Overview
The AD9238BST-20 is a high-performance, dual 12-bit analog-to-digital converter (ADC) produced by Analog Devices Inc. This device is part of the AD9238 series, which features dual independent ADC paths with a shared internal band gap reference source. The AD9238 is designed for high-speed applications, offering sampling rates of 20 MSPS, 40 MSPS, and 65 MSPS. It is fabricated on an advanced CMOS process and is available in a Pb-free, 64-lead Low Profile Quad Flat Package (LQFP) or Lead Frame Chip Scale Package (LFCSP).
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 12-bit | |
| Sampling Rate | 20 MSPS (AD9238-20), 40 MSPS (AD9238-40), 65 MSPS (AD9238-65) | MSPS |
| Input Type | Differential | |
| Input Range | 1 V p-p to 2 V p-p | V p-p |
| Power Supply | AVDD = 3 V, DRVDD = 2.5 V | V |
| Power Consumption | 180 mW (20 MSPS), 330 mW (40 MSPS), 600 mW (65 MSPS) | mW |
| Operating Temperature | -40°C to +85°C | °C |
| Package Type | 64-Lead LQFP or LFCSP | |
| Channel Isolation | 85 dB at fIN = 10 MHz | dB |
Key Features
- Dual high-performance sample-and-hold amplifiers (SHAs) with differential inputs and a bandwidth of 500 MHz, 3 dB.
- Flexible analog input range: 1 V p-p to 2 V p-p, with ac- or dc-coupled options in differential or single-ended modes.
- Integrated voltage reference with options for fixed or adjustable reference voltages.
- Multistage differential pipelined architecture with output error correction logic to ensure 12-bit accuracy and no missing codes over the full operating temperature range.
- Low power consumption with speed grade options to balance power, cost, and performance.
- High channel isolation of 85 dB at fIN = 10 MHz.
- Output data format options: offset binary or two's complement.
- Clock duty cycle stabilizer and output data multiplexing option).
Applications
- Ultrasound equipment
- Direct conversion or IF sampling receivers for wireless communication standards like WB-CDMA, CDMA2000, WiMAX
- Battery-powered instruments and hand-held oscilloscopes
- Low-cost digital oscilloscopes
Q & A
- What is the resolution of the AD9238BST-20?
The AD9238BST-20 has a resolution of 12 bits.
- What are the available sampling rates for the AD9238 series?
The AD9238 series offers sampling rates of 20 MSPS, 40 MSPS, and 65 MSPS.
- What is the input type and range of the AD9238BST-20?
The input type is differential, and the input range is from 1 V p-p to 2 V p-p.
- What is the power consumption of the AD9238BST-20 at different sampling rates?
The power consumption is 180 mW at 20 MSPS, 330 mW at 40 MSPS, and 600 mW at 65 MSPS.
- What is the operating temperature range of the AD9238BST-20?
The operating temperature range is from -40°C to +85°C.
- What package types are available for the AD9238BST-20?
The device is available in a 64-lead LQFP or LFCSP package.
- What is the channel isolation of the AD9238BST-20?
The channel isolation is 85 dB at fIN = 10 MHz.
- Does the AD9238BST-20 support different data formats?
Yes, it supports both offset binary and two's complement data formats.
- What are some typical applications of the AD9238BST-20?
Typical applications include ultrasound equipment, direct conversion or IF sampling receivers, battery-powered instruments, and low-cost digital oscilloscopes.
- Is the AD9238BST-20 Pb-free and RoHS compliant?
Yes, the AD9238BST-20 is Pb-free and RoHS compliant.
