Overview
The AD9238BSTZ-20 is a dual, 3 V, 12-bit analog-to-digital converter (ADC) produced by Analog Devices Inc. This component features dual high-performance sample-and-hold amplifiers (SHAs) and an integrated voltage reference. It uses a multistage differential pipelined architecture with output error correction logic to ensure 12-bit accuracy and guarantee no missing codes over the full operating temperature range. The AD9238 is available in a Pb-free, space-saving 64-lead LQFP or LF-CSP package and is specified over the industrial temperature range of -40°C to +85°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 12-bit | |
| Sample Rate | 20 MSPS | |
| Supply Voltage | 2.7 V to 3.6 V | V |
| Power Consumption | 180 mW | mW |
| Signal-to-Noise Ratio (SNR) | 70 dB (to Nyquist) | dB |
| Spurious Free Dynamic Range (SFDR) | 80.5 dBc (to Nyquist) | dBc |
| Analog Input Bandwidth | 500 MHz, 3 dB bandwidth | |
| Analog Input Range | 1 V p-p to 2 V p-p | |
| Crosstalk Immunity | > 85 dB | dB |
| Operating Temperature Range | -40°C to +85°C | °C |
| Package Type | 64-lead LQFP or LF-CSP |
Key Features
- Integrated dual 12-bit ADC with dual high-performance sample-and-hold amplifiers and an integrated voltage reference.
- Single 3 V supply operation (2.7 V to 3.6 V).
- Low power consumption: 180 mW at 20 MSPS.
- Differential input with 500 MHz, 3 dB bandwidth.
- Exceptional crosstalk immunity > 85 dB.
- Flexible analog input: 1 V p-p to 2 V p-p range.
- Offset binary or twos complement data format.
- Clock duty cycle stabilizer.
- Output datamux option for multiplexed data output.
Applications
- Ultrasound equipment.
- Direct conversion or IF sampling receivers in wireless communication systems (e.g., WB-CDMA, CDMA2000, WiMAX).
- Battery-powered instruments.
- Hand-held oscilloscopes and low-cost digital oscilloscopes.
- Multiplexed systems that switch full-scale voltage levels in successive channels.
Q & A
- What is the resolution of the AD9238BSTZ-20?
The AD9238BSTZ-20 has a resolution of 12 bits.
- What are the available sample rates for the AD9238?
The AD9238 is available in speed grades of 20 MSPS, 40 MSPS, and 65 MSPS.
- What is the typical power consumption of the AD9238BSTZ-20?
The typical power consumption of the AD9238BSTZ-20 is 180 mW at 20 MSPS.
- What is the analog input bandwidth of the AD9238?
The analog input bandwidth of the AD9238 is 500 MHz with a 3 dB bandwidth.
- What data formats are supported by the AD9238?
The AD9238 supports offset binary or twos complement data formats.
- Does the AD9238 have a clock duty cycle stabilizer?
Yes, the AD9238 includes a clock duty cycle stabilizer to maintain performance over a wide range of clock duty cycles.
- What are the typical operating temperature ranges for the AD9238?
The AD9238 operates over an industrial temperature range of -40°C to +85°C.
- What package types are available for the AD9238?
The AD9238 is available in 64-lead LQFP or LF-CSP packages.
- What are some common applications for the AD9238?
The AD9238 is commonly used in ultrasound equipment, wireless communication systems, battery-powered instruments, and hand-held oscilloscopes.
- Is the AD9238 pin-compatible with other ADC models?
Yes, the AD9238 is pin-compatible with the AD9248, a 14-bit ADC.
