ADC081S101CISD - 8-Bit 1MSPS ADC, 6-WSON | Texas Instruments
MPN: ADC081S101CISD ✗ סוף ייצורADC081S101CISD סקירה
An ADC (analog-to-digital converter) is a data-acquisition component that converts continuous analog signals into discrete digital codes for processing by microcontrollers, DSPs, or FPGAs. Successive-approximation register (SAR) ADCs such as the ADC081S101 are valued for their deterministic latency, low power draw, and small footprint, occupying the mid-tier of the converter hierarchy (SAR -> ADC -> data converter -> signal chain IC -> semiconductor).
Key features include an internal track-and-hold circuit, straight-binary serial output compatible with SPI, QSPI, MICROWIRE and many common DSP serial interfaces, and an extended industrial temperature range of -40 C to +85 C. The 6-WSON package footprint is one of the smallest available for this speed class.
The ADC081S101 is based on a SAR architecture with an internal track-and-hold, which samples the input on the rising edge of CS and completes it deterministically within the conversion cycle. The wide supply range lets the same part interface with both 3.3 V and 5 V microcontrollers without level shifters.
Typical applications include portable instrumentation, motor control feedback loops, sensor signal conditioning, optical-module monitoring, and consumer audio level metering. The SOT-23-class footprint also makes it suitable for space-constrained PCB designs.
When designing with this device, place a 0.1 uF decoupling capacitor as close as possible to the VDD pin and keep the analog input traces short and guarded. The device is now listed as obsolete on major distributors, so designers should consider active alternatives such as the ADC081S021 or ADC081S051.
This page synthesizes distributor stock status, drop-in alternatives in the same 6-WSON footprint, and design considerations not aggregated in any one distributor listing.
חלופות תחליף ישיר עבור ADC081S101CISD — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ADC081S101CISD (אותו גורם צורה וטביעת רגל) — שונים ב Package, Architecture, Resolution, Operating Temperature, RoHS Status.
ADC081S101CISD/NOPB
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADC101S101CISD
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADC121S101CISD
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADC081S051CISD
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADC081S021CISD
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADC081S051CISDX/NOPB
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADC081S101CISD דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 8 bit |
| Number of Channels | 1 |
| Sample Rate (max) | 1 Msps |
| Sample Rate Range | 500 ksps to 1 Msps |
| Architecture | SAR (Successive-Approximation Register) |
| Input Type | Single-ended |
| Supply Voltage (VDD) | 2.7 V to 5.25 V |
| Power Consumption at 3 V | 2.0 mW (typical) |
| Power Consumption at 5 V | 10.0 mW (typical) |
| Digital Interface | SPI / QSPI / MICROWIRE / DSP serial |
| Output Format | Straight binary |
| טמפרטורת פעולה | -40 C to +85 C |
| מארז | 6-WSON (2.2 x 2.5 mm) |
| Internal Track-and-Hold | Yes |
| סוג הרכבה | Surface Mount |
| סטטוס RoHS | Compliant (NOPB suffix; non-NOPB version may not be) |
תצורת פינים של ADC081S101CISD
| פין 1 | VDD — Power supply input (2.7 V to 5.25 V) |
| פין 2 | GND — Ground reference |
| פין 3 | VIN — Analog input voltage to be converted |
| פין 4 | DOUT — Serial data output (SPI MOSI) |
| פין 5 | SCLK — Serial clock input |
| פין 6 | CS — Chip-select (active low) |
יישומים טיפוסיים
ADC081S101CISD מתאים עבור 6 יישוםs: Portable Battery-Powered Instrumentation, Motor Control Current Sensing, Optical Module Monitoring, Sensor Signal Conditioning, Consumer Audio Level Metering, Industrial Process Control Feedback.
Portable Battery-Powered Instrumentation
The ADC081S101CISD is well suited to portable battery-powered instrumentation where its 2.0 mW typical power consumption at 3 V and 1 Msps throughput directly extend battery life. According to the TI datasheet, the device operates from a single 2.7 V to 5.25 V supply, allowing direct connection to single-cell Li-ion or two-AA battery stacks without level shifters. Placed close to the analog sensor with a 0.1 uF decoupling cap on VDD, the SAR architecture provides deterministic conversion latency that simplifies sync with a low-power MCU. Unlike higher-resolution converters, the 8-bit output and small 6-WSON footprint let designers add a measurement channel with negligible board area impact, while the same SPI bus can be shared with multiple ADCs via a CS line.
מומלץ
Motor Control Current Sensing
The ADC081S101CISD fits motor control current-sensing loops where a 1 Msps sample rate easily captures PWM-synchronized current transients at switching frequencies up to ~50 kHz. Its SAR architecture provides deterministic conversion latency so the MCU can place the sample window precisely when the shunt voltage is settled, avoiding PWM edge noise. The 8-bit resolution is sufficient for FOC and trapezoidal commutation loops where feedback precision of a few percent is adequate, and the small 6-WSON package fits inside tight inverter-board layouts. Placed next to a low-side shunt with a short, guarded trace and a small RC filter, the ADC keeps propagation delay under 1 us, leaving the MCU ample time to compute the next duty cycle.
מומלץ
Optical Module Monitoring
The ADC081S101CISD is commonly used in SFP/QSFP optical transceivers to monitor transmit bias current, received optical power, and module temperature. Its 1 Msps throughput is fast enough to capture AGC settling transients after a wavelength change, while the 8-bit dynamic range is well matched to the limited dynamic range of monitor photodiodes. The 6-WSON (2.2 x 2.5 mm) footprint fits inside the small PCB real-estate budget of a pluggable module, and the SPI interface allows the MCU to share the bus with the module's main controller. According to industry application notes, the SAR architecture's deterministic latency simplifies host-side synchronization on the 2-wire serial interface used by SFF-8472.
מומלץ
Sensor Signal Conditioning
The ADC081S101CISD suits general sensor-signal-conditioning modules for thermocouples, strain gauges, or potentiometer position readings. Its 1 Msps maximum throughput allows oversampling to extract extra effective bits from noisy sensor signals, and the 5 V supply option lets the same ADC connect directly to 5 V powered sensor bridges. The internal track-and-hold captures the input at the CS falling edge, which simplifies time-deterministic sampling synchronized to MCU events. Placed close to the sensor with a small input RC and a 0.1 uF VDD bypass, the SAR design adds minimal latency to the measurement loop, while the SPI bus lets the MCU poll multiple channels through chip-select lines.
מומלץ
Consumer Audio Level Metering
The ADC081S101CISD is a good fit for consumer audio VU-meter and peak-detector circuits where 8-bit resolution is more than adequate for level indication. Its 1 Msps sample rate easily exceeds the Nyquist requirement for the audio band, and the SAR architecture provides zero pipeline delay so the meter tracks the audio waveform without smearing transients. The single 2.7 V to 5.25 V supply option lets the same part work in both portable (3.3 V) and line-powered (5 V) audio products without redesign, and the tiny 6-WSON package fits behind an LED bar driver. According to TI's datasheet, the SPI-compatible output allows an inexpensive MCU to drive the meter ICs while sharing the bus with other peripherals.
מומלץ
Industrial Process Control Feedback
The ADC081S101CISD fits industrial process-control feedback loops such as valve position readout, pressure transducer digitization, or temperature monitoring where a small 8-bit ADC is sufficient for the loop's feedback resolution. Its extended -40 C to +85 C industrial temperature range qualifies it for cabinet-mounted or shop-floor equipment, and the SAR architecture's deterministic latency allows clean synchronization to a deterministic control loop. The wide 2.7 V to 5.25 V supply range tolerates loosely regulated industrial 24 V-to-5 V rails with no level-shifting, and the small 6-WSON footprint leaves room for robust input-protection networks. Placed near the sensor connector with input filtering and ESD protection, the device provides reliable feedback to a 4-20 mA loop controller or industrial MCU.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ADC081S101CISD — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ADC081S101CISD/NOPB | ADC101S101CISD | ADC121S101CISD | ADC081S051CISD | ADC081S021CISD | ADC081S051CISDX/NOPB |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 6-WSON (2.2x2.5) | 6-WSON (2.2x2.5) - same | 6-WSON (2.2x2.5) - same | 6-WSON (2.2x2.5) - same | 6-WSON (2.2x2.5) - same | 6-WSON (2.2x2.5) - same | 6-WSON (2.2x2.5) - same |
| Resolution | 8 bit | 8 bit | 10 bit | 12 bit | 8 bit | 8 bit | 8 bit |
| Max Sample Rate | 1 Msps | 1 Msps | 1 Msps | 1 Msps | 1 Msps | 500 ksps | 1 Msps |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Lifecycle Status | Obsolete | Obsolete (stock only) | Obsolete | Obsolete | Active | Active | Active |
| Interface | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE | SPI / QSPI / MICROWIRE |
מבדילים עיקריים
- Full 1 Msps throughput at 8-bit resolution (לעומתADC081S021CISD)
- Obsolete - prefer active family members (לעומתADC081S051CISD)
- Same package, same pinout - drop-in upgrade path to 12-bit resolution (לעומתADC121S101CISD)
הערות תכנון
Estimated: at 3.3 V supply and 1 Msps throughput the device burns approximately 2.5 mW; this rises to roughly 10 mW at 5 V supply. A 0.1 uF X7R ceramic decoupling capacitor placed within 3 mm of the VDD pin is essential to keep the high-speed SAR comparator supply clean; without it, conversion noise and code-edge jitter increase noticeably. Add a 10 uF bulk capacitor if the ADC shares its supply with high-current digital loads.
Keep analog input traces short and guarded; place a small RC low-pass filter (typically 100 ohm + 10 nF) at the VIN pin to limit broadband noise injected into the SAR sampling capacitor. The exposed die-pad on the bottom of the WSON package must be soldered to a continuous ground copper pour for thermal dissipation and to provide the low-impedance ground reference that the converter needs for accurate conversions.
Do not route the SPI clock line near the analog input trace - capacitive coupling between SCLK and VIN can corrupt the sample by tens of LSBs. A common mistake is forgetting the CS pull-up resistor; CS must return high between conversions or the device will hold DOUT active and waste power. Designers often overlook that the input voltage range is 0 V to VDD (not rail-to-rail with margin); input voltages within 50 mV of VDD will saturate and may damage the input ESD structure over time.
Estimated: the ADC's input bandwidth is approximately 10 MHz at -3 dB, so high-impedance sources above 5 MHz will be attenuated. Drive the input with a low-impedance buffer op-amp (e.g., an LMV321 or OPA369) if the source impedance is above 1 kohm, otherwise the SAR sampling capacitor's charge injection will degrade linearity. End-of-conversion is signaled by the falling edge of CS; ensure the MCU waits at least 16 SCLK cycles after CS goes low before reading valid data.
מידע על תאימות
Standard ADC081S101CISD has Pb-bearing finish and is NOT RoHS compliant. The /NOPB variant is RoHS compliant. Not AEC-Q100 qualified - not suitable for automotive safety applications. Conflict-minerals compliance per TI standard warranty.
