Description
CS1238 24 bit analog-to-digital ADC converter IC SMD SOP14
General Description
The CS1238 is a 24-bit delta-sigma analog-to-digital converter (ADC) designed for high-precision measurement applications such as weigh scales, industrial process control, and instrumentation. It offers low noise, high resolution, and low power consumption.
⚙️ Key Specifications
| Parameter |
Description |
| Resolution |
24 bits |
| Input Channels |
2 differential or 4 single-ended |
| Input Type |
Differential / Single-ended |
| Interface |
Serial (SPI-like 3-wire or 4-wire interface) |
| Reference Voltage (Vref) |
2.5 V typical (up to 5 V max) |
| Analog Input Range |
±Vref (differential) |
| Conversion Rate |
Programmable: 10 SPS to 1280 SPS |
| Noise-Free Resolution |
Up to 20.5 bits (at 10 SPS) |
| Integral Nonlinearity (INL) |
±10 ppm of FSR typical |
| Power Supply Voltage (VDD) |
2.7 V to 5.5 V |
| Typical Current Consumption |
200 µA (normal mode) |
| Input Impedance |
>10 MΩ |
| Operating Temperature |
–40°C to +85°C |
| Package |
SOP-14 |
| Pin Count |
14 pins |
| Clock Source |
Internal oscillator or external clock input |
🧠 Main Features
-
24-bit delta-sigma ADC with internal digital filter
-
Low noise and high stability for precision measurement
-
Programmable gain and sampling rate
-
Single-supply operation (2.7V–5.5V)
-
Built-in power-on reset and clock circuit
-
SPI-compatible serial data interface
-
Supports both unipolar and bipolar measurement modes
-
Compact SOP-14 package, ideal for SMD PCB designs
⚡ Typical Applications
-
Electronic weighing scales
-
Pressure sensors
-
Temperature measurement systems
-
Industrial instrumentation
-
Data acquisition systems
-
Battery-powered measuring devices
📦 Pin Configuration (SOP-14)
| Pin No. |
Symbol |
Description |
| 1 |
AIN1+ |
Positive input channel 1 |
| 2 |
AIN1- |
Negative input channel 1 |
| 3 |
AIN2+ |
Positive input channel 2 |
| 4 |
AIN2- |
Negative input channel 2 |
| 5 |
VREF+ |
Positive reference input |
| 6 |
VREF- |
Negative reference input |
| 7 |
AGND |
Analog ground |
| 8 |
DGND |
Digital ground |
| 9 |
DVDD |
Digital supply voltage |
| 10 |
SCLK |
Serial clock input |
| 11 |
DOUT |
Serial data output |
| 12 |
CS |
Chip select input |
| 13 |
DRDY |
Data ready output (active low) |
| 14 |
VDD |
Analog power supply |
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