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Analog Devices Inc. LTC1099CSW#PBF
- Part No.:
- LTC1099CSW#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
LTC1099CSW#PBF.pdf
- Description:
- IC ADC 8BIT FLASH 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,856
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Product details
Overview
LTC1099CSW#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. It is used in precision instrumentation, digital oscilloscopes, and embedded control loop sampling.
For engineers reviewing the LTC1099CSW#PBF datasheet, LTC1099CSW#PBF pinout, LTC1099CSW#PBF application, or LTC1099CSW#PBF equivalent, key selection considerations include its internal S/H acquisition time (240 ns), total unadjusted error (±1 LSB), TC pin programmability, 20-pin SOIC-W package compatibility, and support for standalone, RD, and WR/RD operation modes without external clock.
Technical Context
The LTC1099CSW#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 8-bit resolution. Its internal sample-and-hold has 110 ns aperture time and 240 ns acquisition time, enabling digitization of up to 156 kHz full-scale sine inputs without external hold circuitry.
Digital interface timing is fully edge-sensitive and internally generated: RD or WR falling edges trigger S/H hold and conversion start; INT asserts low upon completion; outputs update simultaneously after conversion. The TC pin allows user adjustment of conversion time via external resistor networks, supporting trade-offs between speed and accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits with no missing codes - guarantees monotonic transfer function and deterministic digital output mapping across full input range. |
| Conversion Time | 2.5 µs typical in both RD and WR/RD modes - enables 384 kSPS sustained throughput when interleaved with minimal dead time (700 ns min inter-conversion delay). |
| Total Unadjusted Error | ±1 LSB maximum - includes offset, gain, linearity, and hold-step errors; ensures absolute accuracy without factory calibration or trimming. |
| Slew Rate Support | 2.5 V/µs - matches internal S/H tracking capability, allowing direct digitization of fast-rising signals up to 156 kHz at 5 VP-P without signal distortion. |
| Supply Voltage | 4.75 V to 5.25 V - single 5 V rail operation simplifies power design and ensures compatibility with TTL/CMOS logic families. |
| Power Dissipation | 75 mW maximum at 5 V - enables use in thermally constrained industrial and portable systems without active cooling. |
| Reference Input Range | REF– to VCC - supports flexible scaling (e.g., 0–5 V, ±2.5 V) as long as REF+ > REF– and both remain within supply rails. |
Pinout & Package
Package: SW - 20-lead plastic small-outline (wide, 0.300 inch body width), RoHS-compliant, surface-mountable with standard reflow profile.
| 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) to avoid settling errors. |
| DB0–DB7 (2–5, 14–17) | Parallel digital output bus | LSB-to-MSB latched outputs with three-state control - directly connectable to 8-bit microprocessor data buses; high-impedance when CS = high or RD inactive. |
| WR/RDY (6) | Mode-dependent I/O | In WR/RD mode: WR input (edge-triggered conversion start); in RD mode: open-drain RDY output (requires pull-up) for processor-ready handshake. |
| MODE (7) | Interface mode select | Connect to VCC for WR/RD mode; connect to GND for RD mode - no internal pull-down, so external bias required. |
| RD (8) | Read strobe / conversion trigger | Falling edge initiates conversion in RD mode; enables output drivers when CS = low - synchronizes data capture with processor read cycle. |
| INT (9) | Interrupt output | Active-low open-drain flag signaling conversion completion - used to generate CPU interrupt or enable data latch in external logic. |
| GND (10) | Analog ground reference | Primary ground return for analog section - must be tied to clean ground plane separate from digital noise sources per layout guidelines. |
| REF– (11), REF+ (12) | Reference voltage terminals | Define full-scale range (VREF = REF+ − REF−); internal 3.2 kΩ resistive ladder - requires low-impedance, low-noise reference source. |
| CS (13) | Chip select | High disables all outputs and ignores inputs - enables multi-device sharing of data/address bus without contention. |
| OFL (18) | Overflow indicator | Active-low signal asserted when VIN > VREF - used for range checking or cascading multiple LTC1099 devices for extended resolution (e.g., 9-bit). |
| TC (19) | Conversion time adjust | Analog voltage input controlling internal timing - open-circuit = 2.5 µs; resistor to VCC slows conversion; resistor to GND speeds it up. |
| VCC (20) | Positive supply | 4.75–5.25 V power rail - bypassing with 4.7 µF tantalum + 0.1 µF ceramic near pin is mandatory for SNR performance. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in sample-and-hold | Eliminates need for external S/H circuitry; 240 ns acquisition time and 2.5 V/µs tracking rate support wideband signal digitization. |
| Three operating modes | RD mode (processor-controlled), WR/RD mode (separate write/read), and Stand-Alone mode (CS/RD held low) - adapts to diverse system architectures. |
| User-adjustable conversion time | TC pin enables fine-tuning of conversion speed vs. accuracy trade-off via external resistor - supports optimization for specific signal bandwidths. |
| Overflow output (OFL) | Enables daisy-chaining multiple LTC1099 units to achieve higher resolution (e.g., 9-bit) without external logic or FPGA resources. |
| No missing codes & no user trims | Guaranteed monotonicity and ±1 LSB total unadjusted error eliminate post-manufacture calibration - reduces test time and BOM cost. |
| Edge-sensitive timing | All digital inputs respond to signal edges only - removes dependency on pulse width or external timing circuits, simplifying MCU firmware. |
Applications
| Industrial Data Acquisition | Digital Oscilloscope Front-End |
|---|---|
|
Use Scenario: Real-time monitoring of motor current, temperature, and vibration in PLC-based control cabinets with 100+ channel scan rates. IC Role / Device Role / Timing Role: Primary A/D converter capturing analog sensor outputs at up to 384 kSPS with deterministic 2.5 µs latency per sample. Use Value: Internal S/H eliminates external hold circuitry; ±1 LSB error ensures calibrated measurement traceability; 20-pin SOIC-W eases board space constraints in dense I/O modules. |
Use Scenario: Digitizing analog waveforms in portable handheld oscilloscopes requiring sub-microsecond sampling jitter and battery-efficient operation. IC Role / Device Role / Timing Role: High-fidelity front-end ADC providing 8-bit resolution at 156 kHz full-scale bandwidth with minimal aperture uncertainty (110 ns). Use Value: Single 5 V supply reduces power stage complexity; 75 mW max dissipation extends battery life; TC pin allows dynamic speed adjustment during deep-memory capture modes. |
| Embedded Control Loop Sampling | Analog Signal Multiplier System |
|
Use Scenario: Closed-loop feedback sampling in servo drives where analog position/velocity signals must be converted synchronously with PWM switching cycles. IC Role / Device Role / Timing Role: Timing-critical ADC triggered by processor RD strobe in tight synchronization with control algorithm execution. Use Value: RD mode's edge-triggered conversion and INT flag enable precise deterministic sampling windows; latched outputs prevent bus contention during computation. |
Use Scenario: Two-quadrant analog multiplication in RF modulation circuits, combining baseband and carrier signals for AM generation. IC Role / Device Role / Timing Role: High-speed digitizer feeding real-time DAC in flow-through configuration to produce amplitude-modulated output. Use Value: 2.5 µs conversion enables 300 kHz effective modulation rate; OFL flag detects clipping during dynamic range compression; REF+/- flexibility supports bipolar input scaling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC1406CMS8#PBF | 20 MSPS vs. 384 kSPS; 48.5 dB SINAD vs. ~46 dB SNR at 10 kHz; requires external S/H; 5 V only. | Targets video or IF sampling, not general-purpose data acquisition; higher speed demands more aggressive layout and decoupling. | Select LTC1406 only when >1 MSPS throughput is mandatory; LTC1099CSW#PBF remains superior for <500 kSPS with integrated S/H and simpler interface. |
| MAX1186EEE+ | 8-bit, 1 MSPS; internal reference; SPI interface; no OFL or TC pin; ±0.5 LSB INL; 3.3 V or 5 V operation. | Designed for compact microcontroller-peripheral integration; lacks parallel bus and overflow cascade capability. | Choose MAX1186 for space-constrained, low-pin-count designs with SPI host; LTC1099CSW#PBF preferred for legacy 8-bit bus systems and multi-ADC cascading. |
Compared with LTC1406CMS8#PBF and MAX1186EEE+, the LTC1099CSW#PBF uniquely balances integrated S/H, parallel bus simplicity, overflow-enabled resolution extension, and user-adjustable timing - making it optimal for industrial DAQ and embedded control where ease of interface and deterministic latency outweigh raw speed.
Availability
LTC1099CSW#PBF is available at Aetrix Electronics and suitable for industrial data acquisition, embedded control loop sampling, and digital oscilloscope front-end designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LTC1099CSW#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 LTC1099CSW#PBF belongs to Linear's legacy high-speed precision ADC product line, engineered specifically for microprocessor-centric data acquisition systems demanding integrated S/H, deterministic timing, and minimal external components.
FAQ
What is the operating temperature range for the LTC1099CSW#PBF?
The LTC1099CSW#PBF is specified for commercial temperature operation from 0°C to 70°C. This range is confirmed in the Absolute Maximum Ratings table and applies to all DC and AC specifications unless otherwise noted. The device uses the "C" grade suffix, distinguishing it from the "I" grade (–40°C to +85°C) and "A" grade (improved accuracy) variants. Thermal derating begins above 70°C ambient.
Does the LTC1099CSW#PBF require an external clock source?
No, the LTC1099CSW#PBF 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). The TC pin allows analog adjustment of conversion time, but no clock signal is needed for basic operation in RD, WR/RD, or Stand-Alone modes.
How is the overflow output (OFL) used in cascaded configurations with the LTC1099CSW#PBF?
The OFL pin of the LTC1099CSW#PBF goes low when VIN exceeds VREF, indicating saturation. In cascaded 9-bit configurations, the OFL output of the first LTC1099CSW#PBF drives the MODE or CS input of a second unit to enable extended-range conversion. Figure 15 in the datasheet shows this topology, where the MSB of the combined result is derived from the OFL state, and the remaining 8 bits come from the second device's DB0–DB7.
Can the LTC1099CSW#PBF operate with a 3.3 V supply?
No, the LTC1099CSW#PBF is specified only for 4.75 V to 5.25 V operation. Its internal reference ladder, comparator thresholds, and output drive strength are designed for 5 V logic compatibility. Supplying 3.3 V will result in undefined behavior, failure to meet timing specs (e.g., tCRD), and potential damage if referenced inputs exceed the reduced VCC. For 3.3 V systems, consider alternatives like the MAX1186EEE+.
What is the significance of the TC pin on the LTC1099CSW#PBF?
TC (Pin 19) on the LTC1099CSW#PBF is an analog input that adjusts internal conversion timing. With TC open, conversion time is 2.5 µs. Connecting TC to VCC via resistor slows conversion (up to ~5 µs); connecting to GND speeds it (down to ~1.5 µs). This allows designers to optimize speed vs. accuracy (e.g., lower TC voltage improves SNR at cost of throughput) without changing hardware layout.
LTC1099CSW#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1099CSW#PBF FAQ
1.How can I place an order for LTC1099CSW#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1099CSW#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 LTC1099CSW#PBF reliable?
The price and inventory of LTC1099CSW#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1099CSW#PBF is usually 5 days.
3.What payment methods are accepted for LTC1099CSW#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1099CSW#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1099CSW#PBF?
LTC1099CSW#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1099CSW#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 LTC1099CSW#PBF?
For technical support, including LTC1099CSW#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1099CSW#PBF requirements.
6.How does Aetrix verify that LTC1099CSW#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1099CSW#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 LTC1099CSW#PBF meets industry standards.
7.What is the process for return or replacement of LTC1099CSW#PBF?
All LTC1099CSW#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1099CSW#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 LTC1099CSW#PBF part is unused and in its original packaging.
Return procedure for LTC1099CSW#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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