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Analog Devices Inc. LT1804IDD#PBF
- Part No.:
- LT1804IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT1804IDD#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:666
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Product details
Overview
LT1804IDD#PBF from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail input and output operational amplifier optimized for high-speed, low-voltage signal conditioning. It delivers 100 V/µs slew rate, 85 MHz gain bandwidth product, ±5V or single 3V–12.6V supply operation, 42 mA output drive, and operates across –40°C to 85°C - enabling precision buffering in ADC front-ends, video line drivers, and active filter stages.
For engineers reviewing the LT1804IDD#PBF datasheet, LT1804IDD#PBF pinout, LT1804IDD#PBF application, or LT1804IDD#PBF equivalent, this page provides verified package mapping (8-lead 3mm × 3mm DFN), confirmed dual op-amp circuit role, thermal performance data (θJA = 160°C/W, TJMAX = 125°C for DD), rail-to-rail dynamic range validation, and real-world substitution guidance with documented parameter trade-offs.
Technical Context
The LT1804IDD#PBF employs a dual-input-stage architecture: a PNP pair active near the negative rail and an NPN pair active near the positive rail, enabling true rail-to-rail common-mode input range (VCM = VS– to VS+). Its complementary common-emitter output stage supports rail-to-rail swing within 20 mV of either supply under load.
It maintains stable unity-gain operation with capacitive loads up to 100 pF when series output resistors are used, features 21 nV/√Hz input voltage noise at 10 kHz, and achieves –75 dBc harmonic distortion at 1 MHz with 2 VP–P output - confirming suitability for high-fidelity analog signal paths requiring wide bandwidth and low distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Slew Rate | 100 V/µs - enables clean 10 MHz full-power sine wave reproduction without slewing distortion |
| Gain Bandwidth Product | 85 MHz - supports stable closed-loop gain ≥10 at 8 MHz or ≥2 at 40 MHz |
| Input Common Mode Range | VS– to VS+ - accepts signals at either supply rail, critical for single-supply sensor interfaces |
| Output Swing | Within 20 mV of rails (at light load) - maximizes dynamic range in 3.3V or 5V systems |
| Supply Current per Amplifier | 3.1 mA (typical, –40°C to 85°C) - balances speed and power for portable instrumentation |
| Input Voltage Noise | 21 nV/√Hz @ 10 kHz - suitable for medium-bandwidth precision amplification without added filtering |
| Short-Circuit Current | 35 mA (min, –40°C to 85°C) - sustains robust output drive into heavy or faulted loads |
Pinout & Package
LT1804IDD#PBF is housed in an 8-lead, 3 mm × 3 mm plastic DFN package with underside thermal pad internally connected to V–. The package supports high-power-density PCB layouts and enhanced thermal dissipation when the exposed pad is soldered to a ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT A | Amplifier A output | Delivers rail-to-rail sourced/sunk current; requires local decoupling near pin |
| 2 - –IN A | Inverting input of Amp A | High-impedance node; sensitive to layout-induced leakage and parasitic capacitance |
| 3 - +IN A | Non-inverting input of Amp A | Matches –IN A in offset and bias current; used for unity-gain buffer or differential sensing |
| 4 - V– | Negative supply / reference | Internally connects to DFN thermal pad; must be low-impedance path to system ground or negative rail |
| 5 - V+ | Positive supply | Accepts 2.3V–12.6V total supply; bypass with 0.1 µF ceramic capacitor close to pin |
| 6 - OUT B | Amplifier B output | Independent output; shares V+ and V– rails - crosstalk < –90 dB at 100 kHz |
| 7 - –IN B | Inverting input of Amp B | Matched to –IN A (≤2 mV offset difference); enables dual-channel matched gain stages |
| 8 - +IN B | Non-inverting input of Amp B | Provides second independent high-Z input; supports dual-sensor or dual-path signal conditioning |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 3.3V or 5V supply headroom - no level-shifting required for ADC interfacing |
| Low input offset voltage drift | 10–35 µV/°C - ensures stable DC accuracy over industrial temperature range without recalibration |
| High PSRR (90 dB) | Maintains signal integrity in noisy mixed-signal environments (e.g., motor control or switching power supply proximity) |
| Input bias current cancellation | <1 µA over 0.2V above V– to 1.75V below V+ - preserves accuracy with high-impedance sources (e.g., photodiode, pH probe) |
| Thermally enhanced DFN package | θJA = 160°C/W (standard), drops to ~50°C/W with proper thermal pad connection - enables higher continuous output current |
Applications
| ADC Driver | Video Line Driver |
|---|---|
Use Scenario: Driving the input of a 12-bit, 1 MSPS SAR ADC from a high-impedance sensor source. IC Role / Device Role / Timing Role: Buffer and level-shift analog signal while maintaining settling time <350 ns to 0.01%. Use Value: Rail-to-rail output swing and 100 V/µs slew rate ensure full-scale step response meets ADC aperture time requirements without droop or overshoot. |
Use Scenario: Transmitting composite NTSC video signals over 75 Ω coaxial cable. IC Role / Device Role / Timing Role: Unity-gain buffer with low differential gain (0.15%) and phase (1°) error. Use Value: 85 MHz GBW and –75 dBc HD at 1 MHz preserve color fidelity and minimize luminance delay in broadcast-grade lines. |
| Active Filter Stage | Rail-to-Rail Sensor Interface |
Use Scenario: Implementing a 2nd-order Sallen-Key low-pass filter at 5 MHz cutoff in a portable ultrasound front-end. IC Role / Device Role / Timing Role: Dual-amplifier topology providing gain, filtering, and output buffering in one package. Use Value: Matched amplifier characteristics (≤2 mV offset difference) ensure consistent channel-to-channel filter response and phase alignment. |
Use Scenario: Conditioning output from a 0–5 V rail-referenced thermistor bridge in a battery-powered environmental monitor. IC Role / Device Role / Timing Role: Single-supply non-inverting amplifier with VCM extending to ground and VOUT swinging to VCC. Use Value: Input common-mode range includes both rails and output swings within 20 mV of VCC, maximizing SNR without external bias networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4891-2ARZ | Lower slew rate (225 V/µs), lower GBW (105 MHz), higher supply current (6.5 mA), same DFN-8 package | Better suited for >10 MHz closed-loop designs but consumes >2× more quiescent power | Choose ADA4891-2ARZ only if >100 MHz small-signal bandwidth is required and power budget allows |
| OPA2350UA | Lower slew rate (36 V/µs), lower GBW (38 MHz), lower noise (7 nV/√Hz), SO-8 package only | Optimized for low-noise, low-power precision - not viable for >5 MHz signal paths | Select OPA2350UA when sub-10 MHz bandwidth and ultra-low noise dominate over speed and rail-to-rail output swing |
Compared with LT1804IDD#PBF, ADA4891-2ARZ trades higher speed for significantly increased supply current and reduced thermal margin in compact layouts, while OPA2350UA sacrifices bandwidth and rail-to-rail output capability for superior noise performance and lower power - making LT1804IDD#PBF the balanced choice for 10–40 MHz industrial signal chains requiring efficiency, speed, and full supply utilization.
Availability
LT1804IDD#PBF is available at Aetrix Electronics and suitable for ADC driver circuits, video line transmission, active filter implementations, and rail-to-rail sensor interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1804IDD#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 semiconductors.
The LT1804IDD#PBF belongs to the LT180x family of high-speed, rail-to-rail op amps designed specifically for low-voltage, high-fidelity signal acquisition and conditioning in industrial, medical, and communications equipment.
FAQ
What is the maximum operating junction temperature for LT1804IDD#PBF?
The LT1804IDD#PBF has a maximum junction temperature (TJMAX) of 125°C, as specified for the DD package variant. This is lower than the 150°C rating of SO-8 versions due to package construction and thermal path limitations. Designers must calculate actual TJ using ambient temperature, power dissipation, and θJA = 160°C/W - or reduce θJA to ~50°C/W by soldering the exposed thermal pad to a PCB ground plane. Exceeding 125°C risks parametric shift and long-term reliability degradation in LT1804IDD#PBF.
Does LT1804IDD#PBF support single-supply operation down to 2.3V?
Yes, LT1804IDD#PBF is fully specified for single-supply operation from 2.3V to 12.6V total supply voltage. At 2.3V, it maintains rail-to-rail input common-mode range (0V to 2.3V) and output swing within 90 mV of each rail at 5 mA load, with typical supply current of 3.1 mA per amplifier. Performance metrics including GBW (≥40 MHz) and slew rate (≥30 V/µs) remain functional across this range, making LT1804IDD#PBF suitable for ultra-low-voltage battery-powered instrumentation where supply headroom is constrained.
How does the dual-input-stage architecture affect LT1804IDD#PBF's input offset voltage?
The LT1804IDD#PBF uses a PNP/NPN dual-input stage that switches based on common-mode voltage: PNP active near VS–, NPN active near VS+. This causes a discontinuity in input offset voltage - typically ≤1 mV in the PNP region and ≤2 mV in the NPN region, with a transition zone exhibiting up to 1 mV shift. Data sheet Table "Input Offset Voltage" explicitly lists separate values for VCM = 0V (DD: 1.5–6.5 mV) and VCM = VS (DD: 1.7–9 mV). Designers must avoid operating LT1804IDD#PBF in the transition band for precision DC-coupled applications unless calibrated.
Can LT1804IDD#PBF drive a 150 Ω video load with acceptable NTSC performance?
Yes, LT1804IDD#PBF is characterized for NTSC video driving: differential gain is 0.15% and differential phase is 1° at AV = 2, RL = 150 Ω, VS = 5V. Its 85 MHz GBW and 100 V/µs slew rate ensure minimal group delay and edge ringing on composite sync pulses. For sustained 1 VP–P output into 150 Ω, LT1804IDD#PBF delivers >15 mA per amplifier with <100 mV saturation voltage - meeting broadcast line-driver requirements without external current boosting. This makes LT1804IDD#PBF a validated solution for SD video signal distribution.
Is LT1804IDD#PBF pin-compatible with other LT180x variants in DFN-8?
No - LT1804IDD#PBF is not pin-compatible with LT1803 or LT1805 in any package. Within the DFN-8 footprint, only LT1804 variants (e.g., LT1804CDD, LT1804IDD) share identical pinout: OUT A, –IN A, +IN A, V–, V+, OUT B, –IN B, +IN B. LT1803 is single-channel and LT1805 is quad-channel, so their DFN packages (if offered) would require different pin assignments. Substituting LT1804IDD#PBF for another LT180x part without verifying pin mapping will result in incorrect connections and potential damage. Always confirm pinout against the specific device's datasheet before layout reuse.
LT1804IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 100V/µs
- Gain Bandwidth Product:
- 83 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2.5 µA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 2.5mA (x2 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.3 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT1804IDD#PBF FAQ
1.How can I place an order for LT1804IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1804IDD#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 LT1804IDD#PBF reliable?
The price and inventory of LT1804IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1804IDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1804IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1804IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1804IDD#PBF?
LT1804IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1804IDD#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 LT1804IDD#PBF?
For technical support, including LT1804IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1804IDD#PBF requirements.
6.How does Aetrix verify that LT1804IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1804IDD#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 LT1804IDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1804IDD#PBF?
All LT1804IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1804IDD#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 LT1804IDD#PBF part is unused and in its original packaging.
Return procedure for LT1804IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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