ADS7807PG4 - 16-Bit 40kSPS Low-Power SAR ADC | Texas Instruments
MPN: ADS7807PG4 ✓ Hoạt độngADS7807PG4 Tóm tắt
A Successive Approximation Register (SAR) ADC is a type of data converter that resolves one bit per clock cycle by comparing the sampled input against a binary-weighted capacitor network driven by an internal reference. SAR ADCs sit between flash converters (very fast, low resolution) and sigma-delta ADCs (high resolution, slower) in the data-converter hierarchy, offering a balance of speed, accuracy, and deterministic latency that is well suited to multiplexed multi-channel measurement systems.
Key specifications of the ADS7807PG4 include a maximum sampling rate of 40 kSPS, maximum acquisition-plus-conversion time of 25 us, +/-1.5 LSB maximum INL, 16-bit no-missing-codes DNL, and 86 dB minimum SINAD with a 1 kHz input. The part draws only 35 mW during conversion and falls to 50 uW in power-down mode, which makes it well matched to battery-instrumented or thermally-constrained designs. Operating temperature range is -40 C to +85 C (industrial grade).
Architecture-wise, the ADS7807PG4 uses an inherent sample-and-hold front-end that allows the input stage to settle before conversion, removing the need for an external buffer in most applications. The internal 2.5 V reference is laser-trimmed and can be overdriven externally if system calibration is required. The output data bus can be configured for 8-bit or 16-bit parallel mode, plus a synchronous serial mode for low-pin-count designs.
Typical applications include industrial process-control data-acquisition front ends, multi-channel instrumentation digitizers, weigh-scale and strain-gauge signal chains, panel meters, battery-powered portable test equipment, and medical instrumentation front ends. The wide +/-10 V true-bipolar input range removes external signal-conditioning in many PLC and SCADA designs.
When designing with this part, place a 10 uF tantalum in parallel with a 0.1 uF ceramic bypass capacitor as close as possible to the +5 V supply pin, and ensure the analog input source impedance stays below the manufacturer's recommended maximum to keep INL within data-sheet limits. Use the BYTE and R/C pins to configure interface mode and initiate conversions.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer datasheet alone, giving engineers a single reference for the ADS7807PG4.
Bộ thay thế dễ dàng lắp đặt cho ADS7807PG4 — 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 ADS7807PG4 (cùng hình factor và footprint) — khác nhau ở Architecture, Package, Data Interface, Mounting Type, Operating Temperature Range.
ADS7807PBG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7807PBG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7807U
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7807UB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8507IDW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8506IDW
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS7807PG4 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bits |
| Architecture | SAR (Successive Approximation Register) |
| Number of Input Channels | 1 |
| Tỷ lệ lấy mẫu | 40 kSPS max |
| Acquisition + Conversion Time | 25 us max |
| Điện áp cung cấp | +5 V single supply |
| Analog Input Ranges | +/-10 V, +/-5 V, 0 V to 10 V, 0 V to 4 V |
| Integral Nonlinearity (INL) | +/-1.5 LSB max |
| Differential Nonlinearity (DNL) | 16 bits, no missing codes |
| SINAD | 86 dB min (with 1 kHz input) |
| Power Dissipation (Active) | 35 mW max |
| Power Dissipation (Power-Down) | 50 uW max |
| Data Interface | Parallel (8/16-bit) and Serial |
| Khoảng nhiệt độ hoạt động | -40 C to +85 C |
| Hộp | 28-PDIP (0.300 inch, 7.62 mm) |
| Kiểu lắp đặt | Through-Hole |
| Packaging | Tube |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân ADS7807PG4
| Chân 1 | R1 — Analog input range select bit 1 |
| Chân 2 | R2 — Analog input range select bit 2 |
| Chân 3 | AGND1 — Analog ground (input section) |
| Chân 4 | REF — Reference voltage input/output (internal 2.5 V) |
| Chân 5 | AIN+ — Non-inverting analog input |
| Chân 6 | AIN- — Inverting analog input |
| Chân 7 | CAP — Reference bypass capacitor |
| Chân 8 | DGND — Digital ground |
| Chân 9 | VANA — +5 V analog supply |
| Chân 10 | VDIG — +5 V digital supply |
| Chân 11 | PWDN — Power-down input (active high) |
| Chân 12 | TAG — Tag input for channel identification |
| Chân 13 | CS — Chip select input (active low) |
| Chân 14 | R/C — Read/Convert input |
| Chân 15 | BUSY — BUSY output (low during conversion) |
| Chân 16 | BYTE — Byte mode select (parallel interface) |
| Chân 17 | HBEN — High byte enable |
| Chân 18 | DATA — Serial data output |
| Chân 19 | SCLK — Serial clock output |
| Chân 20 | EXT/INT — External/internal clock select |
| Chân 21 | D15 — Parallel data bit 15 (MSB) |
| Chân 22 | D14 — Parallel data bit 14 |
| Chân 23 | D13 — Parallel data bit 13 |
| Chân 24 | D12 — Parallel data bit 12 |
| Chân 25 | D11 — Parallel data bit 11 |
| Chân 26 | D10 — Parallel data bit 10 |
| Chân 27 | D9 — Parallel data bit 9 |
| Chân 28 | D8 — Parallel data bit 8 |
Ứng dụng tiêu biểu
ADS7807PG4 phù hợp cho 6 Áp dụngs: Industrial Process Control Data Acquisition, Weigh Scale and Strain-Gauge Digitizer, Panel Meter and Digital Instrumentation, Medical Patient Monitoring Front End, Battery-Powered Portable Test Equipment, Audio Bandwidth Signal Analyzer.
Industrial Process Control Data Acquisition
The ADS7807PG4 is well matched to industrial process-control analog input modules because its true-bipolar +/-10 V input range accepts +/-10 V transducer signals directly without external signal conditioning. At 16-bit resolution and 86 dB SINAD, it provides enough dynamic range to resolve 4-20 mA loop-referenced sensor signals after shunt conversion. The 40 kSPS throughput supports multiplexed multi-channel scanning for PLC backplanes, and the through-hole 28-PDIP package matches legacy form factors still common in factory-floor control cabinets.
Được đề xuất
Weigh Scale and Strain-Gauge Digitizer
Weigh-scale front ends using load cells in a Wheatstone bridge benefit from the ADS7807PG4's 16-bit no-missing-codes performance and very low integral nonlinearity of +/-1.5 LSB max. The internal 2.5 V reference provides a stable excitation ratiometric reference for the bridge, while the +/-5 V or +/-10 V input range can be configured to capture the millivolt-level bridge output after instrumentation-amp gain. The 35 mW active power keeps thermal EMF errors low in precision scales.
Được đề xuất
Panel Meter and Digital Instrumentation
Digital panel meters and bench-top multimeters require the resolution, accuracy, and bipolar input capability that the ADS7807PG4 delivers in a cost-effective 28-PDIP. Its +/-1.5 LSB INL and 16-bit no-missing-codes DNL enable 4.5-digit panel-meter accuracy without software calibration, and the parallel interface connects directly to legacy 8-bit microcontrollers used in meter main boards. The 50 uW power-down mode enables battery-powered handheld DMM designs that wake on demand.
Được đề xuất
Medical Patient Monitoring Front End
Portable patient monitoring equipment such as bedside vital-signs monitors and ambulatory ECG/EEG recorders benefit from the ADS7807PG4's combination of 16-bit resolution, 40 kSPS throughput, and 50 uW power-down current. The true-bipolar input range accepts +/-5 V biosignal-conditioned channels without extra level shifters. The internal sample-and-hold and clock remove the need for an external analog front-end timing controller, reducing BOM count in safety-critical medical designs.
Được đề xuất
Battery-Powered Portable Test Equipment
Field-portable data loggers and handheld calibration instruments benefit from the ADS7807PG4's 35 mW active / 50 uW power-down power profile, which is a 700:1 ratio that extends battery life between charges. The 16-bit resolution captures sensor signal dynamics accurately, and the 28-PDIP package withstands the mechanical and thermal stress of field service use. The wide +/-10 V input allows direct measurement of industrial sensors without scaling networks.
Được đề xuất
Audio Bandwidth Signal Analyzer
Audio-bandwidth signal analyzers covering 20 Hz to 20 kHz benefit from the ADS7807PG4's 86 dB SINAD (approximately 14 effective bits) and 40 kSPS sampling rate, which comfortably exceeds the Nyquist requirement for full audio bandwidth. The internal 2.5 V reference and the optional external-reference input give designers flexibility for absolute-accuracy audio measurements such as THD+N analyzers. The 16-bit no-missing-codes DNL prevents code-spreading artifacts in FFT plots.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS7807PG4 — 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 | ADS7807P | ADS7807U | ADS8507IDW | ADS8506IDW |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-PDIP | 28-PDIP - same | 28-PDIP - same | 28-SOIC | 28-SOIC | 28-SOIC |
| Resolution | 16 bits | 16 bits | 16 bits | 16 bits | 16 bits | 12 bits |
| Sampling Rate | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS |
| Input Range | +/-10 V / +/-5 V / 0-10 V / 0-4 V | +/-10 V / +/-5 V / 0-10 V / 0-4 V | +/-10 V / +/-5 V / 0-10 V / 0-4 V | +/-10 V / +/-5 V / 0-10 V / 0-4 V | +/-10 V / 0-4 V | +/-10 V / 0-4 V |
| Supply Voltage | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single | +5 V single |
| RoHS / Lead-Free | Yes (G4 = Green) | Yes (Pb-free matte-tin) | No (legacy SnPb) | No (legacy) | Yes | Yes |
Bảo phân biệt quan trọng
- Green/RoHS-compliant lead-free finish with identical die to legacy ADS7807P (vsADS7807P)
- True +/-10 V bipolar input range without external signal conditioning (vsADS8506IDW)
- 16-bit resolution at 40 kSPS in a legacy 28-PDIP through-hole package (vsADS8506IDW)
Ghi chú thiết kế
Bypass both VANA (pin 9) and VDIG (pin 10) with a 10 uF tantalum in parallel with a 0.1 uF ceramic capacitor placed within 5 mm of the supply pins. The separate analog and digital supply pins allow the user to insert a small ferrite bead or 10 ohm resistor between the analog and digital +5 V rails to prevent digital switching noise from coupling into the analog conversion result.
Use a star-ground topology tying AGND1 (pin 3) and DGND (pin 8) to a single point near the ADC. Keep analog input traces short and guarded with a ground trace to minimize digital-coupling noise pickup. The CAP pin (pin 7) requires a low-ESR 0.1 uF ceramic bypass to AGND; do not use electrolytic capacitors at this node because their leakage degrades the internal-reference accuracy.
The analog input source impedance must stay below the data-sheet maximum (typically 1 kohm) at the chosen acquisition time; higher source impedance causes INL degradation due to incomplete input settling. Do not drive the analog input with a signal exceeding +/-10 V or the ESD diodes will forward-conduct, distorting the conversion. Always pull PWDN (pin 11) low during normal operation; leaving it floating can cause the part to enter random power-down states.
When using the parallel interface, route D0-D15 on a single inner PCB layer with ground reference, and place 22-33 ohm series-termination resistors near the ADC outputs if the bus is longer than 50 mm. The BYTE (pin 16) and HBEN (pin 17) control the parallel-data width and must be tied to a known logic level (do not leave floating) to avoid bus contention on the output drivers.
Thông tin tuân thủ
G4 suffix indicates Green/RoHS-compliant lead-free packaging per TI's Pb-free transition. Operating temperature range -40C to +85C (industrial grade). Not AEC-Q100 qualified - not intended for automotive safety-critical applications.
