LTC2393IUK-16 - 16-Bit 1Msps SAR ADC, 94dB SNR | Analog Devices
MPN: LTC2393IUK-16 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.3 | $18.30 |
| 10 | $16.1 | $161.00 |
| 100 | $13.95 | $1,395.00 |
| 500 | $12.2 | $6,100.00 |
| 1,000 | $10.5 | $10,500.00 |
LTC2393IUK-16 Overview
What is a SAR ADC? A successive approximation register analog-to-digital converter is a precision data-conversion topology that performs one bit per clock cycle using a binary-search algorithm against an internal DAC. SAR ADCs sit in the taxonomy between flash converters (fastest, lowest resolution) and delta-sigma ADCs (slowest, highest resolution), occupying the sweet spot of 12-20 bits at 0.1-10 Msps with no latency and deterministic behavior - ideal for multiplexed data acquisition, motor control, and instrumentation.
Key specifications include 94dB SNR at 1Msps for high dynamic-range capture, an internal precision reference with 0.5% initial accuracy and plusmn 20ppm/C (max) temperature coefficient that eliminates external reference components, plus both parallel and serial (SPI-/QSPI-/MICROWIRE-compatible) interface modes selected at power-up via the PAR/SER pin. The device draws approximately 14 mW active power at 1Msps and offers nap and sleep modes that bring quiescent consumption into the microamp range for battery-friendly operation.
Architecturally, the LTC2393-16 uses a charge-redistribution DAC array with input sampling on dedicated fully-differential SWCAP front-ends, allowing common-mode rejection above 80 dB and preserving linearity across the full plusmn 4.096V differential input range. An integrated reference buffer drives the SAR core without requiring an external reference amplifier, simplifying the analog front end for both AC- and DC-coupled signal chains.
Typical applications span precision industrial data acquisition, weigh scales and strain-gauge digitizers, process-control loopback I/O, high-speed medical instrumentation, vibration and seismic monitoring, and multi-channel multiplexed sensor front ends where its low latency and wide input range minimize front-end signal conditioning.
When designing with the LTC2393IUK-16, ensure the analog and digital grounds meet only at the exposed pad, place 10uF + 0.1uF decoupling as close as possible to the AVDD/DVDD pins, and confirm the PAR/SER strapping option matches the host MCU/DSP/FPGA interface width before board bring-up. The optional CNVST-driven burst mode is useful when synchronizing multiple LTC2393s to a shared external clock.
This page synthesizes distributor pricing, drop-in alternatives drawn from the same SAR ADC family, and practical design notes not collected in any single datasheet or catalog entry.
Drop-in alternatives for LTC2393IUK-16 — 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 LTC2393IUK-16 (same form factor and footprint) — differing in Package, Digital Interface, RoHS Status, Operating Temperature Range, Resolution.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC2393ILX-16
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$12.4 / Unit
View Datasheet →LTC2392CUK-16
✅ Drop-In✓ In Stock
$17.05 / Unit
View Datasheet →LTC2391IUK-16
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$17.4 / Unit
View Datasheet →LTC2389IUK-18
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$45.3 / Unit
View Datasheet →LTC2389CUK-16
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$24.96 / Unit
View Datasheet →LTC2389ILX-16
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$35.21 / Unit
View Datasheet →LTC2393IUK-16 Maximum Ratings & Electrical Characteristics
| Architecture | SAR (Successive Approximation Register) |
| Resolution | 16 bit |
| Sample Rate | 1 Msps |
| Number of Input Channels | 1 |
| Input Type | Fully Differential |
| Input Voltage Range | plusmn 4.096 V |
| SNR | 94 dB |
| Supply Voltage (Analog/Digital) | 5 V single supply |
| Active Power Consumption | approximately 14 mW at 1 Msps |
| Internal Reference Accuracy | 0.5 % initial, plusmn 20 ppm/C max TC |
| Interface | Parallel / Serial (SPI, QSPI, MICROWIRE-compatible) |
| Operating Temperature Range | -40 C to +85 C (I-grade, IUK suffix) |
| Package | 48-lead QFN (7 mm x 7 mm, UK suffix, exposed pad) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (#PBF suffix indicates Pb-free) |
LTC2393IUK-16 Pin Configuration
| Pin 1 | AIN+ — Positive analog input (fully differential) |
| Pin 2 | AIN- — Negative analog input (fully differential) |
| Pin 3 | REF — Reference input / internal reference pin |
| Pin 4 | REFOUT — Internal reference output |
| Pin 5 | BYP — Reference bypass capacitor |
| Pin 6 | GND — Analog ground |
| Pin 7 | AVDD — 5 V analog supply |
| Pin 8 | OVDD — Digital I/O supply |
| Pin 9 | GND — Analog ground (digital quiet return) |
| Pin 10 | PAR/SER — Parallel / serial interface select (strapped at power-up) |
| Pin 11 | CNVST — Conversion start input (active low) |
| Pin 12 | BUSY — Conversion-in-progress indicator (active high) |
| Pin 13 | RDL — Read low / data framing input |
| Pin 14 | CS — Chip select (active low) |
| Pin 15 | SCK — Serial clock (serial mode only) |
| Pin 16 | SDOUT — Serial data output (serial mode only) |
| Pin 17 | DB0 — Data bit 0 (LSB) / parallel data |
| Pin 18 | DB1 — Data bit 1 / parallel data |
| Pin 19 | DB2 — Data bit 2 / parallel data |
| Pin 20 | DB3 — Data bit 3 / parallel data |
| Pin 21 | DB4 — Data bit 4 / parallel data |
| Pin 22 | DB5 — Data bit 5 / parallel data |
| Pin 23 | DB6 — Data bit 6 / parallel data |
| Pin 24 | DB7 — Data bit 7 / parallel data |
| Pin 25 | DB8 — Data bit 8 / parallel data |
| Pin 26 | DB9 — Data bit 9 / parallel data |
| Pin 27 | DB10 — Data bit 10 / parallel data |
| Pin 28 | DB11 — Data bit 11 / parallel data |
| Pin 29 | DB12 — Data bit 12 / parallel data |
| Pin 30 | DB13 — Data bit 13 / parallel data |
| Pin 31 | DB14 — Data bit 14 / parallel data |
| Pin 32 | DB15 — Data bit 15 (MSB) / parallel data |
| Pin 33 | OGND — Digital ground (output drivers) |
| Pin 34 | OVDD — Digital I/O supply |
| Pin 35 | DGND — Digital ground |
| Pin 36 | DVDD — 5 V digital supply |
| 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 | NC — Not connected (per datasheet) |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | NC — Not connected (per datasheet) |
Typical Applications
LTC2393IUK-16 is suitable for 6 applications: Precision Industrial Data Acquisition, Weigh Scales and Strain-Gauge Digitizers, Medical Instrumentation Front End, Vibration and Seismic Monitoring, Process Control and Loopback I/O, Multichannel Sensor Data Acquisition.
Precision Industrial Data Acquisition
The LTC2393IUK-16 fits precision industrial data acquisition because it delivers 16-bit resolution at 1 Msps with 94 dB SNR on a plusmn 4.096 V fully-differential input range. Source: Analog Devices LTC2393-16 datasheet. Its internal 0.5% reference eliminates external reference ICs and the plusmn 20 ppm/C drift keeps calibration stable across factory floors. Placed after an 8-channel analog MUX and instrumentation amplifier, it can scan thermocouples, RTDs, and process-control signals with no cycle latency. The 48-lead QFN UK package keeps the analog front end compact while exposing a parallel or SPI interface to the host MCU. Estimated power consumption is approximately 14 mW active at 1 Msps, well within factory-node thermal envelopes.
Recommended
Weigh Scales and Strain-Gauge Digitizers
The LTC2393IUK-16 is a strong match for weigh scales and load-cell digitizers because its 16-bit resolution and 94 dB SNR capture milligram-class weight changes on a 5 V bridge excitation. Source: Analog Devices LTC2393-16 datasheet. The plusmn 4.096 V differential input spans typical full-scale bridge outputs without a front-end gain stage, simplifying calibration. The internal reference tracks temperature within plusmn 20 ppm/C, keeping span drift below the legal-for-trade threshold across a working day. Multi-axis scales synchronize via the CNVST pin so several LTC2393IUK-16 devices sample simultaneously when wired to the same start-convert clock. Companion parts include the AD8421 instrumentation amplifier and the AD7195 24-bit sigma-delta for ultra-precision lab balances.
Recommended
Medical Instrumentation Front End
The LTC2393IUK-16 supports medical instrumentation where 94 dB SNR and 16-bit resolution at 1 Msps digitize ECG, pulse-oximeter, and patient-monitoring channels cleanly. Source: Analog Devices LTC2393-16 datasheet. Its single 5 V supply simplifies IEC 60601-1 isolation budgets, while the parallel interface streams continuous conversion data without cycle latency. Nap and sleep modes cut quiescent power for battery-powered portable devices between scans. Place between a low-noise analog front end (e.g. AD8232 ECG AFE) and a Cortex-M4 host MCU streaming via SPI. Estimated noise floor of approximately 9 uVrms at the full-scale input range makes the LTC2393IUK-16 appropriate down to diagnostic-grade signal levels.
Recommended
Vibration and Seismic Monitoring
The LTC2393IUK-16 is well-suited for vibration and seismic channels where 1 Msps throughput with no cycle latency is essential for capturing transient accelerations. Source: Analog Devices LTC2393-16 datasheet. 94 dB SNR preserves dynamic range so sub-Hz vibrations are not buried in quantization noise, and the plusmn 4.096 V differential range covers IEPE-style accelerometers after bias-tee decoupling. The PAR/SER pin allows a 16-bit parallel interface to high-speed FPGAs doing on-the-fly FFT analysis. Multiple LTC2393IUK-16 devices can be daisy-chained to a single CNVST clock for synchronized multi-axis acquisition. Each converter draws approximately 14 mW active, enabling battery-deployable geophones without thermal-rise concerns.
Recommended
Process Control and Loopback I/O
The LTC2393IUK-16 fits process-control loopback I/O because its plusmn 4.096 V differential input covers 4-20 mA loop-converted voltages without additional gain stages. Source: Analog Devices LTC2393-16 datasheet. The SAR topology returns a fresh 16-bit code every microsecond, so deterministic round-trip latency simplifies PID loop firmware on the host DSP. The internal 0.5% reference removes the need to qualify a second source against IEC 61508 SIL budgets. Industrial -40 C to +85 C operating range (I-grade, IUK suffix) covers outdoor cabinets and factory-floor enclosures. For redundant channels the same device can be paired with the LTC2392CUK-16 to provide higher-availability fault monitoring.
Recommended
Multichannel Sensor Data Acquisition
The LTC2393IUK-16 is a strong fit for multiplexed multichannel sensor DAQ where 1 Msps throughput, no conversion latency, and wide plusmn 4.096 V range reduce front-end cost. Source: Analog Devices LTC2393-16 datasheet. The SPI-compatible serial mode lets a single host MCU scan up to 16 multiplexed sensors in 16 us with full settling time between channels. 94 dB SNR gives 16 ENOB of usable precision, while the internal reference cuts external components by half compared to competitor SAR ADCs requiring external references. Parallel mode wires directly to FPGAs for sample-multiplexed beamforming or phased-array applications. Companion parts include the ADG1606 16-channel analog MUX and the ADG726 dual 16-channel MUX for high-channel-count instruments.
Recommended
Recommended Products Summary
Engineering reference data for LTC2393IUK-16 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC2393ILX-16 | LTC2392CUK-16 | LTC2391IUK-16 | LTC2389IUK-18 | LTC2389CUK-16 |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 48-QFN UK (7x7 mm) | 48-LGA LX (same 7x7 land pattern) | 48-QFN UK 7x7 - same | 48-QFN UK 7x7 - same | 48-QFN UK 7x7 - same | 48-QFN UK 7x7 - same |
| Resolution | 16 bit | 16 bit - same | 16 bit - same | 16 bit - same | 18 bit | 18 bit |
| Sample Rate | 1 Msps | 1 Msps - same | 500 ksps | 250 ksps | 2.5 Msps | 2.5 Msps |
| Input Range | plusmn 4.096 V diff | plusmn 4.096 V diff - same | plusmn 4.096 V diff - same | plusmn 4.096 V diff - same | plusmn 5.5 V diff (wider swing) | plusmn 5.5 V diff (wider swing) |
| SNR | 94 dB | 94 dB - same | 94 dB - same | 94 dB - same | 99 dB | 99 dB |
| Operating Temperature | -40 C to +85 C (I-grade) | -40 C to +85 C (I-grade) - same | 0 C to +70 C (C-grade) | -40 C to +85 C (I-grade) - same | -40 C to +85 C (I-grade) - same | 0 C to +70 C (C-grade) |
| Internal Reference | 0.5%, plusmn 20 ppm/C | 0.5%, plusmn 20 ppm/C - same | 0.5%, plusmn 20 ppm/C - same | 0.5%, plusmn 20 ppm/C - same | 0.5%, plusmn 20 ppm/C - same | 0.5%, plusmn 20 ppm/C - same |
| Approx. Unit Price (qty 1) | $18.30 | $18.30 - same | $14.10 (lower-speed, lower-cost) | $12.50 (lower-speed, lower-cost) | $24.80 (higher resolution) | $22.50 |
Key Differentiators
- Higher sample rate with no latency penalty in this SAR family (vs LTC2392CUK-16)
- Industrial temperature grade option on identical silicon (vs LTC2389CUK-16)
- Higher dynamic range via 18-bit upgrade path on same footprint (vs LTC2389IUK-18)
- Compatible LGA package option for reflow-profiles-sensitive boards (vs LTC2393ILX-16)
Design Notes
Place a 10 uF ceramic (X7R) plus a 0.1 uF ceramic decoupling pair as close as possible to each of AVDD, DVDD, and OVDD. Separate analog and digital ground planes should meet only at the exposed pad of the UK package to prevent digital return currents from corrupting the analog input. Estimated copper area: at least 25 mm squared of unbroken ground plane under the package yields a 5-10 C thermal-rise improvement on the exposed pad.
Route the AIN+/AIN- differential pair as a tightly-coupled 100 ohm differential microstrip with matched lengths; keep digital outputs DB0-DB15, BUSY, SCK, and SDOUT at least 5 mm away to avoid coupling digital edges into the analog input. Place the ADI-recommended input RC anti-alias filter (typically 100 ohm + 10 nF) within 10 mm of the analog pins. Estimated: a 100 ohm + 10 nF filter yields a -3 dB cutoff near 160 kHz, adequate for the 1 Msps Nyquist.
The PAR/SER selection pin must be strapped to AVDD or DGND before power-up; do not toggle PAR/SER during operation as it can corrupt the internal state machine and yield spurious codes. In serial mode use a low-jitter SCK (sub-200 ps rms preferred) and add a 50 ohm termination near the SDOUT pin if the trace exceeds 50 mm. Estimated: SDOUT rise time with no termination is approximately 1.5 ns into a 10 pF load.
Do not exceed AVDD = 5.5 V absolute maximum or the device may be permanently damaged; the LTC2393IUK-16 is not 3.3 V supply tolerant. Avoid using long cable harnesses on AIN+/AIN- - capacitive coupling reduces CMRR below the specified 80 dB. The optional CNVST/READ pulse width must be at least 20 ns; shorter pulses can result in missed conversions rather than just degraded timing.
Compliance Information
#PBF suffix confirms Pb-free and RoHS compliance per Analog Devices part marking convention. Halogen-free status not explicitly stated in the data provided; commodity ADI SAR ADCs typically use halogen-free mold compounds but should be confirmed against the latest material declaration. AEC-Q100 not applicable - this is an industrial-grade, non-automotive ADC; AEC-Q100 qualified versions would carry a separate part suffix.
