MAX111BEAP+ - 14-Bit 2-Ch Sigma-Delta ADC, Serial | Maxim Integrated
Teilenummer: MAX111BEAP+ ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $13.91 | $13,91 |
| 10 | $12.55 | $125,50 |
| 100 | $11.2 | $1.120,00 |
| 500 | $10.1 | $5.050,00 |
| 1.000 | $9.45 | $9.450,00 |
MAX111BEAP+ Übersicht
A sigma-delta ADC is a type of oversampling converter that uses a high-frequency modulator and digital filtering to achieve high resolution from low-precision analog components. Compared to successive-approximation register (SAR) ADCs, sigma-delta parts trade absolute sample rate for excellent noise immunity and inherent digital averaging, which makes them ideal for precision DC and low-bandwidth measurements in instrumentation, industrial control, and sensor signal-chain applications. The MAX111 sits within the broader hierarchy of ADC > data converter > signal-chain IC > analog semiconductor.
Key specifications of the MAX111BEAP+ include ±14-bit resolution (with sign bit + overrange), 2 differential input channels, an integral nonlinearity (INL) of ±2 LSB max, and a typical signal-to-noise plus distortion ratio (SINAD) above 78 dB. It accepts bipolar input ranges configured via external resistors and operates from a single +5V analog supply with a separate digital supply pin for mixed-voltage systems. The 3-wire serial interface is compatible with SPI, QSPI, and MICROWIRE protocols.
The internal modulator runs at a high oversampling ratio and is followed by a digital decimation filter, which suppresses wideband noise and provides 50 Hz/60 Hz mains-rejection at the appropriate output word rate. Calibration registers correct offset and gain error on demand, eliminating the need for trimming potentiometers on the PCB. The reference input accepts an external 2.5 V to 5 V source, and the on-chip reference buffer drives the modulator directly.
Typical applications include load-cell scales and weighing systems, pressure and strain-gauge instrumentation, industrial process control loops, portable battery-powered meters, temperature measurement using thermocouples or RTDs, and 4 mA to 20 mA current-loop digitizers in factory automation. The wide dynamic range and built-in calibration simplify designs that previously required precision analog front-end components.
When designing with this ADC, pay attention to input common-mode voltage and the analog/digital supply decoupling network. Place 0.1 µF ceramic bypass capacitors as close as possible to the AVDD and DVDD pins, and use a low-impedance ground plane to keep digital switching noise out of the analog modulator. Because the device operates from a single +5 V supply, level shifting may be required when interfacing to 3.3 V microcontrollers; in those cases, a small series resistor on DOUT often suffices.
This page synthesizes distributor pricing, drop-in same-package alternatives, design considerations, and application guidance in one place to help engineers evaluate the MAX111BEAP+ without cross-referencing multiple datasheets.
Drop-in-Alternativen für MAX111BEAP+ – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
MAX111BCAP+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX111AEAP+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX111BCAP-T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX111BEAP-T
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX1110EAP+
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
MAX111BEAP+ Grenzwerte & elektrische Eigenschaften
| Auflösung | 14-bit + sign + overrange (±14-bit) |
| Number of Channels | 2 (differential) |
| ADC Architecture | Sigma-Delta |
| Output Interface | Serial (SPI/QSPI/MICROWIRE compatible) |
| Analog Supply Voltage (AVDD) | +5 V (±5%) |
| Digital Supply Voltage (DVDD) | +5 V (±5%) |
| Supply Current (Normal) | 550 µA typical |
| Supply Current (Power-Down) | 4 µA typical |
| Integral Nonlinearity (INL) | ±2 LSB max |
| Reference Voltage Range | 2.5 V to 5 V (external) |
| Eingangsspannungsbereich | Bipolar, set by external resistors and VREF |
| Betriebstemperaturbereich | -40 °C to +85 °C (E temp grade) |
| Gehäuse | 20-SSOP (5.30 mm body width) |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
| Internal Calibration | Yes (auto-calibration, no external trim) |
MAX111BEAP+ Pin-Konfiguration
| Pin 1 | AVDD — Analog +5 V supply |
| Pin 2 | CH1+ — Channel 1 positive differential input |
| Pin 3 | CH1- — Channel 1 negative differential input |
| Pin 4 | CH2+ — Channel 2 positive differential input |
| Pin 5 | CH2- — Channel 2 negative differential input |
| Pin 6 | REF+ — Reference voltage positive input |
| Pin 7 | REF- — Reference voltage negative / analog ground sense |
| Pin 8 | AGND — Analog ground |
| Pin 9 | CAL — Calibration control input |
| Pin 10 | PD — Power-down input (active high) |
| Pin 11 | DGND — Digital ground |
| Pin 12 | DOUT — Serial data output |
| Pin 13 | SCLK — Serial clock input |
| Pin 14 | CS — Chip select input (active low) |
| Pin 15 | DVDD — Digital +5 V supply |
| Pin 16 | NC — Not connected (per datasheet) |
| Pin 17 | NC — Not connected (per datasheet) |
| Pin 18 | NC — Not connected (per datasheet) |
| Pin 19 | NC — Not connected (per datasheet) |
| Pin 20 | NC — Not connected (per datasheet) |
Typische Anwendungen
MAX111BEAP+ ist geeignet für 6 Anwendungs: Load-Cell Weighing Scale, Strain-Gauge Pressure Transducer, Thermocouple Temperature Measurement, Industrial 4-20 mA Current-Loop Digitizer, Portable Battery-Powered Meter, Process Control Sensor Front-End.
Load-Cell Weighing Scale
The MAX111BEAP+ fits weighing-scale designs because its 14-bit sigma-delta resolution and ±2 LSB INL give repeatable readings across the full load-cell output range (typically 0-30 mV full-scale). Its 2-channel differential input accepts the bridge output directly with no instrumentation amplifier front-end, while the digital decimation filter suppresses 50 Hz/60 Hz mains noise that would otherwise drift scale zero. Power consumption at 550 µA keeps battery-powered scales awake for hundreds of hours per charge.
Empfohlen
Strain-Gauge Pressure Transducer
Pressure transducers using bonded strain gauges produce millivolt-level differential outputs at low bandwidth, an ideal match for the MAX111BEAP+'s oversampling sigma-delta architecture. The 2-channel input allows simultaneous pressure and temperature compensation on a single ADC, eliminating the offset drift that dominates high-precision pressure measurements. The internal auto-calibration routine removes gain and offset error at every power-up, so no production-line trimming is required.
Empfohlen
Thermocouple Temperature Measurement
Type K, J, and T thermocouples generate microvolt-per-degree outputs that demand high-resolution, low-noise digitizing - the MAX111BEAP+'s 14-bit oversampling converter delivers effective resolution in the 0.1 °C range when averaged over its digital filter window. The bipolar input range handles the negative Seebeck coefficients of iron-constantan thermocouples without external level shifting. Combined with on-chip cold-junction compensation support, it provides a complete thermocouple front-end in one IC.
Empfohlen
Industrial 4-20 mA Current-Loop Digitizer
The MAX111BEAP+ is well suited for digitizing 4-20 mA current loops when paired with a precision 250 Ω shunt resistor - the resulting 1-5 V input maps cleanly into the ADC's input range. Its 2-channel input supports simultaneous loop measurement and loop power-supply voltage monitoring for fault diagnostics. The 550 µA supply current is negligible compared with the loop's 4 mA minimum, so the digitizer does not perturb the loop itself.
Empfohlen
Portable Battery-Powered Meter
Battery-powered handheld meters benefit from the MAX111BEAP+'s 4 µA power-down current, which drops total quiescent draw during sleep intervals to levels that preserve multi-year shelf life. The serial SPI interface connects directly to low-power microcontrollers such as the MAX32620 or PIC16 families, requiring only three pins for full data transfer. The 5 V supply rail can be generated from a single lithium-thionyl-chloride cell using a small boost converter.
Empfohlen
Process Control Sensor Front-End
In factory automation PLCs and DCS analog input modules, the MAX111BEAP+ provides high-isolation, multi-channel measurement when paired with transformer-isolated front-end signal conditioning. The 2 differential inputs accept ±VREF bipolar signals directly from instrumentation amplifiers, and the sigma-delta modulator's inherent digital averaging eliminates periodic noise from motor drives and switching solenoids on the factory floor. The 3-wire serial interface simplifies optocoupler-based isolation.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für MAX111BEAP+ – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | MAX111BCAP+ | MAX111AEAP+ | MAX111BCAP-T | MAX111BEAP-T | MAX1110EAP+ |
|---|---|---|---|---|---|---|
| Brand | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated |
| Package | 20-SSOP (5.30 mm body) | 20-SSOP (5.30 mm body) - same | 20-SSOP (5.30 mm body) - same | 20-SSOP (5.30 mm body) - same | 20-SSOP (5.30 mm body) - same | 20-SSOP (5.30 mm body) - same |
| Resolution | 14-bit + sign + overrange | 14-bit + sign + overrange | 14-bit + sign + overrange | 14-bit + sign + overrange | 14-bit + sign + overrange | 12-bit (-14% vs target) |
| Channels | 2 differential | 2 differential | 2 differential | 2 differential | 2 differential | 8 single-ended (+300%) |
| Architecture | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta | Sigma-Delta | SAR |
| Operating Temperature | -40 °C to +85 °C (industrial) | 0 °C to +70 °C (commercial) | -40 °C to +85 °C (industrial) | 0 °C to +70 °C (commercial) | -40 °C to +85 °C (industrial) | -40 °C to +85 °C (industrial) |
| Interface | 3-wire Serial (SPI/QSPI/MICROWIRE) | 3-wire Serial (SPI/QSPI/MICROWIRE) | 3-wire Serial (SPI/QSPI/MICROWIRE) | 3-wire Serial (SPI/QSPI/MICROWIRE) | 3-wire Serial (SPI/QSPI/MICROWIRE) | Parallel/SPI selectable |
| Approx 1ku Price | $13.91 (manufacturer list) | Lower (commercial grade) | Higher (A-grade calibration) | Lower (T&R commercial) | Similar (T&R industrial) | Lower (12-bit, lower res) |
Wichtigste Unterscheidungsmerkmale
- Industrial -40 to +85 °C temperature grade (vs. MAX111BCAP+)
- 14-bit sigma-delta resolution with no external trim (vs. MAX1110EAP+)
- Differential bipolar input for direct sensor connection (vs. MAX1110EAP+)
Designhinweise
Place a 0.1 µF ceramic bypass capacitor as close as possible to both AVDD (pin 1) and DVDD (pin 15), and add a bulk 10 µF tantalum or aluminum-polymer capacitor on each supply rail. Per the Maxim MAX111 datasheet, the analog and digital grounds should be tied at a single point under the IC to avoid ground-loop noise injection. Estimated: with a 5 V supply and 550 µA analog current, the supply-rejection budget must reject at least 60 dB of digital switching noise to keep ADC noise below 1 LSB.
Route the CH1+/CH1- and CH2+/CH2- differential traces as matched-length pairs with continuous ground shielding, and avoid routing digital signals (SCLK, DOUT, CS) directly across the analog input traces. The 20-SSOP land pattern must use the 5.30 mm body width specified in the Maxim package drawing; using a narrower SSOP-20 land pattern (e.g., 3.9 mm) will not match the package. Estimated: differential trace impedance of 100 Ω differential with 50 Ω single-ended is recommended for cables longer than 50 mm.
When interfacing the MAX111BEAP+ to a 3.3 V microcontroller, add a small series resistor (typically 100 Ω to 1 kΩ) on the DOUT line to limit ringing and a logic-level translator if the microcontroller cannot tolerate 5 V inputs. Per the datasheet, the digital interface is not 5 V-tolerant on 3.3 V rails, so a level shifter such as the MAX3370 may be required for mixed-voltage designs. The CS pin should be pulled high between conversions to keep DOUT in a high-impedance state and prevent bus contention.
Do not connect any input channel to a voltage outside the AVDD/AGND range without external protection resistors - the input ESD diodes will clamp and inject measurement error. Do not omit the CAL pin pull-up - leaving it floating produces inconsistent calibration results. Do not operate the part without an external reference voltage applied to REF+/REF-, as internal calibration will fail and readings will drift over temperature. Estimated: the input bias current is typically <1 nA, so any source impedance below 10 kΩ is acceptable without measurable gain error.
Compliance-Informationen
RoHS and lead-free per Analog Devices/Maxim Integrated product page. Not AEC-Q100 qualified (industrial temp grade, not automotive). Halogen-free status not explicitly stated in the verified distributor data - set to unknown.
