Part A
AD977ABRZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4556 ПКС
- Package
- SOIC-20
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977ABRZ and AD977AR are functionally equivalent 16-bit current-output DACs sharing the same resolution, architecture, and SOIC-28 package, making the AD977ABRZ a viable replacement candidate for the AD977AR. The primary distinction lies in the grade-level specification: the AD977ABRZ is specified for 16-bit monotonicity and tighter linearity over the full operating temperature range, while the AD977AR offers 16-bit resolution with relaxed grade specifications. Designers should confirm that the tighter DNL/INL and monotonicity guarantees of the AD977ABRZ align with their system accuracy budget before substituting.
Resolution
High match
Package Type
High match
Output Type
High match
Linearity Grade
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 | AD977ABRZ | AD977AR | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both converters provide 16-bit resolution, so quantization noise floor and dynamic range are equivalent. |
| Sampling Rate | 100 kSPS | 100 kSPS | Identical maximum throughput means either part supports the same signal bandwidth and system timing budget. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Both are single-channel ADCs, so channel count and input multiplexing requirements are unchanged. |
| Interface Type | Serial (SPI/QSPI compatible) | Serial (SPI/QSPI compatible) | Same serial interface allows drop-in compatibility with existing digital host connections. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Matching supply requirements mean the same power rail design can be reused. |
| Package / Mounting | 28-lead SOIC (surface mount) | 28-lead SOIC (surface mount) | Identical package and footprint enable physical board-level interchangeability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range ensures equivalent environmental qualification. |
| INL (Integral Nonlinearity) | ±3.0 LSB max | ±3.0 LSB max | Equivalent linearity specification means comparable accuracy performance in measurement applications. |
| Power Consumption | 100 mW typ | 100 mW typ | Same typical power draw keeps thermal and supply budgeting consistent between the two parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD977ABRZ | AD977AR |
|---|---|---|
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate (Per Second) | - | 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 |
| 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 |
| Mounting Type | - | Surface Mount |
| Base Product Number | - | AD977 |
| Sampling Rate(Per Second) | 200k | - |
| Number of A/D Converters | 1 | - |
Frequently asked questions
What are the key differences between the AD977ABRZ and the AD977AR?
The AD977ABRZ is the RoHS-compliant, lead-free (Pb-free) version of the AD977A in a 28-lead SOIC package, while the AD977AR is the non-RoHS leaded (SnPb) version of the same AD977A converter in the same 28-lead SOIC package. Both share the same core 16-bit, 100 kSPS ADC architecture and specified performance grades; the primary difference is package/lead finish and RoHS compliance status.
Are the AD977ABRZ and AD977AR functionally interchangeable in an existing design?
Functionally, both are AD977A 16-bit, 100 kSPS ADCs in a 28-lead SOIC with the same pinout and specified AC/DC performance, so they are electrically interchangeable. The AD977ABRZ is the Pb-free/RoHS-compliant variant, so it can be used where RoHS compliance is required, while the AD977AR is the leaded (SnPb) version. Substitution should still be validated against the manufacturer datasheet and the target assembly's soldering and compliance requirements.
What is the resolution and throughput of the AD977ABRZ and AD977AR?
Both devices are 16-bit analog-to-digital converters with a maximum throughput of 100 kSPS. These are the specified resolution and sampling rate for the AD977A family, to which both the AD977ABRZ and AD977AR belong.
Do the AD977ABRZ and AD977AR support the same analog input range and interface?
Yes. Both are AD977A-family parts and share the same analog input configuration and digital interface, including a parallel output interface and the ability to operate with a single +5 V supply. Because they are the same converter die in the same package, the analog input range and digital interface are identical between the two orderable part numbers.
What package do the AD977ABRZ and AD977AR use?
Both parts are supplied in a 28-lead SOIC (Small Outline Integrated Circuit) package. The "R" in both part numbers denotes the SOIC package option, and the "Z" suffix on the AD977ABRZ indicates the RoHS-compliant, Pb-free lead finish.
Which part should be selected for a RoHS-compliant assembly?
The AD977ABRZ should be selected for RoHS-compliant assemblies because the "Z" suffix designates the Pb-free, RoHS-compliant lead finish. The AD977AR uses a leaded (SnPb) finish and is not the RoHS-compliant option. Final selection should be confirmed against the manufacturer's ordering guide and the assembly's compliance requirements.
Are the AD977ABRZ and AD977AR the same performance grade?
Both are AD977A devices, and the "A" grade designation applies to both orderable part numbers. The suffix differences ("BRZ" vs "R") relate to package/lead finish and RoHS status rather than to a different specified performance grade. Designers should still verify the exact grade and specifications in the manufacturer datasheet for each orderable part number.