My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1089EKA-T
- Part No.:
- MAX1089EKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
MAX1089EKA-T.pdf
- Description:
- 10-BIT, TRUE-DIFFERENTIAL ADC
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1089EKA-T from Maxim Integrated is a 10-bit, true-differential analog-to-digital converter (ADC) in an 8-pin SOT23 package, operating from a single +3V supply. It delivers 150ksps sampling rate, ±1.0 LSB INL, 61dB SINAD, and auto-shutdown current of 0.2µA - optimized for low-power portable data acquisition where differential signal integrity and space-constrained PCB layout are critical.
For engineers reviewing the MAX1089EKA-T datasheet, MAX1089EKA-T pinout, MAX1089EKA-T application, or MAX1089EKA-T equivalent, this page provides verified technical context, real-world timing behavior, differential input configuration logic, SPI/QSPI/MICROWIRE interface compatibility, and validated alternative options for battery-powered sensor interfaces.
Technical Context
The MAX1089EKA-T implements a successive-approximation (SAR) architecture with an on-chip true-differential track-and-hold, supporting unipolar (0 to VREF) and bipolar (±VREF/2) input ranges via software-configurable CNVST sequencing. Its internal 4MHz oscillator enables 3.7µs conversion time without external clock dependency.
It uses a 3-wire serial interface compatible with SPI, QSPI, and MICROWIRE protocols (CPOL=0, CPHA=0), outputs 12-bit frames (10 data + 2 sub-bits) MSB-first on DOUT, and enters AutoShutdown (<0.2µA) between conversions when CNVST is held low - eliminating need for external power management control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR ADC - delivers 1024 discrete output codes with monotonic transfer function and no missing codes over temperature. |
| Sampling Rate | 150ksps maximum - supports real-time digitization of signals up to 100kHz full-linear bandwidth (SINAD >56dB). |
| Differential Input Range | True-differential AIN+ / AIN−, 0 to VREF unipolar or ±VREF/2 bipolar - rejects common-mode noise without external instrumentation amplifier. |
| Power Consumption | 200µA at 150ksps (VDD = +3V); 0.2µA in AutoShutdown - enables multi-year operation from coin-cell batteries in intermittent-sampling systems. |
| Dynamic Performance | 61dB SINAD, 70dB SFDR, −70dB THD at 10kHz - sufficient for precision temperature monitoring and flowmeter applications requiring <0.1% measurement accuracy. |
| Reference Input | External VREF = +2.5V (typical), range +1.0V to VDD+50mV - allows system-level reference sharing or precision external reference integration. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible, 8MHz max SCLK, MSB-first 12-bit frame - interoperates with standard microcontroller peripherals without protocol translation. |
Pinout & Package
Package: 8-pin SOT23 (lead-free, RoHS-compliant), 2.9mm × 1.6mm footprint, exposed pad not present (TDFN variant has EP; SOT23 does not).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | +2.7V to +3.6V single supply; requires local 0.1µF bypass capacitor to GND for stable reference and comparator operation. |
| 2 - AIN+ | Differential positive analog input | Connects to T/H positive capacitor during track mode; accepts input up to VDD+50mV, must be ≥ GND−0.3V. |
| 3 - AIN− | Differential negative analog input | Connects to T/H negative capacitor during track mode; enables true differential measurement and common-mode rejection. |
| 4 - GND | Analog/digital ground reference | Single ground plane required; star-point grounding recommended to minimize digital switching noise coupling into analog path. |
| 5 - REF | External reference voltage input | Sets full-scale range; bypass with 0.1µF capacitor; supports programmable gain scaling by changing VREF externally. |
| 6 - CNVST | Conversion start and mode control | Rising edge powers up device; falling edge triggers hold/conversion; pulse sequence selects unipolar/bipolar mode (not channel select). |
| 7 - DOUT | Serial data output | 3-state output; presents MSB after 3.7µs conversion; transitions on SCLK falling edge; high-impedance after 12 bits clocked out. |
| 8 - SCLK | Serial clock input | Master-generated clock (0–8MHz); controls data timing; rising edge latches data into host controller per SPI/QSPI convention. |
Key Features
| Feature | Design Value |
|---|---|
| True-differential track-and-hold | Enables direct connection to bridge sensors or isolated transducers without front-end op-amp buffering or level shifting. |
| Software-configurable unipolar/bipolar mode | Single CNVST pulse sequence selects input range - eliminates need for external mode-select logic or configuration registers. |
| AutoShutdown between conversions | Reduces average current to <0.2µA at low throughput (e.g., 1ksps → 1.5µA), enabling ultra-low-duty-cycle sensor wake-up architectures. |
| Internal conversion clock | Removes requirement for external clock source or precise timing coordination - simplifies µC firmware and reduces BOM count. |
| SPI/QSPI/MICROWIRE compatibility | Interoperates with industry-standard serial peripheral interfaces without glue logic or bit-banging - accelerates driver development. |
Applications
| Portable Temperature Monitors | Flowmeters |
|---|---|
|
Use Scenario: Battery-powered handheld thermometers using RTD or thermocouple inputs with cold-junction compensation. IC Role / Device Role / Timing Role: True-differential ADC digitizes low-level sensor voltage while rejecting EMI and ground-loop noise in field environments. Use Value: 61dB SINAD and ±1.0 LSB INL ensure <0.1°C resolution over −40°C to +85°C industrial range without calibration drift compensation. |
Use Scenario: Ultrasonic or magnetic flow sensors in smart water/gas meters requiring long-term stability and low standby power. IC Role / Device Role / Timing Role: Digitizes differential pressure or velocity signals with 150ksps burst sampling during active measurement cycles. Use Value: AutoShutdown cuts average current to sub-µA between readings, extending 10-year battery life in sealed meter housings. |
| Touch Screens | Low Power Data Acquisition |
|
Use Scenario: Resistive touch overlay controllers in medical tablets or industrial HMIs where ESD robustness and analog noise immunity are critical. IC Role / Device Role / Timing Role: Measures X/Y electrode voltage differentials with true-differential input to reject display switching noise and finger capacitance variation. Use Value: 1MHz small-signal input bandwidth supports fast touch response; 8-pin SOT23 minimizes trace length and parasitic coupling. |
Use Scenario: Wireless sensor nodes collecting vibration, humidity, or environmental data with intermittent wake-up and RF transmission. IC Role / Device Role / Timing Role: Core ADC in energy-harvesting or coin-cell designs, interfacing directly to µC SPI peripheral with minimal external components. Use Value: Single +3V supply, 0.1µF REF/VDD bypass only, and no external clock reduce bill-of-materials and PCB area by >30% vs. competing solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit differential ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-pin SOIC, 125ksps max, 2.7V–5.25V supply, no AutoShutdown, requires external clock | Lacks integrated track-and-hold and automatic power cycling - demands additional timing control logic and higher quiescent current. | Choose when legacy SOIC footprint or wider supply range is mandatory, and system-level power management is already implemented. |
| MAX11100ETE+ | 12-bit, 500ksps, 10-pin TDFN, +2.7V–3.6V, true-differential, 1.5µA shutdown | Higher resolution and speed, but larger package and 7.5× higher shutdown current - less suitable for coin-cell lifetime targets. | Choose when 12-bit precision and faster sampling are required, and PCB area allows 3mm × 3mm TDFN footprint. |
Compared with ADS7822U and MAX11100ETE+, the MAX1089EKA-T uniquely balances ultra-low shutdown current (0.2µA), true-differential input, and SOT23 size - making it optimal for space- and energy-constrained portable instrumentation where 10-bit resolution suffices.
Availability
MAX1089EKA-T is available at Aetrix Electronics and suitable for portable temperature monitors, flowmeters, and touch screens requiring stable component supply across extended production lifecycles.
Supply support for MAX1089EKA-T 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 portable applications.
The MAX1086–MAX1089 family was engineered specifically for ultra-low-power, space-constrained data acquisition - delivering differential ADC performance in sub-3mm footprints without sacrificing dynamic range or ease of µC integration.
FAQ
What is the maximum sampling rate supported by the MAX1089EKA-T?
The MAX1089EKA-T supports a maximum sampling rate of 150ksps. This is achieved using its internal 4MHz oscillator and fixed 3.7µs conversion time. At lower throughput rates (e.g., 10ksps), AutoShutdown reduces average supply current to 13µA, preserving battery life without compromising timing predictability. The MAX1089EKA-T maintains full 10-bit linearity and 61dB SINAD across the entire 1ksps–150ksps range.
How does the MAX1089EKA-T configure unipolar versus bipolar input modes?
The MAX1089EKA-T selects unipolar (0 to VREF) or bipolar (±VREF/2) mode via CNVST pulse sequencing: a single high pulse followed by a falling edge configures unipolar mode; a high–low–high pulse sequence configures bipolar mode. This hardware-based selection eliminates configuration registers or I²C/SPI writes. The MAX1089EKA-T outputs straight binary in unipolar mode and two's complement in bipolar mode - both delivered as 12-bit frames (10 data + 2 sub-bits) on DOUT.
Does the MAX1089EKA-T require an external reference voltage?
Yes, the MAX1089EKA-T requires an external reference voltage applied to the REF pin. For +3V operation, the typical reference is +2.5V, with a valid range of +1.0V to VDD+50mV. A 0.1µF ceramic capacitor must be placed directly between REF and GND to stabilize the reference node and suppress high-frequency noise that would degrade INL and SINAD. The MAX1089EKA-T does not include an internal reference; all accuracy specifications assume proper external reference implementation.
What serial interface protocols is the MAX1089EKA-T compatible with?
The MAX1089EKA-T is fully compatible with SPI, QSPI, and MICROWIRE protocols using CPOL = 0 and CPHA = 0. It operates with master-controlled SCLK up to 8MHz, outputs data MSB-first on DOUT's falling edge, and is clocked into the host µC on SCLK's rising edge. The MAX1089EKA-T supports both 8-bit dual-read (SPI/MICROWIRE) and single 12-bit read (QSPI) framing - no protocol translation or custom firmware is needed for integration with standard microcontroller peripherals.
What is the purpose of the two sub-bits (S1, S0) in the MAX1089EKA-T output frame?
The MAX1089EKA-T outputs a 12-bit frame comprising 10 data bits (B9–B0) followed by two sub-bits (S1, S0). These sub-bits provide additional resolution beyond the nominal 10-bit output - effectively extending effective resolution to ~10.3 bits under low-noise conditions. They are included in every conversion and must be clocked out before initiating the next CNVST cycle; omission causes mode misalignment in subsequent conversions. The MAX1089EKA-T datasheet specifies their use for enhanced linearity in precision measurement applications.
MAX1089EKA-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 150
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- 3-Wire Serial, Microwire, QSPI, SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- Internal Oscillator
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1089EKA-T FAQ
1.How can I place an order for MAX1089EKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1089EKA-T 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 MAX1089EKA-T reliable?
The price and inventory of MAX1089EKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1089EKA-T is usually 5 days.
3.What payment methods are accepted for MAX1089EKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1089EKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1089EKA-T?
MAX1089EKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1089EKA-T 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 MAX1089EKA-T?
For technical support, including MAX1089EKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1089EKA-T requirements.
6.How does Aetrix verify that MAX1089EKA-T is sourced from the original manufacturer or authorized distributors?
All MAX1089EKA-T 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 MAX1089EKA-T meets industry standards.
7.What is the process for return or replacement of MAX1089EKA-T?
All MAX1089EKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1089EKA-T, 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 MAX1089EKA-T part is unused and in its original packaging.
Return procedure for MAX1089EKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1089EKA-T Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
