Part A
AD7894ARZ-3
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3263 ПКС
- Package
- SOIC-8
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The AD7894ARZ-3 and AD7899AR-3 are not drop-in replacements for one another. Although both are Analog Devices ADCs, they differ in resolution, throughput, input configuration, and package, so substituting one for the other requires design validation and layout changes.
Different resolution
Different throughput
Different input configuration
Different package
Parts at a glance
Part B
AD7899AR-3
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 691 ПКС
- Package
- SOIC-28
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | AD7894ARZ-3 | AD7899AR-3 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 14 | 14 | Both are 14-bit ADCs, so nominal resolution is equivalent for substitutability. |
| Number of ADC channels | 1 | 1 | Single-channel architecture on both parts; channel count matches for direct replacement. |
| Sampling rate (max) | 200 kSPS | 400 kSPS | The AD7899 offers roughly double the throughput, which affects timing budget and system bandwidth. |
| Input type | Single-ended | Single-ended | Both accept single-ended analog inputs, so signal conditioning topology can remain the same. |
| Supply voltage (analog) | 5 V | 5 V | Matching 5 V analog supply simplifies power rail reuse in existing designs. |
| Interface | Serial (SPI/QSPI compatible) | Parallel | Serial versus parallel interface is a major difference affecting pinout, host wiring, and firmware. |
| Package | 20-lead SOIC | 28-lead SSOP | Different package and pin count prevent drop-in board replacement without layout changes. |
| Operating temperature range | -40 to +85 °C | -40 to +85 °C | Identical industrial temperature range supports use in the same environmental conditions. |
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 | AD7894ARZ-3 | AD7899AR-3 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | 14 |
| Sampling Rate(Per Second) | 200k | 400k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | 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 | SAR |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD7894ARZ-3 and AD7899AR-3?
The AD7894ARZ-3 is a 14-bit successive-approximation ADC with a 5 µs conversion time, while the AD7899AR-3 is a 14-bit ADC with a faster 2.2 µs conversion time and a 400 kSPS throughput rate. The AD7899AR-3 also includes a parallel interface, whereas the AD7894ARZ-3 provides a serial interface. Both operate from a single +5 V supply and are specified for the -3 grade input range of ±10 V.
Are the AD7894ARZ-3 and AD7899AR-3 pin-compatible?
No. The AD7894ARZ-3 is offered in a 24-lead SOIC package with a serial data output, while the AD7899AR-3 is offered in a 28-lead SOIC package with a parallel data bus. The different package sizes and pin functions prevent direct pin-to-pin substitution.
What is the input voltage range for the -3 grade of both parts?
Both the AD7894ARZ-3 and AD7899AR-3 are specified with a bipolar input range of ±10 V. The "-3" suffix in the part number denotes this ±10 V input range option from Analog Devices.
What are the throughput and conversion time specifications for each device?
The AD7894ARZ-3 has a conversion time of 5 µs and a maximum throughput rate of 150 kSPS. The AD7899AR-3 has a conversion time of 2.2 µs and a maximum throughput rate of 400 kSPS, making it the faster of the two converters.
What type of digital interface does each ADC provide?
The AD7894ARZ-3 provides a serial interface for connection to microcontrollers and DSPs. The AD7899AR-3 provides a parallel interface with a 14-bit data bus, suitable for direct connection to microprocessor buses.
Do both parts operate from the same power supply?
Yes. Both the AD7894ARZ-3 and AD7899AR-3 operate from a single +5 V analog and digital supply, which simplifies power supply design when comparing or migrating between the two devices.
What are the package and operating temperature specifications for these parts?
Both devices are supplied in SOIC packages and are specified for the industrial temperature range of -40 °C to +85 °C. The AD7894ARZ-3 uses a 24-lead SOIC, while the AD7899AR-3 uses a 28-lead SOIC.