Features: `Chopper Stabilized PGIA (Programmable Gain Instrumentation Amplifier, 1x to 64x) 6 nV/Hz @ 0.1 Hz (No
1/f noise) at 64x 500 pA Input Current with Gains >1
`Delta-Sigma Analog-to-Digital Converter Linearity Error: 0.0007% FS Noise Free Resolution: Up to 23 bits
`Two or Four Channel Differential MUX
`Scalable Input Span via Calibration ±5 mV to differential ±2.5V
`Scalable VREF Input: Up to Analog Supply
`Simple three-wire serial interface
SPI®and Microwire™ Compatible
Schmitt Trigger on Serial Clock (SCLK)
`R/W Calibration Registers Per Channel
`Selectable Word Rates: 6.25 to 3,840 Sps
`Selectable 50 or 60 Hz Rejection
`Power Supply Configurations
VA+ = +5 V; VA- = 0 V; VD+ = +3 V to +5 V
VA+ = +2.5 V; VA- = -2.5 V; VD+ = +3 V to +5 V
VA+ = +3 V; VA- = -3 V; VD+ = +3 VPinout
Specifications
|
Parameter |
SYMBOL |
Min |
Typ |
Max |
UNITS |
DC Power Supplies (Note 21)
Positive Digital
Positive Analog
Negative Analog |
VD+
VA+
VA-
|
-0.3
-0.3
+0.3 |
-
-
- |
+6.0
+6.0
-3.75 |
V
V
V |
| Input Current, Any Pin Except Supplies (Notes 28 and 29) |
IIN |
- |
- |
±10 |
mA |
| Output Current |
IOUT |
- |
- |
±25 |
mA |
| Power Dissipation(Note 30) |
PDN |
- |
- |
500 |
mW |
Analog Input Voltage VREF pins
AIN Pins |
VINR
VINA |
(VA-) -0.3
(VA-) -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: 25. All voltages with respect to ground.
26. VA+ and VA- must satisfy {(VA+) - (VA-)} +6.6 V.
27. VD+ and VA- must satisfy {(VD+) - (VA-)} +7.5 V.
28. Applies to all pins including continuous overvoltage conditions at the analog input (AIN) pins.
29. Transient current of up to 100 mA will not cause SCR latch-up. Maximum input current for a power
supply pin is ±50 mA.
30. 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.
DescriptionThe CS5531/32/33/34 are highly integrated ∆ Analogto- Digital Converters (ADCs) which use charge-balance techniques to achieve 16-bit (CS5531/33) and 24-bit (CS5532/34) performance. The ADCs are optimized for
measuring low-level unipolar or bipolar signals in weigh scale, process control, scientific, and medical applications.
To accommodate these applications, the ADCs come as either two-channel (CS5531/32) or four-channel (CS5533/34) devices and include a very low noise chopper- stabilized instrumentation amplifier (6 nV/Hz @ 0.1 Hz) with selectable gains of 1*, 2*, 4*, 8*, 16*, 32*, and 64*. These ADCs also include a fourth order ∆ modulator followed by a digital filter which provides twenty selectable output word rates of 6.25, 7.5, 12.5, 15, 25, 30, 50, 60, 100, 120, 200, 240, 400, 480, 800, 960, 1600, 1920, 3200, and 3840 Sps (MCLK = 4.9152 MHz).
To ease communication between the ADCs and a microcontroller, the converters CS5534 include a simple three-wire serial interface which is SPI and Microwire compatible with a Schmitt Trigger input on the serial clock (SCLK).
High dynamic range, programmable output rates, and flexible power supply options makes these ADCs ideal
solutions for weigh scale and process control applications.
CS5534 Data Sheet
