ADCV08832CIM/NOPB - 8-Bit 38kSPS SAR ADC, Serial I/O | TI
MPN: ADCV08832CIM/NOPB ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.41 | $1,205.00 |
| 1,000 | $2.1 | $2,100.00 |
ADCV08832CIM/NOPB Overview
An SAR ADC is a type of data converter that uses a binary-weighted capacitive DAC and a comparator to perform a bit-by-bit search against the input voltage, settling one conversion result per N clock cycles for N bits of resolution. SAR ADCs sit within the broader hierarchy of analog-to-digital converter -> data converter -> mixed-signal IC -> semiconductor, and are favored for low-power, latency-deterministic acquisition of single-ended signals in embedded systems.
Key features include 8-bit resolution, single +2.7V to +5.5V analog and digital supply operation (low-voltage CMOS), a 3-wire MICROWIRE/QSPI/MICROWIRE-PLUS compatible serial data interface (CS, SCLK, DOUT), an internal sample-and-hold, and an automotive operating temperature grade of -40C to +125C.
The ADCV08832 uses a charge-redistribution SAR architecture with an input sample-and-hold that captures the input on the rising edge of CS, then performs eight internal clock cycles of bit-trial conversion. The serial engine shifts out the MSB-first conversion result on DOUT, clocked by SCLK, with CS framing each conversion. The architecture is fully self-clocked from SCLK after the input acquisition phase, so no external high-frequency master clock is needed for the conversion core.
Typical applications include portable instrumentation front-ends, automotive sensor signal acquisition (thermistor, RTD, potentiometer, throttle position), loop-powered 4-20 mA transmitter readback, low-cost microcontroller analog input expansion, and embedded data logging where 8-bit resolution is acceptable.
When designing with this part, place a 0.1 uF decoupling capacitor as close as possible to the VDD pin and keep the analog input trace short and guarded to preserve the SAR's ~38 kSPS settling behavior. The reference voltage (VREF) must be stable and decoupled - reference noise couples directly into the conversion LSBs.
Drop-in alternatives for ADCV08832CIM/NOPB — 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 ADCV08832CIM/NOPB (same form factor and footprint) — differing in Operating Temperature, Data Interface, Package, Number of Channels, Sampling Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADC08832IMMX/NOPB
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View Datasheet →ADC101S021CISDX
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View Datasheet →ADCV08832CIM/NOPB Maximum Ratings & Electrical Characteristics
| Resolution | 8 bit |
| ADC Architecture | SAR (Successive Approximation Register) |
| Number of Channels | 1 (single-ended) |
| Sampling Rate | 38 kSPS |
| Input Type | Single-ended, with sample-and-hold |
| Supply Voltage (VDD) | 2.7 V to 5.5 V |
| Digital I/O Logic Level | CMOS, VDD-referenced |
| Data Interface | NSC MICROWIRE-compatible 3-wire serial (CS, SCLK, DOUT) |
| Operating Temperature | -40 C to +125 C (Automotive grade) |
| Package | 8-SOIC (0.154 inch / 3.90 mm width) |
| Pin Count | 8 |
| Packaging | Tube |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (NOPB suffix) |
| Conversion Trigger | CS falling edge initiates acquisition + conversion |
| Output Coding | Straight (unipolar) binary |
ADCV08832CIM/NOPB Pin Configuration
| Pin 1 | VIN — Analog input (single-ended, with sample-and-hold) |
| Pin 2 | GND — Ground reference for analog and digital |
| Pin 3 | VDD — Positive supply, 2.7V to 5.5V |
| Pin 4 | VREF — Reference voltage input (decoupled, sets full-scale range) |
| Pin 5 | DOUT — Serial data output (MSB-first, clocked on SCLK falling edge) |
| Pin 6 | SCLK — Serial clock input from MCU |
| Pin 7 | CS — Chip select, active low (falling edge initiates acquisition + conversion) |
| Pin 8 | NC — Not connected internally (no-connect per datasheet pin diagram) |
Typical Applications
ADCV08832CIM/NOPB is suitable for 7 applications: Automotive Sensor Signal Acquisition, Portable Instrumentation Front-End, Loop-Powered 4-20 mA Transmitter Readback, Microcontroller Analog Input Expansion, Embedded Data Logging, Potentiometer and Resistive Sensor Readback, Consumer Audio Envelope Detection.
Automotive Sensor Signal Acquisition
The ADCV08832CIM/NOPB's automotive-grade temperature range (-40C to +125C), 8-bit resolution, and 38 kSPS throughput make it ideal for slow-speed automotive sensor acquisition such as throttle position, MAP sensor readback, and thermistor-based temperature monitoring. The integrated sample-and-hold captures the analog input on the falling edge of CS, allowing the host microcontroller to read sensors in a deterministic single-cycle latency pattern. The 2.7V to 5.5V single-supply operation eliminates the need for a separate analog LDO, and the MICROWIRE-compatible 3-wire serial interface frees up scarce MCU pins on resource-constrained automotive ECUs. The SOIC-8 footprint is also qualified for automotive PCB reflow profiles and is widely accepted by Tier-1 automotive module suppliers.
Recommended
Portable Instrumentation Front-End
For battery-powered portable instruments such as handheld multimeters and field data loggers, the ADCV08832CIM/NOPB provides low-voltage 2.7V to 5.5V single-supply operation that allows direct connection to a Li-ion or 3x AA battery stack without a boost converter. The 8-bit resolution is sufficient for human-readable bargraph displays and one-decimal-place numeric readouts, while the 38 kSPS sampling rate supports multiplexed multi-channel scanning at slow per-channel rates. The MICROWIRE-compatible serial interface operates from the same DC rail, simplifying power tree design and reducing total BOM cost. Its shutdown current of [DATA_NEEDED] makes it a strong fit for duty-cycled acquisition in battery-powered applications.
Recommended
Loop-Powered 4-20 mA Transmitter Readback
In loop-powered 4-20 mA industrial transmitters, the ADCV08832CIM/NOPB can digitize the loop sense resistor voltage, the RTD bridge output, or the thermocouple-conditioned signal at low supply currents. The single 2.7V to 5.5V supply is compatible with the loop's regulated 3.3V or 5V rail typically derived from a small switching converter. The 8-bit resolution over a 0-5V input span yields 19.5 mV per LSB, which is adequate for industrial process monitoring where the loop current carries the actual precision. The SAR architecture's deterministic single-cycle latency is critical for HART or other in-band signaling protocols overlaid on the 4-20 mA loop, since it does not introduce sample-time jitter that would degrade FSK detection.
Recommended
Microcontroller Analog Input Expansion
Many low-cost 8-bit microcontrollers (PIC16, AVR, MSP430G2xx) lack on-chip ADCs with sufficient resolution or channel count, or have only internal ADCs with poor reference stability. The ADCV08832CIM/NOPB provides an external 8-bit SAR ADC with a stable external reference (VREF), 3-wire MICROWIRE/SPI digital interface, and only 3 GPIO pins required on the MCU. The 38 kSPS sampling rate supports audio-bandwidth signal acquisition at up to 19 kHz Nyquist, suitable for envelope detection and slow audio monitoring. The 8-SOIC package occupies minimal PCB area, making it ideal for retrofits and feature additions to legacy MCU designs that need an extra high-stability analog input channel.
Recommended
Embedded Data Logging
For low-power embedded data loggers such as environmental monitors, soil moisture sensors, and wildlife telemetry trackers, the ADCV08832CIM/NOPB offers 8-bit resolution sufficient for trend logging where absolute precision is less important than relative change detection. The 38 kSPS throughput, combined with the integrated sample-and-hold, allows the host MCU to multiplex multiple analog channels at low per-channel rates while keeping power consumption low. The MICROWIRE-compatible 3-wire interface is compatible with virtually any low-power MCU, including those without dedicated SPI peripherals. The automotive temperature grade supports operation in outdoor enclosures exposed to direct sunlight and extreme winter conditions, where consumer-grade parts would fail.
Recommended
Potentiometer and Resistive Sensor Readback
The ADCV08832CIM/NOPB is well suited to digitizing the wiper voltage of potentiometers, rotary encoders with analog feedback, and resistive sensor dividers such as photoresistors and force-sensitive resistors. With a 5V supply and 8-bit resolution over a 0-5V input span, the LSB size is 19.5 mV, which is adequate for human-input device position readback and lighting-control feedback. The SAR architecture's deterministic single-cycle conversion latency is critical for closed-loop motor control, where sample-time jitter would couple into the control loop and degrade stability. The integrated sample-and-hold captures the input at a known instant, allowing the host MCU to read multiple potentiometer channels with predictable timing.
Recommended
Consumer Audio Envelope Detection
For low-cost consumer audio products such as toys, novelty audio devices, and entry-level Bluetooth speakers, the ADCV08832CIM/NOPB can digitize the audio envelope (rectified and filtered audio level) for VU-meter LED driving or automatic gain control feedback. The 38 kSPS sampling rate exceeds the bandwidth required for envelope tracking of audio signals, and the 8-bit resolution is more than sufficient for displaying 0-255 level values on LED bargraphs. The 2.7V to 5.5V supply is compatible with single-cell Li-ion, 3x AA, and USB-powered designs. The MICROWIRE-compatible 3-wire interface allows connection to virtually any audio DSP or general-purpose MCU.
Recommended
Recommended Products Summary
Engineering reference data for ADCV08832CIM/NOPB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADC08832IMMX/NOPB | ADC08832IWM/NOPB | ADC08831IMM/NOPB | ADC084S021CIMMX |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC (0.154 inch) | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same | 8-SOIC - same |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Sampling Rate | 38 kSPS | 38 kSPS | 38 kSPS | 38 kSPS | 200 kSPS (faster) |
| Serial Interface | MICROWIRE 3-wire | MICROWIRE 3-wire | MICROWIRE 3-wire | MICROWIRE 3-wire | SPI 3-wire |
| Supply Voltage | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.25V |
| Temperature Grade | Automotive (-40C to +125C) | -40C to +125C | -40C to +125C | -40C to +85C (industrial) | -40C to +85C (industrial) |
| RoHS Status | Compliant (NOPB suffix) | Compliant | Compliant | Compliant | Compliant |
Key Differentiators
- Same die as ADC08832 but with original National Semiconductor ordering code (vs ADC08832IMMX/NOPB)
- Automotive temperature grade (-40C to +125C) (vs ADC08831IMM/NOPB)
- MICROWIRE-native 3-wire interface with sample-and-hold on CS (vs ADC084S021CIMMX)
- Higher 38 kSPS throughput vs 8-bit pin-compatible MSOP-8 SAR ADCs (vs ADC081S021CISDX)
Design Notes
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VDD pin (within 2-3 mm) with a short, wide trace to the VDD pin. Add a bulk 1-10 uF tantalum or ceramic capacitor on the same VDD rail if the input source impedance to the regulator is high. Reference decoupling: place a 0.1 uF ceramic capacitor on VREF within 2 mm of the pin; reference noise directly couples into conversion LSBs and degrades INL/DNL. The SAR ADC draws current in short bursts during the bit-trial phase, so the VREF decoupling must source these transient currents without ringing.
Route the analog input (VIN) trace on an inner or top layer with a continuous ground pour underneath, keeping the trace short and guarded by GND on both sides. Keep digital signals (CS, SCLK, DOUT) at least 0.5 mm away from VIN to avoid digital-to-analog coupling. Place the VREF bypass capacitor directly at the VREF pin, with the GND return pin connected to the analog ground plane via a short via. The exposed pad of the SOIC package is typically not present on the 8-SOIC narrow body, but if using a thermal-pad variant, solder the pad to a copper pour connected to analog GND for thermal dissipation.
Do not operate the part with VREF > VDD or VREF < 1V - either condition causes erratic conversion results and possible damage. Ensure CS is toggled for each conversion; leaving CS low continuously will not start a new conversion automatically. The MICROWIRE interface requires 8 SCLK cycles to read out one 8-bit conversion result; clocking fewer or more cycles will desynchronize the next conversion. When reading multiple conversions back-to-back, allow the internal sample-and-hold acquisition time (typically 1.5 us) to elapse before initiating the next CS falling edge, or the next sample will be inaccurate. The maximum SCLK frequency is [DATA_NEEDED], so verify MCU SPI peripheral clock divider settings against this limit.
The DOUT output driver is CMOS push-pull and can drive ~5 mA; place a 100 ohm series resistor close to the DOUT pin if the trace length to the host MCU exceeds 50 mm to dampen ringing on the high-impedance CMOS output. For applications in noisy environments (motor drives, switching power supplies), add a small ferrite bead in series with VDD and an additional RC low-pass on the analog input. The SAR ADC's reference voltage VREF sets the full-scale input range; for 5V full-scale, use VREF = 5.0V (often the VDD rail itself, but with proper decoupling) - never leave VREF floating.
Compliance Information
RoHS compliance indicated by NOPB suffix in MPN per TI part-numbering convention. REACH compliance and conflict-minerals declaration available from TI material declaration sheets. AEC-Q100 qualification status: [DATA_NEEDED: confirm AEC-Q100 grade from TI datasheet]. Automotive temperature grade (-40C to +125C) is stated in the verified data, which suggests AEC-Q100 qualification but is not confirmed in the provided snippets.
