My Inquiry
My Account
Analog Devices Inc. LTC2321IUFD-16#PBF
- Part No.:
- LTC2321IUFD-16#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC2321IUFD-16#PBF.pdf
- Description:
- IC ADC 16BIT SAR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:159
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2321IUFD-16#PBF from Analog Devices is a dual-channel, 16-bit, 2 Msps successive approximation register (SAR) analog-to-digital converter with differential inputs, ±4 LSB typical INL, 81 dB SNR at 500 kHz, and integrated 4.096 V temperature-compensated reference. It operates from a single 3.3 V or 5 V supply, supports CMOS or LVDS serial interface, and targets high-speed data acquisition in industrial instrumentation and optical networking.
For engineers reviewing the LTC2321IUFD-16#PBF datasheet, LTC2321IUFD-16#PBF pinout, LTC2321IUFD-16#PBF application, or LTC2321IUFD-16#PBF equivalent, key selection criteria include guaranteed 16-bit no-missing-codes operation, wide input common mode range (0 V to VDD), low-power nap/sleep modes (5 µW), and dual-channel simultaneous sampling with no cycle latency.
Technical Context
The LTC2321IUFD-16#PBF implements two independent SAR ADC cores sharing a common reference architecture and digital interface. Each channel features a fully differential input stage with 8 VP-P full-scale range, 85 dB CMRR at 500 kHz, and aperture jitter of 1 psRMS, enabling high-fidelity signal capture in noisy environments.
Its SPI-compatible serial interface supports both CMOS (1.8 V–2.5 V I/O) and LVDS modes, with skew-matched CLKOUT outputs for deterministic timing. The internal 4.096 V reference exhibits ≤20 ppm/°C drift and is buffered on REFOUT1 and REFOUT2 pins, each with dedicated return (REFRTN1/REFRTN2) and bypass (VBYP1/VBYP2) terminals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees monotonic transfer function and no missing codes across full operating temperature range (–40°C to +85°C). |
| Sampling Rate | 2 Msps per channel - enables real-time capture of signals up to 10 MHz bandwidth without undersampling. |
| INL (Typ) | ±4 LSB - ensures accurate amplitude representation in precision measurement systems such as automated test equipment. |
| SNR (Typ) | 81 dB at fIN = 500 kHz - delivers >13-bit effective resolution for high-fidelity signal analysis in communications receivers. |
| Power (Typ) | 31 mW per channel at 2 Msps - balances performance and thermal management in space-constrained embedded systems. |
| Reference Voltage | 4.096 V (internal, buffered) - provides precise scaling for 125 µV/LSB step size and eliminates external reference design complexity. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood applications requiring extended thermal reliability. |
Pinout & Package
Package: 28-lead (4 mm × 5 mm) plastic QFN with exposed pad (Pin 29 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 8) | Core analog supply | Accepts 3.3 V or 5 V; must be bypassed with 10 µF + 0.1 µF ceramics close to each pin for stable conversion performance. |
| AIN1+, AIN1– (Pins 7, 6) | Differential analog input channel 1 | Supports ±4.096 V differential swing with 0 V to VDD common mode range; no configuration required for unipolar/bipolar signals. |
| AIN2+, AIN2– (Pins 2, 3) | Differential analog input channel 2 | Independent second channel with identical specs; enables true simultaneous sampling for phase-sensitive applications. |
| CNV (Pin 9) | Conversion start trigger | Falling edge initiates acquisition-to-conversion sequence; requires low-jitter source for <500 ps aperture matching between channels. |
| REFOUT1, REFOUT2 (Pins 12, 26) | Buffered reference outputs | Nominally 4.096 V; each referenced to its own return (REFRTN1/REFRTN2); disable via REFINT = GND for external reference use. |
| SCK+, SCK– (Pins 21, 22) | Serial clock input | Differential LVDS or single-ended CMOS clock input; supports up to 64 MHz SCK frequency for fast readout. |
| SDO1+, SDO1– / SDO2+, SDO2– (Pins 15–16, 19–20) | Channel 1 & 2 serial data outputs | MSB-first output synchronized to SCK falling edge; LVDS mode requires 100 Ω differential termination at receiver. |
| CLKOUT+, CLKOUT– (Pins 17–18) | Skew-matched output clock | Provides latch timing aligned to SDO edges; eliminates setup/hold uncertainty in FPGA/CPLD interfacing. |
| CMOS/LVDS (Pin 25) | I/O interface mode select | GND = CMOS; OVDD = LVDS; floating = low-power LVDS - configures driver strength and power consumption. |
| REFINT (Pin 28) | Internal reference enable | Tie to VDD to activate internal buffers; tie to GND to disable REFOUT1/REFOUT2 and allow external reference injection. |
Key Features
| Feature | Design Value |
|---|---|
| Dual simultaneous sampling | Enables phase-coherent acquisition across two channels without inter-channel delay skew-critical for motor current sensing and I/Q demodulation. |
| No cycle latency | Delivers first valid conversion result immediately after CNV falling edge, eliminating pipeline delay and simplifying real-time control loop timing. |
| Wide input common mode range (0 V to VDD) | Allows direct connection to sensors or op-amp outputs without level-shifting circuitry, reducing BOM count and layout complexity. |
| Integrated 4.096 V reference with ≤20 ppm/°C drift | Eliminates need for external precision reference IC and associated compensation components, improving system accuracy and long-term stability. |
| Nap and sleep modes (5 µW) | Reduces idle power by >6000× versus active mode, extending battery life in portable data loggers and remote sensor nodes. |
Applications
| High-Speed Data Acquisition Systems | Optical Networking |
|---|---|
Use Scenario: Real-time digitization of multi-channel sensor arrays in automated test equipment with sub-microsecond timing constraints. IC Role / Device Role / Timing Role: Dual-channel SAR ADC providing simultaneous 16-bit sampling at 2 Msps with deterministic latency for closed-loop feedback control. Use Value: Eliminates external sample-and-hold circuits and reduces FPGA resource usage by delivering ready-to-process data with no pipeline delay. |
Use Scenario: Monitoring analog bias currents and photodiode outputs in coherent optical transceivers operating at 100+ Gbps. IC Role / Device Role / Timing Role: Precision ADC capturing dynamic laser diode parameters with 81 dB SNR and 85 dB CMRR to reject switching noise from adjacent DC-DC converters. Use Value: Enables real-time calibration and adaptive bias control without sacrificing bandwidth or introducing quantization-induced error in BER-critical paths. |
| Industrial Motor Control | Communications Baseband Processing |
Use Scenario: Sampling three-phase motor currents and DC bus voltage in servo drives requiring synchronized multi-channel acquisition. IC Role / Device Role / Timing Role: Dual ADC performing interleaved or parallel sampling of current sense amplifiers with matched aperture delay (<500 ps) for vector control accuracy. Use Value: Achieves <0.1% torque ripple through precise current reconstruction, directly enabled by simultaneous sampling and low INL (±4 LSB). |
Use Scenario: Digitizing baseband I/Q signals in software-defined radio front-ends where dynamic range and harmonic distortion impact adjacent channel interference. IC Role / Device Role / Timing Role: High-linearity ADC delivering –90 dB THD and 100.9 dB SFDR to preserve signal integrity in dense spectral environments. Use Value: Supports 256-QAM modulation schemes by maintaining >80 dB SINAD across full Nyquist band, reducing post-processing correction overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel, high-speed SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8864IDRCT | Single-supply 3 V only; 1 MSPS max; no integrated reference; CMOS-only interface. | Lower power (15 mW), but lacks LVDS support and simultaneous dual-channel capability. | Select when cost-sensitive, lower-speed (<1 MSPS), and external reference design is acceptable. |
| AD7606C-16BSTZ | 8-channel, pseudo-differential inputs; ±10 V range; parallel + SPI interface; 1 MSPS per channel. | Higher channel count but slower throughput and no LVDS; requires external reference and more complex timing. | Select for multi-sensor monitoring systems needing >2 channels and ±10 V input range, accepting trade-off in speed and interface flexibility. |
Compared with ADS8864IDRCT and AD7606C-16BSTZ, the LTC2321IUFD-16#PBF uniquely combines dual-channel 2 Msps throughput, integrated 4.096 V reference, LVDS/CMOS interface flexibility, and simultaneous sampling in a compact QFN package-making it optimal for space-constrained, high-bandwidth applications demanding minimal external components and deterministic timing.
Availability
LTC2321IUFD-16#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, optical networking modules, and industrial motor control applications requiring stable component supply and guaranteed industrial temperature operation.
Supply support for LTC2321IUFD-16#PBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2321IUFD-16#PBF belongs to Analog Devices' high-speed precision SAR ADC product line, designed specifically for applications demanding simultaneous multi-channel sampling, low latency, and integrated reference stability in harsh thermal environments.
FAQ
What is the maximum sampling rate supported by the LTC2321IUFD-16#PBF?
The LTC2321IUFD-16#PBF supports a maximum sampling rate of 2 Msps per channel. This is specified over the full industrial temperature range (–40°C to +85°C) and applies to both channels independently. At this rate, the device achieves 81 dB SNR and ±4 LSB INL while dissipating 31 mW per channel under typical conditions.
Does the LTC2321IUFD-16#PBF require an external reference voltage?
No, the LTC2321IUFD-16#PBF includes an onboard low-drift (≤20 ppm/°C) 4.096 V temperature-compensated reference buffer on both REFOUT1 and REFOUT2 pins. The internal reference can be disabled by grounding REFINT (Pin 28), allowing use of an external reference from 1.25 V to VDD if higher accuracy or different voltage scaling is needed.
How does the LTC2321IUFD-16#PBF handle simultaneous sampling across both channels?
The LTC2321IUFD-16#PBF performs true simultaneous sampling using independent sample-and-hold circuits for each channel. A single CNV falling edge triggers acquisition on both AIN1 and AIN2 inputs at the same instant, with aperture delay matching specified at ≤500 ps-enabling accurate phase relationship preservation in applications like motor current sensing and I/Q signal processing.
What digital interface options does the LTC2321IUFD-16#PBF support?
The LTC2321IUFD-16#PBF supports both CMOS and LVDS serial interfaces. Interface mode is selected via the CMOS/LVDS pin (Pin 25): grounded for CMOS (1.8 V–2.5 V logic), tied to OVDD for standard LVDS, or left floating for low-power LVDS. The device provides skew-matched CLKOUT outputs to simplify timing-critical FPGA interfacing in either mode.
What power-saving modes are available on the LTC2321IUFD-16#PBF?
The LTC2321IUFD-16#PBF offers Nap Mode (2.55 mA typical) and Sleep Mode (1 µA typical), both accessible via control of the CNV and interface lines. In Sleep Mode, total supply current drops to 5 µW, making it suitable for battery-powered remote sensors or intermittent-monitoring systems where ultra-low quiescent power is essential between acquisition bursts.
LTC2321IUFD-16#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 2M
- Number of Inputs:
- 2
- Input Type:
- Differential, Pseudo-Differential
- Data Interface:
- LVDS - Serial, Serial
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 3.13V ~ 3.47V, 5V
- Voltage - Supply, Digital:
- 3.13V ~ 3.47V, 5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-QFN (4x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2321IUFD-16#PBF FAQ
1.How can I place an order for LTC2321IUFD-16#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2321IUFD-16#PBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC2321IUFD-16#PBF reliable?
The price and inventory of LTC2321IUFD-16#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2321IUFD-16#PBF is usually 5 days.
3.What payment methods are accepted for LTC2321IUFD-16#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2321IUFD-16#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2321IUFD-16#PBF?
LTC2321IUFD-16#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2321IUFD-16#PBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC2321IUFD-16#PBF?
For technical support, including LTC2321IUFD-16#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2321IUFD-16#PBF requirements.
6.How does Aetrix verify that LTC2321IUFD-16#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2321IUFD-16#PBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2321IUFD-16#PBF meets industry standards.
7.What is the process for return or replacement of LTC2321IUFD-16#PBF?
All LTC2321IUFD-16#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2321IUFD-16#PBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC2321IUFD-16#PBF part is unused and in its original packaging.
Return procedure for LTC2321IUFD-16#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2321IUFD-16#PBF Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
