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Analog Devices Inc. LT1187CN8#PBF
- Part No.:
- LT1187CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Video Amps and Modules
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1187CN8#PBF.pdf
- Description:
- IC AMP DIFFERENTIAL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,092
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Product details
Overview
LT1187CN8#PBF from Analog Devices is a low-power video difference amplifier optimized for ±5V or single 5V operation with gain ≥2, featuring uncommitted high-impedance differential inputs, ±20mA output drive, 165V/µs slew rate, 50MHz –3dB bandwidth at AV = ±2, and integrated shutdown control. It serves as a cable sense amplifier in loop-through video systems with DC adjust capability.
For engineers reviewing the LT1187CN8#PBF datasheet, LT1187CN8#PBF pinout, LT1187CN8#PBF application, or LT1187CN8#PBF equivalent, key selection considerations include its 8-pin PDIP package, 0°C to 70°C temperature grade, ±380mV input voltage limit, CMRR of 70–100dB (DC–10MHz), and compatibility with twisted-pair video transmission up to 1000 feet.
Technical Context
The LT1187CN8#PBF implements a dual-differential-pair input stage with independent +/REF (Pin 1) and –/FB (Pin 5) terminals enabling gain adjustment and DC offset control. Its architecture supports both differential and single-ended configurations while maintaining stable closed-loop operation at gains ≥2 via external resistor networks (RFB/RG).
It integrates a dedicated shutdown terminal (S/D, Pin 5) that reduces supply current to ≤1.5mA and places the output in true high-impedance state (20kΩ || feedback network). The amplifier's 13mA quiescent current and 15mW shutdown power enable multi-amplifier cable sharing without signal contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±5V or single 5V - enables direct interface with legacy video systems and low-voltage logic without level-shifting. |
| –3dB Bandwidth | 50MHz at AV = ±2 - supports full NTSC/PAL chroma subcarrier (3.58MHz) and sound subcarrier (4.5MHz) with margin. |
| Slew Rate | 165V/µs - ensures <25% overshoot and <100ns settling time for 3V steps, critical for multiburst video fidelity. |
| Output Current | ±20mA - drives 75Ω coaxial cables directly or 1kΩ loads with minimal distortion in composite video paths. |
| CMRR | 70–100dB (DC–10MHz) - rejects common-mode noise from long twisted-pair runs and ground loops in broadcast equipment. |
| Input Offset Voltage | 2.0–12.0mV - contributes ≤2mV output error when RFB ≤1kΩ, meeting tight DC accuracy requirements in analog video processing. |
| Shutdown Current | ≤1.5mA - reduces system power by >90% during inactive periods, enabling dynamic channel multiplexing on shared video buses. |
Pinout & Package
LT1187CN8#PBF is housed in an 8-lead plastic DIP (PDIP) package with 0.300-inch width, JEDEC MS-001 compliant, rated for 0°C to 70°C operation and θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+/REF) | Reference/Noninverting Input Control | Accepts DC bias or reference voltage to set output common-mode level; enables single-ended configuration when tied to +IN or –IN. |
| 2 (–IN) | Inverting Input | Differential input node; linear range limited to ±380mV relative to +IN for full response. |
| 3 (+IN) | Noninverting Input | Differential input node; used with Pin 2 for standard differential operation or with Pin 1 for extended-range mode (1.5VP-P). |
| 4 (V–) | Negative Supply Rail | Connects to ground (single 5V) or –5V; also serves as shutdown threshold reference when Pin 5 is pulled to this rail. |
| 5 (S/D) | Shutdown Control | Pulling to V– disables amplifier output (high-Z) and cuts supply current to ≤1.5mA; turn-on/off times are 500ns/600ns. |
| 6 (OUT) | Amplified Output | Delivers ±20mA into 1kΩ or 75Ω loads; maintains 20kΩ || feedback impedance in shutdown state. |
| 7 (V+) | Positive Supply Rail | Accepts +5V (single supply) or +5V (dual supply); bypassing with 0.1µF ceramic + 4.7µF tantalum recommended for fast settling. |
| 8 (–/FB) | Inverting Feedback Input | Connects to feedback network (RFB/RG); sets closed-loop gain as (RFB + RG)/RG; enables cable compensation via capacitor across RFB. |
Key Features
| Feature | Design Value |
|---|---|
| Video-optimized difference amplifier | 50MHz bandwidth and 165V/µs slew rate preserve NTSC/PAL chroma fidelity and edge integrity in composite video signals. |
| Gain-adjustable architecture | External RFB/RG resistors set gain ≥2; Pin 1 (+/REF) and Pin 8 (–/FB) allow DC offset trimming and cable equalization tuning. |
| True high-impedance shutdown | Pin 5 control forces output into 20kΩ || feedback impedance state-enables multiple LT1187CN8#PBF units to share one video bus without loading. |
| Twisted-pair video transmission support | Compensation node at Pin 8 allows 1000pF + 50Ω network to extend system bandwidth from 750kHz to 4MHz over 1000ft twisted-pair. |
| Low-power operation | 13mA supply current at ±5V enables dense integration in multi-channel video processors while limiting thermal rise in PDIP package. |
Applications
| Video Line Receiver | Cable Sense Amplifier |
|---|---|
Use Scenario: Receiving differential video signals over 1000ft twisted-pair in broadcast studio interconnects. IC Role / Device Role / Timing Role: Converts differential input to single-ended output while compensating cable attenuation and phase shift. Use Value: Enables lossless transmission of 3.58MHz chroma and 4.5MHz audio subcarriers using low-cost cabling instead of coaxial. |
Use Scenario: Loop-through monitoring in video routing switchers where input signal must be simultaneously distributed and measured. IC Role / Device Role / Timing Role: High-impedance sensing node with adjustable gain and DC offset to avoid loading source equipment. Use Value: Maintains signal integrity across multiple downstream paths while allowing real-time DC-level adjustment for display calibration. |
| Tape/Disc Drive Signal Conditioning | Composite Video Distribution Amplifier |
Use Scenario: Amplifying playback head signals in professional VTRs where wide bandwidth and low noise are critical. IC Role / Device Role / Timing Role: Low-noise (65nV/√Hz), high-slew-rate buffer amplifying weak analog playback waveforms before ADC conversion. Use Value: Preserves transient detail and harmonic content in high-frequency video components, reducing jitter in digitized output. |
Use Scenario: Driving multiple 75Ω video monitors from a single SDI-to-analog converter output. IC Role / Device Role / Timing Role: Output stage providing ±20mA drive capability and 50MHz bandwidth to maintain sync pulse integrity across parallel loads. Use Value: Eliminates need for active fanout buffers; single LT1187CN8#PBF drives up to four 75Ω terminations without gain droop or timing skew. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar video difference amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1189CS8#PBF | Higher gain optimization (AV ≥10), SO-8 package, same pinout but different internal compensation; 5.7MHz small-signal BW vs 50MHz full-power BW. | Better suited for fixed-gain ≥10 video gain blocks; not recommended for AV = 2–5 cable equalization due to peaking and stability limits. | Select LT1189CS8#PBF only when gain ≥10 and SO packaging are required; verify stability with feedback zeroing for AV < 10. |
| LT6552IMS8#PBF | 3.3V single-supply operation, lower slew rate (110V/µs), 350MHz bandwidth, rail-to-rail output; no shutdown pin. | Targets modern low-voltage embedded video systems; lacks cable compensation node and true high-Z shutdown for multi-amplifier bus sharing. | Choose LT6552IMS8#PBF for 3.3V designs requiring wider bandwidth and rail-to-rail swing; retain LT1187CN8#PBF for ±5V/5V legacy video infrastructure with bus multiplexing. |
Compared with LT1189CS8#PBF and LT6552IMS8#PBF, the LT1187CN8#PBF uniquely balances ±5V/5V flexibility, 50MHz full-power bandwidth, integrated shutdown for cable sharing, and explicit cable compensation capability-making it the optimal choice for legacy broadcast and industrial video distribution where gain ≥2 and bus arbitration are mandatory.
Availability
LT1187CN8#PBF is available at Aetrix Electronics and suitable for video line receivers, cable sense amplifiers, tape/disc drive signal conditioning, and composite video distribution amplifiers requiring stable component supply across industrial and broadcast equipment lifecycles.
Supply support for LT1187CN8#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) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs, serving precision instrumentation, communications, and industrial markets.
The LT1187CN8#PBF belongs to Linear's video difference amplifier product line, engineered specifically for high-fidelity analog video signal conditioning in broadcast, medical imaging, and test equipment where bandwidth, slew rate, and cable drive capability are critical.
FAQ
What is the maximum input differential voltage the LT1187CN8#PBF can handle without clipping?
The LT1187CN8#PBF has a specified input voltage limit of ±380mV between Pins 2 (–IN) and 3 (+IN) under standard configuration. This corresponds to 760mVP-P linear range. Exceeding this causes the first differential pair to saturate, though extended-range operation (up to 1.5VP-P) is possible by reconfiguring Pins 1 and 2 as inputs per the datasheet Figure 6. The LT1187CN8#PBF's input stage design enforces this limit to maintain closed-loop stability and minimize distortion.
Can the LT1187CN8#PBF operate from a single 5V supply, and what are the output swing limitations?
Yes, the LT1187CN8#PBF supports single 5V operation with V+ = 5V and V– = 0V, and VREF = 2.5V applied to Pin 1. Under these conditions, the output swings from 0.15V to 4.0V into a 300Ω load, and from 0.15V to 3.6V into a 1kΩ load. This rail-to-rail–adjacent swing accommodates standard 1VPP composite video levels while preserving headroom for sync pulses. The LT1187CN8#PBF achieves this via internal level-shifting circuitry that maintains performance parity with dual-supply operation.
How does the shutdown feature of the LT1187CN8#PBF function, and what is its impact on output impedance?
The LT1187CN8#PBF enters shutdown when Pin 5 (S/D) is pulled to V–, reducing supply current to ≤1.5mA and placing the output in a true high-impedance state of 20kΩ in parallel with the external feedback network. This prevents loading of shared video buses and enables seamless channel multiplexing. Turn-off occurs within 600ns; turn-on requires 500ns. The LT1187CN8#PBF maintains this impedance regardless of feedback resistor values, ensuring predictable bus behavior during transitions.
Is the LT1187CN8#PBF pin-compatible with other members of the LT118x family, and which ones?
Yes, the LT1187CN8#PBF is explicitly stated as LT1193-pin-compatible in the datasheet Features section. It shares identical pinout and footprint with LT1193CN8, LT1189CN8, and LT1194CN8 in PDIP packages. However, internal compensation and gain optimization differ: LT1193 targets broader gain range, LT1189 targets AV ≥10, and LT1194 fixes gain = 10. The LT1187CN8#PBF's gain ≥2 optimization and shutdown capability make it non-drop-in for designs relying on those variants' specific AC response.
What package type and temperature range does the LT1187CN8#PBF specify, and how does it differ from LT1187IN8#PBF?
The LT1187CN8#PBF uses an 8-lead plastic DIP (PDIP) package rated for 0°C to 70°C ambient operation. In contrast, LT1187IN8#PBF uses the same PDIP package but is qualified for –40°C to 85°C, making it suitable for industrial and automotive video applications exposed to wider thermal extremes. Both share identical electrical specifications and pinout; the "C" suffix denotes commercial grade, while "I" indicates industrial grade. The LT1187CN8#PBF is optimized for cost-sensitive broadcast and consumer video equipment operating in controlled environments.
LT1187CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Differential
- Output Type:
- -
- Number of Circuits:
- 1
- -3db Bandwidth:
- 50 MHz
- Slew Rate:
- 165V/µs
- Current - Supply:
- 13 mA
- Current - Output / Channel:
- 20 mA
- Voltage - Supply, Single/Dual (±):
- 4.75V ~ 16V, ±2.38V ~ 8V
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-PDIP
LT1187CN8#PBF FAQ
1.How can I place an order for LT1187CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1187CN8#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 LT1187CN8#PBF reliable?
The price and inventory of LT1187CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1187CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1187CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1187CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1187CN8#PBF?
LT1187CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1187CN8#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 LT1187CN8#PBF?
For technical support, including LT1187CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1187CN8#PBF requirements.
6.How does Aetrix verify that LT1187CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1187CN8#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 LT1187CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1187CN8#PBF?
All LT1187CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1187CN8#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 LT1187CN8#PBF part is unused and in its original packaging.
Return procedure for LT1187CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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