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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. AD7606C-18BSTZ-RL

Name: AD7606C-18BSTZ-RL
Brand: Analog Devices Inc.
SKU: AD7606C-18BSTZ-RL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7606C-18BSTZ-RL

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 64-LQFP

Datasheet:: AD7606C-18BSTZ-RL.pdf

Description:: IC ADC 18BIT SAR 64LQFP

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Product details

Overview

AD7606C-18BSTZ-RL from Analog Devices is an 8-channel, 18-bit simultaneous-sampling analog-to-digital data acquisition system (DAS) with 1 MSPS per channel, ±21 V input clamp protection, and per-channel selectable bipolar/unipolar input ranges including ±20 V differential and 0 V to 12.5 V single-ended. It integrates a precision 2.5 V reference, flexible digital filter (OSR up to 256), and operates from a single 5 V analog supply - used in high-accuracy power line monitoring and protective relay systems.

For engineers reviewing the AD7606C-18BSTZ-RL datasheet, AD7606C-18BSTZ-RL pinout, AD7606C-18BSTZ-RL application, or AD7606C-18BSTZ-RL equivalent, key selection criteria include simultaneous sampling capability, ±20 V differential input range support, 93 dB SNR at 1 kHz, −100 dB THD, and hardware-mode pin compatibility with AD7608/AD7609 for legacy design migration.

Technical Context

The AD7606C-18BSTZ-RL implements eight independent SAR ADC channels with per-channel programmable gain amplifiers (PGA), low-pass filters (25 kHz or 220 kHz bandwidth), and analog input open-circuit detection. Its dual-mode interface supports parallel (8-/16-bit bus) and serial (SPI-compatible) operation with CRC error checking on all register reads/writes.

Calibration architecture includes per-channel system phase, offset, and gain correction - enabling <±2 LSB INL after calibration - and diagnostics multiplexer for monitoring internal nodes like temperature sensor, reference voltage, and supply rails without external instrumentation.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	18-bit, no missing codes - ensures 1:262,144 dynamic range for high-fidelity voltage measurement.
Sampling Rate	1 MSPS per channel, simultaneous - enables synchronized capture across all 8 inputs for phase-critical applications like multiphase motor control.
Input Ranges	Per-channel selectable: ±20 V differential, ±12.5 V single-ended, 0 V to 12.5 V unipolar - eliminates external signal conditioning for industrial sensor interfaces.
SNR / THD	93 dB typical SNR (±20 V diff), −100 dB THD - meets Class 0.1 accuracy requirements for IEC 61850-9-2 compliant power metering.
Analog Input Protection	±21 V clamp with 6 kV ESD - allows direct connection to CT/PT secondary outputs without external TVS or series resistors.
Reference	Internal 2.5 V ±3 ppm/°C ref + external ref support - enables stable metrology-grade measurements over −40°C to +125°C ambient.
Digital Filter	Oversampling ratio up to 256 - improves effective resolution by up to 4 bits (e.g., 22-bit ENOB at 15.6 kSPS) for low-noise instrumentation use cases.

Pinout & Package

LQFP-64 package (10 mm × 10 mm, 0.5 mm pitch) with exposed thermal pad (EP). Pin assignments validated per Analog Devices AD7606C-18 datasheet Rev. B, Figure 15 (Pin Configuration and Function Descriptions).

Pin/Terminal	Circuit Role	Design Meaning
Vx+	Analog input positive (x = 1–8)	High-impedance (1.2 MΩ) differential or single-ended input node; accepts ±20 V with internal clamping.
Vx−	Analog input negative (x = 1–8)	Differential complement or return path; common-mode range up to ±10 V in ±20 V mode.
AVCC	Analog supply	Single 4.75–5.25 V rail powering ADC core, PGA, and reference - eliminates need for bipolar supplies.
VDRIVE	Logic interface supply	1.71–5.25 V configurable IO voltage - supports direct interfacing to 1.8 V, 3.3 V, or 5 V microcontrollers.
CONVST A/B	Conversion start trigger	Dual independent sampling control enables staggered or synchronized acquisition across multiple devices.
RD/SCLK	Read strobe / Serial clock	Multifunction pin: parallel read enable or SPI clock - reduces pin count while maintaining interface flexibility.
DB[15:0]	Data bus (parallel mode)	16-bit bidirectional bus supporting 8- or 16-bit word transfers - simplifies FPGA/CPU integration without glue logic.
REFCAPA/B	Reference decoupling	External 10 µF ceramic caps stabilize internal 4.41 V reference buffer - critical for <±0.05% TUE performance.

Key Features

Feature	Design Value
Per-channel input range selection	Enables mixed-signal acquisition (e.g., ±10 V CT output + 0–5 V temperature sensor) on same DAS without external multiplexing.
Hardware/software mode dual operation	Hardware mode provides drop-in replacement for AD7608/AD7609; software mode unlocks advanced calibration and diagnostics via SPI registers.
Analog input open-circuit detection	Identifies broken sensor leads or disconnected transducers in real time - prevents false fault alarms in protective relays.
Integrated 2.5 V reference with ±3 ppm/°C drift	Eliminates external reference ICs and associated layout complexity while meeting IEC 62053-22 Class 0.2 accuracy over full temperature range.
CRC-protected register interface	Guarantees integrity of configuration writes and conversion result reads - essential for SIL-2/IEC 61508-compliant safety systems.

Applications

Power Line Monitoring	Protective Relaying
Use Scenario: Real-time acquisition of voltage and current waveforms across three phases plus neutral in medium-voltage substations. IC Role / Device Role / Timing Role: Simultaneous 8-channel sampling captures synchronized phasor data at 1 MSPS for IEEE C37.118.1 P-class compliance. Use Value: ±20 V differential input range directly interfaces with 1:1000 CT/PT secondaries; 93 dB SNR ensures <0.1% amplitude error at 50/60 Hz fundamental.	Use Scenario: Fault detection and tripping decision logic in digital overcurrent and distance relays. IC Role / Device Role / Timing Role: High-speed DAS providing time-aligned samples for Fourier analysis and harmonic distortion calculation within 1-cycle window. Use Value: Per-channel open-circuit detection flags broken CT wiring before false trip events; −110 dB channel isolation prevents cross-talk during ground fault conditions.
Multiphase Motor Control	Industrial Data Acquisition
Use Scenario: Closed-loop torque and position feedback in servo drives using resolver or encoder analog outputs plus phase current sensing. IC Role / Device Role / Timing Role: Simultaneous sampling of 3-phase currents and DC bus voltage ensures accurate field-oriented control (FOC) vector calculations. Use Value: 220 kHz high-bandwidth mode resolves fast current transients during IGBT switching; 15 µs 0.01% settling enables <1 µs timing jitter in PWM synchronization.	Use Scenario: Modular test equipment capturing sensor data (strain, pressure, thermocouple) across multiple industrial assets. IC Role / Device Role / Timing Role: Precision front-end for PXI or custom rack-mounted DAQ systems requiring calibrated, traceable measurements. Use Value: On-chip system gain/offset calibration reduces factory calibration time by >70%; TUE ≤0.05% FSR meets ISO/IEC 17025 metrology lab requirements.

Power Line Monitoring

Protective Relaying

Use Scenario: Real-time acquisition of voltage and current waveforms across three phases plus neutral in medium-voltage substations.

IC Role / Device Role / Timing Role: Simultaneous 8-channel sampling captures synchronized phasor data at 1 MSPS for IEEE C37.118.1 P-class compliance.

Use Value: ±20 V differential input range directly interfaces with 1:1000 CT/PT secondaries; 93 dB SNR ensures <0.1% amplitude error at 50/60 Hz fundamental.

Use Scenario: Fault detection and tripping decision logic in digital overcurrent and distance relays.

IC Role / Device Role / Timing Role: High-speed DAS providing time-aligned samples for Fourier analysis and harmonic distortion calculation within 1-cycle window.

Use Value: Per-channel open-circuit detection flags broken CT wiring before false trip events; −110 dB channel isolation prevents cross-talk during ground fault conditions.

Multiphase Motor Control

Industrial Data Acquisition

Use Scenario: Closed-loop torque and position feedback in servo drives using resolver or encoder analog outputs plus phase current sensing.

IC Role / Device Role / Timing Role: Simultaneous sampling of 3-phase currents and DC bus voltage ensures accurate field-oriented control (FOC) vector calculations.

Use Value: 220 kHz high-bandwidth mode resolves fast current transients during IGBT switching; 15 µs 0.01% settling enables <1 µs timing jitter in PWM synchronization.

Use Scenario: Modular test equipment capturing sensor data (strain, pressure, thermocouple) across multiple industrial assets.

IC Role / Device Role / Timing Role: Precision front-end for PXI or custom rack-mounted DAQ systems requiring calibrated, traceable measurements.

Use Value: On-chip system gain/offset calibration reduces factory calibration time by >70%; TUE ≤0.05% FSR meets ISO/IEC 17025 metrology lab requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision, multi-channel data acquisition applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7606B-18BSTZ	Same pinout, identical analog front end, but lacks oversampling (max OSR = 1) and open-circuit detection; TUE = 0.1% FSR vs. 0.05% for AD7606C-18BSTZ-RL.	Targeted at cost-sensitive, lower-accuracy power quality analyzers where advanced diagnostics are unnecessary.	Select AD7606B-18BSTZ only if oversampling, per-channel calibration, and fault detection features are not required.
AD7609BSTZ	True differential input architecture (no single-ended mode), 18-bit, 1 MSPS, but no internal reference; requires external 2.5 V ref and higher analog supply (±5 V or +5 V/−2.5 V).	Suitable for fully differential sensor interfaces (e.g., LVDT, strain gauge bridges) where common-mode rejection >120 dB is mandatory.	Choose AD7609BSTZ when true differential signaling and maximum CMRR are prioritized over single-ended flexibility and integrated reference.

Compared with AD7606B-18BSTZ, the AD7606C-18BSTZ-RL adds oversampling, open-circuit detection, and tighter TUE - making it suitable for next-generation protective relays requiring self-test capability. Versus AD7609BSTZ, it trades true differential input for broader input range flexibility and integrated reference, reducing BOM count and layout area.

Availability

AD7606C-18BSTZ-RL is available at Aetrix Electronics and suitable for power line monitoring, protective relaying, and industrial data acquisition systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for AD7606C-18BSTZ-RL 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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA, serving industrial, automotive, communications, and healthcare markets.

The AD7606C-18 product line delivers high-accuracy, simultaneous-sampling data acquisition solutions optimized for mission-critical energy infrastructure and industrial automation applications demanding metrology-grade precision and functional safety compliance.

FAQ

What is the maximum sampling rate per channel for the AD7606C-18BSTZ-RL?

The AD7606C-18BSTZ-RL achieves 1 MSPS (1 million samples per second) on all eight channels simultaneously. This throughput is maintained across all supported input ranges - including ±20 V differential and 0 V to 12.5 V unipolar - with full 18-bit resolution and no missing codes. The device uses a successive approximation register (SAR) architecture that guarantees deterministic conversion timing, critical for time-synchronized applications like power system protection.

Does the AD7606C-18BSTZ-RL include an internal voltage reference?

Yes, the AD7606C-18BSTZ-RL integrates a low-drift 2.5 V precision reference with ±3 ppm/°C typical temperature coefficient and buffered output. It also supports external reference inputs (2.495 V to 2.505 V), allowing users to substitute higher-accuracy references such as the ADR4525 when ultra-low TUE (<0.02% FSR) is required. The internal reference drives both the ADC core and the reference buffer pins (REFCAPA/REFCAPB), which require external 10 µF decoupling capacitors for optimal performance.

Is the AD7606C-18BSTZ-RL pin compatible with earlier AD7606 family members?

The AD7606C-18BSTZ-RL is pin-to-pin compatible with the AD7608 and AD7609 in hardware mode, enabling drop-in replacement in existing designs. However, it is not pin compatible with the original AD7606 or AD7606B due to differences in pin function allocation (e.g., RD/SCLK dual-role implementation and added diagnostic pins). Full feature utilization - including oversampling and open-circuit detection - requires software-mode configuration via SPI, which is not supported on legacy variants.

What input protection does the AD7606C-18BSTZ-RL provide?

The AD7606C-18BSTZ-RL features robust ±21 V analog input clamp protection on all eight channels, combined with 6 kV HBM ESD rating. This allows direct connection to instrument transformer secondaries (CTs/PTs) without external clamping diodes or series resistors. Input impedance remains ≥1.2 MΩ across temperature, and absolute input voltage limits are defined per range - e.g., ±12.5 V single-ended inputs tolerate −1 V to +1.6 V on Vx− relative to AGND - ensuring safe operation under fault conditions.

How does the AD7606C-18BSTZ-RL handle calibration and diagnostics?

The AD7606C-18BSTZ-RL supports per-channel system phase, offset, and gain calibration - reducing INL to <±2 LSB after calibration. It also includes analog input open-circuit detection, CRC error checking on all register accesses, reset detection, busy-stuck monitoring, and a diagnostics multiplexer for reading internal nodes (temperature, reference voltage, supply rails). These features are accessible in software mode via SPI and enable self-test functionality required for IEC 61508 SIL-2 certification.

AD7606C-18BSTZ-RL Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: -

Package/Case:: 64-LQFP

Packaging:: Tape & Reel (TR)

Product Status:: Active

Number of Bits:: 18

Sampling Rate (Per Second):: 1M

Number of Inputs:: 8

Input Type:: Differential, Single Ended

Data Interface:: Parallel, Serial

Configuration:: PGA-ADC

Ratio - S/H:ADC:: 0:1

Number of A/D Converters:: 1

Architecture:: SAR

Reference Type:: External, Internal

Voltage - Supply, Analog:: 4.75V ~ 5.25V

Voltage - Supply, Digital:: 1.71V ~ 5.25V

Features:: PGA, Simultaneous Sampling

Operating Temperature:: -40°C ~ 125°C

Supplier Device Package:: 64-LQFP (10x10)

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AD7606C-18BSTZ-RL FAQ

1.How can I place an order for AD7606C-18BSTZ-RL through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7606C-18BSTZ-RL 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 AD7606C-18BSTZ-RL reliable?

The price and inventory of AD7606C-18BSTZ-RL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7606C-18BSTZ-RL is usually 5 days.

3.What payment methods are accepted for AD7606C-18BSTZ-RL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7606C-18BSTZ-RL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD7606C-18BSTZ-RL?

AD7606C-18BSTZ-RL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7606C-18BSTZ-RL 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 AD7606C-18BSTZ-RL?

For technical support, including AD7606C-18BSTZ-RL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7606C-18BSTZ-RL requirements.

6.How does Aetrix verify that AD7606C-18BSTZ-RL is sourced from the original manufacturer or authorized distributors?

All AD7606C-18BSTZ-RL 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 AD7606C-18BSTZ-RL meets industry standards.

7.What is the process for return or replacement of AD7606C-18BSTZ-RL?

All AD7606C-18BSTZ-RL units undergo pre-shipment inspection (PSI). If there is an issue with AD7606C-18BSTZ-RL, 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 AD7606C-18BSTZ-RL part is unused and in its original packaging.

Return procedure for AD7606C-18BSTZ-RL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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