Part A
ADS1230IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 7361 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1230IPWR and ADS1208IPWRG4 are not drop-in replacements for one another. Although both are 16-bit delta-sigma analog-to-digital converters in a TSSOP-16 package, they differ fundamentally in resolution architecture, input signal path, output interface, and target application, so a direct board-level substitution is not feasible without redesign.
Different input architecture
Different output interface
Different data rate
Different application focus
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 | ADS1230IPWR | ADS1208IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 20 | 16 | Resolution determines the smallest signal change the ADC can distinguish; a 20-bit converter offers finer measurement granularity than a 16-bit one. |
| Architecture | Delta-Sigma (low-speed, high-resolution) | Delta-Sigma modulator (current-shunt oriented) | The converter architecture dictates noise shaping, filtering needs, and the type of signal chain (e.g., direct bridge sensing vs. isolated current measurement) the part suits. |
| Input type / signal domain | Differential analog voltage input (bridge sensor) | Differential analog input optimized for shunt/current sensing | The intended input domain determines whether the device can directly interface with a load cell/bridge or a current-shunt without additional conditioning. |
| Output interface | Serial (SPI-compatible) digital output | Digital bit-stream / serial output | The output format must match the host microcontroller or DSP interface; incompatible output protocols prevent direct substitution. |
| Supply voltage (V) | 2.7 to 5.5 | 4.5 to 5.5 | Supply range affects compatibility with the system rail; a narrower range may not operate on lower-voltage rails used by the other part. |
| Package | TSSOP-16 | TSSOP-16 | Package footprint and pinout determine PCB layout compatibility; identical packages ease board-level substitution but pin functions must still be verified. |
| Typical application focus | Weigh scales, strain gauges, pressure sensors | Motor control, current sensing, power monitoring | Application focus indicates the optimized noise/bandwidth trade-off and whether the part is functionally suited to the target measurement task. |
| Data rate / output speed | Low-speed (tens of SPS, gain-dependent) | Higher-speed modulator bit-stream (kHz-range) | Output data rate must match the required measurement bandwidth; a slow high-resolution converter cannot substitute for a fast modulator in dynamic control loops. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1230IPWR | ADS1208IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| 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 ADS1230IPWR and ADS1208IPWRG4?
The ADS1230IPWR is a 20-bit delta-sigma analog-to-digital converter designed primarily for weigh scales and strain gauge applications, featuring an integrated low-noise PGA with gains of 1, 2, 64, and 128. The ADS1208IPWRG4 is a 16-bit delta-sigma modulator intended for isolated signal acquisition and current sensing, providing a single-bit or multi-bit modulator output stream rather than a fully integrated ADC with digital filter. They serve different signal-chain roles and are not functionally interchangeable.
Do the ADS1230IPWR and ADS1208IPWRG4 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 ADS1230IPWR provides a complete ADC with on-chip oscillator, PGA, and serial data output, while the ADS1208IPWRG4 provides a modulator output (MDAT) and clock interface. Pin assignments and external component requirements are not identical, so PCB layouts cannot be shared without verification against both datasheets.
What are the resolution and data rate specifications for each device?
The ADS1230IPWR provides 20-bit resolution with a selectable output data rate of 10 SPS or 80 SPS. The ADS1208IPWRG4 is a 16-bit second-order delta-sigma modulator with a clock input up to 20 MHz, producing a modulated bitstream that is decimated externally; its effective resolution and output word rate depend on the external digital filter and clock frequency selected by the system designer.
Can the ADS1230IPWR and ADS1208IPWRG4 operate from the same supply voltage?
The ADS1230IPWR operates from a single analog supply of 2.7 V to 5.3 V. The ADS1208IPWRG4 operates from a 5 V analog supply (4.5 V to 5.5 V) with a separate digital supply of 2.7 V to 5.5 V. While both can operate with a 5 V analog rail, the ADS1230IPWR supports lower analog supply voltages that the ADS1208IPWRG4 does not, so supply compatibility must be evaluated per design.
Which device is better suited for isolated current sensing or shunt-based measurement?
The ADS1208IPWRG4 is specifically intended for isolated signal acquisition and current sensing, as its modulator output can be passed through a digital isolator to a controller, maintaining galvanic isolation. The ADS1230IPWR integrates a PGA and digital filter for direct low-frequency sensor measurement such as weigh scales, but it does not provide an isolated modulator interface, making the ADS1208IPWRG4 the appropriate choice for isolation-oriented current-sense architectures.
Are the ADS1230IPWR and ADS1208IPWRG4 drop-in replacements for one another?
No. Although both are TSSOP-16 delta-sigma devices from Texas Instruments, they differ in resolution (20-bit ADC versus 16-bit modulator), output interface (serial ADC data versus modulator bitstream), supply requirements, and internal signal chain. A direct substitution is not supported; any replacement requires redesign of the digital interface, filtering, and supply circuitry, validated against the respective datasheets.
What digital interface does each device provide to a host microcontroller?
The ADS1230IPWR provides a two-wire serial interface with a data-ready signal (DRDY/DOUT) and serial clock (SCLK), outputting converted 20-bit results directly. The ADS1208IPWRG4 outputs a modulated data stream (MDAT) synchronized to an external clock (MCLK), requiring the host or an external digital filter to decimate the bitstream into a usable conversion result. The interface architectures are fundamentally different.