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AD7997BRU-0
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Product Detailed Parameters
- Description：IC ADC 10BIT SAR 20TSSOP
- Series：-
- Mfr：Analog Devices Inc.
- Package：Tube
- Number of Bits：10
- Sampling Rate (Per Second)：188k
- Number of Inputs：8
- Input Type：Single Ended
- Data Interface：I2C
- Configuration：MUX-S/H-ADC
- Ratio - S/H:ADC：1:01
- Number of A/D Converters：1
- Architecture：SAR
- Reference Type：External
- Voltage - Supply, Analog：2.7V ~ 5.5V
- Voltage - Supply, Digital：2.7V ~ 5.5V
- Features：-
- Operating Temperature：-40°C ~ 85°C
- Package / Case：20-TSSOP (0.173", 4.40mm Width)
- Supplier Device Package：20-TSSOP
- Mounting Type：Surface Mount
- Grade：-
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Overview
The AD7997BRU-0 is an 8-channel, 10-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It features a single-ended input architecture and operates from a 2.7 V to 5.5 V supply. The device supports I2C-compatible serial interfaces with standard and fast modes. Key electrical parameters include a typical conversion time of 2 µs, a throughput rate up to 188 kSPS, and a maximum power dissipation of 7 mW during operation. Integral nonlinearity is specified at ±0.5 LSB max, while differential nonlinearity is also ±0.5 LSB max. The component is housed in a 20-lead TSSOP package and functions within a temperature range of −40°C to +85°C.
Feature Summary
- Integrates an 8-channel multiplexer and track-and-hold amplifier for single-ended signals.
- Supports automatic shutdown mode to minimize power consumption when not converting.
- Includes programmable limit registers with an open-drain out-of-range alert output.
Applications
- Battery-powered data acquisition systems
- Industrial process control monitoring
- Portable instrumentation
Procurement Notes
Verify the specific suffix 'RU' against current manufacturer documentation to confirm package type and availability status. Ensure the selected variant matches the required I2C addressing configuration via the AS pin. Cross-reference the datasheet revision to validate all electrical specifications before finalizing procurement orders.
Selection Notes
Select this component for applications requiring low power consumption and multiple single-ended inputs. Compare performance metrics against the AD7998 if higher resolution is needed. Verify that the system interface supports the required I2C clock frequencies for the desired throughput rate.
Part Context
This part belongs to the AD7997/AD7998 family of low-power, multi-channel ADCs. It shares architectural similarities with the AD7992 and AD7994 but provides eight channels instead of two or four. The BRU designation indicates a specific commercial temperature grade and packaging option within the broader product line.
Replacement Considerations
Direct substitutes include the AD7997BRUZ-0REEL. Verify pin compatibility and electrical specifications before substitution.
FAQ
How is the I2C address determined?
The I2C address is pin-selectable via the AS pin. Connecting AS to AGND, VDD, or leaving it floating selects one of three available addresses.
What is the function of the ALERT/BUSY pin?
The ALERT/BUSY pin can be configured as an out-of-range indicator that activates when conversion results violate programmed limits, or as a busy signal indicating active conversion.
Can the reference voltage exceed the supply voltage?
No, the external reference voltage applied to the REFIN pin must be between 1.2 V and VDD.
