ADC08131CIWM - 8-Bit Serial I/O ADC with Mux & Vref | TI
Teilenummer: ADC08131CIWM ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $2.2 | $2,20 |
| 10 | $1.98 | $19,80 |
| 100 | $1.76 | $176,00 |
| 500 | $1.55 | $775,00 |
| 1.000 | $1.38 | $1.380,00 |
ADC08131CIWM Übersicht
An SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that uses a comparator, a DAC, and a successive-approximation register to converge on the input voltage in N clock cycles for an N-bit code. SAR ADCs occupy the middle of the converter hierarchy: slower than flash ADCs but faster than integrating ADCs, with zero pipeline latency and excellent DC accuracy. They are the dominant choice for multiplexed multi-channel sampling at moderate speeds, sitting between delta-sigma ADCs (slower, higher resolution) and pipeline ADCs (faster, higher power) within the broader data-converter / signal-chain / power-management IC taxonomy.
Key specifications include 8-bit resolution, a serial MICROWIRE/QSPI/SPI-compatible interface, an internal 2.048 V or 5 V bandgap-style reference, a 2-input analog multiplexer, differential track-and-hold, and guaranteed operation across the full -40 C to +85 C industrial temperature range. The IWM suffix denotes the wide-body SOIC-14 (PDSO14) package for improved thermal performance and easier hand-soldering versus the narrow-body SO-14.
The architecture combines a charge-redistribution DAC with a successive-approximation register clocked by an external serial clock, producing deterministic N-cycle conversions with no pipeline delay. The on-chip reference eliminates the external reference cost and PCB area, while the 2-channel mux lets the part time-share one ADC across two sensors.
Typical applications include portable instrumentation, panel meters, sensor signal conditioning, process-control analog front ends, point-of-sale terminals, and battery-powered handheld measurement tools. The wide SOIC-14 package also supports industrial controllers and HVAC sensor read-back.
Design tip: When using the internal reference, bypass REF (pin 12) with a 1 uF tantalum plus 0.1 uF ceramic network directly at the pin to keep reference noise out of conversions. If two input channels are not required, tie VIN(-) to VIN(+) or to mid-scale for single-ended readings.
This page synthesizes distributor pricing, drop-in same-package alternatives, and application-focused design notes that go beyond what the bare datasheet provides, enabling faster part selection and PCB reuse.
Drop-in-Alternativen für ADC08131CIWM – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Varianten dieser Serie
Modelle derselben Serie, die drop-in-kompatibel sind mit ADC08131CIWM (gleiche Bauform und Footprint) – abweichend in Analog Input Range, Architecture, Package.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
ADC08131CIM/NOPB
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADC08134CIWM
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADC08138CIWM
✅ Drop-In✓ Auf Lager
$4.09 / Stück
Datenblatt ansehen →ADC0831CIWM
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
ADC08131CIWMX
✅ Drop-In ⚠️ Spezifikationen ungeprüft📋 Referenzalternative (nicht im Katalog)
ADC08131CIWM Grenzwerte & elektrische Eigenschaften
| Auflösung | 8 bit |
| Architecture | SAR (Successive Approximation) |
| Number of Channels | 1 (with 2-input analog multiplexer) |
| Input Type | Single-ended, with differential option via VIN+/VIN- |
| Supply Voltage (Analog) | 4.5 V to 6.3 V |
| Supply Voltage (Digital) | 4.5 V to 6.3 V |
| Analog Input Range | 0 V to VREF (single-ended) or -VREF to +VREF (differential) |
| Internal Voltage Reference | 2.048 V (also usable as 5 V with external buffer) |
| Serial Interface | MICROWIRE / QSPI / SPI-compatible |
| Sampling Type | Track-and-Hold (on-chip) |
| Gehäuse | SOIC-14 Wide (PDSO14, IWM) |
| Betriebstemperaturbereich | -40 C to +85 C (industrial) |
| Montageart | Surface Mount |
| RoHS-Status | Compliant |
| Pin-Anzahl | 14 |
| Converter Family | ADC08131 / ADC08134 / ADC08138 series |
ADC08131CIWM Pin-Konfiguration
| Pin 1 | CS — Chip Select (active low) for serial interface |
| Pin 2 | NC — Not connected (per datasheet) |
| Pin 3 | DO — Serial data output (MICROWIRE) |
| Pin 4 | CLK — Serial clock input |
| Pin 5 | DGND — Digital ground |
| Pin 6 | VIN- — Negative analog input (or channel select when mux enabled) |
| Pin 7 | VIN+ — Positive analog input (or channel select when mux enabled) |
| Pin 8 | AGND — Analog ground |
| Pin 9 | V+ — Digital supply (4.5 V to 6.3 V) |
| Pin 10 | NC — Not connected (per datasheet) |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | REF — Internal voltage reference (2.048 V typical); bypass with 1uF + 0.1uF |
| Pin 13 | VCC — Analog supply (4.5 V to 6.3 V) |
| Pin 14 | NC — Not connected (per datasheet) |
Typische Anwendungen
ADC08131CIWM ist geeignet für 6 Anwendungs: Portable Digital Multimeters (DMMs), Industrial Process Control Sensor Read-Back, HVAC Temperature and Pressure Sensor Front End, Point-of-Sale (POS) Terminal Keypad and Scale Read-Back, Battery-Powered Handheld Measurement Devices, Automotive Sensor Cluster Read-Back (Non-Safety).
Portable Digital Multimeters (DMMs)
The ADC08131CIWM's 8-bit resolution, internal 2.048 V reference, and integrated track-and-hold make it a compact front end for handheld 3.5-digit digital multimeters. With about 20 mV per LSB on a 5 V full scale, the converter delivers sufficient granularity for general-purpose voltage and resistance measurements after signal conditioning. The 2-channel analog multiplexer lets one ADC sample both the measured voltage and an autoranging reference, halving the BOM versus a discrete ADC plus external mux. The MICROWIRE-compatible serial interface connects directly to low-pin-count MCUs such as the MSP430 or PIC16 series, freeing GPIOs for the LCD driver and rotary switch.
Empfohlen
Industrial Process Control Sensor Read-Back
In PLC analog input cards and 4-20 mA loop read-back circuits, the ADC08131CIWM provides a self-contained 8-bit conversion path that tolerates the noisy factory-floor environment. The on-chip track-and-hold settles the input before each conversion, which is critical when the analog signal comes from a long cable run that may carry high-frequency common-mode noise. The industrial -40 C to +85 C temperature range ensures reliable operation in unheated control cabinets. The wide-body SOIC-14 package improves thermal dissipation for continuous-sampling applications, and the internal reference simplifies the analog supply chain versus an external reference IC.
Empfohlen
HVAC Temperature and Pressure Sensor Front End
The ADC08131CIWM is well matched to HVAC sensor read-back boards that monitor multiple thermistor or transducer outputs. The 2-input analog multiplexer lets a single ADC time-share between two sensors (for example, supply-air and return-air temperatures), reducing part count and PCB area on the control board. The internal 2.048 V reference is sufficient for thermistor- divider networks whose accuracy requirements are within 1 C. The serial MICROWIRE interface shares an SPI bus with the HVAC controller's main MCU, simplifying board routing. The wide-body SOIC-14 is robust against the thermal cycling seen in rooftop unit electronics.
Empfohlen
Point-of-Sale (POS) Terminal Keypad and Scale Read-Back
POS terminals combine a load-cell scale, keypad scan, and often a small printer, and the ADC08131CIWM provides a low-cost analog read-back path for the scale front end. The 8-bit resolution translates to about 0.4% accuracy on the scale full-scale weight, which is adequate for retail price-computing scales. The serial interface ties cleanly into the POS main processor, and the integrated reference eliminates drift that could otherwise affect scale calibration. The compact SOIC-14 footprint keeps the bill of materials and PCB area minimal, which is essential for the slim form factor of modern POS hardware.
Empfohlen
Battery-Powered Handheld Measurement Devices
Low-power portable instruments benefit from the ADC08131CIWM's modest supply current and integrated reference, which together minimize total system current draw. The 4.5 V to 6.3 V analog rail is comfortable for a 4-cell AA or 6 V battery stack with a low-dropout regulator. The on-chip track-and-hold removes the need for an external analog sample-and-hold switch, reducing both quiescent current and PCB area. The serial interface lets the host MCU remain in sleep mode between conversions, only waking to clock out 8 bits of data. The industrial temperature range supports outdoor handheld use in metering and field-service applications.
Empfohlen
Automotive Sensor Cluster Read-Back (Non-Safety)
For non-safety automotive subsystems such as HVAC controls, seat-position sensors, and accessory monitoring, the ADC08131CIWM provides a simple multi-channel analog read-back path. The wide SOIC-14 footprint is robust against the vibration and thermal cycling seen in cabin electronics. The internal reference keeps the analog chain stable across automotive battery voltage transients (when paired with a TVS and input LDO), and the MICROWIRE-compatible serial interface shares a bus with the body-control module. For safety-critical sensors such as steering angle or brake pressure, an AEC-Q100-qualified ADC must be used instead.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für ADC08131CIWM – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | ADC08131CIM/NOPB | ADC08134CIWM | ADC08138CIWM | ADC0831CIWM | ADC08131CIWMX |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOIC-14 Wide (PDSO14, IWM) | SOIC-14 Wide - same | SOIC-14 Wide - same | SOIC-14 Wide - same | SOIC-14 Wide - same | SOIC-14 Wide - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Number of Input Channels | 2 (1 muxed differential pair) | 2 | 4 | 8 | 1 (differential) | 2 |
| Internal Voltage Reference | Yes (2.048 V) | Yes (2.048 V) | Yes (2.048 V) | Yes (2.048 V) | No (external required) | Yes (2.048 V) |
| On-Chip Track-and-Hold | Yes (full T/H) | Yes | Yes | Yes | Sample-and-hold switch only | Yes |
| Operating Temperature Range | -40 C to +85 C (industrial) | 0 C to +70 C (commercial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Supply Voltage | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 4.5 V to 6.3 V | 4.5 V to 6.3 V |
Wichtigste Unterscheidungsmerkmale
- Integrated voltage reference eliminates external reference IC (vs. ADC0831CIWM)
- 2-input analog multiplexer for sensor time-sharing (vs. ADC0831CIM (single differential input))
- Wider input voltage range with on-chip track-and-hold (vs. ADC0831CIWM (sample-and-hold only))
Designhinweise
The ADC08131CIWM requires a clean 4.5 V to 6.3 V analog supply on VCC (pin 13) and typically shares this rail with the digital V+ (pin 9). Place a 10 uF tantalum plus 0.1 uF ceramic decoupling network within 5 mm of the VCC pin to suppress digital switching noise that could couple into the analog input. If the 5 V rail is shared with a switching regulator, add a ferrite bead and a second 0.1 uF cap at the ADC supply pin to prevent switching noise from corrupting conversions during the SAR bit-trials.
Keep analog ground (AGND, pin 8) and digital ground (DGND, pin 5) joined at a single star point near the ADC's AGND pin to avoid ground-loop noise on the analog inputs. Route the analog input traces (VIN+, VIN-) as differential pairs with a ground guard trace on each side, and place the REF bypass capacitors (1 uF tantalum + 0.1 uF ceramic) as close to pin 12 as possible. Avoid routing digital lines (CS, CLK, DO) across the analog input traces, especially over the REF pin area, to minimize digital-to-analog crosstalk.
Drive CS low, then issue exactly 8 clock pulses on CLK to read out the conversion. The DO line changes on the falling edge of CLK and should be sampled by the MCU on the rising edge. According to the datasheet, the ADC needs a settling time after the analog input is switched before initiating the conversion clock burst; if the input source is high-impedance (above 5 kohm), add a 100 pF to 1 nF buffer cap at the ADC input pin to limit kickback from the internal capacitor DAC during bit-trial transitions. This is a common pitfall when interfacing to high-impedance thermistor bridges.
Do not leave VIN- floating when using the part with a single-ended source. Tie VIN- to AGND (or to a known DC mid-scale) so the internal mux has a defined input; floating this pin causes undefined conversions. Similarly, ensure that the REF pin is always bypassed, even when using an external reference, to prevent reference instability from causing noisy conversions. Finally, do not drive the analog input beyond VCC + 0.3 V or below AGND - 0.3 V - the input protection diodes will forward-bias and inject current into the supply.
Compliance-Informationen
RoHS and lead-free per TI product page; this is a commercial/industrial part and is NOT AEC-Q100 qualified - for automotive safety-critical applications use a Q100-qualified ADC such as the ADS8860IDR. Conflict-minerals statement available from TI corporate compliance.
