Part A
AD7890ARZ-10
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6285 個数
- Package
- SOIC-24
- Series
- データ取得 - ADC/DAC - 特殊用途向け
Replacement verdict
Not a drop-in replacement
The AD7890ARZ-10 and AD7899AR-3 are not drop-in replacements for one another. Although both are Analog Devices 12-bit successive-approximation ADCs, they differ in resolution architecture, input configuration, package footprint, and digital interface, so a direct substitution is not possible without circuit redesign.
Different input configuration
Different package footprint
Different digital interface
Different conversion architecture
Parts at a glance
Part B
AD7899AR-3
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 691 個数
- Package
- SOIC-28
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | AD7890ARZ-10 | AD7899AR-3 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 12 | 14 | Higher resolution provides finer quantization of the input signal, directly affecting measurement accuracy and dynamic range. |
| Number of ADC channels | 8 (single-ended, via mux) | 1 (single-ended) | Channel count determines how many analog signals can be digitized; a multiplexed 8-channel part suits multi-sensor systems while a single-channel part suits one-signal designs. |
| Sampling rate (max) | 117 kSPS | 400 kSPS | Maximum throughput limits the bandwidth of signals that can be captured and is critical for fast or multiplexed acquisition. |
| Input voltage range | ±10 V (bipolar) | ±2.5 V (bipolar) | The full-scale input span must match the sensor or signal amplitude; mismatched ranges require external conditioning or lose dynamic range. |
| Supply voltage | 5 V single supply | 5 V single supply | Supply compatibility affects whether the part can drop into an existing rail without additional regulation. |
| Interface type | Serial (SPI-compatible) | Parallel | The digital interface must match the host controller; serial vs parallel changes pin count, board routing, and firmware. |
| Package | 24-lead SOIC (SOIC_W) | 28-lead SSOP | Package footprint and pinout determine PCB layout compatibility and whether a direct board swap is possible. |
| Integral nonlinearity (INL) | ±1 LSB (typ) | ±1.5 LSB (typ) | INL quantifies deviation from an ideal transfer function and bounds achievable accuracy in precision measurement applications. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | The rated temperature range must cover the application environment to guarantee specified performance. |
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 | AD7890ARZ-10 | AD7899AR-3 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | - | 14 |
| Sampling Rate(Per Second) | 117k | 400k |
| Number of Inputs | - | 1 |
| Input Type | - | Single Ended |
| Data Interface | SPI | Parallel |
| Configuration | - | S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | - | 1 |
| Architecture | - | SAR |
| Reference Type | - | External, Internal |
| Voltage - Supply, Analog | - | 5V |
| Voltage - Supply, Digital | - | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Type | Data Acquisition System (DAS) | - |
| Number of Channels | 8 | - |
| Resolution(Bits) | 12 b | - |
| Voltage Supply Source | Single Supply | - |
| Voltage - Supply | 5V | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
What are the primary differences between the AD7890ARZ-10 and the AD7899AR-3?
The AD7890ARZ-10 is an 8-channel, 12-bit data acquisition system with a serial interface and a 10 µs conversion time, housed in a 24-lead SOIC package. The AD7899AR-3 is a single-channel, 14-bit ADC with a parallel interface and a 2.2 µs conversion time, housed in a 28-lead SSOP package. They differ in resolution, channel count, interface type, speed, and package.
Are the AD7890ARZ-10 and AD7899AR-3 pin-compatible?
No. The AD7890ARZ-10 uses a 24-lead SOIC package, while the AD7899AR-3 uses a 28-lead SSOP package. The pin counts, pin functions, and package footprints differ, so they are not pin-compatible or directly interchangeable on the same PCB land pattern.
How do the resolutions and channel counts of these two ADCs compare?
The AD7890ARZ-10 provides 12-bit resolution across 8 input channels via an internal multiplexer. The AD7899AR-3 provides 14-bit resolution on a single input channel. The AD7899AR-3 therefore offers higher resolution but no multiplexed multi-channel capability.
What are the digital interface differences between the AD7890ARZ-10 and AD7899AR-3?
The AD7890ARZ-10 uses a serial interface for data output, making it suitable for systems with limited digital I/O. The AD7899AR-3 uses a parallel interface, which provides faster data transfer to a host processor or DSP but requires more digital lines.
How do the conversion speeds of the AD7890ARZ-10 and AD7899AR-3 compare?
The AD7890ARZ-10 has a conversion time of 10 µs, while the AD7899AR-3 has a conversion time of 2.2 µs. The AD7899AR-3 is significantly faster, which is consistent with its higher resolution and parallel interface architecture.
What are the analog input voltage ranges for the AD7890ARZ-10 and AD7899AR-3?
The AD7890ARZ-10 is specified with a ±10 V analog input range (the "-10" suffix denotes the ±10 V input range option). The AD7899AR-3 is specified with a ±3 V analog input range (the "-3" suffix denotes the ±3 V input range option). Designs must account for these different full-scale input ranges when selecting an ADC.
Can the AD7890ARZ-10 and AD7899AR-3 operate from the same supply voltage?
Both devices operate from a single +5 V supply for their analog and digital circuitry, per their respective manufacturer datasheets. However, because their input ranges, resolution, interface, and package differ, supply compatibility alone does not make them interchangeable.
In what applications would the AD7890ARZ-10 be preferred over the AD7899AR-3?
The AD7890ARZ-10 is preferred when multiple channels must be digitized with a single ADC, when a serial interface is required to conserve digital I/O, and when 12-bit resolution with a ±10 V input range is sufficient. The AD7899AR-3 is preferred when higher 14-bit resolution, faster 2.2 µs conversion, and a parallel interface are needed for a single channel with a ±3 V input range.