Part A
ADS1222IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 3095 PCS
- Package
- TSSOP-14
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1222IPWR and ADS1208IPWRG4 are not drop-in replacements for one another. The ADS1222IPWR is a 24-bit delta-sigma ADC with an SPI-compatible serial interface, while the ADS1208IPWRG4 is a 16-bit second-order delta-sigma modulator with a single-bit output stream. They differ in resolution, output interface, package footprint, and functional architecture, so substituting one for the other requires a full redesign of the surrounding signal chain and digital interface.
Different output interface
Different resolution
Different package footprint
Different converter architecture
Parts at a glance
Part B
ADS1208IPWRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4872 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - ADC DAC - dédié
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1222IPWR | ADS1208IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Resolution determines the smallest signal change the ADC can distinguish; a 24-bit device offers far finer measurement granularity than a 16-bit device. |
| Architecture | Delta-Sigma | Delta-Sigma | Both use delta-sigma modulation, which provides high resolution and low noise for precision sensing applications. |
| Number of input channels | 2 (differential) | 1 (differential) | Channel count affects how many signals can be measured; the ADS1222 supports two differential inputs while the ADS1208 supports one. |
| Output interface | SPI (serial) | Serial (modulator bitstream) | The interface determines how the ADC connects to a host; the ADS1222 provides a standard SPI digital output, while the ADS1208 outputs a modulator bitstream requiring external filtering. |
| Supply voltage (V) | 2.7 to 5.5 | 4.5 to 5.5 | Supply range affects compatibility with system power rails; the ADS1222 operates over a wider low-voltage range, while the ADS1208 requires a nominal 5 V supply. |
| Package | TSSOP-16 | TSSOP-16 | Package footprint affects PCB layout and drop-in compatibility; both share the same TSSOP-16 footprint. |
| Operating temperature range (°C) | -40 to 85 | -40 to 85 | The temperature range indicates environmental robustness; both are rated for industrial temperature operation. |
| Typical application focus | Precision sensor measurement (temperature, pressure, weigh scales) | Motor control and current sensing (modulator for isolated measurement) | Application focus reflects the intended signal chain; the ADS1222 targets precision low-speed sensing, while the ADS1208 targets motor/current sensing with isolated modulator interfaces. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1222IPWR | ADS1208IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Type | - | Modulator |
| Number of Channels | - | 1 |
| Resolution(Bits) | - | 16 b |
| Sampling Rate(Per Second) | 240 | 40k |
| Data Interface | SPI | Serial |
| Voltage Supply Source | - | Analog and Digital |
| Voltage - Supply | - | 2.7V ~ 5.5V, 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
| Number of Bits | 24 | - |
| Number of Inputs | 2 | - |
| Input Type | Differential, Single Ended | - |
| Configuration | MUX-ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | - |
| Features | Temperature Sensor | - |
Frequently asked questions
Are the ADS1222IPWR and ADS1208IPWRG4 functionally interchangeable?
No. The ADS1222IPWR is a 24-bit delta-sigma ADC with a two-channel differential input multiplexer, while the ADS1208IPWRG4 is a 16-bit second-order delta-sigma modulator with a single differential input. They differ in resolution, input architecture, and output interface, so they are not direct substitutes.
What are the resolution and output format differences between the ADS1222IPWR and ADS1208IPWRG4?
The ADS1222IPWR provides 24-bit resolution and outputs parallel data through its digital interface. The ADS1208IPWRG4 is a 16-bit modulator that outputs a 1-bit delta-sigma bitstream, which must be processed by an external digital filter or controller.
Do the ADS1222IPWR and ADS1208IPWRG4 use the same package and pinout?
Both devices are offered in a TSSOP package, but they are not pin-compatible. The ADS1222IPWR is a complete ADC with multiplexer and control pins, whereas the ADS1208IPWRG4 is a modulator with a different pin function assignment, so PCB layouts cannot be shared without redesign.
Which device is better suited for isolated current-sensing or shunt-based measurement?
The ADS1208IPWRG4 is intended for isolated signal-chain applications, such as current sensing with shunts, because its 1-bit modulator output can be galvanically isolated and processed by a digital filter. The ADS1222IPWR is a general-purpose ADC and does not provide the same modulator-output architecture for isolation.
What are the supply voltage requirements for the ADS1222IPWR and ADS1208IPWRG4?
The ADS1222IPWR operates from a single 2.7 V to 5.5 V analog supply. The ADS1208IPWRG4 operates from a 4.5 V to 5.5 V analog supply. Designs must verify the supply rail against the respective datasheet before substitution.
Can the ADS1208IPWRG4 replace the ADS1222IPWR in an existing ADC socket?
No. The ADS1208IPWRG4 does not provide a parallel digital output or an integrated input multiplexer like the ADS1222IPWR. Replacing one with the other requires changes to the digital interface, filtering, and possibly the analog front end, so a direct socket replacement is not supported.
Which device offers higher effective resolution for low-frequency sensor measurements?
The ADS1222IPWR offers 24-bit resolution and is designed for low-frequency precision measurement with its delta-sigma ADC architecture. The ADS1208IPWRG4 provides 16-bit modulator resolution, so the ADS1222IPWR is the higher-resolution option for direct ADC conversion.