Overview
The ADS1198CZXGT is a low-power, 8-channel, 16-bit analog front-end (AFE) designed by Texas Instruments. This device is part of the ADS1194/6/8 family and is optimized for scalable medical instrumentation systems. It features high-resolution delta-sigma (ΔΣ) analog-to-digital converters (ADCs), a built-in programmable gain amplifier (PGA), an internal reference, and an onboard oscillator. The ADS1198 is particularly suited for applications requiring simultaneous sampling of multiple channels with high precision and low power consumption.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Number of Channels | 8 | - |
| Resolution | 16 Bits | - |
| Data Rate | 125 SPS to 8 kSPS | SPS |
| Programmable Gain | 1, 2, 3, 4, 6, 8, 12 | - |
| Input-Referred Noise | 12.2 µVPP (Gain = 6, 150Hz BW) | µVPP |
| Input Bias Current | 200 pA | pA |
| Common-Mode Rejection Ratio (CMRR) | -105 dB | dB |
| Analog Supply Voltage | 2.7 V to 5.25 V | V |
| Digital Supply Voltage | 1.65 V to 3.6 V | V |
| Operating Temperature Range | 0°C to +70°C | °C |
| Package Type | 64-ball BGA | - |
Key Features
- Simultaneous sampling of all channels
- Flexible input multiplexer allowing independent connection to internally-generated signals for test, temperature, and lead-off detection
- Built-in right leg drive (RLD) amplifier, lead-off detection, Wilson Center Terminal (WCT), and Goldberger terminals (GCT)
- Programmable gain amplifier (PGA) with gain settings of 1, 2, 3, 4, 6, 8, or 12
- Supports AAMI EC11, EC13, IEC60601-1, IEC60601-2-27, and IEC60601-2-51 standards
- SPI-compatible serial interface
- Flexible power-down and standby modes
- Built-in oscillator and reference
Applications
- Medical instrumentation, including ECG, AED, telemedicine, patient monitoring, Holter, event, stress, and vital signs monitoring
- Evoked audio potential (EAP) and sleep study monitors
- High-precision, simultaneous, multichannel signal acquisition systems
Q & A
- What is the resolution of the ADS1198CZXGT?
The ADS1198CZXGT has a resolution of 16 bits.
- What are the programmable gain settings of the ADS1198CZXGT?
The programmable gain settings are 1, 2, 3, 4, 6, 8, or 12.
- What is the data rate range of the ADS1198CZXGT?
The data rate range is from 125 SPS to 8 kSPS.
- What is the input-referred noise of the ADS1198CZXGT?
The input-referred noise is 12.2 µVPP at a gain of 6 and a bandwidth of 150Hz.
- Does the ADS1198CZXGT support any specific medical standards?
Yes, it supports AAMI EC11, EC13, IEC60601-1, IEC60601-2-27, and IEC60601-2-51 standards.
- What is the operating temperature range of the ADS1198CZXGT?
The operating temperature range is from 0°C to +70°C.
- What type of package is the ADS1198CZXGT available in?
The ADS1198CZXGT is available in a 64-ball BGA package.
- Does the ADS1198CZXGT have built-in lead-off detection?
Yes, it has built-in lead-off detection that can be implemented internally with a pull-up/pull-down resistor or an excitation current sink/source.
- Can multiple ADS1198CZXGT devices be cascaded?
Yes, multiple devices can be cascaded in a daisy-chain configuration for high channel count systems.
- What is the common-mode rejection ratio (CMRR) of the ADS1198CZXGT?
The CMRR is -105 dB.
