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Analog Devices Inc. LTC1400CS8#PBF
- Part No.:
- LTC1400CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1400CS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:172
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Product details
Overview
LTC1400CS8#PBF from Analog Devices (formerly Linear Technology) is a complete 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-saving modes - ideal for portable data acquisition and battery-powered signal conditioning systems.
For engineers reviewing the LTC1400CS8#PBF datasheet, LTC1400CS8#PBF pinout, LTC1400CS8#PBF application, or LTC1400CS8#PBF equivalent, this page delivers verified specifications, SO-8 pin mapping, real-world use cases in high-speed analog front-ends, and two confirmed alternative parts with documented functional and parametric differences.
Technical Context
The LTC1400CS8#PBF implements a 12-bit capacitive DAC-based successive approximation register (SAR) architecture with internal zeroing switch and comparator offset nulling. Its sample-and-hold acquires in 200–230ns (bipolar/unipolar), enabling full 400ksps throughput without external timing components.
It uses a 3-wire serial interface (SPI/MICROWIRE-compatible) with CONV-triggered conversion start, CLK-synchronized DOUT output, and REFRDY flag embedded in serial data to indicate reference settling after Sleep wake-up - eliminating external reference monitoring circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes over temperature - guarantees monotonicity and deterministic code transitions in closed-loop control. |
| Sampling Rate | 400ksps maximum - supports Nyquist-limited input frequencies up to 200kHz with 72dB S/(N+D) and –80dB THD. |
| Power Dissipation | 75mW at 400ksps (5V); 6mW in Nap mode; 30μW in Sleep mode - enables low-duty-cycle sensing in energy-constrained IoT nodes. |
| Analog Input Range | 0V to 4.096V (unipolar, 1mV/LSB) or ±2.048V (bipolar) - matches standard industrial sensor outputs and eliminates external level-shifting. |
| DC Accuracy | ±1LSB INL and DNL, ±6LSB offset error - ensures <0.025% full-scale linearity for precision instrumentation calibration. |
| Reference Output | 2.42V ±20mV, ±45ppm/°C drift - factory-trimmed bandgap reference usable as system reference or overdrivable for span adjustment. |
| Interface | 3-wire serial (CONV, CLK, DOUT) - reduces MCU GPIO count and simplifies PCB routing versus parallel bus ADCs. |
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 | 4.75V–5.25V for unipolar; 4.75V–5.25V with VSS = –5V for bipolar - requires 10μF + 0.1μF bypass to GND for noise immunity. |
| AIN (Pin 2) | Analog input | High-impedance node accepting 0V–4.096V (unipolar) or ±2.048V (bipolar); draws ≤±1μA leakage during conversion. |
| VREF (Pin 3) | Internal reference output | 2.42V source capable of 1mA load; REFRDY bit in serial word indicates settling after Sleep wake-up. |
| GND (Pin 4) | Analog ground reference | Must connect directly to analog ground plane - separates analog return path from digital ground to minimize PSRR degradation. |
| DOUT (Pin 5) | Serial data output | 3-state CMOS output; data valid 40–80ns after CLK↑; Hi-Z state enabled between conversions to reduce bus contention. |
| CLK (Pin 6) | Serial clock input | 0.1–6.4MHz clock; 50ns minimum pulse width triggers wake-up from Nap/Sleep and synchronizes DOUT bit transfer. |
| CONV (Pin 7) | Conversion start trigger | Active-high edge initiates SAR cycle; double-pulse enters Nap mode, quadruple-pulse enters Sleep mode. |
| VSS (Pin 8) | Negative supply input | –5V for bipolar operation; tied to GND for unipolar - internal detection circuit auto-switches mode based on VSS potential. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample-and-hold | 200ns acquisition time (bipolar) eliminates need for external SHA and reduces board area/cost. |
| Auto bipolar/unipolar detection | VSS voltage level automatically configures input range and transfer function - no configuration register or software setup required. |
| REFRDY flag in serial data | Embedded bit signals reference stability after Sleep wake-up - removes external comparator or timer for safe first conversion. |
| Overdrivable VREF pin | Accepts external 2.45V–5V reference to adjust input span in bipolar mode - enables custom full-scale ranges like ±4.231V using LT1019A-5. |
| Low-power Nap mode | 6mW consumption with instant wake-up (<350ns) - maintains responsiveness while cutting power vs. full active mode by >92%. |
Applications
| Portable Data Loggers | Industrial Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Battery-powered environmental monitors sampling thermocouples, RTDs, and pressure transducers at 100–400ksps. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs; CONV-triggered sampling synchronized to low-power MCU sleep cycles. Use Value: Nap/Sleep modes extend battery life to months; integrated reference eliminates external component count and improves long-term drift stability. |
Use Scenario: PLC analog input modules acquiring 4–20mA current loop signals with cold-junction compensation. IC Role / Device Role / Timing Role: High-accuracy front-end ADC converting isolated voltage outputs from I/V converters and thermocouple amplifiers. Use Value: ±1LSB INL/DNL and 45ppm/°C reference drift meet Class A industrial accuracy requirements per IEC 61000-4-30. |
| Digital Audio Front-Ends | Test & Measurement Equipment |
|
Use Scenario: Portable oscilloscopes and spectrum analyzers digitizing baseband audio (20Hz–20kHz) and IF signals up to 200kHz. IC Role / Device Role / Timing Role: Medium-speed ADC capturing time-domain waveforms with 72dB SINAD and –80dB THD at Nyquist. Use Value: Full linear bandwidth of 900kHz allows undersampling of higher-frequency signals while maintaining 11-bit ENOB. |
Use Scenario: Automated test equipment performing parametric measurements on analog ICs and passive components. IC Role / Device Role / Timing Role: Precision digitizer in source-measure units (SMUs) acquiring voltage/current responses with calibrated offset/full-scale trim. Use Value: On-chip trimmable offset and full-scale error (±20LSB range) enable factory calibration without external DACs or op-amp networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7V–5.25V single-supply only; no internal reference; 200ksps max; SPI interface with BUSY pin. | Requires external reference and driver; suited for ultra-low-voltage (2.7V) systems where internal ref is unnecessary. | Select when supply voltage <4.75V or when external reference provides better drift performance than LTC1400's 45ppm/°C. |
| MAX11131AUT+ | 12-bit, 500ksps; internal 2.048V reference; SPI-only interface; no Nap/Sleep modes; 12mW active power. | Higher speed but no low-power states; smaller 6-pin SOT23 package limits thermal dissipation and bypassing options. | Select when throughput >400ksps is mandatory and power budget allows continuous 12mW operation. |
Compared with ADS7822U and MAX11131AUT+, the LTC1400CS8#PBF uniquely combines integrated reference, dual-supply flexibility, and three-tier power management (active/Nap/Sleep) - making it optimal for portable, battery-sensitive, and industrial-grade acquisition where accuracy, autonomy, and supply versatility are critical.
Availability
LTC1400CS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial PLC analog inputs, and test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC1400CS8#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 DSP technologies, serving aerospace, industrial, automotive, and communications markets.
The LTC1400CS8#PBF belongs to Linear's legacy precision data acquisition family, designed specifically for medium-speed, low-power, self-contained ADC applications where integration, accuracy, and supply flexibility outweigh raw speed or digital processing capability.
FAQ
What is the operating temperature range for the LTC1400CS8#PBF?
The LTC1400CS8#PBF is rated for 0°C to 70°C ambient operation (Commercial grade). This is defined by the 'C' suffix in the part number and is validated across all DC and AC specifications including ±1LSB INL/DNL, 72dB S/(N+D), and 30μW Sleep mode current. Industrial-grade variants (e.g., LTC1400IS8) extend to –40°C to 85°C.
Does the LTC1400CS8#PBF require an external reference?
No, the LTC1400CS8#PBF includes a factory-trimmed 2.42V internal bandgap reference available at Pin 3 (VREF). It can drive up to 1mA and exhibits ±45ppm/°C drift. The VREF pin may be overdriven with an external reference (≥2.45V) for span adjustment, but external reference is not required for basic operation.
How does the LTC1400CS8#PBF enter and exit Nap and Sleep modes?
The LTC1400CS8#PBF enters Nap mode with two consecutive CONV pulses and Sleep mode with four consecutive CONV pulses while CLK remains low. Wake-up occurs on the next CLK pulse: Nap wake-up takes <350ns; Sleep wake-up requires 4ms for VREF settling, signaled by the REFRDY bit in the serial output word.
Can the LTC1400CS8#PBF operate with only a single 5V supply?
Yes, the LTC1400CS8#PBF supports unipolar operation with VCC = 5V and VSS tied to GND, accepting 0V–4.096V analog inputs. Bipolar operation (±2.048V) requires VSS = –5V. The device auto-detects VSS potential and configures input range and transfer function accordingly - no software or hardware mode selection is needed.
What is the minimum acquisition time for the LTC1400CS8#PBF in unipolar mode?
The minimum acquisition time for the LTC1400CS8#PBF in unipolar mode is 230ns (typical), defined as the time required for the internal sample-and-hold capacitor to settle to within ½ LSB after the CONV rising edge. This value is guaranteed over temperature and enables reliable 400ksps sampling without external hold-time extension.
LTC1400CS8#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1400CS8#PBF FAQ
1.How can I place an order for LTC1400CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1400CS8#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 LTC1400CS8#PBF reliable?
The price and inventory of LTC1400CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1400CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1400CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1400CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1400CS8#PBF?
LTC1400CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1400CS8#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 LTC1400CS8#PBF?
For technical support, including LTC1400CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1400CS8#PBF requirements.
6.How does Aetrix verify that LTC1400CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1400CS8#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 LTC1400CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1400CS8#PBF?
All LTC1400CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1400CS8#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 LTC1400CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1400CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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