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AD7910/AD7920: 250 kSPS, 10-/12-Bit ADCs in 6 Lead SC70 Data Sheet (Rev. C)2/3/2003PDF486 kB
Overview
Features and Benefits
- Specified for VDD of 2.35 V to 5.25 V
- Low Power:
3 mW typ at 250 KSPS with 3 V Supplies
12.5 mW typ at 250 KSPS with 5 V Supplies - Wide Input Bandwidth:
70 dB SNR at 100 kHz Input Frequency - Flexible Power/Serial Clock Speed Management
- Throughput Rate: 250 kSPS
- No Pipeline Delays
- High Speed Serial Interface SPI®/QSPI™/MICROWIRE™/DSP Compatible
- Standby Mode: 1 µA max
- 6-Lead SC70 Package
- 8-Lead µSOIC Package
Product Details
The AD7910 / AD7920 are 10-bit and 12-bit, high speed, low power, successive-approximation ADCs respectively. The parts operate from a single 2.35 V to 5.25 V power supply and feature throughput rates up to 250 kSPS. The parts contain a low-noise, wide bandwidth track/hold amplifier, which can handle input frequencies in excess of 6 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 pipelined delays associated with the part.
The AD7910 / AD7920 use advanced design techniques to achieve very low power dissipation at high throughput rates.
The reference for the part is taken internally from VDD. This allows the widest dynamic input range to the ADC. Thus the analog input range for the part is 0 to VDD. The conversion rate is determined by the SCLK.
PRODUCT HIGHLIGHTS
- 10-/12-bit ADCs in SC70 and MSOP packages.
- 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 power-down mode is used while not converting. The part also features 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.
APPLICATIONS
- Battery-powered systems
Personal digital assistants
Medical instruments
Mobile communications - Instrumentation and control systems
- Data acquisition systems
- High speed modems
- Optical sensors
Product Categories
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.
Evaluation Kits (1)
Documentation & Resources
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8- to 18-Bit SAR ADCs ... From the Leader in High Performance Analog3/8/2008PDF1885 kB
Product Recommendations
AD7910 Companion Parts
Design Resources
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.
PCN-PDN Information
Sample & Buy
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