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Analog Devices Inc. DC1255A-B
- Part No.:
- DC1255A-B
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1255A-B.pdf
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- EVAL BOARDS FOR LTC1606
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Product details
Overview
LTC1606 from Analog Devices (formerly Linear Technology) is a 16-bit, 250ksps successive-approximation ADC with ±10V bipolar input range, internal 2.5V reference and 4.096V buffered CAP output, operating from a single 5V supply. It delivers 90dB SNR, ±2.0LSB INL max, and guaranteed no missing codes over temperature - deployed in industrial process control and high-speed PC-based data acquisition systems.
For engineers reviewing the LTC1606 datasheet, LTC1606 pinout, LTC1606 application, or LTC1606 equivalent, this page provides verified technical context, real-world timing behavior, package-specific layout guidance, and validated alternative options for precision analog-to-digital conversion at 250kSPS with ±10V input compliance.
Technical Context
The LTC1606 integrates a 16-bit capacitive DAC, auto-zeroed comparator, and internal synchronized clock to execute full 16-bit conversions in 2.5µs with 1.5µs acquisition time. Its switched-capacitor SAR architecture uses internal zeroing switches and a precision bandgap reference trimmed to 2.500V ±3mV over temperature.
It supports two parallel output modes (16-bit word or byte-swapped 8+8) via BYTE control, with BUSY-driven status signaling and three-state outputs enabled by CS/R/C logic. Input overvoltage protection extends to ±25V, and analog input impedance is 10kΩ with 10pF capacitance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes with guaranteed no missing codes across full temperature range. |
| Sampling Rate | 250ksps - enables real-time capture of signals up to 125kHz Nyquist bandwidth with full 16-bit accuracy. |
| Input Range | ±10V bipolar - matches standard industrial sensor outputs and PLC I/O without external level-shifting. |
| Signal-to-Noise Ratio | 90dB typical - corresponds to ~15.0 effective bits (ENOB) at 1kHz, exceeding competing 16-bit ADCs by 3dB. |
| Integral Nonlinearity | ±2.0LSB maximum - ensures monotonicity and <0.003% full-scale error for precision measurement applications. |
| Power Dissipation | 75mW typical at 5V - enables low-thermal-drift operation in dense PCB layouts without forced cooling. |
| Reference Output | 2.500V ±3mV (±1.2ppm/°C drift) - factory-trimmed bandgap source usable as system reference or for external calibration. |
Pinout & Package
Available in 28-pin SSOP (G package) and 28-pin SO (SW package), both RoHS-compliant plastic surface-mount packages with 0.025" lead pitch (SSOP) or 0.050" lead pitch (SO). Thermal resistance θJA is 95°C/W (SSOP) and 130°C/W (SO).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1) | Analog Input | ±10V differential input node; requires 200Ω series resistor and local 1000pF NPO capacitor for optimal noise immunity. |
| AGND1 (2), AGND2 (5) | Analog Ground | Separate analog return paths - must be tied to low-impedance analog ground plane, not shared with digital ground. |
| REF (3) | 2.5V Reference Output | Factory-trimmed bandgap voltage; bypass with 2.2µF tantalum to suppress reference noise and improve DC stability. |
| CAP (4) | 4.096V Buffered Reference Output | 1.64× amplified REF output driving internal DAC; bypass with 10µF tantalum; limited to <2mA DC load. |
| D15–D0 (6–13, 15–22) | Three-State Parallel Data Outputs | 16-bit two's complement output bus; Hi-Z when CS high or R/C low - enables direct connection to microprocessor data buses. |
| R/C (24) | Read/Convert Control | Falling edge initiates conversion when CS is low; rising edge enables output data - defines core timing sequence. |
| CS (25) | Chip Select | Active-low enable; internally OR'd with R/C - allows flexible interface to FIFOs, DSPs, or microcontrollers with minimal glue logic. |
| BUSY (26) | Conversion Status Indicator | Active-low open-drain signal; goes high at end of conversion to indicate valid data - critical for synchronous read timing. |
| VANA (27), VDIG (28) | Analog/Digital Supplies | Both require 4.75V–5.25V; VANA powers analog circuitry, VDIG powers digital logic - must be decoupled independently with 0.1µF + 10µF. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Synchronized Clock | Eliminates need for external clock generation or trimming - ensures consistent 250ksps throughput without jitter-sensitive components. |
| ±25V Input Overvoltage Protection | Prevents latch-up or damage during transient surges common in industrial field wiring - no external clamping diodes required. |
| Two-Byte Output Mode (BYTE pin) | Enables 8-bit microcontroller interfacing without data-width translation logic - reduces BOM count and PCB area in cost-sensitive designs. |
| Trimmed Internal Reference (2.500V ±3mV) | Reduces system-level calibration effort - eliminates need for external reference IC unless sub-0.1% absolute accuracy is required. |
| Low Transition Noise (0.65LSB RMS) | Minimizes code flicker in DC or low-frequency measurements - improves repeatability in weigh scales and precision instrumentation. |
Applications
| Industrial Process Monitoring | PC-Based High-Speed DAQ |
|---|---|
Use Scenario: Continuous monitoring of 4–20mA current loops, thermocouple outputs, and strain gauge bridges in chemical plant control cabinets. IC Role / Device Role / Timing Role: Primary 16-bit ADC digitizing ±10V sensor outputs at 250ksps with synchronized BUSY-driven data capture into FPGA-based acquisition buffers. Use Value: ±2.0LSB INL and 90dB SNR ensure <0.003% measurement uncertainty across 0–85°C ambient - meeting ISA-S84 functional safety validation thresholds. |
Use Scenario: Real-time vibration analysis on rotating machinery using USB-connected DAQ cards with onboard signal conditioning. IC Role / Device Role / Timing Role: High-fidelity analog front-end ADC delivering 16-bit samples to host PC via parallel bus or FIFO interface with precise R/C-triggered timing. Use Value: 250ksps sustained sampling with no missing codes enables accurate FFT-based spectral analysis up to 125kHz - detecting bearing faults before mechanical failure. |
| Multiplexed Sensor Systems | Digital Signal Processing Front-End |
Use Scenario: Multi-channel environmental sensing node aggregating temperature, pressure, and humidity from 8+ sensors using analog multiplexer switching. IC Role / Device Role / Timing Role: Central ADC accepting time-multiplexed ±10V inputs; BUSY signal synchronizes channel selection and data latching in microcontroller firmware. Use Value: 1.5µs acquisition time and 2.5µs conversion allow full 8-channel scan at >30ksps per channel - maintaining temporal coherence across all sensors. |
Use Scenario: Real-time audio or ultrasonic signal conditioning in medical ultrasound transceivers requiring low-noise, high-linearity digitization. IC Role / Device Role / Timing Role: Precision ADC feeding 16-bit data stream directly into TI C6000 or Analog Devices SHARC DSPs via parallel interface with BYTE-controlled byte ordering. Use Value: 0.65LSB transition noise and –102dB THD preserve signal integrity for coherent beamforming algorithms - avoiding false-positive defect detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit, 250ksps ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD976A | Same 16-bit resolution and ±10V input, but requires dual ±5V supplies and external clock; 85dB SNR vs LTC1606's 90dB. | Used in legacy test equipment where dual-supply infrastructure exists; lacks integrated reference and internal clock. | Select AD976A only if existing design already uses ±5V rails and external timing - avoid for new single-supply systems. |
| ADS7805 | 16-bit, 100ksps max sampling rate; 87dB SNR; requires external reference and clock; 28-pin DIP/SO packaging. | Targeted at lower-speed, cost-sensitive industrial controllers where 100ksps suffices and board space permits DIP sockets. | Choose ADS7805 for retrofit projects needing pin-compatible replacement in legacy DIP layouts - not for 250ksps throughput needs. |
Compared with AD976A and ADS7805, the LTC1606 uniquely combines single 5V operation, integrated 2.5V reference, internal clock, and 250ksps throughput - reducing component count by ≥4 ICs and eliminating external timing design risk.
Availability
LTC1606 is available at Aetrix Electronics and suitable for industrial process control, PC-based high-speed data acquisition, and multiplexed sensor systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC1606 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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1606 belongs to Linear Technology's precision data acquisition product line, designed specifically for high-accuracy, medium-speed industrial and instrumentation applications where single-supply simplicity and guaranteed monotonicity are critical.
FAQ
What is the maximum sampling rate supported by the LTC1606?
The LTC1606 supports a maximum sampling rate of 250ksps, achieved with a 2.5µs conversion time and 1.5µs acquisition period. This rate is guaranteed across the full industrial temperature range (–40°C to +85°C) and does not require external clocking - the internal synchronized clock ensures consistent timing without jitter sensitivity. The LTC1606 maintains full 16-bit accuracy and no missing codes at this rate.
Does the LTC1606 require an external reference voltage?
No, the LTC1606 includes a factory-trimmed 2.500V ±3mV internal bandgap reference (REF pin) and a buffered 4.096V output (CAP pin) for driving the internal DAC. An external reference can be applied to the REF pin only if higher temperature stability or absolute accuracy is required - the device operates fully functional with its internal reference in most industrial applications.
How is the LTC1606 interfaced to a microprocessor with an 8-bit data bus?
The LTC1606 supports byte-mode operation via the BYTE pin: when BYTE is high, the upper eight bits (D7–D0) appear on pins 15–22 and the lower eight bits (D15–D8) appear on pins 6–13 - enabling direct connection to 8-bit microcontrollers without data-width translation logic. CS and R/C control timing, while BUSY indicates data validity, simplifying firmware integration.
What are the absolute maximum ratings for analog input voltage on the LTC1606?
The LTC1606 analog input (VIN) has an absolute maximum rating of ±25V - exceeding its specified ±10V full-scale range. This overvoltage tolerance protects against transients in industrial environments without requiring external clamping diodes. Internal ESD structures and input protection circuitry prevent latch-up even with >100mA fault current, provided DGND, AGND1, and AGND2 remain within ±0.3V of each other.
Can the LTC1606 operate from a single 3.3V supply?
No, the LTC1606 requires a 4.75V to 5.25V supply on both VANA and VDIG pins - it is not rated for 3.3V operation. Attempting to power it from 3.3V will result in undefined behavior, degraded linearity, or failure to meet AC specifications. For 3.3V systems, consider newer alternatives like the AD7682 or LTC23xx family, which are explicitly designed for 3.3V logic compatibility.
DC1255A-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Number of A/D Converters:
- 1
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Data Interface:
- Parallel
- Input Range:
- ±10V
- Power (Typ) @ Conditions:
- 75mW @ 250kSPS
- Utilized IC / Part:
- LTC1606
- Contents:
- Board(s)
DC1255A-B FAQ
1.How can I place an order for DC1255A-B through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1255A-B 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 DC1255A-B reliable?
The price and inventory of DC1255A-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1255A-B is usually 5 days.
3.What payment methods are accepted for DC1255A-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1255A-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC1255A-B?
DC1255A-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1255A-B 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 DC1255A-B?
For technical support, including DC1255A-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1255A-B requirements.
6.How does Aetrix verify that DC1255A-B is sourced from the original manufacturer or authorized distributors?
All DC1255A-B 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 DC1255A-B meets industry standards.
7.What is the process for return or replacement of DC1255A-B?
All DC1255A-B units undergo pre-shipment inspection (PSI). If there is an issue with DC1255A-B, 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 DC1255A-B part is unused and in its original packaging.
Return procedure for DC1255A-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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