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Analog Devices Inc. LT1122CCN8#PBF
- Part No.:
- LT1122CCN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1122CCN8#PBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,307
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Product details
Overview
LT1122CCN8#PBF from Analog Devices (formerly Linear Technology) is a JFET-input operational amplifier optimized for fast-settling, high-precision analog signal conditioning in 12-bit data acquisition systems. It delivers 80 V/µs slew rate, 340 ns settling time to 1 mV (10 V step), 14 MHz gain-bandwidth product, and 120 µV typical input offset voltage at ±15 V supply. Its primary circuit role is as a high-speed output buffer and integrator in DAC-based instrumentation.
For engineers reviewing the LT1122CCN8#PBF datasheet, LT1122CCN8#PBF pinout, LT1122CCN8#PBF application, or LT1122CCN8#PBF equivalent, key selection criteria include verified 340 ns settling performance, JFET-input bias current ≤10 pA at 25°C, unity-gain stability with 60° phase margin, and compatibility with ±5 V to ±20 V dual supplies.
Technical Context
The LT1122CCN8#PBF employs a proprietary poly-gate JFET process that minimizes gate series resistance and gate-to-drain capacitance-enabling wide bandwidth without degrading transistor matching. Its internal compensation ensures unity-gain stability while maintaining 14 MHz bandwidth at only 7 mA supply current.
Pin 8 (Speed Boost/Overcomp) provides configurable trade-offs: shorting to V+ increases slew rate and bandwidth by ~25% but reduces phase margin by ~18° and capacitive load tolerance from 500 pF to 100 pF; connecting a 15 kΩ resistor to ground reduces slew rate and bandwidth by 25% while improving phase margin and enabling stable operation with up to 800 pF capacitive loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 80 V/µs typical - enables accurate reproduction of fast transient signals in DAC output stages and sample-and-hold circuits |
| Settling Time | 340 ns to 1 mV (10 V step) - fully tested and guaranteed for 12-bit accuracy (±0.024% of full scale) |
| Gain-Bandwidth Product | 14 MHz - supports stable closed-loop gain ≥10 at >1 MHz, critical for active filter and feedback loop design |
| Input Offset Voltage | 120 µV typical (600 µV max) - ensures <0.006% error in precision voltage amplification and summing applications |
| Input Bias Current | 10 pA typical (75 pA max at 25°C) - preserves signal integrity in high-impedance sensor interfaces and integrators |
| Supply Current | 7.5 mA typical - balances speed and power efficiency for battery- or thermally constrained embedded systems |
| Common-Mode Rejection | 83 dB minimum - maintains accuracy when amplifying small differential signals riding on large common-mode voltages |
Pinout & Package
The LT1122CCN8#PBF is housed in an 8-lead plastic DIP (N8 package), 0.300-inch width, with lead finish RoHS-compliant matte tin. Thermal resistance θJA = 130°C/W in still air.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOS TRIM | Offset null adjustment terminal; connects external potentiometer (≥10 kΩ) between V+ and V– to trim input offset voltage |
| 2 | –IN | Inverting input; high-impedance JFET node with 4 pF input capacitance and ±10.5 V common-mode range |
| 3 | +IN | Non-inverting input; matched to –IN for low input offset current (4 pA typical) |
| 4 | V– | Negative supply rail; accepts –5 V to –20 V; must be decoupled with 0.1 µF ceramic + 1 µF tantalum |
| 5 | NC | No connection; internally unused; must remain unconnected per datasheet |
| 6 | OUT | Amplifier output; drives ≥2 kΩ load to ±12 V swing; capable of sourcing/sinking >20 mA peak |
| 7 | V+ | Positive supply rail; accepts +5 V to +20 V; requires same decoupling as V– |
| 8 | SPEED BOOST/OVERCOMP | Current-sink node controlling input stage bias; enables dynamic optimization of speed vs. stability |
Key Features
| Feature | Design Value |
|---|---|
| 100% tested settling time | 340 ns to 1 mV (10 V step) - eliminates post-manufacturing characterization for time-critical DAC interface designs |
| JFET input architecture | 10 pA typical input bias current - enables direct interfacing with photodiodes, piezoelectric sensors, and high-Z RC networks |
| Unity-gain stable with 60° phase margin | Stable operation at AV = 1 without external compensation - simplifies layout and reduces BOM count in buffer configurations |
| Low 0.1 Hz–10 Hz noise | 3.0 µVP-P - supports precision DC-coupled amplification in weigh scales and medical front-ends |
| Configurable speed/stability via Pin 8 | 25% slew rate adjustment range - allows single part to serve both high-speed acquisition and low-distortion filtering roles |
Applications
| Fast 12-Bit DAC Output Amplifier | High-Speed Sample-and-Hold Amplifier |
|---|---|
Use Scenario: Driving the voltage output stage of a 12-bit current-output DAC (e.g., LTC1590) with 0–10 V range and <1 µs update requirement. IC Role / Device Role / Timing Role: Final-stage precision buffer and level shifter; settles within 340 ns to maintain 12-bit monotonicity across full-scale transitions. Use Value: Eliminates need for external settling verification; guarantees 12-bit accuracy without post-DAC calibration. | Use Scenario: Capturing transient waveforms in automated test equipment with 1 MS/s sampling and <500 ns aperture time. IC Role / Device Role / Timing Role: High-impedance hold amplifier with low droop rate; uses JFET inputs to minimize charge injection during switch transitions. Use Value: Achieves <0.025% droop over 1 µs hold period due to 10 pA input bias current and 4 pF input capacitance. |
| Active Filter for Data Acquisition | Peak Detector in Signal Conditioning |
Use Scenario: 2nd-order anti-aliasing filter preceding a 1 MSPS SAR ADC in industrial PLC analog input modules. IC Role / Device Role / Timing Role: High-Q transconductance amplifier in biquad topology; leverages 14 MHz GBW to maintain filter shape up to 100 kHz. Use Value: Enables sharp roll-off (−40 dB/decade) with <0.1 dB passband ripple - no gain peaking or phase distortion. | Use Scenario: Detecting amplitude peaks of 100 kHz ultrasonic pulses in non-destructive testing equipment. IC Role / Device Role / Timing Role: Precision diode-less peak detector using fast settling and low input current to minimize discharge error. Use Value: Captures 99.9% of true peak within 400 ns and holds with <0.5 mV/min droop at room temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed JFET op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1022CN8#PBF | 23 V/µs min slew rate; 250 µV max VOS; lower bandwidth (1.5 MHz) | Better DC precision but insufficient speed for <500 ns settling requirements | Select when ultra-low offset dominates over speed; not suitable for 12-bit DAC buffering |
| LTC6244CS8#PBF | 50 MHz GBW; 1 pA IB; CMOS input (not JFET); 100 µV max VOS | Higher speed and lower bias current, but lacks JFET's rail-to-rail input common-mode and robust ESD tolerance | Prefer for low-power, high-frequency (>5 MHz) applications where input impedance >1013 Ω is required |
Compared with LT1022CN8#PBF and LTC6244CS8#PBF, the LT1122CCN8#PBF uniquely balances 80 V/µs slew rate, sub-400 ns settling, and JFET input ruggedness-making it the only option among the three qualified for 12-bit DAC output amplification with guaranteed timing performance.
Availability
LT1122CCN8#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, precision instrumentation, and industrial control systems requiring stable component supply across extended production lifecycles.
Supply support for LT1122CCN8#PBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs for precision and high-speed applications.
The LT1122 product line was designed specifically for high-fidelity, fast-settling analog signal paths in 12-bit to 14-bit data conversion systems-emphasizing JFET input integrity, verified settling behavior, and robust dual-supply operation.
FAQ
What is the guaranteed settling time specification for LT1122CCN8#PBF?
The LT1122CCN8#PBF has 100% tested settling time of 340 ns to 1 mV following a 10 V step input under standard test conditions (AV = –1, fixed 5–17 pF feedback capacitor). This specification applies to C-grade devices over –40°C to +85°C and is validated per the settling time test fixture shown in the official datasheet Figure TA02.
Can LT1122CCN8#PBF operate from a single supply?
The LT1122CCN8#PBF is specified for dual-supply operation (±5 V to ±20 V) and does not support true single-supply operation. Its input common-mode range extends to ±10.5 V with ±15 V supplies but does not include the negative rail. For single-supply applications, consider rail-to-rail input/output op amps such as the LTC6244 or ADA4898-1 instead of the LT1122CCN8#PBF.
What is the function of Pin 8 (SPEED BOOST/OVERCOMP) on LT1122CCN8#PBF?
Pin 8 on the LT1122CCN8#PBF controls the input stage bias current. Shorting it to V+ increases slew rate and bandwidth by ~25% but reduces phase margin and capacitive load tolerance. Connecting a 15 kΩ resistor to ground decreases those parameters by ~25% while improving stability. This feature allows one LT1122CCN8#PBF to serve multiple design points without changing the PCB layout.
Is LT1122CCN8#PBF pin-compatible with other grades like LT1122ACN8#PBF?
Yes - all LT1122xN8 variants (A/B/C/D grades in N8 package) share identical pinout, footprint, and electrical interface. The only differences are parametric grading (e.g., VOS, IB, SR limits) and operating temperature range. LT1122CCN8#PBF (–40°C to +85°C) can directly replace LT1122ACN8#PBF in most applications unless tighter initial offset (<350 µV) or wider temp range is required.
Does LT1122CCN8#PBF require external compensation for unity-gain stability?
No - the LT1122CCN8#PBF is internally compensated for unity-gain stability with 60° phase margin. It drives resistive loads ≥2 kΩ stably at AV = 1. For capacitive loads >100 pF, use Pin 8 configuration or external isolation resistor as described in the Applications Information section of the LT1122 datasheet to maintain stability.
LT1122CCN8#PBF 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:
- -
- Slew Rate:
- 75V/µs
- Gain Bandwidth Product:
- 13 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 12 pA
- Voltage - Input Offset:
- 130 µV
- Current - Supply:
- 7.8mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1122CCN8#PBF FAQ
1.How can I place an order for LT1122CCN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1122CCN8#PBF 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 LT1122CCN8#PBF reliable?
The price and inventory of LT1122CCN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1122CCN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1122CCN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1122CCN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1122CCN8#PBF?
LT1122CCN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1122CCN8#PBF 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 LT1122CCN8#PBF?
For technical support, including LT1122CCN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1122CCN8#PBF requirements.
6.How does Aetrix verify that LT1122CCN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1122CCN8#PBF 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 LT1122CCN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1122CCN8#PBF?
All LT1122CCN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1122CCN8#PBF, 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 LT1122CCN8#PBF part is unused and in its original packaging.
Return procedure for LT1122CCN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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