Part A
AD977ABRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4556 個数
- Package
- SOIC-20
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The AD977ABRZ and AD977CR share the same 16-bit SAR ADC architecture, pin-compatible 28-lead SOIC package, and identical analog input configuration, making the AD977CR a viable functional substitute for the AD977ABRZ in most designs. The primary distinction is dynamic performance: the AD977CR offers a higher maximum sampling rate and tighter INL and SNR specifications, so it can serve as a performance upgrade while remaining form-factor and interface compatible. Designers should confirm timing margins and power budget against the target application before final qualification.
Resolution and Architecture
High match
Package and Pinout
High match
Sampling Rate
Validation required
Dynamic Performance
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 | AD977CR | 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. |
| Input Type | Single-ended | Single-ended | Same input configuration allows direct substitution without redesigning the analog front end. |
| Interface | Parallel (byte/word) | Parallel (byte/word) | Matching parallel interface ensures the same digital host connection and timing can be reused. |
| Supply Voltage | 5 V | 5 V | Same analog and digital supply requirements simplify power rail design and compatibility. |
| Package / Mounting | 28-SOIC (surface mount) | 28-SOIC (surface mount) | Identical package and footprint permit drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | 0 °C to +70 °C | The wider industrial range of the AD977ABRZ allows use in harsher environments where the commercial-grade AD977CR may not be rated. |
| INL (Integral Nonlinearity) | ±2.0 LSB max | ±2.0 LSB max | Equivalent linearity specification indicates comparable accuracy and distortion performance in the target application. |
| Power Consumption | 100 mW typ | 100 mW typ | Same typical power draw keeps thermal and supply budgeting unchanged when substituting parts. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD977ABRZ | AD977CR |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 200k | 100k |
| Data Interface | SPI | SPI |
| Number of A/D Converters | 1 | 1 |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Number of Inputs | 1 | - |
| Input Type | Single Ended | - |
| Configuration | ADC | - |
| Architecture | SAR | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 5V | - |
| Voltage - Supply, Digital | 5V | - |
Frequently asked questions
What are the key differences between the AD977ABRZ and the AD977CR?
Both are 16-bit, 100 kSPS analog-to-digital converters from Analog Devices in a 28-lead SOIC package. The AD977ABRZ is the A-grade version with a maximum INL of ±3 LSB, while the AD977CR is the C-grade version with a maximum INL of ±1 LSB. The AD977CR therefore offers tighter linearity, while both share the same resolution, throughput, and package footprint.
Are the AD977ABRZ and AD977CR 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-compatible and can share the same PCB land pattern. Electrical grade differences do not change the pinout.
Can the AD977CR be used as a drop-in replacement for the AD977ABRZ?
In most designs the AD977CR can replace the AD977ABRZ because it is pin-compatible and has equal or better linearity (INL ±1 LSB vs ±3 LSB). However, the replacement should be validated against the target design's accuracy, timing, and power requirements using the respective datasheets before substitution.
What is the resolution and throughput of the AD977ABRZ and AD977CR?
Both parts are 16-bit successive-approximation ADCs with a maximum throughput of 100 kSPS. Resolution and sampling rate are identical across the A and C grades.
Do the AD977ABRZ and AD977CR differ in power consumption?
Both devices operate from a single 5 V supply and are specified with the same typical power dissipation of approximately 100 mW. Power consumption is not a differentiating parameter between the A and C grades.
What analog input range do the AD977ABRZ and AD977CR support?
Both converters accept a bipolar analog input range of ±10 V (with a 5 V reference), configured via the input range pin. The input range configuration is the same for both grades.
What interface do the AD977ABRZ and AD977CR provide?
Both parts provide a parallel 16-bit digital output interface with a standard microprocessor-compatible read/write timing, allowing direct connection to a host bus. The digital interface is identical between the two grades.
Which grade should be selected for a high-accuracy application?
For applications requiring tighter integral nonlinearity, the AD977CR is the appropriate choice because its maximum INL is ±1 LSB versus ±3 LSB for the AD977ABRZ. Where ±3 LSB INL is acceptable, the AD977ABRZ may be used.