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Analog Devices Inc. LTC1404IS8#PBF
- Part No.:
- LTC1404IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1404IS8#PBF.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,887
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Product details
Overview
LTC1404IS8#PBF from Analog Devices (acquired 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 internal reference, and 3-wire SPI/MICROWIRE-compatible serial interface. Designed for high-speed data acquisition in portable instrumentation and telecom front-ends, it delivers ±1LSB INL/DNL, 69dB S/(N+D) at 100kHz, and supports unipolar (0–4.096V) or bipolar (±2.048V) input ranges.
For engineers reviewing the LTC1404IS8#PBF datasheet, LTC1404IS8#PBF pinout, LTC1404IS8#PBF application, or LTC1404IS8#PBF equivalent, key selection criteria include guaranteed no-missing-codes over temperature, Nap/Sleep power modes (7.5mW / 60µW), REFREADY signaling after Sleep wake-up, and SO-8 footprint compatibility with legacy 12-bit sampling ADCs.
Technical Context
The LTC1404IS8#PBF employs a capacitive DAC-based successive approximation architecture with internal zeroing switch and comparator offset nulling during acquisition. Its sample-and-hold acquires analog inputs in 160ns (bipolar) or 200ns (unipolar), followed by bit-by-bit comparison synchronized to an external 9.6MHz clock.
Conversion is initiated by a rising edge on CONV; the 12-bit result shifts out MSB-first on DOUT with timing-critical setup/hold relative to CLK. The internal 2.43V reference is curvature-compensated and factory-trimmed, providing ≤45ppm/°C full-scale drift and supporting external overdrive for span adjustment in bipolar mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with guaranteed no missing codes over temperature |
| Sampling Rate | 600ksps maximum - enables undersampling of signals up to 300kHz Nyquist frequency |
| Power Dissipation | 75mW typical in normal conversion; 7.5mW in Nap mode; 60µW in Sleep mode |
| Analog Input Range | 0V to 4.096V (unipolar) or ±2.048V (bipolar) - 1mV/LSB scaling |
| S/(N + D) | 69dB min at 100kHz input - ensures ≥11.2 ENOB for precision measurement |
| INL / DNL | ±1LSB max over full temperature range - supports calibrated sensor interfaces |
| Reference Output | 2.43V ±20mV, ±45ppm/°C drift - decoupled via 10µF + 0.1µF for low-noise operation |
Pinout & Package
Package: 8-lead plastic SOIC (SO-8), 150 mil width, θJA = 130°C/W, rated for –40°C to +85°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC (Pin 1) | Positive supply input | 4.75V–5.25V for unipolar; 4.75V–5.25V per rail for bipolar - requires 10µF + 0.1µF bypass to GND |
| AIN (Pin 2) | Analog input | High-impedance node accepting 0–4.096V (unipolar) or ±2.048V (bipolar); 5pF hold capacitance |
| VREF (Pin 3) | Internal reference output | 2.43V source capable of 1mA load; externally overdrivable to adjust span in bipolar mode |
| GND (Pin 4) | Analog ground reference | Must connect directly to analog ground plane - separate from digital return paths |
| DOUT (Pin 5) | Serial data output | MSB-first 12-bit result; Hi-Z when inactive; REFREADY bit included in data word after Sleep wake-up |
| CONV (Pin 7) | Conversion start input | Rising-edge triggered; double pulse enters Nap mode, quadruple pulse enters Sleep mode |
| CLK (Pin 6) | Serial clock input | 0.1–9.6MHz; 40ns minimum pulse width; wakes device from Nap/Sleep on active edge |
| VSS (Pin 8) | Negative supply input | –5.25V to –2.45V for bipolar operation; tied to GND for unipolar - requires 10µF + 0.1µF bypass |
Key Features
| Feature | Design Value |
|---|---|
| Integrated sample-and-hold | 160ns acquisition time in bipolar mode - eliminates need for external SHA in most signal chains |
| Low-power shutdown modes | Nap mode enables immediate wake-up with 7.5mW draw; Sleep mode draws only 60µW and asserts REFRDY on first conversion |
| Flexible input configuration | Automatic unipolar/bipolar detection via VSS voltage level - no mode-select pins required |
| Factory-trimmed reference | 2.43V ±20mV with ±45ppm/°C tempco - reduces calibration burden in industrial temperature ranges |
| 3-wire serial interface | SPI/MICROWIRE-compatible with no CS pin - simplifies microcontroller connection using only CONV, CLK, DOUT |
Applications
| Portable Data Loggers | Telecom Baseband Receivers |
|---|---|
Use Scenario: Battery-powered environmental sensor nodes acquiring temperature, pressure, and humidity at 100–500ksps rates. 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 mode reduces average power to <10mW during idle intervals while enabling sub-microsecond wake-up for event-driven sampling. | Use Scenario: Digitizing IF signals in GSM/CDMA base station receivers prior to DSP demodulation. IC Role / Device Role / Timing Role: High-fidelity sampling front-end converting analog baseband to 12-bit serial stream for FPGA-based channelization. Use Value: 69dB S/(N+D) at 100kHz and –76dB THD ensure minimal distortion in adjacent-channel interference testing. |
| Handheld Test Equipment | Digital Oscilloscope Front-Ends |
Use Scenario: Compact multimeters and LCR meters requiring DC-accurate, low-drift conversion for 4½-digit resolution. IC Role / Device Role / Timing Role: Precision unipolar ADC measuring mV-level transducer outputs with internal 2.43V reference as scaling standard. Use Value: ±1LSB INL/DNL and 45ppm/°C full-scale drift support factory calibration valid across –40°C to +85°C operating range. | Use Scenario: Low-cost digital storage oscilloscopes capturing transient waveforms up to 300kHz bandwidth. IC Role / Device Role / Timing Role: Real-time sampling engine feeding 12-bit samples to on-board memory buffer at 600ksps. Use Value: Full linear bandwidth of 1MHz (S/(N+D) ≥68dB) allows faithful reconstruction of fast-rising edges without aliasing artifacts. |
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 reference and level-shifting for ±5V systems; lower power but reduced speed | Select for ultra-low-power battery systems where 200ksps suffices and external reference is acceptable |
| MAX1113ECUA+ | Single 2.7–3.6V supply; 100ksps; internal 2.048V reference; µMAX-8 package | Not compatible with 5V or bipolar operation; smaller footprint but lower performance at high frequencies | Select for space-constrained 3.3V embedded systems needing basic 12-bit conversion without bipolar support |
Compared with ADS7822U and MAX1113ECUA+, the LTC1404IS8#PBF uniquely combines 600ksps throughput, integrated 2.43V reference, bipolar/unipolar auto-detection, and dual-supply flexibility - making it optimal for mixed-signal test equipment and telecom infrastructure where speed, accuracy, and supply versatility are jointly critical.
Availability
LTC1404IS8#PBF is available at Aetrix Electronics and suitable for portable instrumentation, telecom baseband receivers, handheld test equipment, and digital oscilloscope front-ends requiring stable component supply across extended temperature ranges.
Supply support for LTC1404IS8#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, formed through the acquisition of Linear Technology in 2017.
The LTC1404IS8#PBF belongs to ADI's legacy Linear Technology precision data acquisition product line, engineered for high-speed, low-power, and high-accuracy sampling in portable, industrial, and communications systems where board space and power budget are constrained.
FAQ
What is the operating temperature range for the LTC1404IS8#PBF?
The LTC1404IS8#PBF is specified for operation from –40°C to +85°C ambient temperature (Industrial grade). This range is confirmed in the Absolute Maximum Ratings table and applies to all key AC/DC specifications including INL, DNL, S/(N+D), and THD - ensuring reliable performance in harsh environments without derating.
Does the LTC1404IS8#PBF require an external reference?
No, the LTC1404IS8#PBF includes a factory-trimmed, temperature-compensated 2.43V internal reference available at Pin 3 (VREF). It can drive up to 1mA and supports external overdrive for bipolar span adjustment. An external reference is optional - used only when higher initial accuracy or lower drift than ±45ppm/°C is required.
How does the Nap mode function on the LTC1404IS8#PBF?
The LTC1404IS8#PBF enters Nap mode upon receiving two consecutive CONV pulses while CLK is low. In Nap mode, supply current drops to 1.3–3.0mA (7.5mW), and the device wakes instantly on the next CLK edge to begin conversion - eliminating wake-up latency. This mode is ideal for burst-mode acquisition synchronized to external triggers.
Can the LTC1404IS8#PBF operate with only a single 5V supply?
Yes, the LTC1404IS8#PBF supports true unipolar operation with only a single 5V supply (VCC = 4.75–5.25V, VSS = GND). In this configuration, it digitizes 0V to 4.096V analog inputs with 1mV/LSB resolution. VSS must be tied to GND, and the internal circuitry automatically configures for unipolar mode without additional control signals.
What is the purpose of the REFRDY bit in the LTC1404IS8#PBF serial output?
The REFRDY bit is the MSB of the 12-bit serial data word output on DOUT. It is asserted high only after the internal reference has settled following exit from Sleep mode - indicating the device is ready for valid conversion. This eliminates need for fixed delay timers and enables deterministic synchronization in low-power wake-up sequences.
LTC1404IS8#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1404IS8#PBF FAQ
1.How can I place an order for LTC1404IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1404IS8#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 LTC1404IS8#PBF reliable?
The price and inventory of LTC1404IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1404IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1404IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1404IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1404IS8#PBF?
LTC1404IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1404IS8#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 LTC1404IS8#PBF?
For technical support, including LTC1404IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1404IS8#PBF requirements.
6.How does Aetrix verify that LTC1404IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1404IS8#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 LTC1404IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1404IS8#PBF?
All LTC1404IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1404IS8#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 LTC1404IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1404IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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