LTC1605-2CN#PBF - 16-Bit 100ksps ±4V Bipolar SAR ADC | ADI
N.º de pieza: LTC1605-2CN#PBF ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $23.46 | $23,46 |
| 10 | $21.12 | $211,20 |
| 100 | $18.77 | $1.877,00 |
| 500 | $16.89 | $8.445,00 |
| 1.000 | $15.05 | $15.050,00 |
LTC1605-2CN#PBF Descripción general
A successive-approximation register (SAR) ADC is a type of data converter that performs one binary bit decision per conversion cycle, using an internal comparator, DAC, and successive-approximation logic. SAR converters sit in the broader ADC hierarchy between delta-sigma (high resolution, low speed) and flash (high speed, low resolution), and are favored for multiplexed data-acquisition systems because they perform a complete, deterministic conversion in N clock cycles with no pipeline latency. The LTC1605-2 exemplifies this architecture with its single-shot, software-controlled conversion cycle.
Key specifications of the LTC1605-2 include 16-bit resolution with no missing codes, ±4 V bipolar input range, 100 ksps sampling rate, parallel data interface, ±2.5 LSB INL typical, and integrated reference. The internal clock and the integrated reference eliminate external ADC support components, simplifying the analog front end. Because the part is single-supply 5 V with a true bipolar differential input stage, designers can connect the output of a ±4 V instrumentation amplifier directly to the ADC inputs with minimal signal conditioning.
The architecture uses a charge-redistribution switched-capacitor DAC inside the SAR loop, a technique that yields excellent DC linearity for instrumentation workloads. The integrated 4.096 V reference is trimmed at the factory, so the converter achieves specified noise and INL performance without external reference components, although a 2.2 µF bypass close to the REF pin is required for full accuracy.
Typical applications include process-control analog input modules, industrial PLC analog front ends, precision data-acquisition boards, multichannel instrumentation front ends with bipolar signals, and laboratory instrumentation that requires 16-bit accuracy without high-speed throughput. Designers in these segments value the deterministic conversion latency and the simple parallel read interface.
When designing the PCB, place the 2.2 µF REF bypass capacitor and the 10 µF VCC decoupling capacitor as close to the IC pins as possible. Use a ground plane under the analog section and keep digital return currents out of the analog ground path. Use the S/H (sample-and-hold) pin or the CS and RD signals to start conversions; the LTC1605-2 does not auto-run.
This page synthesizes distributor pricing, pin-compatible ADI alternatives in the same 28-PDIP footprint, and practical layout notes beyond the manufacturer datasheet, helping engineers evaluate LTC1605-2CN#PBF for drop-in upgrades, second sources, and bipolar-input acquisition channels.
Alternativas directas para LTC1605-2CN#PBF — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con LTC1605-2CN#PBF (mismo factor de forma y huella) — difiere en Supply Voltage, No Missing Codes, Sample-and-Hold, Architecture, Data Interface.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
LTC1605-1CN#PBF
✅ Sustitución directa✓ En stock
$24.4 / unidad
Ver hoja de datos →LTC1605-2IN#PBF
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC1605-2CN#PBF Valores máximos y características eléctricas
| Number of Bits | 16 |
| Frecuencia de muestreo | 100 ksps |
| Number of Inputs | 1 |
| Input Range (Bipolar) | ±4 V |
| Tensión de alimentación | 5 V (single supply) |
| Power Dissipation (typical) | 55 mW |
| Data Interface | Parallel |
| Architecture | SAR (Successive Approximation) |
| Input Configuration | Single-ended / differential bipolar |
| Reference | Internal 4.096 V (trimmed) |
| Sample-and-Hold | Yes (integrated) |
| Internal Clock | Yes (trimmed) |
| Temperatura de funcionamiento | 0 °C to +70 °C |
| Encapsulado / Carcasa | 28-PDIP (0.300 inch / 7.62 mm) |
| Tipo de montaje | Through-Hole |
| Terminal Form | Through-Hole |
| Packaging | Tube |
| Estado RoHS | Compliant (PBF suffix indicates Pb-free) |
Configuración de pines de LTC1605-2CN#PBF
| Pin 1 | VREF — Reference voltage (4.096 V internal) - bypass with 2.2 µF capacitor |
| Pin 2 | AIN+ — Positive analog input |
| Pin 3 | AIN- — Negative analog input |
| Pin 4 | AGND — Analog ground |
| Pin 5 | VCC — +5 V analog supply |
| Pin 6 | DGND — Digital ground |
| Pin 7 | DB15 — Data bit 15 (MSB) |
| Pin 8 | DB14 — Data bit 14 |
| Pin 9 | DB13 — Data bit 13 |
| Pin 10 | DB12 — Data bit 12 |
| Pin 11 | DB11 — Data bit 11 |
| Pin 12 | DB10 — Data bit 10 |
| Pin 13 | DB9 — Data bit 9 |
| Pin 14 | DB8 — Data bit 8 |
| Pin 15 | DB7 — Data bit 7 |
| Pin 16 | DB6 — Data bit 6 |
| Pin 17 | DB5 — Data bit 5 |
| Pin 18 | DB4 — Data bit 4 |
| Pin 19 | DB3 — Data bit 3 |
| Pin 20 | DB2 — Data bit 2 |
| Pin 21 | DB1 — Data bit 1 |
| Pin 22 | DB0 — Data bit 0 (LSB) |
| Pin 23 | CLKOUT — Internal clock output (trimmed) |
| Pin 24 | CS — Chip Select (active low) |
| Pin 25 | RD — Read (active low) - initiates conversion |
| Pin 26 | BUSY — Output - high during conversion |
| Pin 27 | VCC — +5 V digital supply |
| Pin 28 | NC — Not connected |
Aplicaciones típicas
LTC1605-2CN#PBF es adecuado para 6 aplicacións: Industrial PLC Analog Input Module, Process Control Data Acquisition Board, Precision Instrumentation Front End, Multichannel Multiplexed Acquisition System, Medical Monitoring Signal Digitizer, Factory Automation Sensor Module.
Industrial PLC Analog Input Module
The LTC1605-2 is ideally suited to industrial PLC analog input modules that accept ±4 V bipolar sensor signals such as 4-20 mA current-loop receivers biased around ground. Its integrated 4.096 V reference eliminates the need for an external precision reference, while the 55 mW dissipation allows fanless operation inside sealed PLC enclosures. The 100 ksps throughput supports multiplexed acquisition of 8 to 16 channels at per-channel settling windows of 10 µs to 100 µs. The parallel 16-bit data interface connects directly to a host MCU or FPGA's data bus, simplifying BOM and firmware.
Recomendado
Process Control Data Acquisition Board
In process-control data-acquisition boards, the LTC1605-2 serves as a back-end ADC with the bipolar input range accommodating thermocouple amplifiers, strain-gauge bridges, and other industrial transducers that swing around a common-mode voltage. Its integrated sample-and-hold and trimmed internal clock remove the need for an external track-and-hold and an ADC clock source, reducing board area. The 16-bit no-missing-codes resolution preserves measurement fidelity for control-loop feedback. Designers should place a 2.2 µF REF bypass capacitor and a ground plane under the analog section for 16-bit noise performance.
Recomendado
Precision Instrumentation Front End
The LTC1605-2 fits precision instrumentation front ends that digitize bipolar analog signals from strain-gauge sensors, weighing scales, and laboratory instrumentation. The 16-bit resolution, ±2.5 LSB INL typical, and integrated low-noise reference allow measurement systems to reach the datasheet's specified DC accuracy without external calibration. The 100 ksps throughput is well-matched to multiplexed analog front ends, and the parallel data interface simplifies synchronizing multiple converters when channel-count scaling is required.
Recomendado
Multichannel Multiplexed Acquisition System
For multichannel analog acquisition systems, the LTC1605-2 handles multiplexed input signals from a flying-capacitor or active multiplexer such as the ADG1409. Each channel settles at 16-bit accuracy within approximately 10 µs, and the deterministic SAR conversion completes in a fixed window without pipeline latency - critical for phase-aligned multi-channel measurements. The integrated 5V single-supply and 55 mW dissipation simplify thermal and supply budget planning for dense multiplexed designs.
Recomendado
Medical Monitoring Signal Digitizer
The LTC1605-2 is suitable for medical monitoring devices that require 16-bit resolution at moderate sampling rates, such as patient monitoring modules, diagnostic analyzers, and laboratory instrumentation. Its bipolar ±4 V input range supports ECG and EEG front-end amplifiers that swing above and below ground, while its integrated reference and clock shorten time-to-market for IEC 60601 compliance projects. Designers should pair it with an isolation amplifier for patient-side protection and adhere to EMI/ESD limits per IEC 60601-1.
Recomendado
Factory Automation Sensor Module
The LTC1605-2 is a good fit for factory-automation sensor modules that digitize analog process variables from temperature, pressure, and flow transmitters over 4-20 mA current loops. The ±4 V bipolar input can directly accept the demultiplexed current-loop voltage drop while a common-mode bias handles ground-reference issues. The 100 ksps throughput supports fast update rates for closed-loop control, and the parallel digital interface allows direct connection to a host MCU or DSP without serial-port overhead.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para LTC1605-2CN#PBF — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | LTC1605-1CN#PBF | LTC1605-2IN#PBF |
|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-PDIP | 28-PDIP - same | 28-PDIP - same |
| Resolution | 16-bit | 16-bit | 16-bit |
| Sampling Rate | 100 ksps | 100 ksps | 100 ksps |
| Input Range | ±4 V bipolar | 0 V to 4 V unipolar | ±4 V bipolar |
| Operating Temperature | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) | -40 °C to +85 °C (industrial) |
| Internal Reference | Yes (4.096 V) | Yes (4.096 V) | Yes (4.096 V) |
| Power Dissipation | 55 mW | 55 mW | 55 mW |
| Mounting Type | Through-Hole | Through-Hole | Through-Hole |
Diferenciadores clave
- True ±4 V bipolar input on a single 5 V supply (frente a LTC1605-1CN#PBF)
- Integrated 4.096 V reference and trimmed internal clock (frente a Generic 16-bit SAR ADC competitors)
- Commercial temperature grade for cost-optimized designs (frente a LTC1605-2IN#PBF)
Notas de diseño
Decouple the VCC pin with a 10 µF tantalum (or polymer) capacitor in parallel with a 0.1 µF ceramic placed as close to pin 5 as physically possible. The internal ADC analog and digital supply are both rated at 5 V; the device draws 55 mW typical at full throughput. Inadequate decoupling introduces linearity and noise errors that can exceed 1 LSB in 16-bit code. Estimated: at 100 ksps the supply current is approximately 11 mA, so the VCC rail must remain above 4.75 V under worst-case load.
Place a 2.2 µF (or larger) capacitor between the VREF pin and AGND as close to pin 1 as possible. The internal 4.096 V reference is the source for conversion accuracy, and any reference noise or settling ripple directly appears as gain error or code-edge noise in the conversion result. Use a quiet analog ground plane (no return currents from digital logic) and route the digital DB0-DB15, BUSY, CS, RD traces perpendicular to the analog input and reference traces to minimize digital-to-analog coupling.
Because the analog input is bipolar up to ±4 V, the AIN+ and AIN- pins can swing 8 V relative to ground. The driver must sink and source current via the input ESD diodes without clamping; use a series resistor (typically 100 Ω) at each input to limit transient currents from source-capacitance discharge. The input sample-and-hold presents a transient load at the start of each acquisition - verify with the chosen instrumentation amplifier or multiplexer that this transient settles within the acquisition window.
Do not omit the 2.2 µF REF bypass capacitor - several reported failure modes are traced to missing or insufficient REF decoupling that causes INL and noise errors well beyond the datasheet. Do not leave the CS pin floating - it must be driven low to start a conversion. Do not exceed the absolute maximum analog input of ±15 V without external ESD protection; bipolar signals up to the ADC input range are fine but out-of-range transients can destroy the device.
Información de cumplimiento
#PBF suffix denotes Pb-free / RoHS-compliant per ADI part-number convention. AEC-Q100 not applicable - this is a commercial-grade part; choose the LTC1605-2IN#PBF industrial variant if extended temperature is required.
