Features and Benefits
- Fast throughput rate: 1 MSPS
- Specified for AVDD of 2.7 V to 5.25 V
- Low power:
6 mW maximum at 1 MSPS with 3 V supplies
13.5 mW maximum at 1 MSPS with 5 V supplies
- 4 single-ended inputs with sequencer
- Wide input bandwidth:
AD7924, 70 dB SNR at 50 kHz input frequency
- Flexible power/serial clock speed management
- No pipeline delays
- High speed serial interface: SPI/QSPI™/ MICROWIRE™/DSP compatible
- Shutdown mode: 0.5 μA maximum
- 16-lead TSSOP package
- Qualified for automotive applications
The AD7904 / AD7914 / AD7924 are, respectively, 8-bit, 10-bit, and 12-bit, high speed, low power, 4-channel successive approximation ADCs. The parts operate from a single 2.7 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 8 MHz.
The conversion process and data acquisition are controlled using CS and the serial clock signal, allowing the device to easily inter-face with microprocessors or DSPs. The input signal is sampled on the falling edge of CS and conversion is also initiated at this point. There are no pipeline delays associated with the part.
The AD7904 / AD7914 / AD7924 use advanced design techniques to achieve very low power dissipation at maximum throughput rates. At maximum throughput rates, the AD7904 / AD7914 / AD7924 consume 2 mA maximum with 3 V supplies; with 5 V supplies, the current consumption is 2.7 mA maximum.
Through the configuration of the control register, the analog input range for the part can be selected as 0 V to REFIN or 0 V to 2 × REFIN, with either straight binary or twos complement output coding. The AD7904 / AD7914 / AD7924 each feature four single-ended analog inputs with a channel sequencer to allow a pre-programmed selection of channels to be converted sequentially.
The conversion time for the AD7904 / AD7914 / AD7924 is determined by the SCLK frequency, which is also used as the master clock to control the conversion.
- High Throughput with Low Power Consumption.
The AD7904/AD7914/AD7924 offer throughput rates up to 1 MSPS. At the maximum throughput rate with 3 V supplies, the AD7904/AD7914/AD7924 dissipate only 6 mW of power maximum.
- Four Single-Ended Inputs with Channel Sequencer.
A consecutive sequence of channels can be selected, through which the ADC will cycle and convert on.
- Single-Supply Operation with VDRIVE Function.
The AD7904/AD7914/AD7924 operate from a single 2.7 V to 5.25 V supply. The VDRIVE function allows the serial interface to connect directly to 3 V or 5 V processor systems, independent of VDD.
- Flexible Power/Serial Clock Speed Management.
The conversion rate is determined by the serial clock, allowing the conversion time to be reduced by increasing the serial clock speed. The parts also feature two shutdown modes to maximize power efficiency at lower throughput rates. Current consumption is 0.5 µA maximum when in full shutdown.
- No Pipeline Delay.
The parts feature a standard successive approximation ADC with accurate control of the sampling instant via the CS input and once-off conversion control.
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-AD79X4CBZ is a fully featured evaluation kit for the AD7904, AD7914 and AD7924. Accompanying each EVAL-AD79X4CB is a sample box containing AD7924, one AD7914, and one AD7904. Depending on the ADC required for evaluation, the user can place the required ADC in the socket on the EVAL-AD79X4CB.
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
AD7904 Companion Parts
Recommended Precison References - 2.5V
- For applications requiring the lowest noise performance and output trim adjust: ADR441.
- For high output current applications: ADR431, REF192.
- For wide supply applications: AD780.
- For cost sensitive applications: AD1582, ADR391.
Recommended Input Buffer Amplifiers
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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