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Analog Devices Inc. LTC1400IS8#PBF
- Part No.:
- LTC1400IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1400IS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:300
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Product details
Overview
LTC1400IS8#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 400ksps successive-approximation ADC with integrated sample-and-hold and precision 2.42V bandgap reference. It operates from single 5V or ±5V supplies, supports unipolar (0V–4.096V) and bipolar (±2.048V) input ranges, and features Nap (6mW) and Sleep (30μW) power modes - enabling high-speed data acquisition in battery-powered instrumentation and portable test equipment.
For engineers reviewing the LTC1400IS8#PBF datasheet, LTC1400IS8#PBF pinout, LTC1400IS8#PBF application, or LTC1400IS8#PBF equivalent, key selection criteria include guaranteed no-missing-codes performance, ±1LSB INL/DNL over temperature, 70dB S/(N+D) at 100kHz, SPI/MICROWIRE™-compatible 3-wire serial interface, and SO-8 package compatibility with space-constrained PCB layouts.
Technical Context
The LTC1400IS8#PBF implements a capacitive DAC-based successive approximation architecture with internal zeroing switch and comparator offset nulling. Its sample-and-hold acquires analog signals in ≤230ns (unipolar) or ≤200ns (bipolar), followed by bit-by-bit conversion synchronized to an external 6.4MHz clock.
It delivers deterministic timing: 2.1μs conversion time, 45–65ns aperture delay (jitter <50ps), and immediate wake-up from Nap mode in 350ns. The REFRDY bit in the serial output indicates internal reference settling after Sleep mode exit - critical for systems requiring guaranteed first-conversion validity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes over full industrial temperature range (–40°C to +85°C) |
| Sampling Rate | 400ksps maximum - supports real-time capture of signals up to 200kHz Nyquist bandwidth |
| INL / DNL | ±1LSB over temperature - ensures monotonicity and linearity for precision measurement systems |
| S/(N + D) | 70dB at 100kHz input (industrial temp) - enables accurate spectral analysis in telecom and audio applications |
| THD | –76dB at 100kHz input - low distortion preserves signal fidelity in high-fidelity data acquisition |
| Power Modes | Nap mode: 6mW; Sleep mode: 30μW - extends battery life in handheld instruments without sacrificing wake-up latency |
| Analog Input Range | 0V to 4.096V (unipolar, 1mV/LSB) or ±2.048V (bipolar) - matches standard sensor and signal conditioning outputs |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), 150°C max junction temperature, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | Accepts 4.75V–5.25V; requires 10μF + 0.1μF bypass to GND for stable reference and analog performance |
| AIN (Pin 2) | Analog input | High-impedance node; accepts 0V–4.096V (unipolar) or ±2.048V (bipolar); draws ≤±1μA leakage during conversion |
| VREF (Pin 3) | Internal reference output | 2.42V ±20mV; supplies up to 1mA; REFRDY bit indicates readiness after Sleep wake-up |
| GND (Pin 4) | Analog ground reference | Must connect directly to low-impedance analog ground plane; separates analog/digital return paths |
| DOUT (Pin 5) | Serial data output | 3-wire SPI/MICROWIRE™-compatible; tri-state Hi-Z when inactive; valid 40–80ns after CLK↑ |
| CLK (Pin 6) | Serial clock input | 0.1–6.4MHz; minimum 50ns pulse width; controls data shift-out timing and Nap/Sleep entry |
| CONV (Pin 7) | Conversion start trigger | Active-high edge initiates conversion; double-pulse enters Nap, quadruple-pulse enters Sleep mode |
| VSS (Pin 8) | Negative supply input | Required only for bipolar operation (–5.25V to –2.45V); tied to GND in unipolar mode |
Key Features
| Feature | Design Value |
|---|---|
| Integrated precision reference | 2.42V ±20mV, ±45ppm/°C drift, factory-trimmed bandgap with curvature correction |
| Flexible input configuration | Automatic unipolar/bipolar detection via VSS voltage level; eliminates manual mode selection |
| Low-latency power management | Nap mode wakes in 350ns with full accuracy; Sleep mode consumes only 30μW while retaining state |
| Robust analog input interface | ≤5pF hold-mode capacitance and ±1μA leakage enable direct connection to low-output-impedance op amps (e.g., LT1363) |
| Guaranteed AC performance | 70dB S/(N+D) and –76dB THD at 100kHz over full industrial temperature range - verified, not typical-only |
Applications
| Portable Test Equipment | Digital Signal Processing Front-End |
|---|---|
Use Scenario: Handheld oscilloscopes and multimeters acquiring transient waveforms under battery power. IC Role / Device Role / Timing Role: Primary ADC digitizing analog front-end signals at 400ksps with on-chip reference and low-power Nap/Sleep cycling. Use Value: 30μW Sleep mode extends runtime between charges; ±1LSB INL ensures calibrated measurement accuracy across operating temperature. | Use Scenario: Real-time spectral analysis in embedded DSP systems processing audio or RF IF signals. IC Role / Device Role / Timing Role: High-fidelity sampling stage feeding FFT engines; 70dB S/(N+D) preserves dynamic range for noise-sensitive algorithms. Use Value: 200kHz full-linear bandwidth (S/(N+D) ≥68dB) supports undersampling of higher-frequency signals without aliasing degradation. |
| Industrial Sensor Data Acquisition | Battery-Powered Monitoring Systems |
Use Scenario: Distributed temperature/pressure sensors transmitting digitized readings over RS-485 or LoRaWAN. IC Role / Device Role / Timing Role: Precision analog-to-digital converter interfacing with bridge sensors and instrumentation amplifiers. Use Value: Unipolar 0V–4.096V input range matches 4–20mA loop receivers; no-missing-codes guarantee prevents data gaps in long-term logging. | Use Scenario: Remote environmental monitors (e.g., air quality, soil moisture) operating for months on coin-cell batteries. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated only during scheduled measurement windows. Use Value: 6mW Nap mode allows microsecond wake-up between samples; 30μW Sleep mode minimizes quiescent drain during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, serial-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200ksps, SPI interface, 2.7–5.25V supply; no internal reference; requires external REF | Lacks integrated reference and Nap/Sleep modes; lower sampling rate limits high-speed use cases | Choose when board space allows external reference and power budget permits higher active current |
| MAX1113ECUA+ | 12-bit, 100ksps, SPI, internal 2.048V reference; 2.7–3.6V supply only; no Sleep mode | Lower speed and narrower supply range; reference voltage differs (2.048V vs 2.42V), affecting full-scale scaling | Prefer for ultra-low-voltage (3.3V-only) designs where 100ksps suffices and reference flexibility is acceptable |
Compared with ADS7822U and MAX1113ECUA+, the LTC1400IS8#PBF provides higher throughput (400ksps), integrated 2.42V reference with REFRDY signaling, and dual low-power states - making it optimal for portable, high-accuracy, mixed-supply (5V/±5V) systems requiring minimal external components.
Availability
LTC1400IS8#PBF is available at Aetrix Electronics and suitable for portable test equipment, industrial sensor data acquisition, and battery-powered monitoring systems requiring stable component supply across extended temperature ranges.
Supply support for LTC1400IS8#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC1400 series was developed by Linear Technology (acquired by ADI in 2017) to deliver complete, easy-to-use, low-power 12-bit ADC solutions for portable and embedded instrumentation where size, power, and precision are critical.
FAQ
What is the operating temperature range for the LTC1400IS8#PBF?
The LTC1400IS8#PBF is rated for the industrial temperature range of –40°C to +85°C. All key specifications - including ±1LSB INL/DNL, 70dB S/(N+D), and 30μW Sleep mode current - are guaranteed across this full range, unlike commercial-grade variants that specify only at 25°C.
Does the LTC1400IS8#PBF require an external reference?
No, the LTC1400IS8#PBF includes a factory-trimmed, temperature-compensated 2.42V internal reference available at Pin 3 (VREF). This reference can drive up to 1mA and supports both unipolar and bipolar operation. External reference override is possible but not required for standard use of LTC1400IS8#PBF.
How does the Nap mode differ from Sleep mode in the LTC1400IS8#PBF?
Nap mode reduces power to 6mW while allowing immediate (350ns) wake-up and conversion; Sleep mode cuts consumption to 30μW but requires reference re-stabilization - signaled by the REFRDY bit in the serial output - before valid conversion. Both modes are entered via CONV pin pulsing per the LTC1400IS8#PBF timing diagram.
Can the LTC1400IS8#PBF operate from a single 5V supply in bipolar mode?
No. Bipolar operation of the LTC1400IS8#PBF requires separate ±5V supplies (VCC = +5V, VSS = –5V) to support the ±2.048V input range. Unipolar mode (0V–4.096V) functions correctly with only a single 5V supply and VSS tied to GND - a key distinction confirmed in the LTC1400IS8#PBF absolute maximum ratings and functional description.
Is the LTC1400IS8#PBF pin-compatible with other members of the LTC1400 family?
Yes, all LTC1400 variants - including LTC1400CS8, LTC1400IS8, and LTC1400HS8 - share identical SO-8 pinout, electrical interface, and timing behavior. The LTC1400IS8#PBF differs only in its industrial-grade temperature rating (–40°C to +85°C) and part marking; no PCB redesign is needed when upgrading from commercial-grade versions.
LTC1400IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 400k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- ±5V, 5V
- Voltage - Supply, Digital:
- ±5V, 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1400IS8#PBF FAQ
1.How can I place an order for LTC1400IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1400IS8#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 LTC1400IS8#PBF reliable?
The price and inventory of LTC1400IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1400IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1400IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1400IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1400IS8#PBF?
LTC1400IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1400IS8#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 LTC1400IS8#PBF?
For technical support, including LTC1400IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1400IS8#PBF requirements.
6.How does Aetrix verify that LTC1400IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1400IS8#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 LTC1400IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1400IS8#PBF?
All LTC1400IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1400IS8#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 LTC1400IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1400IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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