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Analog Devices Inc. LT1122DS8#PBF
- Part No.:
- LT1122DS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1122DS8#PBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:690
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Product details
Overview
LT1122DS8#PBF from Analog Devices (formerly Linear Technology) is a JFET-input operational amplifier optimized for fast-settling, precision analog signal conditioning in 12-bit data acquisition systems. It delivers 340ns settling time to 1mV after a 10V step, 80V/µs slew rate, 14MHz gain-bandwidth product, and 120µV typical input offset voltage - enabling high-fidelity buffering and amplification in DAC output stages and sample-and-hold circuits.
For engineers reviewing the LT1122DS8#PBF datasheet, LT1122DS8#PBF pinout, LT1122DS8#PBF application, or LT1122DS8#PBF equivalent, key selection considerations include its unity-gain stability with 60° phase margin, low 10pA input bias current at 25°C, ±12.4V output swing into 2kΩ, and SO-8 package compatibility with high-speed layout requirements.
Technical Context
The LT1122DS8#PBF uses a proprietary poly-gate JFET process to minimize gate series resistance and gate-to-drain capacitance, preserving transistor matching while enabling wide bandwidth. Its internal compensation ensures unity-gain stability without external components, yet maintains 14MHz bandwidth at only 7.8mA 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 500pF to 100pF; connecting a 15kΩ resistor to ground reduces slew rate by 25% while improving phase margin and raising stable capacitive load capability to 800pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 80V/µs typical - enables clean amplification of fast transient signals without slewing distortion in DAC output buffers. |
| Settling Time | 340ns to 1mV after 10V step - guarantees full 12-bit accuracy (<0.025% error) within sub-microsecond windows. |
| Gain-Bandwidth Product | 14MHz - supports stable closed-loop gain ≥10 up to ~1.4MHz, suitable for active filter and signal conditioning stages. |
| Input Offset Voltage | 120µV typical - contributes ≤0.02% of full-scale error in 10V-range 12-bit systems (LSB = 2.44mV). |
| Input Bias Current | 10pA typical at 25°C - minimizes voltage error across high-impedance feedback or sensor networks (e.g., <1µV error on 100MΩ source). |
| Output Voltage Swing | ±12.4V into 2kΩ - delivers rail-to-rail usable dynamic range for ±15V supplies, critical for maximizing SNR in precision ADC drivers. |
| Supply Current | 7.8mA typical - balances speed and power efficiency for battery-sensitive or thermally constrained embedded systems. |
Pinout & Package
S8 package: 8-lead plastic small-outline (SO), narrow body (0.150"), RoHS-compliant lead-free finish, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOS TRIM | Offset null adjustment terminal - connects to external potentiometer (≥10kΩ) between V+ and V– for fine-tuning input offset voltage. |
| 2 | –IN | Inverting input - high-impedance JFET node; requires matched trace routing and guard ring for optimal CMRR and noise performance. |
| 3 | +IN | Non-inverting input - symmetrical high-impedance JFET node; must be routed with equal length and impedance to Pin 2. |
| 4 | V– | Negative supply rail - low-impedance connection required; decoupling capacitor (0.1µF ceramic + 1µF tantalum) must be placed adjacent to this pin. |
| 5 | OUT | Amplifier output - capable of driving ≥2kΩ loads; layout must minimize parasitic inductance when sourcing/sinking >10mA. |
| 6 | V+ | Positive supply rail - identical decoupling requirement as Pin 4; shared ground plane essential for PSRR integrity. |
| 7 | SPEED BOOST / OVERCOMP | Input stage bias control - externally configurable to trade bandwidth/stability for improved capacitive drive capability. |
| 8 | VOS TRIM | Second offset trim terminal - used with Pin 1 to form balanced null network; not internally connected to amplifier core. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable with 60° phase margin | Enables direct use in gain-of-1 configurations (e.g., voltage followers) without external compensation, reducing BOM count and layout complexity. |
| 100% tested 340ns settling time | Guarantees timing-critical performance in automated test equipment and real-time control loops where deterministic latency is mandatory. |
| 10pA input bias current (25°C) | Preserves signal integrity in high-Z sensor interfaces (e.g., piezoelectric transducers, photodiode TIA feedback) without requiring guard traces or active bias cancellation. |
| Poly-gate JFET input process | Delivers superior matching and lower gate leakage vs. standard JFETs, directly enabling low drift and high CMRR (>82dB) over temperature. |
| Configurable Speed Boost terminal | Allows system-level optimization: boost mode for fastest settling in DAC buffers; reduced-current mode for improved stability driving long cables or capacitive loads. |
Applications
| Fast 12-Bit DAC Output Amplifier | High-Speed Sample-and-Hold Amplifier |
|---|---|
Use Scenario: Amplifying the current-output stage of a 12-bit DAC (e.g., LTC1590) to produce a precise, low-distortion voltage output for ADC reference or analog control paths. IC Role / Device Role / Timing Role: Final-stage buffer and level shifter; settles within 340ns to ensure full 12-bit accuracy before next conversion cycle begins. Use Value: Eliminates settling-induced code-dependent errors; measured THD+N remains <0.001% at 1kHz, preserving dynamic range in audio and instrumentation systems. | Use Scenario: Capturing transient waveforms in digital oscilloscopes or automated test equipment where aperture uncertainty must be minimized. IC Role / Device Role / Timing Role: High-impedance hold amplifier with low droop rate; driven by fast-switching analog multiplexers or CMOS switches. Use Value: 10pA input bias current limits hold capacitor discharge to <0.1mV/s on 1nF, enabling >1ms hold times without active refresh circuitry. |
| Active Filter for Data Acquisition | Peak Detector in RF Power Monitoring |
Use Scenario: Implementing 4th-order anti-aliasing or reconstruction filters in sigma-delta ADC front-ends or DAC output smoothing networks. IC Role / Device Role / Timing Role: Gain stage in multiple-feedback (MFB) or state-variable topology; operates at closed-loop gains of 2–10 with stable phase response. Use Value: 14MHz GBW supports filter cutoff frequencies up to 1.4MHz with <0.1dB passband ripple, meeting Class 1 DAQ standards. | Use Scenario: Detecting and holding peak amplitude of pulsed RF envelope signals (e.g., radar pulse detection, RF power meter front-end). IC Role / Device Role / Timing Role: Precision diode-driver amplifier with ultra-low input current; drives Schottky diode (e.g., 1N5712) in active peak detector configuration. Use Value: 4pA input offset current prevents diode forward-voltage error accumulation; 80V/µs slew rate captures 100ns-wide pulses with <1% amplitude error. |
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 | Lower slew rate (23V/µs min), higher input offset voltage (250µV max), same SO-8 footprint. | Better DC precision but insufficient speed for <500ns settling requirements; suited for DC-coupled sensor interfaces. | Select LT1022CN8#PBF only when settling time is non-critical and offset voltage dominates design constraints. |
| LTC6244IS8#PBF | CMOS input (1pA IB), higher bandwidth (50MHz), but lower output drive (±11V into 2kΩ) and no Speed Boost pin. | Superior noise performance (1.5µVP-P) and rail-to-rail input, but lacks guaranteed settling time spec and unity-gain stability margin. | Choose LTC6244IS8#PBF for ultra-low-power, low-noise applications where speed is secondary to input current and noise floor. |
Compared with LT1022CN8#PBF and LTC6244IS8#PBF, the LT1122DS8#PBF uniquely combines guaranteed sub-microsecond settling, JFET input robustness against ESD and high common-mode voltages, and user-configurable bandwidth/stability via Pin 7 - making it irreplaceable in time-critical 12-bit data path conditioning.
Availability
LT1122DS8#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, precision DAC output buffering, and fast sample-and-hold amplifier designs requiring stable component supply across industrial and test equipment lifecycles.
Supply support for LT1122DS8#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear op amps including the LT1122 family.
The LT1122DS8#PBF belongs to Linear's high-speed precision JFET op amp product line, engineered specifically for applications demanding both nanosecond-scale settling and microvolt-level DC accuracy - such as automated test equipment, medical imaging front-ends, and high-resolution data converters.
FAQ
What is the maximum capacitive load the LT1122DS8#PBF can drive stably in unity-gain configuration?
The LT1122DS8#PBF is unity-gain stable with up to 500pF capacitive load when Pin 7 (Speed Boost) is left unconnected. If Pin 7 is shorted to V+, stable drive drops to 100pF due to reduced phase margin; if a 15kΩ resistor pulls Pin 7 to ground, stable capacitive load increases to 800pF. Always verify stability with actual PCB layout parasitics using the recommended 0.1µF + 1µF supply bypass network adjacent to Pins 4 and 6. The LT1122DS8#PBF datasheet specifies these limits under standard test conditions.
Does the LT1122DS8#PBF require external compensation for gain-of-10 operation?
No, the LT1122DS8#PBF is internally compensated for unity-gain stability and remains stable at all closed-loop gains ≥1 without external compensation components. Its 60° phase margin at unity gain ensures robust performance even with moderate PCB parasitics. For gain-of-10 operation, the dominant pole is naturally shifted to ~1.4MHz, well within the 14MHz GBW envelope. The LT1122DS8#PBF maintains ≥45° phase margin across the full operating temperature range (–40°C to +85°C) per its characterization data.
How does the Speed Boost terminal (Pin 7) affect power consumption of the LT1122DS8#PBF?
Shorting Pin 7 to V+ increases supply current by ~1.2mA (from 7.8mA to ~9.0mA typical), directly correlating with the 25% slew rate and bandwidth boost. Conversely, pulling Pin 7 to ground with a 15kΩ resistor draws ~1mA from that node, reducing total supply current by ~0.8mA (to ~7.0mA typical). These adjustments are linear and repeatable across the LT1122DS8#PBF production lot. Power dissipation changes remain within safe limits for the SO-8 package (θJA = 190°C/W).
Can the LT1122DS8#PBF operate from ±5V supplies?
Yes, the LT1122DS8#PBF has a minimum supply voltage of ±5V, verified by offset voltage testing at those rails. At ±5V, it delivers 35V/µs typical slew rate and 6MHz gain-bandwidth product while maintaining 120µV typical input offset voltage. Output swing reduces to ±3.8V into 2kΩ, and settling time degrades to ~500ns (still sufficient for many 12-bit applications). The LT1122DS8#PBF retains full functionality and specified AC performance down to ±5V, making it viable for low-voltage portable instrumentation.
What is the purpose of the dual VOS TRIM pins (1 and 8) on the LT1122DS8#PBF?
Pins 1 and 8 form a balanced offset null network: Pin 1 connects to the wiper of a 10kΩ–100kΩ potentiometer, while Pin 8 connects to the opposite end; the other end ties to V+. This configuration applies opposing correction currents to the input differential pair, minimizing thermal drift and common-mode sensitivity. Unlike single-potentiometer op amps, this dual-terminal scheme achieves <0.5µV/°C drift improvement. The LT1122DS8#PBF datasheet specifies ±4mV trim range at 25°C, and the network must be shielded from noise sources to avoid injecting error.
LT1122DS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1122DS8#PBF FAQ
1.How can I place an order for LT1122DS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1122DS8#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 LT1122DS8#PBF reliable?
The price and inventory of LT1122DS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1122DS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1122DS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1122DS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1122DS8#PBF?
LT1122DS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1122DS8#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 LT1122DS8#PBF?
For technical support, including LT1122DS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1122DS8#PBF requirements.
6.How does Aetrix verify that LT1122DS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1122DS8#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 LT1122DS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1122DS8#PBF?
All LT1122DS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1122DS8#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 LT1122DS8#PBF part is unused and in its original packaging.
Return procedure for LT1122DS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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