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Analog Devices Inc./Maxim Integrated MAX1089ETA+T
- Part No.:
- MAX1089ETA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
MAX1089ETA+T.pdf
- Description:
- IC ADC 10BIT 150KSPS 8-TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,710
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Product details
Overview
MAX1089ETA+T from Maxim Integrated is a 10-bit, true-differential successive-approximation ADC operating from a single +3V supply, delivering 150ksps sampling rate, ±1.0 LSB INL, and 61dB SINAD in an 8-pin TDFN-EP package. It features AutoShutdown (0.2µA), internal conversion clock, and SPI/QSPI/MICROWIRE-compatible 3-wire interface - optimized for portable battery-powered data acquisition where space and power are constrained.
For engineers reviewing the MAX1089ETA+T datasheet, MAX1089ETA+T pinout, MAX1089ETA+T application, or MAX1089ETA+T equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The MAX1089ETA+T implements a SAR architecture with integrated track-and-hold, supporting true-differential input ranges from 0 to VREF (unipolar) or ±VREF/2 (bipolar), selected via CNVST timing. Its internal 4MHz oscillator (±10%) eliminates external clock dependency while enabling precise 3.7µs conversion time.
Input acquisition is governed by tACQ = 7 × (RS + 1.5kΩ) × 24pF + 1µs, with minimum 1.4µs guaranteed. The analog front-end includes clamping diodes (GND −0.3V to VDD +0.3V), 34pF input capacitance, and ±0.01µA leakage - requiring careful source impedance management below 300Ω for full AC performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR output - supports 1024 discrete levels for medium-precision sensor digitization. |
| Sampling Rate | 150ksps maximum - enables capture of signals up to 100kHz full-linear bandwidth (SINAD >56dB). |
| INL / DNL | ±1.0 LSB integral nonlinearity and no missing codes - ensures monotonicity and <0.1% end-point error across temperature. |
| Supply Current | 200µA at 150ksps, 13µA at 10ksps, 0.2µA in AutoShutdown - enables µA-level sleep between conversions in duty-cycled systems. |
| Digital Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial (SCLK, CNVST, DOUT) - interoperable with standard microcontroller peripherals without protocol translation. |
| Input Type | True-differential AIN+/AIN− with software-configurable unipolar/bipolar mode - rejects common-mode noise and supports floating sensor bridges. |
| Reference Input | External VREF (1.0V to VDD+50mV); requires 0.1µF bypass - decouples accuracy from VDD variation and enables ratiometric measurements. |
Pinout & Package
Package: 8-pin TDFN-EP (3mm × 3mm, 0.75mm height) with exposed pad (EP) - thermally enhanced for low-power operation in compact layouts; EP may be grounded or left floating per layout requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | +2.7V to +3.6V single supply; bypass with 0.1µF capacitor close to pin to suppress high-frequency noise affecting comparator stability. |
| AIN+ (Pin 2) | Positive differential analog input | Connects to T/H positive capacitor during track mode; must stay within GND −0.3V to VDD +0.3V to avoid damage or measurement error. |
| AIN− (Pin 3) | Negative differential analog input | Completes true-differential pair; same voltage range as AIN+; mismatch <0.1 LSB channel-to-channel gain matching ensures accurate ΔV measurement. |
| GND (Pin 4) | Analog/digital ground reference | Single ground plane recommended; star-point connection to system ground minimizes noise coupling into sensitive analog nodes. |
| REF (Pin 5) | External reference voltage input | Sets full-scale range; 0.1µF bypass required; input current ±0.01µA allows high-impedance reference sources (e.g., precision voltage dividers). |
| CNVST (Pin 6) | Conversion start and mode control | Rising edge powers up device and initiates track; falling edge triggers hold/conversion; pulse timing selects unipolar/bipolar mode for MAX1089ETA+T. |
| DOUT (Pin 7) | Serial data output | MSB-first 12-bit stream (10 data + 2 sub-bits); transitions on SCLK falling edge; high-impedance after full read - prevents bus contention. |
| SCLK (Pin 8) | Serial clock input | Accepts up to 8MHz clock (30–70% duty cycle); controls data timing; no external pull-up needed due to defined VOL/VOH specs. |
Key Features
| Feature | Design Value |
|---|---|
| True-differential T/H with 150kHz effective sampling rate | Enables rejection of common-mode noise in bridge sensors and isolated transducers without external instrumentation amplifiers. |
| Software-configurable unipolar/bipolar conversion | Single CNVST timing sequence selects input polarity - eliminates need for external signal conditioning or mode-select logic. |
| AutoShutdown between conversions | Reduces average current to <0.2µA during idle periods - extends battery life in intermittent-sampling applications like wireless sensor nodes. |
| Internal 4MHz conversion clock | Removes requirement for external clock generation circuitry and simplifies PCB layout by eliminating clock routing near analog inputs. |
| 8-pin TDFN-EP package with exposed pad | 3mm × 3mm footprint saves >50% board area vs. SOIC-8; thermal pad improves power dissipation margin at full throughput. |
Applications
| Portable Temperature Monitors | Flowmeters |
|---|---|
Use Scenario: Battery-powered handheld thermometer using thermistor or RTD with ratiometric excitation. IC Role / Device Role / Timing Role: True-differential ADC digitizes bridge output while rejecting EMI from display backlight or RF modules. Use Value: 61dB SINAD and ±1.0 LSB INL ensure ±0.1°C resolution over −40°C to +85°C without calibration drift compensation. |
Use Scenario: Ultrasonic or turbine-based flow sensor in smart water meter with pulsed excitation. IC Role / Device Role / Timing Role: Captures differential pressure or velocity pulses at 10–50ksps with minimal power draw between readings. Use Value: 13µA current at 10ksps and AutoShutdown enable >10-year battery life in AMI deployments. |
| Touch Screens | Low Power Data Acquisition |
Use Scenario: Resistive touch panel controller in medical tablet with ESD-sensitive analog front-end. IC Role / Device Role / Timing Role: Digitizes X/Y electrode voltages in true-differential mode to reject finger-induced noise and supply ripple. Use Value: Input protection (GND−0.3V to VDD+0.3V) and 34pF input capacitance simplify ESD filtering without degrading response time. |
Use Scenario: Modular sensor node aggregating strain gauge, humidity, and ambient light readings. IC Role / Device Role / Timing Role: Central 10-bit ADC interfaces multiple sensors via external multiplexer; SPI compatibility enables direct connection to Cortex-M0+ MCU. Use Value: 3.7µs conversion time and MSB-available timing allow deterministic sampling windows in RTOS-based firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar true-differential 10-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit resolution, +5V-only supply, no AutoShutdown, 200ksps max, SO-8 package | Higher resolution but higher power (1.2mA @ 200ksps); lacks differential input - requires external op-amp for true-differential sensing. | Select when 12-bit precision outweighs power and board space constraints; not drop-in due to supply and interface differences. |
| MCP3201-I/P | 12-bit, single-ended only, +2.7V–+5.5V supply, SPI-only, 100ksps, 8-pin PDIP/SOIC | No differential capability; no AutoShutdown; larger package; lower sampling rate - suitable only for non-noisy single-ended sources. | Choose for legacy through-hole designs or cost-sensitive applications where differential rejection is unnecessary. |
Compared with MAX1089ETA+T, ADS7822U trades ultra-low power and differential input for higher resolution and speed, while MCP3201-I/P sacrifices noise immunity and power efficiency for broader supply range and simpler interface - making MAX1089ETA+T uniquely suited for compact, battery-operated differential sensor systems.
Availability
MAX1089ETA+T is available at Aetrix Electronics and suitable for portable temperature monitors, flowmeters, and touch screens requiring stable component supply with RoHS-compliant, lead-free packaging and guaranteed -40°C to +85°C operation.
Supply support for MAX1089ETA+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 delivers micropower, small-footprint ADCs targeting battery-powered data acquisition - emphasizing low quiescent current, integrated T/H, and SPI-compatible serial interface without external clocks.
FAQ
What is the maximum sampling rate of the MAX1089ETA+T, and how does it relate to usable input bandwidth?
The MAX1089ETA+T achieves a maximum sampling rate of 150ksps, with a full-linear bandwidth of 100kHz (SINAD >56dB) and small-signal bandwidth of 1MHz. This allows accurate digitization of baseband signals up to 100kHz or undersampling of higher-frequency signals - provided anti-alias filtering is applied. The 3.7µs conversion time and 1.4µs acquisition window constrain minimum inter-conversion intervals in burst-mode operation.
How does the MAX1089ETA+T implement true-differential input, and what are the voltage limits?
The MAX1089ETA+T uses an internal track-and-hold with separate positive and negative input capacitors connected to AIN+ and AIN−. During track mode, both inputs sample simultaneously; conversion computes their difference. Absolute voltage limits are GND −0.3V to VDD +0.3V per pin, with accurate operation requiring AIN+ and AIN− to stay within GND to VDD ±50mV - critical for maintaining linearity in bridge or isolated sensor interfaces.
What is the role of the CNVST pin beyond starting conversion in the MAX1089ETA+T?
In the MAX1089ETA+T, CNVST serves dual functions: its rising edge powers up the device and initiates track mode, while its falling edge triggers hold and conversion. Crucially, the timing sequence (single high pulse vs. high-low-high) selects unipolar or bipolar conversion mode - enabling software-controlled input range configuration without additional control lines or external logic.
Does the MAX1089ETA+T require an external reference, and what are the key design considerations?
Yes, the MAX1089ETA+T requires an external reference applied to the REF pin, with a valid range of +1.0V to VDD +50mV. A 0.1µF ceramic capacitor must be placed directly at the REF pin to stabilize the reference during conversion. Input current is ±0.01µA, allowing use with high-impedance sources like resistor dividers - but low-noise, low-drift references (e.g., MAX6126) are recommended for best INL performance.
How does AutoShutdown operate in the MAX1089ETA+T, and what is its impact on system power budget?
AutoShutdown activates automatically when CNVST is held low between conversions, reducing supply current to 0.2µA. At 150ksps, average current is 200µA; at 1ksps, it drops to 1.5µA. This dynamic scaling enables predictable power modeling - for example, a sensor node sampling once per second draws just ~1.7µA average, extending CR2032 battery life beyond 5 years without compromising responsiveness.
MAX1089ETA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
MAX1089ETA+T FAQ
1.How can I place an order for MAX1089ETA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1089ETA+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 MAX1089ETA+T reliable?
The price and inventory of MAX1089ETA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1089ETA+T is usually 5 days.
3.What payment methods are accepted for MAX1089ETA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1089ETA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1089ETA+T?
MAX1089ETA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1089ETA+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 MAX1089ETA+T?
For technical support, including MAX1089ETA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1089ETA+T requirements.
6.How does Aetrix verify that MAX1089ETA+T is sourced from the original manufacturer or authorized distributors?
All MAX1089ETA+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 MAX1089ETA+T meets industry standards.
7.What is the process for return or replacement of MAX1089ETA+T?
All MAX1089ETA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1089ETA+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 MAX1089ETA+T part is unused and in its original packaging.
Return procedure for MAX1089ETA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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