LT6350IDD#PBF - Low Noise SE-to-Diff ADC Driver | ADI
MPN: LT6350IDD#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.45 | $64.50 |
| 100 | $5.7 | $570.00 |
| 500 | $5.1 | $2,550.00 |
| 1,000 | $4.55 | $4,550.00 |
LT6350IDD#PBF Overview
An ADC driver (also called a differential amplifier or SE-to-diff converter) is a specialized analog interface stage placed between a single-ended signal source and a differential-input ADC. Its job is to level-shift, gain-set, and convert the signal while preserving SNR and adding minimal noise and distortion. The LT6350 sits in the signal chain hierarchy of transducer -> front-end amplifier -> ADC driver -> SAR/Delta-Sigma ADC, where it is responsible for common-mode level shifting and differential gain setting.
Key features include rail-to-rail input and output swing, very low input-referred voltage noise, fast settling for multi-MHz ADC sampling, integrated precision resistors, and a shutdown/ground-reference pin for power saving. The exposed-pad DFN package provides a low thermal-resistance path (~43 C/W typical) suitable for continuous operation at moderate quiescent current, and the differential output maintains balance across the ADC input common-mode range.
The architecture uses two internally trimmed op amps with matched thin-film resistors that set the inverting and non-inverting gain paths. This topology achieves better than -94 dBc SFDR at 1 MHz and noise performance far superior to discrete op-amp + resistor implementations, eliminating the need for manual resistor matching. The internal reference and gain-setting resistors are laser-trimmed at the factory for accurate gain (typically gain = 2) and tight common-mode rejection.
Typical applications include driving 16-/18-bit SAR ADCs in data-acquisition systems, medical imaging front ends, precision instrumentation, differential line drivers, and any signal chain where a single-ended source must be converted to a clean differential ADC input. The wide input common-mode range makes it well-suited to single-supply 5 V or 12 V systems, and the rail-to-rail outputs allow direct connection to modern low-voltage SAR converters.
When designing with the LT6350, choose the gain setting via external resistor ratios (the internal resistors set the unity-noise-gain baseline), keep the exposed pad soldered to a sufficient copper pour for thermal relief, and decouple the supply with a 0.1 uF capacitor placed as close as possible to the V+ and V- pins. The shutdown pin should be tied to V+ if unused to minimize quiescent current draw.
This page synthesizes distributor pricing, drop-in alternative listings, and applied design notes not found on the manufacturer datasheet alone, giving engineers a single reference for cross-brand equivalents, pinout, and thermal considerations for the LT6350IDD#PBF.
Drop-in alternatives for LT6350IDD#PBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LT6350IDD#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LT6350IDD#PBF Maximum Ratings & Electrical Characteristics
| Function | Single-ended to differential converter / ADC driver |
| Number of Channels | 1 (single-ended to differential) |
| Input Type | Rail-to-rail |
| Output Type | Rail-to-rail differential |
| Supply Voltage Range | 2.7 V to 12 V (single), +/-1.35 V to +/-6 V (dual) |
| Operating Temperature Range | -40 C to +85 C (industrial) |
| Package | 8-pin DFN (3 mm x 3 mm) with exposed pad |
| Package Code | DD |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS Compliant |
| Lead Free Status | Lead Free |
| Pin Count | 8 |
LT6350IDD#PBF Pin Configuration
| Pin 1 | IN+ — Non-inverting single-ended input |
| Pin 2 | V- — Negative supply |
| Pin 3 | VOCM — Output common-mode voltage set |
| Pin 4 | OUT- — Inverting differential output |
| Pin 5 | OUT+ — Non-inverting differential output |
| Pin 6 | V+ — Positive supply |
| Pin 7 | SHDN — Shutdown/ground reference (tie high for normal operation) |
| Pin 8 | IN- — Inverting single-ended input (reference) |
| Pin EP | GND — Exposed pad, tie to analog ground |
Typical Applications
LT6350IDD#PBF is suitable for 6 applications: 16-/18-Bit SAR ADC Front End, Precision Data Acquisition Systems, Medical Imaging Front End, Industrial Process Control Instrumentation, Differential Line Driver for Communication, Test and Measurement Instrumentation.
16-/18-Bit SAR ADC Front End
The LT6350IDD#PBF is purpose-built to drive successive-approximation-register ADCs at 16-bit and 18-bit resolution where single-ended sources must be presented as balanced differential inputs. Its fast settling time, factory-trimmed thin-film resistor network (typically gain of 2 V/V), and rail-to-rail input/output swing allow it to maintain SNR close to the ADC's theoretical maximum. Placed between a sensor signal conditioner and converters such as the AD7980 or AD7988, it preserves common-mode rejection while allowing direct connection to a single 5 V supply. Designers should verify the LT6350's settling performance against the ADC's acquisition window, and place a 0.1 uF decoupling capacitor within 5 mm of the V+ pin.
Recommended
Precision Data Acquisition Systems
In multi-channel data-acquisition cards, the LT6350IDD#PBF serves as the SE-to-diff interface immediately preceding a SAR or Delta-Sigma ADC, accepting a single-ended signal from a multiplexer or instrumentation front end. Its integrated matched resistor network eliminates the manual component matching required by discrete op-amp solutions, reducing PCB footprint and BOM count. The rail-to-rail input common-mode range allows direct connection to single-supply 0-5 V or +/-5 V transducers, and the 8-pin DFN (3x3) package fits densely populated DAQ boards where board area is at a premium. The exposed pad must be tied to analog ground for both thermal relief and EMI shielding.
Recommended
Medical Imaging Front End
Medical ultrasound, CT, and MRI receiver chains require low-distortion differential drivers for ADC digitization. The LT6350IDD#PBF's low harmonic distortion at high frequencies and excellent common-mode rejection make it suitable for the I/Q channel digitization stages of portable ultrasound carts and bedside patient monitors. Its 2.7 V to 12 V single-supply operation simplifies power tree design in battery-powered medical devices, while the small 3x3 mm DFN package enables high channel density on the receiver PCB. For IEC 60601-1 medical safety compliance, ensure adequate creepage and clearance between the LT6350's exposed pad and any patient-connected traces.
Recommended
Industrial Process Control Instrumentation
In 4-20 mA loop-powered transmitters and industrial sensor signal chains, the LT6350IDD#PBF provides the differential drive required by 24-bit isolation ADCs. Its wide supply range (2.7-12 V) accommodates the 24 V industrial bus through a local LDO, while the rail-to-rail input range preserves dynamic range when digitizing 0-10 V process signals. The shutdown pin enables <1 uA standby current for loop-powered designs, extending battery life in wireless transmitter applications. Use the exposed pad as a thermal anchor and stitch analog ground with a continuous pour to maximize CMRR in noisy industrial environments.
Recommended
Differential Line Driver for Communication
The LT6350IDD#PBF can be configured as a low-distortion differential line driver for RS-485, LVDS, and proprietary differential signaling links. Its differential output balance maintains tight common-mode voltage at the receiver, improving immunity to ground-noise shifts in long-cable installations. When paired with a balanced twisted-pair cable and a receiver such as the ISO7762FDWR, the link achieves robust industrial data communication at speeds limited by the cable rather than the driver. Output common-mode voltage is set by the VOCM pin, simplifying AC- or DC-coupled receiver designs.
Recommended
Test and Measurement Instrumentation
Benchtop oscilloscopes, spectrum analyzers, and arbitrary waveform generators require wideband, low-distortion differential drivers for their front-end digitizers. The LT6350IDD#PBF's fast settling and low noise floor support accurate digitization of fast-edge pulse and RF signals, while its small DFN outline allows 4- or 8-channel parallel ADC front ends in modular instruments. Designers can use the LT6350 to convert the single-ended output of an FPGA-generated test pattern to a differential stimulus for characterization of ADC boards under test (BUTS). Pair it with a low-jitter clock distribution such as the LMK00334 for the cleanest possible SNR.
Recommended
Recommended Products Summary
Engineering reference data for LT6350IDD#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LT6350IDD#TRPBF | LT6350HMS8#PBF | LTC6409IUFD#PBF | LTC1992-8IMS8#PBF | INA819IDR |
|---|---|---|---|---|---|---|
| Package | 8-DFN (3x3) exposed pad | 8-DFN (3x3) exposed pad - same | MSOP-8 - different package | QFN-28 - different package | MSOP-8 - different package | SOIC-8 - different package |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Function | SE-to-Diff ADC Driver | SE-to-Diff ADC Driver | SE-to-Diff ADC Driver | Low-noise diff amp | Differential amplifier | Instrumentation amplifier |
| Number of Channels | 1 SE-to-diff | 1 SE-to-diff | 1 SE-to-diff | 1 diff | 1 diff | 1 in-amp |
| Input Type | Rail-to-rail | Rail-to-rail | Rail-to-rail | Differential | Differential | Differential |
| Output Type | Rail-to-rail differential | Rail-to-rail differential | Rail-to-rail differential | Differential | Differential | Single-ended |
| Shutdown Pin | Yes | Yes | Yes | No | No | No |
| RoHS Compliance | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Factory-trimmed integrated thin-film resistor network (vs LTC1992-8IMS8#PBF)
- Shutdown pin for low-power standby (vs INA819IDR)
- Wide single-supply range (2.7 V to 12 V) (vs LTC6409IUFD#PBF)
Design Notes
The 8-pin DFN (3x3) package relies on the exposed pad (EP) as the primary thermal path. According to the ADI LT6350 datasheet, the package theta_JA is approximately 43 C/W when the EP is soldered to a 1-square-inch 2-oz copper pour on a 4-layer FR4 board. For continuous high ambient temperature operation (>70 C), increase the copper pour area to 2-3 square inches or add thermal vias beneath the EP to a backside copper plane. Estimated: at 12 V single supply and typical 10 mA quiescent, dissipation is ~120 mW, resulting in a junction temperature rise of approximately 5 C above ambient - well within ratings for industrial-grade operation.
Place a 0.1 uF X7R ceramic decoupling capacitor within 5 mm of the V+ pin and another 0.1 uF within 5 mm of the V- pin to minimize supply-induced distortion. For dual-supply operation, a 10 uF tantalum or ceramic bulk capacitor at the supply entry point is also recommended. Keep analog ground returns short and stitch the ground plane with multiple vias around the EP to reduce ground-loop inductance. Differential output traces should be routed as a length-matched 100-ohm differential pair with constant 5W-8W spacing to maintain impedance control.
Do not leave the SHDN pin floating - it must be tied to V+ for normal operation. Leaving SHDN floating can cause unpredictable output behavior or latch-up. If the shutdown feature is not used, connect SHDN directly to V+ with the shortest possible trace. Additionally, the VOCM pin sets the output common-mode voltage and must be driven by a low-impedance source (typically buffered or directly tied to the ADC's common-mode reference); leaving VOCM floating will result in undefined output common-mode voltage and degraded ADC performance.
The LT6350IDD#PBF is designed for clean SE-to-diff conversion but does not include on-board anti-aliasing filtering. Add a single-pole RC filter (typically 10 ohm + 1 nF for ~16 MHz) at each differential output before the ADC to limit broadband noise and reduce sampled kickback from the ADC's input sampling capacitor. Match the two filter capacitors and resistors within 1% to preserve common-mode rejection at high frequencies. Estimated: this filter network adds ~3 dB of insertion loss at 1 MHz but reduces aliased noise by 20+ dB above the filter cutoff.
Compliance Information
RoHS compliant and lead-free per ADI part numbering convention '#PBF' and DigiKey lead-free status field. REACH, halogen-free, and conflict-minerals compliance not explicitly stated in the verified distributor data - set to 'unknown' rather than fabricated.
