PDF AD7291 Data sheet ( Hoja de datos )

Número de pieza	AD7291
Descripción	12-Bit SAR ADC
Fabricantes	Analog Devices
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No Preview Available ! Preliminary Technical Data FEATURES 12 bit SAR ADC 8 single-ended inputs Channel sequencer functionality Analog Input Range 0 to 2.5V 12-bit temperature-to-digital converter Temperature sensor accuracy of ±2°C typical Temperature range: −40°C to +125°C Specified for VDD of 2.8 V to 3.6V Logic Voltage VDRIVE = 1.65V to 3.6V Power-down current : <10 µA Internal 2.5V Reference I2C-compatible serial interface supports standard & fast modes 20-lead LFCSP 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor AD7291 Functional Block Diagram GENERAL DESCRIPTION The AD7291 is a 12-bit, high speed, low power, 8-channel, successive approximation ADC with an internal temperature sensor. The part operates from a single 3.3V power supply and features an I2C®-compatible interface. The track-and-hold amplifier which can handle input frequencies of up to 70MHz, and a multiplexer allows samples from eight channels. Each AD7291 provides a 2-wire serial interface compatible with www.DaI2tCaSihneteertf4aUc.ecso.mThe AD7291 offers a programmable sequencer, which enables the selection of a pre-programmable sequence of channels for conversion. The device has an on-chip 2.5 V reference that can be disabled to allow the use of an external reference. The AD7291 includes a high accuracy band-gap temperature sensor, which is monitored and digitized by the12-bit ADC to give a resolution of 0.25°C. The AD7291 uses advanced design techniques to achieve very low power dissipation at high throughput rates. The part also offers flexible power/throughput rate management options and is offered in a 20 lead LFCSP package Figure 1. PRODUCT HIGHLIGHTS 1. Ideally suited to monitoring system variables in a variety of systems including telecommunications, process and industrial control 2. I2C-compatible serial interface. Standard and fast modes. 3. Eight Single-Ended Inputs with a Channel Sequencer. A consecutive sequence of channels can be selected on which the ADC cycles and converts. 4. Integrated temperature sensor with 0.25°C resolution. Table 1. AD7298 and Related Products Device Resolution Interface Features AD7298 12-Bit SPI 8 Channel ADC & Temp Sensor AD7291 12-Bit I2C 8 Channel ADC & Temp Sensor Rev. PrC Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,nor for anyinfringementsofpatentsor other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2009 Analog Devices, Inc. All rights reserved. 1 page AD7291 ABSOLUTE MAXIMUM RATINGS Table 4. Parameter VDD to AGND, DGND, VDRIVE to AGND, DGND, Analog Input Voltage to AGND Digital Input Voltage to AGND Digital Output Voltage to AGND VREF to AGND AGND to DGND Input Current to Any Pin Except Supplies1 Operating Temperature Range Storage Temperature Range Junction Temperature LFCSP Package θJA Thermal Impedance θJC Thermal Impedance Pb-free Temperature, Soldering Reflow ESD Rating −0.3 V to +5 V −0.3 V to + 5 V −0.3 V to 3V −0.3 V to VDRIVE + 0.3 V −0.3 V to VDRIVE + 0.3 V −0.3 V to +3V −0.3 V to +0.3V ±10 mA −40°C to +125°C −65°C to +150°C 150°C TBD°C/W TBD°C/W 260(+0)°C 2 kV 1 Transient currents of up to 100 mA do not cause latch-up. Preliminary Technical Data 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 indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ESD CAUTION www.DataSheet4U.com Rev. PrC \| Page 5 of 21 5 Page Preliminary Technical Data Table 7. AD7291 Register Addresses HEX P5 P4 P3 P2 P1 P0 Registers Code 0x00 0 0 0 0 0 0 Command Register 0x01 0 0 0 0 0 1 Voltage Conversion Result Register 0x02 0 0 0 0 1 0 TSENSE Conversion Result Register 0x03 0 0 0 0 1 1 TSENSE Average Result Register 0x04 0 0 0 1 0 0 DATAHIGH Reg CH1 0x05 0 0 0 1 0 1 DATALOW Reg CH1 0x06 0 0 0 1 1 0 Hysteresis Reg CH1 0x07 0 0 0 1 1 1 DATAHIGH Reg CH2 0x08 0 0 1 0 0 0 DATALOW Reg CH2 0x09 0 0 1 0 0 1 Hysteresis Reg CH2 0x0A 0 0 1 0 1 0 DATAHIGH Reg CH3 0x0B 0 0 1 0 1 1 DATALOW Reg CH3 0x0C 0 0 1 1 0 0 Hysteresis Reg CH3 0x0D 0 0 1 1 0 1 DATALOW Reg CH4 0x0E 0 0 1 1 1 0 DATAHIGH Reg CH4 0x0F 0 0 1 1 1 1 Hysteresis Reg CH4 0x10 0 1 0 0 0 0 DATAHIGH Reg CH5 0x11 0 1 0 0 0 1 DATALOW Reg CH5 0x12 0 1 0 0 1 0 Hysteresis Reg CH5 0x13 0 1 0 0 1 1 DATAHIGH Reg CH6 0x14 0 1 0 1 0 0 DATALOW Reg CH6 0x15 0 1 0 1 0 1 Hysteresis Reg CH6 0x16 0 1 0 1 1 0 DATAHIGH Reg CH7 0x17 0 1 0 1 1 1 DATALOW Reg CH7 0x18 0 1 1 0 0 0 Hysteresis Reg CH7 0x19 0 1 1 0 0 1 DATAHIGH Reg CH8 0x1A 0 1 1 0 1 0 DATALOW Reg CH8 www.Data0Sxh1eBet4U0.com 1 1 0 1 1 Hysteresis Reg CH8 0x1C 0 1 1 1 0 0 DATAHIGH Reg TSENSE 0x1D 0 1 1 1 0 1 DATALOW Reg TSENSE 0x1E 0 1 1 1 1 0 Hysteresis Reg TSENSE 0x1F 0 1 1 1 1 1 Alert Status Register A 0x20 1 0 0 0 0 0 Alert Status Register B 0x3F 1 1 1 1 1 1 Factory Test Mode AD7291 Read or Write Write Read Read Read Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read/Write Read Read The user should not access this register. Rev. PrC \| Page 11 of 21 11 Page

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