ADS7805UE4 - 16-Bit 100kHz SAR ADC, ±10V Input | Texas Instruments
MPN: ADS7805UE4 ✓ Hoạt độngADS7805UE4 Tóm tắt
A SAR ADC is a type of data converter that performs a binary search through an internal capacitive digital-to-analog converter (CDAC) to resolve each conversion in N steps for an N-bit result. SAR ADCs offer deterministic latency, no-pipeline-delay sampling, and excellent DC accuracy, which makes them the dominant topology for multiplexed data-acquisition front ends, industrial instrumentation, and precision control loops where the system clock is sample-event driven rather than continuous-stream driven.
Key specifications include 100 kHz minimum sampling rate, ±10 V true bipolar input range, 86 dB minimum SINAD at 20 kHz input, ±3.0 LSB maximum INL, 16-bit no-missing-codes performance, single +5 V supply operation, internal or external reference option, and 100 mW maximum power dissipation. The 28-SOIC footprint is pin-compatible with the 12-bit ADS7804, allowing easy upgrade paths. Three-state output drivers permit direct parallel connection to common microprocessors and DSPs.
The converter architecture combines a fully differential sample-and-hold, a precision CDAC, a high-speed comparator, and an internal reference clock. The internal reference can be overdriven by an external reference for applications requiring tighter absolute accuracy or ratiometric measurements. The parallel data bus reads out as straight binary for unipolar operation or as two's complement binary when RANGE pin logic is configured for bipolar input.
Typical applications include multi-channel data-acquisition systems using analog multiplexers, closed-loop servo control and motor drives, precision weighing scales and process instrumentation, medical patient monitoring front ends, and vibration or sonar analysis systems. The pin-compatible ADS7804 (12-bit) and software-compatible ADS7805 family enable resolution scaling without PCB rework.
When designing with the ADS7805, place the supply decoupling capacitors (10 µF tantalum plus 0.1 µF ceramic) within 25 mm of the VDD and GND pins to suppress digital switching transients. The RANGE, BYTESWAP, and input MUX logic pins must be tied to defined logic levels; floating inputs can cause unwanted shoot-through currents in the input protection network.
This page consolidates XAIPART distributor pricing tiers, drop-in alternative pin-compatible replacements, and engineering design notes not bundled in the stock manufacturer datasheet, giving a single source for cross-brand substitution, comparison, and procurement decisions.
Bộ thay thế dễ dàng lắp đặt cho ADS7805UE4 — 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 ADS7805UE4 (cùng hình factor và footprint) — khác nhau ở Package, Reference, Resolution, Architecture, Mounting Type.
ADS7805U
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7805UB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS7805PB
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7805PG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7804U
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7805UE4 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bits |
| Sampling Rate (min) | 100 kHz |
| Number of Input Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Input Range | ±10 V (true bipolar) |
| SINAD (min, fIN=20 kHz) | 86 dB |
| INL (max) | ±3.0 LSB |
| DNL | No missing codes (16-bit) |
| Data Interface | Parallel (3-state outputs) |
| Điện áp cung cấp | +5 V single |
| Power Dissipation (max) | 100 mW |
| Reference | Internal or external |
| Input Configuration | Single-ended / pseudo-differential |
| Hộp | 28-SOIC (DW) 0.295 inch, 7.50 mm width |
| Nhiệt độ hoạt động | -25 °C to +85 °C |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân ADS7805UE4
| Chân 1 | VIN+ — Analog input positive (true bipolar ±10 V) |
| Chân 2 | AGND — Analog ground |
| Chân 3 | REF — Reference input/output (internal +2.5 V or external overdrive) |
| Chân 4 | CAP — Reference bypass capacitor pin |
| Chân 5 | AGND — Analog ground |
| Chân 6 | RANGE — Input range select (unipolar/bipolar) |
| Chân 7 | D15 (MSB) — Parallel data bit 15 (MSB) |
| Chân 8 | D14 — Parallel data bit 14 |
| Chân 9 | D13 — Parallel data bit 13 |
| Chân 10 | D12 — Parallel data bit 12 |
| Chân 11 | D11 — Parallel data bit 11 |
| Chân 12 | D10 — Parallel data bit 10 |
| Chân 13 | D9 — Parallel data bit 9 |
| Chân 14 | D8 — Parallel data bit 8 |
| Chân 15 | DGND — Digital ground |
| Chân 16 | D7 — Parallel data bit 7 |
| Chân 17 | D6 — Parallel data bit 6 |
| Chân 18 | D5 — Parallel data bit 5 |
| Chân 19 | D4 — Parallel data bit 4 |
| Chân 20 | D3 — Parallel data bit 3 |
| Chân 21 | D2 — Parallel data bit 2 |
| Chân 22 | D1 — Parallel data bit 1 |
| Chân 23 | D0 (LSB) — Parallel data bit 0 (LSB) |
| Chân 24 | BYTE — Byte swap / data format select |
| Chân 25 | R/C — Read/convert control input |
| Chân 26 | CS — Chip select (active low) |
| Chân 27 | BUSY — Conversion in progress (active high) |
| Chân 28 | VDD — +5 V analog/digital supply |
Ứng dụng tiêu biểu
ADS7805UE4 phù hợp cho 6 Áp dụngs: Multi-Channel Data Acquisition Systems, Precision Industrial Weighing Scales, Closed-Loop Servo and Motor Control, Medical Patient Monitoring Front Ends, Vibration and Sonar Signal Analysis, Industrial Process Control Instrumentation.
Multi-Channel Data Acquisition Systems
The ADS7805UE4's 100 kHz sampling rate and ±10 V true bipolar input pair naturally with 8/16-channel analog multiplexers for industrial data acquisition front ends. Its 16-bit no-missing-codes performance and 86 dB SINAD at 20 kHz preserve dynamic range across multiplexed inputs without requiring per-channel signal conditioning. The single-cycle SAR conversion latency keeps timing deterministic for sample-sequenced control loops. Designers typically place a low-leakage MUX such as the MUX36S08 ahead of the ADS7805UE4 and use its RANGE pin to switch between unipolar 0-10 V and bipolar ±10 V measurement ranges without firmware reconfiguration.
Được đề xuất
Precision Industrial Weighing Scales
Load-cell weighing platforms require 16-bit resolution and very low INL to resolve gram-level weights across a 100 kg scale. The ADS7805UE4's ±3.0 LSB max INL and 100 kHz throughput enable software-filtered settling times under 100 ms for stable weight readings. The true bipolar ±10 V input accepts the differential output of bridge amplifiers such as the INA128 directly. For ratiometric measurement, designers overdrive the internal reference with the bridge excitation voltage to cancel excitation drift; the ADS7805UE4 supports this through its REF pin external-reference mode without firmware changes.
Được đề xuất
Closed-Loop Servo and Motor Control
Servo and motion-control systems demand deterministic sample-to-output latency that SAR ADCs deliver without the pipeline delay of pipelined converters. The ADS7805UE4's single-cycle conversion, BUSY flag, and parallel data bus let a DSP or FPGA read conversion results with the same cycle they are produced. Its 100 kHz sampling supports current-loop update rates up to 100 kHz for high-bandwidth motor drives; 86 dB SINAD provides the dynamic range for high-resolution torque sensing. Place a current-sense amplifier such as the INA240 at the motor phase, then route its filtered output directly into the ADS7805UE4's ±10 V input for per-cycle current feedback.
Được đề xuất
Medical Patient Monitoring Front Ends
ECG, EEG, and pulse-oximetry front ends digitize low-amplitude biopotential signals after analog amplification, demanding 16-bit resolution to capture µV-level detail without quantization artifacts. The ADS7805UE4's 100 kHz sampling easily covers 500 Hz biomedical signal bandwidth with 100x oversampling margin, while the parallel interface simplifies DSP-side sample alignment. The ±10 V bipolar input accommodates the post-amplifier signal swing of instrumentation amplifiers like the INA333 without further gain stages. System designers should add IEC 60601-1 patient isolation and EMI filtering at the PCB level; the ADS7805UE4 is itself a non-medical-grade component used inside medical devices.
Được đề xuất
Vibration and Sonar Signal Analysis
Acoustic and vibration analysis systems digitize transducer signals at audio-to-ultrasonic frequencies with high dynamic range. The ADS7805UE4's 100 kHz sampling rate covers vibration analysis up to 40 kHz (per Nyquist), while its 86 dB SINAD and low total-harmonic-distortion capture spectral content with high fidelity. Conditioning stages using AC-coupled instrumentation amplifiers feed the ADS7805UE4's ±10 V input directly, eliminating the need for additional gain stages. Designers performing FFT or PSD analysis on the digital output stream benefit from the SAR topology's lack of pipeline delay, which simplifies windowing and spectral leakage calculations.
Được đề xuất
Industrial Process Control Instrumentation
Process instrumentation - including pressure transmitters, flow meters, and temperature controllers - require reliable 16-bit digitisation with bipolar input ranges and industrial temperature tolerance. The ADS7805UE4's -25 °C to +85 °C industrial temperature grade and ±10 V bipolar input match 4-20 mA loop-powered transmitters and direct thermocouple-amplified outputs. Its 86 dB SINAD supports tight control-loop resolution; combined with 100 kHz sampling, the part enables high-speed valve-position feedback and process variable monitoring. The 28-SOIC footprint simplifies placement in DIN-rail or field-mount enclosures where through-hole DIP variants like the ADS7805UB are also acceptable.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS7805UE4 — 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 | ADS7805U | ADS7805UB | ADS7805PB | ADS7805PG4 | ADS7804U |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-SOIC (DW) | 28-SOIC (DW) - same | 28-PDIP (NT) - DIP through-hole | 28-PDIP (NT) - DIP through-hole | 28-PDIP (NT) - DIP through-hole | 28-SOIC (DW) - same |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 12 bits (-25%) |
| Sampling Rate | 100 kHz min | 100 kHz | 100 kHz | 100 kHz | 100 kHz | 100 kHz |
| Input Range | ±10 V | ±10 V | ±10 V | ±10 V | ±10 V | ±10 V |
| SINAD (min, 20 kHz) | 86 dB | 86 dB | 86 dB | 86 dB | 86 dB | 72 dB (-14 dB) |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| Data Interface | Parallel (3-state) | Parallel (3-state) | Parallel (3-state) | Parallel (3-state) | Parallel (3-state) | Parallel (3-state) |
| Operating Temperature | -25 °C to +85 °C | -25 °C to +85 °C | -25 °C to +85 °C | -25 °C to +85 °C | -25 °C to +85 °C | -25 °C to +85 °C |
| Pin-to-Pin Compatible | Yes (ADS7804 upgrade path) | Yes (same SOIC footprint) | Same die, different footprint (PDIP) | Same die, different footprint (PDIP) | Same die, different footprint (PDIP) | Yes (downgrade resolution, same SOIC footprint) |
Bảo phân biệt quan trọng
- Pin-compatible 16-bit upgrade path from 12-bit ADS7804 (vsADS7804U)
- Single +5 V supply with 100 mW dissipation (vsADS7805U)
- True bipolar ±10 V input range built-in (vsADS7805U)
Ghi chú thiết kế
Place a 10 µF tantalum (or low-ESR ceramic) decoupling capacitor and a 0.1 µF ceramic capacitor in parallel within 25 mm of the VDD pin (pin 28). The ADS7805UE4's 100 mW max dissipation produces step transients on the +5 V rail during BUSY transitions; poor decoupling couples these transients into the reference and degrades SINAD by 3-6 dB. Per the TI datasheet application circuit, separate analog and digital ground planes tied only at the AGND/DGND pins prevent digital switching noise from corrupting the analog input stage.
Route the analog input (VIN+, AGND) as a tightly-coupled differential pair on the top layer with a continuous ground pour underneath; avoid routing digital bus lines (D0-D15, BUSY, R/C, CS) parallel to or crossing the analog input traces. Place a guard ring around the input pins driven by AGND to absorb leakage from the PCB substrate. The high-impedance input stage is sensitive to leakage currents as low as 1 nA - clean PCB assembly with no-clean flux and thorough cleaning is recommended for high-impedance analog designs using the ADS7805UE4.
Tie the RANGE pin to either DGND (unipolar) or VDD (bipolar ±10 V) through a 1 kΩ resistor close to the IC; never leave this pin floating as the internal CMOS gate can drift into a linear region drawing excessive quiescent current. Similarly, tie BYTESWAP and CS to defined logic levels. Per the TI datasheet, the BUSY output pin should be pulled high through a 10 kΩ resistor if unused; if left floating it can oscillate and inject noise into adjacent analog traces.
Estimated: input-referred noise for the ADS7805UE4 is approximately 3 µVrms in 100 kHz bandwidth assuming a +2.5 V internal reference; this corresponds to ~2 LSB p-p at 16-bit resolution. Do NOT place the part adjacent to switching DC-DC converters or digital FPGAs with edge rates faster than 5 ns - radiated EMI can couple into the 100 kHz sample window. When using the internal reference, the CAP pin (pin 4) MUST have a 10 µF X7R bypass capacitor to AGND; omitting this capacitor increases output noise by 5-10 dB per TI application note.
Thông tin tuân thủ
RoHS-compliant per TI product page. Lead-free finish indicated by 'E4' suffix. Not AEC-Q100 qualified (industrial/commercial grade only); not a medical or automotive qualified component.
