ADS7844E - 12-Bit 8-Channel 200 kHz ADC | Texas Instruments
MPN: ADS7844E ✓ Hoạt độngADS7844E Tóm tắt
A sampling ADC is an analog-to-digital converter that acquires an input voltage through a sample-and-hold circuit and converts it into a digital code. The ADS7844E belongs to the ADC > data converter > integrated circuit hierarchy and is designed for compact embedded systems requiring multiple analog measurements, controlled serial output, and low power consumption. Its reference voltage can vary from 100 mV to VCC, with a corresponding input range of 0 V to VREF.
The device provides 12-bit resolution, eight single-ended or four differential inputs, and conversion throughput up to 200 kHz. Its synchronous serial interface supports communication with a microcontroller or other digital controller, while shutdown mode reduces power dissipation when conversion activity is not required. The single-supply operation and selectable reference range make the converter useful in industrial control, instrumentation, data acquisition, and embedded analog monitoring systems.
The ADS7844E uses a sampling architecture rather than a continuous-time delta-sigma or pipeline architecture. This supports relatively high throughput for a multiplexed converter while keeping the device suitable for low-power embedded designs. Input selection, reference handling, serial timing, and acquisition control are managed through the device interface and external circuitry. The application engineer must account for the settling time of the sample-and-hold network when multiplexing channels at high conversion rates.
Typical applications include touch-panel and resistive input scanning, industrial sensor interfaces, programmable gain control systems, battery-powered instrumentation, and factory automation modules. The 8-channel input arrangement is useful when several analog quantities must be measured with one converter. The 3 mW typical dissipation figure makes the part attractive for embedded systems where overall power budget and board area are constrained.
Designers should pay close attention to the reference voltage, analog input range, source impedance, acquisition timing, and serial-interface wiring. Input and reference bypassing, grounding, signal conditioning, and digital return-current management can materially affect conversion accuracy. The 20-lead SSOP package also requires adequate lead clearance and careful assembly planning during manual inspection or rework.
This product summary combines manufacturer identification, distributor package information, ADS7844 feature descriptions, and cross-reference findings. It distinguishes verified ADS7844E characteristics from unavailable detailed electrical, pricing, and pin-assignment data so engineers can make a traceable initial selection and then confirm the complete operating limits in the official Texas Instruments datasheet.
Bộ thay thế dễ dàng lắp đặt cho ADS7844E — 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 ADS7844E (cùng hình factor và footprint) — khác nhau ở Package, Architecture, Reference Voltage Range, Resolution, RoHS Status.
ADS7844N
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX14701EWC+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7844E Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bit |
| Input Channels | 8 single-ended or 4 differential |
| Maximum Throughput Rate | 200 kS/s |
| Architecture | SAR sampling ADC |
| Output Interface | Synchronous serial interface |
| Supply Type | Single supply |
| Typical Supply Voltage | +5 V |
| Reference Voltage Range | 100 mV to VCC |
| Phạm vi điện áp đầu vào | 0 V to VREF |
| Typical Power Dissipation | 3 mW at 200 kHz throughput and +5 V supply |
| Shutdown Mode | Yes |
| Hộp | 20-lead SSOP |
| Kiểu lắp đặt | Surface mount |
| Analog Input Type | Single-ended or differential |
Hướng dẫn cấu hình chân ADS7844E 20-lead ssop
Cấu hình chân cho ADS7844E (20-lead ssop 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 ADS7844E.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
ADS7844E phù hợp cho 6 Áp dụngs: Industrial Sensor Acquisition, Resistive Touch Panel Control, Programmable Instrumentation, Factory Automation Control, Battery-Powered Data Acquisition, Portable Environmental Monitoring.
Industrial Sensor Acquisition
The ADS7844E fits industrial sensor acquisition because its eight single-ended inputs can monitor several analog sensors, while four differential channels can reject common-mode noise when required. Texas Instruments specifies 12-bit resolution, 200 kS/s throughput, and a synchronous serial interface. Place the converter behind suitable input conditioning and protect every channel against transients. The 100 mV to VCC reference range permits scaling, although the selected VREF directly determines the input measurement span. At 200 kS/s, verify that each source has settled before conversion and confirm noise and linearity limits in the official datasheet.
Được đề xuất
Resistive Touch Panel Control
The ADS7844E is applicable to resistive touch-panel control because it can scan multiple single-ended inputs through a synchronous serial interface and supports a 200 kS/s conversion rate. Its eight input channels can represent panel coordinates, pressure, or auxiliary controls when configured with the appropriate resistor network. The 12-bit code width provides 4096 nominal levels, while the reference range of 100 mV to VCC supports different excitation schemes. Account for panel resistance, switch resistance, sampling time, and ground bounce when calculating the usable scan rate.
Được đề xuất
Programmable Instrumentation
The ADS7844E supports programmable instrumentation where several precision analog quantities must be converted into a digital stream. Its multiplexed SAR architecture reaches 200 kS/s and offers eight single-ended or four differential configurations, making it useful for controlled measurement front ends. The reference voltage may range from 100 mV to VCC, allowing the analog range to be matched to the sensor and amplifier chain. For laboratory or field instrumentation, use a low-noise reference and verify the reference-current requirements, source settling, and acquisition timing before operation.
Được đề xuất
Factory Automation Control
The ADS7844E can serve as the analog measurement engine in factory automation modules that monitor pressure, position, level, or analog sensor outputs. Eight single-ended inputs reduce the number of converters needed, and differential operation is available for four channels where common-mode interference is significant. Its 200 kS/s SAR throughput is more than adequate for many supervisory and control loops, while the typical 3 mW dissipation at 200 kHz and +5 V supports compact embedded electronics. Industrial qualification limits must be checked separately from the basic ADC functionality.
Được đề xuất
Battery-Powered Data Acquisition
The ADS7844E is useful in battery-powered data loggers because its shutdown mode can reduce consumption between measurement bursts, and the verified typical dissipation is only 3 mW at 200 kHz with a +5 V supply. Eight single-ended inputs allow multiple sensors to share one converter. A duty-cycled controller can enable or configure the converter only when samples are required, reducing energy use without changing the serial data format. Actual battery life depends on the complete supply architecture, reference behavior, wake-up timing, and leakage current, none of which are quantified in the supplied excerpts.
Được đề xuất
Portable Environmental Monitoring
The ADS7844E fits portable environmental-monitoring devices that combine several analog sensor inputs with a low-power digital controller. Four differential channels can support bridge or ratiometric sensors where common-mode noise rejection is important, while eight single-ended channels accommodate temperature, humidity, light, and status inputs. The 12-bit resolution and 200 kS/s peak conversion rate cover many slow environmental measurements. Because the device is multiplexed, the sensor output must settle within the acquisition interval, and sensor excitation strategy can affect power consumption and measurement accuracy.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS7844E — 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 | ADS7844N | MAX147 |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Maxim Integrated |
| Package | 20-lead SSOP | 20-lead SSOP | 20-lead SSOP |
Bảo phân biệt quan trọng
- High channel count for a compact multiplexed converter (vsMAX147)
- Verified 200 kS/s conversion throughput (vsMAX147)
- Adjustable reference range (vsADS7844N)
Ghi chú thiết kế
The verified typical dissipation is 3 mW at 200 kHz throughput with a +5 V supply. Use shutdown mode during long inactive periods, but confirm the shutdown current and required wake-up interval in the official datasheet. Place local bypass capacitors close to the supply and reference pins, and route the reference return separately from noisy digital return paths to avoid introducing reference error.
Because the ADS7844E multiplexes eight input channels, the selected source must settle within the available acquisition interval. Estimate the required acquisition time from the source impedance, the 100 mV-to-VCC reference range, and the required conversion accuracy, then compare that requirement with the 200 kS/s maximum throughput. Long sensor cables or high-impedance dividers may require lower conversion rates, longer acquisition times, or dedicated buffers.
Keep analog input and reference traces short, isolate them from high-current switching paths, and provide a low-impedance ground reference. The 20-lead SSOP footprint has relatively narrow lead spacing, so verify board design rules, solder-paste volume, assembly profile, and inspection access. Avoid routing serial clock and data returns directly beneath sensitive input nets where shared impedance could couple converter activity into the analog measurement.
Thông tin tuân thủ
The supplied verified excerpts do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The MAX147 cross-reference excerpt states a 40°C to +85°C operating range, but no qualification claim was provided for ADS7844E.
