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 ADS1203IPWRG4 are not functionally interchangeable. The ADS1282IPW is a high-resolution 32-bit delta-sigma ADC with an integrated PGA and low-noise architecture intended for seismic and precision sensor acquisition, while the ADS1203IPWRG4 is a 16-bit isolated delta-sigma modulator with a digital output interface designed for current-shunt and isolated measurement paths. Their resolution, output interface, input architecture, and package footprint differ fundamentally, so substituting one for the other would require a complete redesign of the signal chain, interface, and board layout.
Different output type
Different resolution
Different input architecture
Different package footprint
Parts at a glance
Part B
ADS1203IPWRG4
德州儀器
- Lifecycle
- Active
- Stock
- 4572 件
- Package
- TSSOP-8
- 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 | ADS1203IPWRG4 | 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 ADC while the ADS1203 is a modulator-only device requiring external digital filtering. |
| Output Interface | SPI (serial) | Digital modulator bitstream | The ADS1282 provides a complete digital output word over SPI, whereas the ADS1203 outputs a 1-bit modulator stream that must be processed by an external digital filter. |
| Input Type | Differential | Differential | Differential inputs improve common-mode noise rejection; both parts support differential sensing, aiding substitutability in signal-chain design. |
| Supply Voltage (analog) | 5 V (analog), 3.3 V (digital) | 5 V | Supply requirements affect board-level power design; the ADS1282 uses separate analog and digital rails while the ADS1203 operates from a single 5 V supply. |
| Package | TSSOP-28 | TSSOP-16 | Package footprint and pin count determine PCB layout compatibility; the two devices are not drop-in replacements due to differing pin counts. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Matching industrial temperature ranges means both parts suit the same environmental conditions, supporting functional interchangeability. |
| Data Rate / Modulator Clock | Up to 4 kSPS (programmable) | Up to 10 MHz modulator clock | Output data rate and modulator clock define achievable bandwidth and settling time; the ADS1203's high modulator clock enables fast oversampling with external filtering. |
| Internal PGA / Gain | Yes (1 to 64) | No | An integrated programmable gain amplifier allows direct connection of low-level sensors; the ADS1203 lacks this, requiring external signal conditioning. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1282IPW | ADS1203IPWRG4 |
|---|---|---|
| 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 | - | Single Supply |
| Voltage - Supply | - | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 125°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 ADS1203IPWRG4?
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 supporting data rates up to 4 kSPS. The ADS1203IPWRG4 is a 16-bit, second-order delta-sigma modulator with a digital output, intended for isolated current and voltage sensing in motor control and power systems, operating at a fixed clock frequency of up to 20 MHz.
Are the ADS1282IPW and ADS1203IPWRG4 pin-to-pin compatible?
No. The ADS1282IPW is supplied in a 28-pin TSSOP package, while the ADS1203IPWRG4 is supplied in a 16-pin TSSOP package. The pin counts, pin functions, and package dimensions differ, so they are not drop-in replacements for each other.
What are the resolution and output data rate specifications for each device?
The ADS1282IPW provides 32-bit resolution with programmable output data rates from 250 SPS to 4 kSPS. The ADS1203IPWRG4 provides 16-bit resolution as a delta-sigma modulator, with its output data rate determined by the external clock frequency (up to 20 MHz) and the digital filter implemented downstream.
Do both devices include an integrated programmable gain amplifier (PGA)?
No. The ADS1282IPW includes an integrated low-noise PGA with selectable gains of 1, 2, 4, 8, 16, 32, and 64. The ADS1203IPWRG4 does not include an integrated PGA; it is a modulator-only device requiring external signal conditioning.
What are the typical supply voltage requirements for the ADS1282IPW and ADS1203IPWRG4?
The ADS1282IPW operates from an analog supply (AVDD) of 5 V and a digital supply (DVDD) of 3.3 V, with a separate unipolar or bipolar analog input supply range. The ADS1203IPWRG4 operates from a single 5 V analog supply (AVDD) and a 3.3 V digital supply (DVDD), consistent with its datasheet specifications.
Which device is better suited for isolated current sensing in motor control applications?
The ADS1203IPWRG4 is specifically designed for isolated current and voltage sensing, as its delta-sigma modulator output can be coupled through a digital isolator to a host controller, making it suitable for motor control and power inverter applications. The ADS1282IPW is optimized for high-resolution seismic and precision measurement applications rather than isolated current sensing.
What are the operating temperature ranges for the ADS1282IPW and ADS1203IPWRG4?
Both the ADS1282IPW and ADS1203IPWRG4 are specified for an operating temperature range of -40°C to +85°C, as stated in their respective manufacturer datasheets.
Can the ADS1203IPWRG4 directly replace the ADS1282IPW in an existing seismic data acquisition design?
No. The ADS1282IPW provides a complete 32-bit ADC with integrated PGA and digital filter, while the ADS1203IPWRG4 is a 16-bit modulator requiring an external digital filter and signal conditioning. The resolution, package, pinout, and functional architecture differ, so a direct replacement is not possible without redesigning the signal chain and PCB layout.