Part A
AD977ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7094 PCS
- Package
- SOIC-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977ARZ and AD977AAR are functionally equivalent 16-bit current-output DACs sharing the same resolution, architecture, and package family, making the AD977AAR a viable replacement candidate for the AD977ARZ. Designers should confirm the grade-dependent specifications and verify the exact package and temperature suffix against the target application before final qualification.
Resolution and Architecture
High match
Package Type
High match
Output Type
High match
Grade and Temperature Range
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD977ARZ | AD977AAR | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both converters provide 16-bit resolution, so quantization granularity is identical for signal-chain design. |
| Sampling Rate | 100 kSPS | 100 kSPS | Maximum throughput determines the highest signal bandwidth the ADC can digitize without aliasing. |
| Input Type | Single-ended | Single-ended | Input configuration dictates the analog front-end topology and whether a differential driver is required. |
| Interface | Parallel (byte/word) | Parallel (byte/word) | The digital interface must match the host controller's bus width and timing to ensure correct data capture. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Supply requirements affect power-rail design and compatibility with surrounding logic levels. |
| Package / Mounting | 28-lead SOIC (surface mount) | 28-lead SSOP (surface mount) | Different package footprints require board layout changes and may affect thermal and assembly considerations. |
| Operating Temperature Range | -40 °C to +85 °C (industrial) | -40 °C to +85 °C (industrial) | The temperature grade determines suitability for industrial versus commercial environments. |
| INL (Integral Nonlinearity) | ±3 LSB max | ±3 LSB max | INL defines absolute accuracy and directly impacts measurement precision in data-acquisition systems. |
| Power Consumption | 100 mW typ | 100 mW typ | Power dissipation influences thermal design and is critical in power-sensitive or portable applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD977ARZ | AD977AAR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 200k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI |
| Configuration | ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | 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 AD977ARZ and AD977AAR?
The AD977ARZ and AD977AAR are both 16-bit, 100 kSPS analog-to-digital converters from Analog Devices. The primary difference is the package and temperature grade: the AD977ARZ is supplied in a 20-lead SOIC (R-20) package with an industrial temperature range of −40°C to +85°C, while the AD977AAR is supplied in a 28-lead SSOP (RS-28) package, also rated for −40°C to +85°C. Both share the same core converter architecture and specified performance.
Are the AD977ARZ and AD977AAR functionally interchangeable?
Functionally, both devices are 16-bit, 100 kSPS successive-approximation ADCs with the same analog input range and digital interface. However, they are not drop-in replacements because they use different packages (20-lead SOIC vs 28-lead SSOP) with different pin counts and PCB land patterns. A board redesign or adapter is required to substitute one for the other.
What is the resolution and throughput of the AD977ARZ and AD977AAR?
Both the AD977ARZ and AD977AAR are 16-bit successive-approximation analog-to-digital converters with a maximum throughput of 100 kSPS. These parameters are common to the AD977A family and are specified in the Analog Devices datasheet.
What analog input range do the AD977ARZ and AD977AAR support?
Both devices accept a bipolar analog input range of ±10 V, with the input configured via the RIN pin and external resistors. The ±10 V range is the standard specified input span for the AD977A family per the Analog Devices datasheet.
What digital interface do the AD977ARZ and AD977AAR provide?
Both parts provide a parallel digital output interface with 16 data bits, along with standard control signals including CS, R/C, and BUSY. The interface is compatible with microprocessors and DSPs, and the conversion result is available as a 16-bit parallel word.
Do the AD977ARZ and AD977AAR differ in temperature grade or package?
Yes. The AD977ARZ uses a 20-lead SOIC package, while the AD977AAR uses a 28-lead SSOP package. Both are specified over the industrial temperature range of −40°C to +85°C. The package difference is the main distinction relevant to board layout and assembly.
What is the power supply requirement for the AD977ARZ and AD977AAR?
Both devices operate from a single +5 V analog supply and a +5 V digital supply, as specified in the Analog Devices AD977A datasheet. Power consumption is typically in the range of 100 mW, consistent with the AD977A family specifications.