ADS7824PG4 - 4-Ch 12-Bit 40kSPS SAR ADC | Texas Instruments
MPN: ADS7824PG4 ✓ Hoạt độngADS7824PG4 Tóm tắt
A successive-approximation register ADC is a comparator-based converter that performs a binary search against the input voltage, one bit per clock cycle, producing a complete 12-bit result in a fixed number of conversion cycles. Within the broader data-converter taxonomy, the ADS7824PG4 sits between precision delta-sigma converters (which trade speed for resolution) and high-speed flash converters (which trade resolution and power for sample rate). SAR ADCs are favored where single-shot deterministic latency, modest resolution, and low power consumption must coexist, as in multiplexed industrial sensor acquisition.
Key features include a guaranteed 25 us max acquisition-and-conversion time, 50 mW max power dissipation from a single +5 V supply, ±10 V industrial input range with on-chip laser-trimmed scaling resistors, ±0.5 LSB linearity, ±0.1% channel-to-channel matching, and a 4-channel single-ended or pseudo-differential input mux. The internal 2.5 V reference and clock eliminate the need for external analog support components in most designs.
Typical applications include industrial process-control PLCs, multi-loop data acquisition systems, multi-channel instrumentation front-ends, and pin-compatible upgrades for legacy ADS7825 16-bit designs. The wide ±10 V input range allows direct connection to industrial ±10 V transducers and 4-20 mA loop sense resistors without external signal conditioning.
Bộ thay thế dễ dàng lắp đặt cho ADS7824PG4 — 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 ADS7824PG4 (cùng hình factor và footprint) — khác nhau ở Package, Data Interface, Sampling Rate, Number of Input Channels, Resolution.
ADS7824P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7825P
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS7807PBG4
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADS7824PG4 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 12 bits |
| Number of Channels | 4 (single-ended / pseudo-differential) |
| Tỷ lệ lấy mẫu | 40 kSPS |
| Conversion Time | 25 us max |
| Architecture | SAR (Successive Approximation) |
| Phạm vi điện áp đầu vào | ±10 V (industrial, on-chip scaled) |
| Channel-to-Channel Matching | ±0.1% |
| Linearity (INL) | ±0.5 LSB max |
| Điện áp cung cấp | +5 V single supply |
| Power Dissipation | 50 mW max |
| Data Interface | Parallel + Serial |
| Reference | Internal 2.5 V |
| Khoảng nhiệt độ hoạt động | -40C to +85C |
| Hộp | 28-pin PDIP (N) 0.300 inch, through-hole |
| Lead-Free / RoHS | Yes (G4 suffix, Pb-free) |
Cấu hình chân ADS7824PG4
| Chân 1 | CH0 — Analog input channel 0 |
| Chân 2 | CH1 — Analog input channel 1 |
| Chân 3 | CH2 — Analog input channel 2 |
| Chân 4 | CH3 — Analog input channel 3 |
| Chân 5 | AGND — Analog ground |
| Chân 6 | REF — Internal 2.5 V reference output / bypass |
| Chân 7 | DGND — Digital ground |
| Chân 8 | VCC — +5 V analog/digital supply |
| Chân 9 | R/C — Read/Convert input |
| Chân 10 | CS — Chip select (active low) |
| Chân 11 | BUSY — Conversion in progress (active high) |
| Chân 12 | HBEN — High-byte enable for parallel read |
| Chân 13 | DB11/MSB — Data bit 11 / MSB |
| Chân 14 | DB10 — Data bit 10 |
| Chân 15 | DB9 — Data bit 9 |
| Chân 16 | DB8 — Data bit 8 |
| Chân 17 | DB7 — Data bit 7 |
| Chân 18 | DB6 — Data bit 6 |
| Chân 19 | DB5 — Data bit 5 |
| Chân 20 | DB4 — Data bit 4 |
| Chân 21 | DB3 — Data bit 3 |
| Chân 22 | DB2 — Data bit 2 |
| Chân 23 | DB1 — Data bit 1 |
| Chân 24 | DB0/LSB — Data bit 0 / LSB |
| Chân 25 | SDAT — Serial data output |
| Chân 26 | SCLK — Serial clock input |
| Chân 27 | SYNC — Synchronization input |
| Chân 28 | DGND — Digital ground |
Ứng dụng tiêu biểu
ADS7824PG4 phù hợp cho 6 Áp dụngs: Industrial Process Control PLCs, Multi-Channel Data Acquisition Systems, 4-20 mA Current Loop Monitoring, Multi-Channel Instrumentation Front-Ends, Pin-Compatible Legacy ADS7825 Upgrades, SCADA Remote Terminal Units (RTUs).
Industrial Process Control PLCs
The ADS7824PG4's 4-channel multiplexed inputs and ±10 V industrial input range make it ideally suited for programmable logic controller analog input modules. With on-chip laser-trimmed scaling resistors accepting ±10 V directly, it eliminates the need for external signal-conditioning op-amps for transducer signals such as pressure, flow, and level sensors. The 25 us conversion time and 40 kSPS sampling rate comfortably exceed the typical update rates of <100 Hz in industrial loops, while the 50 mW power dissipation allows the module to operate from a single +5 V PLC backplane rail. Multiple channels share one converter, reducing BOM cost and board area for compact PLC designs.
Được đề xuất
Multi-Channel Data Acquisition Systems
For multi-channel data acquisition boards serving 4-32 channels, the ADS7824PG4 offers a compact front-end via its built-in 4-channel mux and parallel/serial interface. The internal 2.5 V reference and clock reduce external component count, while ±0.1% channel-to-channel matching allows uniform measurement without per-channel calibration. Eight ADS7824PG4 devices can share a serial bus to expand to 32 channels without address-decoding logic, supporting applications such as multi-zone temperature monitoring, distributed strain gauge arrays, and laboratory instrumentation front-ends with deterministic single-shot 25 us conversion time.
Được đề xuất
4-20 mA Current Loop Monitoring
The ADS7824PG4's 4-channel input mux and ±10 V input range directly accommodate 4-20 mA current loops when terminated with a 250 ohm sense resistor, producing a 1-5 V signal that falls well within the ADC's input span. Each of the four channels can monitor an independent loop, and the 25 us conversion time means an entire 4-channel scan completes in approximately 100 us, far faster than the <1 Hz loop update requirement. The ±0.5 LSB integral nonlinearity ensures accurate process variable digitization, while the internal reference eliminates long-term calibration drift typical of ratiometric measurement chains.
Được đề xuất
Multi-Channel Instrumentation Front-Ends
Portable test and measurement instruments that read multiple sensors simultaneously benefit from the ADS7824PG4's 4-channel mux and parallel/serial dual interface. The -40C to +85C industrial temperature range supports laboratory and field-deployed use, while ±0.5 LSB linearity preserves measurement fidelity for strain gauges, thermocouple amplifiers (post-cold-junction compensation), and bridge sensors. Internal scaling to ±10 V allows the same board to handle both low-level and industrial signal levels, simplifying the analog front-end and reducing component count.
Được đề xuất
Pin-Compatible Legacy ADS7825 Upgrades
The ADS7824PG4 is explicitly pin-compatible with the ADS7825 family (per TI datasheet footnote referencing 16-bit converters in the ADS family), allowing designers to drop the ADS7824PG4 onto existing ADS7825 16-bit layouts when cost or power budget is prioritized over resolution. The same scaling, multiplexer, and digital interface are preserved, so firmware updates are unnecessary. This makes the ADS7824PG4 attractive for cost-reduced variants of established industrial products where 12-bit resolution is provably sufficient.
Được đề xuất
SCADA Remote Terminal Units (RTUs)
SCADA remote terminal units operating in unmanned field enclosures value the ADS7824PG4's robustness through its industrial temperature grade and ±10 V input tolerance for protection against field transients. The 4-channel mux lets a single ADC service temperature, pressure, level, and flow transmitters in an RTU, with the ±0.1% channel-to-channel matching ensuring consistent conversion across transmitters of the same type. Power dissipation at 50 mW max also helps passive cooling in sealed enclosures where convection is limited, supporting long-life field deployment.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS7824PG4 — 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 | ADS7824P | ADS7824U | ADS7825P | ADS7825U | ADS7807PBG4 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 28-PDIP (N) through-hole | 28-PDIP (N) through-hole - same | 28-SOIC (DW) - different | 28-PDIP (N) - same | 28-SOIC (DW) - different | 28-PDIP (N) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 16 bits | 16 bits | 16 bits |
| Number of Channels | 4 | 4 | 4 | 4 | 4 | 1 |
| Sampling Rate | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS | 40 kSPS |
| Input Voltage Range | +/-10 V | +/-10 V | +/-10 V | +/-10 V | +/-10 V | +/-10 V |
| Conversion Time | 25 us max | 25 us max | 25 us max | 25 us max | 25 us max | 25 us max |
| Pb-Free (G4 suffix) | Yes | No (standard marking) | No | No | No | Yes |
| Approx. Unit Price (qty 1) | $18.50 | $18.00 | $17.20 | $22.00 | $21.00 | $19.80 |
Bảo phân biệt quan trọng
- Pin-compatible 16-bit upgrade path (vsADS7825P)
- Integrated 4-channel input multiplexer (vsADS7807PBG4 (single-channel 16-bit))
- Pb-free G4 suffix for lead-free compliance (vsADS7824P (non-G4))
- Dual parallel and serial interfaces (vsADS7822PG4 (serial-only))
Ghi chú thiết kế
The ADS7824PG4 operates from a single +5 V supply with 50 mW max power dissipation. Decouple VCC to DGND with a 10 uF tantalum + 0.1 uF ceramic bypass placed close to the supply pin. For high-noise industrial environments, add a ferrite bead between the +5 V rail and the IC VCC pin. The internal 2.5 V reference output (REF) should be buffered with a 10 uF external capacitor; do not load the REF pin with more than a few hundred microamps or reference accuracy degrades. Estimated: typical quiescent current is ~10 mA at +5 V, well within the 50 mW max envelope.
On a 28-PDIP board, dedicate one plane layer to AGND (pins 5 and 28 ground connection point) and another to DGND, joining them at a single point near the +5 V regulator ground return. Keep analog input traces (CH0-CH3, AGND) routed away from digital control signals (CS, R/C, BUSY, SCLK) to avoid clock feedthrough into the sample-and-hold. Place the REF bypass capacitor directly across pin 6 (REF) and pin 5 (AGND); trace length should be less than 5 mm to minimize reference noise pickup.
Common pitfalls include (1) forgetting to convert SDAT during a parallel mode read, which can cause bus contention - the datasheet recommends tying SDAT to a defined logic level if unused; (2) drawing more than ~500 uA from the internal REF pin causes INL degradation across all four channels; (3) cycling CS faster than the conversion time, which forces BUSY to ignore the read and produce stale data; and (4) using the ADS7824PG4 outside its -40C to +85C temperature range, which compromises ±0.5 LSB linearity. Per the datasheet, latching HBEN with the wrong polarity during a parallel read can latch the high byte into the low byte bus, scrambling the conversion result.
Thông tin tuân thủ
G4 suffix denotes Pb-free, RoHS-compliant lead finish. AEC-Q100 not applicable for industrial data acquisition. Halogen-free marking not explicitly stated in verified data.
