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Analog Devices Inc./Maxim Integrated MAX1088EKA-T
- Part No.:
- MAX1088EKA-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
MAX1088EKA-T.pdf
- Description:
- 10-BIT, TRUE-DIFFERENTIAL ADC
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
The MAX1088EKA-T from Maxim Integrated is a 10-bit, true-differential successive-approximation analog-to-digital converter (SAR ADC) in an 8-pin SOT23 package, operating from a single +5V supply. It delivers 150ksps sampling rate, ±1.0 LSB INL, and 61dB SINAD at 10kHz input, with AutoShutdown current of 0.2µA - optimized for portable battery-powered data acquisition where precision, low power, and space constraints are critical.
For engineers reviewing the MAX1088EKA-T datasheet, MAX1088EKA-T pinout, MAX1088EKA-T application, or MAX1088EKA-T equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to this exact SOT23-packaged, +5V, true-differential variant.
Technical Context
The MAX1088EKA-T implements a SAR architecture with an integrated true-differential track-and-hold, supporting unipolar (0 to VREF) and bipolar (±VREF/2) input ranges via software-configurable CNVST timing. Its internal 4MHz oscillator (±10%) eliminates external clock dependency, enabling conversion completion in 3.7µs with aperture jitter <50ps.
It uses a 3-wire SPI/QSPI/MICROWIRE-compatible interface (MSB-first, 12-bit frame: 10 data + 2 sub-bits), with DOUT transitioning on SCLK falling edge and entering high-impedance after full readout. Input protection diodes clamp AIN+/AIN− to GND–0.3V and VDD+0.3V, while acquisition time tACQ = 1.4µs minimum ensures reliable sampling even with source impedances ≤300Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes; sufficient for medium-precision sensor digitization (e.g., thermistor, strain gauge). |
| Sampling Rate | 150ksps - supports Nyquist-limited bandwidth up to 75kHz; enables capture of fast transients in flowmeter or touch-screen position tracking. |
| INL / DNL | ±1.0 LSB / ±1.0 LSB - guarantees monotonicity and <0.1% full-scale linearity error; critical for closed-loop control feedback accuracy. |
| SINAD | 61dB at 10kHz - corresponds to ~10.2 effective bits; validates usable dynamic range for audio-grade or industrial signal conditioning. |
| Supply Current | 200µA at 150ksps, 0.2µA in shutdown - enables >1-year battery life in coin-cell-powered temperature monitors running at 1ksps. |
| Input Type | True-differential (AIN+/AIN−) - rejects common-mode noise up to 1MHz bandwidth; essential for noisy industrial environments or motor-current sensing. |
| Reference | External VREF (up to +4.096V) - allows precise scaling independent of VDD; supports ratiometric measurements with bridge sensors. |
Pinout & Package
MAX1088EKA-T is housed in an 8-pin SOT23 package (JEDEC MO-178AA), with exposed pad omitted (TDFN variant is MAX1088ETA+T). Pinout is electrically identical across MAX1088 family but functionally distinct from single-ended variants (MAX1086/MAX1087).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VDD | Positive supply input | +4.75V to +5.25V rail; requires local 0.1µF ceramic bypass to GND for stable reference and comparator operation. |
| 2 - AIN+ | Differential positive analog input | Accepts 0 to VREF (unipolar) or ±VREF/2 (bipolar); must stay within GND–0.3V to VDD+0.3V to avoid damage. |
| 3 - AIN− | Differential negative analog input | Paired with AIN+; defines differential voltage (AIN+ − AIN−); same voltage limits as AIN+. |
| 4 - GND | Analog/digital ground reference | Single ground plane required; star-point connection recommended to separate analog/digital return paths. |
| 5 - REF | External reference voltage input | Accepts 1.0V to VDD+50mV; 0.1µF bypass capacitor mandatory for <1 LSB noise contribution. |
| 6 - CNVST | Conversion start/control | Rising edge powers up device; falling edge triggers hold/conversion; pulse width and timing select unipolar/bipolar mode. |
| 7 - DOUT | Serial data output | 3-state, MSB-first; outputs 12-bit frame (10 data + 2 sub-bits); goes high-Z after final bit to prevent bus contention. |
| 8 - SCLK | Serial clock input | Accepts 0–8MHz clock; data valid on falling edge; rising edge used by host for sampling; duty cycle 30–70%. |
Key Features
| Feature | Design Value |
|---|---|
| True-differential input architecture | Enables rejection of EMI and ground bounce in motor drives or industrial PLC I/O modules without external instrumentation amps. |
| Software-configurable unipolar/bipolar mode | Eliminates need for external level-shifting circuitry when measuring bidirectional physical quantities (e.g., pressure differential, current direction). |
| AutoShutdown between conversions | Reduces average current from 200µA (150ksps) to 0.2µA idle - cuts system power by >99% during sensor polling intervals. |
| SPI/QSPI/MICROWIRE compatibility | Interoperates with legacy and modern microcontrollers (e.g., PIC16, ARM Cortex-M) without protocol translation logic or firmware overhead. |
| Internal conversion clock | Removes requirement for external crystal or clock generator; simplifies BOM and PCB layout while maintaining deterministic 3.7µs conversion time. |
Applications
| Portable Temperature Monitors | Flowmeters |
|---|---|
|
Use Scenario: Battery-powered handheld unit measuring NTC thermistor voltage across 0°C–100°C range using ratiometric reference. IC Role / Device Role / Timing Role: True-differential ADC digitizes thermistor bridge output while rejecting PCB trace noise and supply ripple. Use Value: 61dB SINAD and ±1.0 LSB INL ensure ±0.25°C measurement accuracy; 0.2µA shutdown extends CR2032 battery life beyond 2 years at 1-sample/sec. |
Use Scenario: Ultrasonic flowmeter detecting transit-time difference between upstream/downstream signals in HVAC ducts. IC Role / Device Role / Timing Role: High-speed 150ksps sampling captures µs-level time-of-flight shifts; differential input suppresses common-mode EMI from pump motors. Use Value: 1.4µs acquisition time and <50ps aperture jitter enable sub-millisecond timing resolution; SOT23 footprint minimizes board area in compact sensor housing. |
| Touch Screens | Industrial Current Sensing |
|
Use Scenario: Resistive touch overlay on embedded HMI panel, requiring X/Y coordinate digitization with low latency. IC Role / Device Role / Timing Role: Configured in unipolar mode to read voltage divider outputs from touch controller IC; CNVST-driven sequencing selects axes. Use Value: 3.7µs conversion time allows full 4-wire scan in <1ms; 8-pin SOT23 eases routing beneath display flex cable with minimal parasitic capacitance. |
Use Scenario: Bidirectional DC motor current monitoring in factory automation drive, using shunt resistor with ±50mV full-scale swing. IC Role / Device Role / Timing Role: Bipolar mode directly digitizes ±VREF/2 range, matching shunt polarity reversal without external op-amp inversion. Use Value: ±1.0 LSB DNL ensures no missing codes during zero-crossing; CMR >100dB at 50Hz suppresses AC line interference in noisy plant environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar true-differential 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-pin SOIC, +2.7V to +5.25V supply, 200ksps, 12-bit resolution, no AutoShutdown | Higher resolution but larger footprint and fixed 12-bit output format; lacks configurable unipolar/bipolar mode | Select when 12-bit precision outweighs size/power trade-offs and bipolar operation is handled externally |
| MAX1110EKA-T | Same SOT23-8 package, +5V supply, 10-bit, 125ksps, single-ended only, no differential input | Cannot replace true-differential signal chain without external instrumentation amplifier; lower sampling rate | Select only for cost-sensitive single-ended designs where differential noise immunity is not required |
Compared with ADS7822U and MAX1110EKA-T, the MAX1088EKA-T uniquely combines SOT23 size, true-differential input, software-selectable unipolar/bipolar modes, and sub-µA shutdown - making it the only option that preserves signal integrity, board space, and battery life simultaneously in portable differential-sensing applications.
Availability
MAX1088EKA-T is available at Aetrix Electronics and suitable for portable temperature monitors, ultrasonic flowmeters, resistive touch screens, and industrial current sensing requiring stable component supply across extended production lifecycles.
Supply support for MAX1088EKA-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 MAX1088EKA-T belongs to the MAX1086–MAX1089 family of micropower SAR ADCs, engineered specifically for space-constrained, battery-operated systems needing high-accuracy differential signal acquisition without external support components.
FAQ
What is the maximum sampling rate of the MAX1088EKA-T?
The MAX1088EKA-T achieves a maximum sampling rate of 150ksps under specified conditions (VDD = +4.75V to +5.25V, fSCLK = 8MHz, 10kHz sine-wave input). This rate is enabled by its internal 4MHz oscillator and 3.7µs conversion time, allowing full 10-bit results every 6.67µs - sufficient for anti-aliased capture of signals up to 75kHz.
Does the MAX1088EKA-T require an external clock source?
No, the MAX1088EKA-T does not require an external clock source. It contains an internal oscillator accurate to ±10% of 4MHz, which drives the SAR conversion process. The external SCLK is used solely for serial data readout (0–8MHz), decoupling conversion timing from host processor clock constraints - a key advantage in low-power or resource-constrained embedded systems.
How does the MAX1088EKA-T handle unipolar vs. bipolar input configurations?
The MAX1088EKA-T selects unipolar (0 to VREF) or bipolar (±VREF/2) mode via CNVST pin timing: a single high pulse configures unipolar; a high-low-high pulse sequence configures bipolar. In unipolar mode, output is straight binary; in bipolar mode, output is two's complement. This eliminates external level-shifting circuitry and simplifies firmware handling of bidirectional measurements.
What is the purpose of the two sub-bits (S1, S0) in the MAX1088EKA-T's 12-bit serial frame?
The MAX1088EKA-T outputs a 12-bit serial frame comprising 10 data bits (B9–B0) followed by two sub-bits (S1, S0). These sub-bits provide additional resolution beyond the 10-bit word - effectively extending measurement granularity for oversampling or dithering applications. They are always present and must be clocked out before initiating the next conversion to avoid mode misconfiguration.
Can the MAX1088EKA-T operate with a 3.3V supply?
No, the MAX1088EKA-T is rated exclusively for +4.75V to +5.25V operation (as confirmed by Absolute Maximum Ratings and Electrical Characteristics tables). For +3V operation, the pin-compatible MAX1089EKA-T is specified - it shares identical functionality and pinout but is optimized for 2.7V–3.6V supply and 2.5V reference. Using 3.3V on MAX1088EKA-T violates its VDD specification and risks parametric failure or damage.
MAX1088EKA-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:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Features:
- Internal Oscillator
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1088EKA-T FAQ
1.How can I place an order for MAX1088EKA-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1088EKA-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 MAX1088EKA-T reliable?
The price and inventory of MAX1088EKA-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1088EKA-T is usually 5 days.
3.What payment methods are accepted for MAX1088EKA-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1088EKA-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1088EKA-T?
MAX1088EKA-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1088EKA-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 MAX1088EKA-T?
For technical support, including MAX1088EKA-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1088EKA-T requirements.
6.How does Aetrix verify that MAX1088EKA-T is sourced from the original manufacturer or authorized distributors?
All MAX1088EKA-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 MAX1088EKA-T meets industry standards.
7.What is the process for return or replacement of MAX1088EKA-T?
All MAX1088EKA-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1088EKA-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 MAX1088EKA-T part is unused and in its original packaging.
Return procedure for MAX1088EKA-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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