Part A
ADS1282IPW
德州儀器
- Lifecycle
- Active
- Stock
- 4636 件
- Package
- TSSOP-28
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS1282IPW and ADS1208IPWRG4 are not functionally interchangeable: the ADS1282IPW is a high-resolution 32-bit delta-sigma ADC with an integrated PGA and SPI interface, while the ADS1208IPWRG4 is a 16-bit isolated delta-sigma modulator with a different output format, resolution, and package. Designers must redesign the signal chain, interface, and board layout rather than substitute one part for the other.
Different output type
Different resolution
Different package
Different interface
Parts at a glance
Part B
ADS1208IPWRG4
德州儀器
- Lifecycle
- Active
- Stock
- 4872 件
- Package
- TSSOP-16
- Series
- 資料獲取-ADC DAC-專用
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 | ADS1208IPWRG4 | 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 granularity 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 style device, affecting noise and application fit. |
| Sample Rate (max) | 4 kSPS | 40 kSPS | Maximum sample rate sets the bandwidth of signals that can be captured; the ADS1208 supports higher throughput while the ADS1282 trades speed for resolution. |
| Input Type | Differential | Differential | Differential inputs improve common-mode noise rejection; both are differential, so this is not a differentiator for substitutability. |
| Interface | SPI | SPI | A serial peripheral interface determines how the converter connects to a host MCU/DSP; both use SPI, easing digital-side substitution. |
| Supply Voltage | 2.7 V to 5.25 V (analog), 1.8 V to 3.6 V (digital) | 4.5 V to 5.5 V | Supply requirements dictate power-rail compatibility; the ADS1282 supports lower and split rails while the ADS1208 needs a 5 V supply. |
| Package | TSSOP-28 | TSSOP-16 | Package footprint and pin count affect PCB layout and drop-in compatibility; different pin counts prevent direct board substitution. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Temperature range defines environmental robustness; both cover the industrial range, so this is not a differentiator. |
| Typical Application Focus | Seismic and energy exploration, high-resolution instrumentation | Motor control, current sensing, isolated measurement | Application focus reflects the intended signal chain; the two parts target different end uses, limiting functional substitutability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1282IPW | ADS1208IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| 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 ADS1208IPWRG4?
The ADS1282IPW is a high-resolution, 32-bit delta-sigma analog-to-digital converter (ADC) designed for seismic and energy exploration applications, featuring a programmable gain amplifier (PGA) and operating from a single 5 V analog supply. The ADS1208IPWRG4 is a 16-bit, second-order delta-sigma modulator with an integrated driver, intended for isolated current and voltage sensing in motor control and power conversion systems. They differ fundamentally in resolution, architecture, and target application.
Are the ADS1282IPW and ADS1208IPWRG4 pin-to-pin compatible?
No. The ADS1282IPW is supplied in a 28-pin TSSOP package, while the ADS1208IPWRG4 is supplied in a 16-pin TSSOP package. The pin counts and pin functions 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 32-bit resolution with programmable data rates from 250 SPS to 4 kSPS. The ADS1208IPWRG4 is a 16-bit modulator with a typical clock frequency of 10 MHz, yielding a data rate determined by the external digital filter and clock configuration.
Do both devices include an integrated programmable gain amplifier (PGA)?
No. The ADS1282IPW includes an integrated PGA with selectable gains of 1, 2, 4, 8, 16, 32, and 64. The ADS1208IPWRG4 does not include an integrated PGA; it is a modulator intended to be paired with an external driver and digital filter.
What are the analog supply voltage requirements for the ADS1282IPW and ADS1208IPWRG4?
The ADS1282IPW operates from a single 5 V analog supply (with a separate digital supply). The ADS1208IPWRG4 operates from a 5 V analog supply and a 3.3 V or 5 V digital supply, depending on the logic interface configuration specified in the datasheet.
Which device is better suited for seismic or precision measurement applications?
The ADS1282IPW is specifically designed for seismic and precision measurement applications, offering 32-bit resolution, low noise, and an integrated PGA. The ADS1208IPWRG4, being a 16-bit modulator, is better suited for isolated current and voltage sensing in motor control and power conversion rather than high-resolution seismic data acquisition.
Can the ADS1208IPWRG4 be used as a direct substitute for the ADS1282IPW in an existing design?
No. The two devices differ in resolution (16-bit vs. 32-bit), package (16-pin vs. 28-pin TSSOP), integrated features (no PGA vs. integrated PGA), and target application. A direct substitution would require significant redesign of the analog front end, digital filtering, and PCB layout, and must be validated against the respective manufacturer datasheets.