ADS8345N - 16-Bit 100-kSPS 8-Channel SAR ADC | Texas Instruments
N.º de pieza: ADS8345N ✓ ActivoADS8345N Descripción general
An ADC is a mixed-signal semiconductor that converts continuously varying analog voltages into numerical values for processing, storage, or control. A SAR ADC performs conversion by successively testing weighted bit decisions against an internal comparator. The ADS8345 belongs to the ADC, data-converter IC, signal-chain IC, and broader semiconductor hierarchy, combining analog input conditioning, a sampling multiplexer, digital conversion, and a serial output interface.
Key features include 16-bit resolution, a maximum conversion rate of 100 kSPS, eight multiplexed single-ended inputs or four differential inputs, and operation from 2.7 V to 5 V. The 85 dB SINAD specification provides a compact indication of conversion performance, while the integrated multiplexer reduces the number of external analog switches required for multi-channel measurements. The four-wire interface separates chip select, serial clock, data input, and data output functions.
The ADS8345N uses a synchronous serial interface compatible with several microprocessor families. Its digital inputs are overvoltage tolerant to +5.5 V regardless of the supply voltage, which can simplify connections between lower-voltage converters and systems using higher-voltage digital signaling. The converter is intended for single-supply operation and is offered in SSOP-20 and QSOP-20 package configurations, with the N ordering identifying the SSOP-20 version.
Typical applications include data acquisition, test and measurement equipment, industrial process control, battery-powered portable instruments, personal digital assistants, and multichannel data loggers. The serial interface also supports cost-effective isolation when the ADC is placed across an isolation barrier. Differential operation is particularly useful when the measured signal requires rejection of common-mode noise.
Designers should pay attention to input range, reference voltage, acquisition time, source impedance, and serial-interface timing. The selected analog range must match the sensor or transducer output, while the reference and external network must preserve the converter's 16-bit performance. Layout should keep analog and digital return paths controlled and place input and reference components close to their associated pins.
This page combines the manufacturer's core electrical characteristics with practical application guidance, pin-level connection information, and a focused comparison of same-family pin-compatible options. It is intended to help engineers select, implement, and source the ADS8345N for compact multichannel measurement systems.
Alternativas directas para ADS8345N — 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 ADS8345N (mismo factor de forma y huella) — difiere en Input Type, Mounting Type, Signal-to-Noise and Distortion.
ADS7844N
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →ADS8344N
✅ Sustitución directa ⚠️ Especificaciones sin verificarConsulte el precio
Ver hoja de datos →ADS8346N
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ADS8347N
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
ADS8345N/1K
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ADS8345N Valores máximos y características eléctricas
| ADC Type | Successive-approximation-register SAR ADC |
| Resolución | 16 bit |
| Conversion Rate | 100 kSPS |
| Input Configuration | 8 single-ended inputs or 4 differential inputs |
| Input Type | Fully differential |
| Supply Voltage Range | 2.7 V to 5 V |
| Signal-to-Noise and Distortion | 85 dB SINAD |
| Serial Interface | 4-wire synchronous serial interface |
| Digital Input Overvoltage Tolerance | +5.5 V regardless of VCC |
| Rango de temperatura de funcionamiento | -40 °C to +85 °C |
| Encapsulado | 20-pin SSOP |
| Tipo de montaje | Surface mount |
| Input Multiplexer | Onboard 8-channel multiplexer |
| Applications | Data acquisition, test and measurement, and industrial process control |
| Isolation Support | 4-wire serial interface suitable for low-cost isolated data acquisition |
Configuración de pines de ADS8345N
| Pin 1 | REF+ — Positive external reference input |
| Pin 2 | A1+ — Positive input for analog channel 1 |
| Pin 3 | A1- — Negative input for analog channel 1 |
| Pin 4 | A2+ — Positive input for analog channel 2 |
| Pin 5 | A2- — Negative input for analog channel 2 |
| Pin 6 | A3+ — Positive input for analog channel 3 |
| Pin 7 | A3- — Negative input for analog channel 3 |
| Pin 8 | AGND — Analog ground |
| Pin 9 | DGND — Digital ground |
| Pin 10 | CS — Active-low chip-select input |
| Pin 11 | SCLK — Serial clock input |
| Pin 12 | DOUT — Serial data output |
| Pin 13 | DIN — Serial data input |
| Pin 14 | REF- — Negative external reference input |
| Pin 15 | A4+ — Positive input for analog channel 4 |
| Pin 16 | A4- — Negative input for analog channel 4 |
| Pin 17 | A5+ — Positive input for analog channel 5 |
| Pin 18 | A5- — Negative input for analog channel 5 |
| Pin 19 | A6+ — Positive input for analog channel 6 |
| Pin 20 | A6- — Negative input for analog channel 6 |
Aplicaciones típicas
ADS8345N es adecuado para 6 aplicacións: Multichannel Data Acquisition, Industrial Process Control, Portable Battery Instruments, Test and Measurement Equipment, Isolated Remote Data Acquisition, Battery-Powered Personal Digital Assistants.
Multichannel Data Acquisition
The ADS8345N is well suited to multichannel data-acquisition systems because its onboard multiplexer supports eight single-ended inputs or four differential inputs while maintaining a maximum conversion rate of 100 kSPS. According to the Texas Instruments ADS8345 datasheet, the 16-bit converter delivers 85 dB SINAD from a single 2.7 V to 5 V supply. A microcontroller can select channels through the four-wire serial interface and acquire successive readings without requiring a separate analog multiplexer. Differential pairs are preferable when sensor outputs include significant common-mode noise, while single-ended channels reduce wiring complexity for slowly varying laboratory signals.
Recomendado
Industrial Process Control
The ADS8345N can monitor several analog process variables when the controller needs 16-bit measurement resolution in a compact 20-pin SSOP package. Its eight single-ended inputs support sensor multiplexing, while four differential inputs can monitor current-output or bridge-based transducers. The 100-kSPS conversion rate provides temporal resolution for closed-loop monitoring, and operation from 2.7 V to 5 V supports both 3.3 V and 5 V industrial systems. According to the Texas Instruments ADS8345 datasheet, the -40 °C to +85 °C operating range covers many industrial environments.
Recomendado
Portable Battery Instruments
The ADS8345N suits portable measurement instruments because its 2.7 V to 5 V single-supply operation permits direct use from common battery-derived rails. The onboard eight-channel multiplexer reduces component count, while the 16-bit, 100-kSPS converter supports accurate acquisition of pressure, temperature, position, and biomedical signals. According to the Texas Instruments ADS8345 datasheet, low-power operation and the onboard multiplexer target battery-powered data loggers and personal digital assistants. Duty-cycle the converter and control peripheral loads when minimizing average battery consumption is important.
Recomendado
Test and Measurement Equipment
The ADS8345N can serve as the front-end converter in programmable instruments that require several input channels and 16-bit resolution. Its 100-kSPS rate accommodates moderate-bandwidth waveform capture, sensor bridges, and general-purpose laboratory measurements, while the four-wire synchronous serial interface supports deterministic host-controller communication. According to the Texas Instruments ADS8345 datasheet, the device is specifically identified for test and measurement equipment. Choose the differential configuration when driving signals through balanced fixtures to reduce sensitivity to ground offsets and external interference.
Recomendado
Isolated Remote Data Acquisition
The ADS8345N's four-wire serial interface can help implement an isolated data-acquisition link because serial communication requires fewer wires crossing the isolation boundary than a parallel interface. Place the converter near the remote sensor and transfer data across an optically or digitally isolated serial channel. According to the Texas Instruments ADS8345 datasheet, the interface provides low-cost isolation for remote data acquisition. The design must still address isolated power, grounding, input-range compatibility, and the timing relationship between chip select, serial clock, and serial data on both sides of the barrier.
Recomendado
Battery-Powered Personal Digital Assistants
The ADS8345N is suitable for compact personal digital assistants and portable data loggers that acquire analog information from multiple sensors. Its onboard multiplexer replaces several external analog switches, while operation down to 2.7 V supports low-voltage system rails. According to the Texas Instruments ADS8345 datasheet, the converter is intended for battery-operated personal digital assistants and portable multichannel data loggers. The 16-bit resolution preserves fine amplitude detail, and the 100-kSPS maximum rate supports responsive acquisition without requiring a parallel ADC interface on the system controller.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ADS8345N — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ADS7844N | ADS8344N | ADS8346N | ADS8347N | ADS8345N/1K |
|---|---|---|---|---|---|---|
| Package | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP | 20-pin SSOP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Conversion Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS |
Diferenciadores clave
- Combines eight-channel multiplexing with fully differential input capability (frente a ADS8344N)
- Pin compatibility supports PCB reuse across established TI converter families (frente a ADS7844N)
- Single-supply operation supports compact embedded systems (frente a ADS8347N)
Notas de diseño
Route analog inputs and reference signals away from the serial clock and data outputs, and connect AGND and DGND according to the manufacturer grounding guidance. Place input and reference network components close to the associated pins, minimize loop area, and use a quiet ground path beneath the analog section. Poor return-current routing can add conversion error even when the external resistor and capacitor values match the reference circuit.
Drive the serial interface from a controller with compatible signal levels and account for the digital input overvoltage tolerance rather than treating it as a general-purpose logic-standard requirement. Keep SCLK, CS, DIN, and DOUT traces short, avoid routing them parallel to sensitive analog inputs, and observe acquisition and conversion timing from the datasheet. The four-wire synchronous interface provides deterministic data transfer when chip select, clock, and output timing are configured correctly.
Do not treat the 100-kSPS conversion rate as an unlimited acquisition bandwidth. The usable signal bandwidth depends on input impedance, source settling, acquisition time, reference stability, filter design, and the controller's sampling cadence. Use differential inputs when common-mode rejection is important, and verify that the source can charge the internal sampling network through the selected impedance during each conversion cycle.
Follow the 20-pin SSOP footprint and pin-1 orientation without relocating pins or changing the package variant. Provide short, symmetrical routes for differential channels and keep analog input nodes physically small to minimize parasitic capacitance and susceptibility to injected noise. Verify the decoupling network and reference components against the manufacturer application circuit before releasing the PCB for fabrication.
Información de cumplimiento
The ADS8345 family is ensured over -40 °C to +85 °C. Specific environmental and material compliance declarations are not stated on the cited product pages.
