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Analog Devices Inc. AD845JRZ-16
- Part No.:
- AD845JRZ-16
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD845JRZ-16.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:682
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Product details
Overview
AD845JRZ-16 from Analog Devices is a precision N-channel JFET-input operational amplifier in 16-lead SOIC package, delivering 16 MHz unity-gain bandwidth, 100 V/µs slew rate, and 350 ns settling time to 0.01%-designed for high-speed, high-accuracy signal conditioning in data acquisition systems.
For engineers reviewing the AD845JRZ-16 datasheet, AD845JRZ-16 pinout, AD845JRZ-16 application, or AD845JRZ-16 equivalent, key selection criteria include its JFET input stage enabling low bias current (0.5 nA typ), ultra-low 0.25 mV max input offset voltage, and guaranteed stability driving 100 pF/500 Ω loads-critical for ADC buffering and active filter design.
Technical Context
The AD845JRZ-16 employs complementary bipolar (CB) process technology with laser-wafer trimming to achieve DC precision without external nulling. Its JFET input stage provides 10¹¹ Ω input resistance and 4 pF input capacitance, enabling high-impedance sensor interfacing while maintaining wideband AC performance.
Internally compensated and unity-gain stable, it operates over ±4.75 V to ±18 V supplies with 10–12 mA quiescent current. The device drives capacitive loads up to 100 pF in parallel with 500 Ω resistive load while maintaining 0.01% settling in 350 ns-validated per Figure 1 and TPC 25 test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 16 MHz typical - enables stable closed-loop operation at gain = 1 with full small-signal bandwidth |
| Slew Rate | 100 V/µs typical - supports fast 10 V step response without distortion in buffer or driver stages |
| Settling Time | 350 ns to 0.01% - ensures accurate sampling in 12-bit+ data acquisition with minimal aperture error |
| Input Offset Voltage | 0.25 mV maximum - eliminates need for external nulling in most precision instrumentation circuits |
| Input Bias Current | 0.5 nA typical at 25°C - preserves signal integrity in photodiode preamps and high-Z sensor interfaces |
| CMRR | 94 dB minimum at ±10 V common-mode - maintains accuracy in noisy industrial environments |
| Open-Loop Gain | 250 V/mV minimum into 500 Ω - guarantees 12-bit linearity even in unity-gain configurations |
Pinout & Package
AD845JRZ-16 is housed in a 16-lead SOIC (R-16) package per JEDEC MS-013AA, 7.60 mm × 10.30 mm body size, 1.27 mm lead pitch, with exposed pad not present. Pin 1 marked by notch or dot; pin 1 is non-inverting input (+IN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Non-Inverting Input (+IN) | High-impedance JFET input node; connects to signal source in follower or non-inverting configurations |
| 2 | Inverting Input (–IN) | Feedback summing node; used for gain-setting resistor networks in inverting amplifiers |
| 3 | Output (OUT) | Low-impedance buffered output capable of sourcing/sinking 50 mA; drives 500 Ω + 100 pF loads |
| 4 | Negative Supply (–VS) | Connects to negative rail (e.g., –15 V); substrate tied to +VS per metalization photo |
| 5 | Offset Null (NC) | No internal connection; unused terminal per AD845 pinout revision E - not offset adjust |
| 6 | Offset Null (NC) | No internal connection; unused terminal - differs from standard op amp pinout where null pins are active |
| 7 | Positive Supply (+VS) | Connects to positive rail (e.g., +15 V); substrate internally connected to this pin |
| 8 | NC | No internal connection - reserved for process/test; must be left unconnected |
| 9–16 | NC / Reserved | All remaining pins (9–16) are no-connect; confirmed by SOIC pinout diagram and R-16 package definition |
Key Features
| Feature | Design Value |
|---|---|
| JFET input stage with 10¹¹ Ω input resistance | Enables direct interfacing with high-impedance sources (e.g., piezoelectric sensors, pH electrodes) without loading error |
| Laser-trimmed input offset voltage ≤ 0.25 mV | Eliminates manual nulling circuitry in 12-bit systems, reducing BOM count and board area |
| Guaranteed stability driving 100 pF || 500 Ω | Permits direct connection to ADC input capacitors and long PCB traces without external isolation resistors |
| 110 dB CMRR over ±10 V input range | Maintains accuracy in single-ended measurement of differential signals amid ground noise or supply ripple |
| Internal compensation for unity-gain stability | Allows immediate use in gain = 1 configurations (e.g., ADC buffers) without external compensation components |
Applications
| ADC Buffering | Active Filter Design |
|---|---|
|
Use Scenario: Driving the analog input of successive-approximation ADCs (e.g., AD76xx series) during sample-and-hold acquisition phase. IC Role / Device Role / Timing Role: Unity-gain voltage follower providing low-output-impedance, fast-settling drive to switch-capacitor input. Use Value: 350 ns settling to 0.01% ensures full 12-bit code accuracy before conversion start, eliminating aperture uncertainty. |
Use Scenario: Implementing 4th-order Butterworth low-pass filters in medical imaging front-ends requiring <1% passband ripple. IC Role / Device Role / Timing Role: High-speed, low-distortion gain stage in multiple-feedback (MFB) or state-variable topologies. Use Value: 16 MHz bandwidth and 100 V/µs slew rate preserve transient fidelity up to 1.75 MHz full-power bandwidth at ±10 V swing. |
| Photodiode Preamp | High-Speed Integrator |
|
Use Scenario: Transimpedance amplification of low-current photodiode outputs in optical time-domain reflectometers (OTDR). IC Role / Device Role / Timing Role: Low-bias-current, low-noise current-to-voltage converter with 4 mVp-p 0.1–10 Hz noise floor. Use Value: 0.5 nA input bias current minimizes dark-current error; 60 nV/√Hz @ 100 Hz enables sub-picoamp resolution. |
Use Scenario: Precision integration of pulsed current waveforms in laser pulse energy meters and particle detectors. IC Role / Device Role / Timing Role: Low-drift integrator core with laser-trimmed offset enabling >100 µs integration windows. Use Value: 5 µV/°C max offset drift prevents baseline walkover temperature cycles; 250 V/mV open-loop gain ensures linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA605 | Higher 180 V/µs slew rate but 12.5 MHz bandwidth; 1.5 nA bias current; no laser-trimmed offset (typ. 1.5 mV) | Better for >10 MHz pulse amplification; less suitable for DC-coupled 12-bit precision due to higher offset and drift | Select OPA605 when speed dominates over DC accuracy; avoid where offset nulling is impractical |
| LT1363 | Faster 1000 V/µs slew rate, 70 MHz bandwidth, but bipolar input (250 nA bias current); 1.5 mV offset; no JFET input impedance | Superior for video or RF gain blocks; unsuitable for high-Z sensor interfaces or low-current photodiode apps | Choose LT1363 only for low-impedance, wideband AC-coupled paths; reject for precision DC or high-Z applications |
Compared with OPA605 and LT1363, AD845JRZ-16 uniquely combines JFET input impedance, laser-trimmed DC precision, and guaranteed 100 pF capacitive load drive-making it irreplaceable in 12-bit ADC buffering and photodiode preamplification where both speed and DC fidelity are mandatory.
Availability
AD845JRZ-16 is available at Aetrix Electronics and suitable for precision data acquisition, medical instrumentation, and industrial test equipment requiring stable component supply across commercial temperature range (0°C to +70°C).
Supply support for AD845JRZ-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 AD845 belongs to Analog Devices' precision high-speed op amp product line, engineered specifically for applications demanding simultaneous DC accuracy and MHz-range bandwidth-such as 12-bit+ data converters, active filters, and instrumentation-grade signal chains.
FAQ
What is the operating temperature range for AD845JRZ-16?
The AD845JRZ-16 is rated for commercial operation from 0°C to +70°C, as specified in the Ordering Guide. It is not qualified for industrial (–40°C to +85°C) or military (–55°C to +125°C) ranges-those require AD845AQ, AD845BQ, or AD845SQ variants in CERDIP packages. Thermal derating applies above 70°C per SOIC thermal resistance (θJA = 100°C/W).
Does AD845JRZ-16 require external offset nulling?
No, AD845JRZ-16 does not require external offset nulling. Its laser-trimmed input offset voltage is guaranteed ≤ 0.25 mV maximum at 25°C, and drift is limited to 5 µV/°C max-sufficient for 12-bit accuracy in most unity-gain and low-gain configurations. Pins 5 and 6 are NC (no connect), confirming absence of null terminals.
Can AD845JRZ-16 drive a 100 pF capacitor directly?
Yes, AD845JRZ-16 is explicitly characterized and guaranteed to drive 100 pF in parallel with a 500 Ω load while maintaining 350 ns settling to 0.01%, as documented in the "FREQUENCY RESPONSE" section and Figure 1. This capability eliminates need for isolation resistors when buffering switched-capacitor ADC inputs or long PCB traces.
What is the supply voltage range for AD845JRZ-16?
AD845JRZ-16 operates from ±4.75 V to ±18 V dual supplies, with rated performance specified at ±15 V. Quiescent current remains stable between 10–12 mA across this range (TPC 4). Operation below ±4.75 V risks degraded open-loop gain and bandwidth; exceeding ±18 V violates absolute maximum ratings and may cause permanent damage.
Is AD845JRZ-16 unity-gain stable?
Yes, AD845JRZ-16 is unity-gain stable and internally compensated, as confirmed in Product Highlights #3 and General Description. It requires no external compensation components when configured as a unity-gain buffer or inverter-enabling immediate deployment in ADC driver and signal conditioning applications without stability analysis.
AD845JRZ-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:
- 100V/µs
- Gain Bandwidth Product:
- 16 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 750 pA
- Voltage - Input Offset:
- 700 µV
- Current - Supply:
- 10mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 9.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
AD845JRZ-16 FAQ
1.How can I place an order for AD845JRZ-16 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD845JRZ-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 AD845JRZ-16 reliable?
The price and inventory of AD845JRZ-16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD845JRZ-16 is usually 5 days.
3.What payment methods are accepted for AD845JRZ-16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD845JRZ-16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD845JRZ-16?
AD845JRZ-16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD845JRZ-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 AD845JRZ-16?
For technical support, including AD845JRZ-16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD845JRZ-16 requirements.
6.How does Aetrix verify that AD845JRZ-16 is sourced from the original manufacturer or authorized distributors?
All AD845JRZ-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 AD845JRZ-16 meets industry standards.
7.What is the process for return or replacement of AD845JRZ-16?
All AD845JRZ-16 units undergo pre-shipment inspection (PSI). If there is an issue with AD845JRZ-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 AD845JRZ-16 part is unused and in its original packaging.
Return procedure for AD845JRZ-16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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