Features: Fast Throughput Rate: 1 MSPS
Specified for VDD of 2.35V to 5.25V
Low Power:
3.6 mW Typ at 1 MSPS with 3 V Supplies
12.5 mW Typ at 1 MSPS with 5 V Supplies
Wide Input Bandwidth:
71 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
6-Lead SC70 Package
8-Lead MSOP Package
APPLICATIONS
Battery-Powered Systems
Personal Digital Assistants
Medical Instruments
Mobile Communications
Instrumentation and Control Systems
Data Acquisition Systems
High Speed Modems
Optical Sensors
Specifications(TA= 25°C, unless otherwise noted.)VDD to GND . . . . . . . . . . . . . . . 0.3 V to +7 V
Analog Input Voltage to GND . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to VDD + 0.3 V
Digital Input Voltage to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to +7 V
Digital Output Voltage to GND . . . . . . . . . . . . . . . . . . . . . . . . 0.3 V to VDD + 0.3 V
Input Current to Any Pin except Supplies2 . . . . . . . . . . . . . . . . . . . . . . . . . . ±10 mA
Operating Temperature Range
Commercial (A and B Grades) . . . . . . . . . . . . . . . . . . . . . . . . . . . .40°C to +85°C
Industrial (Y Grade) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40°C to +125°C
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to +150°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150°C
MSOP Package
NOTES
1 Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
2 Transient currents of up to 100 mA will not cause SCR latch-up.
DescriptionThe AD7476A/AD7477A/AD7478A are 12-bit, 10-bit, and 8-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 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 of AD7476A/AD7477A/AD7478A 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 tech- niques to achieve low power dissipation at high throughput rates.The reference for the part is taken internally from VDD, which 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 of AD7476A/AD7477A/AD7478A.
AD7478A* Data Sheet
