Part A
ADS1204IRHBR
德州儀器
- Lifecycle
- Active
- Stock
- 6898 件
- Package
- VQFN-32
- Series
- 資料獲取-ADC DAC-專用
Replacement verdict
Not a drop-in replacement
The ADS1204IRHBR and ADS1287IRHFR are not functionally interchangeable. They differ in resolution, architecture, channel count, and package, so the ADS1287IRHFR cannot directly replace the ADS1204IRHBR without a full redesign and validation of the signal chain.
Different resolution
Different architecture
Different channel count
Different package
Parts at a glance
Part B
ADS1287IRHFR
德州儀器
- Lifecycle
- Active
- Stock
- 6155 件
- Package
- VFQFN-24
- Series
- 資料獲取-模數轉換器（ADC）
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1204IRHBR | ADS1287IRHFR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 16 | 24 | Higher resolution enables finer signal detail and lower quantization noise, which is critical for precision measurement applications. |
| Architecture | Delta-sigma modulator | Delta-sigma ADC | A modulator outputs a bitstream requiring external filtering, while a full ADC integrates the digital filter, affecting system complexity and interface design. |
| Number of input channels | 4 | 1 | Channel count determines how many independent signals can be measured simultaneously, directly impacting multi-sensor system design. |
| Output interface | Serial bitstream (modulator output) | SPI (serial digital) | The output format dictates the required host interface and whether external digital filtering or decoding logic is needed. |
| Supply voltage | 5 V (analog and digital) | 3.3 V (analog and digital) | Supply voltage compatibility affects power rail design and whether level shifting is required when interfacing with the host system. |
| Package | VQFN-32 (5x5 mm) | VQFN-40 (6x6 mm) | Package footprint and pin count affect PCB layout, thermal performance, and mechanical fit, which are critical for drop-in substitutability. |
| Operating temperature range | -40 to +85 °C | -40 to +125 °C | A wider temperature range supports use in harsher environments and provides greater thermal margin in industrial applications. |
| Input type | Differential | Differential | Differential inputs improve common-mode noise rejection; matching input topology is essential for signal-chain compatibility. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1204IRHBR | ADS1287IRHFR |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Active |
| Number of Bits | - | 24 |
| Sampling Rate(Per Second) | 40k | 1k |
| Number of Inputs | - | 1 |
| Input Type | - | Differential |
| Data Interface | Parallel | SPI |
| Configuration | - | MUX-PGA-ADC |
| Ratio - S / H: ADC | - | 0:1 |
| Number of A/D Converters | - | 1 |
| Architecture | - | Sigma-Delta |
| Reference Type | - | External |
| Voltage - Supply, Analog | - | 4.75V ~ 5.25V |
| Voltage - Supply, Digital | - | 2.25V ~ 3.6V |
| Features | - | PGA |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
| Type | Modulator | - |
| Number of Channels | 4 | - |
| Resolution(Bits) | 16 b | - |
| Voltage Supply Source | Analog and Digital | - |
| Voltage - Supply | 2.7V ~ 5.5V | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the primary functional differences between the ADS1204IRHBR and the ADS1287IRHFR?
The ADS1204IRHBR is a four-channel, 16-bit delta-sigma modulator with a maximum data rate of 40 kSPS per channel, designed for isolated current and voltage sensing. The ADS1287IRHFR is a single-channel, 32-bit delta-sigma ADC with a maximum data rate of 4 kSPS, optimized for high-resolution seismic and energy exploration applications. They differ in resolution, channel count, data rate, and target application.
Are the ADS1204IRHBR and ADS1287IRHFR pin-to-pin or package compatible?
No. The ADS1204IRHBR is supplied in a 32-pin VQFN (RHB) package, while the ADS1287IRHFR is supplied in a 24-pin VQFN (RHF) package. The pin counts, package sizes, and pin functions differ, so they are not drop-in replacements for each other.
Can the ADS1204IRHBR and ADS1287IRHFR share the same digital interface and clocking scheme?
No. The ADS1204IRHBR provides a serial delta-sigma modulator output stream per channel and requires an external digital filter or modulator demodulator; its clock is supplied via the MCLK pin. The ADS1287IRHFR integrates a full ADC with on-chip digital filtering and provides a SPI-compatible serial interface for configuration and data readout. The interface protocols and system clocking requirements are not interchangeable.
Which device is better suited for multi-channel isolated current sensing?
The ADS1204IRHBR is better suited because it integrates four independent delta-sigma modulator channels in one package, allowing simultaneous multi-phase or multi-channel current and voltage sensing with a single device. The ADS1287IRHFR is a single-channel ADC and would require multiple devices for multi-channel sensing.
Which device offers higher resolution and lower noise for precision seismic or energy exploration measurements?
The ADS1287IRHFR offers higher resolution at 32 bits and is specified for low-noise, high-resolution seismic and energy exploration data acquisition. The ADS1204IRHBR provides 16-bit modulator resolution and is intended for isolated current and voltage sensing rather than high-resolution seismic measurement.
Do the ADS1204IRHBR and ADS1287IRHFR have the same supply voltage requirements?
No. The ADS1204IRHBR operates from a 5 V analog supply with a separate digital supply, while the ADS1287IRHFR operates from a 5 V analog supply and a 1.8 V to 3.3 V digital supply. The supply rails and sequencing requirements differ and must be verified against each device's datasheet before design.
Can the ADS1204IRHBR be used as a direct substitute for the ADS1287IRHFR in an existing seismic acquisition design?
No. The ADS1204IRHBR is a 16-bit, four-channel modulator without an integrated digital filter or SPI configuration interface, whereas the ADS1287IRHFR is a 32-bit, single-channel ADC with integrated digital filtering and a SPI interface. Resolution, channel count, package, and interface differences prevent a direct substitution without redesign.