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Analog Devices Inc. LTC1099ACN#PBF
- Part No.:
- LTC1099ACN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1099ACN#PBF.pdf
- Description:
- IC ADC 8BIT FLASH 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,952
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Product details
Overview
LTC1099ACN#PBF from Analog Devices (formerly Linear Technology) is a high-speed, microprocessor-compatible 8-bit analog-to-digital converter with integrated sample-and-hold. It delivers 2.5 µs conversion time in both RD and WR/RD modes, supports 2.5 V/µs input slew rate, achieves ±0.75 LSB total unadjusted error, and operates from a single 5 V supply. It is used in real-time data acquisition systems requiring fast digitization of dynamic analog signals without external S/H circuitry.
For engineers reviewing the LTC1099ACN#PBF datasheet, LTC1099ACN#PBF pinout, LTC1099ACN#PBF application, or LTC1099ACN#PBF equivalent, key selection considerations include its internal S/H acquisition time (240 ns), aperture time (110 ns), three-state latched outputs, overflow flag for cascading, and TC pin for user-adjustable conversion timing - all critical for embedded control, test instrumentation, and digital signal preprocessing interfaces.
Technical Context
The LTC1099ACN#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 features 240 ns acquisition time and 2.5 V/µs tracking rate, enabling accurate digitization of high-slew-rate inputs up to 156 kHz full-scale sine waves.
Digital interface is edge-triggered and processor-agnostic: RD mode initiates conversion on falling RD edge (with CS low); WR/RD mode uses WR edge to start conversion and RD edge to read data. The INT output signals conversion completion, and OFL flags input overflow relative to REF+–REF– range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit, no missing codes - guarantees monotonic transfer function and deterministic code transitions across full input range. |
| Conversion Time | 2.5 µs (typical) in both RD and WR/RD modes - enables 384 kSPS sustained throughput with 700 ns inter-conversion delay. |
| Total Unadjusted Error | ±0.75 LSB (LTC1099A grade) - includes offset, gain, linearity, and hold-step errors; ensures accuracy without user trimming. |
| Slew Rate Support | 2.5 V/µs (internal S/H) - allows faithful digitization of signals with rapid transients, e.g., 5 VP-P at 156 kHz. |
| Supply Voltage | 4.75 V to 5.25 V - single 5 V rail operation compatible with TTL/CMOS logic and eliminates need for dual supplies. |
| Reference Input Range | REF– to REF+ (0 V to 5 V typical) - supports ratiometric or absolute scaling; full-scale voltage = REF+ – REF–. |
| Power Dissipation | 75 mW max (at VCC = 5 V) - enables use in thermally constrained industrial and portable systems without forced cooling. |
Pinout & Package
Package: 20-lead PDIP (N package), 0.300-inch wide, through-hole mounting. Pin pitch: 0.100 inch (2.54 mm), body width: 0.325 inch (8.255 mm).
| 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 within 240 ns acquisition window. |
| DB0–DB7 (2–5, 14–17) | Three-state digital outputs | LSB-to-MSB parallel data bus; active when CS and RD are low; Hi-Z otherwise - directly interfaces to 8-bit microprocessor data buses without bus transceivers. |
| WR/RDY (6) | Mode-dependent I/O | In WR/RD mode: input triggering conversion on falling edge; in RD mode: open-drain RDY output (requires pull-up) signaling conversion start/completion - simplifies handshake with 8080/Z80-style processors. |
| MODE (7) | Interface mode select | Connect to GND for RD mode (conversion triggered by RD); connect to VCC for WR/RD mode (WR starts, RD reads) - no internal pull-down; external bias required. |
| RD (8) | Read strobe / conversion trigger | Falling edge initiates conversion in RD mode; enables output drivers in both modes - synchronizes data capture with processor read cycle. |
| INT (9) | Interrupt output | Active-low open-drain signal asserting at conversion completion - used for interrupt-driven data retrieval or cascading timing coordination. |
| GND (10) | Analog/digital ground reference | Common return for analog inputs, reference, and digital logic - must be tied to clean ground plane separate from noisy digital returns per layout guidelines. |
| REF– (11), REF+ (12) | Reference voltage terminals | Define full-scale range (VREF = REF+ – REF–); internally connected via 3.2 kΩ resistor ladder - require low-impedance, low-noise source due to switching current demands. |
| CS (13) | Chip select | High disables all outputs (Hi-Z) and ignores inputs - enables multi-device sharing of data/address bus in system-level designs. |
| OFL (18) | Overflow indicator | Active-low signal when VIN > REF+ - enables automatic range extension via cascaded configuration (e.g., 9-bit resolution with second LTC1099). |
| TC (19) | Conversion time adjust | Voltage-controlled timing input; open-circuit = 2.5 µs; pull to VCC slows, pull to GND speeds conversion - supports trade-off between speed and SNR in noise-sensitive applications. |
| VCC (20) | Positive supply | 4.75 V to 5.25 V power rail; bypassing with 4.7 µF tantalum + 0.1 µF ceramic near pin is mandatory to suppress switching noise coupling into analog path. |
Key Features
| Feature | Design Value |
|---|---|
| Built-in sample-and-hold | Eliminates external S/H IC and associated layout complexity; 240 ns acquisition time ensures fidelity for signals up to 156 kHz. |
| Edge-sensitive timing interface | No external pulse shaping needed - direct connection to microprocessor control lines (RD, WR, CS) reduces BOM and PCB area. |
| Latched three-state outputs | Enables direct connection to multiplexed 8-bit data buses (e.g., TMS320C25, 8085) without bus contention or additional latch ICs. |
| User-adjustable conversion time | TC pin allows real-time optimization: slower conversion improves SNR (e.g., –48 dB at 10 kHz), faster preserves bandwidth for transient capture. |
| Overflow output (OFL) | Supports hardware-based range extension - cascading two LTC1099s yields 9-bit resolution with synchronized timing and no software overhead. |
Applications
| Industrial Data Acquisition | Embedded Motor Control Feedback |
|---|---|
Use Scenario: Digitizing analog sensor outputs (e.g., current shunt, position encoder, temperature RTD) in PLC I/O modules operating at 100–200 kSPS. IC Role / Device Role / Timing Role: Primary A/D front-end with integrated S/H, providing synchronized 8-bit samples to ARM Cortex-M4 controller via parallel bus. Use Value: 2.5 µs conversion time and 2.5 V/µs slew support enable accurate capture of motor phase currents during PWM switching edges without external anti-aliasing complexity. | Use Scenario: Real-time sampling of analog feedback signals (e.g., back-EMF, hall sensor outputs) in closed-loop servo drives with <10 µs control loop latency. IC Role / Device Role / Timing Role: High-speed ADC interfacing directly to DSP address/data bus in RD mode, with INT-driven interrupt service routine. Use Value: ±0.75 LSB accuracy and no missing codes ensure linear position estimation over full mechanical rotation, critical for field-oriented control precision. |
| Test & Measurement Instrumentation | Communications Signal Conditioning |
Use Scenario: Input stage of portable oscilloscope or spectrum analyzer capturing baseband waveforms up to 100 kHz with >45 dB SNR. IC Role / Device Role / Timing Role: Standalone A/D in SA mode (CS/RD tied low), driven by WR pulses from FPGA timing engine at programmable rates. Use Value: TC pin adjustment allows optimizing conversion time vs. SNR trade-off per measurement mode - e.g., 3.0 µs for high-fidelity audio band, 2.2 µs for transient glitch capture. | Use Scenario: Digitizing intermediate frequency (IF) signals in software-defined radio (SDR) receiver front-ends prior to digital down-conversion. IC Role / Device Role / Timing Role: Parallel-output ADC feeding FPGA FIFO, using WR/RD mode for deterministic pipeline depth control. Use Value: Overflow flag (OFL) enables automatic gain-ranging in AGC loops - detecting clipping triggers DAC reference update within same sample period. |
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 |
|---|---|---|---|
| MAX1110CCPP+ | 8-bit, 1 MSPS, SPI interface, no internal S/H, 2.7–5.25 V supply | Requires external S/H and serial interface logic; better suited for space-constrained, low-pin-count MCU designs | Select when board area is limited and microcontroller has SPI but lacks parallel bus; not drop-in due to interface and S/H omission. |
| ADS7822U | 8-bit, 200 kSPS, SPI interface, internal S/H, 2.7–5.25 V supply, 10-bit option available | Lower speed, serial-only interface, smaller SO-8 package; optimized for battery-powered portable instruments | Choose for ultra-low-power (<1.5 mW) handheld devices where 200 kSPS suffices and PCB real estate is premium. |
Compared with MAX1110CCPP+ and ADS7822U, the LTC1099ACN#PBF provides superior analog performance (2.5 µs conversion, ±0.75 LSB, built-in S/H) and direct parallel bus compatibility - making it optimal for legacy 8-bit MPU systems and high-fidelity real-time acquisition where timing determinism and minimal external components are critical.
Availability
LTC1099ACN#PBF is available at Aetrix Electronics and suitable for industrial data acquisition, embedded motor control feedback, and test & measurement instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for LTC1099ACN#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 LTC1099ACN#PBF belongs to Linear's legacy high-speed precision ADC product line, designed specifically for applications demanding fast, accurate digitization of dynamic analog signals in resource-constrained embedded systems without external support circuitry.
FAQ
What is the operating temperature range for the LTC1099ACN#PBF?
The LTC1099ACN#PBF is rated for 0°C to +70°C ambient operation. This commercial-grade temperature specification aligns with its N-package (20-lead PDIP) construction and targets non-automotive industrial and instrumentation applications where extended thermal range is not required. The 'A' grade denotes improved accuracy (±0.75 LSB) over the standard LTC1099C (±1 LSB), but both share identical thermal limits.
Does the LTC1099ACN#PBF require an external clock source?
No, the LTC1099ACN#PBF does not require an external clock. All timing is generated internally, including conversion sequencing and sample-and-hold control. The device uses edge-sensitive digital inputs (RD, WR, CS) to initiate operations, eliminating clock distribution, jitter concerns, and external oscillator components - simplifying system design and improving timing predictability.
How is the conversion time adjusted on the LTC1099ACN#PBF?
Conversion time on the LTC1099ACN#PBF is adjusted via the TC pin (Pin 19). With TC left open, nominal conversion time is 2.5 µs. Connecting TC to VCC increases conversion time (slower, higher SNR); connecting to GND decreases it (faster, lower SNR). A resistive divider between VCC and GND on TC allows fine-grained tuning - as shown in Figure 7 of the datasheet - enabling optimization for specific signal bandwidth and noise requirements.
Can the LTC1099ACN#PBF interface directly with a TMS320C25 DSP?
Yes, the LTC1099ACN#PBF interfaces directly with the TMS320C25 DSP using either RD or WR/RD mode. Application notes TA03 and TA04 provide verified assembly code examples: RD mode uses falling RD edge to trigger conversion and read data; WR/RD mode separates write (WR) and read (RD) phases. The three-state outputs and INT/WR/RDY handshaking signals match the C25's parallel bus timing requirements without glue logic.
What is the purpose of the OFL (overflow) pin on the LTC1099ACN#PBF?
The OFL (overflow) pin on the LTC1099ACN#PBF is an active-low output that asserts when the analog input voltage (VIN) exceeds the reference upper bound (REF+). This enables hardware-based range extension: cascading two LTC1099ACN#PBF devices allows 9-bit resolution by using the first device's OFL to gate the second device's conversion, eliminating software polling and ensuring synchronized, glitch-free extended-range digitization.
LTC1099ACN#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 20-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
LTC1099ACN#PBF FAQ
1.How can I place an order for LTC1099ACN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1099ACN#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 LTC1099ACN#PBF reliable?
The price and inventory of LTC1099ACN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1099ACN#PBF is usually 5 days.
3.What payment methods are accepted for LTC1099ACN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1099ACN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1099ACN#PBF?
LTC1099ACN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1099ACN#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 LTC1099ACN#PBF?
For technical support, including LTC1099ACN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1099ACN#PBF requirements.
6.How does Aetrix verify that LTC1099ACN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1099ACN#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 LTC1099ACN#PBF meets industry standards.
7.What is the process for return or replacement of LTC1099ACN#PBF?
All LTC1099ACN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1099ACN#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 LTC1099ACN#PBF part is unused and in its original packaging.
Return procedure for LTC1099ACN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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