My Inquiry
My Account
Analog Devices Inc. LT6221CDD#PBF
- Part No.:
- LT6221CDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT6221CDD#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:446
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT6221CDD#PBF from Analog Devices (formerly Linear Technology) is a dual, rail-to-rail input and output precision operational amplifier in an 8-lead 3mm × 3mm DFN package. It delivers 60MHz gain-bandwidth product, 20V/µs slew rate, 1mA max supply current per amplifier, <350µV input offset voltage, and rail-to-rail output swing within 10mV of either supply rail - enabling high-fidelity signal conditioning in low-voltage, space-constrained data acquisition systems.
For engineers reviewing the LT6221CDD#PBF datasheet, LT6221CDD#PBF pinout, LT6221CDD#PBF application, or LT6221CDD#PBF equivalent, key selection criteria include its guaranteed 0°C to 70°C operation, dual-channel matching performance (e.g., <150µV input offset match), low 10nV/√Hz input voltage noise, and compatibility with single-supply (2.2V–12.6V) and split-supply (±2.5V to ±5V) configurations.
Technical Context
The LT6221CDD#PBF employs a composite PNP/NPN input stage that automatically transitions between transistor pairs across the full input common-mode range (from VS– to VS+), eliminating phase reversal and ensuring stable operation when inputs exceed rails. Its output stage uses complementary Class AB architecture to sustain 50mA typical output current while maintaining rail-to-rail swing under load.
Internally compensated for unity-gain stability, the device achieves 60MHz GBW with 102dB typical CMRR and 105dB PSRR - critical for driving SAR ADCs and active filters where DC accuracy and AC rejection must coexist. The DFN package's exposed pad (internally connected to VS–) supports thermal management at TJMAX = 125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 60MHz - enables stable closed-loop operation up to ~5MHz at AV = 12, suitable for anti-aliasing and reconstruction filters. |
| Slew Rate | 20V/µs - supports full-scale 4Vpp output at 1.25MHz without slewing distortion in video or fast-settling applications. |
| Input Offset Voltage | 350µV max - ensures ≤0.007% gain error in 5V full-scale instrumentation amplifiers. |
| Supply Current per Amp | 1mA max - allows dual-channel operation at <2.1mW from 5V, ideal for battery-powered sensor front-ends. |
| Input Voltage Noise | 10nV/√Hz @ 10kHz - contributes <1.4µVrms integrated noise in 100kHz bandwidth, preserving SNR in precision measurement. |
| Output Swing | Within 10mV of rails @ no load - maximizes dynamic range in 3.3V systems, delivering >3.28Vpp output swing. |
| Common-Mode Rejection | 102dB typ - rejects >100,000:1 of power supply or ground noise coupling into differential signals. |
Pinout & Package
LT6221CDD#PBF is housed in an 8-lead (3mm × 3mm) plastic DFN package with exposed pad internally connected to VS–. PCB layout requires thermal connection of the exposed pad to a VS– plane for optimal junction temperature control (θJA = 160°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT A | Amplifier A output | Capable of sourcing/sinking ≥20mA while maintaining rail-to-rail swing; requires local 0.1µF bypass to VS–. |
| 2: –IN A | Inverting input A | High-impedance node (2pF input capacitance); sensitive to layout-induced parasitic capacitance affecting stability. |
| 3: +IN A | Non-inverting input A | Matches –IN A in bias current (<150nA max); use symmetric trace routing to minimize offset drift. |
| 4: VS– | Negative supply / ground reference | Internal connection point for exposed pad; must be low-inductance path to system ground or negative rail. |
| 5: VS+ | Positive supply | Accepts 2.2V–12.6V single supply or positive rail of split supply; bypass with 1µF ceramic + 0.1µF ceramic. |
| 6: OUT B | Amplifier B output | Electrically identical to OUT A; independent channel enables dual-path signal processing without crosstalk. |
| 7: –IN B | Inverting input B | Channel-to-channel input offset match ≤150µV ensures matched gain/phase response in differential configurations. |
| 8: +IN B | Non-inverting input B | Same input structure as +IN A; PNP/NPN auto-switching preserves rail-to-rail operation across full common-mode range. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Operates with VCM = VS– to VS+ and VOUT = VS– +10mV to VS+ –10mV, enabling true single-supply 3.3V data acquisition. |
| Low input bias current | <150nA max ensures <1.5mV error across 10MΩ source impedance - critical for high-Z sensor interfaces. |
| High DC precision | 350µV max VOS and 100V/mV open-loop gain support 16-bit+ resolution in closed-loop configurations. |
| Wide supply range | 2.2V–12.6V operation allows direct interface with Li-ion (3.0–4.2V), USB (5V), and industrial (±5V) supplies without regulation. |
| Robust input protection | Back-to-back diodes clamp differential input voltage to ±1.4V; safe for overvoltage events up to ±10mA input current. |
Applications
| Instrumentation Signal Conditioning | High-Speed Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying low-level thermocouple or bridge sensor outputs in portable test equipment with 3.3V supply. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail output driving 16-bit SAR ADC reference buffer. Use Value: 350µV max VOS and 102dB CMRR eliminate calibration drift and reject shared ground noise, enabling <0.01% system accuracy. | Use Scenario: Driving the input of a 1MSPS 12-bit ADC in medical ultrasound beamforming modules. IC Role / Device Role / Timing Role: Single-supply buffer with 20V/µs slew rate and 60MHz GBW to preserve pulse fidelity up to 500kHz. Use Value: Full-power bandwidth of 1.6MHz at 4Vpp ensures <0.01% settling in <300ns, meeting ADC aperture jitter requirements. |
| Rail-to-Rail Video Line Driver | Active Filter for Communications Baseband |
Use Scenario: Driving 75Ω coaxial video lines (CVBS, Y/C) from embedded vision SoCs operating at 3.3V. IC Role / Device Role / Timing Role: Unity-gain buffer with 50mA output drive capability and 0.3% differential gain/phase error. Use Value: 10nV/√Hz noise and –77.5dBc harmonic distortion maintain >65dB SNR across NTSC/PAL bandwidths. | Use Scenario: Implementing 2nd-order low-pass filtering in LTE/LPWAN baseband receivers before ADC sampling. IC Role / Device Role / Timing Role: Dual-channel Sallen-Key topology using one amp for gain and one for buffering. Use Value: Matched channel parameters (≤150µV VOS delta) ensure consistent filter Q-factor and cutoff frequency across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8620ARMZ | Higher 12MHz GBW, lower 1.5nV/√Hz noise, but only 2.5V–12V supply range and no rail-to-rail output. | Better for ultra-low-noise audio preamps; unsuitable for 3.3V rail-to-rail output stages. | Select AD8620ARMZ only when sub-2nV/√Hz noise dominates over output swing requirements. |
| OPA2350UA | Similar 38MHz GBW and rail-to-rail I/O, but higher 5.5mA supply current and 6mV max VOS at 85°C. | Acceptable for cost-sensitive industrial sensors where 1mA quiescent current is not critical. | Choose OPA2350UA if budget constraints outweigh low-power and precision needs in non-battery applications. |
Compared with AD8620ARMZ and OPA2350UA, the LT6221CDD#PBF uniquely balances 60MHz bandwidth, 1mA supply current, rail-to-rail output, and 350µV VOS - making it optimal for portable, high-speed, precision analog front-ends where power, accuracy, and voltage headroom are simultaneously constrained.
Availability
LT6221CDD#PBF is available at Aetrix Electronics and suitable for instrumentation signal conditioning, high-speed data acquisition front-ends, rail-to-rail video line drivers, and active filters requiring stable component supply across industrial, medical, and test & measurement programs.
Supply support for LT6221CDD#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT6221CDD#PBF belongs to ADI's legacy Linear Technology precision op amp portfolio, designed specifically for applications demanding wide bandwidth, rail-to-rail operation, low power, and high DC accuracy in compact packages.
FAQ
What is the operating temperature range specified for the LT6221CDD#PBF?
The LT6221CDD#PBF is characterized and guaranteed over 0°C to 70°C ambient temperature. While functional from –40°C to 85°C, only the 0°C to 70°C range is fully tested and specified per datasheet limits - including input offset voltage (≤350µV), supply current (≤1mA), and gain-bandwidth (≥60MHz). For extended temperature designs, consult the LT6221IDD#PBF variant.
Does the LT6221CDD#PBF support single-supply operation?
Yes, the LT6221CDD#PBF supports true single-supply operation from 2.2V to 12.6V. Its rail-to-rail input stage accepts common-mode voltages from VS– to VS+, and its rail-to-rail output swings within 10mV of both rails - enabling direct interfacing with 3.3V or 5V microcontrollers and ADCs without level-shifting circuitry.
How does the LT6221CDD#PBF achieve rail-to-rail input capability?
The LT6221CDD#PBF uses a composite input stage with parallel PNP and NPN differential pairs. A steering circuit (Q5/Q6/Q7) automatically activates the NPN pair as the input approaches VS+, and the PNP pair near VS–, ensuring continuous conduction and no phase reversal across the full 0V to VS+ common-mode range - a key differentiator from conventional single-pair op amps.
What is the recommended PCB layout practice for the exposed pad on the LT6221CDD#PBF DFN package?
The exposed pad of the LT6221CDD#PBF is internally connected to VS–. For optimal thermal performance (θJA = 160°C/W), it must be soldered to a dedicated VS– copper pour with ≥4 thermal vias (0.3mm diameter) connecting to an internal or bottom-layer ground plane. Avoid floating or unconnected pads, which degrade thermal resistance by >40%.
Can the LT6221CDD#PBF drive heavy capacitive loads directly?
The LT6221CDD#PBF is not unity-gain stable into large capacitive loads. Driving >100pF directly causes peaking and potential oscillation. For capacitive loads >50pF, use a series isolation resistor (ROS = 10Ω–50Ω) between the output and load, as validated in Figure 32 of the datasheet - this maintains stability while preserving bandwidth and settling time.
LT6221CDD#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:
- 20V/µs
- Gain Bandwidth Product:
- 60 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 250 nA
- Voltage - Input Offset:
- 700 µV
- Current - Supply:
- 900µA (x2 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT6221CDD#PBF FAQ
1.How can I place an order for LT6221CDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6221CDD#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 LT6221CDD#PBF reliable?
The price and inventory of LT6221CDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6221CDD#PBF is usually 5 days.
3.What payment methods are accepted for LT6221CDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6221CDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6221CDD#PBF?
LT6221CDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6221CDD#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 LT6221CDD#PBF?
For technical support, including LT6221CDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6221CDD#PBF requirements.
6.How does Aetrix verify that LT6221CDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT6221CDD#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 LT6221CDD#PBF meets industry standards.
7.What is the process for return or replacement of LT6221CDD#PBF?
All LT6221CDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6221CDD#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 LT6221CDD#PBF part is unused and in its original packaging.
Return procedure for LT6221CDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT6221CDD#PBF Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
