ADS7805PG4 - 16-Bit 100kSPS SAR ADC | Texas Instruments
MPN： ADS7805PG4 ✗ 停產ADS7805PG4 概覽
An SAR ADC is a type of analog-to-digital converter that uses a binary-search successive-approximation algorithm against an internal precision DAC. SAR ADCs sit in the converter hierarchy between flash converters (fastest, lowest resolution) and sigma-delta converters (slowest, highest resolution), making them ideal for medium-speed, medium-resolution precision measurement. The ADS7805PG4 is widely used in industrial process control, data acquisition systems, and instrumentation where true 16-bit performance at 100 kSPS is required.
Key features include 86 dB minimum SINAD at 20 kHz input, ±10 V or 0-4 V / 0-5 V input ranges, an internal 2.5 V reference (externally overridable), single +5 V analog supply operation, and a low-power CMOS design. The parallel output interface provides direct connection to 8-bit, 12-bit, or 16-bit microprocessors with read-only access, simplifying system integration.
Architecturally, the device uses a charge-redistribution SAR core with laser-trimmed calibration DACs to achieve ±0.5 LSB linearity after internal self-calibration at power-up. The internal reference and input scaling resistors form a complete signal-conditioning front end, eliminating the need for external precision op-amps in most applications.
Typical applications include industrial process control loops, multichannel data acquisition boards, medical instrumentation front ends, and bench-top test equipment. The wide ±10 V input range makes the ADS7805PG4 directly compatible with industrial sensor outputs without additional signal conditioning.
When designing with this part, observe the input RC network requirements and the capacitor selection guidance on pins 3 and 4 (REF and CAP) - a 2.2 µF capacitor on each pin is required for noise filtering. For new designs, the datasheet recommends considering the ADS8505 as the active replacement.
This page synthesizes distributor pricing, pin-compatible drop-in alternatives, and practical PCB design notes not collected in a single place in the TI datasheet.
直接替換替代品，適用於 ADS7805PG4 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADS7805PG4 （相同外形與佔位） — 差異在於 Package, RoHS Status, Data Interface, Operating Temperature, Input Voltage Range.
ADS7805PB
✅ 直接替換聯絡詢價
查看資料表 →ADS8505IPW
✅ 直接替換📋 參考替代品（不在目錄中）
ADS7805PB
✅ 直接替換聯絡詢價
查看資料表 →ADS8505IDW
✅ 直接替換📋 參考替代品（不在目錄中）
ADS7805PG4 最大額定值與電氣特性
| Number of Bits | 16 |
| 取樣率 | 100 kSPS |
| Conversion Time | 10 µs |
| Number of Inputs | 1 |
| Input Type | Single-Ended |
| 輸入電壓範圍 | ±10 V (or 0-4 V, 0-5 V) |
| Data Interface | Parallel |
| Architecture | SAR (Successive Approximation) |
| SINAD | 86 dB minimum at 20 kHz input |
| Analog Supply Voltage | 5 V nominal |
| Internal Reference | 2.5 V (external override supported) |
| 工作溫度 | -25 °C to +85 °C |
| 封裝 / 外殼 | 28-DIP (0.300 inch, 7.62 mm) |
| 腳位數 | 28 |
| 安裝類型 | Through-Hole |
| Packaging | Tube |
| RoHS 狀態 | Compliant |
ADS7805PG4 腳位配置
| 腳位 1 | VANA — +5 V analog supply |
| 腳位 2 | AGND — Analog ground |
| 腳位 3 | REF — Reference output / external reference input (decouple with 2.2 µF) |
| 腳位 4 | CAP — Reference noise filter capacitor (2.2 µF to AGND) |
| 腳位 5 | AGND — Analog ground |
| 腳位 6 | DB15/MSB — Parallel data bit 15 (MSB) when HBEN=0 |
| 腳位 7 | R1K — Input range resistor (tie to AGND for ±10 V) |
| 腳位 8 | DB14 — Parallel data bit 14 |
| 腳位 9 | R1IN — Input range resistor (tie to VANA for ±10 V) |
| 腳位 10 | DB13 — Parallel data bit 13 |
| 腳位 11 | AIN — Analog input |
| 腳位 12 | DB12 — Parallel data bit 12 |
| 腳位 13 | AGND — Analog ground |
| 腳位 14 | DB11 — Parallel data bit 11 |
| 腳位 15 | AGND — Analog ground |
| 腳位 16 | DB10 — Parallel data bit 10 |
| 腳位 17 | CLK — External clock input (or internal oscillator) |
| 腳位 18 | DB9 — Parallel data bit 9 |
| 腳位 19 | R/C — Read / Convert control input |
| 腳位 20 | DB8 — Parallel data bit 8 |
| 腳位 21 | /CS — Chip select (active low) |
| 腳位 22 | DB7/LSB — Parallel data bit 7 (LSB when HBEN=1) |
| 腳位 23 | DGND — Digital ground |
| 腳位 24 | DB6 — Parallel data bit 6 |
| 腳位 25 | /RD — Read strobe (active low) |
| 腳位 26 | DB5 — Parallel data bit 5 |
| 腳位 27 | BUSY — Conversion in progress output (active high) |
| 腳位 28 | DB4/HBEN — Parallel data bit 4 / High-byte enable input |
典型應用
ADS7805PG4 適用於 6 應用s: Industrial Process Control / PLC Analog Input, Data Acquisition Systems, Medical Instrumentation Front Ends, Test & Measurement Equipment, Automotive Sensor Signal Digitization (Legacy), Audio Analyzer and Precision Measurement.
Industrial Process Control / PLC Analog Input
The ADS7805PG4's ±10 V input range, 86 dB SINAD at 20 kHz, and ±0.5 LSB linearity make it ideal for industrial process control analog input modules that digitize ±10 V transducer outputs from pressure, flow, and temperature transmitters in PLCs and DCS systems. The 28-pin PDIP package is well-suited to legacy through-hole industrial control boards, and the parallel interface connects directly to 8051-family microcontrollers without an external address latch. Designers benefit from integrated sample-and-hold, on-chip reference, and self-calibration at power-up, eliminating precision op-amps in front of the converter and reducing BOM cost in multi-channel PLC modules.
推薦
Data Acquisition Systems
For 16-bit data acquisition boards, the ADS7805PG4 delivers 100 kSPS throughput that allows multi-channel multiplexing to achieve aggregate sample rates suitable for vibration, strain-gauge, and laboratory bench-top data loggers. The wide ±10 V input range and on-chip reference simplify frontend design, and the parallel byte/word output reduces firmware complexity versus serial-interface ADCs. Placed downstream of an analog multiplexer (e.g., MUX508) and an instrumentation amp, the converter provides true 16-bit performance with no missing codes over the industrial -25 °C to +85 °C range.
推薦
Medical Instrumentation Front Ends
Medical instrumentation such as patient monitors, infusion pumps, and bench-top analyzers require 16-bit resolution at low sampling rates to digitize sensor-derived analog signals. The ADS7805PG4's 86 dB SINAD preserves the dynamic range needed for ECG, SpO2, and biochemical analyzer signal chains, while its single +5 V supply simplifies the medical-grade isolated power architecture. The 28-DIP through-hole package also suits medical equipment with hand-repairable boards and reduces thermal stress during soldering.
推薦
Test & Measurement Equipment
Bench-top multimeters, oscilloscope front ends, and power analyzer signal chains use the ADS7805PG4 to digitize ±10 V analog signals with 16-bit resolution at 100 kSPS. The high SINAD and low integral nonlinearity translate directly to improved measurement accuracy for voltage, current, and power probes. The parallel output bus enables real-time waveform capture in digital phosphor oscilloscopes, while the through-hole 28-DIP package supports the larger board geometries common in laboratory instruments.
推薦
Automotive Sensor Signal Digitization (Legacy)
Although ADS7805PG4 is NRND and not AEC-Q100 qualified, it has historically been used in non-safety automotive subsystems such as engine-control sensor digitizers and dashboard instrumentation. Its ±10 V input range accepts the output of conditioned automotive sensors (MAP, MAF, throttle position), and the 16-bit resolution supports precise actuator control loops. For new automotive designs, however, AEC-Q100-qualified TI ADS8505 family variants should be specified.
推薦
Audio Analyzer and Precision Measurement
Audio test equipment, distortion analyzers, and AC measurement instruments rely on the ADS7805PG4's 86 dB SINAD to maintain the high signal-to-noise ratio required for THD+N measurements down to 0.01 %. With 100 kSPS throughput, the converter comfortably digitizes full-bandwidth audio at 44.1 kSPS or higher while preserving 16-bit resolution. The ±10 V input range also lets the converter interface directly with pro-audio +4 dBu line-level signals after attenuation.
推薦
推薦產品摘要
工程參考資料，適用於 ADS7805PG4 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADS7805P | ADS8505IPW | ADS7805PB | AD976ANZ |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | 28-PDIP | 28-PDIP | 28-SOIC (PW) | 28-PDIP | 28-PDIP |
| Resolution | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit |
| Sample Rate | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS | 100 kSPS |
| Input Voltage Range | ±10 V / 0-4 V / 0-5 V | ±10 V / 0-4 V / 0-5 V | ±10 V / 0-5 V | ±10 V / 0-4 V / 0-5 V | ±10 V / 0-4 V / 0-5 V |
| SINAD | 86 dB min | 86 dB min | 84 dB min | 86 dB min | 85 dB min |
| Data Interface | Parallel | Parallel | Parallel | Parallel | Parallel |
| Lifecycle | NRND | NRND | Active | NRND | Active |
主要差異化特點
- True 16-bit no-missing-codes performance with integrated ±10 V input scaling (對比AD976ANZ (Analog Devices))
- Through-hole 28-DIP package available for legacy industrial boards (對比ADS8505IPW (TI SOIC-28))
- On-chip self-calibration at every power-up (對比AD976ANZ (Analog Devices))
設計說明
The ADS7805PG4 requires a clean +5 V analog supply on pin 1 (VANA) and a separate digital +5 V on the digital supply pin if used; share analog and digital ground at a single point beneath the chip. Decouple VANA with a 10 µF tantalum + 0.1 µF ceramic pair placed within 5 mm of the pin to suppress switching noise from the internal charge-redistribution DAC during conversions.
Pin 3 (REF) and pin 4 (CAP) each require a 2.2 µF capacitor to analog ground for proper reference filtering - omit them and reference noise will degrade SINAD by 6-10 dB. Per TI E2E guidance, X7R 2.2 µF/25 V ceramic capacitors are a valid modern replacement for the originally specified tantalum units and are recommended for new designs.
Keep the analog input traces (pin 11 AIN) and the input range resistor network (pins 7/9) physically short and away from the parallel data bus (pins 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28). Use a ground plane on the analog side and route digital lines on the opposite PCB layer to minimize digital-to-analog crosstalk that could degrade the 86 dB SINAD specification.
合規資訊
G4 suffix designates Pb-free RoHS-compliant finish per TI product page. Not AEC-Q100 qualified - choose AEC-Q100-qualified ADS8505 automotive variants for new automotive designs. NRND status as of 2026-10-12.
