Part A
ADS1230IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2859 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1230IPW and ADS1208IPWR are not drop-in replacements for one another. Although both are delta-sigma analog-to-digital converters, they differ fundamentally in resolution, output interface, package footprint, and target application, so substituting one for the other requires a full redesign of the signal chain, digital interface, and board layout rather than a direct swap.
Different resolution
Different output interface
Different package footprint
Different application focus
Parts at a glance
Part B
ADS1208IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 7626 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 | ADS1230IPW | ADS1208IPWR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 20 | 16 | Higher resolution enables finer measurement of small signal changes, which is critical for precision sensor and weigh-scale applications. |
| Architecture | Delta-Sigma (low-speed, high-resolution) | Delta-Sigma modulator (current-shunt) | The converter architecture determines the type of input signal handled and the digital output format, affecting direct substitutability. |
| Input type | Differential (bridge/sensor) | Differential (current-shunt / isolated) | Matching the input topology to the sensor or shunt configuration is essential for correct signal acquisition. |
| Output interface | Serial (SPI-compatible, 2-wire) | Serial bit-stream (modulator output) | The digital output format must match the host controller or digital filter; a bit-stream modulator output requires an external sinc filter. |
| Data rate / output rate | 10 SPS or 80 SPS (selectable) | Up to 40 kSPS (modulator clock dependent) | Output rate determines measurement bandwidth and noise trade-off; the two parts target very different speed regimes. |
| Supply voltage | 2.7 V to 5.3 V | 4.5 V to 5.5 V | Supply range must be compatible with the system rail; the narrower range of the ADS1208 limits low-voltage operation. |
| Package | 16-pin TSSOP | 16-pin TSSOP | Package footprint affects PCB layout and drop-in compatibility; identical packages simplify board rework. |
| Internal PGA / gain | Fixed gain of 128 | No integrated PGA (external gain) | On-chip gain simplifies small-signal front ends; absence of a PGA requires external amplification for low-level signals. |
| Typical application | Weigh scales, strain gauges, pressure sensors | Motor control, current sensing, isolated measurement | Intended application indicates the signal chain and system context, guiding whether the parts are functionally interchangeable. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1230IPW | ADS1208IPWR |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Type | - | Modulator |
| Number of Channels | - | 1 |
| Resolution(Bits) | - | 16 b |
| Sampling Rate(Per Second) | 80 | 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 | 20 | - |
| Number of Inputs | 1 | - |
| Input Type | Differential, Single Ended | - |
| Configuration | PGA-ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.7V ~ 5.3V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.3V | - |
| Features | PGA | - |
Frequently asked questions
What are the primary functional differences between the ADS1230IPW and ADS1208IPWR?
The ADS1230IPW is a 20-bit delta-sigma analog-to-digital converter (ADC) designed for bridge sensor applications, integrating a low-noise programmable gain amplifier (PGA) with gains of 1, 2, 64, and 128. The ADS1208IPWR is a 16-bit delta-sigma modulator with a ±256 mV input range and an integrated driver, intended for isolated current sensing and industrial applications. The ADS1230 provides a complete ADC signal chain with digital filter and serial interface, while the ADS1208 outputs a modulated bitstream requiring external digital filtering.
Are the ADS1230IPW and ADS1208IPWR pin-compatible or package-compatible?
No. The ADS1230IPW is supplied in a 16-pin TSSOP (PW) package, while the ADS1208IPWR is supplied in a 16-pin TSSOP (PW) package as well, but the pin functions and internal architecture differ significantly. The two devices are not pin-compatible and cannot be interchanged on the same PCB without redesign.
What are the resolution and data rate specifications for each device?
The ADS1230IPW offers 20-bit resolution with a data rate of 10 SPS or 80 SPS (selectable). The ADS1208IPWR is a 16-bit delta-sigma modulator with a typical clock frequency of 10 MHz and an output data rate determined by the external digital filter, typically in the range of 10 kSPS to 40 kSPS depending on filter configuration.
Which device is better suited for weigh scale and bridge sensor applications?
The ADS1230IPW is specifically designed for weigh scale and bridge sensor applications, featuring an integrated PGA with gain up to 128, low noise, and a complete ADC with on-chip digital filter. The ADS1208IPWR is a modulator intended for isolated current sensing and does not include an integrated PGA or digital filter, making it less suitable for direct bridge sensor interfacing without additional signal conditioning.
What are the supply voltage and power consumption characteristics of each part?
The ADS1230IPW operates from a single 2.7 V to 5.3 V supply with typical power consumption of approximately 1.5 mW at 3 V. The ADS1208IPWR operates from a 5 V analog supply and a 3 V to 5 V digital supply, with power consumption typically around 25 mW. The ADS1230 is optimized for low-power, battery-operated sensor applications, while the ADS1208 is intended for higher-speed industrial systems.
Can the ADS1208IPWR replace the ADS1230IPW in an existing design?
No. The ADS1208IPWR cannot directly replace the ADS1230IPW because it lacks an integrated PGA and digital filter, has a different output format (modulated bitstream vs. serial digital word), and requires external digital filtering and signal conditioning. A redesign of the signal chain and PCB layout would be required.
What are the typical interface and output formats of these two converters?
The ADS1230IPW provides a serial interface compatible with SPI, outputting 20-bit conversion results as a digital word. The ADS1208IPWR outputs a 1-bit delta-sigma modulated bitstream at a clock rate of up to 10 MHz, which must be processed by an external digital filter (e.g., sinc filter) to obtain a 16-bit conversion result.