LT1801CDD - Dual 80MHz Rail-to-Rail Op Amp | Analog Devices
Teilenummer: LT1801CDD ✓ Aktiv| Menge | Stückpreis | Gesamt |
|---|---|---|
| 1 | $3.95 | $3,95 |
| 10 | $3.55 | $35,50 |
| 100 | $3.02 | $302,00 |
| 500 | $2.58 | $1.290,00 |
| 1.000 | $2.18 | $2.180,00 |
LT1801CDD Übersicht
Background knowledge: an operational amplifier (op amp) is a DC-coupled, high-gain electronic voltage amplifier with differential inputs and a single-ended output that forms the basic building block of analog signal conditioning. Op amps sit within the broader hierarchy of linear integrated circuits -> amplifiers -> operational amplifiers. Rail-to-rail variants extend the input common-mode and output swing to within millivolts of each supply rail, removing the headroom loss of older single-supply designs and enabling full use of low-voltage ADC input ranges.
Key features of the LT1801 include a low input offset voltage, low input bias current, rail-to-rail input and output swing, 25 V/us slew rate, 80 MHz gain-bandwidth product, and stable operation on supplies from 2.5 V to 12.6 V (single or dual). The exposed-pad DFN-8 package offers an exposed thermal pad that lowers theta_JA versus an SOIC-8 alternative, helping the part handle momentary short-circuit loads without thermal shutdown in space-constrained layouts.
Architecturally, the LT1801 uses a complementary input stage that combines N-channel and P-channel differential pairs so the common-mode input range reaches both rails without crossover distortion at mid-supply. The output stage is a class AB rail-to-rail design that maintains low quiescent current while sourcing or sinking transient load currents required by the 25 V/us slew rate into 100 pF or more of cable capacitance.
Typical applications include active filters, precision integrators, photodiode transimpedance amplifiers, ADC input buffers, DAC output buffers, portable instrumentation, and battery-powered signal-chain front ends. Design considerations focus on the exposed pad requiring solder connection to a ground copper pour for rated thermal performance, and the rail-to-rail input stage's slightly higher input bias current near the rails, which matters for very-high-impedance sensor interfaces.
Drop-in-Alternativen für LT1801CDD – gleiches Gehäuse, Pin-kompatibel. Bauteile mit anderem Gehäuse, die eine PCB-Überarbeitung erfordern, sind ausgeschlossen.
Schnellvergleichstool – Wählen Sie Alternativbauteile für den Direktvergleich:
LT1801IDD
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LT1801CS8
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LT1801CDD#PBF
✅ Drop-In📋 Referenzalternative (nicht im Katalog)
LT1801CDD Grenzwerte & elektrische Eigenschaften
| Manufacturer | Analog Devices (formerly Linear Technology) |
| Amplifier Type | General Purpose / High Speed Operational Amplifier |
| Number of Circuits | 2 (dual) |
| Gain Bandwidth Product | 80 MHz |
| Slew Rate | 25 V/us |
| Supply Current per Amplifier | approximately 2 mA |
| Supply Voltage Range (Single) | 2.5 V to 12.6 V |
| Input/Output Type | Rail-to-Rail Input and Output |
| Betriebstemperaturbereich | -40C to +85C (commercial grade per package suffix DD) |
| Gehäuse / Bauform | 8-pin DFN (3x3 mm) with exposed pad |
| Montageart | Surface Mount |
| RoHS-Status | Compliant (#PBF suffix versions) |
LT1801CDD Pin-Konfiguration
| Pin 1 | OUTA — Amplifier A output |
| Pin 2 | INA- — Amplifier A inverting input |
| Pin 3 | INA+ — Amplifier A non-inverting input |
| Pin 4 | V- — Negative supply (or GND for single supply) |
| Pin 5 | INB+ — Amplifier B non-inverting input |
| Pin 6 | INB- — Amplifier B inverting input |
| Pin 7 | OUTB — Amplifier B output |
| Pin 8 | V+ — Positive supply |
| Pin 9 | EP — Exposed thermal pad (connect to V- / GND plane) |
Typische Anwendungen
LT1801CDD ist geeignet für 6 Anwendungs: Active Filters and Precision Integrators, ADC Input Buffer and Driver, Photodiode Transimpedance Amplifier, Portable and Battery-Powered Instrumentation, DAC Output Buffer and Reconstruction Filter, Industrial Signal Conditioning and Sensor Interfaces.
Active Filters and Precision Integrators
The LT1801CDD's 80 MHz GBWP and 25 V/us slew rate make it an excellent building block for active Sallen-Key and multiple-feedback filters operating in the 100 kHz to 5 MHz range. Its rail-to-rail input/output preserves dynamic range in low-voltage single-supply filters, while ~2 mA quiescent current per channel keeps thermal load manageable in multi-stage designs. For example, a 2-pole 1 MHz Butterworth low-pass filter using the LT1801CDD delivers > 40 dB stopband attenuation with less than 1 dB passband ripple.
Empfohlen
ADC Input Buffer and Driver
The LT1801CDD drives 12- to 16-bit ADC inputs up to several MSPS without slew-limiting or distortion, thanks to its wide GBWP and low input offset voltage. Its rail-to-rail output lets designers use the full ADC input range even on 3.3 V or 5 V supplies, maximising SNR by 1-2 dB versus non-rail-to-rail drivers. Settling to 0.1 percent within tens of nanoseconds makes it suitable for pipelined and successive-approximation ADCs in data acquisition systems.
Empfohlen
Photodiode Transimpedance Amplifier
With low input bias current and 80 MHz GBWP, the LT1801CDD serves as a transimpedance amplifier for photodiodes and PIN photodetectors in optical receivers and LIDAR front ends. Its rail-to-rail output lets designers maximise signal swing into downstream ADCs or comparators on 3.3 V rails. A typical 10 kohm feedback transimpedance stage achieves bandwidths above 1 MHz with the LT1801CDD, supporting both pulsed-laser and modulated-light sensing.
Empfohlen
Portable and Battery-Powered Instrumentation
The LT1801CDD's ~2 mA per channel quiescent current and 2.5 V minimum supply voltage make it ideal for handheld instruments and IoT sensor nodes running from a single Li-ion cell (3.0 V to 4.2 V) or 2x AA cells. Rail-to-rail input/output preserves measurement range down to ground, while 80 MHz GBWP supports sensor bandwidth up to several hundred kHz. Battery life is extended by 30-50 percent versus comparable higher-current op amps in always-on signal-conditioning paths.
Empfohlen
DAC Output Buffer and Reconstruction Filter
The LT1801CDD buffers high-speed DAC outputs in audio, arbitrary waveform generators, and direct-digital synthesis applications. Its 25 V/us slew rate avoids slew-induced distortion on fast output transitions, while rail-to-rail swing maximises DAC dynamic range on 5 V and 3.3 V supplies. The dual channel allows simultaneous I/Q buffering in communications DACs, and the 80 MHz GBWP supports reconstruction filter cutoffs above 1 MHz for wideband signal synthesis.
Empfohlen
Industrial Signal Conditioning and Sensor Interfaces
The LT1801CDD operates on industrial 24 V bus rails (via local regulation to 5 V or 12 V) and provides the bandwidth and precision needed for strain-gauge, thermocouple, and process-control front ends. Rail-to-rail input lets the amplifier handle sensor signals that swing close to ground, while the dual channel enables simultaneous signal conditioning and reference buffering. Robustness is enhanced by the DFN-8 exposed pad, which lowers thermal resistance in sealed industrial enclosures.
Empfohlen
Zusammenfassung der empfohlenen Produkte
Technische Referenzdaten für LT1801CDD – Vergleich, Designhinweise und Compliance-Informationen.
Auswahlhilfe
Vergleich mit Alternativen
| Parameter | Dieses Produkt | LT1801IDD | LT1801CS8 | LT1801CDD#PBF |
|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | DFN-8 (3x3 mm) exposed pad | DFN-8 (3x3 mm) - same | DFN-8 vs SOIC-8 (NOT a drop-in) | DFN-8 (3x3 mm) - same |
| Number of Channels | 2 (dual) | 2 (dual) | 2 (dual) | 2 (dual) |
| Gain-Bandwidth Product | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Slew Rate | 25 V/us | 25 V/us | 25 V/us | 25 V/us |
| Supply Voltage Range | 2.5 V to 12.6 V single | 2.5 V to 12.6 V | 2.5 V to 12.6 V | 2.5 V to 12.6 V |
| Rail-to-Rail I/O | Yes (input and output) | Yes | Yes | Yes |
| Temperature Grade | Commercial (0C to +70C) | Industrial (-40C to +85C) | Commercial | Commercial |
| RoHS Compliance | Check PBF suffix version | Check PBF suffix version | Check PBF suffix version | Compliant (Pb-free) |
| Approximate Unit Price (qty 1) | $3.95 | Approximately $4.10 | Approximately $3.80 | Approximately $3.95 |
Wichtigste Unterscheidungsmerkmale
- True rail-to-rail input AND output in a compact DFN-8 (vs. LT6200 (older single-supply op amp without rail-to-rail input))
- 80 MHz GBWP at approximately 2 mA quiescent current (vs. AD8052 (110 MHz GBWP but 5 mA per channel))
- Exposed-pad DFN-8 footprint lowers thermal resistance (vs. LT1801CS8 in SOIC-8)
Designhinweise
The 8-pin DFN package dissipates heat through the exposed thermal pad (pin 9). Solder this pad to a grounded copper pour of at least 0.25 square inch to achieve the rated thermal resistance and avoid thermal shutdown under sustained short-circuit loads. Avoid routing signal traces through the pad area, which would interrupt the thermal path.
Place 0.1 uF ceramic bypass capacitors as close as possible to the V+ and V- supply pins, with a short, low-inductance ground return. Add a 10 uF tantalum or ceramic bulk capacitor at the supply entry point for high-transient load conditions. Keep input and feedback traces short to minimise parasitic capacitance that can degrade the 80 MHz GBWP margin.
Do not assume rail-to-rail input means uniform input bias current across the common-mode range; near the rails the bias current increases due to stage transition, which can corrupt very-high-impedance (> 1 Mohm) sensor interfaces. For photodiode TIA applications, operate the input stage away from the rails (mid-supply) or use a dedicated JFET-input op amp.
With 25 V/us slew rate and 80 MHz GBWP, the LT1801CDD can drive cable capacitance beyond 100 pF without oscillation when proper compensation is maintained. However, capacitive loads directly at the output should be isolated with a 20-50 ohm series resistor to preserve phase margin. For long output traces, use a back-termination resistor matched to the cable impedance.
Compliance-Informationen
RoHS compliance applies to #PBF suffix versions per Analog Devices product page. Not AEC-Q100 qualified - choose automotive-grade op amps for vehicular applications. Operating temperature grade is commercial (0C to +70C) for LT1801CDD; industrial (-40C to +85C) for LT1801IDD.
