CS5509 Single-supply, 16-bit A/D Converter Features Description The CS5509 is a single-supply, 16-bit, serial-output Delta-sigma A/D Converter CMOS A/D converter. The CS5509 uses charge-bal- - 16-bit, No Missing Codes anced (delta-sigma) techniques to provide low-cost, - Linearity Error: 0.0015%FS high-resolution measurements at output word rates up to 200 samples per second. Differential Input The on-chip digital filter offers superior line rejection at 50Hz and 60Hz when the device is operated from a - Pin-selectable Unipolar/Bipolar Ranges 32.768 kHz clock (output word rate = 20 Sps). - Common Mode Rejection 105 dB dc The CS5509 has on-chip self-calibration circuitry which 120 dB 50, 60 Hz can be initiated at any time or temperature to ensure minimum offset and full-scale errors. Either 5V or 3.3V Digital Interface Low power, high resolution, and small package size make the CS5509 an ideal solution for loop-powered On-chip Self-calibration Circuitry transmitters, panel meters, weigh scales, and battery powered instruments. Output Update Rates up to 200/second ORDERING INFORMATION CS5509-ASZ -40 C to +85 C 16-pin SOIC Lead Free Ultra Low Power: 1.7 mW I VREF+ VREF- VA+ GND VD+ 9 10 11 12 13 1 CS 14 Serial SCLK Interface 7 15 AIN+ SDATA Differential Logic 16 4th order Digital DRDY delta-sigma Filter modulator 8 AIN- 3 CAL Calibration C 6 BP/UP Calibration OSC SRAM 2 4 5 CONV XIN XOUT Copyright Cirrus Logic, Inc. 2009 SEP 09 CS5509 ANALOG CHARACTERISTICS (T = 25 C VA+ = 5V 5% VD+ = 3.3V 5% VREF+ = 2.5V, A VREF- = 0V f = 32.768 kHz Bipolar Mode R = 40 with a 10 nF to GND at AIN AIN- = 2.5V unless oth- CLK source erwise specified.) (Notes 1 and 2) Parameter* Min Typ Max Unit Accuracy Linearity Error f = 32.768 kHz CLK - 0.0015 0.003 %FS f = 165 kHz CLK - 0.0015 0.003 %FS f = 247.5 kHz CLK - 0.0015 0.003 %FS f = 330 kHz CLK - 0.005 0.0125 %FS Differential Nonlinearity - 0.25 0.5 LSB Full-scale Error (Note 3) - 0.25 2 LSB Full-scale Drift (Note 4) - 0.5 - LSB Unipolar Offset (Note 3) - 0.5 2 LSB Unipolar Offset Drift (Note 4) - 0.5 - LSB Bipolar Offset (Note 3) - 0.25 1 LSB Bipolar Offset Drift (Note 4) - 0.25 - LSB LSB Noise (Referred to Output) - 0.16 - rms Analog Input Analog Input Range Unipolar - 0 to +2.5 - V Bipolar (Notes 5 and 6) - 2.5 - V Common Mode Rejection dc - 105 - dB f = 32.768 kHz 50, 60 Hz (Note 2) 120 - - dB CLK Input Capacitance - 15 - pF DC Bias Current (Note 1) - 5 - nA Power Supplies DC Power Supply Currents I Total - 350 450 A I Analog - 300 - A I - 60 - A Digital Power Dissipation (Note 7) - 1.7 2.25 mW Power Supply Rejection - 80 - dB Notes: 1. Both source resistance and shunt capacitance are critical in determining the CS5509 s source impedance requirements. 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 25 C. 5. The input is differential. Therefore, GND Signal + Common Mode Voltage VA+. 6. The CS5509 can accept input voltages up to the VA+ analog supply. In unipolar mode the CS5509 will output all 1 s if the dc input magnitude ((AIN+) - (AIN-)) exceeds ((VREF+) - (VREF-)) and will output all 0 s if the input becomes more negative than 0 Volts. In bipolar mode the CS5509 will output all 1 s if the dc input magnitude ((AIN+) - (AIN-)) exceeds ((VREF+) - (VREF-)) and will output all 0 s if the input becomes more negative in magnitude than -((VREF+) - (VREF-)). 7. All outputs unloaded. All inputs CMOS levels. * Refer to the Specification Definitions immediately following the Pin Description Section. 2 DS125F3