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AD 7291 B :: 12-bit A/D Converter, SAR A/D, LFCSP-20

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Item-No.: AD 7291 B
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AD 7291 B

  • Product Description
  • Technical information
  • General
    • Modelname
    • A/D converter
    • Type
    • 12-bit
    • Design
    • SAR A/D with temperature sensor
    • Housing
    • LFCSP-20
    • Mounting form
    • LFCSP-20
    • Temperature range
    • -40…+105
  • Electrical values
    • Supply voltage
    • 2,8 - 3,6 VDC
    • Input voltage
    • 0 - 2,5 VDC
    • Output voltage
    • Low 0,4, High 3,3 VDC
    • Temperature coefficient
    • 12 - 35
AD 7291
The AD7291 is a 12-bit, low power, 8-channel, successive approximation analog-to-digital converter (ADC) with an internal temperature sensor.
The part operates from a single 3.3 V power supply and features an I2C-compatible interface. The part contains a 9-channel multiplexer and a track-and-hold amplifier than can handle frequencies up to 30 MHz. The device has an on-chip 2.5 V reference that can be disabled to allow the use of an external reference.
The AD7291 provides a 2-wire serial interface compatible with I2C interfaces. The I2C interface supports standard and fast I2C interface modes. The AD7291 normally remains in a partial power-down state while not converting and powers up for conversions. The conversion process can be controlled by a command mode where conversions occur across I2C write operations or an autocycle mode selected through software control.
The AD7291 includes a high accuracy band gap temperature sensor, which is monitored and digitized by the 12-bit ADC to give a resolution of 0.25°C.
The AD7291 offers a programmable sequencer, which enables the selection of a preprogrammable sequence of channels for conversion.
On-chip limit registers can be programmed with high and low limits for the conversion results; an out-of-range indicator output (ALERT) becomes active when the programmed high or low limits are violated by the conversion result. This output can be used as an interrupt.

FEATURES
• 12-bit SAR ADC
- 8 single-ended inputs Channel sequencer functionality
- Fast throughput of 1 MSPS
- Analog input range: 0 V to 2.5 V
• 12-bit temperature-to-digital converter
• Temperature sensor accuracy of ±1°C
• Temperature range: -40°C to +125°C
• Specified for VDD: 2.8 V to 3.6 V
• Logic voltage VDRIVE : 1.65 V to 3.6 V
• Power-down current: <10 µA
• Internal 2.5 V reference
• Internal power-on reset
• High speed serial interface SPI
• 20-lead LFCSP



Manufacturer : ANALOG DEVICES
Factory number : AD7291BCPZ   
Package weight : 0.001 kg
RoHS : conform
Technical information
  • General
    • Modelname
    • A/D converter
    • Type
    • 12-bit
    • Design
    • SAR A/D with temperature sensor
    • Housing
    • LFCSP-20
    • Mounting form
    • LFCSP-20
    • Temperature range
    • -40…+105
  • Electrical values
    • Supply voltage
    • 2,8 - 3,6 VDC
    • Input voltage
    • 0 - 2,5 VDC
    • Output voltage
    • Low 0,4, High 3,3 VDC
    • Temperature coefficient
    • 12 - 35
Datasheet/manual