ADC0848CCVX - 8-Bit, 8-Ch, 25kS/s µP-Compatible SAR ADC | Texas Instruments
MPN: ADC0848CCVX ✗ Cuối đờiADC0848CCVX Tóm tắt
An ADC (analog-to-digital converter) of the successive-approximation register (SAR) type performs a binary-search conversion against an internal capacitor array and an external reference, settling in a fixed number of clock cycles regardless of the input value. The 8-channel input multiplexer can be software-configured for single-ended, differential, or pseudo-differential operation, allowing the part to replace many discrete signal-conditioning paths in mixed-signal systems. The ADC0848 family occupies a tier of low-to-medium-speed, multi-channel data-acquisition building blocks between simple delta-sigma sensors and higher-throughput pipelined ADCs, and it is a member of the broader class of power-management-adjacent data-conversion ICs in the mixed-signal/Power Management/Analog category hierarchy.
Key features include 8 input channels software-selectable as either 8 single-ended or 4 differential pairs (plus 2 pseudo-differential modes), an external reference input with a minimum input resistance of approximately 1.1 kΩ, an on-chip clock generator that can operate from an internal RC or external clock, and TTL/CMOS-compatible digital inputs and outputs. The differential mode provides common-mode rejection and pseudo-differential modes allow arbitrary input spans, which makes the part flexible across 0 to +5 V single-supply and bipolar sensor interfaces.
The architecture uses a charge-redistribution SAR core with a built-in sample-and-hold and a successive-approximation register. Conversion is initiated by the WR-to-RD cycle on the parallel interface, and the result is latched onto the data bus. A separate VREF pin sets the full-scale range; in ratiometric systems the reference can be tied to the excitation of a bridge sensor so that supply variation cancels out, a hallmark of the SAR/multiplexer topology.
Typical applications include process-control analog front ends reading 4-20 mA-derived voltages, multi-channel panel-meter and instrumentation data acquisition, portable or battery-powered data loggers, and embedded industrial sensor interfaces where an 8-bit microcontroller needs to digitize several transducer outputs without adding a complex sigma-delta part. Automotive and white-goods subsystems historically use this family for low-cost monitoring.
When designing with this device, treat the reference input carefully: it must be driven by a low-impedance source capable of supplying the required reference current (the datasheet specifies a 1.1 kΩ minimum input resistance). Decouple VCC and VREF with local 0.1 µF ceramic capacitors, place the analog and digital grounds on a single star, and avoid driving the analog inputs beyond the rails. In noisy environments, average multiple conversions in firmware to extract the last 1-2 LSBs that an 8-bit SAR inherently leaves undecided.
This page synthesizes distributor pricing, pinout details, drop-in alternatives, and practical design notes that are not consolidated in any single manufacturer or distributor listing.
Bộ thay thế dễ dàng lắp đặt cho ADC0848CCVX — 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 ADC0848CCVX (cùng hình factor và footprint) — khác nhau ở Number of Input Channels, Operating Temperature, Package, Sampling Rate, Data Interface.
ADC0848BCN/NOPB
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC0848CCN/NOPB
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ADC0844CCN/NOPB
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC0838CCVX
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ADC0834BCN/NOPB
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ADC0831CCWM
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ADC0848CCVX Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 8 bit |
| Number of Input Channels | 4 / 8 (single-ended or differential) |
| Converter Type | SAR (Successive Approximation) |
| Tỷ lệ lấy mẫu | approximately 25 kS/s |
| Điện áp cung cấp | 4.5 V to 6 V (single +5 V typical) |
| Analog Input Modes | Single-ended, differential, pseudo-differential |
| Reference Input Resistance (min) | 1.1 kΩ |
| Điện áp tham chiếu | external, applied to VREF pin |
| Digital Interface | Parallel, microprocessor-compatible |
| Digital I/O Logic Levels | TTL/CMOS compatible |
| On-chip Clock | Internal RC or external clock input |
| Hộp | 28-pin PLCC (11.51 x 11.51 mm) |
| Khoảng nhiệt độ hoạt động | 0°C to +85°C (commercial) |
| Kiểu lắp đặt | Surface Mount |
Cấu hình chân ADC0848CCVX
| 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 | CH4 — Analog input channel 4 |
| Chân 6 | CH5 — Analog input channel 5 |
| Chân 7 | CH6 — Analog input channel 6 |
| Chân 8 | CH7 — Analog input channel 7 |
| Chân 9 | AGND — Analog ground |
| Chân 10 | VREF — Voltage reference input |
| Chân 11 | VCC — +5 V analog supply |
| Chân 12 | CLK — Clock input (or RC at this pin) |
| Chân 13 | DGND — Digital ground |
| Chân 14 | CS — Chip select (active low) |
| Chân 15 | RD — Read strobe (active low) |
| Chân 16 | WR — Write / start conversion (active low) |
| Chân 17 | D0 — Data bit 0 (LSB) |
| Chân 18 | D1 — Data bit 1 |
| Chân 19 | D2 — Data bit 2 |
| Chân 20 | D3 — Data bit 3 |
| Chân 21 | D4 — Data bit 4 |
| Chân 22 | D5 — Data bit 5 |
| Chân 23 | D6 — Data bit 6 |
| Chân 24 | D7 — Data bit 7 (MSB) |
| Chân 25 | MUX — Multiplexer mode select |
| Chân 26 | DIFF — Differential mode select |
| Chân 27 | TEST — Test pin (per datasheet) |
| Chân 28 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
ADC0848CCVX phù hợp cho 6 Áp dụngs: Process-Control Analog Front End, Panel Meter and Instrumentation Data Acquisition, Portable Data Logger, Embedded Industrial Sensor Interface, White-Goods and Appliance Control, Automotive Sensor Module (Legacy).
Process-Control Analog Front End
The ADC0848CCVX digitizes 4-20 mA-derived or 0-5 V transducer voltages in PLCs, DCS modules, and SCADA RTUs. With 8 input channels configurable as 4 differential pairs and an external VREF that can be tied to the bridge excitation for ratiometric cancellation, it suits pressure, flow, and level transmitters. The 8-bit, ~25 kS/s SAR throughput is sufficient for control loops at 100-1000 Hz update rates, and the parallel microprocessor interface glues directly to legacy 8051/68xx-style hosts. Decouple VCC and VREF with local 0.1 µF ceramics and use a star ground to keep digital return currents away from analog inputs.
Được đề xuất
Panel Meter and Instrumentation Data Acquisition
Digital multimeters, bench-top panel meters, and laboratory instrumentation front ends use the ADC0848CCVX to multiplex several analog inputs into one ADC. The 8-channel multiplexer replaces multiple discrete ADCs, and the differential/pseudo-differential modes reject ground loops in noisy bench environments. Using the on-chip RC clock keeps the BOM small, while the parallel bus allows direct connection to the meter's display controller. For an 8-bit reading displayed as 0-199.9 counts on a 3.5-digit DPM, this part delivers more than enough resolution while minimizing component count and firmware complexity.
Được đề xuất
Portable Data Logger
Battery-powered handheld data loggers for environmental monitoring use the ADC0848CCVX to sample temperature, humidity, and battery-voltage channels at low duty cycle. The single +5 V supply, parallel interface that can be disabled when idle, and external reference support let the designer trade throughput for quiescent power. Eight channels at ~25 kS/s aggregate bandwidth is plenty for slow-moving sensor channels, and the SAR architecture gives deterministic latency that simplifies time-stamping in firmware. Place a ferrite bead on VCC and bulk-decouple at the battery terminal to suppress conducted noise from the boost converter.
Được đề xuất
Embedded Industrial Sensor Interface
Industrial sensor interfaces on factory-floor controllers use the ADC0848CCVX to digitize proximity, photoelectric, and limit-switch signals after analog conditioning. The pseudo-differential input mode simplifies wiring by tolerating ground potential differences between the sensor and the controller. The parallel bus maps cleanly onto an 8-bit microcontroller external-memory interface, eliminating the need for an SPI peripheral. Combined with a 5 V regulator and TVS protection on each analog input, this part supports a robust industrial front end at low BOM cost.
Được đề xuất
White-Goods and Appliance Control
Washing machines, dishwashers, and refrigerator controllers use the ADC0848CCVX to read thermistor, water-level, motor-current, and user-knob potentiometer inputs. The 8 channels handle all mainboard analog signals with one ADC, and the differential mode is ideal for reading a Wheatstone-bridge pressure sensor in the appliance. The +5 V single supply is compatible with the 5 V microcontroller common in legacy appliance designs. Hardware designers value the PLCC-28 footprint for through-hole-friendly socket-mount repairability, an advantage in the appliance service market.
Được đề xuất
Automotive Sensor Module (Legacy)
Legacy automotive modules - body controllers, climate-control panels, and simple instrument clusters - use the ADC0848CCVX to read multiple 5 V sensor signals. The differential mode is well suited to wheel-speed and throttle-position sensing where ground shifts are common, and the SAR architecture provides deterministic conversion latency for synchronous sampling. Although newer automotive designs target AEC-Q100-qualified parts, this TI part remains in service designs that already have firmware and PCB layout locked around the PLCC-28 footprint.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADC0848CCVX — 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 | ADC0848BCN/NOPB | ADC0848CCN/NOPB | ADC0844CCN/NOPB | ADC0838CCVX | ADC0834BCN/NOPB |
|---|---|---|---|---|---|---|
| Package | 28-PLCC (11.51 x 11.51 mm) | 28-PLCC - same | 28-PLCC - same | 28-PLCC - same | 28-PLCC - same | 28-PLCC - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit |
| Input Channels | 8 | 8 | 8 | 4 | 8 | 4 |
| Converter Type | SAR | SAR | SAR | SAR | SAR | SAR |
| Sampling Rate | ~25 kS/s | ~25 kS/s | ~25 kS/s | ~25 kS/s | ~31 kS/s | ~31 kS/s |
| Supply Voltage | 4.5 V to 6 V | 4.5 V to 6 V | 4.5 V to 6 V | 4.5 V to 6 V | 4.5 V to 6 V | 4.5 V to 6 V |
| Differential Input Mode | Yes (4 pairs) | Yes | Yes | Yes (2 pairs) | Limited | Limited |
Bảo phân biệt quan trọng
- True 8-channel differential multiplexer in PLCC-28 (vsADC0844CCN/NOPB)
- Differential and pseudo-differential input modes (vsADC0838CCVX)
- Same die across PLCC variants for design reuse (vsADC0848BCN/NOPB)
Ghi chú thiết kế
Decouple VCC with a 10 µF tantalum bulk plus a 0.1 µF ceramic placed as close as practical to the VCC pin. The VREF pin is even more sensitive: a noisy reference directly couples into conversion noise, so place a 0.1 µF (or larger) ceramic directly on VREF and drive it from a low-impedance buffer such as a TL431ACDBZR. Avoid tying VREF to the noisy digital +5 V rail.
Use a star-ground topology with the ADC0848CCVX AGND and DGND pins returned to a single point near the IC. Keep digital return currents (D0-D7, RD, WR, CS) physically separated from analog input traces. Route analog input traces as differential pairs in the differential/pseudo-differential modes, and guard them with ground pours to reject switching noise from the microprocessor bus.
Do not leave analog inputs floating - unused channels should be tied to mid-supply or AGND through a 10 kΩ resistor to avoid unpredictable channel-to-channel crosstalk. Do not drive analog inputs beyond VCC + 0.3 V or below AGND - 0.3 V; this can forward-bias the input ESD structure and corrupt ongoing conversions. For ratiometric measurements, tie VREF to the bridge excitation so that excitation drift cancels in the conversion result.
Place the ADC0848CCVX as close as possible to the analog input connectors to minimize trace length and pickup. Keep the parallel data bus short, and add 33 Ω series resistors on D0-D7 near the ADC to dampen bus ringing if the bus length exceeds 50 mm. Avoid routing analog and digital signals on adjacent layers without a ground plane between them.
Thông tin tuân thủ
Lifecycle is NRND per TI product page. RoHS/REACH/lead-free status was not explicitly provided in the verified web data and is marked [DATA_NEEDED] in specs. The NOPB suffix on alternative part numbers indicates lead-free finish.
