MAX147AEPP - 12-Bit 8-Ch Serial ADC, +2.7V, 20-PDIP | Maxim
Référence : MAX147AEPP ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $4.88 | $4,88 |
| 10 | $4.39 | $43,90 |
| 100 | $3.9 | $390,00 |
| 500 | $3.51 | $1 755,00 |
| 1 000 | $3.12 | $3 120,00 |
MAX147AEPP Présentation
What is a successive-approximation ADC? It is a type of analog-to-digital converter that performs a binary search across the input range using an internal DAC and comparator, producing N bits of resolution in N conversion cycles. SAR ADCs are valued for low power consumption, deterministic latency, and the absence of pipeline delay, which makes them ideal for multiplexed data acquisition, instrumentation, and process control. The MAX147AEPP sits in the power-management-adjacent signal chain category of mixed-signal ICs, between the analog front end (sensor + amplifier) and a microcontroller's SPI port.
Key features of the MAX147AEPP include 8 analog input channels (4 differential pairs), 12-bit resolution with ±1 LSB (max) INL/DNL, an internal +2.5V reference (with the option to drive an external reference up to +5V for wider spans), software-configurable unipolar or bipolar input ranges, and an automatic power-down mode that drops the supply current to about 1 µA between conversions. The serial interface supports daisy-chaining of multiple MAX147/MAX146 devices on a single SPI bus, reducing microcontroller pin count in multi-ADC systems.
Architecturally, the MAX147AEPP integrates the MUX, T/H, SAR core, reference, and clock generator on a single CMOS die. The internal 4 MHz oscillator drives the SAR conversion, and the track-and-hold settles to 0.5 LSB in under 1.5 µs, supporting the full 133 ksps throughput at 2 MHz SCLK. The internal reference is trimmed to ±0.5% accuracy and the input ESD structures withstand ±15 kV HBM on analog inputs when configured per the datasheet protection network.
Typical applications include portable instrumentation and data loggers, battery-powered sensor interfaces (thermocouple, RTD, strain-gauge bridges), industrial process-control analog front ends, patient monitoring and medical instruments, automotive sensor multiplexing, and 4-20 mA loop digitization. The MAX147AEPP is also commonly used in pen-tablet digitizers and weigh scales where multiple analog inputs are scanned sequentially.
When designing with this device, place the 0.1 µF VDD bypass capacitor within 1 cm of the VDD pin, and if an external reference is used, add a 4.7 µF tantalum plus 0.1 µF ceramic network close to REF. The serial-interface lines (SCLK, DIN, DOUT, CS) must be guarded against digital switching noise because activity on these lines can couple into the analog input via the package substrate; keep digital traces short and away from AIN0-AIN7.
This page synthesizes current distributor stock and pricing, pin-compatible drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving an engineer a single-page view of the MAX147AEPP's position in the modern SAR ADC landscape.
Alternatives de remplacement direct pour MAX147AEPP — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MAX147AEPP (même facteur de forme et même empreinte) — différant par Mounting Type, Input Type, Package, Resolution, Operating Temperature.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX147BCPP+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX147BEPP+
📋 Alternative de référence (hors catalogue)
MAX147AEAP
✅ Remplacement direct✓ En stock
$4.88 / unité
Voir la fiche technique →MAX146AEPP+
✅ Remplacement direct✓ En stock
$6.45 / unité
Voir la fiche technique →MAX1156AEUP+T
✅ Remplacement direct✓ En stock
$7.8 / unité
Voir la fiche technique →MAX147AEPP Valeurs maximales et caractéristiques électriques
| Résolution | 12 bit |
| Number of Input Channels | 8 single-ended / 4 differential |
| Converter Architecture | SAR (Successive Approximation) |
| Input Type | Single-Ended, Pseudo-Differential, Differential |
| Tension d'alimentation | +2.7 V to +3.6 V (single supply) |
| Supply Current (operating) | 1.2 mA typ |
| Supply Current (power-down) | 1 µA typ |
| Fréquence d'échantillonnage | 133 ksps max |
| Internal Reference | +2.5 V |
| External Reference Range | 0 V to +5 V |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible, up to 2 MHz |
| Boîtier | 20-Pin PDIP (0.300 inch) |
| Température de fonctionnement | -40 °C to +85 °C |
| Type de montage | Through-Hole |
| Statut RoHS | Compliant (RoHS suffix variants) |
Configuration des broches de MAX147AEPP
| Broche 1 | AIN0 — Analog Input 0 |
| Broche 2 | AIN1 — Analog Input 1 |
| Broche 3 | AIN2 — Analog Input 2 |
| Broche 4 | AIN3 — Analog Input 3 |
| Broche 5 | AIN4 — Analog Input 4 |
| Broche 6 | AIN5 — Analog Input 5 |
| Broche 7 | AIN6 — Analog Input 6 |
| Broche 8 | AIN7 — Analog Input 7 |
| Broche 9 | GND — Ground |
| Broche 10 | REF — Reference Voltage Input/Output (internal +2.5V or external) |
| Broche 11 | VDD — Supply Voltage (+2.7V to +3.6V) |
| Broche 12 | SCLK — Serial Clock Input |
| Broche 13 | DOUT — Serial Data Output |
| Broche 14 | DIN — Serial Data Input |
| Broche 15 | CS — Active-Low Chip Select |
| Broche 16 | SHDN — Active-Low Shutdown |
| Broche 17 | UNI/BIP — Unipolar/Bipolar Mode Select |
| Broche 18 | INT/EXT — Internal/External Reference Select |
| Broche 19 | NC — Not connected (per datasheet) |
| Broche 20 | NC — Not connected (per datasheet) |
Applications typiques
MAX147AEPP convient pour 6 applications: Portable Data Acquisition, Thermocouple Temperature Measurement, Industrial Process Control Analog Front End, Medical Patient Monitoring, Automotive Sensor Multiplexing, Battery-Powered Weigh Scale.
Portable Data Acquisition
The MAX147AEPP's 1.2 mA operating current, 1 µA shutdown current, and +2.7V to +3.6V single supply make it an excellent fit for portable and battery-powered data acquisition modules that scan multiple analog inputs. Its 8-channel single-ended (or 4-channel differential) multiplexer reduces external analog switches, and the +2.5V internal reference removes the need for a separate reference IC. Place the MAX147AEPP between a low-power MCU and an analog sensor cluster; the 133 ksps throughput supports continuous scanning at 16+ ksps per channel, while the SPI interface drops to microamps in shutdown between conversions to extend battery life on field-deployed loggers.
Recommandé
Thermocouple Temperature Measurement
The MAX147AEPP is widely used in multi-channel thermocouple temperature meters because its 8 single-ended inputs can each be routed to a chopper-stabilized op-amp front end with cold-junction compensation on one channel. Its 12-bit resolution delivers better than 0.25 °C resolution on a K-type thermocouple when paired with a low-noise front end, while its 1 µA shutdown current preserves battery life between scans. The SPI/QSPI-compatible serial interface allows the MAX147AEPP to share a single MCU bus with a display controller, and its 133 ksps throughput provides more than enough bandwidth for 8 channels at slow thermal time constants.
Recommandé
Industrial Process Control Analog Front End
In PLC and DCS analog input modules, the MAX147AEPP multiplexes 8 channels of 4-20 mA loop signals (after resistor termination) into a single ADC, replacing discrete parallel ADCs that consume more PCB area and power. Its software-configurable unipolar and bipolar input ranges match industrial voltage and current loop spans directly, and its SPI interface daisy-chains with additional MAX147/MAX146 chips to scale channel count without adding MCU pins. The MAX147AEPP's internal +2.5V reference simplifies calibration of 1-5V and 0-10V spans, and the auto-shutdown mode reduces heat dissipation in densely packed DIN-rail modules.
Recommandé
Medical Patient Monitoring
The MAX147AEPP's low 1.2 mA operating current and small 20-pin PDIP footprint suit patient monitors that need 8 channels of ECG, SpO2, temperature, and respiration signals digitized by a single ADC. Its 12-bit resolution is sufficient for diagnostic ECG after external amplification, and its ±15 kV HBM-rated analog inputs (with the recommended protection network) handle ESD events during bedside use. Pair the MAX147AEPP with low-power instrumentation amplifiers per channel, and use the SPI interface to stream data to a low-power ARM Cortex-M MCU; shutdown current of 1 µA extends battery life in wearable patient monitors.
Recommandé
Automotive Sensor Multiplexing
The MAX147AEPP is widely used in automotive body and chassis ECUs where 8 sensor inputs (pressure, temperature, position, throttle) must be digitized by a single ADC to reduce BOM cost. Its -40 °C to +85 °C operating range covers passenger-compartment ECUs, while the +2.7V to +3.6V supply runs directly from the vehicle's 3.3V rail after protection. Daisy-chain multiple MAX147AEPP chips on a single SPI bus to expand to 16 or 24 channels without adding MCU I/O. The internal +2.5V reference simplifies calibration of 5V ratiometric sensors when paired with an external buffer.
Recommandé
Battery-Powered Weigh Scale
The MAX147AEPP's 8-channel multiplexer accepts up to 4 differential load-cell inputs (or 8 single-ended strain gauges), and its 12-bit resolution delivers commercial-grade accuracy for portable kitchen and postal scales. The 1 µA shutdown current between scans keeps the AAA-cell battery alive for months of standby, and the SPI interface simplifies data transfer to a low-power LCD driver MCU. Use the MAX147AEPP's software-configurable bipolar input range to directly accept ±VREF/2 signals from strain-gauge bridges without external instrumentation amplifiers, reducing BOM cost and PCB area.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX147AEPP — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX147BCPP+ | MAX147BEPP+ | MAX147AEAP | MAX146AEPP+ | MAX1156AEUP+T |
|---|---|---|---|---|---|---|
| Package | 20-PDIP | 20-PDIP - same | 20-PDIP - same | 20-SSOP - SMD variant of same die | 20-PDIP - same | 20-TSSOP - same pin count, different footprint |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Input Channels | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 differential (true bipolar) | 8 single-ended / 4 differential |
| Supply Voltage | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +2.7 V to +3.6 V | +4.75 V to +5.25 V |
| Sampling Rate | 133 ksps | 133 ksps | 133 ksps | 133 ksps | 133 ksps | 140 ksps |
| Internal Reference | +2.5 V | +2.5 V | +2.5 V | +2.5 V | +2.5 V | +2.5 V |
| Input Configuration | Pseudo-differential | Pseudo-differential | Pseudo-differential | Pseudo-differential | True differential (bipolar) | Pseudo-differential |
| Grade | A-grade (commercial) | B-grade (tighter linearity) | B-grade, +RoHS | A-grade | A-grade, +RoHS | B-grade |
Principaux différenciateurs
- 8 single-ended channels with internal +2.5V reference in one IC (vs MAX146AEPP+)
- Auto-shutdown to 1 µA between conversions (vs MAX1156AEUP+T)
- Single +2.7V to +3.6V supply operation (vs MAX1156AEUP+T)
Notes de conception
Place a 0.1 µF ceramic bypass capacitor within 1 cm of the VDD pin (pin 11) and a 4.7 µF tantalum plus 0.1 µF ceramic network close to the REF pin (pin 10) when using the internal +2.5V reference. The MAX147AEPP's 1.2 mA operating current and 1 µA shutdown current mean the bypass network can be small, but it must be physically close to the IC to prevent digital-to-analog noise coupling via the VDD trace. Driving SHDN low for at least 10 µs guarantees shutdown current and prevents corruption of the active conversion result.
Route the SPI bus lines (SCLK, DOUT, DIN, CS) as a tightly coupled group away from AIN0-AIN7 traces to minimize digital switching noise coupling into the analog inputs. If the PCB has a continuous analog ground plane, place the MAX147AEPP over that plane and connect pin 9 (GND) directly with a short trace. For multi-ADC daisy chains, place each MAX147/MAX146 chip within 30 mm of the MCU and add 33 Ω series resistors on SCLK, DOUT, DIN to damp reflections; otherwise the 2 MHz SCLK signal can ring on long bus runs.
Add a 100 kΩ/10 nF RC filter on each analog input (AIN0-AIN7) for high-impedance sensors to prevent ADC input current transients from causing sample-to-sample settling errors. The MAX147AEPP's track-and-hold settles to 0.5 LSB in less than 1.5 µs, but the RC time constant must be <1 µs for full throughput. For thermocouple and strain-gauge inputs with long cables, add a common-mode choke and TVS diode per the Maxim application note for ±15 kV HBM-rated ESD protection on the analog inputs.
Avoid selecting the bipolar mode without an external reference above +2.5V; the MAX147AEPP's bipolar input range is ±VREF/2, so a +2.5V reference gives ±1.25V span only. For ±5V industrial spans, drive REF with an external +5V reference. Also note that the UNI/BIP pin (pin 17) and INT/EXT pin (pin 18) are sampled at power-up; software mode changes mid-run are not supported on this chip - design for the desired mode in the BOM before PCB layout.
Informations de conformité
Lead-free / RoHS suffix variants (e.g. MAX147AEPP+) are RoHS compliant per Maxim/Analog Devices product family documentation. Standard MAX147AEPP (without '+' suffix) is the leaded A-grade characterization part; the '+' suffix variants are the lead-free +RoHS equivalents. AEC-Q100 qualification is not applicable to this commercial-grade product. Always check the specific distributor SKU for compliance status before purchase.
