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Analog Devices Inc. LTC1099CSW#TRPBF
- Part No.:
- LTC1099CSW#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1099CSW#TRPBF.pdf
- Description:
- IC ADC 8BIT FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,251
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Product details
Overview
LTC1099CSW#TRPBF 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. It is used in precision instrumentation, digital oscilloscopes, and embedded control feedback loops.
For engineers reviewing the LTC1099CSW#TRPBF datasheet, LTC1099CSW#TRPBF pinout, LTC1099CSW#TRPBF application, or LTC1099CSW#TRPBF equivalent, key selection considerations include its internal S/H acquisition time (240 ns), total unadjusted error (±1 LSB), TC pin-adjustable conversion timing, stand-alone operation capability, and compatibility with 5 V TTL/CMOS logic levels without external clocking.
Technical Context
The LTC1099CSW#TRPBF 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 110 ns aperture time and 240 ns acquisition time, enabling full-Nyquist digitization of up to 156 kHz 5 VP-P signals.
Digital interface supports three operational modes: RD mode (conversion triggered by RD↓), WR/RD mode (WR↓ initiates conversion, RD↓ reads data), and Stand-Alone mode (CS/RD held low). All timing is edge-sensitive and internally generated - eliminating need for external pulse shaping or clock distribution circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit, guaranteed no missing codes across full temperature range |
| Conversion Time | 2.5 µs typical (RD or WR/RD mode); enables 156 kHz full-scale sine wave sampling |
| Total Unadjusted Error | ±1 LSB max (LTC1099 grade), includes offset, gain, linearity, and hold step errors |
| Slew Rate Support | 2.5 V/µs - determined by internal S/H tracking rate, not external driver limitation |
| Supply Voltage | 4.75 V to 5.25 V - single 5 V rail; ICC ≤ 20 mA at VCC = 5 V |
| Reference Input Range | REF– to REF+; supports 1 V to 5 V full-scale span (REF+ – REF–) |
| Operating Temp | 0°C to 70°C (C-grade), validated over full range per G-specified parameters |
Pinout & Package
Package: SW - 20-lead plastic wide-body SOIC (0.300" width), RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Analog input | High-impedance node with 60 pF capacitance and 550 Ω series resistance; requires low-Z, fast-settling driver |
| DB0–DB7 (2–5, 14–17) | Parallel digital output | 8-bit latched, three-state outputs (LSB DB0 to MSB DB7); active low CS disables outputs |
| WR/RDY (6) | Mode-dependent I/O | In WR/RD mode: WR input (edge-triggered); in RD mode: open-drain RDY output (requires pull-up) |
| MODE (7) | Interface configuration | Connect to VCC for WR/RD mode; connect to GND for RD mode; no internal pull-down |
| RD (8) | Read strobe / conversion trigger | Falling edge initiates conversion in RD mode; enables output drivers when CS 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 ground |
| REF– (11), REF+ (12) | Reference terminals | Define full-scale range (VREF = REF+ – REF–); internal 3.2 kΩ resistor ladder between them |
| CS (13) | Chip select | High = outputs in Hi-Z, all inputs ignored; essential for bus sharing in multi-device systems |
| OFL (18) | Overflow indicator | Active-low flag signaling VIN > VREF; enables cascading for extended resolution (e.g., 9-bit via second device) |
| TC (19) | Timing control | Analog voltage input to adjust conversion time; open = 2.5 µs; tie to VCC/GND to slow/speed up |
| VCC (20) | Positive supply | 4.75 V to 5.25 V; requires local 4.7 µF tantalum + 0.1 µF ceramic bypassing per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Built-in sample-and-hold | Eliminates external S/H circuitry; 240 ns acquisition time and 2.5 V/µs tracking rate enable direct sensor or amplifier interface |
| Edge-sensitive digital interface | No external clock or timing logic required; RD/WR edges directly control conversion start and data read, simplifying µP firmware |
| User-adjustable conversion time | TC pin accepts analog voltage to scale conversion time from <2.5 µs to >2.5 µs - enables trade-off between speed and power/noise |
| Cascadable overflow output | OFL pin allows daisy-chaining multiple LTC1099CSW#TRPBF units to build higher-resolution systems (e.g., 9-bit or 10-bit) without external logic |
| Single-supply 5 V operation | Compatible with standard TTL/CMOS logic families; eliminates need for ±15 V supplies common in legacy ADCs |
Applications
| Instrumentation Data Acquisition | Digital Oscilloscope Front-End |
|---|---|
Use Scenario: Digitizing sensor outputs (e.g., strain gauge, thermocouple amplifiers) in portable test equipment with µP-based storage and display. IC Role / Device Role / Timing Role: Primary A/D converter capturing DC–156 kHz signals with minimal external components; INT and OFL support automated range scaling and overflow detection. Use Value: Internal S/H and ±1 LSB accuracy eliminate calibration overhead; 2.5 µs conversion enables real-time waveform capture at 400 kSPS effective rate in burst mode. | Use Scenario: Sampling analog input channels in benchtop or embedded digital storage oscilloscopes requiring sub-microsecond timing resolution. IC Role / Device Role / Timing Role: High-fidelity front-end digitizer synchronized to trigger events via RD/WR edge control; TC pin tunes conversion time to match memory depth requirements. Use Value: 240 ns acquisition time and 110 ns aperture uncertainty ensure accurate time-domain reconstruction; latched outputs interface directly to FIFO or SRAM without glue logic. |
| Embedded Motor Control Feedback | Analog Multiplier Systems |
Use Scenario: Closed-loop current/voltage sensing in industrial servo drives where ADC latency impacts PID loop stability. IC Role / Device Role / Timing Role: Real-time analog feedback digitizer operating in Stand-Alone mode (CS/RD low); OFL monitors overcurrent events for immediate fault shutdown. Use Value: 2.5 µs deterministic conversion time ensures predictable control loop delay; single 5 V supply reduces board-level power complexity versus ±12 V alternatives. | Use Scenario: Two-quadrant analog multiplication in RF modulation circuits (e.g., AM generation) using LTC1099CSW#TRPBF + DAC pair. IC Role / Device Role / Timing Role: High-speed digitizer feeding real-time digital processing path; WR/RD mode enables precise interleave timing with DAC update clocks. Use Value: Simultaneous 8-bit output update and S/H re-acquisition after conversion avoids pipeline gaps; 60 pF input capacitance matched to LT1006 driver ensures <0.5 LSB settling error at 300 kHz sampling. |
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, 1.5 µs conversion, SPI interface, internal reference; no built-in S/H | Requires external S/H for >100 kHz signals; serial interface reduces pin count but increases µP overhead | Select when board space is constrained and µP supports SPI; avoid if full-Nyquist analog bandwidth or parallel bus timing is required |
| AD7823BN | 8-bit, 1.6 µs conversion, 5 V supply, no internal S/H, CMOS-compatible I/O | Higher power (15 mW vs 75 mW), lacks OFL and TC pins; requires external S/H and reference buffer | Prefer for low-power battery-operated systems where conversion speed suffices and external S/H is already present |
Compared with MAX1112ACPP+ and AD7823BN, the LTC1099CSW#TRPBF uniquely integrates sample-and-hold, overflow flag, and user-adjustable timing in a parallel-output 5 V package - making it optimal for µP-based systems needing deterministic latency, full-Nyquist fidelity, and minimal external components.
Availability
LTC1099CSW#TRPBF is available at Aetrix Electronics and suitable for instrumentation data acquisition, digital oscilloscope front-ends, and embedded motor control feedback systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1099CSW#TRPBF 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 and maintains full technical and manufacturing continuity for legacy Linear products including the LTC1099 family.
The LTC1099CSW#TRPBF belongs to Linear's precision high-speed ADC product line, engineered for applications demanding low-latency, single-supply operation, and integration simplicity - especially where microprocessor interfacing and real-time signal fidelity are critical.
FAQ
What is the maximum input frequency the LTC1099CSW#TRPBF can accurately digitize?
The LTC1099CSW#TRPBF supports full-Nyquist operation up to 156 kHz for 5 VP-P sine waves, based on its 2.5 µs conversion time and internal sample-and-hold with 2.5 V/µs slew rate. Signal-to-noise ratio degrades above ~50 kHz per Figure G08, but usable digitization extends to the Nyquist limit when aperture uncertainty (110 ns) and acquisition time (240 ns) are properly managed in layout and driver design.
Does the LTC1099CSW#TRPBF require an external clock source?
No, the LTC1099CSW#TRPBF does not require an external clock. All timing-including conversion initiation, S/H control, and output latching-is generated internally and triggered by edge-sensitive digital inputs (RD or WR). This eliminates clock distribution noise and simplifies system timing architecture compared to externally clocked ADCs.
How is the conversion time adjusted on the LTC1099CSW#TRPBF?
Conversion time on the LTC1099CSW#TRPBF is adjusted via the TC pin (Pin 19). Leaving TC open yields the default 2.5 µs conversion time. Connecting TC to VCC slows conversion; connecting to GND speeds it up. The relationship is monotonic and characterized in Figure G05 - allowing precise tuning for specific speed/power/noise trade-offs without changing hardware layout.
Can the LTC1099CSW#TRPBF operate without a microprocessor?
Yes, the LTC1099CSW#TRPBF supports Stand-Alone (SA) mode: tie CS and RD low, then apply WR pulses to initiate conversions. Outputs remain continuously active (no Hi-Z state), and new data appears on DB0–DB7 immediately after each conversion completes. This enables use in simple data loggers, analog monitors, or trigger-based acquisition systems without µP firmware.
What is the purpose of the OFL pin on the LTC1099CSW#TRPBF?
The OFL (Overflow) pin on the LTC1099CSW#TRPBF is an active-low output that asserts when VIN exceeds the reference voltage (VREF = REF+ – REF–). It enables cascading multiple LTC1099CSW#TRPBF devices to extend resolution - e.g., using OFL from the first device to enable a second device for MSB extension, achieving 9-bit or higher effective resolution without external comparators or logic.
LTC1099CSW#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1099CSW#TRPBF FAQ
1.How can I place an order for LTC1099CSW#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1099CSW#TRPBF 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 LTC1099CSW#TRPBF reliable?
The price and inventory of LTC1099CSW#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1099CSW#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC1099CSW#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1099CSW#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1099CSW#TRPBF?
LTC1099CSW#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1099CSW#TRPBF 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 LTC1099CSW#TRPBF?
For technical support, including LTC1099CSW#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1099CSW#TRPBF requirements.
6.How does Aetrix verify that LTC1099CSW#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC1099CSW#TRPBF 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 LTC1099CSW#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC1099CSW#TRPBF?
All LTC1099CSW#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1099CSW#TRPBF, 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 LTC1099CSW#TRPBF part is unused and in its original packaging.
Return procedure for LTC1099CSW#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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