MAX1147BEUP+T - 14-Bit 4Ch 116ksps 3.3V Precision ADC | Maxim
MPN: MAX1147BEUP+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.5 | $14.50 |
| 10 | $13.05 | $130.50 |
| 100 | $11.6 | $1,160.00 |
| 500 | $10.15 | $5,075.00 |
| 1,000 | $8.7 | $8,700.00 |
MAX1147BEUP+T Overview
An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a binary-search algorithm and an internal DAC to resolve analog inputs. SAR ADCs sit within the broader hierarchy of data converters (ADC -> data converter -> mixed-signal IC -> semiconductor) and are valued for their deterministic latency, low power consumption, and inherent simplicity compared to delta-sigma or pipeline architectures. The MAX1147 family (MAX1146/MAX1147/MAX1148/MAX1149) shares a common 20-pin TSSOP pinout, with supply-voltage and channel-count differences distinguishing the variants.
Key features of the MAX1147BEUP+T include ±1 LSB INL and DNL, an internal +2.5V reference (or optional external reference), a hardware-/software-/external-clock shutdown mode that reduces supply current to sub-microampere levels, and an SPI/QSPI/MICROWIRE-compatible serial interface. Its 20-pin TSSOP package, surface-mount gull-wing terminals, and industrial temperature grade (-40C to +85C) suit it for compact, cost-sensitive precision-instrumentation boards.
Typical applications include portable data logging, patient monitoring, factory-automation sensor interfaces, pen-digitizer digitizers, and 4–20 mA loop-powered instruments. Designers should consider shutdown-mode current when budgeting battery life, and ensure the analog inputs remain within the supply rails to avoid linearity degradation.
Drop-in alternatives for MAX1147BEUP+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 MAX1147BEUP+T (same form factor and footprint) — differing in Package, Resolution, Number of Channels, Operating Temperature, Analog Supply Voltage.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX1147BCUP+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1147BEUP-T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1147BEUP+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1148BEUP+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1146BEUP+T
✅ Drop-In📋 Reference alternative (not in catalog)
AD7942BRUZ
✅ Drop-In📋 Reference alternative (not in catalog)
MAX1147BEUP+T Maximum Ratings & Electrical Characteristics
| Resolution | 14 bit |
| Number of Channels | 4 single-ended / 2 differential |
| Sampling Rate | 116 ksps |
| Supply Voltage | +2.7 V to +3.6 V |
| Supply Current (typ at 116 ksps) | 0.6 mA |
| Shutdown Current | < 1 µA |
| INL (max) | ±1 LSB |
| DNL (max) | ±1 LSB |
| Input Range (single-ended) | 0 V to VREF |
| Input Range (true-differential) | ±VREF |
| Internal Reference | +2.5 V |
| External Reference Range | +1.0 V to +3.0 V |
| Interface | SPI/QSPI/MICROWIRE-compatible serial |
| Package | 20-pin TSSOP (EUP) |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
MAX1147BEUP+T Pin Configuration
| Pin 1 | SCLK — Serial-clock input |
| Pin 2 | DOUT — Serial-data output |
| Pin 3 | DIN — Serial-data input |
| Pin 4 | CS — Active-low chip-select input |
| Pin 5 | SHDN — Active-low shutdown input |
| Pin 6 | AGND — Analog ground |
| Pin 7 | AVDD — Analog +2.7V to +3.6V supply |
| Pin 8 | REF — Internal +2.5V reference / external reference input |
| Pin 9 | DVDD — Digital +2.7V to +3.6V supply |
| Pin 10 | DGND — Digital ground |
| Pin 11 | AIN0 — Analog input channel 0 |
| Pin 12 | AIN1 — Analog input channel 1 |
| Pin 13 | AIN2 — Analog input channel 2 |
| Pin 14 | AIN3 — Analog input channel 3 |
| Pin 15 | NC — Not connected (per datasheet) |
| 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) |
Typical Applications
MAX1147BEUP+T is suitable for 6 applications: Portable Data Logging, Patient Monitoring and Medical Instruments, Factory Automation and Sensor Interfaces, Pen-Digitizer and Touch Digitizers, 4-20 mA Loop-Powered Sensor Transmitters, HMI Touch-Screen and Front-Panel Interfaces.
Portable Data Logging
The MAX1147BEUP+T suits battery-powered data loggers where 4 single-ended inputs and 14-bit resolution are sufficient for thermocouples, RTDs, or strain-gauge channels. Its 0.6 mA active current at 116 ksps and < 1 µA shutdown current let designers duty-cycle acquisitions, extending battery life on 3.3V coin cells. Place a 10 µF tantalum plus 0.1 µF ceramic bypass on AVDD/DVDD, and use the SHDN-bar pin to enter standby between conversions. The internal +2.5V reference eliminates an external reference IC, reducing BOM cost and board area in compact logger designs.
Recommended
Patient Monitoring and Medical Instruments
The MAX1147BEUP+T fits patient-monitoring front-ends where 4 true-differential channels and ±1 LSB linearity are required for ECG, EEG, or pulse-oximetry signal chains. Its 116 ksps sampling rate is more than adequate for physiological signals (typically 1 ksps after decimation), and the SPI/QSPI/MICROWIRE-compatible interface allows direct connection to low-power microcontrollers like the MAX32620. Pair the ADC with an instrumentation amplifier (e.g., MAX4194) and low-pass filter, and use the internal +2.5V reference to bias the analog signal chain symmetrically around 1.25V for true-differential operation.
Recommended
Factory Automation and Sensor Interfaces
For factory-automation systems, the MAX1147BEUP+T provides 4 isolated or non-isolated sensor channels with 14-bit resolution for pressure, flow, or level transmitters. Its 3.3V supply aligns with industrial 3.3V PLC and sensor-hub designs, and the internal multiplexer simplifies board layout by reducing trace routing to a single ADC. The shutdown mode (< 1 µA) supports Energy Star-compliant field instruments. Use the differential-input mode to reject common-mode noise from motor drives and 24V industrial buses; pair with a digital isolator such as the MAX14850 for galvanic isolation between the field side and the controller.
Recommended
Pen-Digitizer and Touch Digitizers
The MAX1147BEUP+T digitizes the 4-axis (X1, X2, Y1, Y2) analog signals from a pen-digitizer tablet with sufficient speed and resolution to track pen strokes at 116 ksps. Its 14-bit resolution provides 16,384 discrete positions per axis, exceeding the resolution needed for handwriting recognition and signature capture. Use the shutdown pin to disable the ADC between pen events, and the internal +2.5V reference to bias the resistive-sensor bridge. The 20-TSSOP package is small enough to integrate into a stylus or tablet PC, and the SPI interface allows direct connection to USB HID controllers.
Recommended
4-20 mA Loop-Powered Sensor Transmitters
The MAX1147BEUP+T digitizes 4–20 mA loop-powered sensor signals with 14-bit resolution, making it suitable for industrial process-control transmitters (pressure, temperature, level). Its low 0.6 mA active current is well within the 4 mA loop headroom budget, leaving enough current for the rest of the analog front end. Use the differential-input mode to reject ground-loop noise from long field wiring, and pair with a 4–20 mA current loop transmitter (e.g., MAX5216 16-bit DAC) to build a complete smart sensor. The shutdown mode reduces power consumption during calibration cycles, improving energy efficiency in remote installations.
Recommended
HMI Touch-Screen and Front-Panel Interfaces
The MAX1147BEUP+T digitizes analog signals from HMI front-panel rotary encoders, slider potentiometers, and resistive touch-screen overlays. With 4 channels and 116 ksps sampling, it can simultaneously read two axes of touch position plus two control knobs, all from a single IC. The 3.3V supply matches modern ARM Cortex-M microcontrollers, and the SPI interface requires only 4 wires plus chip-select, leaving GPIOs free for other HMI functions. Use the internal +2.5V reference to bias the resistive touch-screen 4-wire interface, simplifying the BOM and reducing cost compared to dedicated touch-screen controllers.
Recommended
Recommended Products Summary
Engineering reference data for MAX1147BEUP+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX1147BCUP+ | MAX1147BEUP-T | MAX1148BEUP+T | MAX1146BEUP+T | AD7942BRUZ |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Analog Devices |
| Package | TSSOP-20 | TSSOP-20 - same | TSSOP-20 - same | TSSOP-20 - same | TSSOP-20 - same | TSSOP-20 - same |
| Resolution | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit | 14 bit |
| Number of Channels | 4 SE / 2 Diff | 4 SE / 2 Diff | 4 SE / 2 Diff | 8 SE / 4 Diff | 4 SE / 2 Diff | 1 channel |
| Sampling Rate | 116 ksps | 116 ksps | 116 ksps | 140 ksps | 135 ksps | 250 ksps |
| Supply Voltage | +2.7V to +3.6V | +2.7V to +3.6V | +2.7V to +3.6V | +4.75V to +5.25V | +4.75V to +5.25V | +2.3V to +5.5V |
| Interface | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE | SPI/QSPI/MICROWIRE/DSP-compatible |
| Internal Reference | +2.5V | +2.5V | +2.5V | +2.5V | +4.096V | External only |
| Temperature Range | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Key Differentiators
- Lowest channel count with same 20-TSSOP footprint as the MAX1148 family (vs MAX1148BEUP+T)
- Lower supply current than 5V family variants (vs MAX1146BEUP+T)
- True-differential inputs in same pinout as AD7942BRUZ (vs AD7942BRUZ)
Design Notes
Estimated: at 3.6V supply and 0.6 mA active current, the MAX1147BEUP+T draws approximately 2.2 mW during continuous conversion. Use a 10 µF tantalum + 0.1 µF ceramic bypass on AVDD, and a separate 0.1 µF ceramic on DVDD, to prevent digital switching noise from coupling into the analog front end. A ferrite bead between AVDD and DVDD further reduces supply noise in 4-channel simultaneous-sampling applications. The SHDN-bar pin reduces supply current to < 1 µA in shutdown, allowing duty-cycled acquisitions for battery-powered designs.
Place the input RC low-pass network (typically 100 ohm and 10 nF) close to the AIN0–AIN3 pins to bandlimit input signals below the Nyquist frequency. Keep the analog input traces short and routed away from digital lines, particularly the SPI clock (SCLK), to minimize digital-to-analog crosstalk. The TSSOP-20 EP exposed pad (if applicable) should be soldered to a copper pour connected to AGND to provide thermal relief. Maintain a single-point ground star at AGND to prevent ground-loop noise from injecting into the ADC reference.
The MAX1147BEUP+T achieves ±1 LSB INL and DNL only when the input common-mode voltage remains within the supply rails and the input source impedance is below 1 kohm. Higher source impedances degrade the track/hold acquisition time, especially at 116 ksps. Use a low-impedance op-amp buffer (e.g., MAX4475) to drive the analog inputs in high-impedance sensor applications. For true-differential operation, bias the input common-mode to mid-supply (1.5V) using the internal +2.5V reference and a resistor divider, and use a differential driver such as the MAX4194 for instrumentation front-ends.
Do not exceed the absolute-maximum supply of 6V on AVDD/DVDD or apply analog inputs more than 300 mV outside the supply rails - both will damage the device. Do not leave the SHDN-bar pin floating; tie it high (to DVDD) when shutdown is not used. When using an external reference, the REF pin source current must be limited; place a 10 µF + 0.1 µF capacitor on REF to prevent oscillation. The MAX1147BEUP+T is a 3.3V part - using a 5V supply on the 3.3V variant is a common misapplication that can permanently damage the device.
Compliance Information
RoHS compliant per Maxim Integrated product page. Industrial temperature grade (-40C to +85C) only - not AEC-Q100 qualified for automotive use. Halogen-free status is not explicitly stated in the provided data and should be confirmed with the manufacturer for green-product requirements.
