Part A
ADS1282IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 4636 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1282IPW and ADS1208IPWR are not drop-in replacements for one another. The ADS1282IPW is a high-resolution 31-bit delta-sigma ADC with an integrated PGA and dual-channel input, while the ADS1208IPWR is a 16-bit second-order delta-sigma modulator with a single-ended input and a digital modulator output. Their resolution, output interface, channel configuration, and package footprint differ fundamentally, so substituting one for the other requires a complete redesign of the signal chain, digital interface, and board layout.
Different output type
Different resolution
Different channel count
Different package footprint
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 | ADS1282IPW | ADS1208IPWR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 31 | 16 | Resolution determines the smallest signal change the ADC can distinguish; a 31-bit delta-sigma converter offers far finer measurement precision than a 16-bit device. |
| Architecture | Delta-sigma (2nd order) | Delta-sigma (2nd order) | Both use delta-sigma modulation, but the ADS1282 is a high-resolution seismic-grade converter while the ADS1208 is a lower-resolution isolated-modulator-oriented device, affecting noise and linearity performance. |
| Number of input channels | 2 (differential) | 1 (differential) | Channel count determines how many independent signals can be digitized; the ADS1282 supports two differential inputs while the ADS1208 supports one. |
| Data rate / output rate | Up to 4 kSPS | Up to 40 kSPS | Maximum output data rate sets the achievable sampling bandwidth; the ADS1208 can sample faster but at lower resolution, while the ADS1282 trades speed for precision. |
| Interface | SPI (serial) | Serial (modulator output) | The digital interface must match the host controller; the ADS1282 provides a standard SPI interface, whereas the ADS1208 outputs a modulator bitstream requiring external filtering. |
| Supply voltage | 5 V (analog), 1.8–3.3 V (digital) | 5 V (analog), 3.0–5.5 V (digital) | Supply requirements affect system power design and level compatibility; the two parts have different digital supply ranges, impacting direct board-level substitution. |
| Package | TSSOP-28 | TSSOP-16 | Package footprint and pin count must match the PCB layout; different packages mean the parts are not drop-in replacements. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range defines the environments in which the device is guaranteed to meet specifications; both share the same industrial range here. |
| Typical application focus | Seismic / energy exploration, high-resolution instrumentation | Motor control, isolated current sensing, industrial measurement | Application focus indicates the intended signal chain; the ADS1282 targets ultra-high-precision seismic data acquisition while the ADS1208 targets isolated modulator-based sensing. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1282IPW | 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) | 4k | 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 | 31 | - |
| Number of Inputs | 1 | - |
| Input Type | Differential | - |
| Configuration | ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | - |
| Features | PGA | - |
Frequently asked questions
What are the primary functional differences between the ADS1282IPW and ADS1208IPWR?
The ADS1282IPW is a high-resolution, 31-bit delta-sigma analog-to-digital converter (ADC) designed for seismic and energy exploration applications, featuring a programmable gain amplifier (PGA) and multiple filter options. The ADS1208IPWR is a 16-bit, second-order delta-sigma modulator with an integrated current-shunt interface, intended for isolated current sensing and industrial motor control. They differ fundamentally in resolution, architecture, and target application.
Are the ADS1282IPW and ADS1208IPWR pin-to-pin or package compatible?
No. The ADS1282IPW is supplied in a 28-pin TSSOP (PW) package, while the ADS1208IPWR is supplied in a 16-pin TSSOP (PW) package. The pin counts, pin functions, and package dimensions differ, so they are not drop-in replacements for one another.
What are the resolution and data rate specifications for each device?
The ADS1282IPW provides up to 31-bit resolution with programmable data rates typically ranging from 250 SPS to 4 kSPS, depending on filter configuration. The ADS1208IPWR is a 16-bit modulator with a typical data rate of 10 MHz clock and an output word rate determined by the external clock and decimation filter, commonly used in the range of tens of kSPS. These specifications are not interchangeable.
Can the ADS1208IPWR be used as a direct substitute for the ADS1282IPW in seismic or precision measurement designs?
No. The ADS1282IPW is specifically characterized for high-resolution seismic and energy exploration with low noise and integrated PGA, whereas the ADS1208IPWR is a 16-bit modulator optimized for current sensing with an integrated shunt interface. Substitution would require complete redesign of the signal chain, filtering, and interface circuitry, and is not supported by the manufacturers as a direct replacement.
What are the typical supply voltage and interface differences between the two parts?
The ADS1282IPW typically operates from a 5 V analog supply and a 3.3 V digital supply, with a serial peripheral interface (SPI) for configuration and data readout. The ADS1208IPWR operates from a 5 V supply and provides a single-bit delta-sigma modulated output stream, requiring an external digital filter or FPGA for decimation. The interface and supply architectures are not compatible without additional circuitry.
Do both devices support the same operating temperature range?
Both the ADS1282IPW and ADS1208IPWR are specified for the industrial temperature range of –40°C to +85°C, as stated in their respective manufacturer datasheets. However, this commonality does not imply interchangeability, as their functional and package characteristics differ.
Which device is better suited for isolated current sensing in motor control applications?
The ADS1208IPWR is specifically designed for isolated current sensing, featuring an integrated current-shunt interface and a modulated output suitable for isolation barriers. The ADS1282IPW is not intended for this application and lacks the integrated shunt interface and modulator output architecture required for isolated current measurement.