Part A
ADS1247IPWR
德州儀器
- Lifecycle
- Active
- Stock
- 3449 件
- Package
- TSSOP-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS1247IPWR and ADS1203IPWRG4 are not functionally interchangeable: the ADS1247IPWR is a 24-bit delta-sigma ADC with an integrated PGA and SPI interface, while the ADS1203IPWRG4 is a 16-bit isolated delta-sigma modulator with a single-bit output stream. They differ in resolution, output interface, input architecture, and package pinout, so direct substitution is not possible without a full system redesign.
Different output interface
Different resolution class
Different input architecture
Different package pinout
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 | ADS1247IPWR | ADS1203IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Resolution determines the smallest signal change the converter can distinguish; a 24-bit delta-sigma ADC offers far finer resolution than a 16-bit device, affecting measurement precision and dynamic range. |
| Architecture / Output Type | Delta-sigma ADC with SPI digital output | Delta-sigma modulator with 1-bit bitstream output | The ADS1247 provides a complete ADC with a digital SPI interface, while the ADS1203 outputs a raw 1-bit modulator stream requiring external digital filtering; this fundamentally changes system design and substitutability. |
| Number of Input Channels | 4 (differential/ single-ended, 2 differential) | 1 (differential) | Channel count determines how many signals can be measured; the ADS1247 supports multiple inputs via an internal multiplexer, whereas the ADS1203 handles a single differential input. |
| PGA / Internal Gain | Yes (PGA, gain 1 to 128) | No | A programmable gain amplifier allows direct amplification of small sensor signals before conversion; the ADS1203 lacks an internal PGA, requiring external signal conditioning. |
| Supply Voltage (analog) | 2.7 V to 5.25 V | 4.5 V to 5.5 V | The analog supply range affects compatibility with system power rails; the ADS1247 operates over a wider low-voltage range, while the ADS1203 requires a nominal 5 V supply. |
| Interface | SPI (serial peripheral interface) | 1-bit modulator output (no standard serial bus) | The interface dictates how the device connects to a host controller; the ADS1247 uses a standard SPI bus, while the ADS1203 requires a dedicated digital filter or capture peripheral. |
| Package | TSSOP-20 | TSSOP-16 | Package footprint and pin count affect PCB layout and drop-in compatibility; differing pin counts mean the two parts are not footprint-compatible. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +85 °C | The temperature range determines suitability for harsh environments; the ADS1247 supports a wider upper limit, offering more margin in industrial applications. |
| Typical Application Focus | Precision sensor measurement (RTD, thermocouple, load cell) | Motor control and isolated current/voltage sensing | The intended application indicates functional role; the ADS1247 targets precision low-frequency sensing, while the ADS1203 targets high-speed modulator-based current sensing, limiting direct substitutability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1247IPWR | ADS1203IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Type | - | Modulator |
| Number of Channels | - | 1 |
| Resolution(Bits) | - | 16 b |
| Sampling Rate(Per Second) | 2k | 40k |
| Data Interface | SPI | Serial |
| Voltage Supply Source | - | Single Supply |
| Voltage - Supply | - | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
| Mounting Type | - | Surface Mount |
| Number of Bits | 24 | - |
| Number of Inputs | 2, 3 | - |
| 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 | 2.7V ~ 5.25V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | - |
| Features | PGA, Temperature Sensor | - |
Frequently asked questions
What are the primary functional differences between the ADS1247IPWR and ADS1203IPWRG4?
The ADS1247IPWR is a 24-bit, 2-kSPS, four-channel delta-sigma analog-to-digital converter with an integrated programmable gain amplifier and excitation current sources, intended for precision sensor measurement. The ADS1203IPWRG4 is a 16-bit, 10-MHz clock, second-order delta-sigma modulator that outputs a 1-bit data stream for isolated or shunt-based current sensing. They differ fundamentally in resolution, output format, and target application.
Are the ADS1247IPWR and ADS1203IPWRG4 pin-to-pin or functionally interchangeable?
No. The ADS1247IPWR is supplied in a TSSOP-20 package, while the ADS1203IPWRG4 is supplied in a TSSOP-8 package. Pin counts, pin functions, and output interfaces differ, so they are not direct substitutes and require separate PCB layouts and interface designs.
What are the resolution and data rate specifications of each device?
The ADS1247IPWR provides 24-bit resolution with programmable data rates up to 2 kSPS. The ADS1203IPWRG4 is a 16-bit modulator that produces a 1-bit delta-sigma bitstream at a 10-MHz master clock, with the effective resolution determined by the external digital filter and decimation ratio.
What output interface does each converter provide?
The ADS1247IPWR provides a serial peripheral interface (SPI-compatible) for reading converted data and configuring registers. The ADS1203IPWRG4 outputs a single-bit delta-sigma data stream (MDO) plus a clock output (MCLK), which must be processed by an external digital filter or FPGA/controller.
Which device is better suited for isolated current-sensing applications?
The ADS1203IPWRG4 is designed for current-shunt and isolated measurement applications because its 1-bit modulator output can be passed through a digital isolator, preserving signal integrity across an isolation barrier. The ADS1247IPWR is a complete ADC intended for direct precision voltage/sensor measurement and is not optimized for isolated current-sense signal chains.
Do both devices include an integrated programmable gain amplifier?
The ADS1247IPWR includes an integrated low-noise programmable gain amplifier (PGA) with selectable gains for direct connection of low-level sensors. The ADS1203IPWRG4 does not include a PGA; its input is a modulator stage intended for shunt or low-level signal inputs with external signal conditioning as required.
What are the supply voltage requirements for each part?
The ADS1247IPWR operates from an analog supply (AVDD) of 2.7 V to 5.25 V and a digital supply (DVDD) of 2.7 V to 5.25 V. The ADS1203IPWRG4 operates from a single 5-V supply (AVDD and DVDD at 5 V nominal). Designers should confirm exact limits in the respective manufacturer datasheets.
Can the ADS1203IPWRG4 replace the ADS1247IPWR in an existing precision measurement design?
No. The ADS1203IPWRG4 lacks an integrated PGA, provides only a 1-bit modulator output requiring external digital filtering, and is packaged in a TSSOP-8 versus the TSSOP-20 of the ADS1247IPWR. Replacing one with the other would require redesign of the signal chain, digital interface, and PCB layout.