Part A
AD1674JR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 62 Stückzahl
- Package
- SOIC-28
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The AD1674JR and AD1671KP are not functionally interchangeable. They differ in resolution, conversion architecture, package type, and operating temperature range, requiring full circuit redesign and validation before any substitution can be considered.
Different resolution
Different architecture
Different package type
Different temperature range
Parts at a glance
Part B
AD1671KP
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 114 Stückzahl
- Package
- LCC-28
- Series
- Datenerfassung mit Analog to Digital Converters (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 | AD1674JR | AD1671KP | Why it matters |
|---|---|---|---|
| Resolution | 12 bits | 12 bits | Both converters provide 12-bit resolution, so they offer the same nominal quantization granularity for the analog input. |
| Sampling Rate | 100 kSPS | 1.25 MSPS | The maximum throughput determines whether the ADC can capture fast-changing signals or support high-speed data acquisition systems. |
| Architecture | Successive approximation register (SAR) | Flash | The conversion architecture affects speed, latency, power, and the need for external sample-and-hold circuitry. |
| Input Type | Single-ended | Differential | Single-ended versus differential input affects signal conditioning requirements, noise immunity, and achievable dynamic performance. |
| Analog Input Range | ±10 V, ±5 V, 0 V to +10 V, 0 V to +20 V | ±2.5 V | The supported input span must match the sensor or signal chain output to avoid additional amplification or attenuation stages. |
| Supply Voltage | ±15 V and +5 V | ±5 V | Supply requirements determine power rail compatibility and whether the device can drop into an existing board design. |
| Package | 28-lead SOIC | 28-lead PLCC | Package type and footprint must match the PCB layout for direct substitution without a board redesign. |
| Operating Temperature Range | 0°C to +70°C | 0°C to +70°C | The temperature grade indicates whether the part is suitable for commercial, industrial, or military environments. |
| Interface | Parallel | Parallel | The digital interface must be compatible with the host processor or FPGA to ensure correct data transfer. |
| Power Consumption | 385 mW typical | 1.2 W typical | Power dissipation affects thermal management, supply sizing, and suitability for power-sensitive applications. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD1674JR | AD1671KP |
|---|---|---|
| Supplier | Analog Devices Inc.,Rochester Electronics, LLC | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Obsolete | Obsolete |
| Number of Bits | 12 | 12 |
| Sampling Rate(Per Second) | 100k | 1.25M |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | Parallel | Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | Pipelined |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | ±11.4V ~ 16.5V | ±5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | 0°C ~ 70°C | 0°C ~ 70°C |
Frequently asked questions
What are the primary differences between the AD1674JR and AD1671KP analog-to-digital converters?
The AD1674JR is a 12-bit, 100 kSPS successive-approximation ADC with a built-in sample-and-hold amplifier and a parallel microprocessor interface, specified over the commercial temperature range. The AD1671KP is a 12-bit, 1.25 MSPS monolithic sampling ADC with an on-chip track-and-hold and a high-speed parallel output, specified over the industrial temperature range. The AD1671KP offers a significantly higher maximum sampling rate and a faster interface, while the AD1674JR provides a complete, lower-speed conversion solution with integrated reference and clock.
Can the AD1674JR and AD1671KP be used interchangeably in an existing design?
No. The two devices differ in pinout, package, sampling rate, interface timing, and analog input architecture. The AD1674JR is available in a 28-pin plastic DIP or SOIC package, while the AD1671KP is offered in a 28-pin plastic DIP or SOIC package with a different pin function assignment. Direct substitution without redesign is not supported by the manufacturer datasheets.
What is the maximum sampling rate of each device?
The AD1674JR has a maximum sampling rate of 100 kSPS. The AD1671KP has a maximum sampling rate of 1.25 MSPS. These values are specified in the respective Analog Devices datasheets.
Do both ADCs include an on-chip sample-and-hold amplifier?
Yes. The AD1674JR integrates a sample-and-hold amplifier that acquires the analog input signal during the conversion cycle. The AD1671KP includes an on-chip track-and-hold amplifier that supports its higher sampling rate. Both devices therefore accept time-varying analog inputs without requiring an external sample-and-hold circuit.
What are the operating temperature ranges for the AD1674JR and AD1671KP?
The AD1674JR is specified for the commercial temperature range of 0°C to +70°C. The AD1671KP is specified for the industrial temperature range of –40°C to +85°C. These ranges are defined in the Analog Devices datasheets for each grade.
What type of digital interface does each ADC provide?
The AD1674JR provides a 12-bit parallel microprocessor-compatible interface with standard control signals such as CS, RD, and CONVERT. The AD1671KP provides a high-speed 12-bit parallel output with separate convert start and output enable controls, optimized for fast data acquisition systems. Both interfaces are parallel, but their timing and control protocols differ.
Are the analog input ranges of the AD1674JR and AD1671KP the same?
No. The AD1674JR offers selectable analog input ranges of 10 V, 20 V, and ±10 V, depending on the configuration of the input connections. The AD1671KP provides a fixed analog input range of ±2.5 V. Designers must account for this difference when scaling the analog front-end.
Which device is more suitable for high-speed data acquisition applications?
The AD1671KP is more suitable for high-speed data acquisition because its 1.25 MSPS sampling rate is more than ten times that of the AD1674JR. The AD1674JR is intended for lower-speed, general-purpose instrumentation and control applications where its 100 kSPS rate and integrated features are sufficient.