AD9235BCPZ-20

Overview

The AD9235BCPZ-20 is a monolithic, single-channel, 12-bit analog-to-digital converter (ADC) from Analog Devices. It operates at a maximum sampling rate of 20 MSPS and is powered by a single 3 V supply (2.7 V to 3.6 V). The device utilizes a multistage differential pipelined architecture with output error correction logic to ensure no missing codes across the industrial temperature range (-40°C to +85°C). Key electrical specifications include a typical Signal-to-Noise Ratio (SNR) of 70.8 dBc at 2.4 MHz input, a Spurious-Free Dynamic Range (SFDR) of 92.0 dBc, and a Differential Nonlinearity (DNL) of ±0.35 LSB. Power consumption is typically 95 mW with a sine wave input.

Feature Summary

• Integrated high-performance sample-and-hold amplifier (SHA) and voltage reference
• Multistage differential pipelined architecture with output error correction logic
• Flexible analog input configuration supporting both differential and single-ended modes
• Single-ended clock input with duty cycle stabilizer for wide pulse width tolerance

Applications

• Ultrasound equipment
• IF sampling in communications receivers
• Battery-powered instruments
• Hand-held scopemeters
• Low cost digital oscilloscopes

Procurement Notes

Verify the specific suffix 'BCPZ' corresponds to the LFCSP-32 package variant when sourcing. Confirm that the -20 designation strictly limits the maximum conversion rate to 20 MSPS. Ensure compatibility with the required 3 V analog supply and appropriate DRVDD levels for the target logic family before finalizing procurement orders.

Selection Notes

Select this component for applications requiring 12-bit resolution at moderate speeds up to 20 MSPS. The LFCSP-32 package offers thermal advantages over TSSOP variants. Consider the internal reference options and flexible input span (1 V p-p to 2 V p-p) when designing the analog front end. Verify that the 7-cycle pipeline latency aligns with system timing requirements.

Part Context

This part belongs to the AD9235 family, which includes -20, -40, and -65 speed grades. All variants share identical pinouts and architectural features, differing only in maximum sampling rates. The BCPZ suffix indicates the 32-lead Lead Frame Chip Scale Package (LFCSP), providing a compact footprint suitable for space-constrained designs compared to the 28-lead TSSOP option.

Replacement Considerations

The AD9235BRUZ-20 serves as a direct functional replacement using the TSSOP-28 package. For systems originally designed with the 10-bit AD9214-65, the AD9235 provides a simplified upgrade path due to similar pinout characteristics, though speed and resolution differences must be accounted for.