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Analog Devices Inc. LTC1099AIN#PBF
- Part No.:
- LTC1099AIN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1099AIN#PBF.pdf
- Description:
- IC ADC 8BIT FLASH 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,816
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Product details
Overview
LTC1099AIN#PBF from Analog Devices (formerly Linear Technology) is a high-speed 8-bit analog-to-digital converter with integrated sample-and-hold, designed for microprocessor interfacing in real-time data acquisition systems. It delivers 2.5 µs conversion time in both RD and WR/RD modes, supports 2.5 V/µs input slew rate, operates from a single 5 V supply, and features latched three-state outputs with overflow flag for cascading - enabling digitization of 156 kHz full-scale sine waves without external S/H.
For engineers reviewing the LTC1099AIN#PBF datasheet, LTC1099AIN#PBF pinout, LTC1099AIN#PBF application, or LTC1099AIN#PBF equivalent, key selection considerations include its ±0.75 LSB total unadjusted error (A-grade), –40°C to +85°C industrial temperature range, user-adjustable conversion time via TC pin, and compatibility with 8-bit parallel bus interfaces using RD/WR edge-sensitive timing.
Technical Context
The LTC1099AIN#PBF implements a 2-step semi-flash ADC architecture using dual 4-bit flash converters and a shared switched-capacitor comparator, reducing comparator count to 16 while maintaining monotonicity and no missing codes. Its internal sample-and-hold has 240 ns acquisition time, 110 ns aperture time, and 2.5 V/µs tracking rate - all specified over the full –40°C to +85°C range.
Digital interface supports three operational modes: RD mode (conversion triggered by falling RD edge), WR/RD mode (WR initiates conversion, RD reads data), and Stand-Alone mode (CS and RD held low). All timing is internally generated and edge-sensitive, eliminating need for external clocks or pulse-shaping circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit with no missing codes - guarantees monotonic transfer function for precision measurement. |
| Conversion Time | 2.5 µs typ (RD & WR/RD modes) - enables sampling up to 156 kHz Nyquist-limited signals. |
| Total Unadjusted Error | ±0.75 LSB (LTC1099A grade) - includes offset, gain, linearity, and hold step errors over full temp range. |
| Slew Rate Support | 2.5 V/µs - allows accurate digitization of fast-rising inputs without external S/H. |
| Supply Voltage | 4.75 V to 5.25 V - single 5 V rail operation compatible with TTL/CMOS logic levels. |
| Power Dissipation | 75 mW max - low power enables use in thermally constrained industrial modules. |
| Reference Input Range | REF– to VCC (0 V to 5 V typical) - supports flexible scaling including unipolar 0–5 V or bipolar configurations. |
Pinout & Package
Package: 20-lead 0.3" wide plastic DIP (N package), industry-standard through-hole mounting with 2.54 mm pitch, suitable for prototyping and legacy industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Analog input | High-impedance node with 60 pF capacitance and 550 Ω series resistance - requires low-output-impedance driver (e.g., LT1006) for settling. |
| DB0–DB7 (2–5, 14–17) | Parallel digital output | Latched three-state outputs (DB0 = LSB, DB7 = MSB); active low CS and RD enable bus sharing. |
| WR/RDY (6) | Mode-dependent I/O | In WR/RD mode: input triggering conversion on falling edge; in RD mode: open-drain RDY output requiring pull-up. |
| MODE (7) | Interface mode select | Connect to GND for RD mode; connect to VCC for WR/RD mode - no internal pull-down. |
| RD (8) | Read strobe / conversion trigger | Falling edge initiates conversion in RD mode; enables output drivers when CS is low. |
| INT (9) | Interrupt output | Active-low open-drain signal indicating conversion completion and data validity. |
| GND (10) | Analog ground reference | Primary ground return; must be tied to clean analog ground plane separate from digital noise sources. |
| REF– (11) | Low reference terminal | Analog ground reference for differential reference input; tied to system AGND in unipolar applications. |
| REF+ (12) | High reference terminal | Sets full-scale range (VREF = REF+ – REF–); drives internal 3.2 kΩ resistor ladder. |
| CS (13) | Chip select | High disables outputs and ignores all inputs - essential for multi-device bus arbitration. |
| OFL (18) | Overflow flag | Active-low output asserting when VIN > VREF - enables cascading for extended resolution (e.g., 9-bit). |
| TC (19) | Conversion time adjust | Voltage-controlled pin; open circuit = 2.5 µs; tie to VCC or GND to slow/speed conversion per Figure 7. |
| VCC (20) | Positive supply | 4.75–5.25 V supply with bypassing required (4.7 µF tantalum + 0.1 µF ceramic near pin). |
Key Features
| Feature | Design Value |
|---|---|
| Built-in sample-and-hold | Eliminates external S/H circuitry; 240 ns acquisition and 2.5 V/µs tracking support high-frequency inputs. |
| Edge-sensitive digital interface | No external clock or timing logic needed - RD/WR falling edges directly control conversion and data read. |
| User-adjustable conversion time | TC pin allows fine-tuning from ~1.6 µs to >3.75 µs via external resistor network - balances speed vs. accuracy. |
| Overflow output (OFL) | Enables hardware cascading of two LTC1099AIN#PBF units for 9-bit resolution without software overhead. |
| Industrial temperature grade | Specified over –40°C to +85°C with guaranteed ±0.75 LSB error - suitable for embedded industrial controllers. |
Applications
| Real-Time Motor Control Feedback | Industrial Data Acquisition System |
|---|---|
Use Scenario: Sampling current/voltage feedback from motor phase windings at ≥100 kHz for closed-loop PWM control in servo drives. IC Role / Device Role / Timing Role: High-speed 8-bit ADC with integrated S/H captures transient waveforms without aliasing; 2.5 µs conversion ensures minimal control loop latency. Use Value: Enables precise torque and position regulation in brushless DC and stepper motor systems operating across –40°C to +85°C ambient. | Use Scenario: Digitizing sensor outputs (pressure, temperature, strain) in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Parallel-output ADC interfaced to microcontroller via 8-bit bus; RD/WR modes simplify firmware integration with minimal GPIO usage. Use Value: Reduces BOM cost and board space by eliminating external S/H and clock generation components while meeting industrial accuracy requirements. |
| Test & Measurement Equipment | Two-Quadrant Analog Multiplier |
Use Scenario: Front-end digitization in portable oscilloscopes and waveform analyzers requiring 156 kHz effective sampling bandwidth. IC Role / Device Role / Timing Role: ADC with 2.5 V/µs slew rate support captures fast transients; SNR >40 dB at 10 kHz enables clean spectral analysis. Use Value: Provides sufficient dynamic range for mid-tier bench instruments without requiring higher-cost 10–12 bit alternatives. | Use Scenario: Building amplitude modulation (AM) signal generators by multiplying analog input (LTC1099AIN#PBF) with DAC reference (MP1208). IC Role / Device Role / Timing Role: Digitizes carrier waveform at 300 kHz; latched outputs feed DAC in flow-through mode for real-time multiplication. Use Value: Achieves >30 dB modulation depth at RF frequencies (e.g., 42 kHz × 30 kHz) using only two ICs and passive components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit parallel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1112ACPP+ | 8-bit, 250 ksps, SPI interface, ±5 V supply, no integrated S/H - requires external op-amp and S/H. | Not pin-compatible; serial interface increases MCU GPIO burden and adds timing complexity. | Select when board space is constrained and SPI interface is preferred over parallel bus. |
| AD7820KNZ | 8-bit, 1.25 µs conversion, CMOS process, single 5 V supply, no integrated S/H - higher speed but needs external S/H for >100 kHz inputs. | Higher speed but lacks built-in S/H; requires additional components for high-slew-rate inputs. | Select when maximum throughput (>750 ksps) is critical and external S/H design is acceptable. |
Compared with MAX1112ACPP+ and AD7820KNZ, the LTC1099AIN#PBF uniquely integrates sample-and-hold and supports true 156 kHz Nyquist-limited sampling with zero external timing components - making it optimal for cost-sensitive, space-constrained industrial designs where parallel bus simplicity and analog front-end integration are prioritized.
Availability
LTC1099AIN#PBF is available at Aetrix Electronics and suitable for real-time motor control feedback, industrial data acquisition systems, test & measurement equipment, and analog signal processing applications requiring stable component supply and long-term obsolescence management.
Supply support for LTC1099AIN#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 LTC1099AIN#PBF belongs to Linear's legacy high-speed precision ADC product line, engineered specifically for industrial and instrumentation applications demanding integrated analog front-ends, robust temperature performance, and microprocessor-friendly parallel interfaces.
FAQ
What is the operating temperature range for the LTC1099AIN#PBF?
The LTC1099AIN#PBF is rated for operation from –40°C to +85°C, qualifying it for industrial environments. This "I" grade variant guarantees ±0.75 LSB total unadjusted error across the full temperature range, unlike the "C" grade (0°C to 70°C) which specifies ±0.75 LSB only at 25°C. Thermal derating of conversion time and supply current is documented in Figures G01 and G07 of the datasheet.
How does the TC pin on the LTC1099AIN#PBF affect conversion time?
The TC pin on the LTC1099AIN#PBF allows user adjustment of conversion time from approximately 1.6 µs to over 3.75 µs. With TC left open, conversion time is 2.5 µs. Tying TC to VCC slows conversion; tying to GND speeds it up - per the REXT vs. conversion time curve in Figure G05. This feature enables trade-offs between speed and accuracy in noise-sensitive applications.
Can the LTC1099AIN#PBF interface directly with a TMS320C25 DSP?
Yes, the LTC1099AIN#PBF is explicitly supported for interface with the TMS320C25 DSP using either RD or WR/RD mode. Application notes TA03 and TA04 provide verified assembly code examples, timing diagrams, and schematic layouts - including READY signal connection to the DSP's RDYIN pin for automatic bus cycle stretching during conversion.
What is the purpose of the OFL (overflow) output on the LTC1099AIN#PBF?
The OFL output on the LTC1099AIN#PBF is an active-low signal that asserts when the analog input voltage exceeds the reference voltage (VIN > VREF). Its primary design purpose is to enable hardware cascading of two LTC1099AIN#PBF units for 9-bit resolution - where the OFL of the first stage controls the MSB of the second stage, eliminating software-based overflow handling.
Does the LTC1099AIN#PBF require an external clock source?
No, the LTC1099AIN#PBF requires no external clock. All timing is generated internally and triggered by edge-sensitive digital inputs (RD or WR falling edges). This eliminates clock distribution noise, simplifies layout, and removes dependency on external oscillator stability - a key advantage for EMI-sensitive industrial applications.
LTC1099AIN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1099AIN#PBF FAQ
1.How can I place an order for LTC1099AIN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1099AIN#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 LTC1099AIN#PBF reliable?
The price and inventory of LTC1099AIN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1099AIN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1099AIN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1099AIN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1099AIN#PBF?
LTC1099AIN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1099AIN#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 LTC1099AIN#PBF?
For technical support, including LTC1099AIN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1099AIN#PBF requirements.
6.How does Aetrix verify that LTC1099AIN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1099AIN#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 LTC1099AIN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1099AIN#PBF?
All LTC1099AIN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1099AIN#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 LTC1099AIN#PBF part is unused and in its original packaging.
Return procedure for LTC1099AIN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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