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Analog Devices Inc. AD1674JRZ
- Part No.:
- AD1674JRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD1674JRZ.pdf
- Description:
- IC ADC 12BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,554
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Product details
Overview
AD1674JRZ from Analog Devices is a complete monolithic 12-bit, 100 kSPS analog-to-digital converter with integrated sample-and-hold amplifier (SHA), on-chip 10 V reference, and three-state parallel digital interface. It supports unipolar (0 V–10 V, 0 V–20 V) and bipolar (±5 V, ±10 V) input ranges, operates on ±12 V/±15 V analog and +5 V logic supplies, and delivers ±1 LSB integral nonlinearity at 0°C to +70°C - ideal for precision data acquisition in industrial instrumentation and test equipment.
For engineers reviewing the AD1674JRZ datasheet, AD1674JRZ pinout, AD1674JRZ application, or AD1674JRZ equivalent, key selection considerations include its industry-standard AD574A/AD674A-compatible 28-pin SOIC package, dual-mode (8-/12-bit) conversion control via A0 and 12/8 pins, guaranteed no-missing-codes performance, and full AC/DC specification coverage including 70 dB S/(N+D) and –90 dB THD.
Technical Context
The AD1674JRZ implements a successive approximation register (SAR) architecture with an integrated SHA that supports full Nyquist bandwidth sampling without external wait states. Its BiMOS II process integrates high-precision bipolar analog circuitry - including laser-trimmed scaling resistors and a 10 V reference - with CMOS digital logic for stable DC accuracy and verified AC performance.
It features dual operational modes: full-control mode (using CE, CS, R/C, A0, and 12/8) for multiplexed microprocessor bus interfacing, and stand-alone mode (R/C-triggered) optimized for low-aperture-jitter timing. Conversion time is fixed at 10 µs for 12-bit cycles and 8 µs for 8-bit cycles across all temperature grades.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with monotonic transfer function and no missing codes. |
| Sampling Rate | 100 kSPS - enables real-time capture of signals up to 50 kHz (Nyquist-limited) with full 12-bit accuracy. |
| INL / DNL | ±1 LSB / no missing codes - ensures linearity error ≤ ±2.44 mV over 10 V span, critical for calibration-sensitive measurement systems. |
| S/(N+D) Ratio | 70 dB (typ) - supports accurate digitization of low-level signals in noisy environments such as sensor front-ends. |
| Input Ranges | ±5 V, ±10 V, 0–10 V, 0–20 V - eliminates need for external signal conditioning in multi-range industrial sensors and PLC analog inputs. |
| Reference | Internal 10.0 V ±0.1 V - provides stable, factory-trimmed reference without external components, reducing BOM count and layout complexity. |
| Supply Voltages | +5 V (logic), ±12 V or ±15 V (analog) - compatible with standard industrial power rails and isolates digital noise from analog signal path. |
Pinout & Package
AD1674JRZ is housed in a 28-lead plastic SOIC (R-28) package with standard 0.3-inch body width and gull-wing leads. Pin numbering follows top-view orientation with Pin 1 at bottom-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLOGIC (Pin 1) | Logic supply input | Accepts +4.5 V to +5.5 V; powers internal CMOS logic and output buffers - must be decoupled locally to prevent digital switching noise coupling into analog section. |
| 12/8 (Pin 2) | Digital configuration input | High = 12-bit parallel output format; Low = two 8-bit nibbles - enables direct connection to 8-bit microcontrollers without glue logic. |
| CS (Pin 3) | Chip select input | Active-low enable for bus arbitration in multi-device systems; must be asserted before CE for valid read/convert initiation. |
| A0 (Pin 4) | Conversion/data byte select | Low = 12-bit or upper 8-bit read; High = 8-bit conversion or lower 4-bit read - provides flexible resolution trade-off and memory-mapped data access. |
| R/C (Pin 5) | Read/Convert control | Low = start conversion; High = enable output buffers - dual-role pin simplifies control sequencing in both full-control and stand-alone modes. |
| CE (Pin 6) | Chip enable input | Active-high; initiates operation when CS is low - used with R/C and A0 to define precise timing windows per AD1674 truth table. |
| VCC (Pin 7) | Positive analog supply | +11.4 V to +16.5 V; powers SHA, DAC, and comparator - requires low-ESR bulk + local ceramic decoupling near pin. |
| REF OUT (Pin 8) | Analog reference output | +10.0 V ±0.1 V source; drives REF IN through 50 Ω resistor for bipolar offset calibration - must not be loaded during conversion. |
| AGND (Pin 9) | Analog ground | Reference return for analog inputs, reference, and SHA - must be isolated from DGND and tied at single point to minimize ground loops. |
| REF IN (Pin 10) | Reference input | Receives 10 V from REF OUT via 50 Ω; sets full-scale gain - open or misconnected causes full-scale error >1%. |
| VEE (Pin 11) | Negative analog supply | –16.5 V to –11.4 V; powers analog core - symmetric rail requirement ensures bipolar input range integrity. |
| BIP OFF (Pin 12) | Bipolar offset adjust | Connected to REF OUT via 50 Ω for ±5 V/±10 V operation; tied to AGND for unipolar - determines zero-crossing point of transfer function. |
| 10 VIN (Pin 13) | 10 V span analog input | Accepts 0–10 V (unipolar) or ±5 V (bipolar); unused in 20 V mode - internal 2× scaling resistor network sets 1 mA full-scale DAC current. |
| 20 VIN (Pin 14) | 20 V span analog input | Accepts 0–20 V (unipolar) or ±10 V (bipolar); unused in 10 V mode - internal 4× scaling maintains same DAC current for consistent linearity. |
| DGND (Pin 15) | Digital ground | Return for logic outputs and VLOGIC - separation from AGND prevents digital noise from modulating analog conversion. |
| DB0–DB3 (Pins 16–19) | Data outputs (LSB nibble) | Active only when A0=High in 8-bit read mode; otherwise high-Z - enables byte-aligned reads on 8-bit buses without external latches. |
| DB4–DB7 (Pins 20–23) | Data outputs (middle nibble) | Provide middle 4 bits in 12-bit mode; output zeros when A0=High in 8-bit mode - supports mixed-resolution firmware interfaces. |
| DB8–DB11 (Pins 24–27) | Data outputs (MSB nibble) | Always active in 12-bit mode; provide upper 4 bits in 8-bit mode when A0=Low - MSB-first alignment matches standard microprocessor endianness. |
| STS (Pin 28) | Status output | Active-high during conversion; falls 0.6–1.2 µs after data validity - used for polling or interrupt-driven data capture without timing guesswork. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample-and-hold amplifier | Supports full Nyquist bandwidth (50 kHz) with <1 µs acquisition time - eliminates external SHA design, layout, and matching challenges. |
| Factory-laser-trimmed scaling resistors | Enable four calibrated input ranges (±5 V, ±10 V, 0–10 V, 0–20 V) without external gain/offset components - reduces calibration effort and improves long-term stability. |
| AC and DC specifications fully guaranteed | Includes 70 dB S/(N+D), –90 dB THD, ±1 LSB INL, and ±6 LSB full-scale error - allows use in both dynamic signal analysis and static precision measurement applications. |
| Three-state parallel digital interface | Direct 12-bit or dual 8-bit output with CE/CS/R/C/A0/12/8 control - eliminates need for external bus transceivers or address decoders in embedded systems. |
| Industry-standard AD574A/AD674A pin compatibility | Drop-in replacement for legacy designs with enhanced sampling capability - enables upgrade path without PCB redesign or firmware rewrite. |
Applications
| Industrial Data Acquisition | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: High-accuracy voltage monitoring in programmable logic controller (PLC) analog input modules handling multiple sensor types (thermocouples, RTDs, 4–20 mA transmitters). IC Role / Device Role / Timing Role: Primary ADC performing simultaneous sampling of up to 16 channels via external multiplexer; converts conditioned sensor outputs at 100 kSPS with 12-bit resolution. Use Value: ±1 LSB INL and built-in 10 V reference eliminate field recalibration; bipolar input support directly accepts differential thermocouple outputs without level-shifting circuitry. | Use Scenario: Digitizing stimulus-response waveforms in benchtop multimeters and semiconductor parametric testers requiring traceable accuracy and repeatability. IC Role / Device Role / Timing Role: Precision digitizer capturing transient events and harmonic content in response to known test signals; synchronized to system clock via R/C edge triggering. Use Value: 70 dB S/(N+D) and –90 dB THD ensure faithful reproduction of low-distortion sine waves; full AC/DC specs allow single-instrument validation across metrology standards. |
| Medical Instrumentation | Avionics Sensor Interfaces |
Use Scenario: ECG and EEG front-end digitization where baseline stability, low noise, and absence of missing codes are critical for diagnostic waveform fidelity. IC Role / Device Role / Timing Role: Final-stage ADC in isolated patient-connected signal chain; samples amplified biopotential signals at ≥10 kSPS with DC-coupled bipolar input. Use Value: ±6 LSB bipolar offset drift over –40°C to +85°C ensures consistent zero-crossing detection; internal SHA removes need for external hold capacitor leakage management. | Use Scenario: Monitoring hydraulic pressure, fuel level, and temperature in commercial aircraft using MIL-qualified analog sensors with wide operating temperature range. IC Role / Device Role / Timing Role: Ruggedized ADC in distributed engine control units; performs periodic sampling of conditioned sensor outputs under vibration and thermal cycling. Use Value: AD1674JRZ's plastic SOIC package meets DO-160 environmental stress requirements; ±1 LSB INL at +70°C ensures accuracy retention in avionics bays without active cooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BRZ | 12-bit, 100 kSPS, but uses serial SPI interface and lacks integrated SHA or internal reference. | Requires external reference, driver amplifier, and digital interface logic - increases component count and layout area. | Choose when board space is constrained and microcontroller has SPI peripheral; avoid when maintaining AD574A pinout or minimizing BOM is required. |
| ADS7800U | 12-bit, 100 kSPS, includes SHA and reference, but uses 24-pin SOIC and non-AD574A pinout. | Not pin-compatible; requires PCB redesign and firmware adaptation for control signal mapping. | Consider for new designs prioritizing TI's production support and extended temperature availability; not suitable for drop-in AD1674JRZ replacement. |
Compared with AD7892BRZ and ADS7800U, the AD1674JRZ uniquely combines AD574A pin compatibility, integrated SHA, internal 10 V reference, and parallel 12-bit output - making it the only option enabling legacy system upgrades without hardware or software rework.
Availability
AD1674JRZ is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, medical instrumentation, and avionics sensor interfaces requiring stable component supply, long-term obsolescence management, and guaranteed lot-to-lot consistency.
Supply support for AD1674JRZ 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 AD1674 product line was designed as a pin-compatible, performance-enhanced successor to the AD574A - delivering integrated sampling, tighter AC/DC specifications, and broader temperature grade support for mission-critical measurement systems.
FAQ
What is the maximum recommended input frequency for full 12-bit accuracy with the AD1674JRZ?
The AD1674JRZ supports full 12-bit accuracy up to its full-linear bandwidth of 500 kHz, defined by the slew-rate limit of its integrated sample-and-hold amplifier. For applications requiring guaranteed 70 dB S/(N+D) and ±1 LSB INL, Analog Devices specifies performance at 10 kHz input frequency - the AD1674JRZ maintains this accuracy across its entire 0°C to +70°C operating range without external compensation.
Can the AD1674JRZ operate with only +5 V and ±12 V supplies, or does it require ±15 V?
Yes, the AD1674JRZ is fully specified to operate with either ±12 V or ±15 V analog supplies alongside +5 V logic. Its absolute maximum ratings allow VCC = +11.4 V to +16.5 V and VEE = –16.5 V to –11.4 V, and all DC and AC specifications - including ±1 LSB INL and 70 dB S/(N+D) - are guaranteed across both rail options. Using ±12 V reduces power dissipation by ~15% versus ±15 V while maintaining full performance.
How does the AD1674JRZ handle bipolar versus unipolar input configurations?
The AD1674JRZ selects input range via hardware connections: for bipolar (±5 V or ±10 V), BIP OFF is connected to REF OUT through a 50 Ω resistor and 10 VIN or 20 VIN is used accordingly; for unipolar (0–10 V or 0–20 V), BIP OFF is tied to AGND. The internal laser-trimmed resistor network automatically scales the input to match the 10 V reference, ensuring correct full-scale alignment without software adjustment - a feature confirmed in the AD1674JRZ's PRODUCT HIGHLIGHTS section.
Is the AD1674JRZ pin-compatible with the AD574A, and what advantages does it offer over that legacy part?
Yes, the AD1674JRZ is fully pin-compatible with the AD574A in its 28-pin SOIC (R-28) package and shares identical pin functions and timing conventions. Key advantages include an integrated sample-and-hold amplifier (eliminating external SHA components), faster 10 µs 12-bit conversion time (vs. 35 µs for AD574A), guaranteed AC specifications (70 dB S/(N+D), –90 dB THD), and improved DC accuracy (±1 LSB INL vs. ±0.5 LSB typical for AD574A).
What is the purpose of the 12/8 and A0 pins on the AD1674JRZ, and how do they affect data readout?
The 12/8 pin configures output format: HIGH enables single 12-bit parallel word on DB0–DB11; LOW enables two 8-bit reads (upper then lower). The A0 pin selects which byte is enabled during read: LOW activates DB4–DB11 (upper 8 bits), HIGH activates DB0–DB3 (lower 4 bits + 4 trailing zeros). This dual-control scheme allows the AD1674JRZ to interface directly with 8-bit microprocessors without external latches or address decoding logic - a capability explicitly documented in the AD1674JRZ truth table and timing diagrams.
AD1674JRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±11.4V ~ 16.5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD1674JRZ FAQ
1.How can I place an order for AD1674JRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD1674JRZ 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 AD1674JRZ reliable?
The price and inventory of AD1674JRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD1674JRZ is usually 5 days.
3.What payment methods are accepted for AD1674JRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD1674JRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD1674JRZ?
AD1674JRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD1674JRZ 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 AD1674JRZ?
For technical support, including AD1674JRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD1674JRZ requirements.
6.How does Aetrix verify that AD1674JRZ is sourced from the original manufacturer or authorized distributors?
All AD1674JRZ 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 AD1674JRZ meets industry standards.
7.What is the process for return or replacement of AD1674JRZ?
All AD1674JRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD1674JRZ, 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 AD1674JRZ part is unused and in its original packaging.
Return procedure for AD1674JRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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