Features and Benefits
- Fast throughput rate: 1 MSPS
- Specified for VDD of 2.35 V to 5.25 V
- Low power
3.6 mW at 1 MSPS with 3 V supplies
12.5 mW at 1 MSPS with 5 V supplies
- Flexible power/serial clock speed management
- No pipeline delays
- High speed serial interface
- See data sheet for additional features
The AD7476A / AD7477A / AD7478A are 12-bit, 10-bit, and 8-bit high speed, low power, successive-approximation analog-to-digital converters (ADCs), respectively. The parts operate from a single 2.35 V to 5.25 V power supply and feature throughput rates up to 1 MSPS. The parts contain a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 13 MHz. The conversion process and data acquisition are controlled using CS and the serial clock, allowing the devices to interface with microprocessors or DSPs. The input signal is sampled on the falling edge of CS, and the conversion is also initiated at this point. There are no pipeline delays associated with the parts. The AD7476A / AD7477A / AD7478A use advanced design techniques to achieve low power dissipation at high throughput rates. The reference for the part is taken internally from VDD to allow the widest dynamic input range to the ADC. Thus, the analog input range for the part is 0 V to VDD. The conversion rate is determined by the SCLK.
- First 12-/10-/8-bit ADCs in a SC70 package.
- High throughput with low power consumption.
- Flexible power/serial clock speed management. The conversion rate is determined by the serial clock, allowing the conversion time to be reduced through the serial clock speed increase. This allows the average power consumption to be reduced when a power-down mode is used while not converting. The parts also feature a power-down mode to maximize power efficiency at lower throughput rates. Current consumption is 1 µA maximum and 50 nA typically when in power-down mode.
- Reference derived from the power supply.
- No pipeline delay. The parts feature a standard successive approximation ADC with accurate control of the sampling instant via a CS input and once-off conversion control.
- Battery-powered systems
Personal digital assistants
- Instrumentation and control systems
- Data acquisition systems
- High speed modems
- Optical sensors
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
The Data Conversion Handbook, 20051/2/2005
Designing Power Supplies for High Speed ADC2/1/2012
Skin Impedance Analysis Aids Active and Passive Transdermal Delivery6/1/2009 Analog Dialogue
How to Save Power in Battery Applications Using the Power-Down Mode in an ADC9/1/2003 Analog Dialogue
Software & Systems Requirements
AD7476A Companion Parts
Recommended Driver Amplifiers
- For precision, wide supply, low cost: ADA4000-1.
- For precision, single supply, low cost, R-R In/Out: AD8655, ADA4084-2.
- For high speed and low noise: AD8021, ADA4897-1, ADA4899-1.
Recommended Precison References
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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