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Analog Devices Inc. LTC2321CUFD-14#PBF
- Part No.:
- LTC2321CUFD-14#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
LTC2321CUFD-14#PBF.pdf
- Description:
- IC ADC 14BIT SAR 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,891
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Product details
Overview
LTC2321CUFD-14#PBF from Analog Devices is a dual-channel, 14-bit + sign successive approximation register (SAR) analog-to-digital converter with differential inputs, 2 Msps per channel throughput, ±1 LSB typical INL, 80 dB SNR at 500 kHz, and integrated 2.048 V / 4.096 V temperature-compensated reference. It operates from a single 3.3 V or 5 V supply and supports CMOS or LVDS serial interface for high-speed data acquisition in motor control and optical networking systems.
For engineers reviewing the LTC2321CUFD-14#PBF datasheet, LTC2321CUFD-14#PBF pinout, LTC2321CUFD-14#PBF application, or LTC2321CUFD-14#PBF equivalent, key selection criteria include guaranteed no-missing-codes performance at 14 bits, 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 LTC2321CUFD-14#PBF implements two independent SAR ADC cores sharing a common reference architecture and digital interface. Each channel features a fully differential sample-and-hold with 10 pF input capacitance and 15 Ω switch on-resistance, enabling direct connection to precision signal sources without external buffering.
Its timing architecture uses a falling-edge–triggered CNV input to initiate conversion with 220 ns typical conversion time and skew-matched CLKOUT output for deterministic data capture. The internal reference buffers (REFOUT1/REFOUT2) deliver 4.096 V ±0.2% with ≤20 ppm/°C drift and support external reference override via REFINT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 14-bit + sign (15-bit two's complement output); enables digitization of ±REFOUT full-scale differential input with overrange capability. |
| Sampling Rate | 2 Msps per channel; supports real-time acquisition of signals up to 10 MHz –3dB bandwidth with <3 ns transient response. |
| INL | ±1 LSB typical; ensures monotonicity and accurate end-point linearity for closed-loop control feedback paths. |
| SNR | 80 dB typical at fIN = 500 kHz; delivers 13.0 effective number of bits (ENOB) for high-fidelity signal reconstruction. |
| Power Dissipation | 33 mW per channel at 2 Msps (CMOS mode, VDD = 5 V); reduces thermal load in dense PCB layouts. |
| Reference | Internal 4.096 V ±0.2% (or 2.048 V) with ≤20 ppm/°C drift; eliminates need for external precision reference and associated layout complexity. |
| Supply Range | VDD: 4.75 V to 5.25 V (5 V operation); OVDD: 1.71 V to 2.63 V; supports interoperability with 1.8 V/2.5 V FPGA I/O banks. |
Pinout & Package
Package: 28-lead (4 mm × 5 mm) plastic QFN (UFD) with exposed pad (Pin 29) soldered to ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 8) | Analog power supply | Single 5 V rail powers both ADC cores and internal reference; requires local 10 µF + 0.1 µF bypassing. |
| AIN1+, AIN1– (Pins 7, 6) | Channel 1 differential analog input | Accepts ±4.096 V differential swing with 0 V to VDD common mode; no configuration needed for bipolar/unipolar modes. |
| AIN2+, AIN2– (Pins 2, 3) | Channel 2 differential analog input | Independent second channel with identical specs; enables simultaneous sampling for phase-sensitive applications. |
| CNV (Pin 9) | Conversion start trigger | Falling edge initiates hold-and-convert; must be driven by low-jitter source (<1 ps RMS jitter recommended). |
| SCK+, SCK– (Pins 21, 22) | Serial clock input | Differential LVDS or single-ended CMOS clock (up to 64 MHz); determines data readout timing and maximum throughput. |
| SDO1+, SDO1– (Pins 15, 16) | Channel 1 serial data output | MSB-first 15-bit two's complement code; LVDS mode requires 100 Ω differential termination at receiver. |
| CLKOUT+, CLKOUT– (Pins 17, 18) | Skew-matched output clock | Phase-aligned with SDO edges to eliminate setup/hold violations in FPGA-based capture logic. |
| REFOUT1, REFOUT2 (Pins 12, 26) | Reference buffer outputs | 4.096 V buffered references for each channel; decoupled locally with 10 µF + 0.1 µF ceramics (no vias). |
| REFINT (Pin 28) | Reference enable/disable | Tie to VDD for internal reference; ground to disable buffers and use external 1.25 V–5 V reference. |
| CMOS/LVDS (Pin 25) | I/O interface mode select | GND = CMOS; OVDD = LVDS; floating = low-power LVDS; configures driver strength and termination behavior. |
Key Features
| Feature | Design Value |
|---|---|
| No-cycle latency | Delivers first valid conversion result immediately after CNV falling edge-enables deterministic real-time control loop execution. |
| Dual independent SAR cores | Enables true simultaneous sampling of two signals (e.g., current/voltage in motor phase legs) without inter-channel timing skew. |
| Wide input common mode range (0 V to VDD) | Allows direct interface to op-amp outputs, isolated amplifiers, or sensor bridges without level-shifting circuitry. |
| Guaranteed no missing codes at 14 bits | Ensures monotonic transfer function across full temperature range (0°C to 70°C for LTC2321C grade), critical for position/speed encoders. |
| Low-power nap/sleep modes | Reduces total current to 5 µW in sleep mode-extends battery life in portable test equipment and remote DAQ nodes. |
Applications
| High-Speed Motor Control | Optical Network Monitoring |
|---|---|
|
Use Scenario: Real-time sampling of dual-phase current and bus voltage in servo drives operating at >20 kHz PWM frequencies. IC Role / Device Role / Timing Role: Dual-channel simultaneous ADC providing synchronized current/voltage feedback with <500 ps inter-channel matching for field-oriented control (FOC) algorithms. Use Value: Enables precise torque ripple suppression and dynamic response improvement by eliminating phase delay between current and voltage measurements. |
Use Scenario: Digitizing photodiode output and laser bias monitor signals in coherent optical transceivers for real-time power stabilization. IC Role / Device Role / Timing Role: High-SNR ADC capturing low-amplitude analog monitoring signals while rejecting switching noise from adjacent DC-DC converters. Use Value: 80 dB SNR and 85 dB CMRR ensure accurate detection of sub-mV signal variations amid high common-mode EMI in pluggable modules. |
| Industrial Data Acquisition | Automotive Battery Management |
|
Use Scenario: Multi-sensor acquisition (strain, temperature, vibration) in programmable logic controller (PLC) analog input modules requiring 14-bit resolution and long-term stability. IC Role / Device Role / Timing Role: Precision dual ADC with integrated 20 ppm/°C reference replacing external reference + dual ADC discrete solution. Use Value: Reduces BOM count by 3 components and improves system-level INL spec by eliminating reference mismatch between channels. |
Use Scenario: Cell voltage and pack current monitoring in 48 V mild-hybrid battery packs where space-constrained modules demand high integration. IC Role / Device Role / Timing Role: Dual ADC with 5 V supply compatibility and automotive-grade temp range (C-grade supports 0°C–70°C ambient). Use Value: Eliminates need for separate level-shifters when interfacing to 5 V microcontrollers and reduces thermal dissipation vs. older 16-bit sigma-delta alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7960BCPZ-RL7 | 18-bit, 5 Msps, single-channel only; requires external reference and separate digital interface for dual-channel use. | Higher resolution but lacks native dual-channel synchronization; increases PCB area and timing complexity for multi-signal acquisition. | Select when absolute precision > speed, and system can accommodate discrete channel interleaving or dual IC layout. |
| ADS8864IDGSR | 16-bit, 1 Msps, single-supply 3 V only; no integrated reference; CMOS-only interface; smaller 10-pin VSSOP package. | Lower power (15 mW) but sacrifices 2× throughput and common-mode flexibility; unsuitable for 5 V systems or LVDS FPGA interfaces. | Select for ultra-low-power, space-constrained 3 V embedded systems where 1 Msps and external reference are acceptable trade-offs. |
Compared with AD7960BCPZ-RL7 and ADS8864IDGSR, the LTC2321CUFD-14#PBF uniquely delivers dual-channel 2 Msps operation with integrated reference and flexible 3.3 V/5 V/LVDS support-reducing design effort for time-critical industrial and automotive DAQ systems.
Availability
LTC2321CUFD-14#PBF is available at Aetrix Electronics and suitable for high-speed motor control, optical network monitoring, and industrial data acquisition requiring stable component supply across extended production lifecycles.
Supply support for LTC2321CUFD-14#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2321 series was designed specifically for high-speed, high-accuracy data acquisition in space- and power-constrained systems-emphasizing dual-channel simultaneity, low-latency timing, and integrated reference stability without external components.
FAQ
What is the operating temperature range for the LTC2321CUFD-14#PBF?
The LTC2321CUFD-14#PBF is rated for 0°C to 70°C ambient operation (Commercial grade). This is confirmed by the "C" suffix in the part number and the Order Information table listing "0°C to 70°C" for LTC2321CUFD-14#PBF. It is not rated for industrial (–40°C to 85°C) or high-reliability (–40°C to 125°C) ranges.
Does the LTC2321CUFD-14#PBF support both CMOS and LVDS digital interfaces simultaneously?
No-the LTC2321CUFD-14#PBF supports either CMOS or LVDS mode, selected by the CMOS/LVDS pin (Pin 25): grounded for CMOS, tied to OVDD for LVDS, or floating for low-power LVDS. Both modes cannot operate concurrently; the interface type must be fixed at power-up.
Can the internal reference of the LTC2321CUFD-14#PBF be disabled to use an external reference?
Yes-driving REFINT (Pin 28) to GND disables both internal reference buffers (REFOUT1 and REFOUT2), allowing an external reference voltage from 1.25 V to 5 V to be applied directly to REFOUT1 and REFOUT2 pins. This is explicitly documented in the Pin Functions section and Electrical Characteristics table.
What is the maximum achievable throughput when using the LTC2321CUFD-14#PBF in LVDS mode?
The LTC2321CUFD-14#PBF maintains its full 2 Msps per channel throughput in LVDS mode. The ADC core timing (tCONV = 220 ns, tCYC = 500 ns minimum) is independent of interface mode; LVDS only affects the serial data transmission layer, not conversion rate.
Is the LTC2321CUFD-14#PBF pin-compatible with other variants in the LTC2321 family?
Yes-the LTC2321CUFD-14#PBF shares identical 28-lead QFN (UFD) packaging and pinout with LTC2321IUFD-14#PBF and LTC2321HUFD-14#PBF. All variants use the same mechanical footprint, thermal pad, and signal assignment; only temperature grade and screening differ.
LTC2321CUFD-14#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:
- 14
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-QFN (4x5)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2321CUFD-14#PBF FAQ
1.How can I place an order for LTC2321CUFD-14#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2321CUFD-14#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 LTC2321CUFD-14#PBF reliable?
The price and inventory of LTC2321CUFD-14#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2321CUFD-14#PBF is usually 5 days.
3.What payment methods are accepted for LTC2321CUFD-14#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2321CUFD-14#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2321CUFD-14#PBF?
LTC2321CUFD-14#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2321CUFD-14#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 LTC2321CUFD-14#PBF?
For technical support, including LTC2321CUFD-14#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2321CUFD-14#PBF requirements.
6.How does Aetrix verify that LTC2321CUFD-14#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2321CUFD-14#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 LTC2321CUFD-14#PBF meets industry standards.
7.What is the process for return or replacement of LTC2321CUFD-14#PBF?
All LTC2321CUFD-14#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2321CUFD-14#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 LTC2321CUFD-14#PBF part is unused and in its original packaging.
Return procedure for LTC2321CUFD-14#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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