Overview
The CM2322 is an 18-bit successive approximation analog-to-digital converter (ADC) powered by a single supply. It integrates a low-power, high-speed, 18-bit sampling ADC and a multifunctional serial interface. On the rising edge of the CNV, the CM2322 samples the voltage difference between the IN+ and IN- pins, where the signals on both input pins are typically out of phase, with the voltage swing ranging from 0V to VREF. The reference voltage VREF is provided externally and can be set independently of the supply voltage VDD. Its power consumption increases in direct proportion to the sampling rate.
Using the SPI interface's SDI input pin, multiple ADCs can be connected in a daisy chain configuration, providing an optional busy indicator. The chip is compatible with 1.8V, 2.5V, 3V, and 5V logic through an independent power supply, VIO.
The CM2322 is available in MSOP10 and DFN10 packages, with an optimal operating temperature range of -40°C to 125°C.
Features:
Single supply voltage: 1.8V
Logic interface voltage: 1.8V, 2.5V, 3V, 5V
True differential analog input range: ±VREF
18-bit resolution, no missing codes
Sampling rate: 1MSPS
Performance:
INL: Typical ±1.2LSB (VREF = 5V)
Dynamic range: 99dB (VREF = 5V)
SNR: 97.5dB (fIN = 1kHz, VREF = 5V)
SNDR: 97dB (fIN = 1kHz, VREF = 5V)
THD: -119dB (fIN = 1kHz, VREF = 5V)
Serial interface: SPI/QSPI/MICROWIRE compatible
Can cascade multiple ADCs, providing a busy indicator
No pipeline delay
Low Power Consumption:
3.3mW (1MSPS, VDD only)
5.7mW (1MSPS, total power consumption)
55μW (10kSPS, total power consumption)
Package:
Applications:
Architecture Block Diagram
Pin configuration
Outline and dimensions
CM2322 is packaged in MSOP10 and DFN10.
MSOP10
| 标识 |
尺寸（毫米） |
| 最小值 |
典型值 |
最大值 |
| A |
0.82 |
0.96 |
1.1 |
| A1 |
0.02 |
0.09 |
0.15 |
| A2 |
0.75 |
0.85 |
0.95 |
| b |
0.18 |
0.23 |
0.28 |
| C |
0.09 |
0.16 |
0.23 |
| D |
2.9 |
3 |
3.1 |
| e |
0.50(BSC) |
| E |
4.75 |
4.9 |
5.05 |
| E1 |
2.9 |
3 |
3.1 |
| L |
0.4 |
0.6 |
0.8 |
| θ |
0° |
3° |
6° |
DFN10
| 标识 |
尺寸（毫米） |
| 最小值 |
典型值 |
最大值 |
| A |
0.7 |
0.75 |
0.8 |
| A1 |
0 |
0.03 |
0.05 |
| A2 |
0.20(REF) |
| D |
2.92 |
3 |
3.08 |
| E |
2.92 |
3 |
3.08 |
| D1 |
1.6 |
1.7 |
1.8 |
| E1 |
2.3 |
2.4 |
2.5 |
| b |
0.2 |
0.25 |
0.3 |
| b1 |
0.18(REF) |
| e |
0.50(BSC) |
| k |
0.25(REF) |
| L |
0.32 |
0.4 |
0.48 |
Typical Connection
The following figure shows the recommended connection diagram for CM2322 when using multiple power sources.
For more detailed information, please refer to the data sheet.
EN
