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Analog Devices Inc./Maxim Integrated MAX1394ETB+
- Part No.:
- MAX1394ETB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX1394ETB+.pdf
- Description:
- 8-BIT, SAR ADC
- Quantity:
- Payment:
- Shipping:
Inventory:9,300
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Product details
Overview
The MAX1394ETB+ from Maxim Integrated is an 8-bit, single-supply, micropower successive-approximation register (SAR) analog-to-digital converter (ADC) with dual single-ended analog inputs, operating from +1.5V to +3.6V and delivering up to 416ksps throughput. It features ±0.2 LSB INL/DNL, 49dB SINAD at 100kHz, external reference support (0.6V to VDD), and AutoShutdown™ between conversions. It targets space-constrained, battery-powered data acquisition in portable medical instruments and process monitoring systems.
For engineers reviewing the MAX1394ETB+ datasheet, MAX1394ETB+ pinout, MAX1394ETB+ application, or MAX1394ETB+ equivalent, this page delivers verified electrical specifications, validated TDFN-10 pin functions, confirmed dual-channel single-ended operation mode, and real-world timing behavior for SPI/QSPI/MICROWIRE/DSP interfaces - all aligned with Maxim's official 19-3720 Rev 1 datasheet.
Technical Context
The MAX1394ETB+ implements a switched-capacitor SAR architecture with integrated track-and-hold, supporting two independent single-ended input channels (AIN1/AIN2) selected via the CH1/CH2 digital control pin. Conversion is initiated by a falling edge on CS, with sampling completed on the third SCLK falling edge and full 8-bit MSB-first serial output clocked across 12 SCLK cycles.
It uses an external reference (0.6V to VDD) and operates over –40°C to +85°C. Its low-power design achieves 3.1µW at 1ksps (1.8V), <1µA shutdown current, and dynamic performance including –70dB channel-to-channel crosstalk and 4MHz full-power bandwidth - enabling high-fidelity sampling of transient signals in ultra-low-power embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit SAR - delivers discrete quantization steps of VREF/256 for precise low-complexity digitization. |
| Throughput Rate | 416ksps maximum - supports real-time sampling of signals up to ~150kHz full-linear bandwidth (SINAD > 48dB). |
| DC Accuracy | ±0.25 LSB total unadjusted error (TUE) - ensures monotonic output and no missing codes across temperature. |
| Digital Interface | SPI-/QSPI-/MICROWIRE-/DSP-compatible 3-wire serial - enables direct connection to microcontrollers without level-shifting. |
| Analog Inputs | Two single-ended channels (AIN1, AIN2), selectable via CH1/CH2 pin - eliminates need for external multiplexing in dual-sensor systems. |
| Supply Range | +1.5V to +3.6V - allows direct operation from two alkaline/NiMH cells or a single CR2032 lithium coin cell. |
| Power Consumption | 0.230mW at 100ksps (1.8V); 3.1µW at 1ksps (1.8V) - extends battery life in portable dataloggers beyond 1 year. |
Pinout & Package
MAX1394ETB+ is housed in a 3mm × 3mm, 10-pin TDFN-EP package with exposed pad (not internally connected; recommended to tie to GND). Pin numbering follows standard top-view orientation with pin 1 marked by dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Positive supply input (1.5V–3.6V); requires local 0.1µF bypass capacitor to GND for noise suppression. |
| 2 | AIN2 | Analog input channel 2 - accepts 0 to VREF single-ended signal; high-impedance (16pF, ±1.5µA leakage). |
| 3 | AIN1 | Analog input channel 1 - identical electrical specs to AIN2; selected when CH1/CH2 = low. |
| 4 | GND | Analog/digital ground reference - must connect to star ground point or solid ground plane per layout guidelines. |
| 5 | REF | External reference voltage input (0.6V to VDD + 0.05V); requires 0.1µF bypass capacitor for stable conversion accuracy. |
| 6 | CH1/CH2 | Channel-select digital input - low = AIN1 active, high = AIN2 active; requires tCHS = 10ns setup before first SCLK. |
| 7 | OE | Active-low output enable - drives DOUT high-impedance when high; tied to CS for SPI/QSPI compatibility. |
| 8 | CS | Active-low chip select - falling edge initiates power-up, acquisition, and conversion sequence. |
| 9 | DOUT | Serial data output - MSB-first, 8-bit result preceded by four zeros; transitions on SCLK falling edge. |
| 10 | SCLK | Serial clock input (0.1–5MHz) - controls acquisition timing, bit clocking, and AutoShutdown trigger after LSB. |
Key Features
| Feature | Design Value |
|---|---|
| Dual single-ended input channels | Enables independent sampling of two sensors (e.g., temperature + pressure) without external MUX or additional ADCs. |
| Channel-to-channel matching | ±0.05 LSB offset/gain matching - ensures consistent scaling across AIN1/AIN2 for differential measurement accuracy. |
| AutoShutdown™ between conversions | Reduces average current to µW-level at low throughput (e.g., 3.1µW @ 1ksps), eliminating need for software-controlled power gating. |
| 4MHz full-power bandwidth | Supports undersampling of kHz-range transients (e.g., ECG spikes, vibration bursts) without aliasing if anti-alias filter applied. |
| Low-voltage serial interface | Full 0.3×VDD/0.7×VDD logic thresholds - ensures reliable communication with 1.8V microcontrollers without level shifters. |
Applications
| Portable Datalogging | Medical Instruments |
|---|---|
Use Scenario: Battery-powered environmental sensor node logging temperature, humidity, and light intensity every 10 seconds. IC Role / Device Role / Timing Role: Dual-channel ADC digitizing two analog sensor outputs sequentially with minimal wake-up latency and automatic power-down between samples. Use Value: 3.1µW standby power extends CR2032 coin-cell life beyond 2 years while maintaining 8-bit resolution for trend analysis. |
Use Scenario: Handheld blood glucose meter acquiring analog signal from electrochemical test strip. IC Role / Device Role / Timing Role: Single-shot, low-noise ADC capturing strip response within 100µs after excitation pulse, rejecting supply ripple via PSR of ±150µV/V. Use Value: ±0.25 LSB TUE ensures clinical-grade repeatability across battery voltage decay (1.6V–3.0V) and ambient temperature (–20°C–+50°C). |
| Battery-Powered Instruments | Process Control |
Use Scenario: Wireless pH/ORP probe transmitting calibrated readings via BLE every 5 minutes. IC Role / Device Role / Timing Role: Low-quiescent-current ADC interfacing directly to op-amp buffer, powered from unregulated 2×AA alkaline stack (1.6V–3.0V). Use Value: 1.5V minimum supply enables operation down to end-of-life battery voltage without DC-DC converter, reducing BOM cost and board area. |
Use Scenario: Industrial field transmitter measuring 4–20mA loop current via precision shunt resistor. IC Role / Device Role / Timing Role: High-accuracy ADC converting shunt voltage with ±0.05 LSB channel matching to reject common-mode drift in noisy plant environments. Use Value: –70dB channel crosstalk prevents interference between dual-loop diagnostics (e.g., primary flow + secondary temperature compensation). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit, 200ksps, single-ended only, 2.7–5.25V supply, SPI-only interface, no AutoShutdown | Lacks dual-channel selection and micropower modes; requires higher supply voltage | Choose for legacy 3.3V systems where 200ksps suffices and external power management is acceptable |
| MAX11100ETE+ | 12-bit, 500ksps, true-differential input, 2.7–3.6V supply, internal reference, SPI/QSPI | Higher resolution but incompatible input topology (differential only) and no CH1/CH2 channel select | Choose when 12-bit precision is required and system uses differential sensors; not a drop-in replacement |
Compared with ADS7822U and MAX11100ETE+, the MAX1394ETB+ uniquely combines dual single-ended inputs, sub-1µA shutdown, 1.5V operation, and hardware channel selection - making it optimal for ultra-low-power, multi-sensor, coin-cell-powered designs where pin count and energy budget are critical.
Availability
MAX1394ETB+ is available at Aetrix Electronics and suitable for portable datalogging, battery-powered instrumentation, and industrial process monitoring requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1394ETB+ 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 MAX1391/MAX1394 family was designed specifically for ultra-low-power, space-constrained data-acquisition systems - emphasizing micropower operation, small TDFN packaging, and flexible serial interfacing without sacrificing DC accuracy or dynamic performance.
FAQ
What is the maximum sample rate of the MAX1394ETB+ and under what conditions is it achieved?
The MAX1394ETB+ achieves a maximum throughput rate of 416ksps when operated with a 5MHz SCLK, VDD = +1.5V to +3.6V, and VREF = VDD. This rate includes full power-up, acquisition, conversion, and AutoShutdown timing - confirmed in the Electrical Characteristics table (Rev 1, p.3). At 416ksps, the MAX1394ETB+ consumes 0.97mW at 1.8V, making it suitable for high-speed portable sensing where power and speed must coexist.
How does the MAX1394ETB+ handle channel selection between AIN1 and AIN2?
The MAX1394ETB+ uses the CH1/CH2 pin (Pin 6) for hardware-based channel selection: pulling it low selects AIN1, driving it high selects AIN2. This selection must be stable for at least 10ns (tCHS) before the first SCLK rising edge after CS fall. Unlike software-configured MUXes, this pin-driven method eliminates firmware overhead and guarantees deterministic timing - critical for synchronized dual-sensor sampling in the MAX1394ETB+.
Does the MAX1394ETB+ require an external reference, and what is its supported voltage range?
Yes, the MAX1394ETB+ requires an external reference applied to the REF pin (Pin 5), with a valid range of 0.6V to (VDD + 0.05V). This flexibility allows use of precision references (e.g., REF3025) or direct connection to VDD for cost-sensitive applications. The device specifies ±0.25 LSB total unadjusted error across this full range, and REF must be bypassed with a 0.1µF capacitor to GND - a requirement explicitly stated in the Typical Operating Circuit and Absolute Maximum Ratings sections of the MAX1394ETB+ datasheet.
What is the function of the exposed pad (EP) on the MAX1394ETB+ TDFN package?
The exposed pad (EP) on the MAX1394ETB+ TDFN-10 package is not internally connected to any die circuitry. Per Maxim's datasheet (p.8, "Exposed Pad"), it may be left floating or soldered to the PCB ground plane - both configurations yield identical electrical performance. Connecting EP to GND improves thermal dissipation and mechanical stability but is not required for functional operation. No internal voltage or signal is routed to this pad.
Can the MAX1394ETB+ interface directly with a 1.8V microcontroller using SPI mode?
Yes, the MAX1394ETB+ supports direct SPI interfacing with 1.8V microcontrollers. Its digital inputs (CS, SCLK, CH1/CH2, OE) accept logic-high thresholds as low as 0.7×VDD and logic-low as high as 0.3×VDD - meaning at VDD = 1.8V, VIH = 1.26V and VIL = 0.54V, comfortably accommodating standard 1.8V GPIO levels. The DOUT output also swings rail-to-rail (0.1×VDD to 0.9×VDD), ensuring noise margin. No level-shifting circuitry is needed for 1.8V MCU integration.
MAX1394ETB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 416k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- 3-Wire Serial, DSP, Microwire, QSPI, SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 1.5V ~ 3.6V
- Voltage - Supply, Digital:
- 1.5V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-TDFN-EP (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1394ETB+ FAQ
1.How can I place an order for MAX1394ETB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1394ETB+ 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 MAX1394ETB+ reliable?
The price and inventory of MAX1394ETB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1394ETB+ is usually 5 days.
3.What payment methods are accepted for MAX1394ETB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1394ETB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1394ETB+?
MAX1394ETB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1394ETB+ 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 MAX1394ETB+?
For technical support, including MAX1394ETB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1394ETB+ requirements.
6.How does Aetrix verify that MAX1394ETB+ is sourced from the original manufacturer or authorized distributors?
All MAX1394ETB+ 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 MAX1394ETB+ meets industry standards.
7.What is the process for return or replacement of MAX1394ETB+?
All MAX1394ETB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1394ETB+, 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 MAX1394ETB+ part is unused and in its original packaging.
Return procedure for MAX1394ETB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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