CS5521

Features:

·Low Input Current (100 pA), Chopper Stabilized Instrumentation Amplifier
·Scalable Input Span (Bipolar/Unipolar)
   - 2.5V V_REF: 25 mV, 55 mV, 100 mV, 1 V, 2.5 V, 5 V
   - External: 10 V, 100 V
·Wide VREF Input Range (+1 to +5 V)
·Fourth Order Delta-Sigma A/D Converter
·Easy to Use Three-wire Serial Interface Port
   - Programmable/Auto Channel Sequencer with Conversion Data FIFO
   - Accessible Calibration Registers per Channel
   - Compatible with SPI^TM and Microwire^TM
·System and Self-Calibration
·Eight Selectable Word Rates
   - Up to 617 Hz (XIN = 200 kHz)
   - Single Conversion Settling
   - 50/60 Hz ±3 Hz Simultaneous Rejection
·Single +5 V Power Supply Operation
   - Charge Pump Drive for Negative Supply
   - +3 to +5 V Digital Supply Operation
·Low Power Consumption: 5.5 mW


Pinout




Specifications

Parameter	SYMBOL	Min	Typ	Max	UNITS
DC Power Supplies (Note 21) Positive Digital Positive Analog	VD+ VA+	-0.3 -0.3	- -	+6.0 +6.0	V V
Negative Bias Voltage Negative Potential	NBV	+0.3	-2.1	-3.0	V
Input Current, Any Pin Except Supplies (Note 22 and 23)	IIN	-	-	±10	mA
Output Current	IOUT	-	-	±25	mA
Power Dissipation (Note 24)	PDN	-	-	500	mW
Analog Input Voltage VREF pins AIN Pins	VINR VINA	NBV -0.3 NBV -0.3	- -	(VA+) + 0.3 (VA+) + 0.3	V V
Digital Input Voltage	VIND	-0.3	-	(VD+) + 0.3	V
Ambient Operating Temperature	TA	-40	-	85
Storage Temperature	Tstg	-65	-	150

Notes: 21. No pin should go more negative than NBV - 0.3 V.
           22. Applies to all pins including continuous overvoltage conditions at the analog input (AIN) pins.
           23. Transient current of up to 100 mA will not cause SCR latch-up. Maximum input current for a power
                 supply pin is ±50 mA.
           24. 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 CS5521/22/23/24/28 are highly integrated Analog- to-Digital Converters (ADCs) which use chargebalance
techniques to achieve 16-bit (CS5521/23) and 24-bit (CS5522/24/28) performance. The ADCs come as either two-channel (CS5521/22), four-channel (CS5523/24), or eight-channel (CS5528) devices, and include a low input current, chopper-stabilized instrumentation amplifier. To permit selectable input spans of 25 mV, 55 mV, 100 mV, 1 V, 2.5 V, and 5 V, the ADCs include a PGA (programmable gain amplifier). To accommodate ground-based thermocouple applications, the devices include a Charge Pump Drive which provides a negative bias voltage to the on-chip amplifiers.

CS5521 also include a fourth order modulator followed by a digital filter which provides eight selectable output word rates. The digital filters are designed to settle to full accuracy within one conversion cycle and when
operated at word rates below 30 Hz, they reject both 50 and 60 Hz interference.

These single supply products CS5521 are ideal solutions for measuring isolated and non-isolated, low-level signals in process control applications.