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Analog Devices Inc. LTC1199IS8#PBF
- Part No.:
- LTC1199IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC1199IS8#PBF.pdf
- Description:
- IC ADC 10BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,406
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Product details
Overview
LTC1199IS8#PBF from Analog Devices (formerly Linear Technology) is a 10-bit, 250ksps successive approximation ADC with integrated 2-channel analog multiplexer and auto shutdown. It operates from a single 2.7V supply, draws only 0.8mA at full speed, and uses SPI/MICROWIRE-compatible 4-wire serial interface. It targets low-power portable instrumentation requiring precise ground-referenced or differential voltage measurements.
For engineers reviewing the LTC1199IS8#PBF datasheet, LTC1199IS8#PBF pinout, LTC1199IS8#PBF application, or LTC1199IS8#PBF equivalent, key selection factors include its 2.7V operation, software-selectable MUX configuration, 250ksps sampling rate, ±1 LSB linearity, and MSOP-8 package compatibility with space-constrained embedded systems.
Technical Context
The LTC1199IS8#PBF implements a switched-capacitor SAR architecture with on-chip sample-and-hold and a 2-channel analog multiplexer. Its digital interface requires a start bit followed by 3-bit configuration word (SGL/DIFF, ODD/SIGN, DUMMY) to select input channel and mode before conversion.
It supports unipolar transfer only, with VREF internally tied to VCC - eliminating external reference components. Conversion timing is clock-synchronized: 16-cycle total cycle time, 10.5-cycle conversion time, and 1.5-cycle sampling window, all referenced to the rising edge of CLK.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit - delivers 1024 discrete output codes for precision measurement |
| Max Sampling Rate | 250ksps - enables real-time acquisition of signals up to ~125kHz Nyquist bandwidth |
| Supply Voltage | 2.7V to 4V - compatible with Li-ion battery and low-voltage logic rails |
| Supply Current (250ksps) | 0.8mA typical - reduces thermal load and extends battery life in portable devices |
| INL / DNL | ±1 LSB / ±1 LSB - ensures monotonicity and accurate code transitions across full scale |
| Signal-to-Noise + Distortion | 58dB at 50kHz - supports >9-bit effective resolution for medium-bandwidth sensor signals |
| Reference Configuration | VREF = VCC - simplifies BOM by removing external reference IC or resistor divider |
Pinout & Package
Package: 8-pin MSOP (MS8), 3mm × 3mm footprint, exposed pad for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 1) | Chip Select Input | Active-low enable; high state triggers auto shutdown, reducing current to µA-level leakage |
| CH0 (Pin 2) | Analog Input Channel 0 | Positive input for single-ended or differential measurement; includes sample-and-hold |
| CH1 (Pin 3) | Analog Input Channel 1 | Positive/negative input per MUX configuration; no sample-and-hold - must remain stable during conversion |
| GND (Pin 4) | Analog Ground | Primary return path for analog circuitry; must connect directly to low-impedance analog ground plane |
| VCC (Pin 5) | Positive Supply & Internal Reference | Supplies core logic and sets full-scale range (VREF = VCC); bypass with 1µF ceramic + 10µF tantalum |
| DOUT (Pin 6) | Serial Data Output | MSB-first, 10-bit conversion result; tri-stated when CS is high or during DIN activity |
| CLK (Pin 7) | Serial Clock Input | Synchronizes all data transfers; max 3.5MHz at 2.7V; rising edge clocks data in/out |
| DIN (Pin 8) | Digital Configuration Input | Receives 4-bit start + 3-bit command word to configure MUX and initiate conversion |
Key Features
| Feature | Design Value |
|---|---|
| Software-Selectable 2-Channel MUX | Configurable via 3-bit command word to measure CH0–GND, CH1–GND, or CH0–CH1 differentially |
| Auto Shutdown Between Conversions | Reduces supply current linearly with sampling frequency - 0.8mA at 250ksps, <1µA in idle |
| VREF = VCC Architecture | Eliminates external reference component and associated noise/accuracy trade-offs |
| SPI/MICROWIRE-Compatible Interface | Operates without glue logic; supports DIN/DOUT wire-OR for 3-wire system integration |
| Low Input Leakage (±1µA) | Enables direct connection to high-impedance sensors (e.g., thermistors, pH electrodes) without buffer amplifiers |
Applications
| Portable ECG Monitor | Industrial Temperature Sensor Node |
|---|---|
Use Scenario: Digitizing bipolar lead signals from dry-electrode ECG front-end operating from coin-cell battery. IC Role / Device Role / Timing Role: 10-bit SAR ADC with software-configurable differential MUX selects between limb leads; auto shutdown extends battery life beyond 72 hours. Use Value: 250ksps sampling captures QRS complex fidelity; 2.7V operation matches battery discharge curve; internal VREF eliminates reference drift errors. |
Use Scenario: Reading multiple RTD or thermistor bridges in a wireless HVAC controller with strict power budget. IC Role / Device Role / Timing Role: Dual-channel ADC sequentially measures bridge outputs using CH0/CH1 MUX; low 0.8mA active current minimizes self-heating error. Use Value: ±1 LSB linearity ensures <0.1°C temperature accuracy; GND-referenced inputs simplify bridge biasing; MSOP-8 eases layout in dense PCBs. |
| Battery-Powered Data Logger | Compact Power Quality Analyzer |
Use Scenario: Logging vibration, pressure, and humidity over weeks using energy-harvesting power source. IC Role / Device Role / Timing Role: Low-power ADC samples sensors intermittently; DIN/DOUT wire-OR reduces MCU GPIO count and PCB layer count. Use Value: Auto shutdown cuts average current to sub-µA between samples; 10-bit resolution preserves dynamic range across varying sensor gains. |
Use Scenario: Measuring AC mains harmonics in DIN-rail mounted meter with space-limited enclosure. IC Role / Device Role / Timing Role: ADC digitizes conditioned voltage/current waveforms; 58dB SNDR supports THD analysis up to 5th harmonic at 50Hz. Use Value: 250ksps sampling satisfies IEC 61000-4-7 Class A requirements; MSOP-8 package fits tight thermal constraints near power stage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200ksps, 2.7–5.25V supply, SPI-only interface, no MUX | Lacks channel selection; lower resolution limits dynamic range in precision sensor apps | Choose for cost-sensitive, lower-resolution portable systems where MUX not required |
| MAX11100ETE+ | 12-bit resolution, 500ksps, 2.7–3.6V supply, internal reference, no MUX | Higher resolution but no analog multiplexer; larger 16-pin TQFN package increases board area | Prefer when higher ENOB needed and dual-channel sampling is handled externally |
Compared with ADS7822U and MAX11100ETE+, the LTC1199IS8#PBF uniquely balances 10-bit precision, integrated 2-channel MUX, ultra-low 0.8mA active current, and compact MSOP-8 footprint - making it optimal for battery-powered multi-sensor nodes where size, power, and channel flexibility are jointly constrained.
Availability
LTC1199IS8#PBF is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, battery-powered data loggers, and compact power monitoring systems requiring stable component supply across long production cycles.
Supply support for LTC1199IS8#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 LTC1199 series belongs to ADI's legacy Linear Technology precision data acquisition portfolio, designed specifically for low-power, space-constrained embedded systems needing reliable 10-bit ADC performance with minimal external components.
FAQ
What is the maximum clock frequency supported by the LTC1199IS8#PBF?
The LTC1199IS8#PBF supports a maximum clock frequency of 3.5MHz when operating from a 2.7V supply. This limit ensures accurate conversion timing and maintains ±1 LSB linearity across temperature. Exceeding this frequency may cause timing violations in the 16-cycle serial interface or degrade INL/DNL performance. The device's tCYC (total cycle time) is fixed at 16 clock periods, so higher clock rates reduce overall conversion latency but do not increase sampling throughput beyond 250ksps.
Does the LTC1199IS8#PBF require an external voltage reference?
No, the LTC1199IS8#PBF does not require an external voltage reference. Its VREF pin is internally tied to VCC, meaning the full-scale input range is always equal to the supply voltage (e.g., 0V to 2.7V at VCC = 2.7V). This eliminates reference ICs, resistors, and associated noise sources - simplifying design and improving ratiometric accuracy when measuring sensor bridges powered from the same supply. The LTC1199IS8#PBF specification assumes VREF = VCC in all electrical characteristics.
Can the LTC1199IS8#PBF perform true differential measurements between CH0 and CH1?
Yes, the LTC1199IS8#PBF supports true differential measurement between CH0 and CH1. When configured via the 3-bit command word (SGL/DIFF = 0, ODD/SIGN = 1), the device measures the voltage difference (CH0 – CH1) with respect to GND. This mode leverages the internal sample-and-hold on CH0 and relies on CH1 remaining stable during acquisition. The differential span equals VCC, and the output code follows the unipolar transfer function: 0x000 corresponds to –VCC/2, and 0x3FF corresponds to +VCC/2 - enabling signed interpretation in firmware.
How does auto shutdown work in the LTC1199IS8#PBF?
In the LTC1199IS8#PBF, auto shutdown activates automatically whenever CS is held high - disabling the internal oscillator, sample-and-hold, and digital interface, reducing supply current to <1µA. During active conversion, current scales linearly with sampling frequency: 0.8mA at 250ksps, ~0.4mA at 125ksps, and ~8µA at 250sps. This behavior is inherent to the architecture and requires no software control or register writes - making it ideal for burst-mode sensing where the host MCU toggles CS to trigger individual conversions and minimize average power.
Is the LTC1199IS8#PBF pin-compatible with the LTC1199CS8?
Yes, the LTC1199IS8#PBF is pin-compatible with the LTC1199CS8. Both are 8-pin MSOP packages with identical pinout (CS, CH0, CH1, GND, VCC, DOUT, CLK, DIN) and share the same footprint, thermal pad layout, and solder profile. The primary difference is operating temperature grade: LTC1199IS8#PBF is rated for –45°C to +85°C (industrial), while LTC1199CS8 is rated for 0°C to +70°C (commercial). Electrical specifications are otherwise identical, allowing drop-in replacement in industrial designs requiring extended temperature support.
LTC1199IS8#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:
- 10
- Sampling Rate (Per Second):
- 450k
- Number of Inputs:
- 1, 2
- Input Type:
- Differential, 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
- Voltage - Supply, Analog:
- 4V ~ 6V
- Voltage - Supply, Digital:
- 4V ~ 6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SO
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC1199IS8#PBF FAQ
1.How can I place an order for LTC1199IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1199IS8#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 LTC1199IS8#PBF reliable?
The price and inventory of LTC1199IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1199IS8#PBF is usually 5 days.
3.What payment methods are accepted for LTC1199IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1199IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1199IS8#PBF?
LTC1199IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1199IS8#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 LTC1199IS8#PBF?
For technical support, including LTC1199IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1199IS8#PBF requirements.
6.How does Aetrix verify that LTC1199IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LTC1199IS8#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 LTC1199IS8#PBF meets industry standards.
7.What is the process for return or replacement of LTC1199IS8#PBF?
All LTC1199IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC1199IS8#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 LTC1199IS8#PBF part is unused and in its original packaging.
Return procedure for LTC1199IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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