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Analog Devices Inc. LT6604IUFF-5#PBF
- Part No.:
- LT6604IUFF-5#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 34-WFQFN Exposed Pad
- Datasheet:
-
LT6604IUFF-5#PBF.pdf
- Description:
- IC OPAMP DIFF 2 CIRCUIT 34QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,521
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Product details
Overview
LT6604IUFF-5#PBF from Analog Devices (formerly Linear Technology) is a dual, fully differential amplifier with integrated 4th-order 5MHz lowpass filters, designed as a high-performance ADC driver and antialiasing filter. It delivers >82dB SNR at 3V supply, 2VP-P output, ±0.05dB gain matching, <0.5° phase matching, and supports resistor-programmable differential gain (e.g., 1× to 4×). It is used in high-speed data acquisition systems interfacing directly to precision ADCs like LTC22xx series.
For engineers reviewing the LT6604IUFF-5#PBF datasheet, LT6604IUFF-5#PBF pinout, LT6604IUFF-5#PBF application, or LT6604IUFF-5#PBF equivalent, key selection criteria include its guaranteed channel-to-channel gain/phase matching over –40°C to 85°C, input-referred noise of 45μVRMS (10kHz–5MHz), differential output swing of 3.85VP-P on 3V supply, and support for 3V/5V/±5V operation with adjustable VOCM.
Technical Context
The LT6604IUFF-5#PBF integrates two independent signal paths, each comprising a fully differential op-amp stage followed by a 4th-order lowpass filter approximating a Chebyshev response. Each channel features matched internal feedback resistors (806Ω) and supports external RIN to set DC gain as 806Ω/RIN, enabling precise gain programming from 1× to >4×.
It implements dual independent common-mode control: VMID sets the output common mode of the first amplifier stage, while VOCM programs the final differential output common mode voltage. Both are high-impedance inputs, allowing flexible level-shifting for direct interface to ADCs with varying reference requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Filter Cutoff Frequency | 5MHz - Fixed 4th-order lowpass response optimized for antialiasing before 10+ MSPS ADCs. |
| Signal-to-Noise Ratio | 82dB (TYP, 3V, 2VP-P) - Enables high-resolution digitization of low-amplitude signals without external amplification. |
| Channel Gain Matching | ±0.05dB (DC–260kHz) - Ensures consistent amplitude response across dual channels for I/Q or stereo processing. |
| Channel Phase Matching | ±0.2° (2.5MHz) - Preserves time alignment between channels critical for coherent sampling and beamforming. |
| Differential Output Swing | 3.85VP-P (3V supply) - Fully utilizes dynamic range of 3V-supply ADCs without rail clipping. |
| Input-Referred Noise | 45μVRMS (10kHz–5MHz) - Low noise floor supports high-SNR signal chains in medical imaging and test equipment. |
| Harmonic Distortion | HD2 = –93dBc, HD3 = –96dBc (1MHz, 2VP-P, 800Ω load) - Minimizes spurious content in wideband RF and instrumentation applications. |
Pinout & Package
LT6604IUFF-5#PBF is housed in a 34-lead (4mm × 7mm) plastic QFN package with exposed thermal pad (Pin 35 = V–). The package supports high-density PCB layouts and efficient heat dissipation via soldered exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| +INA, –INA (Pins 2, 4) | Channel A Differential Input | Accepts balanced or single-ended input via matched external RIN; defines gain as 806Ω/RIN. |
| VOCMA (Pin 6) | Channel A Output Common-Mode Reference | High-Z input setting final differential output common-mode voltage; must be bypassed with 0.01μF unless tied to ground plane. |
| V– (Pins 7, 24, 31, 32, 35) | Negative Supply / Ground Reference | Shared negative rail for both channels; exposed pad (Pin 35) must be soldered to PCB for thermal and electrical integrity. |
| VMIDA (Pin 34) | Channel A Mid-Supply Bias Reference | Internally biased ~VS/2; sets common-mode of first amplifier stage; bypass to V– with 0.01μF ceramic capacitor. |
| +INB, –INB (Pins 10, 12) | Channel B Differential Input | Functionally identical to +INA/–INA; independent gain programming per channel. |
| VOCMB (Pin 14) | Channel B Output Common-Mode Reference | Independent VOCM control for Channel B; can be tied to VMIDB or driven externally. |
| +OUTA, –OUTA (Pins 27, 29) | Channel A Differential Output | Delivers filtered, level-shifted differential signal; capable of driving ≥800Ω loads with <–93dBc distortion. |
| +OUTB, –OUTB (Pins 19, 21) | Channel B Differential Output | Electrically isolated from Channel A except for shared V–; enables true dual-path signal conditioning. |
Key Features
| Feature | Design Value |
|---|---|
| Dual matched 4th-order 5MHz filters | Eliminates need for external passive LC filters and discrete op-amp stages, reducing board area and component count by >50% in antialiasing designs. |
| Guaranteed gain/phase matching (–40°C to 85°C) | Enables production-ready I/Q demodulator and TDD/FDD transceiver designs without per-unit calibration. |
| Adjustable output common-mode voltage (VOCM) | Allows direct interface to ADCs with diverse reference architectures (e.g., 1.25V, 2.0V, or mid-supply references) without level-shifter ICs. |
| Resistor-programmable differential gain | Supports scalable gain from 1× to 4× using standard 1% thin-film resistors-no trimming or digital control required. |
| Low distortion at high frequency (–66dBc HD2 @ 5MHz) | Maintains spectral purity in wireless infrastructure baseband processing where adjacent-channel leakage ratio (ACLR) is critical. |
Applications
| Wireless Baseband Processing | Medical Ultrasound Beamforming |
|---|---|
Use Scenario: Conditioning I/Q signals from quadrature modulators prior to 12-bit, 100MSPS ADCs in LTE/FDD transceivers. IC Role / Device Role / Timing Role: Dual-channel antialiasing filter and differential driver with matched group delay and gain. Use Value: Achieves –73dBc 3rd harmonic at 5MHz while maintaining <0.5° inter-channel phase skew, meeting ACLR mask requirements without DSP correction. |
Use Scenario: Amplifying and filtering echo return signals from 128-element phased-array transducers in portable ultrasound systems. IC Role / Device Role / Timing Role: Dual-path analog front-end with programmable gain and precise common-mode translation for ADC input staging. Use Value: Delivers 82dB SNR at 3V supply, enabling >14-bit ENOB performance in battery-powered systems with strict power budgets. |
| High-Speed Test Equipment | Industrial Data Acquisition |
Use Scenario: Driving dual 16-bit, 250MSPS ADCs in modular oscilloscope digitizers requiring sub-picosecond timing alignment. IC Role / Device Role / Timing Role: Matched dual-channel signal conditioner with <0.2° phase matching at 2.5MHz and <0.05dB gain matching. Use Value: Reduces inter-channel skew-induced measurement error to <1ps, supporting accurate time-domain reflectometry and jitter analysis. |
Use Scenario: Antialiasing and level-shifting sensor outputs (e.g., strain gauges, RTDs) before multiplexed sigma-delta ADCs in PLC analog input modules. IC Role / Device Role / Timing Role: Precision differential driver with programmable gain and VOCM adjustment for flexible sensor interface configurations. Use Value: Supports 24-bit resolution by contributing only 45μVRMS integrated noise and eliminating need for discrete gain-staging op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual differential amplifier and filter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT6604CUFF-5#PBF | Same silicon, rated for 0°C to 70°C operating range; not tested over –40°C to 85°C. | Suitable for commercial-grade instrumentation but not automotive or industrial environments with extended temperature cycling. | Select LT6604IUFF-5#PBF when full –40°C to 85°C guaranteed performance is required for reliability-critical deployments. |
| ADA4940-2ARZ | No integrated filter; requires external RC or active filter; higher input bias current (±5.5μA vs ±30μA); lower SNR (76dB vs 82dB). | Better suited for variable-bandwidth or adaptive filtering where fixed 5MHz cutoff is insufficient. | Choose ADA4940-2ARZ only if design requires tunable bandwidth or operates beyond 5MHz passband; otherwise LT6604IUFF-5#PBF reduces BOM count and layout complexity. |
Compared with LT6604CUFF-5#PBF, the LT6604IUFF-5#PBF provides guaranteed performance across industrial temperature extremes, while versus ADA4940-2ARZ it eliminates external filter components and delivers 6dB higher SNR-reducing system-level noise floor and simplifying layout validation.
Availability
LT6604IUFF-5#PBF is available at Aetrix Electronics and suitable for high-speed test equipment, medical imaging subsystems, and wireless infrastructure baseband designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT6604IUFF-5#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, serving industrial, communications, automotive, and healthcare markets.
The LT6604IUFF-5#PBF belongs to ADI's high-speed signal conditioning portfolio, engineered specifically for precision data acquisition systems requiring integrated filtering, matched dual-channel performance, and robust operation from –40°C to 85°C.
FAQ
What is the operating temperature range guaranteed for LT6604IUFF-5#PBF?
The LT6604IUFF-5#PBF is fully specified and tested over –40°C to +85°C, with all electrical characteristics-including gain matching, phase matching, and distortion-guaranteed across this industrial temperature range. This distinguishes it from the LT6604CUFF-5#PBF, which is only characterized over 0°C to 70°C.
Can LT6604IUFF-5#PBF operate from a single 3.3V supply?
Yes, LT6604IUFF-5#PBF is fully specified for 3V operation and performs optimally at 3.3V. It delivers 3.85VP-P differential output swing, >82dB SNR, and –93dBc 2nd harmonic distortion under 3.3V supply conditions with proper bypassing (0.1μF ceramic on V+A/V+B to V–).
How is differential gain programmed on LT6604IUFF-5#PBF?
Differential gain on LT6604IUFF-5#PBF is set by external resistors RIN connected to +IN/–IN pins: Gain = 806Ω / RIN. For example, 200Ω yields ~4× gain; 402Ω yields ~2×; 806Ω yields unity gain. RIN must be matched to ≤0.1% for optimal channel matching.
What is the function of VMID and VOCM pins on LT6604IUFF-5#PBF?
VMID (e.g., Pin 8 for Channel B) sets the common-mode voltage of the first amplifier stage and is internally biased near VS/2. VOCM (e.g., Pin 14 for Channel B) sets the final differential output common-mode voltage. VOCM can be tied to VMID for simplicity or driven independently to level-shift output for specific ADC references.
Does LT6604IUFF-5#PBF require external compensation or stability components?
No, LT6604IUFF-5#PBF is internally compensated and stable with capacitive loads up to 50pF per output. Stability is ensured across all gain settings and supply voltages (3V/5V/±5V) when standard 0.01μF bypassing is applied to VMID/VOCM and 0.1μF to V+/V– pins.
LT6604IUFF-5#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 34-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Differential
- Applications:
- Driver
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 34-QFN (4x7)
LT6604IUFF-5#PBF FAQ
1.How can I place an order for LT6604IUFF-5#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT6604IUFF-5#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 LT6604IUFF-5#PBF reliable?
The price and inventory of LT6604IUFF-5#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT6604IUFF-5#PBF is usually 5 days.
3.What payment methods are accepted for LT6604IUFF-5#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT6604IUFF-5#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT6604IUFF-5#PBF?
LT6604IUFF-5#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT6604IUFF-5#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 LT6604IUFF-5#PBF?
For technical support, including LT6604IUFF-5#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT6604IUFF-5#PBF requirements.
6.How does Aetrix verify that LT6604IUFF-5#PBF is sourced from the original manufacturer or authorized distributors?
All LT6604IUFF-5#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 LT6604IUFF-5#PBF meets industry standards.
7.What is the process for return or replacement of LT6604IUFF-5#PBF?
All LT6604IUFF-5#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT6604IUFF-5#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 LT6604IUFF-5#PBF part is unused and in its original packaging.
Return procedure for LT6604IUFF-5#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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