CS5505/6/7/8 CS5505/6/7/8 Very Lo Very Low Power, 16-bit & 20-bit A/D Convertersw Power, 16-Bit and 20-Bit A/D Converters Features Description The CS5505/6/7/8 are a family of low power CMOS A/D lVery Low Power Consumption converters which are ideal for measuring low-frequency - Single supply +5 V operation: 1.7 mW signals representing physical, chemical, and biological - Dual supply 5 V operation: 3.2 mW processes. lOffers superior performance to VFCs and The CS5507/8 have single-channel diferf ential analog multi-slope integrating ADCs and reference inputs while the CS5505/6 have four lDifferential Inputs pseudo-differential analog input channels. The - Single-channel (CS5507/8) and Four-channel CS5505/7 have a 16-bit output word. The CS5506/8 have a 20-bit outpt wou rd.The CS5505/6/7/8 sample (CS5505/6) pseudo-differential versions upon command up to 100 Sps. lEither 5 V or 3.3 V Digital Interface The on-chip digital filter offers superior line rejection at lLinearity Error: 50 and 60 Hz when the device is operated from a - 0.0015% FS (16-bit CS5505/7) 32.768 kHz clock (output word rate = 20 Sps). - 0.0007% FS (20-bit CS5506/8) The CS5505/6/7/8 incudel on-chip self-calibration cir- lOutput update rates up to 100 Sps cuitry which can be initiated at any time or temperature lFlexible Serial Port to ensure minimum offset and full-scale errors. lPin-Selectable Unipolar/Bipolar Ranges The CS5505/6/7/8 serial port offers two general-purpose modes for the driect interface to shift registers or syn- chronous sriael ports ofnd iustry-standard microcontrollers. ORDERING INFORMATION See page 30. I 9 9 9 *1 9ROWDJH 5HIHUHQFH 95()287 &6 5 < 95() 6HULDO ,QWHUIDFH 95() 6&/. LIIHUHQWLDO /RJLF LJLWDO WK 2UGHU 6 7 ,1 )LOWHU HOWD 6LJPD ,1 0RGXODWRU 08 ,1 ,1 0 6/3 & / ,1 &DOLEUDWLRQ & %3 83 26& &DOLEUDWLRQ 65 0 &219 ,1 287 &6 %,7 1 &6 %,7 6+2:1 Cirrus Logic, Inc. Copyright CirrCopyright us Logic, Inc. 2009 Cirrus Logic, Inc. 1997 Crystal Semiconductor Products Division MOCT 09AR 95 CS5505/6/7/8 CS5505/6/7/8 ANALOG CHARACTERISTICS (T = T to T VA+ = 5V 10% VA- = -5V 10% VD+ = A MIN MAX 3.3V 5% VREF+ = 2.5V(external) VREF- = 0V f = 32.768kHz Bipolar Mode R = 1k with a 10nF CLK source to AGND at AIN Analog input channel AIN1+ AIN- = AGND unless otherwise specified.) (Notes 1, 2) CS5505/7-A CS5507-S Parameter* Min Typ Max Min Typ Max Units Specified Temperature Range -40 to +85 -55 to +125 C Accuracy Linearity Error - 0.0015 0.003 - 0.0015 0.003 %FS Differential Nonlinearity - - LSB 0.25 0.5 0.25 0.5 16 Full Scale Error (Note 3) - - LSB 0.25 2 16 0.5 2 Full Scale Drift (Note 4) - - - - LSB 0.5 2 16 Unipolar Offset (Note 3) - - LSB 0.5 2 1 4 16 Unipolar Offset Drift (Note 4) - - - - LSB 0.5 1 16 Bipolar Offset (Note 3) - - LSB 16 0.25 1 0.5 2 Bipolar Offset Drift (Note 4) - - - - LSB 0.25 0.5 16 Noise (Referred to Output) - 0.16 - - 0.16 - LSB- rms 16 Notes: 1. The AIN pin presents a very high input resistance at dc and a minor dynamic load which scales to the master clock frequency. Both source resistance and shunt capacitance are therefore critical in determining the CS5505/6/7/8s source impedance requirements. For more information refer to the text section Analog Input Impedance Considerations. 2. Specifications guaranteed by design, characterization and/or test. 3. Applies after calibration at the temperature of interest. 4. Total drift over the specified temperature range since calibration at power-up at 25C. Recalibration at any temperature will remove these errors. Unipolar Mode Bipolar Mode mV LSBs % FS ppm FS LSBs % FS ppm FS 10 0.26 0.0004 4 0.13 0.0002 2 19 0.50 0.0008 8 0.26 0.0004 4 38 1.00 0.0015 15 0.50 0.0008 8 76 2.00 0.0030 30 1.00 0.0015 15 152 4.00 0.0061 61 2.00 0.0030 30 VREF = 2.5V CS5505/7 16-Bit Unit Conversion Factors * Refer to the Specification Definitions immediately following the Pin Description Section. Specifications are subject to change without notice. 22 DS59FDS59F77