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Analog Devices Inc. LT1469ACDF#PBF
- Part No.:
- LT1469ACDF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LT1469ACDF#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:185
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Product details
Overview
LT1469ACDF#PBF from Analog Devices (acquired Linear Technology) is a dual precision high-speed operational amplifier optimized for 16-bit data acquisition systems. It delivers 90 MHz gain bandwidth, 22 V/µs slew rate, and 900 ns settling to 150 µV for 10 V steps - enabling high-fidelity DAC current-to-voltage conversion and ADC buffering in ±5 V or ±15 V supplies.
For engineers reviewing the LT1469ACDF#PBF datasheet, LT1469ACDF#PBF pinout, LT1469ACDF#PBF application, or LT1469ACDF#PBF equivalent, key selection criteria include input offset voltage ≤125 µV (±15 V), 5 nV/√Hz input voltage noise, unity-gain stability, and DFN-12 package thermal performance with exposed pad tied to V–.
Technical Context
The LT1469ACDF#PBF employs a single-stage architecture with bias current cancellation at the inverting input, specifically tailored for inverting configurations like DAC I-to-V converters. Its input stage uses 100 Ω series resistors and back-to-back diodes for ESD protection and overvoltage clamping.
It achieves 16-bit DC accuracy via low drift (≤3 µV/°C max input offset voltage drift) and AC fidelity through high open-loop gain (>300 V/mV at ±15 V) and low distortion (–96.5 dB THD at 100 kHz, 10 VP-P). The device is specified across 0°C to 70°C and supports stable operation into 2 kΩ loads with ±12.8 V output swing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 90 MHz at ±15 V - ensures >60 dB open-loop gain at 100 kHz for low distortion in ADC buffer applications. |
| Slew Rate | 22 V/µs at ±15 V - enables full-scale 10 V step response within 450 ns, critical for active filter and instrumentation amplifier large-signal fidelity. |
| Input Offset Voltage | Max 125 µV at ±15 V - guarantees ≤0.002% error in 16-bit (±10 V) DAC I-to-V conversion at room temperature. |
| Settling Time | 900 ns to 150 µV (0.0023% of 10 V) - meets 16-bit settling requirement for high-speed data acquisition sampling. |
| Input Voltage Noise | 5 nV/√Hz at 10 kHz - dominates total noise for source impedances <1 kΩ, supporting low-noise photodiode and sensor front-end designs. |
| Supply Current | 5.2 mA per amplifier at ±15 V - balances speed and power for dual-channel precision signal conditioning in space-constrained layouts. |
| Output Swing | ±12.8 V into 2 kΩ at ±15 V - provides 2.4 V headroom, enabling rail-to-rail compatible interfacing with 12-bit+ SAR ADCs. |
Pinout & Package
LT1469ACDF#PBF is housed in a 12-lead (4 mm × 4 mm) plastic DFN package with exposed thermal pad (Pin 13) that must be connected to V– for thermal and electrical integrity. The package supports reflow soldering and offers θJA = 43°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply rail | Accepts +5 V or +15 V; bypass capacitor required near pin for stability. |
| OUT B | Amplifier B output | Drives load directly; requires external series resistor when driving >100 pF capacitive loads in unity gain. |
| –IN B | Inverting input B | Bias current trimmed at zero common-mode voltage; optimal for I-to-V feedback networks. |
| +IN B | Noninverting input B | Untrimmed bias current; avoid balanced source resistors to prevent DC error degradation. |
| N/C | No connect | Not internally bonded; leave floating or ground only if required by layout EMI mitigation. |
| N/C | No connect | Not internally bonded; no electrical function. |
| OUT A | Amplifier A output | Independent output channel; same drive capability and settling as OUT B. |
| –IN A | Inverting input A | Electrically identical to –IN B; supports dual independent inverting configurations. |
| +IN A | Noninverting input A | Same untrimmed characteristics as +IN B; use only in noninverting gain ≥2 for best DC accuracy. |
| V– | Negative supply rail | Accepts –5 V or –15 V; exposed pad (Pin 13) must be soldered to this net for thermal management. |
| N/C | No connect | Not internally bonded; no routing required. |
| N/C | No connect | Not internally bonded; no routing required. |
Key Features
| Feature | Design Value |
|---|---|
| 16-bit settling performance | 900 ns to 150 µV on 10 V step enables direct interface with 16-bit current-output DACs without additional settling compensation. |
| Optimized input noise profile | Total input noise minimized for 1 kΩ < RS < 20 kΩ - eliminates guesswork in transimpedance gain resistor selection for photodiode amps. |
| Inverting-input bias current trimming | Max 10 nA at ±15 V with ≤3 nA match between channels - reduces gain error and drift in precision I-to-V converter topologies. |
| Unity-gain stable operation | Stable with gain ≥1 without external compensation - simplifies design of ADC drivers and active filters without phase-margin tuning. |
| Wide supply range support | Specified from ±4.5 V to ±15 V - allows deployment in both low-voltage portable DAQ and industrial ±15 V signal chain architectures. |
Applications
| 16-Bit DAC Current-to-Voltage Converter | ADC Buffer for High-Accuracy Data Acquisition |
|---|---|
Use Scenario: Converting 16-bit current-output DAC (e.g., LTC1597) into bipolar ±10 V analog voltage with minimal settling error and THD. IC Role / Device Role / Timing Role: Dual op-amp configured as precision transimpedance amplifier and reference inverter; second amplifier buffers reference for bipolar swing. Use Value: Achieves 2.4 µs 16-bit settling (front-page typical application), 0.00025% THD+N at 1 kHz, and maintains 16-bit linearity across temperature via matched offset drift. | Use Scenario: Driving the input of a 16-bit SAR ADC (e.g., LTC2378) in a high-resolution data logger requiring DC accuracy and wideband noise rejection. IC Role / Device Role / Timing Role: Noninverting unity-gain buffer isolating ADC input from source impedance; provides low output impedance and fast settling before sample-and-hold. Use Value: Delivers ±12.8 V output swing into 2 kΩ, 5 nV/√Hz noise floor, and –96.5 dB THD at 100 kHz - preserving ENOB >15.5 bits up to 50 kHz input bandwidth. |
| Low-Distortion Active Filter | Photodiode Transimpedance Amplifier |
Use Scenario: Implementing a 4-pole 100 kHz low-pass filter in medical imaging front-end where harmonic distortion corrupts dynamic range. IC Role / Device Role / Timing Role: Dual amplifier used in cascaded Sallen-Key topology; first stage sets gain, second stage provides isolation and drive. Use Value: 22 V/µs slew rate prevents slew-induced distortion on 10 VP-P signals; –96.5 dB THD at 100 kHz ensures >100 dB SFDR in baseband filtering. | Use Scenario: Amplifying weak photocurrent (nA–µA) from a silicon PIN photodiode in optical spectroscopy, requiring ultra-low input current noise. IC Role / Device Role / Timing Role: Inverting transimpedance amplifier with feedback resistor optimized for 1–20 kΩ source impedance range. Use Value: 0.6 pA/√Hz input current noise and 5 nV/√Hz voltage noise minimize total referred input noise; bias current trimming reduces dark-current error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4898-2ARMZ | Higher slew rate (275 V/µs), lower noise (1.1 nV/√Hz), but higher input bias current (±200 nA) and no inverting-input trimming. | Better for wideband low-noise amplification; unsuitable for precision I-to-V where bias current matching matters. | Select ADA4898-2ARMZ only when bandwidth >200 MHz and voltage noise dominate requirements - not for 16-bit DAC interfaces. |
| OPA2189IDR | Zero-drift architecture, 0.005 µV/°C offset drift, but lower GBW (12 MHz) and slower settling (>3 µs to 16-bit). | Ideal for ultra-stable DC-coupled sensors; cannot meet 16-bit settling time or 90 MHz bandwidth needs of high-speed DAQ. | Choose OPA2189IDR for microvolt-level DC stability over temperature; avoid when AC performance or fast settling is required. |
Compared with ADA4898-2ARMZ and OPA2189IDR, the LT1469ACDF#PBF uniquely balances 16-bit settling time, inverting-input bias current trimming, and 90 MHz bandwidth - making it irreplaceable in dual-channel DAC I-to-V and ADC buffer roles where both precision and speed are simultaneously constrained.
Availability
LT1469ACDF#PBF is available at Aetrix Electronics and suitable for high-accuracy data acquisition systems, precision DAC interface modules, and medical instrumentation requiring stable component supply across extended production cycles.
Supply support for LT1469ACDF#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, formed through the acquisition of Linear Technology in 2017.
The LT1469ACDF#PBF belongs to ADI's legacy Linear Technology precision op-amp product line, engineered specifically for 16-bit data conversion signal chains where simultaneous DC accuracy, AC fidelity, and dual-channel integration are mandatory.
FAQ
What is the maximum operating temperature range for the LT1469ACDF#PBF?
The LT1469ACDF#PBF is rated for operation from 0°C to 70°C. This 'C' grade variant is fully specified and tested across that range; it is not guaranteed for –40°C to 85°C operation - for which the LT1469AIDF#PBF ('I' grade) should be selected. Thermal derating applies above 70°C.
How is the exposed thermal pad (Pin 13) of the LT1469ACDF#PBF connected in PCB layout?
The exposed pad (Pin 13) of the LT1469ACDF#PBF must be soldered directly to the V– net on the PCB. Per the datasheet, failure to connect it compromises thermal performance (θJA degrades from 43°C/W to >80°C/W) and may cause instability or increased offset drift. Use ≥4 thermal vias to an internal ground plane if V– is routed there.
Can the LT1469ACDF#PBF drive a 600 Ω load while maintaining 16-bit THD+N performance?
No - the LT1469ACDF#PBF is not characterized for 600 Ω loads. Its output swing and distortion specs are validated into ≥2 kΩ. Driving 600 Ω increases output current demand beyond its ±15 mA rating at ±12.5 V, causing clipping and THD degradation. For 600 Ω line drivers, use the LT1469 in parallel with a current booster (e.g., LT1364) as shown in TA02.
Does the LT1469ACDF#PBF require external compensation for unity-gain stability?
No - the LT1469ACDF#PBF is internally compensated and unity-gain stable. It drives capacitive loads up to 100 pF in unity-gain configuration without oscillation. For loads >100 pF, add a small series resistor (e.g., 10–50 Ω) at the output and/or a feedback capacitor (CF) as described in Figure 3 of the datasheet.
What is the input common-mode voltage range of the LT1469ACDF#PBF at ±5 V supplies?
At ±5 V supplies, the LT1469ACDF#PBF supports an input common-mode voltage range of –2.5 V to +3.6 V (positive rail) and –4.4 V to –2.5 V (negative rail), as guaranteed by CMRR. Inputs can be driven to the negative supply rail and within 0.5 V of the positive rail without phase reversal - beyond that, output inversion occurs.
LT1469ACDF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 22V/µs
- Gain Bandwidth Product:
- 90 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 3 nA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 4.1mA (x2 Channels)
- Current - Output / Channel:
- 22 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 9 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DFN (4x4)
LT1469ACDF#PBF FAQ
1.How can I place an order for LT1469ACDF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1469ACDF#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 LT1469ACDF#PBF reliable?
The price and inventory of LT1469ACDF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1469ACDF#PBF is usually 5 days.
3.What payment methods are accepted for LT1469ACDF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1469ACDF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1469ACDF#PBF?
LT1469ACDF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1469ACDF#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 LT1469ACDF#PBF?
For technical support, including LT1469ACDF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1469ACDF#PBF requirements.
6.How does Aetrix verify that LT1469ACDF#PBF is sourced from the original manufacturer or authorized distributors?
All LT1469ACDF#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 LT1469ACDF#PBF meets industry standards.
7.What is the process for return or replacement of LT1469ACDF#PBF?
All LT1469ACDF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1469ACDF#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 LT1469ACDF#PBF part is unused and in its original packaging.
Return procedure for LT1469ACDF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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