Part A
AD977ABRZ
Công ty Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4556 PCS
- Package
- SOIC-20
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977BRRL is a functionally compatible replacement candidate for the AD977ABRZ, sharing the same 16-bit SAR ADC architecture, 100 kSPS throughput, and 20-pin SOIC package. Both parts are pin-compatible and differ primarily in specified grade and packaging format, so the substitution is viable for most designs pending confirmation of the required accuracy grade and operating temperature range.
Resolution and Architecture
High match
Package Type
High match
Accuracy Grade
Validation required
Operating 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 | AD977ABRZ | AD977BRRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both converters provide the same 16-bit resolution, so quantization accuracy is equivalent. |
| Number of ADC Inputs | 1 | 1 | Single-channel architecture in both parts means the same signal chain topology can be used. |
| Sampling Rate | 100 kSPS | 100 kSPS | Identical maximum throughput allows the same system timing and anti-aliasing design. |
| Input Type | Single-ended | Single-ended | Same input configuration means the analog front-end can remain unchanged. |
| Interface | SPI / Serial | SPI / Serial | Matching serial interface ensures digital host compatibility without firmware changes. |
| Supply Voltage | 5 V | 5 V | Same supply requirement allows reuse of the existing power rail design. |
| Reference Type | External / Internal | External / Internal | Both support internal or external reference, preserving reference circuit flexibility. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean the same environmental qualification applies. |
| Package / Mounting | 20-SOIC (Surface Mount) | 20-SOIC (Surface Mount) | Same package and footprint allow direct board-level drop-in replacement. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD977ABRZ | AD977BRRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| 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 AD977ABRZ and AD977BRRL?
Both are 16-bit, 100 kSPS analog-to-digital converters from Analog Devices in the same functional family, but they differ in grade and packaging. The AD977ABRZ is the A-grade version supplied in a 20-lead SOIC (R-20) tube/tray format, while the AD977BRRL is the B-grade version supplied in a 20-lead SOIC in tape-and-reel packaging (RL suffix). The B grade offers tighter specified linearity and accuracy limits than the A grade per the AD977 datasheet.
Are the AD977ABRZ and AD977BRRL pin-compatible?
Yes. Both devices are offered in the same 20-lead SOIC (R-20) package with an identical pinout as defined in the AD977 datasheet, so they are pin-compatible when the package option matches.
Can the AD977BRRL be used as a drop-in replacement for the AD977ABRZ?
In most designs the B grade can replace the A grade because the package and pinout are identical and the B grade meets or exceeds the A-grade specifications. However, the replacement should be validated against the target design's accuracy, timing, and power requirements using the AD977 datasheet, and the tape-and-reel packaging difference should be confirmed against the assembly process.
What resolution and throughput do the AD977ABRZ and AD977BRRL provide?
Both are 16-bit successive-approximation ADCs with a maximum throughput of 100 kSPS, as specified in the AD977 datasheet.
What analog input range and reference configuration do these converters support?
The AD977 family accepts a bipolar analog input range of ±10 V (with a 5 V reference and the specified input configuration) and supports an external reference; the datasheet defines the exact reference and input-span options. Designers should confirm the reference and input configuration against the AD977 datasheet for the selected grade.
What supply voltages and interface does the AD977ABRZ and AD977BRRL require?
Both devices operate from a +5 V analog supply and a +5 V digital supply and provide a parallel digital output interface, per the AD977 datasheet. The exact supply tolerances and timing should be taken from the datasheet.
How do the A and B grades differ in specified performance?
The B grade (AD977BRRL) is specified with tighter limits on key parameters such as integral nonlinearity (INL), differential nonlinearity (DNL), and gain/offset error than the A grade (AD977ABRZ). The precise grade-specific limits are listed in the AD977 datasheet's order guide and specifications tables.
What packaging options distinguish the AD977ABRZ from the AD977BRRL?
The AD977ABRZ is supplied in the 20-lead SOIC (R-20) in standard tube/tray quantities, while the AD977BRRL is the same 20-lead SOIC supplied in tape-and-reel (the "RL" suffix denotes reel packaging). Both use the same package body and pinout.