AD7798BRUZ - 16-Bit Sigma-Delta ADC, 3-Channel | Analog Devices
MPN: AD7798BRUZ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.5 | $6.50 |
| 10 | $5.9 | $59.00 |
| 100 | $5.2 | $520.00 |
| 500 | $4.8 | $2,400.00 |
| 1,000 | $4.5 | $4,500.00 |
Drop-in alternatives for AD7798BRUZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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Request AlternativesAD7798BRUZ Maximum Ratings & Electrical Characteristics
| Resolution | 16 Bit |
| Number of Input Channels | 3 Differential |
| Input Type | Differential |
| Data Interface | SPI |
| Sampling Rate | 470 SPS |
| Supply Voltage | 2.7 V to 5.25 V |
| Operating Temperature | -40°C to +105°C |
| Package | 16-TSSOP |
| Mounting Type | Surface Mount |
| RMS Noise | 1.5 µV (at 4.17 Hz) |
| Supply Current | 400 µA typ |
| Power-Down Current | 1 µA max |
| On-Chip In-Amp Gain | 1 to 128 |
| Reference Type | Internal/External |
| RoHS Status | Compliant |
AD7798BRUZ Pin Configuration
| Pin 1 | SCLK — Serial clock input |
| Pin 2 | DIN — Serial data input |
| Pin 3 | DOUT/RDY — Serial data output / ready |
| Pin 4 | CS — Chip select (active low) |
| Pin 5 | GND — Ground |
| Pin 6 | AVDD — Analog supply |
| Pin 7 | REFIN(+) — Positive reference input |
| Pin 8 | REFIN(-) — Negative reference input |
| Pin 9 | AIN1(+) — Analog input 1 positive |
| Pin 10 | AIN1(-) — Analog input 1 negative |
| Pin 11 | AIN2(+) — Analog input 2 positive |
| Pin 12 | AIN2(-) — Analog input 2 negative |
| Pin 13 | AIN3(+) — Analog input 3 positive |
| Pin 14 | AIN3(-) — Analog input 3 negative |
| Pin 15 | DVDD — Digital supply |
| Pin 16 | PWRDN — Power-down input |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
AD7798BRUZ is suitable for 6 applications: Temperature Measurement, Pressure and Strain Gauge Sensing, Battery Monitoring, Weigh Scales, Industrial Process Control, Portable Instrumentation.
Temperature Measurement
The AD7798BRUZ is ideal for temperature measurement using RTDs and thermocouples. Its on-chip in-amp with gain up to 128 amplifies small sensor signals, and the 16-bit resolution with low RMS noise (1.5 µV) ensures accurate temperature readings. The device's low power consumption (400 µA) is beneficial for portable temperature loggers. The SPI interface allows easy integration with microcontrollers for data processing and display.
Recommended
Pressure and Strain Gauge Sensing
In pressure and strain gauge applications, the AD7798BRUZ provides high-resolution conversion of bridge sensor outputs. The integrated low-side power switch can excite the bridge, and the in-amp gain up to 128 amplifies the small differential signal. The device's low noise and high accuracy are critical for precise pressure measurements. The SPI interface simplifies connection to industrial controllers, and the wide supply voltage range accommodates various system rails.
Recommended
Battery Monitoring
The AD7798BRUZ is suitable for battery monitoring systems where low power and high accuracy are essential. It can measure battery voltage and current with high resolution, and its low supply current (400 µA) minimizes drain on the battery. The power-down mode (1 µA) further extends battery life in idle periods. The SPI interface allows the host controller to read measurements periodically, and the internal reference simplifies the design.
Recommended
Weigh Scales
In weigh scale applications, the AD7798BRUZ provides the high resolution and low noise required for accurate weight measurement. The on-chip in-amp can interface directly with load cells, and the low-side power switch can drive the bridge excitation. The device's 16-bit resolution and programmable data rate allow trade-offs between speed and noise. The SPI interface enables calibration and data readout by a microcontroller.
Recommended
Industrial Process Control
The AD7798BRUZ is well-suited for industrial process control systems that require precise analog-to-digital conversion of sensor signals. Its wide operating temperature range (-40°C to +105°C) and robust SPI interface make it reliable in harsh environments. The device's low power consumption and high accuracy are beneficial for distributed control nodes. The internal reference and clock reduce external component count, simplifying board design.
Recommended
Portable Instrumentation
For portable instrumentation, the AD7798BRUZ offers a combination of low power, high resolution, and small package size (16-TSSOP). Its 400 µA supply current and 1 µA power-down mode extend battery life, while the 16-bit resolution ensures accurate measurements. The SPI interface allows connection to low-power microcontrollers, and the internal reference reduces external components, saving board space.
Recommended
Recommended Products Summary
Engineering reference data for AD7798BRUZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7798BRUZ-REEL | AD7799BRUZ | AD7792BRUZ | ADS1112IDRCT | ADS1112DRCR |
|---|---|---|---|---|---|---|
| Package | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP | 16-TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
| Resolution | 16 Bit | 16 Bit | 24 Bit | 16 Bit | 16 Bit | 16 Bit |
| Number of Channels | 3 Differential | 3 Differential | 3 Differential | 3 Differential | 4 Single-ended / 2 Differential | 4 Single-ended / 2 Differential |
| Interface | SPI | SPI | SPI | SPI | I2C | I2C |
| Supply Voltage | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.25V | 2.7V to 5.5V | 2.7V to 5.5V |
| RMS Noise | 1.5 µV (at 4.17 Hz) | 1.5 µV (at 4.17 Hz) | 1.5 µV (at 4.17 Hz) | 1.5 µV (at 4.17 Hz) | 4 µV (at 15 SPS) | 4 µV (at 15 SPS) |
| On-Chip In-Amp | Yes (Gain 1-128) | Yes (Gain 1-128) | Yes (Gain 1-128) | No | No | No |
Key Differentiators
- On-chip instrumentation amplifier with gain up to 128 (vs ADS1112IDRCT)
- Lower RMS noise (1.5 µV vs 4 µV) (vs ADS1112IDRCT)
- SPI interface vs I2C (vs ADS1112IDRCT)
Design Notes
Decouple the AVDD and DVDD pins with 0.1 µF and 10 µF capacitors placed as close to the pins as possible. Use separate analog and digital ground planes and connect them at a single point to minimize noise coupling. The AD7798BRUZ operates from 2.7V to 5.25V, so ensure the supply is clean and within this range.
For optimal performance, place the reference decoupling capacitor (0.1 µF) close to the REFIN pins. Use a low-leakage capacitor for the reference to maintain accuracy. Route analog inputs away from digital traces to reduce crosstalk. The 16-TSSOP package has a thermal pad; connect it to the ground plane for heat dissipation.
Avoid exceeding the absolute maximum ratings on any pin. Ensure the SPI lines are not driven above DVDD. When using the internal reference, note that it has limited accuracy; for higher precision, use an external reference. Also, the power-down mode (PWRDN pin) should be used to save power, but ensure the SPI interface is idle before entering power-down.
Compliance Information
RoHS3 compliant, REACH unaffected, MSL 1 (Unlimited) per PartGenie.
