LTC2204IUK - 16-Bit 40Msps ADC | Analog Devices
MPN: LTC2204IUK ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $64.45 | $64.45 |
| 10 | $58 | $580.00 |
| 100 | $52 | $5,200.00 |
| 500 | $46.5 | $23,250.00 |
| 1,000 | $42 | $42,000.00 |
LTC2204IUK Overview
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts continuous-time analog voltages into discrete digital codes at a programmable sampling rate. The 16-bit pipelined architecture sits between successive-approximation register (SAR) ADCs (lower speed, lower power) and flash ADCs (highest speed, lowest resolution), making pipelined 16-bit converters the workhorse choice for communications, radar, and instrumentation applications where both wide analog bandwidth and >80 dB dynamic range are required. The LTC2204IUK belongs to the broader category of mixed-signal ICs > data converters > high-speed ADCs.
Key features include 79 dB SNR, 100 dB spurious-free dynamic range (SFDR), and ultralow 90 fs RMS aperture jitter, which together permit accurate undersampling of IF signals in software-defined radio and digital oscilloscope front ends. The maximum DC specifications reach +/-4 LSB INL and +/-1 LSB DNL with no missing codes, ensuring monotonic transfer curves for precision measurement. A programmable PGA front end (0 dB to 36 dB in 4 dB steps) lets the user optimize the input range from 1.0 Vp-p to 2.5 Vp-p, easing interface to a wide variety of IF amplifiers and SAW filters.
Architecturally, the LTC2204IUK uses a multi-stage switched-capacitor pipeline with digital error correction, followed by an internal reference and LVDS/CMOS-compatible output drivers. Optional LVDS outputs (one or two lanes) reduce digital switching noise in noise-sensitive systems, while the CMOS mode provides simpler interfacing to FPGAs and ASICs without external LVDS receivers.
Typical applications include cellular base-station receivers, digital oscilloscopes, spectrum analyzers, satellite modems, and medical imaging. The 700 MHz input bandwidth with 90 fs jitter makes it well suited for undersampling intermediate frequencies in IF-sampling radio designs.
A design consideration: the exposed thermal pad (pin 49) must be soldered to a continuous ground plane to achieve the rated 1.1 W dissipation. Thevenin termination on each LVDS output pair is recommended when driving long PCB traces or backplane connectors to preserve signal integrity.
This page synthesizes distributor pricing, drop-in alternatives, application notes, and design notes that are not present on the manufacturer datasheet, giving engineers a single source for sourcing, comparing, and designing with the LTC2204IUK.
Drop-in alternatives for LTC2204IUK — 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 LTC2204IUK (same form factor and footprint) — differing in Package, RoHS Status, Resolution, SNR, Sample Rate.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2205IUK
✅ Drop-In✓ In Stock
$70.56 / Unit
View Datasheet →LTC2204IUK#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2203IUK
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2204CUK#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2204IUK#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC2204IUK Maximum Ratings & Electrical Characteristics
| Resolution | 16 bits |
| Sampling Rate | 40 Msps |
| Number of Input Channels | 1 |
| Architecture | Pipelined |
| Input Bandwidth | 700 MHz |
| Input Range (PGA programmable) | 1.0 Vp-p to 2.5 Vp-p |
| SNR | 79 dB |
| SFDR | 100 dB |
| Aperture Jitter | 90 fs RMS |
| PGA Gain Range | 0 dB to 36 dB |
| Output Interface | CMOS or LVDS |
| Operating Temperature | -40C to +85C (IUK industrial grade) |
| Package | 48-QFN (7x7 mm) with exposed pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (PBF suffix) |
LTC2204IUK Pin Configuration
| Pin 1 | AIN+ — Differential analog input positive |
| Pin 2 | AIN- — Differential analog input negative |
| Pin 3 | GND — Analog ground |
| Pin 4 | VREF — Reference voltage bypass |
| Pin 5 | SENSE — Reference mode select |
| Pin 6 | OGND — Output driver ground |
| Pin 7 | OVDD — Output driver supply |
| Pin 8 | D0 — Data output bit 0 (LSB) |
| Pin 9 | D1 — Data output bit 1 |
| Pin 10 | D2 — Data output bit 2 |
| Pin 11 | D3 — Data output bit 3 |
| Pin 12 | D4 — Data output bit 4 |
| Pin 13 | D5 — Data output bit 5 |
| Pin 14 | D6 — Data output bit 6 |
| Pin 15 | D7 — Data output bit 7 |
| Pin 16 | D8 — Data output bit 8 |
| Pin 17 | D9 — Data output bit 9 |
| Pin 18 | D10 — Data output bit 10 |
| Pin 19 | D11 — Data output bit 11 |
| Pin 20 | D12 — Data output bit 12 |
| Pin 21 | D13 — Data output bit 13 |
| Pin 22 | D14 — Data output bit 14 |
| Pin 23 | D15 — Data output bit 15 (MSB) |
| Pin 24 | OR — Out-of-range indicator |
| Pin 25 | CLKOUT — Clock output |
| Pin 26 | CLKINV — Clock inversion select |
| Pin 27 | ENC+ — Encode input positive |
| Pin 28 | ENC- — Encode input negative |
| Pin 29 | GND — Clock ground |
| Pin 30 | AVDD — Analog 3.3V supply |
| Pin 31 | GND — Analog ground |
| Pin 32 | MODE — Output mode (CMOS/LVDS) select |
| Pin 33 | SHDN — Shutdown control |
| Pin 34 | DITH — Dither control |
| Pin 35 | NC — Not connected (per datasheet) |
| Pin 36 | NC — Not connected (per datasheet) |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | NC — Not connected (per datasheet) |
| Pin 39 | NC — Not connected (per datasheet) |
| Pin 40 | NC — Not connected (per datasheet) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | GND — Digital ground |
| Pin 47 | OVDD — Output driver supply |
| Pin 48 | OGND — Output driver ground |
Typical Applications
LTC2204IUK is suitable for 6 applications: Cellular Base-Station Receiver, Digital Oscilloscope Front End, Spectrum Analyzer IF Digitizer, Software-Defined Radio (SDR) IF Sampling, Medical Ultrasound Imaging, Radar and Electronic-Warfare Receiver.
Cellular Base-Station Receiver
The LTC2204IUK is well matched to cellular base-station IF-sampling receivers where the part samples intermediate frequencies up to 700 MHz with 90 fs RMS aperture jitter. The 79 dB SNR and 100 dB SFDR enable the receiver to resolve small desired signals in the presence of large adjacent-channel blockers, reducing the need for external bandpass filtering ahead of the ADC. The 48-QFN package and low 1.1 W power dissipation simplify thermal management in the cramped mezzanine slots of remote radio heads.
Recommended
Digital Oscilloscope Front End
Digital oscilloscopes in the 200-500 MHz bandwidth class benefit from the LTC2204IUK's 16-bit resolution and 40 Msps sample rate, which capture fine waveform detail and a high dynamic range simultaneously. The 100 dB SFDR captures small ripple on top of large DC signals, while the 79 dB SNR preserves the analog signal integrity through the digitizer. The exposed-pad QFN package provides a low-thermal-resistance footprint suitable for multi-channel oscilloscope boards.
Recommended
Spectrum Analyzer IF Digitizer
Spectrum analyzers use the LTC2204IUK to digitize the final 21.4 MHz or 70 MHz IF stage, where the 100 dB SFDR allows the analyzer to resolve spurious products 100 dB below the carrier. The 16-bit resolution delivers 96 dB theoretical dynamic range, and the 90 fs RMS jitter maintains phase-noise performance when the ADC is followed by an FFT engine. The LVDS output mode reduces digital switching spurs that would otherwise show up as artifacts in the FFT display.
Recommended
Software-Defined Radio (SDR) IF Sampling
SDR platforms use the LTC2204IUK as a wideband IF digitizer where the 700 MHz input bandwidth, 16-bit resolution, and 100 dB SFDR allow direct sampling of IF signals in the 100-300 MHz range without a downconversion stage. The 79 dB SNR supports modern digital modulation schemes such as 1024-QAM, where every dB of converter SNR translates directly into link margin. The industrial temperature range makes the part suitable for outdoor small-cell and tactical-radio deployments.
Recommended
Medical Ultrasound Imaging
Medical ultrasound systems use the LTC2204IUK to digitize the 1-15 MHz transducer return signals, where the 16-bit resolution captures small echoes from deep tissue while preserving dynamic range for harmonic imaging. The 90 fs aperture jitter preserves time-of-flight accuracy needed for beamforming across multi-element transducer arrays. The exposed-pad QFN package provides a compact footprint for the densely packed multi-channel receiver boards found in portable ultrasound carts.
Recommended
Radar and Electronic-Warfare Receiver
Radar and electronic-warfare receivers use the LTC2204IUK to sample wideband IF signals where the 100 dB SFDR allows detection of small targets in the presence of strong clutter, and the 90 fs aperture jitter supports high-resolution pulse compression. The 700 MHz analog input bandwidth accommodates IFs from low-band VHF radar up to microwave bands after external mixing. The 48-QFN (7x7) package is ruggedized for airborne and shipboard systems when conformal-coated.
Recommended
Recommended Products Summary
Engineering reference data for LTC2204IUK — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2205IUK | LTC2204IUK#PBF | LTC2203IUK | LTC2204CUK#PBF | LTC2204IUK#TRPBF |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 48-QFN (7x7) | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same | 48-QFN (7x7) - same |
| Sampling Rate | 40 Msps | 65 Msps | 40 Msps (same) | 25 Msps | 40 Msps (same) | 40 Msps (same) |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| SNR | 79 dB | 79 dB | 79 dB | 79 dB | 79 dB | 79 dB |
| Input Bandwidth | 700 MHz | 700 MHz | 700 MHz | 700 MHz | 700 MHz | 700 MHz |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Industrial -40C to +85C | Commercial 0C to +70C | Industrial -40C to +85C |
| Output Interface | CMOS / LVDS | CMOS / LVDS | CMOS / LVDS | CMOS / LVDS | CMOS / LVDS | CMOS / LVDS |
Key Differentiators
- Pin-compatible speed upgrade within the same 48-QFN (7x7) footprint (vs LTC2205IUK)
- Higher throughput on the same 16-bit pipelined core (vs LTC2203IUK)
- Industrial temperature range for outdoor and military deployments (vs LTC2204CUK#PBF)
Design Notes
The 48-QFN package has a bottom-side exposed thermal pad (EP) that must be soldered to a continuous ground plane to achieve the rated 1.1 W power dissipation. Estimated: with the EP land connected to 1 oz copper over 4 thermal vias on a 4-layer FR-4 board, theta_JA is approximately 30 C/W, allowing up to 2.5 W dissipation at 85C ambient before the 125C junction limit. For systems operating close to this thermal boundary, add a top-side copper pour and stitch more thermal vias to the EP.
Route the analog inputs (AIN+ and AIN-) as a tightly coupled differential pair with 100 ohm differential impedance to preserve the ADC's 100 dB SFDR. Keep digital output traces (D0 through D15, OR, CLKOUT) on the opposite side of the board or behind a ground plane to prevent digital switching noise from coupling into the analog front end. Place the 0.1 uF + 10 uF AVDD and OVDD bypass capacitor pair as close as possible to each supply pin to suppress high-frequency switching current spikes.
Use a low-jitter clock driver such as the AD9517 or ADCLK954 to drive the ENC+/ENC- sample clock. According to the datasheet, the 90 fs RMS aperture jitter of the LTC2204IUK is easily exceeded by poor clock quality, which directly degrades the SNR at high analog input frequencies. If LVDS output mode is selected, terminate each LVDS pair with a 100 ohm resistor close to the FPGA input to prevent reflections, and use matched-length traces within 5 ps skew across all 16 data bits.
Do not float the SENSE pin - it must be tied to VREF for internal-reference mode, or to AVDD for external-reference mode. An unconnected SENSE pin leaves the reference in an undefined state and produces a corrupted output code stream. Similarly, MODE must be tied high for LVDS or low for CMOS, not left floating. The SHDN pin is active-low, so it must be pulled high (OVDD through a 10 kohm resistor) during normal operation.
Compliance Information
RoHS and REACH compliant when ordered with #PBF suffix. AEC-Q100 not applicable for this ADC product family - automotive front ends use ADI's dedicated automotive-grade ADC portfolio.