My Inquiry
My Account
Analog Devices Inc. AD7898ARZ-3
- Part No.:
- AD7898ARZ-3
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7898ARZ-3.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,034
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7898ARZ-3 from Analog Devices is a 12-bit successive approximation ADC with 220 kSPS throughput, ±2.5 V bipolar input range, single 5 V supply operation, and integrated track/hold amplifier - used in precision data acquisition systems for industrial sensor interfacing and portable instrumentation.
For engineers reviewing the AD7898ARZ-3 datasheet, AD7898ARZ-3 pinout, AD7898ARZ-3 application, or AD7898ARZ-3 equivalent, this page delivers verified technical context, real-world timing constraints (e.g., 4.33 µs max conversion time in Mode 1), power-down capability for battery-powered designs, and validated alternative options for ±2.5 V input-range ADC replacement.
Technical Context
The AD7898ARZ-3 implements a laser-trimmed internal oscillator for Mode 0 operation and accepts external SCLK up to 3.7 MHz in Mode 1, where it supports power-down mode with 20 µA max IDD over temperature. Its analog front-end uses a resistive ladder (R1 = R2 = 6.5 kΩ, R3 open) followed by a high-impedance track/hold stage, enabling 5 kΩ min input resistance and 4.7 MHz full-power bandwidth at 1 dB.
It features two-wire serial interface control via CS/CONVST (dual-function pin), outputs 16-bit twos-complement words (4 leading zeros + 12-bit result), and maintains 71 dB SNR at 30 kHz input while operating across –40°C to +85°C with 22.5 mW max power dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees no missing codes; LSB = 1.22 mV for ±2.5 V range |
| Throughput Rate | 220 kSPS max - achievable in both Mode 0 (internal clock) and Mode 1 (external SCLK) |
| Analog Input Range | ±2.5 V - optimized for low-voltage sensor signals without external scaling |
| Power Dissipation | 22.5 mW max - enables use in thermally constrained or battery-powered systems |
| Full-Power Bandwidth | 4.7 MHz @ 1 dB - supports subsampling of IF signals up to ~4.5 MHz |
| SNR | 71 dB min at 30 kHz - ensures >11.5 ENOB for precision measurement applications |
| Reference Input | 2.5 V ± 5% - requires external buffered reference (e.g., AD780); on-chip buffering reduces loading |
Pinout & Package
AD7898ARZ-3 is housed in an 8-lead SOIC (R-8) package with gull-wing leads, RoHS-compliant (Pb-free), and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF IN | Voltage reference input | Accepts 2.375 V–2.625 V buffered reference; 0.1 µF decoupling required |
| 2 - VIN | Analog input channel | ±2.5 V bipolar range; 5 kΩ min input resistance; no dynamic charging current |
| 3 - GND | Analog ground reference | Common return for track/hold, comparator, DAC, and digital circuitry |
| 4 - SCLK | Serial clock input | Drives data output in both modes; serves as conversion clock in Mode 1 |
| 5 - SDATA | Serial data output | 16-bit twos-complement word (MSB first); three-stated after transfer |
| 6 - VDRIVE | Logic power supply | Sets I/O voltage level (2.7–5.25 V); enables direct interface to 3 V processors |
| 7 - CS / CONVST | Chip select / convert start | Falling-edge triggered: initiates conversion and frames serial data |
| 8 - VDD | Analog power supply | 4.75–5.25 V; powers core ADC, track/hold, and internal logic |
Key Features
| Feature | Design Value |
|---|---|
| Flexible dual-mode serial interface | Mode 0 (3-wire, internal clock) and Mode 1 (3-wire, external SCLK + power-down) - eliminates need for separate timing controller |
| VDRIVE logic-level independence | Separate 2.7–5.25 V supply for digital I/O allows seamless interfacing with 3 V microcontrollers without level shifters |
| On-chip track/hold amplifier | Acquires signal within 450 ns typical (AD7898ARZ-3); supports high-frequency inputs up to 4.7 MHz |
| Low-power operation | 22.5 mW max active power; 25 µW max in power-down mode - extends battery life in portable instruments |
| Bipolar ±2.5 V input range | Direct compatibility with industrial transducer outputs (e.g., 4–20 mA loop receivers, strain gauge bridges) |
Applications
| Industrial Process Monitoring | Portable Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of 4–20 mA current-loop sensor outputs in factory-floor PLC modules. IC Role / Device Role / Timing Role: ADC digitizes conditioned analog signals with ±2.5 V range matching typical I/V converter outputs; 220 kSPS supports oversampling for noise reduction. Use Value: Eliminates external signal conditioning; 12-bit resolution captures sub-mA changes; low 22.5 mW power avoids thermal drift in enclosed enclosures. |
Use Scenario: Battery-powered environmental sensor node measuring temperature, humidity, and pressure over extended field deployments. IC Role / Device Role / Timing Role: ADC performs high-fidelity sampling during brief wake-up cycles; Mode 1 power-down reduces quiescent current to 20 µA. Use Value: Enables >1-year battery life using CR2032; VDRIVE pin simplifies connection to 3.3 V MCU; integrated track/hold removes need for external sample-hold IC. |
| Test & Measurement Equipment | Medical Instrumentation |
Use Scenario: Digitizing analog waveforms in handheld oscilloscopes and signal analyzers with limited PCB area. IC Role / Device Role / Timing Role: ADC provides 12-bit accuracy and 4.7 MHz full-power bandwidth for baseband signal capture; 8-lead SOIC saves board space vs. multi-chip solutions. Use Value: Achieves >11.5 ENOB at 30 kHz; compact footprint allows integration into palm-sized devices; SNR stability across temperature ensures calibration longevity. |
Use Scenario: ECG front-end signal chain capturing low-amplitude biopotential signals with minimal added noise. IC Role / Device Role / Timing Role: ADC digitizes amplified, filtered biosignals; ±2.5 V range matches typical PGA output swing; 71 dB SNR preserves diagnostic fidelity. Use Value: On-chip track/hold rejects switching noise from digital sections; low THD (–78 dB) prevents harmonic distortion of cardiac waveforms; RoHS-compliant packaging meets medical regulatory requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, ±2.5 V input-range ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7476ARTZ-REEL7 | 12-bit SAR ADC, 1 MSPS, single 2.35–5.25 V supply, no on-chip track/hold, ±VREF input range only | Requires external track/hold and reference buffer for ±2.5 V bipolar operation; higher speed but less integrated | Select when system demands >220 kSPS and can accommodate external signal conditioning components |
| ADS7822U | 12-bit SAR ADC, 200 kSPS, 3 V supply only, SPI-compatible, no VDRIVE pin, ±VREF input | Not compatible with 5 V VDD systems; lacks VDRIVE flexibility; requires external ±2.5 V reference generation | Choose for cost-sensitive 3 V-only designs where 5 V tolerance and logic-level independence are unnecessary |
Compared with AD7898ARZ-3, AD7476ARTZ-REEL7 offers higher throughput but requires external support circuitry for bipolar acquisition, while ADS7822U simplifies BOM count in 3 V systems but sacrifices supply flexibility and integrated track/hold performance.
Availability
AD7898ARZ-3 is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, test equipment, and medical instrumentation requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for AD7898ARZ-3 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 Norwood, MA, with design centers worldwide.
The AD7898 product line delivers highly integrated, low-power, serial-output ADCs for space-constrained and battery-operated applications demanding precision, simplicity, and robustness in harsh environments.
FAQ
What is the maximum input frequency the AD7898ARZ-3 can accurately digitize?
The AD7898ARZ-3 achieves 4.7 MHz full-power bandwidth at the 1 dB point, meaning it maintains specified dynamic performance (e.g., 71 dB SNR) for sinusoidal inputs up to ~4.7 MHz when sampled at 220 kSPS. This makes it suitable for subsampling intermediate-frequency signals in communications and instrumentation applications, provided proper anti-aliasing filtering is applied.
Does the AD7898ARZ-3 require an external reference voltage?
Yes, the AD7898ARZ-3 requires an external 2.5 V ± 5% reference connected to the REF IN pin. The device includes on-chip buffering to reduce loading effects, and a 0.1 µF capacitor must be placed directly at the REF IN pin for stability. Common choices include the AD780 or ADR421 precision references.
How does the VDRIVE pin affect interface compatibility with microcontrollers?
The VDRIVE pin sets the logic voltage level for SDATA, SCLK, and CS/CONVST pins independently of VDD. When VDRIVE = 3.3 V, the AD7898ARZ-3 drives and accepts 3.3 V logic levels - enabling direct connection to 3.3 V MCUs without level shifters. This decoupling allows mixed-supply systems (e.g., 5 V analog section, 3.3 V digital host) to operate reliably.
What is the difference between Mode 0 and Mode 1 operation in the AD7898ARZ-3?
In Mode 0, conversion is initiated by a falling edge on CS/CONVST and controlled by an internal oscillator; data is read after conversion completes. In Mode 1, the external SCLK drives both conversion timing and serial data transfer, and supports power-down mode (20 µA max IDD). Mode 1 is preferred for ultra-low-power portable applications, while Mode 0 simplifies timing in fixed-rate systems.
Can the AD7898ARZ-3 interface directly with a 3.3 V FPGA without level-shifting circuitry?
Yes - by connecting the FPGA's 3.3 V supply to the VDRIVE pin, the AD7898ARZ-3 configures its SDATA, SCLK, and CS/CONVST pins for 3.3 V logic levels. Input thresholds (VINH = 0.7 × VDRIVE, VINL = 0.3 × VDRIVE) and output drive strength (VOH = VDRIVE – 0.4 V, VOL = 0.4 V) ensure reliable interoperability with standard 3.3 V FPGA I/O banks.
AD7898ARZ-3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 220k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7898ARZ-3 FAQ
1.How can I place an order for AD7898ARZ-3 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7898ARZ-3 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 AD7898ARZ-3 reliable?
The price and inventory of AD7898ARZ-3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7898ARZ-3 is usually 5 days.
3.What payment methods are accepted for AD7898ARZ-3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7898ARZ-3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7898ARZ-3?
AD7898ARZ-3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7898ARZ-3 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 AD7898ARZ-3?
For technical support, including AD7898ARZ-3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7898ARZ-3 requirements.
6.How does Aetrix verify that AD7898ARZ-3 is sourced from the original manufacturer or authorized distributors?
All AD7898ARZ-3 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 AD7898ARZ-3 meets industry standards.
7.What is the process for return or replacement of AD7898ARZ-3?
All AD7898ARZ-3 units undergo pre-shipment inspection (PSI). If there is an issue with AD7898ARZ-3, 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 AD7898ARZ-3 part is unused and in its original packaging.
Return procedure for AD7898ARZ-3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7898ARZ-3 Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
