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Analog Devices Inc. LTC1404CS8#PBF
- Part No.:
- LTC1404CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1404CS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:534
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Product details
Overview
LTC1404CS8#PBF from Analog Devices (formerly Linear Technology) is a 12-bit, 600ksps successive-approximation ADC in SO-8 package, operating from single 5V or ±5V supplies. It integrates a 160ns sample-and-hold, precision 2.43V bandgap reference, and 3-wire SPI/MICROWIRE-compatible serial interface. Designed for high-speed data acquisition in portable instrumentation and DSP front-ends, it delivers ±1LSB INL/DNL, 69dB S/(N+D), and –76dB THD at 100kHz.
For engineers reviewing the LTC1404CS8#PBF datasheet, LTC1404CS8#PBF pinout, LTC1404CS8#PBF application, or LTC1404CS8#PBF equivalent, key selection criteria include unipolar/bipolar mode flexibility, Nap/Sleep power states (7.5mW / 60µW), internal reference stability (±45ppm/°C), and guaranteed no-missing-codes performance across temperature.
Technical Context
The LTC1404CS8#PBF employs a capacitive DAC-based successive approximation architecture with integrated zeroing switch and comparator offset nulling. Its sample-and-hold acquires analog input in 160ns (bipolar) or 200ns (unipolar), followed by bit-by-bit comparison using internal 12-bit DAC charge redistribution.
Conversion is initiated by rising edge on CONV; output is serialized MSB-first via DOUT synchronized to CLK (up to 9.6MHz). The device supports automatic bipolar/unipolar detection based on VSS voltage level and provides REFRDY flag in serial word to indicate reference settling after Sleep wake-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes over temperature - ensures monotonic transfer function for control-loop and measurement integrity. |
| Sampling Rate | 600ksps maximum - enables real-time capture of signals up to 300kHz Nyquist bandwidth. |
| Power Dissipation | 75mW typical at 600ksps - balances speed and thermal load in space-constrained embedded systems. |
| S/(N + D) | 69dB min at 100kHz input - supports >11 ENOB for precision waveform digitization. |
| INL / DNL | ±1LSB max over temperature - eliminates code-dependent gain/offset errors in calibration-sensitive applications. |
| Reference Output | 2.43V ±20mV, ±45ppm/°C drift - provides stable scaling for 1mV/LSB (0–4.096V) unipolar or ±2.048V bipolar full-scale ranges. |
| Interface | 3-wire SPI/MICROWIRE-compatible - reduces MCU GPIO count and simplifies PCB routing versus parallel bus ADCs. |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), 150 mil width, JEDEC MS-012AC, θJA = 130°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply rail | 4.75–5.25V for unipolar; 4.75–5.25V per rail in bipolar - requires 10µF + 0.1µF bypass to GND for noise-sensitive conversion. |
| AIN (Pin 2) | Analog input node | High-impedance input (5pF hold capacitance) accepting 0–4.096V (unipolar) or ±2.048V (bipolar) - driven by op amps settling within 160ns. |
| VREF (Pin 3) | Internal reference output | 2.43V ±20mV source capable of 1mA sink/source - decoupling mandatory; can be overdriven ≥2.46V for span adjustment. |
| GND (Pin 4) | Analog ground reference | Must connect directly to low-impedance analog ground plane - separates digital return paths to minimize noise coupling into AIN/VREF. |
| DOUT (Pin 5) | Serial data output | MSB-first 12-bit word with REFRDY flag bit - tri-statable; timing valid 40–70ns after CLK↑ with CLOAD = 20pF. |
| VSS (Pin 8) | Negative supply rail | –5.25V to –2.45V for bipolar operation; tied to GND for unipolar - bypass identical to VCC; determines auto-mode selection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample-and-hold | 160ns acquisition time in bipolar mode - eliminates external SH circuitry and associated layout complexity. |
| Auto bipolar/unipolar detection | VSS voltage level triggers mode switching - removes need for external configuration logic or jumpers. |
| Nap mode with instant wake-up | 7.5mW consumption and <350ns wake latency - enables burst-mode sampling without conversion delay penalty. |
| Sleep mode with REFRDY flag | 60µW standby and reference-ready indicator in serial word - ensures deterministic timing for low-power wake-and-convert sequences. |
| Internal curvature-corrected reference | ±45ppm/°C full-scale drift - maintains 12-bit accuracy over industrial temperature range without external trimming. |
Applications
| Portable Data Loggers | DSP-Based Signal Analyzers |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes acquiring temperature, pressure, and humidity at 100–500ksps rates. IC Role / Device Role / Timing Role: Primary analog-to-digital converter interfacing MEMS sensors to ultra-low-power MCU via 3-wire serial link. Use Value: Nap mode reduces average current to <1mA during idle intervals while preserving sub-microsecond wake-and-convert latency for event-triggered sampling. | Use Scenario: Real-time spectral analysis of RF IF signals in handheld spectrum analyzers with 100kHz–300kHz input bandwidth. IC Role / Device Role / Timing Role: High-fidelity front-end ADC feeding FFT engine in fixed-point DSP, requiring consistent 69dB SINAD up to Nyquist. Use Value: Guaranteed ±1LSB linearity and –76dB THD ensure accurate harmonic content representation without post-processing correction. |
| Industrial Process Controllers | Medical Ultrasound Beamformers |
Use Scenario: Closed-loop PLC I/O modules digitizing 4–20mA transducer outputs with ±0.1% full-scale accuracy over –40°C to +85°C. IC Role / Device Role / Timing Role: Precision unipolar ADC with internal reference and factory-trimmed INL/DNL, directly replacing external reference + op-amp buffer solutions. Use Value: ±1LSB INL and ±45ppm/°C reference drift eliminate field calibration cycles and support long-term measurement repeatability. | Use Scenario: Channel digitization in portable ultrasound systems where compact size and low self-heating are critical. IC Role / Device Role / Timing Role: Low-power, high-SNR ADC capturing echo return signals with minimal thermal noise contribution to beamformer SNR budget. Use Value: 75mW dissipation at 600ksps and 69dB S/(N+D) enable dense channel packing without compromising image contrast resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, medium-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 2.7–5.25V supply, 200ksps max, SPI-only interface, no internal reference - requires external 2.5V ref. | Lower power (1.5mW @ 200ksps) but half the speed; suited for ultra-low-power sensor nodes with relaxed throughput. | Select when system already includes precision 2.5V reference and sampling rate ≤200ksps suffices. |
| MAX11131AUT+T | Single 2.7–3.6V supply, 500ksps, internal 2.048V ref, SPI interface - smaller 6-pin SOT23 package. | Optimized for 3V battery systems; lower full-scale range limits dynamic headroom vs LTC1404's 4.096V unipolar span. | Select for space-constrained, single-supply designs where 2.048V FS and 500ksps meet requirements. |
Compared with ADS7822U and MAX11131AUT+T, the LTC1404CS8#PBF offers higher sampling rate (600ksps), wider unipolar input range (0–4.096V), and dual-supply bipolar capability - making it preferable for industrial DAQ and mixed-signal test equipment requiring flexibility and speed.
Availability
LTC1404CS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, industrial process controllers, and DSP-based signal analyzers requiring stable component supply with guaranteed long-term availability.
Supply support for LTC1404CS8#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC1404CS8#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered for high-speed, low-power, and high-accuracy analog-to-digital conversion in space- and power-constrained embedded systems.
FAQ
What is the maximum sampling rate supported by the LTC1404CS8#PBF?
The LTC1404CS8#PBF supports a maximum sampling rate of 600ksps, achieved with a 9.6MHz clock input. At this rate, conversion time is 1.36µs and acquisition time is 200ns (unipolar) or 160ns (bipolar). Performance specifications including S/(N+D) and THD are guaranteed at this full rate across the industrial temperature range.
Does the LTC1404CS8#PBF require an external reference voltage?
No, the LTC1404CS8#PBF includes an internal 2.43V temperature-compensated bandgap reference accessible at Pin 3 (VREF). This reference is factory-trimmed to ±20mV and exhibits ±45ppm/°C full-scale drift. External reference driving is optional and only permitted if VREF is overdriven to ≥2.46V to disable the internal source.
How does the LTC1404CS8#PBF handle unipolar versus bipolar operation?
The LTC1404CS8#PBF automatically detects operation mode based on VSS voltage: when VSS = GND, it operates in unipolar mode (0–4.096V input); when VSS = –5V, it switches to bipolar mode (±2.048V input). No external control signals or configuration registers are required - mode selection is hardware-determined and transparent to firmware.
What are the power consumption characteristics of the LTC1404CS8#PBF in Nap and Sleep modes?
In Nap mode, the LTC1404CS8#PBF draws 1.3–3.0mA from VCC (7.5–20mW), waking instantly (<350ns) upon CONV pulse. In Sleep mode, it consumes 8–20µA from VCC and 4–10µA from VSS (60–150µW total), with REFRDY flag indicating reference readiness in the first serial word after wake-up.
Is the LTC1404CS8#PBF pin-compatible with other members of the LTC1404 family?
Yes, the LTC1404CS8#PBF shares identical SO-8 pinout and electrical behavior with all LTC1404 variants (e.g., LTC1404IS8#PBF), differing only in temperature grade (0°C to 70°C for 'C' grade). All share the same VCC, AIN, VREF, GND, VSS, CONV, CLK, and DOUT pin assignments and timing specifications.
LTC1404CS8#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):
- 600k
- 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:
- -
LTC1404CS8#PBF FAQ
1.How can I place an order for LTC1404CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1404CS8#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 LTC1404CS8#PBF reliable?
The price and inventory of LTC1404CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1404CS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1404CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1404CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1404CS8#PBF?
LTC1404CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1404CS8#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 LTC1404CS8#PBF?
For technical support, including LTC1404CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1404CS8#PBF requirements.
6.How does Aetrix verify that LTC1404CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1404CS8#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 LTC1404CS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1404CS8#PBF?
All LTC1404CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1404CS8#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 LTC1404CS8#PBF part is unused and in its original packaging.
Return procedure for LTC1404CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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