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Analog Devices Inc. AD745KRZ-16
- Part No.:
- AD745KRZ-16
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD745KRZ-16.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,898
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Product details
Overview
AD745KRZ-16 from Analog Devices is an ultralow-noise, high-speed, FET-input operational amplifier optimized for gains ≥ +5 (or –4). It delivers 2.9 nV/√Hz input voltage noise at 10 kHz, 12.5 V/µs slew rate, and 20 MHz gain bandwidth product, with 0.5 mV max input offset voltage and 250 pA max input bias current at 25°C. It serves as a precision preamplifier in photodiode, accelerometer, and hydrophone signal chains.
For engineers reviewing the AD745KRZ-16 datasheet, AD745KRZ-16 pinout, AD745KRZ-16 application, or AD745KRZ-16 equivalent, key selection criteria include low-frequency noise performance (0.38 µV p-p, 0.1 Hz to 10 Hz), current noise (6.9 fA/√Hz at 1 kHz), output phase reversal immunity, and SOIC-16 package compatibility with high-impedance sensor interfaces.
Technical Context
The AD745KRZ-16 uses a BiFET architecture combining JFET input stage for ultralow input bias current (≤250 pA) with bipolar-like voltage noise performance. Its internal compensation is optimized for closed-loop gains of +5 or greater, enabling 20 MHz bandwidth and stable operation without external compensation.
This op amp exhibits no output phase reversal when common-mode voltage exceeds –10.7 V, supports ±4.8 V to ±18 V dual supply operation, and maintains open-loop gain ≥2000 V/mV (min) into 2 kΩ loads - critical for high-gain, low-drift transducer amplification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 2.9 nV/√Hz @ 10 kHz - enables low-noise amplification of high-impedance sources >100 kΩ |
| Current Noise | 6.9 fA/√Hz @ 1 kHz - equivalent to Johnson noise of ~345 MΩ resistor, minimizing current-induced errors |
| Slew Rate | 12.5 V/µs - supports fast settling (5 µs to 0.01%) for wideband pulse and audio applications |
| Gain Bandwidth Product | 20 MHz @ G = –4 - provides usable bandwidth up to ~4 MHz at G = +5, suitable for sensor preamp stages |
| Input Offset Voltage | 0.5 mV max - ensures ≤0.5 mV dc error at unity gain, critical for precision charge amplifiers |
| Input Bias Current | 250 pA max @ 25°C - reduces voltage error across high-value feedback resistors (e.g., 100 MΩ) |
| Common-Mode Range | +13.3 V / –10.7 V - allows direct interfacing with ±15 V powered sensors without level-shifting |
Pinout & Package
AD745KRZ-16 is housed in a 16-lead SOIC (R) package (JEDEC MS-013AC, 7.60 mm × 10.65 mm body, 1.27 mm pitch). Pin 1 is marked by a notch or dot; device is ESD-sensitive (Class 1 per MIL-STD-883C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null | Connects to external potentiometer for fine-tuning input offset voltage |
| 2 | Inverting Input (–) | High-impedance FET input node; requires matched source impedance for optimal CMRR and noise |
| 3 | Noninverting Input (+) | High-impedance FET input node; must be balanced with Pin 2 for dc and ac performance |
| 4 | –VS | Negative supply rail; decoupling capacitor required near pin for stability |
| 5 | Offset Null | Second terminal of offset null potentiometer; referenced to Pin 1 |
| 6 | Output | Capable of ±13.6 V / ±12.6 V swing into 600 Ω; drives capacitive loads ≤10 pF directly |
| 7 | +VS | Positive supply rail; decoupling capacitor required near pin for stability |
| 8 | NC | No connect - internally unused; must remain unconnected |
| 9–16 | NC | All remaining pins (9–16) are no-connect; not bonded or functional |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow 0.1–10 Hz noise | 0.38 µV p-p - minimizes drift and baseline wander in DC-coupled sensor front-ends |
| No output phase reversal | Immune to polarity inversion when common-mode voltage exceeds –10.7 V - eliminates latch-up risk in overvoltage transients |
| High open-loop gain | ≥2000 V/mV (min) - ensures <0.05% gain error at G = +100, critical for precision instrumentation |
| Internal compensation | Stable at G ≥ +5 - eliminates need for external compensation components in high-gain configurations |
| Wide supply range | ±4.8 V to ±18 V - supports operation from low-power ±5 V systems to industrial ±15 V rails |
Applications
| Photodiode Amplifier | Accelerometer Signal Chain |
|---|---|
Use Scenario: Amplifying low-level current from silicon photodiodes in spectroscopy or medical pulse oximetry. IC Role / Device Role / Timing Role: Transimpedance amplifier (TIA) with 100 kΩ–100 MΩ feedback resistor, operating at 100 kHz–1 MHz bandwidth. Use Value: 6.9 fA/√Hz current noise prevents degradation of SNR when RF > 1 MΩ; 12.5 V/µs slew rate avoids distortion on fast optical pulses. | Use Scenario: Conditioning charge-output signals from piezoelectric accelerometers (e.g., PCB 352C33) in structural health monitoring. IC Role / Device Role / Timing Role: Charge amplifier with 1250 pF feedback capacitor and 110 MΩ bias resistor, providing 0.8 mV/pC sensitivity. Use Value: 0.38 µV p-p 0.1–10 Hz noise preserves low-frequency vibration signatures; no phase reversal prevents false triggers during shock events. |
| Hydrophone Preamplifier | High-Fidelity Audio DAC Output Stage |
Use Scenario: Low-noise amplification of underwater acoustic signals from B&K 8100 hydrophones (7500 pF source capacitance). IC Role / Device Role / Timing Role: High-Z follower with dc servo loop (AD711-based) and 10⁸ Ω bias network, maintaining <10 mV dc offset. Use Value: 2.9 nV/√Hz voltage noise dominates system noise floor below 10 kHz; 250 pA input bias current enables stable 100+ second time constants. | Use Scenario: I-V conversion stage for 20-bit audio DACs (e.g., AD1862) in professional studio equipment. IC Role / Device Role / Timing Role: First-stage transimpedance amplifier with 3 kΩ feedback, followed by 3-pole low-pass filter (728 kHz cutoff). Use Value: THD = 0.0002% @ 1 kHz ensures <–110 dB harmonic distortion; 20 MHz GBW supports flat response through 20 kHz with <2° phase shift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP37GP | Higher input bias current (10 nA typ), higher voltage noise (3.5 nV/√Hz @ 10 kHz), bipolar input | Better slew rate (17 V/µs) but unsuitable for >100 kΩ source impedances due to IB-induced errors | Select OP37GP only when ultra-low voltage noise is secondary to speed and source impedance is <10 kΩ |
| AD829ARZ | Lower input bias current (1.5 pA typ), wider GBW (200 MHz), decompensated (requires min G = +5) | Superior bandwidth for video or RF IF stages, but higher quiescent current (8 mA vs. 10 mA) and less optimized for sub-100 Hz noise | Choose AD829ARZ for >10 MHz signal paths where 0.1–10 Hz noise is not dominant |
Compared with OP37GP and AD829ARZ, the AD745KRZ-16 uniquely balances ultralow 0.1–10 Hz noise (0.38 µV p-p), femtoampere input bias current, and 20 MHz bandwidth - making it irreplaceable in charge-amplifier-based vibration and acoustic sensing where both dc stability and wide dynamic range are mandatory.
Availability
AD745KRZ-16 is available at Aetrix Electronics and suitable for photodiode amplification, piezoelectric accelerometer conditioning, and hydrophone preamplification requiring stable component supply across industrial, test & measurement, and aerospace programs.
Supply support for AD745KRZ-16 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 AD745KRZ-16 belongs to Analog Devices' precision BiFET op amp product line, engineered specifically for low-noise, high-speed sensor signal conditioning in demanding scientific, medical, and industrial instrumentation.
FAQ
What is the maximum recommended supply voltage for AD745KRZ-16?
The absolute maximum supply voltage for AD745KRZ-16 is ±18 V. However, rated performance is specified at ±15 V, and operation at ±18 V may increase quiescent current and input bias current. For optimal long-term reliability and thermal stability, Analog Devices recommends staying within ±15 V unless transient headroom is explicitly required. The AD745KRZ-16 remains fully functional across ±4.8 V to ±18 V, enabling flexible use in both low-voltage portable and full-rail industrial systems.
Does AD745KRZ-16 require external compensation capacitors?
No, AD745KRZ-16 is internally compensated for closed-loop gains of +5 (or –4) and greater. External compensation is unnecessary and not recommended for standard configurations. Attempting to use it at gains below +5 may result in instability or peaking. If lower gain is required, consider using a unity-gain-stable alternative such as the AD823 or AD8610 - the AD745KRZ-16's internal compensation architecture is fixed and cannot be modified.
Can AD745KRZ-16 drive capacitive loads directly?
AD745KRZ-16 can drive capacitive loads up to 10 pF directly without oscillation, provided proper power supply decoupling (0.1 µF ceramic + 10 µF tantalum per rail) is used. For loads >10 pF, isolation resistance (e.g., 50–100 Ω in series with output) or a dedicated buffer stage (e.g., AD823) is required. Driving cables or ADC inputs with >50 pF capacitance without isolation risks instability and degraded pulse response - confirmed by TPC 6 (output impedance vs. frequency) showing rising impedance above 100 kHz.
What is the purpose of Pins 1 and 5 on AD745KRZ-16?
Pins 1 and 5 on AD745KRZ-16 are dedicated offset null terminals. They connect to the two ends of a 10 kΩ potentiometer (wiper to –VS) to adjust input offset voltage to <50 µV. This feature is essential in high-gain DC-coupled applications like charge amplifiers where even 0.1 mV offset translates to significant output error. The AD745KRZ-16 datasheet specifies that offset voltage is guaranteed after five minutes of operation at 25°C, and nulling improves initial accuracy before thermal stabilization.
Is AD745KRZ-16 suitable for single-supply operation?
AD745KRZ-16 is not optimized for true single-supply operation. Its input common-mode range extends to –10.7 V (relative to –VS) and +13.3 V (relative to +VS), requiring dual supplies for full rail-to-rail input capability. While it can operate with +5 V and ground (i.e., +5 V / 0 V), the input range becomes severely limited (≈0 V to +2.3 V), and output swing drops to ~±1.5 V. For single-supply designs, Analog Devices recommends alternatives such as the AD8605 or ADA4898-1 - the AD745KRZ-16's architecture assumes symmetric dual-rail biasing.
AD745KRZ-16 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 12.5V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- 20 MHz
- Current - Input Bias:
- 150 pA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 8mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 9.6 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
AD745KRZ-16 FAQ
1.How can I place an order for AD745KRZ-16 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD745KRZ-16 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 AD745KRZ-16 reliable?
The price and inventory of AD745KRZ-16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD745KRZ-16 is usually 5 days.
3.What payment methods are accepted for AD745KRZ-16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD745KRZ-16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD745KRZ-16?
AD745KRZ-16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD745KRZ-16 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 AD745KRZ-16?
For technical support, including AD745KRZ-16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD745KRZ-16 requirements.
6.How does Aetrix verify that AD745KRZ-16 is sourced from the original manufacturer or authorized distributors?
All AD745KRZ-16 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 AD745KRZ-16 meets industry standards.
7.What is the process for return or replacement of AD745KRZ-16?
All AD745KRZ-16 units undergo pre-shipment inspection (PSI). If there is an issue with AD745KRZ-16, 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 AD745KRZ-16 part is unused and in its original packaging.
Return procedure for AD745KRZ-16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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