Features and Benefits
- Fast Throughput Rate: 1 MSPS
- Specified for VDD of 2.35 V to 5.25 V
- Low Power:
4.8 mW typ at 1 MSPS with 3 V Supplies
15.5 mW typ at 1 MSPS with 5 V Supplies
- Wide Input Bandwidth:
71.5 min dB SNR at 100 kHz Input Frequency
- Flexible Power/Serial Clock Speed Management
- No Pipeline Delays
- High Speed Serial Interface SPI®/QSPI™/MICROWIRE™/DSP Compatible
- Standby Mode: 1 µA max
- Daisy Chain Mode
- 8-Lead TSOT Package
- 8-Lead MSOP Package
The AD7912 / AD7922 are 10-bit and 12-bit, high speed, low power, 2-channel, 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 1 MSPS. 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 pipeline delays associated with the part.
The channel to be converted is selected through the DIN pin and the mode of operation is controlled by CS. The serial data stream from the DOUT pin has a channel identifier bit and a mode identifier bit, which provide information about the channel converted and the current mode of operation.
As a result of the Daisy Chain mode of operation, several AD7912 / AD7922 can be connected together in Daisy Chain configuration. The Daisy Chain mode allows the user to read the conversion result from the ADCs contained in the chain.
The AD7912 / AD7922 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 signal.
- 2-channel, 1 MSPS, 10-/12-bit ADCs in TSOT package.
- High throughput with low power consumption.
- Flexible power/serial clock speed management.
The conversion rate is determined by the serial clock. The parts also feature a power-down mode to maximize power efficiency at lower throughput rates. Average power consumption is reduced when the power-down mode is used while not converting. Current consumption is 1 µA maximum and 50 nA typically when in power-down mode.
- Daisy-chain mode.
- 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.
Evaluation Kits (1)
The EVAL-AD7912CBZ is a fully featured evaluation kit for the AD7912. This board operates in stand alone mode or in conjunction with the Evaluation Controller board . When operated with the Evaluation Controller board, software is provided enabling the user to perform detailed analysis of the ADC's performance. This software includes the technical note describing the operation and set up of the evaluation board in standalone operation or when operated with the Evaluation Controller board.
Documentation & Resources
Software & Systems Requirements
AD7912 Companion Parts
Recommended Input Buffer Amplifiers
- For single supply, high speed, low power: ADA4857-1, ADA4841-1, AD8031.
- For precision, low noise, low cost, single supply: AD8605.
- For low distortion, low noise, dual supplies: AD8599.
Recommended Precision 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.
Sample & Buy
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