ADS7805PG4 - 16-Bit 100kSPS SAR ADC | Texas Instruments
MPN: ADS7805PG4 ✗ Cuối đờiADS7805PG4 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ADS7805PG4 — 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 ADS7805PG4 (cùng hình factor và footprint) — khác nhau ở Package, RoHS Status, Data Interface, Operating Temperature, Input Voltage Range.
ADS7805PB
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8505IPW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS7805PB
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS8505IDW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD976ANZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD976CNZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7805PG4 Tỷ lệ tối đa & tính chất điện
| Number of Bits | 16 |
| Tỷ lệ lấy mẫu | 100 kSPS |
| Conversion Time | 10 µs |
| Number of Inputs | 1 |
| Input Type | Single-Ended |
| Phạm vi điện áp đầu vào | ±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) |
| Nhiệt độ hoạt động | -25 °C to +85 °C |
| Hộp / Vỏ | 28-DIP (0.300 inch, 7.62 mm) |
| Số chân | 28 |
| Kiểu lắp đặt | Through-Hole |
| Packaging | Tube |
| Trạng thái RoHS | Compliant |
Cấu hình chân ADS7805PG4
| Chân 1 | VANA — +5 V analog supply |
| Chân 2 | AGND — Analog ground |
| Chân 3 | REF — Reference output / external reference input (decouple with 2.2 µF) |
| Chân 4 | CAP — Reference noise filter capacitor (2.2 µF to AGND) |
| Chân 5 | AGND — Analog ground |
| Chân 6 | DB15/MSB — Parallel data bit 15 (MSB) when HBEN=0 |
| Chân 7 | R1K — Input range resistor (tie to AGND for ±10 V) |
| Chân 8 | DB14 — Parallel data bit 14 |
| Chân 9 | R1IN — Input range resistor (tie to VANA for ±10 V) |
| Chân 10 | DB13 — Parallel data bit 13 |
| Chân 11 | AIN — Analog input |
| Chân 12 | DB12 — Parallel data bit 12 |
| Chân 13 | AGND — Analog ground |
| Chân 14 | DB11 — Parallel data bit 11 |
| Chân 15 | AGND — Analog ground |
| Chân 16 | DB10 — Parallel data bit 10 |
| Chân 17 | CLK — External clock input (or internal oscillator) |
| Chân 18 | DB9 — Parallel data bit 9 |
| Chân 19 | R/C — Read / Convert control input |
| Chân 20 | DB8 — Parallel data bit 8 |
| Chân 21 | /CS — Chip select (active low) |
| Chân 22 | DB7/LSB — Parallel data bit 7 (LSB when HBEN=1) |
| Chân 23 | DGND — Digital ground |
| Chân 24 | DB6 — Parallel data bit 6 |
| Chân 25 | /RD — Read strobe (active low) |
| Chân 26 | DB5 — Parallel data bit 5 |
| Chân 27 | BUSY — Conversion in progress output (active high) |
| Chân 28 | DB4/HBEN — Parallel data bit 4 / High-byte enable input |
Ứng dụng tiêu biểu
ADS7805PG4 phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS7805PG4 — 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 | 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 |
Bảo phân biệt quan trọng
- True 16-bit no-missing-codes performance with integrated ±10 V input scaling (vsAD976ANZ (Analog Devices))
- Through-hole 28-DIP package available for legacy industrial boards (vsADS8505IPW (TI SOIC-28))
- On-chip self-calibration at every power-up (vsAD976ANZ (Analog Devices))
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
