MAX1069AEUD+T - 14-Bit 58.6ksps I2C SAR ADC | Analog Devices
MPN: MAX1069AEUD+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.42 | $6.42 |
| 10 | $5.78 | $57.80 |
| 100 | $5.05 | $505.00 |
| 500 | $4.39 | $2,195.00 |
| 1,000 | $3.78 | $3,780.00 |
MAX1069AEUD+T Overview
A SAR ADC is a successive-approximation-register analog-to-digital converter: a sample-and-hold captures the input, an internal DAC and comparator walk through each bit from MSB to LSB in one clock cycle per bit, and the digital result is latched out. SAR ADCs are valued for deterministic latency, low latency, no pipeline delay, and excellent DC accuracy. As a data converter, this device belongs to the broader hierarchy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor.
Key features include 14-bit resolution, 58.6 ksps sampling rate, single +2.7 V to +5.25 V analog supply, a 4.096 V internal reference, four address-select pins (ADD0-ADD3) that allow up to 16 MAX1069 devices on the same I2C bus, automatic power-down between conversions to minimize current draw, and an I2C/SMBus-compatible 2-wire serial interface. The TSSOP-14 footprint is one of the most common small-outline surface-mount packages in the TSSOP family of thin-shrink small-outline packages.
The architecture combines a capacitive-charge redistribution DAC with an on-chip clock and reference, eliminating most external components. Power-down currents drop to the sub-microamp region between conversions, making the part well suited to duty-cycled or battery-aware designs where the MCU wakes, takes a reading, and sleeps.
Typical applications include handheld portable instrumentation, medical instruments, battery-powered test equipment, solar-powered remote systems, received-signal-strength indicators (RSSI), and system supervision. Designers usually select the MAX1069AEUD+T when they need a small, low-power, 14-bit accurate ADC with an easy I2C interface and multi-drop addressing on a tightly board-constrained PCB.
When designing, observe the analog/digital supply decoupling guidance in the manufacturer datasheet, place the reference bypass capacitor close to REF, and keep the analog input traces short and guarded. Avoid driving the analog input beyond the supply rails to prevent ESD latch-up, and respect the maximum I2C clock rate of the chosen bus mode.
This page combines distributor pricing, drop-in pin-compatible alternatives, and practical design notes curated from the manufacturer datasheet, going beyond what the datasheet alone provides.
Drop-in alternatives for MAX1069AEUD+T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with MAX1069AEUD+T (same form factor and footprint) — differing in Resolution, Package, RoHS Status, Architecture, Analog Input Range.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1069AEUD+
✅ Drop-In✓ In Stock
$4.2 / Unit
View Datasheet →MAX1069BEUD+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1169CCUD+
✅ Drop-In✓ In Stock
$5.55 / Unit
View Datasheet →MAX1169BEUD+
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2309IF
✅ Drop-In✓ In Stock
$9.5 / Unit
View Datasheet →MAX1069AEUD+T Maximum Ratings & Electrical Characteristics
| Resolution | 14 bits |
| Sampling Rate | 58.6 ksps |
| Architecture | SAR (Successive Approximation) |
| Number of Input Channels | 1 single-ended |
| Input Type | Single-ended analog input |
| Analog Supply Voltage | +2.7 V to +5.25 V |
| Internal Reference Voltage | +4.096 V |
| Serial Interface | I2C-compatible 2-wire (Fast-mode and High-speed mode) |
| I2C Address Pins | ADD0-ADD3 (up to 16 devices on one bus) |
| On-Chip Clock | 4 MHz internal |
| Power-Down Mode | Automatic between conversions |
| Package | 14-pin TSSOP |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
MAX1069AEUD+T Pin Configuration
| Pin 1 | ADD0 — I2C address select bit 0 |
| Pin 2 | ADD1 — I2C address select bit 1 |
| Pin 3 | GND — Ground |
| Pin 4 | AIN — Analog input |
| Pin 5 | REF — Reference voltage input/output (+4.096 V internal) |
| Pin 6 | VDD — Analog supply voltage |
| Pin 7 | SCL — I2C serial clock input |
| Pin 8 | SDA — I2C serial data I/O |
| Pin 9 | ADD2 — I2C address select bit 2 |
| Pin 10 | ADD3 — I2C address select bit 3 |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | NC — Not connected (per datasheet) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
Typical Applications
MAX1069AEUD+T is suitable for 6 applications: Handheld Portable Instrumentation, Medical Instruments, Battery-Powered Test Equipment, Solar-Powered Remote Systems, Received-Signal-Strength Indicators (RSSI), System Supervision and Monitoring.
Handheld Portable Instrumentation
The MAX1069AEUD+T fits handheld portable instrumentation because its 14-bit resolution and 58.6 ksps sampling rate deliver deterministic SAR latency and ~13 ENOB typical for sensor readback. The on-chip 4.096 V reference and integrated 4 MHz clock remove the need for external precision components, shrinking BOM and board area. Automatic power-down between conversions drops the average current to the sub-100 uA region, directly extending battery runtime. With 16 user-selectable I2C addresses, multiple ADCs can monitor different transducers (temperature, pressure, strain) on a single host bus inside a handheld DMM or data-logger enclosure.
Recommended
Medical Instruments
The MAX1069AEUD+T is well suited to medical instruments such as portable pulse oximeters, glucose meters, and patient-side monitors where board space, low power, and reliable 14-bit accuracy are required. Its SAR architecture provides no-latency conversions critical for waveform monitoring, and the integrated 4.096 V reference simplifies calibration. The I2C interface allows the ADC to be placed close to the analog sensor (reducing analog-trace noise pickup) while the host MCU sits on the digital side of the board. The wide +2.7 V to +5.25 V supply range covers both 3.3 V coin-cell designs and 5 V USB-powered bedside units, and four address pins allow multi-parameter monitors to stack several ADCs on one bus.
Recommended
Battery-Powered Test Equipment
In battery-powered test equipment like insulation testers, handheld oscilloscope probes, and field-install multimeters, the MAX1069AEUD+T's automatic power-down and low average current maximize operating hours per charge. Its 14-bit resolution (with proper analog front-end design) supports accurate measurement of voltages, currents, and temperatures read through sensors. The 58.6 ksps throughput is fast enough to capture transient events such as inrush current or battery voltage sag. The 4.096 V internal reference gives a 250 uV LSB step at the ADC output, simplifying scaling math in firmware, while the 14-pin TSSOP package stays inside the compact enclosures typical of field instruments.
Recommended
Solar-Powered Remote Systems
The MAX1069AEUD+T is a strong fit for solar-powered remote systems such as environmental weather stations, agricultural soil sensors, and remote telemetry units where power budget is set by the daily solar yield. The automatic power-down mode lets the host MCU wake, take a single conversion, and return to deep sleep, keeping the ADC's average current contribution well below 1 mA. The wide +2.7 V to +5.25 V supply range is compatible directly with single-cell Li-ion / LiFePO4 batteries used in solar-energized systems. Four ADD pins allow stacking multiple ADCs to monitor battery voltage, panel current, and sensor channels independently, all on one low-pin-count host MCU I2C bus.
Recommended
Received-Signal-Strength Indicators (RSSI)
In RSSI applications for sub-GHz radios, cellular repeaters, and RF front-end monitoring, the MAX1069AEUD+T digitizes the logarithmic detector output of an RF receiver chain. With 14-bit resolution and 58.6 ksps sampling, the ADC captures fast RSSI transients during channel scans, and the SAR architecture guarantees a deterministic conversion time that simplifies host timing. The 14-pin TSSOP footprint fits the small RF front-end modules common in IoT gateways. Multiple MAX1069 devices on a single I2C bus let the host monitor several RF chains (main, diversity, or auxiliary) without adding digital isolators or extra GPIOs.
Recommended
System Supervision and Monitoring
The MAX1069AEUD+T is well suited to system supervision tasks such as board-level supply rail monitoring, temperature telemetry, and current-sensing in routers, base stations, and industrial controllers. The 4.096 V internal reference simplifies rail-monitor scaling (e.g. 12 V / 3 = 4.096 V at full scale with a simple resistor divider), and the 14-bit resolution gives 250 uV LSB steps - enough to detect sub-1% supply drift. The I2C address pins let one host monitor up to 16 different rails or temperatures with no extra glue logic. Combined with its TSSOP-14 footprint and lead-free/RoHS compliance, the part integrates cleanly into compact, high-density supervisory boards.
Recommended
Recommended Products Summary
Engineering reference data for MAX1069AEUD+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1069AEUD+ | MAX1069BEUD+T | MAX1169CCUD+ | MAX1169BEUD+ | LTC2309IF |
|---|---|---|---|---|---|---|
| Package | TSSOP-14 | TSSOP-14 - same | TSSOP-14 - same | TSSOP-14 - same | TSSOP-14 - same | TSSOP-14 - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 14 bits | 14 bits | 12 bits | 16 bits | 16 bits | 12 bits |
| Sampling Rate | 58.6 ksps | 58.6 ksps | 58.6 ksps | 58.6 ksps | 58.6 ksps | 14 ksps |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Internal Reference | +4.096 V | +4.096 V | +4.096 V | +4.096 V | +4.096 V | external reference |
| Serial Interface | I2C 2-wire (Fast/HS mode) | I2C 2-wire | I2C 2-wire | I2C 2-wire | I2C 2-wire | SPI/I2C selectable |
| Number of Input Channels | 1 | 1 | 1 | 1 | 1 | 8 |
| On-Chip Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | internal |
Key Differentiators
- 16-device I2C multi-drop addressability (vs MAX1069BEUD+T)
- 14-bit resolution at 58.6 ksps in TSSOP-14 (vs LTC2309IF)
- Integrated 4.096 V reference and 4 MHz clock (vs MAX1169CCUD+)
Design Notes
Estimated: the MAX1069AEUD+T supply current is dominated by the analog front end and the 4.096 V reference. At 5 V VDD and 58.6 ksps continuous sampling, the device draws a few mA; in power-down between conversions the supply current drops well under 100 uA. Place a 1 uF ceramic decoupling capacitor as close as possible to the VDD pin and a 0.1 uF ceramic on REF to keep the internal reference stable. For battery-powered designs, duty-cycle the conversions - wake, take a single reading, return to power-down - to keep average current in the tens of microamps.
Keep the analog input trace (AIN) short and guarded by a ground pour on both sides to minimize digital-coupling noise. Route the I2C SCL/SDA traces away from switching nodes and clock lines. The four ADD0-ADD3 pins must be tied cleanly to VDD or GND - do not leave them floating, or the I2C address becomes indeterminate. Place the reference bypass capacitor (typically 0.1 uF) within 1-2 mm of the REF pin to prevent reference-voltage ringing during conversions.
Do not drive AIN above VDD or below GND - the input is not over-voltage tolerant and ESD latch-up can result. Confirm that the I2C pull-up resistors are sized for the chosen bus mode: standard mode uses 4.7 kohm, fast mode uses 2.2-4.7 kohm, and high-speed mode (1.7 MHz) requires smaller values per the I2C specification. Verify that the host's I2C controller supports the requested clock rate, and ensure the slave address configured via ADD0-ADD3 does not collide with any other device on the bus.
Compliance Information
RoHS compliant and lead-free per Analog Devices product page. Not AEC-Q100 qualified (industrial-grade ADC). Halogen-free status not explicitly stated in the verified web data.
