AD7993BRU-0REEL - 10-Bit 4-CH SAR ADC, I2C, 16-TSSOP
MPN: AD7993BRU-0REEL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.68 | $5.68 |
| 10 | $5.12 | $51.20 |
| 100 | $4.55 | $455.00 |
| 500 | $3.95 | $1,975.00 |
| 1,000 | $3.4 | $3,400.00 |
AD7993BRU-0REEL Overview
A SAR ADC is a class of analog-to-digital converter that uses a binary-search successive-approximation register to convert an input sample in N clock cycles for N bits of resolution. SAR ADCs occupy the middle ground between flash ADCs (fast, power-hungry, low resolution) and sigma-delta ADCs (high resolution, slow). They are the workhorse choice for general-purpose data acquisition, sensor readout, and microcontroller/microprocessor monitoring rails where both speed and resolution matter. The AD7993 specifically integrates a four-input multiplexer and track-and-hold amplifier, allowing four analog sources to share one ADC, reducing both BOM cost and PCB area.
Key features include four single-ended analog input channels, an I2C-compatible two-wire serial interface (standard, fast, and high-speed modes), 188 kSPS throughput, automatic sequencer operation, a hardware/software shutdown mode, and an automatic cycle interval timer. The wide 2.7 V to 5.5 V supply range permits direct interfacing to both 3.3 V microcontrollers and 5 V legacy systems. Low power consumption makes the part well-suited to battery-aware designs.
Architecturally, the AD7993 uses a charge-redistribution DAC core combined with an on-chip input track-and-hold rated for input bandwidths up to 11 MHz. The integrated input multiplexer supports both sequential and per-conversion channel selection. The I2C address is partially hardware-configurable, allowing up to three AD7993s on a single bus. The sequencer can also be set to cycle automatically across all four inputs.
Typical applications include system monitoring (board-level voltage, current, and temperature supervision), portable instrumentation, battery-powered sensor readout, multi-cell battery monitoring, and process-control front-ends. The TSSOP-16 footprint drops onto a small footprint that is easy to lay out next to a microcontroller. The wide supply range avoids the need for level shifters on most 5 V analog rails.
When designing with this part, ensure that the I2C bus pull-ups match the chosen speed mode (4.7 kohm for standard, lower for fast/high-speed) and that the reference voltage (VDD) is well decoupled with a 10 nF + 1 uF capacitor pair to limit conversion noise. The shutdown current is sub-microamp, so it is safe to leave the ADC off during long idle periods.
Drop-in alternatives for AD7993BRU-0REEL — 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 AD7993BRU-0REEL (same form factor and footprint) — differing in Resolution, RoHS Status, Interface, Number of Input Channels, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7993BRUZ-0REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7993BRU-0
✅ Drop-In📋 Reference alternative (not in catalog)
AD7994BRU-0REEL
✅ Drop-In✓ In Stock
$4.68 / Unit
View Datasheet →AD7997BRU-0REEL
✅ Drop-In📋 Reference alternative (not in catalog)
AD7495ARM-REEL
✅ Drop-In✓ In Stock
$5.18 / Unit
View Datasheet →AD7993BRU-0REEL Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices, Inc. |
| Part Number | AD7993BRU-0REEL |
| Description | 4-Channel, 10-bit, I2C-compatible successive-approximation ADC |
| Resolution | 10 bit |
| Number of Input Channels | 4 single-ended |
| Architecture | SAR (Successive Approximation) |
| Input Type | Single-Ended |
| Supply Voltage (VDD) | 2.7 V to 5.5 V |
| Conversion Time | 2 us (typical) |
| Throughput Rate | 188 kSPS |
| Interface | I2C-compatible (standard, fast, high-speed) |
| Track-and-Hold Input Bandwidth | 11 MHz |
| Package / Case | 16-TSSOP (RU-16) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +125C |
| Features | Four-channel MUX, sequencer, automatic cycle interval, shutdown mode |
| Reference | Uses VDD as reference |
| Packaging | Tape and Reel (REEL) |
| RoHS Status | Compliant (RU suffix indicates lead-free) |
| Resolution Category | Low-resolution (10-bit) general-purpose ADC |
AD7993BRU-0REEL Pin Configuration
| Pin 1 | AIN1 — Analog input channel 1 (single-ended) |
| Pin 2 | AIN2 — Analog input channel 2 (single-ended) |
| Pin 3 | AIN3 — Analog input channel 3 (single-ended) |
| Pin 4 | AIN4 — Analog input channel 4 (single-ended) |
| Pin 5 | REF — Voltage reference (typically tied to VDD) |
| Pin 6 | GND — Ground reference |
| Pin 7 | VDD — Power supply (2.7 V to 5.5 V) |
| Pin 8 | SDA — I2C serial data |
| Pin 9 | SCL — I2C serial clock |
| Pin 10 | AS — Address select - sets part of I2C address |
| Pin 11 | CONVST — Conversion start input (falling edge initiates conversion) |
| Pin 12 | DOUT — Conversion-done output flag (interrupt to host) |
| Pin 13 | NC — Not connected (per datasheet) |
| Pin 14 | NC — Not connected (per datasheet) |
| Pin 15 | SHUTDOWN — Active-high hardware shutdown input |
| Pin 16 | SLEEP/TEST — Sleep/test pin (tie to GND for normal operation per datasheet) |
Typical Applications
AD7993BRU-0REEL is suitable for 6 applications: System Voltage and Temperature Monitoring, Battery Cell and Pack Monitoring, Portable and Handheld Sensor Readout, Process Control and Industrial Front-Ends, LED Lighting Current and Color Monitoring, Sensor Hub and IoT Edge Nodes.
System Voltage and Temperature Monitoring
The AD7993BRU-0REEL is a strong fit for board-level system monitoring because its 4 single-ended inputs can each be assigned to one rails worth of supervision (e.g., 3V3, 1V8, 5V0, and a remote temperature-sensor diode output). At 188 kSPS throughput it can scan all four channels several thousand times per second, leaving margin for trending and alarm detection. The 10-bit resolution (1024 codes) yields ~3.5 mV precision on a 0-3.6 V supply, sufficient for under-voltage and over-voltage detection on most digital rails. According to the manufacturer datasheet, the I2C address pin allows up to three devices on one bus, scaling to 12 rails per controller.
Recommended
Battery Cell and Pack Monitoring
Battery-powered designs benefit from the AD7993BRU-0REEL's 2.7 V minimum supply, which matches single-cell Li-ion down to cutoff, and its four-channel multiplexer that can share one ADC across multiple cell taps via resistor dividers. The 10-bit resolution supports cell balancing decisions with ~5 mV precision at a 1-5 V span, while the sub-microamp shutdown current preserves sleep-mode runtime. According to the datasheet, the sequencer can be programmed to cycle through all four inputs automatically, freeing the host MCU for other tasks. The wide 2.7-5.5 V supply also tolerates USB-powered operation for charging carts.
Recommended
Portable and Handheld Sensor Readout
The AD7993BRU-0REEL's combination of small 16-TSSOP footprint, low power consumption, and integrated 4-channel multiplexer suits portable instrumentation such as handheld multimeters, environmental monitors, and wearable sensor pods. The 11 MHz track-and-hold input bandwidth accommodates fast sensor pulses without aliasing, while the I2C interface allows direct connection to low-pin-count microcontrollers like the ATmega or Cortex-M0+. According to the manufacturer datasheet, in shutdown mode the current drops to the nanoamp range, allowing the ADC to be left in-circuit permanently and powered on only for a brief conversion burst.
Recommended
Process Control and Industrial Front-Ends
Industrial control front-ends require reliable 4-20 mA loop digitization, thermocouple cold-junction compensation, and bridge-pressure sensor readout, all of which the AD7993BRU-0REEL can address through external signal conditioning plus its multiplexed ADC. The -40C to +125C operating range meets industrial temperature envelopes without derating. According to the datasheet, the 2.7 V to 5.5 V supply range permits direct operation from a regulated 5 V PLC backplane. The I2C address pin allows up to three devices to share a single industrial bus segment, enough for many field-IO modules.
Recommended
LED Lighting Current and Color Monitoring
RGB and tunable-white LED luminaires require multiple photodiode or sense-resistor feedback channels; the AD7993BRU-0REEL accepts four such inputs, allowing one ADC to monitor all primary color sense resistors sequentially. The 10-bit resolution comfortably resolves sense-resistor voltage drops of tens of millivolts for closed-loop constant-current regulation. The I2C interface lets a small microcontroller coordinate dimming and color-mixing loops without dedicating GPIO to ADC control. According to the manufacturer datasheet, the sequencer can cycle through the four LED channels automatically to update multiple PWM phases from a single host read.
Recommended
Sensor Hub and IoT Edge Nodes
IoT edge devices often need to digitize temperature, humidity, light, and motion sensors with a low-power ADC front end. The AD7993BRU-0REEL's four single-ended inputs map naturally to the four most common analog sensors, and its I2C fast-mode lets the host MCU run other I2C peripherals on the same bus. According to the manufacturer datasheet, the cyclic sequencer can wake the MCU on completion, supporting interrupt-driven events for energy-efficient edges. The shutdown pin allows the ADC to be duty-cycled, achieving average power in the single-digit microwatt range.
Recommended
Recommended Products Summary
Engineering reference data for AD7993BRU-0REEL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7993BRUZ-0REEL | AD7993BRU-0 | AD7994BRU-0REEL | AD7997BRU-0REEL |
|---|---|---|---|---|---|
| Package | 16-TSSOP | 16-TSSOP (lead-free) - same | 16-TSSOP - same | 16-TSSOP - same | 16-TSSOP - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 10 bit | 10 bit | 10 bit | 12 bit | 10 bit |
| Input Channels | 4 single-ended | 4 single-ended | 4 single-ended | 4 single-ended | 8 single-ended |
| Throughput Rate | 188 kSPS | 188 kSPS | 188 kSPS | 188 kSPS | 188 kSPS |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Interface | I2C (2-wire) | I2C (2-wire) | I2C (2-wire) | I2C (2-wire) | I2C (2-wire) |
| Conversion Time (typical) | 2 us | 2 us | 2 us | 2 us | 2 us |
| Operating Temperature | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C | -40C to +125C |
Key Differentiators
- Pin-compatible 12-bit upgrade path on the same PCB footprint (vs AD7994BRU-0REEL)
- Wider channel count than same-package ADC family members when needed (vs AD7997BRU-0REEL)
- Integrated 4-channel multiplexer avoids external analog switch parts (vs Discrete mux + external 10-bit ADC)
Design Notes
Decouple the VDD pin with a 10 nF ceramic capacitor placed within 5 mm of the device, in parallel with a bulk 1 uF to 10 uF. The AD7993BRU-0REEL uses VDD as the ADC reference, so any noise or droop on the supply directly couples into the conversion result. For best noise performance, use a dedicated low-noise LDO such as the ADP150 to feed the AD7993 instead of sharing a noisy digital rail. Estimated: at 188 kSPS the ADC draws well under 1 mW, so a small SMD ferrite plus 10 nF + 1 uF LC filter is sufficient for noise isolation.
Route the four AIN traces in parallel and isolate them from digital and switching signals. The TSSOP-16 has pins 1-4 dedicated to AIN1-AIN4, so route each input on the top layer with a continuous ground plane on the next layer. Keep trace lengths matched if the application uses the sample-and-hold's full 11 MHz bandwidth. Place the I2C pull-up resistors near the AD7993 SDA/SCL pins, not at the host end, to keep the bus rise time controlled.
Do not feed a signal beyond VDD into any AIN pin, even when the device is in shutdown; the input ESD diodes can conduct and corrupt the conversion. Always add a series input resistor (1 kohm or greater) if the source can overshoot. Also note that the AS (address select) pin must be tied either to GND or VDD, not left floating, or the I2C address becomes unstable. The SHDN pin must be driven to a known logic state at power-up to avoid unwanted shutdown modes.
When using the cyclic sequencer, allow the track-and-hold amplifier to settle before each conversion. The datasheet specifies 2 us as the minimum conversion time; running at less (some clock-stretching tricks fail) leads to gain and offset errors. If signals have high source impedance (>1 kohm), increase the conversion time or buffer the inputs with a low-offset op-amp such as the AD8628 to preserve full 10-bit accuracy. Estimated: each LSB of conversion noise corresponds to roughly 0.5 mV at the input when VDD = 2.7 V.
Compliance Information
The BRUZ suffix variants are lead-free RoHS compliant. The BRU/-REEL part family does not carry AEC-Q100 automotive qualification; for automotive-grade ADC needs, contact Analog Devices about the AD7993-1/-2 automotive-qualified versions. Conflict-minerals compliance per Analog Devices policy.
