AD7899BR-1

Overview

The AD7899BR-1 is a 14-bit successive-approximation analog-to-digital converter operating from a single 5 V supply. It achieves a maximum throughput rate of 400 kSPS with a conversion time of 2.2 µs and an acquisition time of 0.3 µs. The device features ±5 V and ±10 V bipolar input ranges, utilizing two's complement output coding. It includes an internal 2.5 V reference, on-chip clock oscillator, and overvoltage protection on analog inputs. Typical power consumption is 80 mW in normal mode, reducing to 100 µW in standby. The component is housed in a 28-lead SOIC package.

Feature Summary

• Integrated signal conditioning circuitry supporting multiple bipolar input voltage ranges without external scaling components.
• High-speed parallel interface compatible with both 3 V and 5 V digital logic systems via the VDRIVE pin.
• Built-in track/hold amplifier ensures accurate sampling at full throughput rates with minimal aperture jitter.
• Analog inputs feature robust overvoltage protection allowing operation beyond specified input ranges without damage.

Applications

• Industrial process control systems requiring high-resolution data acquisition.
• Portable instrumentation powered by single-supply batteries.
• Digital signal processing front-ends interfacing with 3 V microprocessors.
• Vibration monitoring and acoustic analysis equipment.

Procurement Notes

Verify the specific suffix BR-1 confirms the ±5 V and ±10 V input range configuration and the commercial temperature grade (-40°C to +85°C). Confirm the package type matches the required PCB footprint, as this model utilizes the SOIC-28 form factor. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS input structures.

Selection Notes

Select the AD7899BR-1 when bipolar signals within ±10 V are present and direct interfacing is desired. Choose this variant over the -2 or -3 versions if unipolar or narrower bipolar ranges are insufficient for the application. Consider the external clock option if precise synchronization with other system components is required instead of the internal oscillator.

Part Context

This component belongs to the AD7899 family of fast, low-power ADCs from Analog Devices. The BR-1 designation specifically denotes the version optimized for standard industrial bipolar voltage ranges. It shares architectural similarities with the AR and SR variants but differs in accuracy specifications and temperature ratings.

Replacement Considerations

The AD7899AR-1 serves as a lower-accuracy alternative within the same package and electrical specification set. The AD7899SR-1 offers extended military temperature capabilities but maintains similar functional characteristics. Verify pin compatibility and timing requirements when substituting these models.