AD9629BCPZ-20

Analog To Digital Converters (ADC) Overview

The AD9629BCPZ-20 is a monolithic, single-channel 12-bit analog-to-digital converter (ADC) from Analog Devices Inc. It operates at a maximum sampling rate of 20 MSPS with a differential pipeline architecture. The device requires a 1.8 V analog supply and supports digital driver supplies between 1.7 V and 3.6 V. Key electrical specifications include a signal-to-noise ratio (SNR) of 71.4 dBFS at a 9.7 MHz input frequency and a spurious-free dynamic range (SFDR) of 95 dBc. Power consumption is rated at 45 mW at the maximum sample rate with a 1.8 V digital supply. The component is housed in a 32-lead LFCSP package and functions within an industrial temperature range of -40°C to +85°C.

Analog To Digital Converters (ADC) Feature Summary

• Features a high-performance sample-and-hold circuit designed for low power consumption and ease of use.
• Includes an on-chip voltage reference and supports both external and internal reference modes.
• Offers flexible data output formatting options including offset binary, gray code, or twos complement.
• Supports serial port interface (SPI) configuration for clock division, power-down modes, and data alignment.

Analog To Digital Converters (ADC) Applications

• Communications systems including GSM, EDGE, W-CDMA, LTE, CDMA2000, WiMAX, and TD-SCDMA.
• Diversity radio systems and multimode digital receivers.
• Smart antenna systems.
• Battery-powered instruments and handheld scope meters.
• Portable medical imaging and ultrasound applications.

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific speed grade suffix when ordering, as the AD9629 series includes variants with different maximum sampling rates. Confirm that the 32-lead LFCSP package dimensions match the target PCB footprint. Ensure the design accounts for the exposed paddle ground connection requirements specified in the datasheet thermal characteristics section.

Analog To Digital Converters (ADC) Selection Notes

Select the AD9629BCPZ-20 when a 20 MSPS sampling rate is sufficient for the application, offering lower power consumption compared to higher-speed variants. Consider the separate DRVDD supply for compatibility with 1.8 V or 3.3 V logic families. Evaluate the need for SPI programmability versus static hardware configuration based on system complexity.

Analog To Digital Converters (ADC) Part Context

The AD9629BCPZ-20 belongs to the AD9629 family of 12-bit ADCs, which also includes the AD9629-40, AD9629-65, and AD9629-80 models. These components share pinout compatibility and architectural similarities, facilitating migration between different speed grades. The device is part of Analog Devices' portfolio of low-power, high-performance data converters.

Analog To Digital Converters (ADC) Replacement Considerations

The AD9629BCPZ-40, AD9629BCPZ-65, and AD9629BCPZ-80 are pin-compatible alternatives within the same family. Higher speed variants may require adjustments to clocking and power supply decoupling strategies due to increased current consumption and switching noise.

Analog To Digital Converters (ADC) FAQ

What is the function of the MODE/OR pin?

In SPI mode, the MODE/OR pin acts as a chip mode select input to control power-down, standby, or normal operation states. In non-SPI mode, it functions as an out-of-range digital output indicator.

How is the analog input common-mode voltage set?

The analog input common-mode voltage is set by the VCM pin, which outputs a voltage at mid-AVDD supply. This allows users to minimize signal-dependent errors by maintaining the inputs near the center of the supply range.

What data formats are supported by the digital outputs?

The AD9629 supports offset binary, gray code, and twos complement data formats. The format can be selected via the Serial Port Interface (SPI) or statically controlled using the DFS pin in non-SPI mode.