My Inquiry
My Account
Analog Devices Inc. AD820ANZ
- Part No.:
- AD820ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD820ANZ.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,133
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD820ANZ from Analog Devices is a precision, low-power, FET-input operational amplifier with true single-supply operation (5 V to 30 V), rail-to-rail output swing (within 10 mV of rails), and input voltage range extending 0.2 V below negative rail. It delivers 1.8 MHz unity-gain bandwidth, 3 V/μs slew rate, and 800 μA max quiescent current - enabling high-accuracy signal conditioning in battery-powered instrumentation and photodiode preamplifiers.
For engineers reviewing the AD820ANZ datasheet, AD820ANZ pinout, AD820ANZ application, or AD820ANZ equivalent, key selection considerations include its 25 pA max input bias current, 800 μV max input offset voltage, capacitive load drive capability up to 350 pF, and compatibility with 8-lead PDIP packaging for through-hole prototyping and industrial control interfaces.
Technical Context
The AD820ANZ employs an N-channel JFET input stage enabling ultra-low input bias current (<25 pA) and high input impedance (10¹³ Ω || 0.5 pF differential), critical for high-source-impedance sensor interfaces. Its bipolar rail-to-rail output stage achieves 5 mV sinking and 10 mV sourcing saturation voltage at light loads, supporting wide dynamic range in single-supply systems.
It operates across ±2.5 V to ±15 V dual supplies or 5 V to 30 V single supply, with common-mode input range spanning −0.2 V to (V+) − 1 V. The amplifier maintains phase stability driving ≥350 pF capacitive loads without external compensation and exhibits no phase reversal up to +VS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | Single: 5 V to 30 V; Dual: ±2.5 V to ±15 V - supports direct integration into 5 V microcontroller systems and 24 V industrial rails. |
| Unity-Gain Bandwidth | 1.8 MHz - enables stable gain-of-1 buffering and active filtering up to ~100 kHz with adequate phase margin. |
| Slew Rate | 3 V/μs - supports clean 12-bit–14-bit data acquisition at sampling rates ≤200 kSPS with minimal distortion. |
| Input Offset Voltage | ≤800 μV max - ensures <0.02% error in 4 V full-scale precision measurement paths without trimming. |
| Input Bias Current | ≤25 pA max at 25°C - preserves signal integrity in photodiode, pH probe, and piezoelectric sensor front-ends. |
| Output Drive | ≥15 mA min continuous - drives 600 Ω loads directly and sustains 350 pF capacitive loads without oscillation. |
| Quiescent Current | ≤800 μA - enables multi-channel, always-on sensing in portable medical devices with >1-year battery life. |
Pinout & Package
AD820ANZ is packaged in an 8-lead plastic DIP (PDIP_N) with through-hole mounting. Pin 1 is NC (no connect), Pin 2 is inverting input (−IN), Pin 3 is non-inverting input (+IN), Pin 4 is negative supply (−VS), Pin 5 is NC, Pin 6 is output (VOUT), Pin 7 is positive supply (+VS), and Pin 8 is NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, Pin 5, Pin 8 | No Connect (NC) | Unused internal terminals; must remain unconnected to avoid parasitic coupling or latch-up risk. |
| Pin 2 | Inverting Input (−IN) | High-impedance JFET node; connects to feedback network in inverting configurations or reference point in transimpedance amps. |
| Pin 3 | Non-Inverting Input (+IN) | High-impedance JFET node; accepts sensor signals directly (e.g., thermocouple, bridge output) with minimal loading. |
| Pin 4 | Negative Supply (−VS) | Reference return for dual supply; tied to ground in single-supply mode to enable true ground-referenced inputs. |
| Pin 6 | Output (VOUT) | Rail-to-rail CMOS/bipolar composite stage; sources/sinks ≥15 mA and swings within 10 mV of rails under light load. |
| Pin 7 | Positive Supply (+VS) | Main power rail; supports 5 V logic-compatible operation and 24 V industrial bus interfacing with appropriate decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| True single-supply operation | Input common-mode range extends 0.2 V below −VS and output swings to within 10 mV of both rails - eliminates level-shifting circuitry in 5 V systems. |
| FET input stage | 25 pA max input bias current and 10¹³ Ω input impedance - preserves accuracy in high-Z sensor interfaces (e.g., glass pH electrodes, photodiodes). |
| Rail-to-rail output | Delivers full supply dynamic range: e.g., 0.01 V to 4.99 V on 5 V rail - maximizes ADC utilization in 12-bit–14-bit data acquisition. |
| Capacitive load drive | Stable with up to 350 pF directly at output - enables direct connection to long PCB traces, LCD drivers, or ADC input filters without isolation resistors. |
| Low-noise performance | 13 nV/√Hz @ 10 kHz and 2 μV p-p @ 0.1 Hz–10 Hz - ensures sub-LSB noise floor in precision DC-coupled instrumentation amplifiers. |
Applications
| Battery-Powered Instrumentation | Photodiode Preamp |
|---|---|
|
Use Scenario: Portable multimeter front-end measuring mV-level thermocouple outputs with 12-bit SAR ADC. IC Role / Device Role / Timing Role: Precision DC-coupled buffer and gain stage with zero-drift offset correction path. Use Value: 800 μV max offset and 2 μV/°C drift ensure <±1 LSB error over 0°C–50°C without calibration; 800 μA quiescent current extends battery life. |
Use Scenario: Low-light optical sensor in smoke detector converting picoamp photocurrent to voltage. IC Role / Device Role / Timing Role: Transimpedance amplifier with high-Z virtual ground and low input current noise. Use Value: 25 pA max input bias current prevents signal corruption; 13 nV/√Hz noise enables detection of <100 nA photocurrents at 1 kHz bandwidth. |
| Active Filters | Medical Instrumentation |
|
Use Scenario: 3-pole Sallen-Key low-pass filter (100 Hz cutoff) in ECG analog front-end suppressing 50/60 Hz interference. IC Role / Device Role / Timing Role: Unity-gain stable op amp implementing second-order pole-zero placement with minimal component count. Use Value: 1.8 MHz GBW and 3 V/μs slew rate support clean 100 Hz filtering with <0.1 dB passband ripple; rail-to-rail output avoids clipping. |
Use Scenario: Patient-isolated biosignal amplifier in portable EEG device acquiring scalp potentials. IC Role / Device Role / Timing Role: First-stage differential amplifier with high CMRR and low input current for dry-electrode interface. Use Value: 80 dB min CMRR rejects common-mode noise from switching power supplies; 25 pA input bias prevents electrode polarization errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC27L2CP | Lower supply current (60 μA), but only 890 kHz GBW, 0.55 V/μs slew rate, and 1.5 mV max offset. | Acceptable for ultra-low-power DC sensors where speed <100 kHz and offset <1.5 mV are tolerable. | Choose TLC27L2CP only when quiescent current is primary constraint and AC performance is secondary. |
| OPA344PA | Higher speed (1 MHz GBW, 0.8 V/μs), lower noise (11 nV/√Hz), but 500 pA input bias current and no rail-to-rail output. | Suitable for higher-bandwidth analog front-ends where input Z >100 MΩ is not required and output swing >90% rail is acceptable. | Select OPA344PA when bandwidth >500 kHz is needed and FET input is not mandatory for source impedance. |
Compared with TLC27L2CP and OPA344PA, AD820ANZ uniquely balances rail-to-rail output, sub-1 mV offset, 25 pA input bias, and 1.8 MHz bandwidth in a PDIP package - making it optimal for precision, single-supply, medium-speed instrumentation where layout simplicity and DC accuracy are prioritized.
Availability
AD820ANZ is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodiode preamplifiers, and active filter designs requiring stable component supply across industrial temperature ranges (−40°C to +85°C).
Supply support for AD820ANZ 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 precision instrumentation, industrial automation, and medical electronics markets.
The AD820 series was designed as a general-purpose, low-power FET-input op amp family targeting single-supply precision signal conditioning - emphasizing rail-to-rail output, wide supply range, and robust capacitive load drive in legacy-compatible packages.
FAQ
What supply voltage range does the AD820ANZ support?
The AD820ANZ operates from a single supply of 5 V to 30 V or dual supplies of ±2.5 V to ±15 V. Its true single-supply capability allows the input common-mode voltage to extend 0.2 V below the negative rail, and the output swings within 10 mV of both supply rails - enabling full dynamic range utilization in 5 V microcontroller-based systems without level shifters. This range is confirmed in the Absolute Maximum Ratings and General Description sections of Rev. H datasheet.
Does the AD820ANZ have rail-to-rail input capability?
No, the AD820ANZ does not feature rail-to-rail input. Its input common-mode voltage range extends from 0.2 V below −VS to (V+) − 1 V - meaning it accepts signals down to ground (or slightly below) in single-supply mode but cannot reliably process inputs within 1 V of the positive rail without bandwidth degradation or increased common-mode error. This limitation is explicitly documented in the Input Characteristics section and Figure 20 of the Rev. H datasheet.
What is the maximum capacitive load the AD820ANZ can drive stably?
The AD820ANZ is specified to drive up to 350 pF of capacitive load without external compensation or instability, as stated in the Output Characteristics table (Page 4) and verified in Figure 16 (open-loop gain/phase margin vs. frequency with CL = 100 pF). This capability allows direct connection to ADC input capacitors, long PCB traces, or LCD segment drivers while maintaining phase margin >45° - a key differentiator versus many general-purpose op amps.
How does the AD820ANZ handle input voltages exceeding the positive supply rail?
The AD820ANZ does not exhibit phase reversal for input voltages up to and including +VS, as demonstrated in Figure 38a of the Rev. H datasheet. However, if the input exceeds +VS by more than 300 mV, internal junctions become forward-biased, reversing input current direction and risking damage if sustained >10 seconds. A series current-limiting resistor (e.g., 1 kΩ) is recommended for overvoltage protection - a design requirement clearly outlined in the Applications Information section.
Is the AD820ANZ suitable for photodiode transimpedance amplifier applications?
Yes, the AD820ANZ is well-suited for photodiode TIA applications due to its 25 pA max input bias current, 13 nV/√Hz input voltage noise at 10 kHz, and ability to maintain picoamp-level input currents even with input voltages 20 V below −VS. Its high input impedance (10¹³ Ω) minimizes signal loss, and rail-to-rail output accommodates wide photocurrent dynamic ranges - all confirmed in the Applications and Input Characteristics sections of Rev. H.
AD820ANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 3V/µs
- Gain Bandwidth Product:
- 1.8 MHz
- -3db Bandwidth:
- 1.9 MHz
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 400 µV
- Current - Supply:
- 700µA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
AD820ANZ FAQ
1.How can I place an order for AD820ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD820ANZ 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 AD820ANZ reliable?
The price and inventory of AD820ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD820ANZ is usually 5 days.
3.What payment methods are accepted for AD820ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD820ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD820ANZ?
AD820ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD820ANZ 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 AD820ANZ?
For technical support, including AD820ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD820ANZ requirements.
6.How does Aetrix verify that AD820ANZ is sourced from the original manufacturer or authorized distributors?
All AD820ANZ 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 AD820ANZ meets industry standards.
7.What is the process for return or replacement of AD820ANZ?
All AD820ANZ units undergo pre-shipment inspection (PSI). If there is an issue with AD820ANZ, 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 AD820ANZ part is unused and in its original packaging.
Return procedure for AD820ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD820ANZ Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
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…
