CS5541

Features:

`∆ Analog-to-Digital Converter
   - Linearity Error: 0.0015% FS
   - RMS Noise: 2 µV
`Two Channel Differential MUX
`Buffered, Fully Differential Analog and Voltage Reference Inputs
`Scalable VREF Input: 0.1 V to Analog Supply
`Absolute Accuracy via Calibration
`Flexible Digital Filters
   - Single Conversion Settling at 13.4 SPS or 4 Conversion Settling at 53.7 SPS with Simultaneous 50/60 Hz Rejection
   - Single Conversion Settling at 64.8 SPS or Four Conversion Settling at 260 SPS with 16-bit Resolution
`Simple 3-Wire Serial Interface
   - SPITM and MicrowireTM Compatible
   - Schmitt Trigger on Serial Clock (SCLK)
`Low Power
   - Single +3.0 V Supply
   - 330 µA Operating; 10 µA Sleep Current


Pinout




Specifications

Parameter	Symbol	Min	Typ	Max	Units
DC Power Supplies (Notes 15 and 16) Positive Digital Positive Analog Negative Analog	VD+ VA+ VA-	-0.3 -0.3 -0.3	- - -	+4.0 +4.0 +0.3	V V V
Input Current, Any Pin Except Supplies (Notes 17 and 18)	IIN	-	-	±10	mA
EmOutput Current	IOUT	-	-	±25	mA
Power Dissipation (Note 19)	PDN	-	-	500	mW
Analog Input Voltage AIN and VREF pins	VINA	(VA-) + (-0.3)	-	(VA+)+0.3	V
Digital Input Voltage	VIND	-0.3	-	(VD+)+0.3	V
Ambient Operating Temperature	TA	-40	-	+85
Storage temperature	Tstg	-65	-	+150

Notes: 14. All voltages measured with respect to digital ground (DGND).
           15. VA+ and VA- must satisfy {(VA+) - (VA-)} +4.0 V.
           16. VD+ and VA- must satisfy {(VD+) - (VA-)} +4.0 V.
           17. Applies to all pins including continuous overvoltage conditions at the analog input (AIN) pins.
           18. Transient currents up to 100 mA will not cause SCR latch-up. Maximum input current for a power supply
                 pin is ±50 mA.
           19. Total power dissipation, including all input currents and output currents.

WARNING: Operation at or beyond these limits may result in permanent damage to the device. Normal operation
                  is not guaranteed at these extremes.


Description

The CS5541 is a 24-bit low-power and low-voltage ∆ analog-to-digital converter (ADC). It is optimized to convert analog signals in DC measurement applications, such as temperature and pressure measurement, and various portable devices where low-power consumption is required.

To accommodate these applications, the ADC integrates analog input and reference buffers for increased input impedance and includes a two-channel multiplexer. Absolute accuracy is achieved via one-time or continuous calibration modes. CS5541 draws less than 330µA.

The CS5541 includes two digital filters. The first filter, which achieves simultaneous rejection of 50/60 Hz, provides single conversion settling at 13.4 SPS throughput or four conversion settling at 53.7 SPS throughput. The second filter, which achieves 16-bit performance, provides single conversion settling at 64.8 SPS throughput or four conversion settling at 260 SPS throughput.

Low-power, low-voltage operation and an easy-to-configure serial interface reduces time-to-market and makes the CS5541 an ideal device for low-cost, power-conscious DC measurement applications.