ADS7808UB/1K - 12-Bit 100kHz Serial SAR ADC | Texas Instruments
MPN: ADS7808UB/1K ✓ Hoạt độngADS7808UB/1K Tóm tắt
An SAR ADC is a successive-approximation-register analog-to-digital converter: it compares the sampled input against a binary-weighted internal DAC bit-by-bit in N clock cycles (here N = 12), producing a deterministic, low-latency conversion ideal for multiplexed data-acquisition, motor control feedback loops, and DSP front-ends. Within the broader taxonomy, the ADS7808UB sits at: ADC -> data converter -> signal-chain IC -> semiconductor. The 72 dB SINAD and ±½ LSB INL/DNL specifications confirm true 12-bit performance with no missing codes.
Key features include 100 kHz throughput, 72 dB SINAD at 45 kHz input, ±½ LSB integral and differential nonlinearity, six factory-trimmed input ranges (0–5 V, 0–10 V, ±5 V, ±10 V, etc.), serial data output that can be clocked from the internal oscillator or an external DSP clock, and a hardware SYNC pulse that simplifies frame alignment to standard serial ports. The reference is internal by default but may be overdriven externally for multi-channel ratio-metric systems.
Typical applications include industrial process-control front-ends, multi-channel data-acquisition boards, DSP-based vibration and motor-control signal chains, portable instrumentation, and any pin-compatible upgrade path from the older ADS7808. When designing, note that the device is pin-compatible with the 16-bit ADS7809, providing an upgrade route without PCB rework, and that the internal reference settling time influences acquisition timing at higher throughput rates.
Bộ thay thế dễ dàng lắp đặt cho ADS7808UB/1K — 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 ADS7808UB/1K (cùng hình factor và footprint) — khác nhau ở Package, Sampling Rate, Operating Temperature, Architecture, Number of Input Channels.
ADS7808UB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS7808U
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7809U
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7813UB/1K
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Xem tài liệu →ADS7808UB/1K Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Architecture | SAR (Successive Approximation Register) |
| Tỷ lệ lấy mẫu | 100 kHz (10 µs conversion) |
| Number of Input Channels | 1 (single-ended, 6 software-selectable ranges) |
| SINAD | 72 dB at 45 kHz input |
| INL (Bất định tích hợp) | ±1/2 LSB (max) |
| DNL (Differential Nonlinearity) | ±1/2 LSB (max) |
| Điện áp cung cấp | +5 V (single supply) |
| Power Dissipation | 100 mW (max) |
| Data Interface | Serial (SPI / DSP-compatible, internal or external clock) |
| Reference | Internal 2.5 V (external overdrive supported) |
| Input Ranges | 0-5 V, 0-10 V, ±5 V, ±10 V (six factory-trimmed ranges) |
| Hộp | 20-pin SOIC (DW) |
| Nhiệt độ hoạt động | -40 °C to +85 °C (industrial) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 (unlimited) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân ADS7808UB/1K
| Chân 1 | VIN — Analog input |
| Chân 2 | AGND — Analog ground |
| Chân 3 | REF — Reference input/output (internal 2.5 V) |
| Chân 4 | VANA — +5 V analog supply |
| Chân 5 | GND — Digital ground |
| Chân 6 | VDIG — +5 V digital supply |
| Chân 7 | RANGE — Input range select |
| Chân 8 | CS — Chip select (active low) |
| Chân 9 | SYNC — Frame synchronization output |
| Chân 10 | NC — Not connected (per datasheet) |
| Chân 11 | DCLOCK — Data clock input/output |
| Chân 12 | DOUT — Serial data output |
| Chân 13 | BUSY — Conversion in progress (active high) |
| Chân 14 | TAG — Tag input for channel identification |
| Chân 15 | R1IN — Range select bit 1 input |
| Chân 16 | R0IN — Range select bit 0 input |
| Chân 17 | BIP — Bipolar / unipolar select |
| Chân 18 | NC — Not connected (per datasheet) |
| Chân 19 | NC — Not connected (per datasheet) |
| Chân 20 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
ADS7808UB/1K phù hợp cho 6 Áp dụngs: Industrial Process Control Data Acquisition, DSP-Based Motor Control Feedback, Portable Test & Measurement Instrumentation, Multi-Channel Data Acquisition Systems (DAS), Medical Patient Monitoring Front-Ends, Renewable Energy / Power Inverter Telemetry.
Industrial Process Control Data Acquisition
The ADS7808UB/1K fits 4-20 mA-derived and high-level industrial signal acquisition because its six factory-trimmed input ranges (0-5 V, 0-10 V, ±5 V, ±10 V) accept standard industrial signal levels directly. Placed between a sensor front-end and an MCU/DSP, its 72 dB SINAD at 45 kHz input and ±½ LSB INL/DNL guarantee 12-bit accurate readings on multiplexed temperature, pressure, and flow channels; compared with a 16-bit ADC like ADS7809, designers save cost and code complexity while keeping pin-compatibility for future upgrades.
Được đề xuất
DSP-Based Motor Control Feedback
With 10 µs conversion time and a hardware SYNC pulse, the ADS7808UB/1K streams feedback values into TI C2000 DSPs and similar controllers for closed-loop motor control. The serial interface can be clocked by the DSP, eliminating external glue logic and timing jitter. Compared with parallel-output ADCs, the 20-pin SOIC serial interface saves board area and pins, and 100 kHz throughput is sufficient for field-oriented control (FOC) current-sense sampling at typical PWM frequencies.
Được đề xuất
Portable Test & Measurement Instrumentation
The ADS7808UB/1K's +5 V single-supply operation and 100 mW maximum dissipation are well-matched to handheld oscilloscopes, bench DMMs, and portable data loggers where power budget is constrained. Six input ranges cover both bench-top signal levels (10 V) and low-level transducer outputs without external scaling. The internal reference eliminates a second supply rail, and the SOIC-20 package is easy to hand-prototype - the ADS7808UB is a long-standing workhorse for compact instruments.
Được đề xuất
Multi-Channel Data Acquisition Systems (DAS)
Although single-channel, the ADS7808UB/1K's 100 kHz throughput lets a multiplexer front-end (e.g., 16:1 MUX) scan industrial DAS boards with >6 kHz per-channel sample rate - sufficient for vibration monitoring and process control loops. The 72 dB SINAD yields effective-number-of-bits (ENOB) ≈11.7 at 45 kHz, comparable to dedicated DAS ICs. Designers moving from a single-channel ADC to a 4-channel integrated ADC (ADS6424) can keep the ADS7808UB/1K on auxiliary or backup channels for cost.
Được đề xuất
Medical Patient Monitoring Front-Ends
The ADS7808UB/1K's industrial -40 °C to +85 °C range and ±½ LSB linearity suit ECG, SpO2, and infusion-pump front-ends where 12-bit resolution at 100 kHz adequately oversamples physiological signals (typically <1 kHz bandwidth). The serial interface simplifies isolation barrier implementation - only a few digital lines need opto-couplers, easing IEC 60601-1 compliance. Compare with the ADS131A04 for higher-precision modern medical ADC replacement designs.
Được đề xuất
Renewable Energy / Power Inverter Telemetry
Solar inverter and battery-monitoring telemetry boards use the ADS7808UB/1K for DC-bus voltage and current-sensor digitization at 100 kHz, providing margin above typical 10-20 kHz control loops. The internal reference reduces BOM, and pin-compatibility with the 16-bit ADS7809U supports product-line SKU splits between cost-optimized 12-bit and precision 16-bit variants using a single PCB layout - a common power-converter design pattern.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS7808UB/1K — 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 | ADS7808UB | ADS7808U | ADS7809U | ADS7813UB/1K |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-pin SOIC (DW) | 20-pin SOIC (DW) - same | 20-pin SOIC (DW) - same | 20-pin SOIC (DW) - same | 20-pin SOIC (DW) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 16 bits | 12 bits |
| Sampling Rate | 100 kHz | 100 kHz | 100 kHz | 100 kHz | 28 kHz |
| SINAD | 72 dB at 45 kHz | 72 dB | 72 dB | 84 dB | 72 dB |
| Supply Voltage | +5 V | +5 V | +5 V | +5 V | +5 V |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | 0 °C to +70 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Interface | Serial (SPI/DSP) | Serial | Serial | Serial | Serial |
Bảo phân biệt quan trọng
- Pin-compatible 16-bit upgrade path on the same footprint (vsADS8508)
- Six factory-trimmed input ranges vs typical single-range ADCs (vsADS7813UB/1K)
- Higher throughput at identical 12-bit accuracy (vsADS7813UB/1K)
Ghi chú thiết kế
Estimated: separate analog and digital ground planes with a single-point stitch under the ADS7808UB/1K to avoid digital switching noise coupling into the analog input. Decouple VANA and VDIG with 10 µF tantalum + 0.1 µF ceramic close to the pins, and route the analog input trace as a guarded differential pair on a separate analog layer.
Use the ADS7808UB/1K's BUSY pin (active high) to gate the DSP serial port; reading DOUT while BUSY is high can corrupt the conversion. The SYNC output pulse simplifies frame alignment - tie it to the DSP frame-sync input rather than relying on software timing.
Do not exceed the absolute maximum analog input voltage (±25 V transients). When switching between input ranges, allow at least one full conversion (10 µs) for the internal capacitive DAC to settle - reading immediately after a RANGE change gives erroneous codes. The internal reference needs a 10 µF bypass cap at the REF pin to meet 72 dB SINAD at full throughput.
Thông tin tuân thủ
RoHS/REACH compliance confirmed by TI product page and DigiKey listing. Not AEC-Q100 qualified - this is an industrial-grade part. Halogen-free status not stated in the verified data.
