DatasheetsPDF.com

AD7280 Dataheets PDF



Part Number AD7280
Manufacturers Analog Devices
Logo Analog Devices
Description Lithium Ion Battery Monitoring System
Datasheet AD7280 DatasheetAD7280 Datasheet (PDF)

Preliminary Technical Data FEATURES 12-bit ADC, 1us per channel conversion time 6 Analog Input Channels, CM range 0.5V to 27.5V 6 Temperature Measurements Inputs. On Chip Voltage Regulator Cell Balancing Interface Daisy Chain Interface www.DataSheet4U.com 3 ppm Reference Low Quiescent Current High Input Impedance Serial Interface with Alert Function 1 SPI interface for up to 300 channels On Chip Registers for Channel Sequencing VDD Operating Range 7.5V to 30V Temperature Range -40 oC to 105oC 48.

  AD7280   AD7280


Document
Preliminary Technical Data FEATURES 12-bit ADC, 1us per channel conversion time 6 Analog Input Channels, CM range 0.5V to 27.5V 6 Temperature Measurements Inputs. On Chip Voltage Regulator Cell Balancing Interface Daisy Chain Interface www.DataSheet4U.com 3 ppm Reference Low Quiescent Current High Input Impedance Serial Interface with Alert Function 1 SPI interface for up to 300 channels On Chip Registers for Channel Sequencing VDD Operating Range 7.5V to 30V Temperature Range -40 oC to 105oC 48 lead LQFP and LFCSP Packages Lithium Ion Battery Monitoring System AD7280 FUNCTIONAL BLOCK DIAGRAM V DD SCLKhi SDINhi SDOUThi ALERThi CShi PDhi CNVSThi CB1 CB6 AD7280 Vin(6) Vin(5) Vin(4) Vin(3) Vin(2) Vin(1) Vin(0) MUX + - DAIS Y CHAIN INTER FACE CEL L BALANCING INTER FACE REGUL ATOR VREG DGND DVCC + - 12 BIT ADC AVCC VDRIVE VT(6) VT(5) VT(4) VT(3) VT(2) VT(1) VT TERM CLOCK CONTRO L LOGIC & SELF TEST SCLK SDIN SDO UT ALERT CS PD CNVST MASTER VREF CREF REFGND 2.5V REF LIMIT REG SQN LOGIC DATA MEMO RY SPI INTER FACE VSS AGND APPLICATIONS Lithium Ion Battery Monitoring Nickel Metal Hydride Battery Monitoring Figure 1 GENERAL DESCRIPTION The AD72801 contains all the functions required for general purpose monitoring of stacked Lithium Ion batteries as used in Hybrid Electric Vehicles. The part has multiplexed analog input and temperature measurement channels for up to six cells of battery management. An internal 3-ppm reference is provided to drive the ADC. The ADC resolution is 12 bits with a 1 Msps throughput rate offering a 1µs conversion time. The AD7280 operates from just one VDD supply which has a range of 7.5V to 30V (with an absolute max rating of 33V). The part provides 6 pseudo differential analog input channels to accommodate large common mode signals across the full VDD range. Each channel allows an input signal range, Vin(+) -Vin(-), of 0V to 5V. The input pins assume a series stack of 6 cells. In addition the part can accommodate 6 external sensors for temperature measurement. The AD7280 includes on chip registers which allow a sequence of channel measurements to be programmed to suit the applications requirements. The AD7280 also includes an Alert function which generates an interrupt output signal if the cell voltages exceed an upper or lower limit defined by the user. The AD7280 has balancing interface outputs designed to control external FET transistors to allow discharging of individual cells. The AD7280 includes a Built In Self Test feature which internally applies a known voltage to the ADC inputs. There is a daisy chain interface which allows up to 50 parts to be stacked without the need for individual device isolation. The AD7280 requires only one supply pin which takes 7mA under normal operation, while converting at 1 Msps. All this functionality is provided in a 48 pin LQFP or 48 pin LFCSP package operating over a temperature range of −40°C to +105°C. 1 Patents Pending Rev. PrD Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or 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. Trademarks and registered trademarks are the property of their respective owners. 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 ©2008 Analog Devices, Inc. All rights reserved. SDOUTlo ALERTlo AD7280 SPECIFICATIONS Table 1. Parameter1 DC ACCURACY [Vin(0) to Vin(6)]2 Resolution Integral Nonlinearity Differential Nonlinearity Offset Error Offset Error Drift Offset Error Match w . D a t a S Gain Error Gain Error Drift Gain Error Match ADC Unadjusted Error3 Total Unadjusted Error4 ANALOG INPUTS [Vin(0) to Vin(6)] Pseudo Differential Input Voltage Vin(n) – Vin(n-1) Absolute Input Voltage Common Mode Input Voltage DC Leakage Current Input Capacitance DC ACCURACY [VT1 to VT6]2 Resolution Integral Nonlinearity Differential Nonlinearity Offset Error Offset Error Drift Offset Error Match Gain Error Gain Error Drift Gain Error Match ADC Unadjusted Error5 Total Unadjusted Error6 ANALOG INPUTS (VT1 to VT6) Input Voltage Range Leakage Current Input Capacitance DYNAMIC PERFORMANCE Common Mode Rejection Ratio [CMRR] Min 12 ±1 ±1 1 3 1 e t 1 2 1 0.05 0.08 0.07 0.1 Typ Max Unit Bits LSB LSB LSB ppm/oC LSB c o m LSB ppm/oC LSB % % % % Preliminary Technical Data VDD = 7.5 V to 30 V, VSS = 0 V, DVCC = AVCC = VREG, VDRIVE = 2.7 V to 5.25 V, TA = -40oC to 105oC, unless otherwise noted Test Conditions/Comments No Missing Codes w w h e 4 U . 0.1 0.3 0.2 0.5 -40oC to 85oC -40oC to 105oC -40oC to 85oC -40oC to 105oC 1V VCM - VREF 0.5 ±70 15 3 12 2VREF VCM + VREF 27.5 V V V nA pF pF Bits LSB LSB LSB ppm/oC LSB LSB ppm/oC LSB % % % % V nA pF pF dB .


AAT3195 AD7280 AD8597


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)