AD7880CR

Overview

The AD7880CR is a monolithic 12-bit successive-approximation analog-to-digital converter (ADC) fabricated in Analog Devices' LC2MOS process. It operates from a single +5 V supply and delivers a throughput rate of 66 kS/s with a total conversion time of 12 μs and an acquisition time of 3 μs. The device features a signal-to-noise ratio (SNR) of 70 dB, integral nonlinearity (INL) of ±1 LSB, and differential nonlinearity (DNL) of ±1 LSB. Power consumption is typically 25 mW in normal mode and 2 mW in power save mode. It supports three input ranges: 0 to VREF, 0 to 2VREF, and ±VREF, housed in a 24-lead SOIC package.

Feature Summary

• Integrated track-and-hold amplifier enables high-speed data acquisition without external components.
• Versatile interface logic allows direct connection to standard microprocessors and DSPs.
• Internal resistor network facilitates unipolar and bipolar input configurations on a single supply.

Applications

• Battery powered portable systems
• Digital signal processing
• Speech recognition and synthesis
• High speed modems

Procurement Notes

Verify the specific suffix 'CR' corresponds to the industrial temperature range (-40°C to +85°C) and the SOIC-24 package configuration as defined in the manufacturer's ordering guide. Confirm that the component meets RoHS compliance standards required for your assembly process. Cross-reference the datasheet revision date to ensure all electrical specifications align with current manufacturing standards before finalizing procurement.

Selection Notes

Select the AD7880CR when a 12-bit resolution and 66 kHz sampling rate are required within a single +5 V supply system. This model is suitable for applications needing low power consumption during idle states via the power save mode. Ensure the design accommodates the parallel data bus interface and provides a 2.5 MHz clock source for optimal performance. Consider the ±1 LSB linearity specifications for precision instrumentation requirements.

Part Context

The AD7880 series represents Analog Devices' linear compatible CMOS technology, combining precision bipolar circuits with low-power CMOS logic. The 'C' designation indicates the industrial temperature grade, while 'R' specifies the small outline integrated circuit package. This component belongs to a family of high-speed, low-power ADCs designed for versatile signal conditioning tasks.

Replacement Considerations

Direct pin-compatible alternatives within the same package and temperature range include the AD7880CN and AD7880BN. Verify that substitute parts maintain the same 12-bit resolution, throughput rate, and power supply requirements to ensure functional equivalence in existing designs.

FAQ

How does the AD7880 handle bipolar input signals?

The AD7880 accepts bipolar inputs up to ±VREF by utilizing its internal resistor network. When configured for the ±VREF range, the VINB pin is connected to VREF, allowing the device to digitize signals centered around ground while operating from a single +5 V supply.

What is the maximum clock frequency for the AD7880?

The AD7880 is specified to operate with a clock frequency of 2.5 MHz on the CLKIN pin. Slower clock frequencies may result in degraded accuracy due to leakage effects on the internal hold capacitor.

Can the AD7880 be used in power-sensitive applications?

Yes, the device includes a power save mode accessible via the MODE pin. In this mode, power dissipation drops to approximately 2 mW, making it suitable for battery-powered and handheld equipment.