Part A
ADS1243IPWR
德州儀器
- Lifecycle
- Active
- Stock
- 2763 件
- Package
- TSSOP-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS1243IPWR and ADS1208IPWRG4 are not functionally interchangeable. The ADS1243IPWR is a 24-bit delta-sigma ADC with an SPI interface and integrated PGA, while the ADS1208IPWRG4 is a 16-bit delta-sigma modulator with a single-bit output and no integrated ADC core. Their differing resolution, output architecture, channel configuration, and package pinout make direct substitution impractical without a full system redesign.
Different output type
Different resolution
Different channel count
Different interface architecture
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 | ADS1243IPWR | ADS1208IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Resolution determines the smallest signal change the ADC can distinguish; a 24-bit delta-sigma converter offers far finer resolution than a 16-bit device, affecting measurement precision. |
| Architecture | Delta-Sigma (with PGA) | Delta-Sigma modulator | The ADS1243 integrates a programmable gain amplifier and digital filter for direct sensor interfacing, while the ADS1208 is a modulator-only device requiring external digital filtering, changing system design complexity. |
| Number of Input Channels | 8 (single-ended) / 4 (differential) | 1 (differential) | Channel count determines how many signals can be measured; the ADS1243 supports multi-channel multiplexed sensing while the ADS1208 handles a single differential input. |
| Interface Type | SPI (serial) | Serial digital output (modulator bitstream) | The output interface dictates how the host processor reads data; SPI provides framed conversion results, whereas the ADS1208 outputs a 1-bit modulator stream needing external decimation. |
| Supply Voltage (analog) | 2.7 V to 5.25 V | 4.5 V to 5.5 V | Supply range affects compatibility with system power rails; the ADS1243 operates over a wider low-voltage range, while the ADS1208 requires a nominal 5 V supply. |
| Package | TSSOP-20 | TSSOP-16 | Package footprint and pin count affect PCB layout and drop-in substitutability; differing pin counts mean the two parts are not footprint-compatible. |
| Integrated PGA | Yes | No | An integrated PGA allows direct amplification of low-level sensor signals without external circuitry, simplifying design and improving noise performance for small-signal measurements. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range indicates environmental robustness; both parts share the same industrial range, so this parameter does not differentiate them for harsh-environment use. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1243IPWR | ADS1208IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Type | - | Modulator |
| Number of Channels | - | 1 |
| Resolution(Bits) | - | 16 b |
| Sampling Rate(Per Second) | 15 | 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 | 24 | - |
| Number of Inputs | 8 | - |
| Input Type | Differential, Single Ended | - |
| Configuration | MUX-PGA-ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | - |
| Features | PGA | - |
Frequently asked questions
What are the primary functional differences between the ADS1243IPWR and ADS1208IPWRG4?
The ADS1243IPWR is a 24-bit delta-sigma analog-to-digital converter (ADC) with a built-in PGA and an SPI-compatible serial interface, designed for precision low-frequency measurement. The ADS1208IPWRG4 is a 16-bit delta-sigma modulator that outputs a 1-bit data stream for use with an external digital filter or FPGA, intended for isolated current sensing and motor control applications. They are not functionally interchangeable.
Do the ADS1243IPWR and ADS1208IPWRG4 have the same resolution?
No. The ADS1243IPWR provides 24-bit resolution, while the ADS1208IPWRG4 is a 16-bit delta-sigma modulator. The ADS1208IPWRG4 outputs a 1-bit modulated stream that must be digitally filtered to obtain 16-bit conversion results.
Are the ADS1243IPWR and ADS1208IPWRG4 pin-compatible?
No. Both devices are offered in a TSSOP package, but their pin functions and internal architectures differ. The ADS1243IPWR integrates an ADC with PGA and SPI interface, whereas the ADS1208IPWRG4 provides a modulator output and clock interface. They cannot be used as drop-in replacements for each other.
What are the typical applications for each device?
The ADS1243IPWR is typically used in precision sensor measurement, industrial process control, weigh scales, and temperature/pressure sensing where high-resolution conversion is required. The ADS1208IPWRG4 is typically used in motor control, isolated current sensing, and power monitoring where a modulated data stream is processed by an external digital filter.
Do both devices support the same digital interface?
No. The ADS1243IPWR uses an SPI-compatible serial interface for configuration and data readout. The ADS1208IPWRG4 outputs a 1-bit delta-sigma modulated data stream with a clock input, requiring an external digital filter or controller to reconstruct the conversion result.
Can the ADS1208IPWRG4 be used as a direct substitute for the ADS1243IPWR in an existing design?
No. The devices differ in resolution, output format, interface, and internal architecture. Substitution would require redesign of the digital interface, filtering, and signal chain, and must be validated against the manufacturer datasheets for both parts.
Are both devices specified for similar supply voltage ranges?
Both devices operate from a single 5 V analog supply in typical configurations, but the ADS1243IPWR also supports a separate digital supply and includes an on-chip PGA, while the ADS1208IPWRG4 is designed as a modulator with its own supply and reference requirements. Designers should verify exact supply and reference conditions in the respective manufacturer datasheets.