CS5505/06/07/08 Low-Power, 16/20-Bit A/D Converters
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CS5505/6/7/8 ^^GRRUSLOGIC Very LowPower, 16-bit & 20-bit A/D Converters Features Very Low Power Consumption - Single supply +5 V opթration: 1.7 mW - Dual supply ±5 V operation: 3.2 mW Offers superior performance to VFCs and multi-slope integrating ADCs Օ Differential Inputs - Single-channel (CS5507/8) and Four-channel (CS5505/6) pseudo-differential versions Either 5 V or 3.3 V Digital Interface Օ Linearity Error: - ±0.0015% FS (16-bit CS5505/7) - ±0.0007% FS (20-bit CS5506/8) Output update rates up to 100 Sps Օ Flexible Serial Port Pin-Selectable Unipolar/Bipolar Ranges Descriptiov The CS5505/6/7/8 are a family of low power CMOS A/D converters which are ideal for measuring low-frequency signals representing physical, chemical, and biological processes. The CS 5507/8 have single-channel differential analog and reference inputs while the CS5505/6 have four pseudo-differential analog input channels. The CS5505/7 have a 16-bit output word. The CS5506/8 have a 20-bit output word.The CS5505/6/7/8 sample upon command up to 100 Sps. The on-chip digital filter offers superior line rejection at 50 and 60 Hz when the device is operated from a 32.768 kHz clock (output word rate = 20 Sps). The CS 5505/6/7/8 include on-chip self-calibration cir-cuitry which can be initiated at any time or temperature to ensure minimum offset and full-scale errors. The CS5505/6/7/8 serial port offers two general-purpose modes for the direct interface to shift registers or syn-chronous serial ports of industry-standard microcontrollers. ORDERING INFORMATION See page 30. VA+ VA- VD+ DGND VREFOUT VREF+ VREF- AIN1 + AIN2+ AIN3+ AIN4+ AIN- pգ Voltage Rשfrence 17 18 20 19 2 CS DRDY SCLK SDATA j4_ Differential 4th-Order Digital Delta-Sigma Filter Modulator 23 Ser al Interface Logic 21 1$_ 9 22 10 MUX 2 3 7 M/SLP CAL BP/UP 11 Calibration uC 4 m. 8 Calibration SRAM OSC 1 24 A0 A1 CONV XIN XOUT cs5505 (16-bit) and cs5506 (20-bit) shown CUeRUS LOGIC Copyright © Cirruo Logih, Inc. 2009 nAR '0Q http://www.cirrus.com (All Rights ReseAeR) T^L09 DS59F7

CS5505/6/7/8 ANALOG CHARACTERISTICS (Ta = tmin to Tmax; va+ = 5V ± 10%; va- = -5V ± 10%; vd+ = 3.3V ± 5%; VREF+ = 2.5V(external); VREF- = 0V; fCLK = 32.768kHz; Bipolar Mode; Rsource = 1 kQ with a 10nF to AGND at AIN; Analog input channel AIN1+; AIN- = AGND; unless otherwise specified.) (Notes 1, 2) Parameter* CS5505/7-A Min Typ Max Units Specified Temperature Range -40 to +85 °C Accuracy Linearity Error Differential Nonlinearity - 0.0015 0.003 - ±0.25 ±0.5 ±%FS LSB16 Full Scale Error (Note 3) - ±0.25 ±2 LSB16 Full Scale Drift (Note 4) - ±0.5 - LSB16 Unipolar Offset (Note 3) - ±0.5 ±2 LSB16...

CS5505/6/7/8 ANALOG CHARACTERISTICS (Ta = tmin to Tmax; va+ = 5 V ± 10%; va- = -5 V ± 10%; vd+ 3.3V ± 5%; VREF+ = 2.5V (external); VREF- = 0V; fCLK = 32.768kHz; Bipolar Mode; Rsource = 1kq with a 10nF to AGND at AIN; Analog input channel AIN1+; AIN- = AGND; unless otherwise specified.) (Notes 1, 2) Parameter* CS5506/8-B Min Typ Max Units Specified Temperature Range -40 to +85 °C Accuracy Linearity Error Differential Nonlinearity (No Missing Codes) - 0.0007 0.0015 20 - - ±%FS Bits Full Scale Error (Note 3) - ±4 ±32 LSB20 Full Scale Drift (Note 4) - ±8 - LSB20 Unipolar Offset (Note 3) - ±8...

CS5505/6/7/8 ANALOG CHARACTERISTICS (Ta = tmin to Tmax; va+ = 5V ± 10%; va- = -5 V ± 10%; vd+ 3.3V ± 5%; VREF+ = 2.5V (external); VREF- = 0V; fCLK = 32.768kHz; Bipolar Mode; Rsource = 1 kQ with a 10nF to AGND at AIN; Analog input channel AIN1+; AIN- = AGND; unless otherwise specified.) (Notes 1, 2) CS5505/7 CS5506/8 Parameter* Min Typ MaxH Units Specified Temperature Range -40 to +85 °C Analog Input Analog Input Range: Unipolar (VAIN+)-(VAIN-) Bi polar (Note 5) 0 to +2.5 ±2.5 Volts Volts Common Mode Rejection: dc 50, 60 Hz (Note 6) - 105 120 - dB dB Off Channel Isolation - 120 dB Input...

CS5505/6/7/8 5V DIGITAL CHARACTERISTICS (Ta = tmin to Tmax; va+vd+ = 5V ± 10%; va-= -5V ± 10%; DGND = 0.) All measurements below are performed under static conditions. (Note 2) Parameter Symbol Min Typ Max Units High-Level Input Voltage: XIN VIH 3.5 - - V M/SLP VIH 0.9VD+ - - V All Pins Except XIN and M/SLP VIH 2.0 - - V Low-Level Input Voltage: XIN Vil - - 1.5 V M/SLP Vil - - 0.1VD+ V All Pins Except XIN and M/SLP Vil - - 0.8 V M/SLP SLEEP Active Threshold (Note 8) Vslp 0.45VD+ 0.5VD+ 0.55VD+ V High-Level Output Voltage (Note 9) Voh (VD+)-1.0 - - V Low Level Output Voltage Iout = 1.6 mA...

CS5505/6/7/8 5V SWITCHING CHARACTERISTICS (TA = TMIN to TMAX; VA+, VD+ = 5V ± 10%; VA- = -5V ± 10%; Input Levels: Logic 0 = 0V, Logic 1 = VD+; Cl = 50 pF.) (Note 2) Parameter Symbol Min Master Clock Frequency: Internal Oscillator: XIN 30.0 External Clock: fclk 30 Master Clock Duty Cycle 40 Rise Times: Any Digital Input Any Digital Output (Note 10) trise - Fall Times: Any Digital Input Any Digital Output (Note 10) tfall - Start-Up Power-On Reset Period (Note 11) tres - Oscillator Start-up Time XTAL=32.768 kHz (Note 12) tosu - Wake-up Period (Note 13) twup - Calibration CONV Pulse Width (CAL...

CS5505/6/7/8 3.3V SWITCHING CHARACTERISTICS (ta = tmin to Tmax va+ = 5V ± 10%; VD+ = 3.3V ± 5%; VA- = -5V ± 10%; Input Levels: Logic 0 = 0V, Logic 1 = VD+ ; CL = 50 pF.) (Note 2) Parameter Symbol Min Typ Max Units Master Clock Frequency: Internal Oscillator: XIN 30.0 32.768 53.0 kHz External Clock: fclk 30 - 163 kHz Master Clock Duty Cycle 40 - 60 % Rise Times: Any Digital Input Any Digital Output (Note 10) trise - 50 1.0 us ns Fall Times: Any Digital Input Any Digital Output (Note 10) tfall - 20 1.0 us ns Start-Up Power-On Reset Period (Note 11) tres - 10 - ms Oscillator Start-up Time...

CS5505/6/7/8 XIN XIN/2 CAL CONV STATE mm. HT mu Standby [t- tscl tcal Standby Calibration Figure 1. Calibration Timing (Not to Scale) XIN XIN/2 A0, A1 CONV DRDY BP/UP STATE tsac tcpw thca tbuh mm 7777777 mm tscn tbus Standby tcon Conversion Standby Figure 2. Conversion Timing (Not to Scale) 8 DS59F7