mA in Run mode, 530µA in Idle mode, 330µA in Standby mode, and just 2.5µA in Sleep mode - with RTC, wake-up circuitry, and voltage monitors fully active. In Sleep mode, supply voltage can drop to +1.8V, extending battery life in intermittently active systems. All modes are confirmed in the Electrical Characteristics table on page 6 of the datasheet.
Can the MAX1408CAI's DAC outputs drive loads directly, and what is their voltage range?
The MAX1408CAI's OUT1 and OUT2 DAC outputs deliver a voltage range of 0.05V to AVDD – 0.2V under no-load conditions, as specified in the Electrical Characteristics table (page 4). They require external feedback resistors (connected to FB1/FB2) to set gain and output range. With RL = 12kΩ and CL = 200pF, they achieve 65µs settling time to ±1/2 LSB and 18 V/ms slew rate - suitable for driving op-amp inputs or low-impedance sensor excitation circuits, but not direct high-current loads.
MAX1408CAI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 60
- Number of Inputs:
- 8
- Input Type:
- Differential
- Data Interface:
- Microwire, QSPI, SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 1.8V ~ 3.6V, 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 1.8V ~ 3.6V, 2.7V ~ 3.6V
- Features:
- PGA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1408CAI FAQ
1.How can I place an order for MAX1408CAI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1408CAI 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 MAX1408CAI reliable?
The price and inventory of MAX1408CAI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1408CAI is usually 5 days.
3.What payment methods are accepted for MAX1408CAI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1408CAI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1408CAI?
MAX1408CAI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1408CAI 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 MAX1408CAI?
For technical support, including MAX1408CAI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1408CAI requirements.
6.How does Aetrix verify that MAX1408CAI is sourced from the original manufacturer or authorized distributors?
All MAX1408CAI 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 MAX1408CAI meets industry standards.
7.What is the process for return or replacement of MAX1408CAI?
All MAX1408CAI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1408CAI, 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 MAX1408CAI part is unused and in its original packaging.
Return procedure for MAX1408CAI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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