Part A
AD977ABRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4556 Stückzahl
- Package
- SOIC-20
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977ACR is a viable functional replacement candidate for the AD977ABRZ, sharing identical core architecture, resolution, and package configuration, with the primary distinction being a tighter INL grade on the ACR variant. Designers should confirm that the improved linearity specification and any associated settling behavior align with their system accuracy budget before substituting.
Resolution and Architecture
High match
Package Type
High match
Integral Nonlinearity Grade
Validation required
Supply and Interface
High match
Parts at a glance
Part B
AD977ACR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 18 Stückzahl
- Package
- SOIC-20
- 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 | AD977ABRZ | AD977ACR | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both converters offer 16-bit resolution, so quantization noise floor and dynamic range are equivalent for signal-chain budgeting. |
| Sampling Rate | 100 kSPS | 100 kSPS | Identical maximum throughput means either part supports the same Nyquist bandwidth and timing budget in the application. |
| INL (Integral Nonlinearity) | ±2.0 LSB max | ±1.0 LSB max | The A-grade offers tighter linearity, which directly improves absolute accuracy and reduces calibration effort in precision measurement designs. |
| DNL (Differential Nonlinearity) | ±1.0 LSB max | ±1.0 LSB max | Equal DNL guarantees no missing codes to 16 bits for both grades, so monotonicity performance is the same. |
| Input Voltage Range | ±10 V (bipolar) | ±10 V (bipolar) | Same full-scale input span allows identical front-end signal conditioning and reference design without rework. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Matching single 5 V supply rails means the power architecture and decoupling scheme can be reused unchanged. |
| Interface Type | Parallel (byte/word) | Parallel (byte/word) | Identical parallel interface simplifies drop-in replacement at the digital bus level without firmware or glue-logic changes. |
| Package / Mounting | 28-lead SOIC (R-28) | 28-lead SOIC (R-28) | Same package and footprint enables direct board-level substitution with no layout modification. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent industrial temperature range means both parts suit the same environmental conditions and derating assumptions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD977ABRZ | AD977ACR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 200k | 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 AD977ABRZ and the AD977ACR?
Both are 16-bit, 100 kSPS analog-to-digital converters from Analog Devices in a 28-lead SOIC package. The primary difference is the grade specification: the AD977ABRZ is specified for ±2 LSB INL (B grade), while the AD977ACR is specified for ±3 LSB INL (C grade). Both share the same functional architecture, pinout, and package.
Are the AD977ABRZ and AD977ACR 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 are pin-to-pin and package-compatible. Board-level substitution is possible without layout changes.
What is the resolution and throughput of these converters?
Both the AD977ABRZ and AD977ACR are 16-bit successive-approximation ADCs with a maximum throughput of 100 kSPS. They operate from a single +5 V supply and include an internal reference and a parallel interface.
Can the AD977ACR be used as a drop-in replacement for the AD977ABRZ?
Functionally and mechanically yes, since both share the same pinout and package. However, the C grade has a wider INL specification (±3 LSB vs ±2 LSB for the B grade), so the replacement should be validated against the accuracy requirements of the target design before use.
Do both parts have the same operating temperature range?
Yes. Both the AD977ABRZ and AD977ACR are specified over the industrial temperature range of −40°C to +85°C, as indicated by the "R" package and industrial grade designation in the ordering code.
What does the "Z" suffix in AD977ABRZ indicate compared to AD977ACR?
The "Z" suffix denotes RoHS-compliant packaging per Analog Devices' ordering nomenclature. The AD977ACR ordering code does not carry the Z suffix, so the AD977ABRZ is the RoHS-compliant variant while the AD977ACR reflects the non-Z ordering designation.
Do both converters support the same digital interface and reference configuration?
Yes. Both devices provide a parallel digital output interface and include an on-chip reference with the ability to use an external reference. The internal architecture, conversion timing, and control signals are identical across the B and C grades.