Part A
ADS1243IPWR
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 2763 PCS
- Package
- TSSOP-20
- Series
- 데이터 수집 - 아날로그 변환기(ADC)
Replacement verdict
Not a drop-in replacement
The ADS1243IPWR and ADS1203IPWRG4 are not drop-in replacements for one another. The ADS1243IPWR is a 24-bit delta-sigma ADC with an integrated PGA and SPI interface, while the ADS1203IPWRG4 is a 16-bit isolated delta-sigma modulator with a single-bit output stream. They differ in resolution, output interface, channel architecture, and package pinout, so a direct substitution is not feasible without a full system redesign.
Different output interface
Different resolution
Different channel architecture
Different package pinout
Parts at a glance
Part B
ADS1203IPWRG4
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 4572 PCS
- Package
- TSSOP-8
- Series
- 데이터 수집 - ADC DAC- 전용
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1243IPWR | ADS1203IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Resolution determines the smallest signal change the converter can distinguish; a 24-bit ADC offers far finer measurement granularity than a 16-bit device. |
| Architecture | Delta-Sigma (ADC) | Delta-Sigma Modulator | The ADS1243 is a complete ADC with digital filter and interface, while the ADS1203 is a modulator-only output stage requiring external digital filtering, so they are not drop-in substitutes. |
| Output Interface | SPI (serial) | 1-bit modulator bitstream | The output format dictates how the host processor reads data; SPI delivers finished conversion codes while a bitstream needs an external sinc filter. |
| Number of Input Channels | 8 (single-ended) / 4 (differential) | 1 (differential) | Channel count determines how many signals can be measured without external multiplexing; the ADS1243 supports multi-channel systems directly. |
| Input Type | Differential / single-ended | Differential | Single-ended capability simplifies wiring for ground-referenced sensors, whereas a differential-only input requires balanced signal routing. |
| Supply Voltage | 2.7 V to 5.25 V (analog and digital) | 4.5 V to 5.5 V | Supply range affects compatibility with low-voltage logic and battery-powered designs; the ADS1243 operates down to 2.7 V while the ADS1203 needs a nominal 5 V rail. |
| Package | TSSOP-20 | TSSOP-8 | Package footprint and pin count must match the PCB layout; the two devices are not pin-compatible and require different board designs. |
| Internal PGA | Yes (gain 1 to 128) | No | An internal programmable gain amplifier allows direct connection of low-level sensors without external amplification, simplifying the analog front end. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +105 °C | The temperature range defines the environments in which the part can be reliably used; the ADS1203 supports a wider upper limit for harsher conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1243IPWR | ADS1203IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Type | - | Modulator |
| Number of Channels | - | 1 |
| Resolution(Bits) | - | 16 b |
| Sampling Rate(Per Second) | 15 | 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 | 8 | - |
| Input Type | Differential, Single Ended | - |
| Configuration | MUX-PGA-ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | - |
| Features | PGA | - |
Frequently asked questions
What are the primary functional differences between the ADS1243IPWR and ADS1203IPWRG4?
The ADS1243IPWR is a 24-bit delta-sigma analog-to-digital converter (ADC) with a built-in PGA, designed for direct sensor measurement, while the ADS1203IPWRG4 is a 16-bit delta-sigma modulator that outputs a high-speed 1-bit data stream for isolated or shunt-based current sensing applications. The ADS1243 integrates an on-chip oscillator, reference buffer, and SPI-compatible interface, whereas the ADS1203 requires an external digital filter and clock source.
Are the ADS1243IPWR and ADS1203IPWRG4 pin-compatible?
No. The ADS1243IPWR is supplied in a 20-pin TSSOP package, and the ADS1203IPWRG4 is supplied in a 16-pin TSSOP package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for one another.
What are the resolution and output data rate specifications for each device?
The ADS1243IPWR provides 24-bit resolution with programmable data rates up to 15 SPS in its standard configuration. The ADS1203IPWRG4 is a 16-bit modulator that produces a 1-bit stream at a clock rate up to 10 MHz, with effective resolution determined by the external digital filter and decimation ratio.
Do both devices support the same supply voltage range?
No. The ADS1243IPWR operates from a single analog supply of 2.7 V to 5.25 V and a digital supply of 2.7 V to 5.25 V. The ADS1203IPWRG4 operates from a single 5 V analog supply and a 2.7 V to 5.5 V digital supply. Designers must verify supply compatibility before considering substitution.
Which device is better suited for isolated current-sensing applications?
The ADS1203IPWRG4 is specifically intended for isolated current sensing because its 1-bit modulator output can be transmitted across an isolation barrier to an external digital filter, such as an FPGA or DSP. The ADS1243IPWR is a complete ADC with an SPI interface and is typically used for direct multi-channel sensor measurement rather than isolated modulator-based architectures.
What interface does each device provide to a host controller?
The ADS1243IPWR provides an SPI-compatible serial interface for configuration and data readback. The ADS1203IPWRG4 provides a single-bit modulated data output and a clock input; it does not include a standard serial configuration interface, so the host must implement a digital decimation filter to recover conversion results.
Can the ADS1203IPWRG4 directly replace the ADS1243IPWR in an existing design?
No. The devices differ in package, pinout, resolution, output format, supply requirements, and interface architecture. A direct replacement is not possible without redesigning the PCB, adding an external digital filter and clock source for the ADS1203, and revalidating the signal chain against the target specifications.