Part A
ADS1222IPWR
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 3095 個数
- Package
- TSSOP-14
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1222IPWR and ADS1203IPWRG4 are not drop-in replacements for one another. Although both are 24-bit delta-sigma analog-to-digital converters in TSSOP packages, they differ fundamentally in resolution architecture, output interface, channel configuration, and modulator clock requirements, so a direct board-level substitution is not feasible without redesign.
Different output interface
Different channel configuration
Different modulator clock scheme
Different conversion architecture
Parts at a glance
Part B
ADS1203IPWRG4
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 4572 個数
- Package
- TSSOP-8
- Series
- データ取得 - ADC/DAC - 特殊用途向け
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 | ADS1203IPWRG4 | 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 (24-bit ADC) | Delta-Sigma modulator | The ADS1222 is a complete ADC with digital filter and interface, while the ADS1203 is a modulator-only device requiring external digital filtering, affecting system design and substitutability. |
| Output Interface | SPI (serial) | 1-bit modulator bitstream | The output format dictates how the host processor receives data; SPI provides ready-to-use conversion results, whereas a bitstream requires an external sinc filter. |
| Input Channels | 2 differential | 1 differential | Channel count determines how many signals can be measured; the ADS1222 supports two differential inputs while the ADS1203 supports only one. |
| Supply Voltage (analog) | 2.7 V to 5.5 V | 4.5 V to 5.5 V | The wider supply range of the ADS1222 allows operation at lower voltages, while the ADS1203 requires a nominal 5 V supply, affecting power-supply compatibility. |
| Package | TSSOP-16 | TSSOP-16 | Package footprint affects PCB layout and drop-in compatibility; both share the same TSSOP-16 footprint, easing board-level substitution. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range defines the environments in which the device can reliably operate; identical ranges mean equivalent environmental robustness. |
| Data Rate / Modulator Clock | Up to 2 kSPS (programmable) | Up to 10 MHz modulator clock | Throughput and clocking scheme differ significantly; the ADS1222 offers programmable output data rates while the ADS1203 relies on an external modulator clock, impacting system timing design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1222IPWR | ADS1203IPWRG4 |
|---|---|---|
| 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 | - | Single Supply |
| Voltage - Supply | - | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°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
What are the primary functional differences between the ADS1222IPWR and ADS1203IPWRG4?
The ADS1222IPWR is a 24-bit delta-sigma analog-to-digital converter with a two-channel differential input multiplexer, internal oscillator, and a programmable gain amplifier, housed in a TSSOP-16 package. The ADS1203IPWRG4 is a 16-bit delta-sigma modulator with a single differential input, designed for isolated signal acquisition when paired with an external digital filter, and is supplied in a TSSOP-8 package. The ADS1222 integrates a full ADC with digital filter, while the ADS1203 outputs a 1-bit modulator stream requiring external processing.
Are the ADS1222IPWR and ADS1203IPWRG4 pin-compatible or package-compatible?
No. The ADS1222IPWR uses a TSSOP-16 package, whereas the ADS1203IPWRG4 uses a smaller TSSOP-8 package. The pin counts, pin functions, and PCB land patterns differ, so these devices are not drop-in replacements for each other.
What are the resolution and output data format differences between the two devices?
The ADS1222IPWR provides 24-bit resolution and outputs fully processed digital codes via its serial interface after internal digital filtering. The ADS1203IPWRG4 is a 16-bit delta-sigma modulator that outputs a 1-bit serial bitstream at a high oversampling rate; the effective 16-bit resolution is achieved only after external digital filtering (e.g., in an FPGA or DSP).
Do both devices support the same supply voltage range?
Both devices operate from a single 5 V analog supply (AVDD = 5 V typical) with a separate digital supply (DVDD) that supports 2.7 V to 5.5 V logic interfaces, per their respective manufacturer datasheets. Designers should verify the exact recommended operating conditions in the latest datasheet revision before finalizing the supply design.
Which device is better suited for isolated current-sense or shunt-based measurement applications?
The ADS1203IPWRG4 is specifically intended for isolated signal acquisition: its modulator output can be routed across an isolation barrier to a digital filter, making it suitable for isolated shunt-based current sensing in motor drives and power inverters. The ADS1222IPWR integrates the digital filter and is better suited for non-isolated, general-purpose precision sensor measurement where a complete ADC solution is desired.
Can the ADS1203IPWRG4 be used as a direct substitute for the ADS1222IPWR in an existing design?
No. Beyond the package and pin-count differences, the ADS1203IPWRG4 requires an external digital filter to produce usable conversion results, whereas the ADS1222IPWR delivers filtered digital output directly. Substitution would require redesign of the signal chain, PCB layout, and firmware, and must be validated against the manufacturer datasheets.
What are the input channel configurations of each device?
The ADS1222IPWR features a two-channel differential input multiplexer, allowing selection between two differential input pairs. The ADS1203IPWRG4 has a single differential input pair. Designs requiring multiple input channels should account for this difference when selecting between the two parts.