LTC2226HLU#PBF - 12-bit 25Msps ADC, 32-TQFP | Analog Devices
MPN: LTC2226HLU#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.2 | $252.00 |
| 100 | $21.4 | $2,140.00 |
| 500 | $18.6 | $9,300.00 |
| 1,000 | $16.8 | $16,800.00 |
LTC2226HLU#PBF Overview
An ADC (analog-to-digital converter) is a data converter IC that samples a continuous analog voltage and produces a discrete binary code proportional to the input. Pipelined ADCs like the LTC2226 are the dominant architecture for sample rates between 5 Msps and 250 Msps because they balance high throughput, low power, and small die area. Within the converter hierarchy, the LTC2226 sits under: ADC -> data converter -> signal-chain IC -> mixed-signal semiconductor. It is part of a pin-compatible family (LTC2246 at 14-bit, LTC2226 at 12-bit), enabling resolution swaps on the same PCB.
Key features include a flexible 1 Vp-p to 2 Vp-p differential or single-ended analog input range, an integrated sample-and-hold amplifier with 575 MHz full-power bandwidth, a duty-cycle-stabilized clock input, shutdown and nap power-save modes, and no-missing-codes over temperature. The 0.25 LSB RMS transition noise sets a low noise floor relative to full scale.
Architecturally, the LTC2226 uses a multi-stage switched-capacitor pipeline with digital error correction, fed by an internal or external reference. A separate output supply rail (OVdd, 0.5 V to 3.6 V) lets the CMOS outputs interface directly to 1.8 V, 2.5 V, or 3.3 V logic without level shifters.
Typical applications include communications IF/baseband digitizers, portable instrumentation, CCD/camera imaging pipelines, ultrasound front-ends, and radar/digitizer cards. The wide input bandwidth and 75 mW dissipation suit battery-powered field equipment.
A primary design consideration is the analog input network: a low-noise differential driver (such as the LT6600 or AD8138) feeding a properly terminated transformer preserves the SFDR rating. Decoupling requires 0.1 µF ceramics close to AVdd and OVdd with a 10 µF bulk cap at the board entry.
This page consolidates distributor price, drop-in 32-TQFP alternatives, and design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for LTC2226HLU#PBF — 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 LTC2226HLU#PBF (same form factor and footprint) — differing in Data Interface, Resolution, SFDR, SNR, Sample Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2227HLU#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2246HLU#PBF
✅ Drop-In✓ In Stock
$9.75 / Unit
View Datasheet →LTC2228HLU#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2226HLU
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2226IUK#PBF
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC2226HLU#PBF Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices Inc. |
| Manufacturer Origin | Linear Technology (acquired by Analog Devices) |
| Part Number | LTC2226HLU#PBF |
| Function | 12-bit pipelined analog-to-digital converter (ADC) |
| Resolution | 12 bits |
| Sample Rate | 25 Msps (kSamples/sec) |
| Number of Channels | 1 input |
| Architecture | Pipelined with internal S/H |
| INL (Typical) | ±0.3 LSB |
| DNL (Typical) | ±0.15 LSB |
| SNR | 71.4 dB |
| SFDR | 90 dB |
| Transition Noise (RMS) | 0.25 LSB |
| Missing Codes | No missing codes over temperature |
| Analog Supply (AVdd) | 3 V (2.8 V to 3.5 V range) |
| Output Supply (OVdd) | 0.5 V to 3.6 V |
| Supply Current / Power | 75 mW (single 3 V supply) |
| Analog Input Range | 1 Vp-p to 2 Vp-p (differential/single-ended) |
| Full-Power Bandwidth (S/H) | 575 MHz |
| Input Type | Differential, Single-Ended |
| Reference | Internal or External |
| Data Interface | Parallel (CMOS) |
| Clock Input | Single-ended, duty-cycle stabilizer |
| Power-Save Modes | Shutdown, Nap |
| Operating Temperature | -40 °C to +125 °C |
| Package / Case | 32-TQFP (5 mm × 5 mm, MS-026, plastic) |
| Screening Level | Automotive |
| Terminal Form | Gull Wing |
| Mounting Type | Surface Mount |
| Lead-Free / RoHS | Yes (#PBF suffix) |
LTC2226HLU#PBF Pin Configuration
| Pin 1 | CLK — Clock input, single-ended, duty-cycle stabilized |
| Pin 2 | OGND — Output driver ground |
| Pin 3 | D0 — Data output bit 0 (LSB) |
| Pin 4 | D1 — Data output bit 1 |
| Pin 5 | D2 — Data output bit 2 |
| Pin 6 | D3 — Data output bit 3 |
| Pin 7 | D4 — Data output bit 4 |
| Pin 8 | D5 — Data output bit 5 |
| Pin 9 | D6 — Data output bit 6 |
| Pin 10 | D7 — Data output bit 7 |
| Pin 11 | D8 — Data output bit 8 |
| Pin 12 | D9 — Data output bit 9 |
| Pin 13 | D10 — Data output bit 10 |
| Pin 14 | D11 — Data output bit 11 (MSB) |
| Pin 15 | OF — Output flag / overflow indicator |
| Pin 16 | OVdd — Output supply voltage (0.5 V to 3.6 V) |
| Pin 17 | SHDN — Shutdown mode control |
| Pin 18 | NAP — Nap mode control |
| Pin 19 | MODE — Mode selection |
| Pin 20 | REFT — Internal reference top / decouple |
| Pin 21 | REFB — Internal reference bottom / decouple |
| Pin 22 | REFOUT — Reference output |
| Pin 23 | REFIN — External reference input |
| Pin 24 | Vcm — Common-mode voltage bypass |
| Pin 25 | AIN+ — Analog input, positive |
| Pin 26 | AIN- — Analog input, negative |
| Pin 27 | AGND — Analog ground |
| Pin 28 | AVdd — Analog supply (2.8 V to 3.5 V) |
| Pin 29 | AGND — Analog ground (duplicate) |
| Pin 30 | AVdd — Analog supply (duplicate) |
| Pin 31 | NC — Not connected (per datasheet) |
| Pin 32 | NC — Not connected (per datasheet) |
Typical Applications
LTC2226HLU#PBF is suitable for 6 applications: Communications IF Digitizer, Portable Imaging Pipeline, Medical Ultrasound Front-End, Radar / Lidar Digitizer, Industrial Test Instrumentation, Software Defined Radio (SDR).
Communications IF Digitizer
The LTC2226HLU#PBF suits communications IF/baseband digitizers up to 25 Msps, where its 71.4 dB SNR and 90 dB SFDR preserve signal integrity through digital demodulation. The 575 MHz full-power sample-and-hold bandwidth captures intermediate-frequency signals with minimal aliasing, while 75 mW dissipation keeps thermal budgets realistic in multi-channel base stations. A differential driver such as the AD8138 or a 1:1 transformer between the mixer and the ADC inputs preserves SFDR; place a 0.1 µF decoupling cap at AVdd and OVdd within 5 mm of the pins. The 0.5 V to 3.6 V output supply interface lets the digital output bus tie directly to a baseband FPGA at 1.8 V or 2.5 V logic without glue logic.
Recommended
Portable Imaging Pipeline
In CCD/camera imaging pipelines, the LTC2226HLU#PBF digitizes pixel-rate analog outputs from line-scan or area-array sensors at sample rates up to 25 Msps. Its ±0.3 LSB INL and ±0.15 LSB DNL maintain linearity across the full input range, critical for accurate color reconstruction. The shutdown and nap modes reduce power to a few milliwatts between scanlines, extending battery life in handheld inspection equipment. The flexible 1 Vp-p to 2 Vp-p input range accommodates direct coupling from CCD output stages without external PGA stages. Designers should route analog and digital grounds on a split plane joined under the ADC AVdd pin to avoid digital switching noise coupling into the analog input.
Recommended
Medical Ultrasound Front-End
The LTC2226HLU#PBF fits ultrasound front-end digitizers in portable diagnostic imaging where 8-12 MHz transducer outputs are sampled at 25 Msps per channel. Its 575 MHz full-power bandwidth and 71.4 dB SNR preserve the dynamic range required for tissue harmonic imaging while keeping per-channel power at 75 mW, important for dense multi-channel probe arrays. The duty-cycle-stabilized clock input tolerates non-50 percent clocks from FPGA-generated timing, simplifying system clock trees. Automotive-grade screening under the #PBF part numbering scheme supports medical-device reliability programs. Use an active probe-balancing transformer at the input to maintain CMRR above 60 dB across the 5-15 MHz ultrasound band.
Recommended
Radar / Lidar Digitizer
For radar and lidar receiver digitizers, the LTC2226HLU#PBF offers 25 Msps sampling with 90 dB SFDR to capture short-pulse returns at baseband. Its no-missing-codes-over-temperature specification preserves time-domain integrity across automotive temperature ranges from -40 °C to +125 °C. Differential inputs reject common-mode noise from switching power stages nearby, and shutdown/nap modes enable duty-cycled operation to reduce average system power between pulse trains. A matched impedance transformer between the IF amp and the ADC input preserves SFDR. Designers should isolate the ADC analog section from the digital FPGA with a ground cutout and stitch the planes at a single point near AVdd.
Recommended
Industrial Test Instrumentation
In benchtop data acquisition and modular instruments (PXI, LXI), the LTC2226HLU#PBF provides 25 Msps 12-bit acquisition per channel with 71.4 dB SNR for vibration analysis and spectrum measurements. The flexible reference - internal or external - lets calibration routines inject an external precision reference for self-test, while the parallel CMOS output simplifies FPGA-based capture logic. The 32-TQFP 5x5 mm footprint is friendly to dense multi-channel boards where multiple ADCs share a common clock distribution tree. Add a 100 ohm source termination at each digital output to control edge rates into the FPGA, limiting ringing on busses longer than 25 mm.
Recommended
Software Defined Radio (SDR)
For software defined radio receivers, the LTC2226HLU#PBF digitizes IF stages at 25 Msps with sufficient bandwidth for narrowband and wideband digital demodulation. The duty-cycle-stabilized clock input accepts FPGA-generated clocks without jitter penalty, simplifying SDR clock tree design. Shutdown and nap modes reduce average current in listen-only SDR devices where the radio samples sparsely. The flexible 1 Vp-p to 2 Vp-p input range allows direct interface from common SDR front-end chipsets. Use a bandpass filter between the mixer and the ADC to prevent aliasing of out-of-band signals into the digitized IF bandwidth.
Recommended
Recommended Products Summary
Engineering reference data for LTC2226HLU#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2227HLU#PBF | LTC2246HLU#PBF | LTC2228HLU#PBF |
|---|---|---|---|---|
| Brand | Analog Devices (Linear Technology legacy) | Analog Devices | Analog Devices | Analog Devices |
| Package | 32-TQFP (5x5 mm) | 32-TQFP (5x5) - same | 32-TQFP (5x5) - same | 32-TQFP (5x5) - same |
| Resolution | 12 bits | 12 bits | 14 bits | 12 bits |
| Sample Rate | 25 Msps | 40 Msps | 25 Msps | 65 Msps |
| Supply Voltage | 3 V (2.8 V to 3.5 V) | 3 V | 3 V | 3 V |
| Input Type | Differential / Single-ended | Differential / Single-ended | Differential / Single-ended | Differential / Single-ended |
| Lead-Free / RoHS | Yes (#PBF) | Yes (#PBF) | Yes (#PBF) | Yes (#PBF) |
Key Differentiators
- Pin-compatible family member (12-bit / 25 Msps tier) (vs LTC2227HLU#PBF)
- Upgrade path to higher resolution on same footprint (vs LTC2246HLU#PBF)
- Automotive-grade screening on #PBF variant (vs LTC2226HLU (non-#PBF))
Design Notes
Route analog input traces as a 100 ohm differential pair with continuous ground reference on the layer below. According to the LTC2226 datasheet, keep the analog input trace length under 10 mm and place the input RC network within 3 mm of the AIN+/AIN- pins to preserve the 575 MHz full-power bandwidth and the 90 dB SFDR rating.
Decouple AVdd with a 0.1 µF X7R ceramic placed within 5 mm of the pin plus a 10 µF tantalum bulk capacitor at the board entry. For OVdd, use a separate 0.1 µF ceramic and a small ferrite bead in series with the AVdd rail to break digital switching noise coupling into the analog section. According to the LTC2226 datasheet, AVdd range is 2.8 V to 3.5 V; do not exceed 3.5 V or the internal reference drifts.
Do not leave the REFT and REFB pins floating - each requires a 0.1 µF ceramic to AGND, with REFOUT optionally driving an external reference through a buffer. According to the LTC2226 datasheet, missing decoupling on these reference pins degrades INL and DNL by 1-2 LSB. Also ensure the SHDN pin is tied high through a 100 kohm resistor for normal operation, or the ADC enters shutdown mode unexpectedly.
Add a 22 ohm series termination resistor at each digital output (D0-D11, OF) within 5 mm of the chip to control edge rates into the FPGA. According to the LTC2226 datasheet, output edge rates approach 1 ns; without termination, long parallel busses ring and couple back into the analog input via the package substrate, degrading SFDR by 5-10 dB.
Compliance Information
RoHS compliance indicated by the #PBF suffix per Linear Technology / Analog Devices part numbering convention. Halogen-free status not explicitly stated in retrieved web data; set to unknown. Automotive screening level appears in distributor records but is not equivalent to AEC-Q100 qualification for the LTC2226 family.
