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 AD977BRRL is a functionally compatible replacement candidate for the AD977ARZ, sharing the same 16-bit resolution, 100 kSPS sampling rate, and 20-pin SOIC package. The primary distinction is the grade-level specification: the AD977BRRL offers tighter INL and DNL performance over the industrial temperature range, making it suitable where improved linearity is required, while the AD977ARZ remains adequate for standard-grade applications. Verify the target board's accuracy budget and operating temperature requirements before substituting.
Resolution
High match
Sampling Rate
High match
Package Type
High match
INL/DNL 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 | AD977ARZ | AD977BRRL | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both converters provide 16-bit resolution, so quantization granularity is identical for either part. |
| Sampling Rate | 100 kSPS | 100 kSPS | Maximum throughput determines the highest signal bandwidth the system can digitize; both parts support the same 100 kSPS rate. |
| INL (Integral Nonlinearity) | ±2.0 LSB max | ±1.0 LSB max | INL directly affects absolute accuracy and linearity; the B-grade offers tighter linearity, which can matter for precision measurement applications. |
| DNL (Differential Nonlinearity) | ±1.0 LSB max | ±1.0 LSB max | DNL guarantees monotonicity and no missing codes; both grades specify the same ±1 LSB maximum. |
| Input Type | Single-ended | Single-ended | Input configuration determines the analog front-end design; both accept single-ended signals, so the interface circuitry is interchangeable. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Supply requirements dictate power rail design; both parts operate from a single 5 V supply, allowing drop-in replacement. |
| Interface | Parallel (byte/word) | Parallel (byte/word) | The digital interface must match the host controller; both provide a parallel byte/word interface, so no firmware change is needed. |
| Package / Mounting | 28-lead SOIC (surface mount) | 28-lead SOIC (surface mount) | Package and footprint compatibility enable direct board-level substitution without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range defines the environments in which the part is guaranteed to meet specifications; both cover the industrial range. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD977ARZ | AD977BRRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 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 AD977BRRL?
Both are 16-bit, 100 kSPS bipolar input ADCs from Analog Devices in a 28-lead SOIC package. The AD977ARZ is the A-grade version with a maximum INL of ±3.0 LSB, while the AD977BRRL is the B-grade version with a maximum INL of ±2.0 LSB. The BRRL suffix indicates tape-and-reel packaging, whereas the ARZ suffix indicates tube packaging. Both are specified over the industrial temperature range of −40°C to +85°C.
Are the AD977ARZ and AD977BRRL pin-compatible and functionally interchangeable?
Yes. Both parts share the same 28-lead SOIC footprint, pinout, and functional architecture (16-bit successive-approximation ADC with internal reference and parallel interface). They differ only in linearity grade and packaging format, so they are pin-compatible and can be interchanged on the same PCB, provided the system's accuracy budget accommodates the A-grade's ±3.0 LSB INL versus the B-grade's ±2.0 LSB INL.
What is the resolution and throughput of the AD977ARZ and AD977BRRL?
Both devices are 16-bit successive-approximation ADCs with a maximum throughput of 100 kSPS. They feature a bipolar input range of ±10 V and an on-chip reference, and they provide a parallel 16-bit output interface.
What are the INL specifications for the AD977ARZ and AD977BRRL?
The AD977ARZ (A grade) has a maximum integral nonlinearity of ±3.0 LSB. The AD977BRRL (B grade) has a maximum integral nonlinearity of ±2.0 LSB. Both specifications apply over the full industrial temperature range of −40°C to +85°C.
What package and packaging options do the AD977ARZ and AD977BRRL use?
Both parts are offered in a 28-lead SOIC package. The AD977ARZ suffix denotes tube packaging, while the AD977BRRL suffix denotes tape-and-reel packaging suitable for automated assembly. The package body, pinout, and thermal characteristics are identical between the two order codes.
What is the operating temperature range for the AD977ARZ and AD977BRRL?
Both the AD977ARZ and AD977BRRL are specified for the industrial temperature range of −40°C to +85°C. All datasheet parametric limits, including INL, DNL, and gain/offset errors, are guaranteed across this range.
Can the AD977BRRL be used as a drop-in replacement for the AD977ARZ in an existing design?
Yes, from a footprint and functional standpoint, since both are 28-lead SOIC devices with identical pinouts and 100 kSPS throughput. The B-grade offers tighter INL (±2.0 LSB vs ±3.0 LSB), so substituting the BRRL for the ARZ generally improves or maintains accuracy. The reverse substitution (ARZ for BRRL) should only be done if the design's error budget tolerates the wider ±3.0 LSB INL. Verify against the latest Analog Devices datasheet before production release.