My Inquiry
My Account
Analog Devices Inc. LTC6400IUD-26#PBF
- Part No.:
- LTC6400IUD-26#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Special Purpose Amplifiers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC6400IUD-26#PBF.pdf
- Description:
- IC ADC DRIVER 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:363
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC6400IUD-26#PBF from Analog Devices (formerly Linear Technology) is a high-speed, fixed-gain differential ADC driver IC optimized for DC–300MHz signal conditioning in precision data acquisition systems. It delivers 26dB (20V/V) gain, –94dBc IMD3 at 70MHz, 1.5nV/√Hz input-referred noise, 1.9GHz –3dB bandwidth, and operates from 2.85V to 3.5V supply with 85mA quiescent current. It drives 12-/14-/16-bit ADCs such as the LTC2208 in IF sampling receivers.
For engineers reviewing the LTC6400IUD-26#PBF datasheet, LTC6400IUD-26#PBF pinout, LTC6400IUD-26#PBF application, or LTC6400IUD-26#PBF equivalent, key selection criteria include differential 50Ω input impedance, adjustable 1V–1.6V output common mode voltage via VOCM pin, filtered/unfiltered differential outputs (+OUTF/–OUTF and +OUT/–OUT), shutdown enable control, and QFN-16 package thermal performance.
Technical Context
The LTC6400IUD-26#PBF implements a fully differential op amp architecture with on-chip 25Ω/500Ω feedback resistors setting fixed 20V/V gain and 50Ω differential input impedance. Its internal common-mode feedback loop achieves 400MHz –3dB bandwidth for fast rejection of output disturbances.
It features dual output paths: unfiltered outputs (+OUT/–OUT) with 12.5Ω series resistance and filtered outputs (+OUTF/–OUTF) with 50Ω series resistance and 2.7pF shunt capacitance, enabling direct 50Ω single-ended matching or external LC filtering without baluns. The VOCM pin provides high-impedance, 15MHz-bandwidth control of output common-mode voltage from 1V to 1.6V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 26dB (20V/V) - fixed, eliminates external gain-setting components and ensures stable broadband response |
| –3dB Bandwidth | 1.9GHz - supports wideband IF sampling up to 300MHz fundamental with margin |
| OIP3 @ 70MHz | 51dBm - enables high dynamic range in receiver front-ends with low intermodulation distortion |
| Input Noise Density | 1.5nV/√Hz - minimizes added noise when driving high-resolution ADCs like LTC2208 |
| Supply Voltage | 2.85V to 3.5V - compatible with standard 3.3V rail and allows headroom for low-noise LDOs |
| Output Swing | 4.7VP-P differential - sufficient for full-scale drive of 16-bit ADCs with >90dB SNR |
| Operating Temp | –40°C to 85°C - qualified for industrial and base station environments |
Pinout & Package
Package: 16-lead 3mm × 3mm × 0.75mm plastic QFN (UD package) with exposed V– pad (Pin 17) requiring PCB soldering for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ (Pins 1, 3, 10) | Positive supply input | Three parallel pins reduce power delivery inductance; each requires local 1000pF + 0.1μF bypassing |
| VOCM (Pin 2) | Output common-mode voltage control | High-impedance input sets differential output DC level from 1V to 1.6V; 0.1μF bypass required |
| V– (Pins 4, 9, 12, 17) | Negative supply / ground reference | Four connection points plus exposed pad ensure low-impedance return path and thermal dissipation |
| +IN / –IN (Pins 13–16) | Differential analog inputs | Pairs internally shorted (13+14, 15+16); support DC- or AC-coupled operation with 50Ω differential input impedance |
| +OUT / –OUT (Pins 5, 8) | Unfiltered differential outputs | 12.5Ω series resistance enables external RC filtering and improves stability into varied loads |
| +OUTF / –OUTF (Pins 6, 7) | Filtered differential outputs | 50Ω series + 2.7pF shunt provide 590MHz internal LPF; simplifies 50Ω single-ended interface |
| ENABLE (Pin 11) | Shutdown control | Active-low logic input; pulls supply current from 85mA to <3mA while disabling output stage |
Key Features
| Feature | Design Value |
|---|---|
| Differential 50Ω input impedance | Enables direct interface to 50Ω RF sources or SAW filters without external matching networks |
| Adjustable 1V–1.6V output common mode | Allows direct connection to ADC VCM pins (e.g., LTC2208) eliminating transformers and AC-coupling capacitors |
| Two output configurations | Unfiltered (+OUT/–OUT) and filtered (+OUTF/–OUTF) outputs support flexible signal chain design including bandpass filtering |
| 1.9GHz –3dB bandwidth | Provides flat gain and phase response across DC–300MHz IF bands with >10dB gain margin |
| Low 1.5nV/√Hz input noise | Preserves SNR when driving 16-bit ADCs; contributes <0.2 LSB noise at 130Msps sampling |
Applications
| IF Sampling Receiver | SAW Filter Interfacing |
|---|---|
Use Scenario: Processing 70MHz or 140MHz IF signals from mixer outputs before digitization in communications base stations. IC Role / Device Role / Timing Role: Differential ADC driver providing fixed 26dB gain, low IMD3 (–94dBc @ 70MHz), and 50Ω input match to minimize reflections. Use Value: Enables direct drive of 16-bit ADCs like LTC2208 without baluns, reducing BOM count and board area by >30% versus transformer-based solutions. | Use Scenario: Amplifying narrowband signals from surface acoustic wave (SAW) filters in GPS or LTE front-ends where group delay flatness is critical. IC Role / Device Role / Timing Role: High-linearity gain block with 1.9GHz bandwidth ensuring minimal passband ripple and phase distortion across filter skirts. Use Value: Maintains SAW filter shape integrity with <0.2dB gain flatness up to 530MHz, preserving adjacent channel rejection performance. |
| Single-Ended to Differential Conversion | Optical Photodiode Receiver |
Use Scenario: Converting single-ended intermediate frequency signals (e.g., from LNA outputs) to differential format for high-SNR ADC sampling. IC Role / Device Role / Timing Role: Fully differential amplifier configured with asymmetric input termination (e.g., 50Ω source + 150Ω RT) to synthesize balanced outputs. Use Value: Achieves >50dB CMRR without external components, suppressing common-mode noise from shared supply rails in dense RF modules. | Use Scenario: Amplifying low-level current pulses from high-speed photodiodes (e.g., JDSU ETX-100RFC2) in optical time-domain reflectometry systems. IC Role / Device Role / Timing Role: Low-noise transimpedance-capable driver with 1.5nV/√Hz input noise and 2ns 1% settling time for sub-nanosecond pulse fidelity. Use Value: Supports >1Gbps optical link sampling with <1.5ps timing jitter contribution, enabling precise fault location in fiber networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential ADC driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC6401IUD-26#PBF | Pin-compatible, same 26dB gain and noise, but lower 45mA supply current and reduced linearity above 140MHz (OIP3 = 42dBm @ 240MHz vs. 48dBm) | Better suited for battery-powered or thermally constrained designs where ultra-wideband linearity is not required | Select LTC6401IUD-26#PBF when power budget is <50mW and IF bandwidth stays below 140MHz |
| LT1993-2IMS8#PBF | 800MHz –3dB bandwidth, 2V/V gain, 38dBm OIP3 @ 10MHz, SO-8 package, no VOCM pin or filtered outputs | Targeted at lower-frequency, lower-gain applications; lacks common-mode control and QFN thermal performance | Choose LT1993-2IMS8#PBF only for cost-sensitive, <200MHz applications where board space and thermal management are less critical |
Compared with LTC6401IUD-26#PBF and LT1993-2IMS8#PBF, the LTC6400IUD-26#PBF delivers superior wideband linearity (OIP3 ≥48dBm to 240MHz) and integrated VOCM control-critical for direct-coupled, high-resolution ADC interfaces-while its QFN-16 package supports higher power dissipation in compact layouts.
Availability
LTC6400IUD-26#PBF is available at Aetrix Electronics and suitable for IF sampling receivers, SAW filter interfacing, single-ended-to-differential conversion, and optical photodiode receiver designs requiring stable component supply across industrial temperature ranges.
Supply support for LTC6400IUD-26#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 for precision instrumentation, communications, and industrial applications.
The LTC6400 family was designed specifically as low-noise, low-distortion differential ADC drivers for DC–300MHz IF signal chains in wireless infrastructure, test equipment, and high-speed data acquisition systems.
FAQ
What is the operating temperature range for the LTC6400IUD-26#PBF?
The LTC6400IUD-26#PBF is specified and guaranteed over the industrial temperature range of –40°C to +85°C. This rating applies to all DC and AC electrical characteristics in the datasheet, making it suitable for base station, industrial automation, and outdoor equipment deployments where ambient temperatures vary widely.
Does the LTC6400IUD-26#PBF require external output termination resistors when driving an ADC?
No, the LTC6400IUD-26#PBF does not require external output termination resistors. Its low 25Ω differential output impedance allows direct connection to ADC inputs. When using the unfiltered outputs (+OUT/–OUT), the internal 12.5Ω series resistors provide inherent isolation; the filtered outputs (+OUTF/–OUTF) integrate 50Ω series resistors and 2.7pF shunt capacitance for 50Ω matching.
How is the output common-mode voltage set on the LTC6400IUD-26#PBF?
The output common-mode voltage of the LTC6400IUD-26#PBF is set by applying a DC voltage (1V to 1.6V) to the VOCM pin (Pin 2). This high-impedance input controls the differential output midpoint precisely, enabling direct interface to ADC VCM pins-such as the LTC2208's 1.25V VCM-without external level-shifting circuitry.
Can the LTC6400IUD-26#PBF accept single-ended input signals?
Yes, the LTC6400IUD-26#PBF supports single-ended inputs via asymmetric termination: one input is driven through a matching network while the other is terminated to the same network and a source resistor. This configuration maintains symmetrical output swing and achieves usable distortion performance-though differential input yields optimal IMD3 (e.g., –94dBc vs. –87dBc at 70MHz).
What is the purpose of the ENABLE pin on the LTC6400IUD-26#PBF?
ENABLE (Pin 11) is an active-low shutdown control. When pulled low (<0.8V), the LTC6400IUD-26#PBF operates normally with 85mA supply current. When pulled high (>2.4V), it enters shutdown mode, reducing supply current to <3mA while placing the outputs in high-impedance state-enabling power gating in multi-channel systems without affecting signal chain integrity.
LTC6400IUD-26#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Last Time Buy
- Type:
- ADC Driver
- Applications:
- Data Acquisition
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 16-QFN (3x3)
LTC6400IUD-26#PBF FAQ
1.How can I place an order for LTC6400IUD-26#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6400IUD-26#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 LTC6400IUD-26#PBF reliable?
The price and inventory of LTC6400IUD-26#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6400IUD-26#PBF is usually 5 days.
3.What payment methods are accepted for LTC6400IUD-26#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6400IUD-26#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6400IUD-26#PBF?
LTC6400IUD-26#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6400IUD-26#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 LTC6400IUD-26#PBF?
For technical support, including LTC6400IUD-26#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6400IUD-26#PBF requirements.
6.How does Aetrix verify that LTC6400IUD-26#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6400IUD-26#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 LTC6400IUD-26#PBF meets industry standards.
7.What is the process for return or replacement of LTC6400IUD-26#PBF?
All LTC6400IUD-26#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6400IUD-26#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 LTC6400IUD-26#PBF part is unused and in its original packaging.
Return procedure for LTC6400IUD-26#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC6400IUD-26#PBF Tags
-
TSM103WIDT
STMicroelectronics
-
LM392M/NOPB
Texas Instruments
-
MCP6S93T-E/UN
Microchip Technology
-
INA137UA/2K5
Texas Instruments
-
INA134UA/2K5
Texas Instruments
-
TS34118CS28 RDG
Taiwan Semiconductor Corporation
-
SI8920BC-IPR
Skyworks Solutions Inc.
-
ADUM3190ARQZ-RL7
Analog Devices Inc.
-
ADUM3190ARQZ
Analog Devices Inc.
-
AMC1311BDWVR
Texas Instruments
-
AMC1350DWVR
Texas Instruments
-
ADUM3190SRQZ-RL7
Analog Devices Inc.
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…
