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Analog Devices Inc. AD8669ARUZ
- Part No.:
- AD8669ARUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD8669ARUZ.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:104
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Product details
Overview
AD8669ARUZ from Analog Devices is a quad, rail-to-rail output, precision CMOS operational amplifier optimized for low-noise, low-input-bias-current sensor signal conditioning. It delivers 175 µV max offset voltage, 23 nV/√Hz voltage noise, and 300 fA input bias current at 5 V supply, operating from 5 V to 16 V single supply or ±2.5 V to ±8 V dual supply - enabling high-accuracy pH/ORP meter front ends and photodiode transimpedance stages.
For engineers reviewing the AD8669ARUZ datasheet, AD8669ARUZ pinout, AD8669ARUZ application, or AD8669ARUZ equivalent, this page provides verified package mapping (14-lead TSSOP), confirmed quad-channel rail-to-rail output behavior, temperature-stable offset drift (1.5–5 µV/°C), and real-world design values for supply current (275 µA per amp), gain bandwidth (520–540 kHz), and output swing (within 25 mV of rails at 100 µA load).
Technical Context
The AD8669ARUZ implements Analog Devices' patented DigiTrim® trimming for factory-calibrated low offset across temperature, with guaranteed performance over −40°C to +125°C. Its CMOS input stage enables femtoampere-level bias current critical for electrometer-grade applications, while rail-to-rail output swing maximizes dynamic range into low-voltage ADCs.
It supports unity-gain stability with 60°–64° phase margin and exhibits low closed-loop output impedance (100–120 Ω at 100 kHz), enabling direct driving of 2 kΩ loads without external buffering. Channel separation exceeds 120 dB at 1 kHz under ±2.5 V supply, confirming minimal crosstalk in multi-channel instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5 V to 16 V single supply (±2.5 V to ±8 V dual); supports wide-range industrial sensors and battery-backed systems. |
| Input Offset Voltage | Max 175 µV @ 5 V, 300 µV @ 16 V; ensures <0.01% gain error in precision DC amplification paths. |
| Input Bias Current | Max 45 pA @ +85°C; preserves signal integrity in >1 GΩ photodiode or pH electrode interfaces. |
| Voltage Noise Density | 23 nV/√Hz @ 1 kHz; enables sub-µV signal resolution in low-bandwidth sensor front ends. |
| Gain Bandwidth Product | 520–540 kHz; sufficient for stable 10×–100× gain in DC-coupled medical diagnostics and transducer conditioning. |
| Output Swing (RL = 100 kΩ) | Within 25 mV of rails @ 100 µA; delivers full-scale range to 12-bit+ SAR ADCs without level-shifting. |
| Offset Drift | 1.5–5 µV/°C over −40°C to +125°C; maintains calibration stability in unheated field instruments. |
Pinout & Package
AD8669ARUZ is housed in a 14-lead TSSOP (RU-14) package with exposed pad, compliant to JEDEC MO-153-AB-1. Pin 1 is marked by a dot; exposed pad must be connected to V– or left floating per datasheet Note 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output; rail-to-rail capable, drives 2 kΩ minimum load. |
| 2 | –IN A | Inverting input for Amp A; high-impedance CMOS node (300 fA bias). |
| 3 | +IN A | Non-inverting input for Amp A; matched to –IN A for common-mode rejection. |
| 4 | V+ | Positive supply rail; accepts 5–16 V; decoupling capacitor required near pin. |
| 5 | +IN B | Non-inverting input for Amp B; electrically isolated from other inputs. |
| 6 | –IN B | Inverting input for Amp B; independent bias path, no shared substrate coupling. |
| 7 | OUT B | Amplifier B output; identical specs to OUT A; supports independent feedback networks. |
| 8 | OUT C | Amplifier C output; fully buffered, no internal connection to other outputs. |
| 9 | –IN C | Inverting input for Amp C; same layout symmetry as Pins 2 and 6. |
| 10 | +IN C | Non-inverting input for Amp C; referenced to same VCM range (0.2 V to VSY–1.5 V). |
| 11 | V– | Negative supply rail; connects to ground in single-supply mode; exposed pad tied here. |
| 12 | +IN D | Non-inverting input for Amp D; validated for operation down to −40°C ambient. |
| 13 | –IN D | Inverting input for Amp D; matches input capacitance (3 pF typical) of other channels. |
| 14 | OUT D | Amplifier D output; specified for 125°C junction temperature operation. |
Key Features
| Feature | Design Value |
|---|---|
| DigiTrim® offset calibration | Factory-trimmed VOS ≤175 µV at 25°C and ≤450 µV over full −40°C to +125°C range. |
| Rail-to-rail output stage | Delivers VOH ≥4.95 V and VOL ≤25 mV at 5 V supply with 100 µA load - no headroom loss. |
| Femtoampere input bias | IB ≤0.3 pA typ, ≤45 pA max at +85°C - eliminates leakage-induced errors in high-Z sensor nodes. |
| Low 1/f noise corner | en p-p = 2.5 µV p-p (0.1 Hz–10 Hz); critical for precision DC measurements in pH/ORP meters. |
| Extended temperature grade | Specified from −40°C to +125°C; qualified for automotive under-hood and industrial process control. |
Applications
| pH and ORP Meter Front End | Photodiode Transimpedance Amplifier |
|---|---|
Use Scenario: Measuring millivolt-level electrochemical potentials from glass electrodes in aqueous solutions with ±0.001 pH accuracy. IC Role / Device Role / Timing Role: Quad op-amp configured as differential input stage, reference buffer, I-to-V converter, and output driver - all on one die. Use Value: 300 fA input bias prevents electrode polarization; 175 µV offset avoids zero-point calibration drift; rail-to-rail output ensures full ADC utilization. |
Use Scenario: Converting nanoampere photocurrents from UV/visible photodiodes into clean voltage signals for spectral analysis. IC Role / Device Role / Timing Role: Precision transimpedance amplifier (TIA) with guarded input and low-noise feedback network. Use Value: 23 nV/√Hz noise density preserves SNR below 1 kHz; 540 kHz GBP supports fast settling for pulsed-light detection. |
| Medical Diagnostic Instrumentation | Low-Power ADC Driver |
Use Scenario: Signal conditioning for ECG, EEG, or impedance plethysmography where microvolt-level bio-signals require ultra-low drift. IC Role / Device Role / Timing Role: DC-coupled gain stage and active filter before 16-bit sigma-delta ADC. Use Value: 1.5 µV/°C offset drift minimizes thermal recalibration; 100 dB CMRR rejects power-line interference. |
Use Scenario: Driving SAR or delta-sigma ADC inputs in portable gas analyzers or wireless sensor nodes. IC Role / Device Role / Timing Role: Output buffer isolating ADC input from source impedance variations and switching transients. Use Value: 275 µA per amplifier enables multi-channel designs within 1 mA total supply budget; 120 Ω output impedance ensures stable settling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8667ARMZ | Dual-channel version in 8-lead MSOP; same offset (175 µV), noise (23 nV/√Hz), and bias current (300 fA) specs. | Requires two ICs for quad functionality; higher board area and interconnect count vs. AD8669ARUZ's integrated quad. | Select when space allows discrete duals or when channel isolation requirements exceed monolithic quad limits. |
| OPA2189IDGKT | Zero-drift auto-zero architecture; 0.005 µV/°C drift vs. AD8669ARUZ's 1.5 µV/°C; higher supply current (160 µA per amp). | Better for <1 ppm/°C drift-critical applications (e.g., precision weigh scales); less suitable for ultra-low-power remote sensors. | Choose OPA2189IDGKT only if offset drift dominates system error budget and power is secondary. |
Compared with AD8669ARUZ, AD8667ARMZ offers identical per-channel performance but doubles PCB footprint and assembly cost for quad functions, while OPA2189IDGKT trades 6× higher supply current for 300× lower drift - making AD8669ARUZ optimal for battery-powered, wide-temperature, multi-channel analog front ends where balanced noise, power, and accuracy are required.
Availability
AD8669ARUZ is available at Aetrix Electronics and suitable for pH/ORP meters, photodiode amplifiers, and medical diagnostic instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD8669ARUZ 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.
The AD866x family was designed specifically for precision, low-power, high-impedance sensor interface applications - targeting pH meters, electrometers, and medical diagnostics where femtoampere bias and microvolt offset are non-negotiable.
FAQ
What is the maximum supply voltage rating for AD8669ARUZ?
The AD8669ARUZ has an absolute maximum supply voltage of 18 V, with recommended operating range from 5 V to 16 V single supply (or ±2.5 V to ±8 V dual supply). Operation beyond 16 V risks exceeding internal junction temperature limits and invalidates parametric guarantees - always observe derating curves in Figure 34 of the Rev. D datasheet when operating near 16 V at elevated ambient temperatures.
Does AD8669ARUZ support rail-to-rail input common-mode range?
No, AD8669ARUZ features rail-to-rail *output* but not rail-to-rail *input*. Its input common-mode voltage range is specified as 0.2 V to (VSY − 1.5 V) - for example, 0.2 V to 3.0 V at 5 V supply and 0.2 V to 14.5 V at 16 V supply. Input signals outside this range cause increased offset and reduced CMRR, as confirmed in Figures 7 and 10 of the datasheet.
Can AD8669ARUZ drive capacitive loads directly?
AD8669ARUZ is unity-gain stable but exhibits increasing overshoot with capacitive loads above 200 pF - Figure 25 shows 20% overshoot at 1 nF with 5 V supply. For loads >100 pF, use series R-C compensation (e.g., 10 Ω + 100 pF) at the output or isolate with a small-series resistor (20–50 Ω) to maintain phase margin >60° and prevent oscillation in ADC driver configurations.
What is the thermal resistance (θJA) of AD8669ARUZ in its TSSOP package?
The AD8669ARUZ in 14-lead TSSOP (RU-14) has a junction-to-ambient thermal resistance (θJA) of 180°C/W, as specified in Table 4 of the Rev. D datasheet. This value assumes standard JEDEC 2S2P test board conditions; actual θJA drops significantly with proper PCB copper pour under the exposed pad - design guidelines recommend connecting the pad to V– plane with ≥4 thermal vias for best thermal performance.
Is AD8669ARUZ RoHS compliant and lead-free?
Yes, AD8669ARUZ is RoHS compliant and lead-free, indicated by the "Z" suffix in the ordering code per Analog Devices' Ordering Guide (Page 15, Rev. D). It meets EU Directive 2011/65/EU and is compatible with standard Pb-free reflow profiles - peak temperature up to 260°C for 30 seconds, with MSL 1 rating per JEDEC J-STD-020.
AD8669ARUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- DigiTrim®
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- 540 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.3 pA
- Voltage - Input Offset:
- 40 µV
- Current - Supply:
- 230µA (x4 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 16 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
AD8669ARUZ FAQ
1.How can I place an order for AD8669ARUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD8669ARUZ 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 AD8669ARUZ reliable?
The price and inventory of AD8669ARUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD8669ARUZ is usually 5 days.
3.What payment methods are accepted for AD8669ARUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD8669ARUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD8669ARUZ?
AD8669ARUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD8669ARUZ 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 AD8669ARUZ?
For technical support, including AD8669ARUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD8669ARUZ requirements.
6.How does Aetrix verify that AD8669ARUZ is sourced from the original manufacturer or authorized distributors?
All AD8669ARUZ 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 AD8669ARUZ meets industry standards.
7.What is the process for return or replacement of AD8669ARUZ?
All AD8669ARUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD8669ARUZ, 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 AD8669ARUZ part is unused and in its original packaging.
Return procedure for AD8669ARUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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