Overview
The CM2219 is a 16-bit, 8-channel SAR ADC powered by a single supply.
It integrates all the circuitry required for a low-power, multi-channel data acquisition system, including: a true 16-bit SAR ADC with no missing codes, an 8-channel low crosstalk multiplexer, an internal 4.096V low drift reference voltage source and buffer, a temperature sensor, an optional single-pole filter, and a multi-channel sequencer.
The CM2219 uses the SPI interface for writing configuration registers and receiving conversion results. It employs a separate power supply (VIO) for the SPI interface, and its power consumption is proportional to the sampling rate.
The CM2219 comes in QFN20 and WLCSP20 packages and operates over an optimal temperature range of -40°C to 125°C.
Features
Single power supply: 5V
Logic interface voltage: 1.8V to 5V
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8-channel multiplexer with selectable inputs:
Sampling rate: 500kSPS
INL: Maximum of 2.5 LSB
Dynamic range: 92dB
SNDR: 90.5dB (fIN = 1kHz)
THD: -102dB (fIN = 1kHz)
Analog input range: 0V to VREF (VREF can be as high as VDD)
Serial interface compatible with SPI/QSPI/MICROWIRE/DSP
Multiple reference source types
Internal 4.096V reference source
External buffered reference source (up to 4.096V)
External reference source (up to VDD)
Channel sequencer, optional single-pole filter, busy indicator
No pipeline delay, SAR architecture
Low power consumption: 18mW (500kSPS), 3.5μW (100SPS)
Applications
Architecture Block Diagram
Pin configuration
Application Cases of CM2219 in Industrial and Process Control
CM2219 is widely used in industrial and process control due to its technological advantages of high-speed data transmission speed and high precision.
As the best alternative to AD7689, CM2219 has a high cost performance ratio.
When using applications with multiple power sources, a typical connection circuit diagram is as follows:
When using applications with pseudo bipolar input, the typical connection circuit diagram is as follows:
Solution Overview
The CM2219 is a 16-bit, 8-channel, charge redistribution SAR ADC with a maximum conversion rate of 500kSPS. Between conversions, the chip is in a shutdown state. When using an external reference source and operating at a 100SPS rate, the typical power consumption is 3.5μW.
The CM2219 integrates all the necessary circuitry for a low-power, multi-channel data acquisition system, including:
16-bit true SAR ADC with no missing codes
8-channel, low crosstalk multiplexer
Low drift reference voltage source and buffer
Temperature sensor
Optional single-pole filter
Channel sequencer
The CM2219 uses a serial interface (SPI) for writing configuration registers and receiving conversion results. It uses a separate power supply (VIO) for the SPI interface, and its power consumption is proportional to the sampling rate.
The CM2219 provides an on-chip sample-and-hold circuit for the user with no pipeline delay.
The operating voltage range of the CM2219 is 4.5V to 5.5V, and it can be interfaced with any 1.8V to 5V digital logic interface.
Product list
SAR ADC
| P/N |
Type |
Package |
MPQ(Pcs) |
Benchmarks against |
| CM2248-QFPTR |
ADC |
Tray |
1600 |
AD7606 |
| CM2249-QFPT |
ADC |
Tray |
900 |
AD7616 |
| CM2368-QFPTR |
ADC |
Tray |
1600 |
AD7606C-18 |
| CM2268-QFPTR |
ADC |
Tray |
1600 |
AD7606C-16 |
| CM2219-QFNTR |
ADC |
Tray |
4900 |
AD7699 |
| CM2209-QFNTR |
ADC |
Tray |
4900 |
AD7689 |
| CM2322-MSOTA |
ADC |
Tray |
4000 |
AD7982 |
| CM2220-MSOTA |
ADC |
Reel |
4000 |
AD7980 |
| CM2431-MSOTA |
ADC |
Tray |
4000 |
AD4020 |
| CM2272-MSOTA |
ADC |
Reel |
5000 |
ADS8354 |
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