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Analog Devices Inc. LTC1821BIGW#PBF
- Part No.:
- LTC1821BIGW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 36-BSOP (0.295", 7.50mm Width)
- Datasheet:
-
LTC1821BIGW#PBF.pdf
- Description:
- IC DAC 16BIT V-OUT 36SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,636
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Product details
Overview
LTC1821BIGW#PBF from Analog Devices (formerly Linear Technology) is a 16-bit parallel-input voltage-output DAC with on-chip 4-quadrant multiplying resistors, ±10V bipolar or 0V to 10V unipolar output capability, 2µs settling time to 0.0015%, and 1LSB max INL/DNL over –40°C to 85°C. It serves as a precision analog output stage in industrial control loops requiring fast, glitch-free waveform generation.
For engineers reviewing the LTC1821BIGW#PBF datasheet, LTC1821BIGW#PBF pinout, LTC1821BIGW#PBF application, or LTC1821BIGW#PBF equivalent, key selection criteria include guaranteed 1LSB monotonicity across temperature, internal deglitcher delivering <2nV·s impulse, ±15V analog supply support, SSOP-36 package compatibility, and asynchronous CLR for zero-scale reset.
Technical Context
The LTC1821BIGW#PBF implements a hybrid R-2R ladder (13 LSBs) plus decoded MSB segments, with integrated feedback (RFB), offset (ROFS), and 4-quadrant resistors (R1/R2/RCOM/REF) enabling true 4-quadrant multiplication without external precision resistors. Its on-die high-speed amplifier delivers 20V/µs slew rate and settles to 0.0015% in 2µs for 10V steps.
Digital interface uses double-buffered 16-bit parallel architecture with independent WR (write to input register) and LD (load to DAC register) controls, supporting synchronous update of multiple DACs. Asynchronous CLR resets both registers - to zero scale for LTC1821 variants like this one.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - supports 65,536 discrete output levels with monotonic transfer function |
| INL / DNL | ±1 LSB max over –40°C to 85°C - ensures no missing codes and accurate transfer curve fidelity |
| Settling Time | 2 µs to 0.0015% for 10V step - enables >400kSPS update rate in closed-loop control |
| Glitch Impulse | <2 nV·s - minimizes transient energy injection into sensitive analog signal paths |
| Analog Supply | ±4.5V to ±16.5V - supports operation from ±5V up to ±15V rails with headroom |
| Output Range | ±10V bipolar or 0V to 10V unipolar - configurable via external resistor network per mode |
| Package | 36-lead SSOP (GW) - 0.300" wide body, 0.025" pitch, RoHS-compliant lead finish |
Pinout & Package
Package: 36-lead plastic SSOP (GW), 0.300" wide, 0.025" lead pitch, exposed pad not present. Pin 1 marked by beveled corner; pins numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DGND (1) | Digital ground reference | Must connect to system digital ground plane; separate from AGNDS/AGNDF to avoid noise coupling |
| VCC (2) | Digital supply input | 4.5V–5.5V logic supply; requires local 0.1µF bypass to DGND |
| D3–D0 (3–6) | LSB digital inputs | Parallel data bus bits 3 through 0; VIH ≥2.4V, VIL ≤0.8V |
| CLR (7) | Asynchronous clear | Active-low reset to zero scale; resets both input and DAC registers independently of WR/LD |
| REF (8) | Reference input / R2 node | Accepts ±10V (up to ±15V); presents R/8 impedance in unipolar mode |
| RCOM (9) | 4-quadrant resistor center tap | Connect to inverting input of external op amp in 4-quadrant mode; short to REF in 2-quadrant |
| R1 (10) | 4-quadrant resistor R1 | Tied to external reference in 4-quadrant mode; shorted to REF in 2-quadrant operation |
| ROFS (11) | Bipolar offset resistor | Swings ±10V (up to ±15V); tied to RFB in unipolar, to R1 in bipolar configuration |
| RFB (12) | Feedback resistor | Internally connected to VOUT; forms I-to-V conversion path with on-die amplifier |
| VOUT (13) | Voltage output | Driven by internal amplifier; ±12.6V swing into 2kΩ load at ±15V supplies |
| IOUT (14) | Current output | Internal DAC current node; connected to VOUT via 22pF (unipolar) or 15pF (bipolar) capacitor |
| V+ (15) | Analog positive supply | +4.5V to +16.5V; powers internal amplifier and analog core |
| AGNDS (16) | Analog ground sense | Low-impedance connection point for analog ground return; tie directly to star ground |
| AGNDF (17) | Analog ground force | Second analog ground terminal; must be tied to same low-impedance ground as AGNDS |
| DNC* (18,19,21) | Internally connected, no external connection | Do not route traces or place components; floating connections degrade performance |
| V– (20) | Analog negative supply | –4.5V to –16.5V; complements V+ for bipolar operation and amplifier rail support |
| NC (22) | No connection | Not bonded internally; leave unconnected and unstubbed |
| LD (23) | Load control | Active-high latch signal; rising edge triggers deglitcher and updates DAC register from input register |
| WR (24) | Write control | Active-low strobe; writes 16-bit parallel data from bus into input register |
| D15–D4 (25–36) | MSB to bit 4 digital inputs | Completes full 16-bit parallel bus; all inputs share same VIH/VIL thresholds and 8pF capacitance |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 4-quadrant resistors | Eliminates need for external precision R-networks in bipolar ±10V applications |
| Integrated deglitcher | Reduces switching transients to <2nV·s, critical for low-distortion waveform synthesis |
| Double-buffered parallel interface | Enables simultaneous update of multiple LTC1821 devices using shared WR/LD timing |
| On-die high-speed amplifier | 20V/µs slew rate and 2µs settling enable use without external op amp in many designs |
| Asynchronous zero-scale reset | CLR pin forces DAC output to 0V regardless of supply state or clock timing |
| Industrial temperature grade | Specified from –40°C to +85°C with full 1LSB INL/DNL guarantee |
Applications
| Process Control Loop Output | Precision Instrumentation Calibration |
|---|---|
Use Scenario: Generating precise analog setpoints for PID controllers in PLC-based manufacturing systems. IC Role / Device Role / Timing Role: Voltage-output DAC providing stable, low-glitch 0V–10V or ±10V command signals to valve actuators and motor drives. Use Value: 1LSB linearity ensures sub-0.0015% setpoint accuracy across temperature, reducing calibration drift in field-deployed equipment. | Use Scenario: Calibrating multimeter front-ends and automated test equipment (ATE) source-measure units. IC Role / Device Role / Timing Role: Reference-grade analog output generator used to inject known voltages into DUT inputs during self-test sequences. Use Value: 2µs settling and <2nV·s glitch allow rapid stepping between calibration points without post-settling delay or transient-induced measurement error. |
| Direct Digital Synthesis (DDS) Waveform Generator | Software-Controlled Gain/Offset Adjustment |
Use Scenario: Building compact arbitrary waveform generators for lab equipment and embedded signal sources. IC Role / Device Role / Timing Role: High-fidelity voltage-output stage driven by FPGA or microcontroller parallel bus to reconstruct sine, triangle, or custom waveforms. Use Value: Monotonic 16-bit resolution and guaranteed 1LSB DNL prevent harmonic distortion artifacts in synthesized waveforms. | Use Scenario: Dynamically adjusting gain and DC offset in programmable analog front-ends for sensor signal conditioning. IC Role / Device Role / Timing Role: Dual-function DAC configuring both programmable-gain amplifier (PGA) reference and offset nulling voltage. Use Value: On-chip 4-quadrant resistors enable independent bipolar adjustment of gain scaling and offset correction without external resistor matching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-output DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1657IG#PBF | 16-bit parallel DAC, 3.3V/5V logic, 10µs settling, ±1LSB INL only at 25°C | Lower speed, narrower temp range (–40°C to 85°C not guaranteed for INL), no on-chip 4-quadrant resistors | Select when cost sensitivity outweighs speed/linearity requirements and external resistor network is acceptable |
| AD5761RBRUZ | 16-bit serial DAC, 10µs settling, ±0.5 LSB INL over –40°C to 125°C, integrated reference | Serial interface reduces PCB routing; wider temp range but slower; requires external op amp for ±10V output | Select when board space is constrained and SPI interface aligns with system architecture |
Compared with LTC1821BIGW#PBF, LTC1657IG#PBF trades speed and guaranteed full-temperature linearity for lower cost and simpler biasing, while AD5761RBRUZ offers superior temperature stability and integration at the expense of parallel interface flexibility and native ±10V drive capability.
Availability
LTC1821BIGW#PBF is available at Aetrix Electronics and suitable for process control systems, precision instrumentation, direct digital waveform generation, and software-controlled gain/offset adjustment requiring stable component supply across extended temperature ranges.
Supply support for LTC1821BIGW#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC1821BIGW#PBF belongs to Linear's precision DAC product line, designed specifically for industrial automation and test equipment demanding guaranteed 16-bit monotonicity, ultra-low glitch, and robust bipolar output capability without external trimming.
FAQ
What is the guaranteed integral nonlinearity (INL) specification for LTC1821BIGW#PBF over its full operating temperature range?
The LTC1821BIGW#PBF guarantees ±1 LSB maximum INL over the industrial temperature range of –40°C to +85°C. This is explicitly specified in the Electrical Characteristics table under "INL Integral Nonlinearity" with condition "TMIN to TMAX" and grade "G", confirming it applies across the full rated temperature range - not just at 25°C. The B-grade part meets this spec with typical performance of ±0.35 LSB.
Does LTC1821BIGW#PBF require an external op amp to achieve ±10V output in bipolar mode?
No, LTC1821BIGW#PBF does not require an external op amp to achieve ±10V output in bipolar mode. Its integrated high-speed amplifier, combined with on-chip 4-quadrant resistors (R1, R2, ROFS, RFB, RCOM), enables full ±10V output directly. External op amps like the LT1468 are optional enhancements for improved settling or drive capability - not mandatory for basic bipolar operation.
How does the asynchronous CLR pin function on LTC1821BIGW#PBF, and what is its reset state?
The asynchronous CLR pin on LTC1821BIGW#PBF is active-low and resets both the input and DAC registers to zero scale (all bits = 0), producing 0V output in unipolar mode or –10V in bipolar mode. Unlike LD/WR, CLR operates independently of clock edges and takes effect immediately upon assertion, making it ideal for fail-safe initialization or emergency shutdown sequences in safety-critical systems.
What is the maximum allowable analog supply voltage range for LTC1821BIGW#PBF, and how does it affect output swing?
LTC1821BIGW#PBF supports analog supplies from ±4.5V to ±16.5V. At ±15V supplies, VOUT delivers ±12.6V into a 2kΩ load; at ±5V supplies, output swing reduces to ±2.6V. The device maintains full 16-bit linearity and 2µs settling across this entire supply range, enabling flexible system-level power architecture without sacrificing precision performance.
Can LTC1821BIGW#PBF operate with a 2.5V reference voltage, and what output ranges are supported?
Yes, LTC1821BIGW#PBF supports 2.5V reference inputs. With VREF = ±2.5V, it delivers unipolar outputs of 0V to 2.5V or 0V to –2.5V, and bipolar output of ±2.5V. The datasheet confirms operation down to ±4.5V analog supplies and shows INL/DNL curves referenced to 2.5V in Figures G14–G17, validating full 16-bit performance at reduced reference levels.
LTC1821BIGW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 36-BSOP (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 16
- Number of D/A Converters:
- 1
- Settling Time:
- 2µs (Typ)
- Output Type:
- Voltage - Buffered
- Differential Output:
- No
- Data Interface:
- Parallel
- Reference Type:
- External
- Voltage - Supply, Analog:
- ±4.5V ~ 16.5V
- Voltage - Supply, Digital:
- 5V
- INL/DNL (LSB):
- ±2 (Max), ±1 (Max)
- Architecture:
- R-2R
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 36-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1821BIGW#PBF FAQ
1.How can I place an order for LTC1821BIGW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1821BIGW#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 LTC1821BIGW#PBF reliable?
The price and inventory of LTC1821BIGW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1821BIGW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1821BIGW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1821BIGW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1821BIGW#PBF?
LTC1821BIGW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1821BIGW#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 LTC1821BIGW#PBF?
For technical support, including LTC1821BIGW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1821BIGW#PBF requirements.
6.How does Aetrix verify that LTC1821BIGW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1821BIGW#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 LTC1821BIGW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1821BIGW#PBF?
All LTC1821BIGW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1821BIGW#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 LTC1821BIGW#PBF part is unused and in its original packaging.
Return procedure for LTC1821BIGW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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