ADS7807UBE4 - 16-Bit 40kHz SAR ADC, 28-SOIC | Texas Instruments
MPN: ADS7807UBE4 ✓ Hoạt độngADS7807UBE4 Tóm tắt
What is a SAR ADC? A successive-approximation-register analog-to-digital converter is a precision converter type that uses a binary-search algorithm against an internal DAC to resolve an analog input one bit per conversion cycle. SAR ADCs sit in the precision data-converter hierarchy between delta-sigma converters (which trade speed for resolution) and flash converters (which trade resolution for speed), making the SAR topology the workhorse choice for 12-18 bit industrial, instrumentation, and data-acquisition applications where both resolution and deterministic latency matter.
Key features include 35 mW maximum power dissipation, 50 uW power-down mode for battery-friendly duty-cycled operation, 25 us maximum acquisition-and-conversion time (yielding ~40 kSPS throughput), +/-1.5 LSB maximum INL, guaranteed 16-bit no-missing-codes DNL, and 86 dB minimum SINAD with a 1 kHz input. The pin-compatible 12-bit ADS7806 and the older pin-compatible 12-bit ADS7805 allow resolution migration on the same PCB layout.
Internally, the ADS7807 uses a charge-redistribution capacitive DAC array for the SAR conversion, with the internal 2.5V reference driving the binary-weighted capacitor network. The converter offers both a serial (SPI/QSPI/MICROWIRE-compatible) interface and a parallel (8/16-bit) data bus, multiplexed on the same pins, enabling flexible MCU or DSP hook-up without external glue logic. A hardware BYS pin lets the user bypass the internal reference when system-level ratiometric accuracy is required.
Typical applications include industrial process-control analog input modules, multi-channel data-acquisition (DAQ) boards, weigh-scale front ends, pen-trace digitizers, portable medical instrumentation, and precision sensor signal chains. The wide bipolar +/-10V input range also makes the part a strong fit for retrofit of legacy 12-bit +/10V systems that need higher resolution without changing the front-end scaling.
When designing with the ADS7807UBE4, note that the part draws ~7 mA from +5V during conversion and drops to ~10 uA in power-down; therefore, the application logic should gate BUSY/R/C and shutdown for thermal and battery optimization. A 10 uF (minimum) tantalum plus 0.1 uF ceramic at +VANA and +VAND is recommended close to the pins to keep the reference regulator noise off the conversion floor.
This page synthesizes distributor pricing, drop-in alternative analysis, and practical PCB/thermal notes that go well beyond what the manufacturer datasheet reproduces on its own.
Bộ thay thế dễ dàng lắp đặt cho ADS7807UBE4 — 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 ADS7807UBE4 (cùng hình factor và footprint) — khác nhau ở Package, Sampling Rate, Data Interface, Resolution, Supply Voltage.
ADS7807PBG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8507IBDW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8507IDW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS7825U/1K
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD976ANZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7807UBE4 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bits |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 1 single-ended |
| Tỷ lệ lấy mẫu | 40 kSPS (max) |
| Conversion Time (Acquisition + Conversion) | 25 us (max) |
| Input Voltage Ranges | +/-10 V, 0 V to +5 V, 0 V to +4 V |
| Điện áp cung cấp | +5 V single supply |
| Supply Current (active) | 7 mA (typ) / 35 mW (max dissipation) |
| Power-Down Current | 50 uW (max) |
| INL (Bất định tích hợp) | +/-1.5 LSB (max) |
| DNL (Differential Nonlinearity) | 16 bits, no missing codes (guaranteed) |
| SINAD (1 kHz input) | 86 dB (min) |
| Data Interface | Serial (SPI/QSPI/MICROWIRE) or Parallel (8/16-bit) |
| Internal Reference | 2.5 V (internal, BYS pin to bypass) |
| Khoảng nhiệt độ hoạt động | -40C to +85C |
| Hộp | 28-SOIC (DW), 0.295" (7.50 mm) body width |
| Kiểu lắp đặt | Surface Mount |
| Packaging Option (E4 suffix) | Tape and Reel |
| Trạng thái RoHS | Compliant |
Cấu hình chân ADS7807UBE4
| Chân 1 | AIN — Analog input |
| Chân 2 | VANA — Analog +5V supply |
| Chân 3 | VREF — Reference voltage (2.5V nominal, BYS to bypass) |
| Chân 4 | AGND — Analog ground |
| Chân 5 | BYS — Reference bypass/select (tie high for internal ref) |
| Chân 6 | R1 — Input range select bit 1 |
| Chân 7 | R0 — Input range select bit 0 |
| Chân 8 | CS — Chip select (active low) |
| Chân 9 | R/C — Read/Convert control (active low to start conversion) |
| Chân 10 | BUSY — Output, high during conversion |
| Chân 11 | DGND — Digital ground |
| Chân 12 | DB0/DATA — Data bit 0 (LSB) / serial data |
| Chân 13 | DB1 — Data bit 1 |
| Chân 14 | DB2 — Data bit 2 |
| Chân 15 | DB3 — Data bit 3 |
| Chân 16 | DB4 — Data bit 4 |
| Chân 17 | DB5 — Data bit 5 |
| Chân 18 | DB6 — Data bit 6 |
| Chân 19 | DB7 — Data bit 7 |
| Chân 20 | DB8 — Data bit 8 |
| Chân 21 | DB9 — Data bit 9 |
| Chân 22 | DB10 — Data bit 10 |
| Chân 23 | DB11 — Data bit 11 |
| Chân 24 | DB12 — Data bit 12 |
| Chân 25 | DB13 — Data bit 13 |
| Chân 26 | DB14 — Data bit 14 |
| Chân 27 | DB15 — Data bit 15 (MSB) |
| Chân 28 | VAND — Digital +5V supply |
Ứng dụng tiêu biểu
ADS7807UBE4 phù hợp cho 6 Áp dụngs: Industrial Data-Acquisition Front End, Precision Weigh-Scale / Load-Cell Digitizer, Medical Instrumentation Front End, Pen-Trace Digitizer / Chart-Recorder Replacement, Seismic / Vibration Monitoring, Process-Control Loop Input Module.
Industrial Data-Acquisition Front End
The ADS7807UBE4's 16-bit resolution and 40 kSPS throughput make it an excellent fit for industrial multi-channel data-acquisition (DAQ) boards. Its +/-10V bipolar input range (on a single +5V supply) eliminates the need for level-shifting op-amps in many PLC and process-control front ends. According to the TI datasheet, the 86 dB SINAD plus +/-1.5 LSB INL guarantee delivers the dynamic range required for weigh-scale, strain-gauge, and thermocouple-cold-junction-compensation chains. Place the ADC behind a low-leakage MUX and 1kHz RC anti-alias filter, with 10 uF tantalum + 0.1 uF ceramic at each supply pin to prevent reference-modulation noise from coupling into the conversion. Reduces BOM vs delta-sigma alternatives by removing external reference and clock components.
Được đề xuất
Precision Weigh-Scale / Load-Cell Digitizer
Low-noise 16-bit conversion with no-missing-codes DNL makes the ADS7807UBE4 ideal for digitizing load-cell outputs in commercial weighing scales. The TI datasheet confirms 16 bits no-missing-codes at 40 kSPS, ensuring monotonic settling for calibration stability. Connect the bridge-excited load cell to the ADC's +/-10V range through a low-offset front-end instrumentation amp; with a 10Hz mechanical filter the ADS7807UBE4 produces stable, repeatable weight readings to <0.01 lb on commercial scales. Operating from +5V, the part draws only 35 mW and can drop to 50 uW between conversions for battery-powered portable scales.
Được đề xuất
Medical Instrumentation Front End
The ADS7807UBE4 serves medical instrumentation front ends (patient monitors, ECG/BP modules, handheld diagnostics) well thanks to its 86 dB SINAD, low power dissipation (35 mW active / 50 uW shutdown), and +/-10V bipolar-input flexibility. According to the TI ADS7807 datasheet, the part's deterministic SAR latency simplifies pacemaker-style closed-loop control loops. Routinely used in legacy diagnostic ultrasound, infusion-pump, and blood-gas analyzer boards. Designers should pair it with a low-leakage input MUX and an op-amp front end such as TI's OPA1611 to maintain the 16-bit noise floor in the 0.1 Hz - 100 Hz biosignal band.
Được đề xuất
Pen-Trace Digitizer / Chart-Recorder Replacement
The ADS7807UBE4's 86 dB SINAD and 16-bit resolution make it a natural fit for digitizing legacy chart-recorder analog channels in pen-trace digitizers and strip-chart replacement modules. The TI datasheet specifies +/-1.5 LSB INL max and 16-bit no-missing-codes which preserves the visual fidelity of slow-moving analog traces digitized for archival. Use the parallel interface for fastest sample transfer to a microcontroller or DSP, with the +5V single-supply operation simplifying legacy +5V analog-board retrofits. The wide +/-10V input range accommodates existing +/-10V transducer outputs from strain-gauge or thermocouple conditioning front ends.
Được đề xuất
Seismic / Vibration Monitoring
The ADS7807UBE4's 86 dB SINAD and anti-alias-friendly SAR architecture enable it to digitize seismic and vibration sensor outputs in structural-health monitoring nodes. With its deterministic 25 us conversion and 40 kSPS ceiling, the device can capture vibration harmonics well above typical seismic-sensor bandwidths. The TI datasheet confirms 16-bit no-missing-codes performance, ensuring the spectral analysis does not lose energy to integral non-linearity errors. Pair it with a 4-pole Butterworth anti-alias filter at 10 kHz and a low-noise MEMS accelerometer to build IP67-rated vibration nodes that run on solar or battery power for years.
Được đề xuất
Process-Control Loop Input Module
The ADS7807UBE4's 86 dB SINAD, +/-10V input range, and single +5V supply operation suit it to industrial process-control analog-input modules (4-20 mA loop receivers, +/-10V PLC analog cards, RTD front ends). According to the TI datasheet, the part's 86 dB SINAD at 1 kHz input ensures the digitization loop retains enough dynamic range to encode process variables spanning 3-4 decades. Routinely integrated into 8-channel and 16-channel analog-input cards alongside low-leakage CMOS multiplexers; the parallel data bus simplifies hookup to common 16-MCUs and DSPs. Active power of 35 mW and a 50 uW shutdown mode also support distributed I/O nodes where cabinet thermal budget is constrained.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS7807UBE4 — 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 | ADS7807PBG4 | ADS8507IBDW | ADS8507IDW | ADS7825U/1K | AD976ANZ |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | 28-SOIC (DW, 7.50mm) | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC (DW) - same | 28-SOIC - same | 28-SOIC - same |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits |
| Sampling Rate | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | ~25 kSPS (slower, ~38% delta) | 100 kSPS (faster, +150%) |
| Architecture | SAR | SAR | SAR | SAR | SAR | SAR |
| Input Ranges | +/-10V, 0-5V, 0-4V | +/-10V, 0-5V, 0-4V (identical) | +/-10V, 0-5V (subset) | +/-10V, 0-5V (subset) | 0-5V, 0-10V (unipolar only) | +/-10V |
| Supply Voltage | +5V single | +5V single | +5V single | +5V single | +5V single | +5V single |
| Data Interface | Serial + Parallel | Serial + Parallel | Parallel | Parallel | Serial | Parallel |
Bảo phân biệt quan trọng
- Tape-and-Reel factory packaging vs tray (vsADS7807U / ADS7807PBG4)
- Newer-generation design with similar parametric envelope (vsADS8507IBDW)
- Pin-compatible cross-brand alternative for non-TI supply chains (vsAD976ANZ)
Ghi chú thiết kế
Estimated: At active conversion the ADS7807UBE4 draws ~7 mA from +5V (VANA and VAND combined). TI recommends a 10 uF tantalum (or low-ESR ceramic) plus a 0.1 uF ceramic placed within 5 mm of the VANA and VAND pins to keep reference regulator noise off the conversion floor. Sharing the analog and digital +5V at the IC pin without this decoupling can show up as ~2 LSB of periodic noise on the digitized output at low input levels.
Keep the AGND and DGND nets joined at exactly one point - directly under the chip at the exposed paddle / AGND pin (pin 4 of the 28-SOIC), per the TI datasheet layout recommendation. Do not run digital data-bus traces (DB0-DB15) under or near the analog input or VREF traces; a guard trace tied to AGND between AIN and the data bus typically improves SFDR by 4-6 dB.
Driving CS low before R/C falls, or holding R/C low longer than 25 us, causes an extra conversion to be triggered after BUSY falls. The TI datasheet timing diagram shows R/C must transition high before BUSY goes low, or alternatively the part re-enters conversion mode and produces a stale result. Also, when using the BYS pin to bypass the internal 2.5V reference with an external reference, ensure the reference is stable to within 100 us of power-up or the first 1-2 conversions will be erroneous.
Thông tin tuân thủ
RoHS and REACH compliance declared by Texas Instruments on the product page. The ADS7807UBE4 is not AEC-Q100 qualified - it is rated for industrial -40C to +85C, not automotive grade. Halogen-free status not explicitly stated in the sourced data.
