ADS8345NB - 16-Bit 8-Channel 100-kSPS ADC | Texas Instruments
MPN: ADS8345NB ✓ Hoạt độngADS8345NB Tóm tắt
A sampling ADC is a mixed-signal integrated circuit that samples an analog voltage and converts it into a digital code. The ADS8345 belongs to the SAR ADC hierarchy, within analog-to-digital converters and data-converter ICs. Its multiplexed architecture lets one converter measure multiple sensors or signal channels through a synchronous serial interface, reducing component count in industrial controls, instrumentation, and test equipment.
Key features include 16-bit resolution, a maximum conversion rate of 100 kSPS, eight single-ended or four differential inputs, and a selectable reference range from 500 mV to VCC/2. The differential input range of ±VREF supports bipolar measurement without separate input conditioning. Shutdown mode reduces consumption when the acquisition system is idle, while typical power dissipation is 8 mW at 100 kSPS with a 5 V supply.
Internally, the converter uses a successive-approximation architecture and a synchronous serial interface for transferring conversion results. The ADS8345 accepts an external reference, allowing the system designer to establish the measurement scale and common-mode behavior for the analog front end. The 208 mil SSOP-20 package is intended for conventional surface-mount PCB assembly and provides a pin-compatible path with compatible Texas Instruments ADS834x devices.
Typical applications include data-acquisition systems, industrial process control, test and measurement equipment, battery-powered instrumentation, and multichannel sensor interfaces. The 100-kSPS throughput is appropriate for monitoring slowly changing process variables and general-purpose analog measurement rather than high-frequency waveform capture.
For a robust design, follow the manufacturer’s recommended reference, bypass-capacitor, and analog-ground layouts. The input source impedance and acquisition time must be checked together because the selected channel is connected to the internal sampling network for only part of each conversion cycle. Signal conditioning should limit voltage and current excursions to the ADC’s absolute-maximum ratings.
This product page consolidates the key electrical specifications, package information, pin-compatible alternatives, application guidance, and engineering notes needed to evaluate the ADS8345NB for a precision multichannel acquisition design.
Bộ thay thế dễ dàng lắp đặt cho ADS8345NB — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ADS8345NB (cùng hình factor và footprint) — khác nhau ở Input Type, Typical Power Dissipation, Resolution, Architecture, Reference Voltage Range.
ADS8344N
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7844N
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8346
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8347
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8345N/1K
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8345NB Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bit |
| Maximum Conversion Rate | 100 kSPS |
| Single-Ended Input Channels | 8 channels |
| Differential Input Channels | 4 channels |
| Architecture | Successive-approximation SAR |
| Supply Voltage Range | 2.7 V to 5 V |
| Signal-to-Noise and Distortion | 85 dB SINAD |
| Reference Voltage Range | 500 mV to VCC/2 |
| Differential Input Range | ±VREF |
| Typical Power Dissipation | 8 mW at 100 kSPS and 5 V supply |
| Loại giao diện | Synchronous serial interface |
| Package Type | 20-pin SSOP, 208 mil |
| Package Pin Count | 20 pins |
| Kiểu lắp đặt | Surface mount |
| Reference Source | External reference |
| Power-Down Function | Available |
| Input Type | Unipolar single-ended or bipolar differential |
Hướng dẫn cấu hình chân ADS8345NB 20 pins
Cấu hình chân cho ADS8345NB (20 pins gói). Thành phần số hiệu này có chân đầu vào, đầu ra và nguồn cung cấp. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết cấu hình chân bù, bù trừ và chân kích hoạt. Hoàn hảo cho điều kiện tín hiệu và mạch khuếch đại.
Không có dữ liệu chân cụ thể sẵn có cho ADS8345NB.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
ADS8345NB phù hợp cho 6 Áp dụngs: Multichannel Data Acquisition, Industrial Process Control, Test and Measurement Equipment, Battery-Powered Sensor Interfaces, Battery Monitoring and Protection, General-Purpose Embedded Measurement.
Multichannel Data Acquisition
The ADS8345NB fits multichannel data-acquisition systems that require accurate conversion of several sensor outputs without using one ADC per channel. Its multiplexer supports eight single-ended or four differential inputs, while 16-bit resolution provides 65,536 possible digital codes across the selected reference range. At up to 100 kSPS, the converter can continuously refresh a group of slowly varying measurements. Place the device behind suitable analog switches or buffers when the sources require channel isolation, scaling, or protection, and use the synchronous serial interface to transfer each conversion result to the controller.
Được đề xuất
Industrial Process Control
The ADS8345NB is suitable for industrial process-control loops that monitor pressure, temperature, position, or current sensors. Eight single-ended inputs reduce the analog-channel count, and differential operation supports four balanced channels with a ±VREF input range. Its 100-kSPS maximum rate provides more than enough throughput for typical process variables while its 16-bit resolution supports fine measurement granularity. At the system level, add overvoltage, surge, and overcurrent protection for field wiring, and isolate external circuitry when the converter is connected to hazardous or high-energy equipment.
Được đề xuất
Test and Measurement Equipment
The ADS8345NB can serve as the measurement front end in programmable instruments and automated test equipment. Its 100-kSPS conversion rate is appropriate for slowly changing voltages, calibration outputs, and general-purpose bench measurements, while the 20-pin SSOP package supports conventional surface-mount assembly. The external reference allows the instrument designer to establish a traceable measurement scale. Use buffered inputs and carefully controlled grounding when measuring low-level signals, because source impedance, reference noise, and digital coupling can otherwise limit the practical accuracy below the converter’s 16-bit resolution.
Được đề xuất
Battery-Powered Sensor Interfaces
The ADS8345NB is appropriate for portable and battery-powered sensor interfaces because it operates from 2.7 V to 5 V and includes a shutdown function. Its typical 8 mW dissipation at 100 kSPS with a 5 V supply provides a baseline for system-level power budgeting, although lower conversion rates can reduce average consumption. The device can monitor several low-bandwidth sensor channels through its multiplexer and wake the controller when conversion data is ready. Energy optimization should include disabling unused channels at the analog front end, shortening serial transactions, and placing the ADC into shutdown whenever continuous monitoring is unnecessary.
Được đề xuất
Battery Monitoring and Protection
The ADS8345NB can monitor multiple battery-cell or power-rail voltages in a battery-management system where 16-bit resolution and flexible single-ended or differential input selection are useful. The converter samples one selected input at a time, allowing a controller to sequence measurements without operating eight dedicated converters. Differential channels can reject common-mode voltage when cell taps share a shifting reference point. The analog inputs must remain within the device’s operating limits during charging and discharge, so include scaling, filtering, and overvoltage protection rather than connecting raw high-energy battery nodes directly.
Được đề xuất
General-Purpose Embedded Measurement
The ADS8345NB suits embedded controllers that acquire several analog quantities for diagnostics, configuration, or feedback control. Its synchronous serial interface supports compact connections to microcontrollers and digital signal processors, while the single 2.7 V to 5 V supply operation simplifies system integration. The 100-kSPS rate is particularly useful for supervisory measurements that do not require waveform-grade sampling. Designers should calculate the required acquisition time for the highest source impedance, allow the input to settle between channel selections, and use the manufacturer’s timing values to avoid sampling during the previous conversion’s acquisition interval.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS8345NB — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | ADS8344N | ADS7844N | ADS8346 | ADS8347 | ADS8345N/1K |
|---|---|---|---|---|---|---|
| Package | SSOP-20 (208 mil) | SSOP-20 (208 mil) | SSOP-20 (208 mil) | SSOP-20 (208 mil) | SSOP-20 (208 mil) | SSOP-20 (208 mil) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
Bảo phân biệt quan trọng
- External-reference flexibility (vsADS7844N)
- Full eight-channel single-ended capacity (vsADS8346)
- Documented pin-compatible upgrade path (vsADS8344N)
Ghi chú thiết kế
Treat the analog input and reference nets as sensitive precision paths. Place the external reference and its bypass capacitor close to the corresponding pins, keep the input routes compact, and route serial clock, data, and chip-select traces away from the analog inputs. Connect analog return current to the quiet ground region and follow the manufacturer’s grounding topology. This separation reduces conversion-error coupling that could otherwise limit the usable resolution of the 16-bit converter.
Verify source impedance and acquisition time before using high-value precision resistors in the input path. The selected multiplexer channel must settle during the acquisition interval, so a theoretically valid input voltage can still produce an inaccurate result if the source cannot charge the internal sampling network quickly enough. Use the Texas Instruments acquisition-time table and include settling time in the channel-switching sequence; add a buffer when the sensor or divider cannot meet the required bandwidth.
Budget the converter around its stated 8 mW typical dissipation at 100 kSPS with a 5 V supply, then add supply-regulator loss, reference current, interface activity, and external analog circuitry. Place the required bypass capacitors at the supply and reference pins with short, direct return paths. Use shutdown between acquisition bursts when the average sampling rate is low, and confirm the wake and settling sequence before the first valid conversion.
Thông tin tuân thủ
The ADS8345 is a data-converter IC rather than an automotive-qualified device; no AEC-Q100 qualification is indicated for ADS8345NB.
