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Analog Devices Inc. AD977CRZ
- Part No.:
- AD977CRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD977CRZ.pdf
- Description:
- IC ADC 16BIT SAR 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,070
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Product details
Overview
AD977CRZ from Analog Devices is a 16-bit, 100 kSPS successive-approximation ADC operating from a single 5 V supply, featuring internal 2.5 V reference, ±10 V/0 V–5 V input ranges, and high-speed serial interface in a 20-lead SOIC package. It delivers ±3 LSB INL, 83 dB SNR, and 100 mW max power dissipation for precision data acquisition in industrial instrumentation.
For engineers reviewing the AD977CRZ datasheet, AD977CRZ pinout, AD977CRZ application, or AD977CRZ equivalent, key selection considerations include unipolar/bipolar input flexibility, internal vs. external reference support, power-down mode (50 µW), and compatibility with microprocessor serial interfaces requiring MSB-first two's complement or straight binary output.
Technical Context
The AD977CRZ implements a factory-calibrated switched-capacitor SAR architecture with on-chip clock generation and dual-mode serial interface (internal or external DATACLK). Its conversion control relies on R/C and CS signals, supporting both continuous and discontinuous clocking with SYNC frame synchronization when EXT/INT = HIGH.
It supports configurable analog input ranges (±10 V, ±5 V, ±3.3 V, 0 V–10 V, 0 V–5 V, 0 V–4 V) via external resistor networks, and includes aperture delay of 40 ns, transient response of 2 µs, and overvoltage recovery of 150 ns after 2×FS input - all specified across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 305 µV LSB step size at ±10 V full scale for high-precision measurement resolution. |
| Throughput Rate | 100 kSPS - enables real-time sampling of signals up to 700 kHz full-power bandwidth without aliasing in closed-loop control. |
| INL (Max) | ±3 LSB - ensures monotonicity and <0.05% end-point linearity error for calibration-critical sensor interfacing. |
| SNR | 83 dB (typ) - supports >13.5 effective number of bits (ENOB) in low-noise signal chains with anti-alias filtering. |
| Power Dissipation | 100 mW max - allows thermal design within SOIC package limits (θJA = 75°C/W) without forced cooling. |
| Reference | Internal 2.48–2.52 V or external 2.3–2.7 V - provides stable scaling without external voltage reference ICs unless higher accuracy is required. |
| Supply Voltage | 4.75–5.25 V (VANA/VDIG) - compatible with standard 5 V logic rails and tolerant of ±5% regulation variation. |
Pinout & Package
AD977CRZ is packaged in a 20-lead narrow-body SOIC (SOIC_N) with 0.3" body width and 0.050" lead pitch. Pin 1 is marked with a beveled corner or dot; leads are gull-wing formed for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| R1IN, R2IN, R3IN | Analog Input Terminals | Accept differential or single-ended inputs; configuration determines bipolar/unipolar range via external resistor network per Table 8. |
| CAP | Reference Buffer Output | Requires 2.2 µF tantalum capacitor to AGND2 to stabilize internal reference buffer; critical for DC accuracy stability. |
| REF | Reference I/O | Supplies internal 2.5 V reference or accepts external 2.3–2.7 V source; must be decoupled with 2.2 µF to AGND2. |
| SB/BTC | Data Format Select | LOW = two's complement output; HIGH = straight binary - defines interpretation of MSB in host firmware. |
| EXT/INT | Serial Clock Mode Select | LOW = internal DATACLK generation; HIGH = external DATACLK sync - determines timing control responsibility (ADC vs. host MCU). |
| SYNC | Frame Sync Output | Active-high pulse (1 DATACLK period wide) issued at start of read sequence when EXT/INT = HIGH - enables multi-device daisy-chaining. |
| DATA | Serial Data Output | MSB-first 16-bit result; level held at TAG state between conversions; valid on both edges of DATACLK in internal-clock mode. |
| PWRD | Power-Down Control | HIGH = 50 µW standby; conversion inhibited but last result retained in shift register - enables rapid wake-up without re-initialization. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-Calibrated SAR Core | Eliminates need for system-level INL/DNL calibration; guarantees ±3 LSB INL and no missing codes over temperature. |
| Flexible Input Ranging | Hardware-configurable ±10 V, ±5 V, ±3.3 V, 0 V–10 V, 0 V–5 V, 0 V–4 V ranges via external resistors - reduces BOM count across product variants. |
| High-Speed Serial Interface | 16-bit MSB-first output with selectable data format (two's complement/straight binary) and dual-clock mode - simplifies FPGA/MCU integration without parallel bus overhead. |
| Low-Power Power-Down Mode | 50 µW quiescent power with retained conversion result - ideal for battery-powered DAQ systems requiring intermittent sampling. |
| Robust Overvoltage Recovery | 150 ns recovery to full accuracy after 2× full-scale overvoltage - protects measurement integrity during transient events in industrial environments. |
Applications
| Process Control Sensor Interface | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: High-accuracy analog monitoring of pressure, temperature, and flow transducers in PLC-based control cabinets. IC Role / Device Role / Timing Role: Primary 16-bit digitizer capturing slow-varying industrial signals at ≤100 kSPS with calibrated linearity and low drift. Use Value: ±3 LSB INL and ±7 ppm/°C full-scale drift ensure long-term calibration stability without field recalibration. | Use Scenario: DC parametric testing of semiconductor devices requiring precise voltage/current measurements under programmable stimulus. IC Role / Device Role / Timing Role: Precision front-end ADC in fixture-mounted measurement modules interfaced to test controller via serial link. Use Value: Internal 2.5 V reference and 83 dB SNR enable sub-mV resolution on ±10 V ranges without external reference components. |
| Bipolar Signal Acquisition | Legacy System Retrofit |
Use Scenario: Digitizing AC-coupled audio, vibration, or motor phase currents with symmetrical positive/negative excursions. IC Role / Device Role / Timing Role: Bipolar-input ADC configured for ±5 V or ±10 V range, using R1IN/R2IN/R3IN pins with matched resistor dividers. Use Value: ±10 mV bipolar zero error and ±2 ppm/°C drift maintain null-point accuracy across ambient temperature swings. | Use Scenario: Replacing aging 12-bit ADCs in installed base of industrial controllers where board space and pinout constraints limit redesign options. IC Role / Device Role / Timing Role: Drop-in upgrade path leveraging same SOIC-20 footprint and 5 V supply, with enhanced resolution and serial interface compatibility. Use Value: Identical pinout and logic-level compatibility with legacy microcontrollers eliminates PCB revision while doubling effective resolution. |
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 |
|---|---|---|---|
| AD7606C-16 | 8-channel simultaneous-sampling, 1 MSPS, internal reference, SPI interface; requires external power sequencing. | Multi-channel synchronized acquisition vs. single-channel high-DC-accuracy focus of AD977CRZ. | Select AD7606C-16 when channel count and throughput outweigh absolute INL/zero-error specs. |
| ADS8860 | 16-bit, 1 MSPS, pseudo-differential input, external reference only, SPI, 1.8 V I/O; lower power (14 mW). | High-speed portable instrumentation vs. industrial-grade DC stability and bipolar input support. | Select ADS8860 when system uses low-voltage logic and prioritizes speed/power over ±10 V bipolar operation. |
Compared with AD7606C-16 and ADS8860, the AD977CRZ uniquely balances single-channel 100 kSPS throughput with factory-calibrated ±3 LSB INL, integrated bipolar/unipolar ranging, and robust 5 V operation - making it optimal for retrofit and calibration-sensitive industrial DAQ where simplicity and proven long-term stability are critical.
Availability
AD977CRZ is available at Aetrix Electronics and suitable for process control, automated test equipment, and industrial sensor interface applications requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.
Supply support for AD977CRZ 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD977 family was designed specifically for high-accuracy, low-power, single-supply data acquisition in space- and cost-constrained industrial instrumentation - emphasizing factory-calibrated linearity, flexible input ranging, and simplified serial interfacing.
FAQ
What input voltage ranges does the AD977CRZ support?
The AD977CRZ supports bipolar input ranges of ±10 V, ±5 V, and ±3.3 V, and unipolar ranges of 0 V–10 V, 0 V–5 V, and 0 V–4 V. Range selection is achieved via external resistor networks connected to R1IN, R2IN, and R3IN pins as defined in Table 8 of the AD977/AD977A datasheet. The AD977CRZ maintains specified INL and zero-error performance across all supported ranges.
Does the AD977CRZ require an external reference voltage?
No, the AD977CRZ includes an internal 2.5 V reference (2.48 V to 2.52 V) that can be used directly by connecting REF to CAP and decoupling both to AGND2 with a 2.2 µF tantalum capacitor. An external reference between 2.3 V and 2.7 V may be applied to REF if higher accuracy or temperature stability is required. The AD977CRZ operates correctly with either option.
How does the power-down mode function on the AD977CRZ?
When the PWRD pin is driven HIGH, the AD977CRZ enters power-down mode, reducing power dissipation to 50 µW while retaining the last conversion result in its internal shift register. Conversions are inhibited, but the device wakes up in <1 ms upon PWRD going LOW, with full accuracy restored after 1 ms (with 2.2 µF capacitor on CAP). This behavior is fully characterized and guaranteed in the AD977CRZ datasheet.
What is the purpose of the TAG pin on the AD977CRZ?
The TAG pin on the AD977CRZ serves as a daisy-chain enabler in multi-ADC systems using external clock mode (EXT/INT = HIGH). When multiple AD977CRZ devices share a common DATA line, the TAG input level is echoed on DATA after 16–17 DATACLK periods, allowing the host to distinguish which device's data is being transmitted. This eliminates the need for separate DATA lines or multiplexers.
Can the AD977CRZ interface directly with a microcontroller SPI port?
The AD977CRZ does not implement standard SPI protocol (no dedicated SCLK, MOSI, MISO, or SS signals), but its serial interface is compatible with SPI-capable MCUs via GPIO-controlled bit-banging or custom peripheral configuration. DATA outputs MSB-first on each DATACLK edge (internal mode) or synchronous to external DATACLK (external mode), with BUSY indicating conversion status. Full timing compliance requires adherence to t10/t11 setup/hold specifications in Table 4.
AD977CRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 100k
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD977CRZ FAQ
1.How can I place an order for AD977CRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD977CRZ 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 AD977CRZ reliable?
The price and inventory of AD977CRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD977CRZ is usually 5 days.
3.What payment methods are accepted for AD977CRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD977CRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD977CRZ?
AD977CRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD977CRZ 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 AD977CRZ?
For technical support, including AD977CRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD977CRZ requirements.
6.How does Aetrix verify that AD977CRZ is sourced from the original manufacturer or authorized distributors?
All AD977CRZ 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 AD977CRZ meets industry standards.
7.What is the process for return or replacement of AD977CRZ?
All AD977CRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD977CRZ, 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 AD977CRZ part is unused and in its original packaging.
Return procedure for AD977CRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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