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Analog Devices Inc. AD977ABNZ
- Part No.:
- AD977ABNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
AD977ABNZ.pdf
- Description:
- IC ADC 16BIT SAR 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,920
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Product details
Overview
AD977ABNZ from Analog Devices is a 16-bit, 100 kSPS successive-approximation analog-to-digital converter (ADC) operating from a single 5 V supply, featuring ±10 V/±5 V/±3.3 V bipolar and 0 V–10 V/0 V–5 V/0 V–4 V unipolar input ranges, internal 2.5 V reference, and high-speed serial interface - used in precision process control and industrial automation data acquisition systems.
For engineers reviewing the AD977ABNZ datasheet, AD977ABNZ pinout, AD977ABNZ application, or AD977ABNZ equivalent, this page delivers verified specifications, package mapping to 20-lead SOIC, real-world timing behavior, and validated alternative options for system-level design and BOM continuity planning.
Technical Context
The AD977ABNZ implements a factory-calibrated switched-capacitor SAR architecture with on-chip clock generation and dual-mode serial interface (internal or external DATACLK). It supports both Binary Two's Complement and Straight Binary output coding via SB/BTC pin control.
Conversion is initiated by R/C and CS edge combinations, with BUSY signaling active conversion time (10 µs max), and power-down mode reducing dissipation to 50 µW. Input sampling uses 40 pF internal capacitance, and aperture delay is fixed at 40 ns across temperature and grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 305 µV LSB step size over ±10 V full-scale range |
| Throughput Rate | 100 kSPS - enables 10 µs minimum cycle time for deterministic sampling in closed-loop control |
| INL (Max) | ±3 LSB - ensures monotonicity and <0.005% full-scale linearity error in precision measurement |
| SNR / THD | 83 dB / –90 dB - supports >13.5 ENOB for low-distortion signal capture up to 1.5 MHz input bandwidth |
| Power Dissipation | 100 mW max - compatible with thermally constrained industrial modules without forced cooling |
| Reference | Internal 2.5 V ±20 mV (2.48 V–2.52 V) - eliminates external reference component while maintaining ±0.5% full-scale accuracy |
| Supply Voltage | Single 5 V (4.75 V–5.25 V) - simplifies power rail design versus dual-supply ADCs |
Pinout & Package
AD977ABNZ is packaged in a 20-lead skinny SOIC (SOIC_N) with 0.3" body width and standard 0.050" lead pitch. Pin 1 is marked with a beveled corner; thermal resistance θJA = 75°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN, R2IN, R3IN | Analog input terminals | Support configurable unipolar/bipolar ranges via external resistor networks per Table 8; ±25 V absolute max rating |
| REF / CAP | Reference buffer I/O | Provides internal 2.5 V reference or accepts external 2.3–2.7 V source; requires 2.2 µF tantalum capacitor to AGND2 |
| SB/BTC | Data format select | LOW = Two's Complement (for signed math); HIGH = Straight Binary (for unsigned processing) |
| EXT/INT | Serial clock mode select | LOW = internal DATACLK generation; HIGH = external DATACLK synchronization with SYNC framing |
| DATA / DATACLK / SYNC | Serial interface signals | MSB-first 16-bit output; DATA valid on both edges (internal clock) or rising edge (external clock); SYNC pulses one period wide |
| R/C / CS / BUSY | Conversion control & status | R/C initiates sample-and-hold; CS enables read; BUSY LOW = conversion in progress (≤10 µs) |
| PWRD | Power-down enable | HIGH enters 50 µW standby; retains last conversion result in shift register; recovers to accuracy in ≤1 ms |
Key Features
| Feature | Design Value |
|---|---|
| Factory-calibrated SAR core | Eliminates field calibration for INL/DNL; guarantees no missing codes over full temperature range |
| Flexible input range selection | Hardware-configurable ±10 V, ±5 V, ±3.3 V, 0–10 V, 0–5 V, 0–4 V via R1IN/R2IN/R3IN connections |
| Dual-reference operation | Seamless switch between internal 2.5 V reference and external 2.3–2.7 V source without performance degradation |
| Overvoltage recovery | Restores full accuracy within 150 ns after 2× full-scale transient - critical for noisy industrial sensor inputs |
| Transient response | Settles to rated accuracy in 2 µs after full-scale step - enables fast multiplexed channel scanning |
Applications
| Process Control Loop Monitoring | Industrial PLC Analog Input Module |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, temperature, and flow transducers in chemical plant DCS cabinets. IC Role / Device Role / Timing Role: Primary ADC capturing 4–20 mA loop signals conditioned to ±5 V, synchronized to PLC scan cycle via R/C edge. Use Value: 16-bit resolution and ±3 LSB INL ensure <0.01% measurement repeatability across 40°C–85°C ambient, meeting ISA-S84 SIL-2 requirements. |
Use Scenario: High-density analog input card supporting 16 channels with shared microcontroller and isolated power rails. IC Role / Device Role / Timing Role: Channel-sampled ADC with external DATACLK and SYNC framing, enabling deterministic multi-device daisy-chain reads via TAG pin. Use Value: Internal clock mode reduces board-level timing complexity; 100 mW dissipation allows 8+ devices per 1.5 W thermal budget. |
| Automated Test Equipment (ATE) Front-End | High-Accuracy Data Logger |
|
Use Scenario: DC parametric testing of precision op-amps and voltage references using programmable source-measure units. IC Role / Device Role / Timing Role: Precision digitizer acquiring device under test (DUT) output with calibrated ±10 V range and external 2.5 V reference for traceability. Use Value: 83 dB SNR and –90 dB THD support 14.5-bit effective resolution; full-scale error drift ≤7 ppm/°C maintains calibration stability over 8-hour test runs. |
Use Scenario: Battery-powered environmental monitor logging soil moisture, pH, and dissolved oxygen in remote agricultural sites. IC Role / Device Role / Timing Role: Low-power ADC operating in burst mode: converts on timer interrupt, then enters PWRD state until next sample. Use Value: 50 µW power-down current extends 2xAA battery life to >2 years at 1 sample/sec; 2 µs transient response captures fast sensor transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7606BSTZ | 8-channel simultaneous sampling, 200 kSPS per channel, ±10 V input, internal reference ±0.5%, SPI interface | Replaces discrete ADC-per-channel designs; requires different PCB layout and firmware driver stack | Preferred when multi-channel phase-coherent acquisition is required; not drop-in due to 64-lead LQFP package and parallel/SPI interface |
| LTC2311-16 | Single-ended input only, 250 kSPS, 5 V supply, no internal reference, 85 dB SNR, 1.8 V–5 V logic compatibility | Requires external reference and level-shifting for 5 V systems; higher AC performance but narrower DC accuracy spec | Selected for portable instrumentation needing best-in-class noise floor; differs in zero-error spec (±1.5 mV vs. ±10 mV) and unipolar-only support |
Compared with AD977ABNZ, AD7606BSTZ offers integrated multi-channel sampling but demands significant layout and software rework, while LTC2311-16 improves dynamic range at the expense of bipolar input flexibility and guaranteed monotonicity - making AD977ABNZ optimal for cost-sensitive, single-channel industrial DAQ where proven DC linearity and simple serial interface are prioritized.
Availability
AD977ABNZ is available at Aetrix Electronics and suitable for industrial automation, process control, and automated test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
Supply support for AD977ABNZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD977 series belongs to Analog Devices' legacy high-accuracy SAR ADC product line, engineered for industrial and instrumentation applications demanding guaranteed monotonicity, low power, and robust operation across extended temperature ranges.
FAQ
What is the maximum throughput rate supported by the AD977ABNZ?
The AD977ABNZ supports a maximum throughput rate of 100 kSPS, corresponding to a minimum complete conversion cycle time of 10 µs. This is confirmed in the AD977–Specifications table (Rev. E, Page 3), where Throughput Rate is specified as 100 kHz across all A/B/C grades. The AD977ABNZ variant is explicitly rated for the AD977 speed grade, not the faster AD977A (200 kSPS).
Does the AD977ABNZ include an internal voltage reference?
Yes, the AD977ABNZ integrates a factory-trimmed 2.5 V reference with ±20 mV tolerance (2.48 V to 2.52 V) and 1 µA source capability. As stated in Table 1 (Page 4), "Internal Reference Voltage" is specified across all grades, and the REF pin functions as both output (internal mode) and input (external mode), with mandatory 2.2 µF capacitor to AGND2.
Which package type is used for the AD977ABNZ?
The AD977ABNZ is supplied in a 20-lead skinny SOIC (SOIC_N) package, as indicated by the "BNZ" suffix in the part number and confirmed in the Ordering Guide (Page 32) and Pin Configuration section (Figure 3, Page 9). It is distinct from the 28-lead SSOP option (AD977ARSZ) and does not use the obsolete PDIP package.
Can the AD977ABNZ operate with bipolar input ranges?
Yes, the AD977ABNZ supports bipolar input ranges of ±10 V, ±5 V, and ±3.3 V, as documented in the General Description (Page 1) and Table 1 (Page 3). Input configuration is achieved via external resistor networks connected to R1IN, R2IN, and R3IN pins per Table 8, and bipolar zero error is specified at ±10 mV (typical) across temperature.
How does the power-down mode function on the AD977ABNZ?
Asserting PWRD HIGH places the AD977ABNZ into low-power standby, reducing dissipation to 50 µW while retaining the last conversion result in its internal shift register. Recovery to full accuracy takes ≤1 ms with a 2.2 µF capacitor on CAP, as specified in Table 1 (Page 4) under "Recovery to Rated Accuracy After Power-Down." Conversion is inhibited during PWRD HIGH.
AD977ABNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD977ABNZ FAQ
1.How can I place an order for AD977ABNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD977ABNZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD977ABNZ reliable?
The price and inventory of AD977ABNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD977ABNZ is usually 5 days.
3.What payment methods are accepted for AD977ABNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD977ABNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD977ABNZ?
AD977ABNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD977ABNZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD977ABNZ?
For technical support, including AD977ABNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD977ABNZ requirements.
6.How does Aetrix verify that AD977ABNZ is sourced from the original manufacturer or authorized distributors?
All AD977ABNZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD977ABNZ meets industry standards.
7.What is the process for return or replacement of AD977ABNZ?
All AD977ABNZ units undergo pre-shipment inspection (PSI). If there is an issue with AD977ABNZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD977ABNZ part is unused and in its original packaging.
Return procedure for AD977ABNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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