Part A
AD977ABRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4556 PCS
- Package
- SOIC-20
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977ABRZ is a higher-grade variant of the AD977ARZ, sharing the same 16-bit architecture, pinout, and package while offering improved linearity specifications. Both parts are functionally interchangeable in most designs, with the AD977ABRZ providing tighter INL and DNL performance for applications requiring enhanced accuracy.
Resolution and Architecture
High match
Package and Pinout
High match
Supply Voltage and Interface
High match
Linearity Grade
Validation required
Parts at a glance
Part B
AD977ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7094 PCS
- Package
- SOIC-20
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | AD977ARZ | AD977ABRZ | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both converters provide the same 16-bit resolution, so quantization accuracy is identical. |
| Number of ADC Inputs | 1 | 1 | Both are single-channel ADCs, so channel count is not a differentiator for substitution. |
| Sampling Rate | 100 kSPS | 100 kSPS | Identical maximum throughput means timing and signal bandwidth requirements are met equally. |
| Input Type | Single-ended | Single-ended | Same input configuration allows the same analog front-end design to be reused. |
| Architecture | SAR | SAR | Both use successive-approximation architecture, giving similar latency and no pipeline delay. |
| Reference Type | External, Internal | External, Internal | Both support internal or external reference, so reference design flexibility is unchanged. |
| Supply Voltage | 5 V (Analog and Digital) | 5 V (Analog and Digital) | Same supply requirements mean the power design does not need modification. |
| Interface | Parallel (SPI-compatible serial) | Parallel (SPI-compatible serial) | Identical digital interface options allow drop-in replacement in existing layouts. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Same temperature rating ensures equivalent environmental robustness. |
| Package / Mounting | 20-SOIC (Surface Mount) | 20-SOIC (Surface Mount) | Identical package and footprint enable direct board-level substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD977ABRZ | AD977ARZ |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 200k | 100k |
| 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 AD977ABRZ?
Both are 16-bit, 100 kSPS bipolar input ADCs from Analog Devices in a 28-lead SOIC package. The AD977ARZ is specified for operation over the industrial temperature range of −40°C to +85°C, while the AD977ABRZ is specified over the commercial temperature range of 0°C to +70°C. The core analog and digital performance specifications are otherwise the same.
Are the AD977ARZ and AD977ABRZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 28-lead SOIC (R-28) package with identical pin functions, so they share the same PCB land pattern and pinout. The difference is the temperature grade, not the package or pin configuration.
What is the resolution and throughput of the AD977ARZ and AD977ABRZ?
Both parts are 16-bit successive-approximation ADCs with a maximum throughput of 100 kSPS. They provide no missing codes to 16 bits and are designed for high-accuracy data acquisition applications.
What input voltage range do the AD977ARZ and AD977ABRZ support?
Both devices accept bipolar input ranges of ±10 V, ±5 V, and ±2.5 V, configured via external connections. They integrate an on-chip successive-approximation ADC, sample-and-hold, reference, and clock circuitry, reducing external component count.
Can the AD977ABRZ be used as a drop-in replacement for the AD977ARZ?
Functionally and pin-wise, yes, but the temperature grade differs. The AD977ABRZ is rated for 0°C to +70°C, whereas the AD977ARZ is rated for −40°C to +85°C. Substitution is acceptable only if the application's operating temperature range falls within the commercial grade limits and all other specifications are validated against the datasheet.
What interface do the AD977ARZ and AD977ABRZ provide?
Both devices provide a parallel 16-bit digital output interface with a standard microprocessor-compatible bus, allowing direct connection to DSPs and microcontrollers. Conversion results are available as a 16-bit word, and the parts support both read and convert start control signals.
Do the AD977ARZ and AD977ABRZ require an external reference?
No. Both devices include an on-chip reference, though an external reference can be used if higher accuracy or a different reference voltage is required. The internal reference is trimmed to provide specified performance without additional external components.
What are the power supply requirements for the AD977ARZ and AD977ABRZ?
Both devices operate from dual ±5 V analog supplies and a +5 V digital supply. Power consumption is typically in the range specified in the Analog Devices datasheet for the AD977 family, and both parts share the same supply and decoupling requirements.