LTC2227IUH - 12-Bit 40Msps Low Power 3V ADC | Analog Devices
MPN: LTC2227IUH ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $14.33 | $14.33 |
| 10 | $12.9 | $129.00 |
| 100 | $11.45 | $1,145.00 |
| 500 | $10.18 | $5,090.00 |
| 1,000 | $9.05 | $9,050.00 |
LTC2227IUH Overview
An ADC (analog-to-digital converter) is a data converter integrated circuit that samples a continuous-time analog signal and outputs a discrete-time digital code proportional to the input amplitude. Pipelined ADCs like the LTC2227IUH use a multi-stage architecture with per-stage flash sub-ADCs and digital error correction, enabling high sampling rates (tens to hundreds of Msps) at moderate resolution (10-14 bits) while dissipating far less power than full-flash architectures. Within the converter taxonomy, the LTC2227IUH sits as: ADC -> data converter -> mixed-signal IC -> semiconductor.
Key features include a pipelined architecture with digital error correction, fully differential input stage with adjustable common-mode voltage, selectable internal bandgap reference (2.5V or optional external reference), and CMOS-compatible parallel output bus. The differential input accepts both single-ended and fully differential drive, simplifying front-end design with op-amps or transformers for communication and imaging front-ends.
The 32-lead QFN (5x5 mm) exposed-pad package provides a low thermal resistance path to the PCB ground plane, allowing sustained 40 Msps operation at 3V without additional cooling. The pin-compatible LTC2228 (65 Msps) and LTC2226 (25 Msps) variants in the same QFN-32 footprint let designers scale dynamic performance without re-laying out the PCB.
Typical applications include cellular basestation receiver IF digitizers, handheld imaging systems, portable oscilloscopes and digital storage scopes, cable head-end equipment, and spectrum analyzers. The low 135 mW dissipation also suits battery-powered instrumentation such as ultrasound front-ends and portable radar digitizers.
When designing with this converter, place the analog input coupling network and the internal reference bypass capacitor as close as possible to the AVDD and REFH/REFL pins. Treat the digital outputs as 40 Msps switching signals - route them over a continuous ground plane and keep them away from the analog input traces to avoid digital feedback into the sample-and-hold.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineers with a single canonical reference for the LTC2227IUH.
Drop-in alternatives for LTC2227IUH — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LTC2227IUH (same form factor and footprint) — differing in Package, Resolution, RoHS Status, Sample Rate, Power Dissipation.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2228IUH
✅ Drop-In✓ In Stock
$10.85 / Unit
View Datasheet →LTC2226IUH
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2227IUH#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2227IUH#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2227CUH
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2227IUH Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| Sample Rate | 40 Msps |
| Number of Channels | 1 |
| Architecture | Pipelined |
| Analog Supply Voltage | 2.7 V to 3.4 V (3 V typical) |
| Power Dissipation | 135 mW at 40 Msps (3V) |
| SNR | 71.3 dB at Nyquist input |
| SFDR | 90 dB at Nyquist input |
| Input Type | Differential, single-ended capable |
| Reference | Internal 2.5 V bandgap or external |
| Digital Output | CMOS parallel |
| Package | 32-QFN (5x5 mm) with exposed pad |
| Operating Temperature Range (Industrial) | -40 C to +85 C |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (PBF suffix) |
LTC2227IUH Pin Configuration
| Pin 1 | OGND — Output logic ground |
| Pin 2 | D11 — Data output bit 11 (MSB) |
| Pin 3 | D10 — Data output bit 10 |
| Pin 4 | D9 — Data output bit 9 |
| Pin 5 | D8 — Data output bit 8 |
| Pin 6 | D7 — Data output bit 7 |
| Pin 7 | D6 — Data output bit 6 |
| Pin 8 | D5 — Data output bit 5 |
| Pin 9 | D4 — Data output bit 4 |
| Pin 10 | D3 — Data output bit 3 |
| Pin 11 | D2 — Data output bit 2 |
| Pin 12 | D1 — Data output bit 1 |
| Pin 13 | D0 — Data output bit 0 (LSB) |
| Pin 14 | OGND — Output logic ground |
| Pin 15 | OVDD — Output logic supply |
| Pin 16 | CLKOUT — Clock output (data-ready clock) |
| Pin 17 | CLK — Clock input |
| Pin 18 | ENC — Encode (clock) complementary input |
| Pin 19 | SHDN — Shutdown (active high) |
| Pin 20 | OF — Output format select |
| Pin 21 | GND — Ground |
| Pin 22 | REFL — Reference decoupling low |
| Pin 23 | REFH — Reference decoupling high |
| Pin 24 | VCM — Common-mode voltage |
| Pin 25 | VEE — Analog ground (3V return) |
| Pin 26 | AVDD — Analog 3V supply |
| Pin 27 | AIN+ — Analog positive input |
| Pin 28 | AIN- — Analog negative input |
| Pin 29 | VEE — Analog ground (3V return) |
| Pin 30 | AVDD — Analog 3V supply |
| Pin 31 | SENSE — Reference sense / ground reference |
| Pin 32 | VREF — Voltage reference (2.5V internal) |
Typical Applications
LTC2227IUH is suitable for 6 applications: Cellular Basestation IF Digitizer, Portable Handheld Imaging System, Portable Digital Storage Oscilloscope, Cable Head-End Receiver, Spectrum Analyzer IF Digitizer, Radar and Sonar Front-End (Burst Sampling).
Cellular Basestation IF Digitizer
The LTC2227IUH digitizes intermediate-frequency signals in cellular basestation receivers, where its 40 Msps sample rate captures IF carriers up to 20 MHz while its 71.3 dB SNR and 90 dB SFDR maintain symbol-decoding integrity. Deployed between the mixer/upconverter stage and the digital demodulator/DSP, the converter delivers CMOS-compatible parallel outputs directly to a baseband ASIC or FPGA. Operating from a 3V analog rail at 135 mW dissipation, it suits both macro-cell base-station cards and small-cell base units where board density and thermal budget are constrained. Designers can later upgrade to the pin-compatible LTC2228IUH (65 Msps) for wider-bandwidth LTE-Advanced or 5G NR channels without changing the PCB layout.
Recommended
Portable Handheld Imaging System
In battery-powered handheld imaging products such as digital ultrasound probes, endoscopy cameras, and industrial borescopes, the LTC2227IUH digitizes the pre-processed analog sensor signal at 40 Msps, providing enough bandwidth for standard-definition CCD/CIS outputs. Its low 135 mW dissipation at 3V preserves battery runtime, while the exposed-pad 32-QFN package keeps the layout under 25 mm² - critical for compact handhelds. Designers pair the LTC2227IUH with a low-noise front-end transimpedance amplifier and use its CMOS parallel output bus to stream pixel data into an FPGA or application processor. The selectable internal 2.5V reference simplifies BOM by eliminating the need for an external precision reference IC.
Recommended
Portable Digital Storage Oscilloscope
The LTC2227IUH serves as the single-shot digitizer in entry-level 100 MHz-class portable oscilloscopes, where its 40 Msps real-time sample rate (with equivalent-time operation extending to higher effective rates) enables accurate capture of repetitive transients. Its 71.3 dB SNR ensures the oscilloscope's ENOB (effective number of bits) approaches 11.5, while the 90 dB SFDR keeps harmonic-distortion spurs below the noise floor for clean FFT analysis modes. The 3V single-supply operation and 135 mW dissipation support battery-powered field instruments, and the 32-QFN (5x5) footprint fits within the dense front-end assembly alongside the attenuator and trigger circuitry. The pipelined architecture with digital error correction guarantees low aperture-jitter for high-amplitude edge timing accuracy.
Recommended
Cable Head-End Receiver
Inside cable-TV head-end receivers and DOCSIS cable-modem termination systems (CMTS), the LTC2227IUH digitizes downstream QAM carriers with its 40 Msps pipeline sampling cleanly above the symbol rate. Its 71.3 dB SNR preserves modulation-error-ratio (MER) headroom for 256-QAM and 1024-QAM downstream channels, while 90 dB SFDR prevents adjacent-channel spurs from corrupting the demodulated constellation. Operating from a 3V rail at 135 mW, the part scales into multi-channel receiver cards where many LTC2227IUH devices (or the pin-compatible LTC2228IUH for wider bandwidths) sit on a single backplane. The CMOS parallel output reduces host-FPGA pin-count overhead compared with LVDS-output ADCs.
Recommended
Spectrum Analyzer IF Digitizer
Inside portable and benchtop spectrum analyzers, the LTC2227IUH performs intermediate-frequency (IF) digitization after the third or fourth mixer stage, providing 40 Msps real-time capture with 71.3 dB SNR. This dynamic range is sufficient to display 90 dB-wide sweep spans in modern spectrum analyzers when combined with on-board FFT acceleration in the host FPGA. The low 135 mW power dissipation allows dense multi-stage IF digitizer cards, while the 32-QFN (5x5) footprint leaves board space for the analog anti-alias filter and gain stages. The selectable external-reference mode supports high-stability TCXO/OCXO references needed for precise carrier-frequency measurement.
Recommended
Radar and Sonar Front-End (Burst Sampling)
The LTC2227IUH is well-suited to short-range radar, sonar, and LIDAR front-ends that digitize returning pulse bursts at 40 Msps while the transmit stage is muted. Pipelined ADCs with low aperture jitter - a hallmark of the LTC2227 family - preserve timing-resolution across the pulse, allowing accurate pulse-position and Doppler processing by the host DSP. The industrial -40 C to +85 C temperature range (IUH suffix) supports outdoor and ruggedized enclosures, and the 3V single-supply operation simplifies battery or PoE-powered remote sensor modules. Using the pin-compatible LTC2226IUH (25 Msps) lets designers reduce power when only short-range returns are needed.
Recommended
Recommended Products Summary
Engineering reference data for LTC2227IUH — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2228IUH | LTC2226IUH | LTC2227IUH#PBF | LTC2227IUH#TRPBF | LTC2227CUH |
|---|---|---|---|---|---|---|
| Package | 32-QFN (5x5) | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same | 32-QFN (5x5) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Sample Rate | 40 Msps | 65 Msps | 25 Msps | 40 Msps | 40 Msps | 40 Msps |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Supply Voltage | 3 V | 3 V | 3 V | 3 V | 3 V | 3 V |
| Power Dissipation | 135 mW | ~175 mW | ~100 mW | 135 mW | 135 mW | 135 mW |
| Temperature Grade | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Commercial 0 C to +70 C |
| Shipping Format | Tube | Tube | Tube | Tube | Tape & Reel | Tube |
Key Differentiators
- Pin-compatible multi-speed family in identical QFN-32 (5x5) (vs LTC2228IUH (65 Msps))
- Lower power dissipation at the same 12-bit class (vs LTC2248IUH (14-bit))
- Selectable internal 2.5V reference for BOM reduction (vs External-reference-only ADCs)
Design Notes
Estimated: at 40 Msps CMOS switching, the LTC2227IUH generates fast edge rates on D0-D11 - route these outputs as matched-length traces over a continuous ground plane and physically separate them from the AIN+/AIN- input pair and the VREF/REFH/REFL decoupling loop to avoid digital feedback into the sample-and-hold. Maintain at least 5 mm of ground-plane clearance between analog and digital sections on a four-layer stackup with the second layer as a solid ground plane.
Bypass AVDD and OVDD with separate 10 uF tantalum + 0.1 uF ceramic pairs placed within 5 mm of the pins. Tie the exposed thermal pad to a low-inductance ground polygon (4-6 thermal vias to the inner ground plane) to keep junction-to-ambient thermal resistance within the datasheet rating, supporting the 135 mW continuous dissipation without derating.
Do not float the SHDN pin - tie it low through a 10 kohm resistor if unused. The SENSE pin selects internal (2.5V) or external reference; strap to VREF for internal reference, or to a clean external reference for higher absolute accuracy. Driving the analog inputs single-ended without biasing VCM to mid-supply degrades SFDR by 10+ dB - use a transformer or fully differential op-amp driver for best harmonic performance.
Compliance Information
RoHS compliance requires the #PBF suffix on the order code; the standard LTC2227IUH (tin-lead) is discontinued for new designs. Not AEC-Q100 qualified - this is not an automotive-grade ADC.
