Part A
ADS1246IPWR
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 2336 個数
- Package
- TSSOP-16
- 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 ADS1246IPWR and ADS1203IPWRG4 are not drop-in replacements for one another. The ADS1246IPWR 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 Manchester-encoded output. They differ in resolution, output interface, isolation, and package pinout, so a direct substitution is not possible without a full system redesign.
Different output interface
Different resolution
Different isolation
Different pinout
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 | ADS1246IPWR | ADS1203IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Resolution determines the smallest signal change the converter can distinguish; a 24-bit delta-sigma ADC offers far finer measurement granularity than a 16-bit device. |
| Architecture / Output Type | Delta-sigma ADC with digital (SPI) output | Delta-sigma modulator with 1-bit bitstream output | The ADS1246 delivers fully decimated digital codes over SPI, while the ADS1203 outputs a raw 1-bit modulator stream requiring external digital filtering, so they are not drop-in substitutes. |
| Input Channels | 1 differential (2 single-ended) | 1 differential | Channel count affects how many signals can be measured without external multiplexing; the ADS1246 supports an extra single-ended input configuration. |
| Interface | SPI (serial peripheral interface) | Digital bitstream (no standard serial bus) | Interface compatibility determines whether the part can connect directly to a host microcontroller; the ADS1203 requires a dedicated digital filter or SINC filter peripheral. |
| Supply Voltage (analog) | 2.7 V to 5.25 V | 4.5 V to 5.5 V | Supply range affects compatibility with low-voltage systems; the ADS1246 operates down to 2.7 V while the ADS1203 requires a nominal 5 V rail. |
| Package | TSSOP-16 | TSSOP-16 | Package footprint determines PCB layout compatibility; both share the same TSSOP-16 footprint, easing board-level substitution. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +85 °C | Temperature range affects suitability for harsh environments; the ADS1246 offers a wider upper limit for industrial applications. |
| Data Rate / Output Word Rate | Up to 2 kSPS (programmable) | Up to 40 kSPS (modulator clock dependent) | Output rate determines measurement throughput; the ADS1203 modulator can support higher raw sampling rates when paired with an appropriate external digital filter. |
| Internal PGA / Gain | Yes, programmable gain amplifier (1 to 128) | No internal PGA | An internal PGA allows direct connection of low-level sensors without external amplification; the ADS1203 lacks this, requiring external signal conditioning. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1246IPWR | ADS1203IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Type | - | Modulator |
| Number of Channels | - | 1 |
| Resolution(Bits) | - | 16 b |
| Sampling Rate(Per Second) | 2k | 40k |
| Data Interface | SPI | Serial |
| Voltage Supply Source | - | Single Supply |
| Voltage - Supply | - | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
| Mounting Type | - | Surface Mount |
| Number of Bits | 24 | - |
| Number of Inputs | 1 | - |
| 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, Temperature Sensor | - |
Frequently asked questions
What are the primary functional differences between the ADS1246IPWR and ADS1203IPWRG4?
The ADS1246IPWR is a 24-bit delta-sigma analog-to-digital converter (ADC) with a built-in programmable gain amplifier (PGA) and SPI interface, designed for precision sensor measurement. The ADS1203IPWRG4 is a 16-bit delta-sigma modulator that outputs a 1-bit data stream for isolated signal conditioning, typically paired with an external digital filter or FPGA. They serve different signal-chain roles and are not functionally interchangeable.
Do the ADS1246IPWR and ADS1203IPWRG4 have compatible package and pinout configurations?
Both devices are offered in a TSSOP-16 package (PW suffix), but their pin functions and internal architectures differ. The ADS1246IPWR integrates an ADC with PGA and SPI, while the ADS1203IPWRG4 provides a modulator output (MDAT/MCLK). Pin assignments and external component requirements are not equivalent, so PCB layouts cannot be directly reused without redesign.
What are the resolution and output data format differences between these two devices?
The ADS1246IPWR provides 24-bit resolution with a serial SPI output of converted digital codes. The ADS1203IPWRG4 is a 16-bit delta-sigma modulator that outputs a 1-bit oversampled data stream, requiring an external digital filter to reconstruct the 16-bit result. The output formats and system-level processing requirements are fundamentally different.
Can the ADS1203IPWRG4 be used as a drop-in replacement for the ADS1246IPWR in an existing design?
No. The ADS1203IPWRG4 lacks the integrated PGA, SPI interface, and on-chip digital filter of the ADS1246IPWR. It requires an external modulator clock and digital filter to produce usable data. A direct substitution would require significant redesign of the signal chain, clocking, and digital interface.
What are the typical application areas for each device?
The ADS1246IPWR is suited for precision sensor measurement such as temperature, pressure, and weigh-scale applications requiring high-resolution ADC with PGA. The ADS1203IPWRG4 is typically used in isolated current sensing, motor control, and power monitoring where a modulator output is galvanically isolated and processed by an external filter or controller.
Do both devices support the same supply voltage ranges?
Both devices operate from a single 5 V analog supply (AVDD) with a digital supply (DVDD) in the 2.7 V to 5.25 V range, per their respective datasheets. However, the ADS1246IPWR includes an internal PGA and reference circuitry with specific supply and reference requirements, while the ADS1203IPWRG4 modulator has different input and clocking constraints. Designers must verify supply and reference conditions against each datasheet.
Which device is better suited for isolated signal acquisition?
The ADS1203IPWRG4 is specifically designed for isolated signal acquisition because its 1-bit modulator output can be transmitted across an isolation barrier and reconstructed by a digital filter on the isolated or non-isolated side. The ADS1246IPWR, with its SPI interface and integrated ADC, is not intended for direct isolation-barrier applications without additional isolation components.