Part A
ADS1263IPW
德州儀器
- Lifecycle
- Active
- Stock
- 4618 件
- Package
- TSSOP-28
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS1263IPW and ADS1208IPWRG4 are not drop-in replacements for one another. The ADS1263IPW is a 32-bit, 10-channel precision delta-sigma ADC with an integrated PGA and reference, while the ADS1208IPWRG4 is a single-channel, 16-bit delta-sigma modulator with a differential input and no integrated ADC core. Their architectures, channel counts, resolution, and package footprints differ fundamentally, so substituting one for the other requires a complete circuit redesign rather than a direct swap.
Different converter architecture
Different channel count
Different resolution
Different package footprint
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 | ADS1263IPW | ADS1208IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 32 | 16 | Resolution determines the smallest signal change the ADC can distinguish; a 32-bit delta-sigma converter offers far finer measurement granularity than a 16-bit device. |
| Architecture | Delta-sigma (with integrated PGA and reference) | Delta-sigma modulator | The ADS1263 is a complete ADC with PGA and reference, while the ADS1208 is a modulator-only device requiring external digital filtering, affecting system complexity and substitutability. |
| Number of input channels | 10 (5 differential / 10 single-ended) | 1 differential | Channel count determines how many signals can be measured; the ADS1263 supports multi-channel systems while the ADS1208 handles a single differential input. |
| Output interface | SPI | Digital modulator bitstream (1-bit) | The output format dictates how the host processor reads data; SPI provides direct digital codes while a modulator bitstream requires an external digital filter/decimation stage. |
| Supply voltage (analog) | 5 V (analog), 2.7 V to 5.25 V (digital) | 5 V | Supply requirements affect power rail design and compatibility; differing analog/digital rail flexibility influences direct board-level substitution. |
| Package | TSSOP-28 | TSSOP-16 | Package footprint and pin count must match for physical board compatibility; different packages require layout changes and prevent drop-in replacement. |
| Integrated PGA | Yes | No | An integrated programmable gain amplifier allows direct connection of low-level sensors; its absence in the ADS1208 requires external signal conditioning. |
| Integrated voltage reference | Yes | No | An on-chip reference simplifies design and improves accuracy; the ADS1208 needs an external reference, adding components and affecting measurement stability. |
| Operating temperature range | -40°C to +125°C | -40°C to +105°C | The temperature range defines the environments where the part is reliable; a wider range supports harsher industrial applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1263IPW | ADS1208IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Type | - | Modulator |
| Number of Channels | - | 1 |
| Resolution(Bits) | - | 16 b |
| Sampling Rate(Per Second) | 38k | 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 ~ 125°C | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
| Number of Bits | 32 | - |
| Number of Inputs | 5, 10 | - |
| Input Type | Differential, Single Ended | - |
| Configuration | MUX-PGA-ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | - |
| Features | PGA, Temperature Sensor | - |
Frequently asked questions
What are the primary functional differences between the ADS1263IPW and the ADS1208IPWRG4?
The ADS1263IPW is a 32-bit, 38-kSPS, 10-channel delta-sigma ADC with an integrated PGA and dual excitation current sources, designed for high-precision sensor measurement. The ADS1208IPWRG4 is a 16-bit, 10-MHz second-order delta-sigma modulator with an integrated driver for current measurement and isolated applications. The ADS1263 integrates a full ADC signal chain, while the ADS1208 provides a modulated bitstream requiring external digital filtering.
Do the ADS1263IPW and ADS1208IPWRG4 share the same package and pinout?
No. The ADS1263IPW is supplied in a 28-pin TSSOP (PW) package, while the ADS1208IPWRG4 is supplied in a 16-pin TSSOP (PW) package. The pin counts and pin functions differ, so the two devices are not pin-compatible and cannot be interchanged on the same PCB land pattern.
What are the resolution and data rate specifications for each device?
The ADS1263IPW offers up to 32-bit resolution with programmable data rates from 2.5 SPS to 38.4 kSPS. The ADS1208IPWRG4 is a 16-bit delta-sigma modulator operating with a clock up to 10 MHz, producing a 1-bit modulated output stream that is decimated externally to achieve 16-bit resolution. The two devices are not directly comparable in resolution because the ADS1208 requires an external digital filter to produce a multi-bit result.
Which device is better suited for isolated current-sense applications?
The ADS1208IPWRG4 is specifically designed for current measurement with an integrated driver and a modulated output that supports galvanic isolation when paired with a digital isolator and external sinc filter. The ADS1263IPW is a complete ADC intended for direct high-precision sensor interfacing and does not provide an isolated modulator output, so it is not the typical choice for isolated current-sense designs.
How do the input channel configurations of the ADS1263IPW and ADS1208IPWRG4 differ?
The ADS1263IPW provides 10 input channels (5 differential or 10 single-ended) with an integrated PGA and input multiplexer. The ADS1208IPWRG4 provides a single differential input channel intended for direct connection to a shunt or current-sense element. Designs requiring multi-channel scanning should use the ADS1263IPW, while single-channel isolated current measurement aligns with the ADS1208IPWRG4.
Can the ADS1263IPW and ADS1208IPWRG4 operate from the same supply voltage?
No, their supply requirements differ. The ADS1263IPW operates from an analog supply of 5 V (with a digital supply of 2.7 V to 5.25 V) and supports bipolar analog supplies. The ADS1208IPWRG4 operates from a 5 V analog supply and a 2.7 V to 5.5 V digital supply. While both use a 5 V analog rail, the ADS1263IPW supports a wider analog supply range and additional bipolar operation, so supply architectures are not identical.
Are the ADS1263IPW and ADS1208IPWRG4 drop-in replacements for one another?
No. The devices differ in package pin count (28-pin vs 16-pin TSSOP), resolution (32-bit ADC vs 16-bit modulator), output format (parallel/SPI digital output vs 1-bit modulated stream), channel count, and intended application. A direct substitution is not possible; any redesign must account for package, interface, filtering, and supply differences.