Part A
ADS1263IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 4618 Stückzahl
- Package
- TSSOP-28
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1263IPW and ADS1208IPWR are not functionally interchangeable. The ADS1263IPW is a 32-bit, 10-channel precision delta-sigma ADC with an integrated PGA and dual excitation current sources, while the ADS1208IPWR is a single-channel 16-bit delta-sigma modulator with an integrated current source. They differ in resolution, channel count, output interface, and package, so the ADS1208IPWR cannot directly replace the ADS1263IPW in existing designs.
Different resolution
Different channel count
Different output interface
Different package
Parts at a glance
Part B
ADS1208IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 7626 Stückzahl
- Package
- TSSOP-16
- Series
- Datenerfassung von ADCs-DACs für besonderen Zweck
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 | ADS1208IPWR | 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 resolution 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 register access, whereas the modulator output requires an external digital filter (e.g., sinc filter). |
| Maximum data rate / sample rate | 38.4 kSPS | 10 MHz modulator clock (bitstream) | Data rate affects achievable throughput and noise trade-off; the ADS1263 specifies an output sample rate while the ADS1208 specifies a modulator clock rate. |
| Integrated PGA | Yes | No | An integrated PGA allows direct connection of low-level sensors without external amplification, simplifying design and improving substitutability for sensor applications. |
| Integrated voltage reference | Yes | No | An on-chip reference reduces external component count and board space; the ADS1208 requires an external reference for accurate conversion. |
| Supply voltage | 5 V (analog), 2.7 V to 5.25 V (digital) | 5 V (analog and digital) | Supply requirements affect power rail design and compatibility; differing analog/digital supply ranges influence whether a part can drop into an existing design. |
| Package | 28-pin TSSOP | 16-pin TSSOP | Package and pin count affect PCB footprint and layout; different packages mean the parts are not drop-in replacements for one another. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +85 °C | The temperature range determines suitability for harsh or industrial environments; the wider range of the ADS1263 supports more demanding applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1263IPW | 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) | 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 ADS1208IPWR?
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 ADS1208IPWR is a 16-bit, 40-kSPS, single-channel delta-sigma modulator with an integrated PGA, intended for isolated current sensing and industrial motor control applications. The ADS1263 integrates a full ADC with digital filter and reference, while the ADS1208 provides a modulated bitstream output requiring external digital filtering.
Are the ADS1263IPW and ADS1208IPWR pin-to-pin or package compatible?
No. The ADS1263IPW is supplied in a 28-pin TSSOP (PW) package, while the ADS1208IPWR is supplied in a 16-pin TSSOP (PW) package. The differing pin counts and pin functions preclude direct PCB footprint interchangeability without a redesign.
What are the resolution and data rate specifications of each device?
The ADS1263IPW provides 32-bit resolution with programmable data rates up to 38 kSPS. The ADS1208IPWR provides 16-bit resolution with a maximum data rate of 40 kSPS. The ADS1263 offers higher resolution, while the ADS1208 offers a slightly higher maximum output rate.
Do both devices include an integrated programmable gain amplifier (PGA)?
Yes. Both the ADS1263IPW and ADS1208IPWR integrate a PGA. The ADS1263 PGA supports gains from 1 to 32, while the ADS1208 PGA supports gains of 1, 2, 4, 8, 16, 32, 64, and 128, allowing direct interface to low-level sensor signals in both cases.
What output interface does each device provide?
The ADS1263IPW provides a SPI-compatible serial interface for reading converted ADC data and configuring registers. The ADS1208IPWR outputs a 1-bit delta-sigma modulated bitstream that must be processed by an external digital filter or microcontroller to obtain numeric conversion results.
Which device is better suited for isolated current-sensing applications?
The ADS1208IPWR is specifically intended for isolated current sensing, as its modulated bitstream output can be transmitted across an isolation barrier and digitally filtered on the isolated or non-isolated side. The ADS1263IPW, with its integrated digital filter and SPI interface, is oriented toward direct high-precision multi-channel sensor measurement rather than isolated current-sense signal chains.
Can the ADS1208IPWR replace the ADS1263IPW in an existing design without firmware changes?
No. The two devices differ in resolution, package, pin count, output format, and register architecture. The ADS1263IPW delivers parallel-word ADC results over SPI, whereas the ADS1208IPWR delivers a 1-bit modulated stream requiring a sinc or similar digital filter. Firmware, PCB layout, and signal-chain design would all require modification.