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Analog Devices Inc. LT1122CS8#PBF
- Part No.:
- LT1122CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1122CS8#PBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:105
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Product details
Overview
LT1122CS8#PBF from Analog Devices (formerly Linear Technology) is a high-speed, JFET-input operational amplifier optimized for fast-settling 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 - enabling precision buffering and amplification in DAC output stages and sample-and-hold circuits.
For engineers reviewing the LT1122CS8#PBF datasheet, LT1122CS8#PBF pinout, LT1122CS8#PBF application, or LT1122CS8#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, SO-8 package compatibility, and operation across –40°C to +85°C.
Technical Context
The LT1122CS8#PBF employs a proprietary poly-gate JFET process that minimizes 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 14 MHz GBW 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 by 25% while improving phase margin and raising stable capacitive load limit to 800 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 80 V/µs typical - enables accurate amplification of fast transient signals without slewing distortion in DAC output buffers. |
| Settling Time | 340 ns to 1 mV (10 V step) - guarantees full 12-bit accuracy within sub-microsecond window for high-throughput data conversion. |
| Gain-Bandwidth Product | 14 MHz - supports stable closed-loop gain configurations up to ~14× at DC, critical for active filter and integrator designs. |
| Input Bias Current | 10 pA max at 25°C - preserves signal integrity in high-impedance sensor interfaces and peak detectors. |
| Input Offset Voltage | 120 µV typical - ensures ≤0.05 LSB error in 12-bit systems (±10 V full scale), minimizing calibration burden. |
| Supply Current | 7.5 mA typical - balances speed and power efficiency for battery-sensitive or thermally constrained embedded systems. |
| Unity-Gain Phase Margin | 60° - provides robust stability with resistive feedback and moderate capacitive loads without external compensation. |
Pinout & Package
S8 package: 8-lead plastic small-outline (SO), narrow body (0.150″), lead-free finish, rated for –40°C to +85°C operation. Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–IN) | Differential input node; high-impedance JFET gate with 4 pF input capacitance - requires careful layout to minimize stray coupling. |
| 2 | Non-Inverting Input (+IN) | Differential input node; matched to Pin 1 for CMRR >82 dB - used for noninverting configurations or reference biasing. |
| 3 | Negative Supply (V–) | Ground or negative rail connection; must be decoupled with 0.1 µF ceramic + 1 µF tantalum close to pin. |
| 4 | Positive Supply (V+) | Positive rail connection; same decoupling requirement as Pin 3 - low-impedance path essential for 20 MHz bandwidth stability. |
| 5 | Offset Trim (VOS TRIM) | Adjustment terminal for external potentiometer (≥10 kΩ) between V+ and V– - nulls input offset to ±4 mV range. |
| 6 | Output (OUT) | Class AB output stage capable of ±12 V swing into 2 kΩ - drives DAC summing nodes and active filter loads directly. |
| 7 | Speed Boost / Overcomp | Current-sinking node controlling input stage bias - configures speed/stability trade-off via external resistor or direct tie to V+. |
| 8 | Not Connected (NC) | No internal connection - left unconnected per datasheet; not used for thermal pad or grounding. |
Key Features
| Feature | Design Value |
|---|---|
| 100% tested settling time | 340 ns to 1 mV (10 V step) - eliminates post-production screening for time-critical DAQ applications. |
| JFET input architecture | 10 pA input bias current at 25°C - enables integration in high-Z sample-and-hold and log amplifier topologies without leakage-induced drift. |
| Unity-gain stable design | 60° phase margin with no external compensation - simplifies PCB layout and reduces BOM count in gain-of-one buffer stages. |
| Configurable speed/stability | Pin 7 allows ±25% slew rate adjustment with corresponding phase margin shift - supports optimization for specific load conditions. |
| Low 0.1 Hz–10 Hz noise | 3.0 µVP-P - minimizes low-frequency drift in precision integrators and DC-coupled instrumentation paths. |
Applications
| Fast 12-Bit DAC Output Amplifier | High-Speed Sample-and-Hold Amplifier |
|---|---|
Use Scenario: Amplifying voltage output of 12-bit current-steering DACs (e.g., LTC1590) in automated test equipment requiring <1 µs settling to full-scale accuracy. IC Role / Device Role / Timing Role: Final-stage buffer driving summing node; settles 10 V step within 340 ns to ≤1 mV error, preserving monotonicity and linearity. Use Value: Eliminates need for external settling-time verification circuitry; enables single-cycle update rates in real-time control loops. | Use Scenario: Capturing transient waveforms in oscilloscope front-ends where aperture uncertainty must be <100 ps over 100 ns hold intervals. IC Role / Device Role / Timing Role: High-impedance track-mode amplifier feeding MOSFET switch and hold capacitor; 10 pA bias current prevents droop during hold. Use Value: Achieves <0.01% droop over 10 µs hold time with 1 nF capacitor - extends effective resolution beyond 12 bits. |
| Active Filter for Communication Channels | Peak Detector in RF Power Monitoring |
Use Scenario: 2nd-order Sallen-Key low-pass filter in baseband signal conditioning for 10 Mbps serial links with strict THD+N <0.01%. IC Role / Device Role / Timing Role: Gain stage with 14 MHz GBW supporting Q-factor tuning and passband flatness up to 1.2 MHz (power bandwidth). Use Value: Maintains <0.1 dB ripple to 1 MHz while rejecting out-of-band noise - improves SNR in ADC-driven receivers. | Use Scenario: Detecting envelope peaks of 100 kHz–1 MHz RF carrier signals in cellular PA monitoring, requiring <10 ns rise time and minimal overshoot. IC Role / Device Role / Timing Role: High-slew-rate comparator-like amplifier driving Schottky diode; 80 V/µs slew rate captures fast transients without lag. Use Value: Delivers <5 ns rise time into 100 pF load - enables accurate RMS-to-DC conversion with <0.5% 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 | 23 V/µs min slew rate, 250 µV max VOS, 8-lead PDIP only - slower and less precise than LT1122CS8#PBF. | Targeted at general-purpose high-speed buffering where 340 ns settling is not required. | Select when cost sensitivity outweighs speed/accuracy needs and SO-8 footprint is not mandatory. |
| LTC6244HS8#PBF | 50 MHz GBW, 1 pA IB, but CMOS input - higher noise (1.5 µVP-P), lower drive capability (±25 mA), and no Speed Boost pin. | Better for ultra-low-current sensor interfaces; unsuitable for high-voltage (>±12 V) or high-drive applications. | Choose for low-power, high-impedance front-ends where 12-bit settling time is secondary to input current. |
Compared with LT1022CN8#PBF and LTC6244HS8#PBF, the LT1122CS8#PBF uniquely combines JFET-input precision, 340 ns verified settling, and configurable speed - making it irreplaceable in time-critical 12-bit DAC output stages where both speed and DC accuracy are simultaneously demanded.
Availability
LT1122CS8#PBF is available at Aetrix Electronics and suitable for fast-settling data acquisition systems, high-speed analog front-ends, and precision instrumentation requiring stable component supply across industrial temperature ranges.
Supply support for LT1122CS8#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 measurement, power management, and signal chain applications.
The LT1122CS8#PBF belongs to Linear Technology's legacy high-speed precision op amp family, designed specifically for 12-bit and faster data conversion systems where settling time, input impedance, and DC accuracy must coexist without compromise.
FAQ
What is the guaranteed settling time specification for LT1122CS8#PBF?
The LT1122CS8#PBF has 100% tested settling time of 340 ns to 1 mV for a 10 V step under standard test conditions (AV = –1, fixed 5–17 pF feedback capacitor). This is guaranteed for C-grade devices (–40°C to +85°C) and documented in the Electrical Characteristics table on page 3 of the official datasheet.
Can LT1122CS8#PBF drive capacitive loads, and what is the maximum stable value?
Yes - the LT1122CS8#PBF can drive capacitive loads stably. With default configuration (Pin 7 open), it handles up to 500 pF. When Pin 7 is tied to V+, stable load drops to 100 pF; when a 15 kΩ resistor connects Pin 7 to ground, stable load increases to 800 pF. These values are measured and specified in the Applications Information section (page 8).
Does LT1122CS8#PBF require external compensation for unity-gain stability?
No - the LT1122CS8#PBF is internally compensated and unity-gain stable with 60° phase margin. No external compensation components are needed for AV ≥ 1 configurations. However, for optimal performance with reactive feedback networks or heavy capacitive loads, the Speed Boost pin (Pin 7) may be used to adjust stability margins as described in the datasheet.
What is the input offset voltage range for LT1122CS8#PBF across temperature?
The LT1122CS8#PBF (C-grade) has a maximum input offset voltage of 1400 µV over the full –40°C to +85°C range, with a typical value of 350 µV at 25°C. Its average temperature coefficient is 5–18 µV/°C, meaning offset drift remains bounded and predictable in precision applications requiring long-term DC stability.
Is LT1122CS8#PBF pin-compatible with other LT1122 variants like LT1122CN8#PBF?
Yes - all LT1122 variants (N8, J8, S8 packages) share identical 8-pin functional mapping and electrical specifications within grade limits. The LT1122CS8#PBF uses the same pinout as LT1122CN8#PBF (SO-8 vs. PDIP), allowing direct PCB footprint substitution where package height and thermal requirements permit.
LT1122CS8#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
LT1122CS8#PBF FAQ
1.How can I place an order for LT1122CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1122CS8#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 LT1122CS8#PBF reliable?
The price and inventory of LT1122CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1122CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1122CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1122CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1122CS8#PBF?
LT1122CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1122CS8#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 LT1122CS8#PBF?
For technical support, including LT1122CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1122CS8#PBF requirements.
6.How does Aetrix verify that LT1122CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1122CS8#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 LT1122CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1122CS8#PBF?
All LT1122CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1122CS8#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 LT1122CS8#PBF part is unused and in its original packaging.
Return procedure for LT1122CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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