ADC0848BCVX - 8-Bit 8-Ch Microprocessor-Compatible ADC | TI
MPN: ADC0848BCVX ✓ פעילADC0848BCVX סקירה
A successive-approximation ADC (SAR ADC) is a type of data converter that determines each bit of the digital output by binary-searching the analog input against an internal DAC and comparator. SAR ADCs sit in the broader hierarchy: ADC -> data converter -> signal chain IC -> mixed-signal semiconductor. The ADC0848 family occupies the classic 8-bit, low-speed, multi-channel data-acquisition niche, offering deterministic latency and ease of microprocessor interfacing that pipelined and delta-sigma ADCs typically sacrifice.
Key features include software-configurable single-ended, differential, or pseudo-differential input modes, an on-chip sample-and-hold, ratiometric or absolute voltage reference operation, and a microprocessor-compatible parallel interface with read/write control lines. The 28-PLCC (FN) J-lead package is a plastic-leaded chip carrier that provides easy prototyping and socket compatibility while exposing enough thermal pad area for the modest dissipation of this CMOS device.
The ADC0848 uses a switched-capacitor successive-approximation architecture built on a CMOS process, which keeps power consumption low (typically well under 10 mW) and eliminates the need for an external negative supply. The differential input mode enables common-mode noise rejection in industrial environments where long sensor runs pick up 50/60 Hz interference, while pseudo-differential mode simplifies PCB layout for ground-referenced sensors.
Typical applications include industrial process-control analog front-ends, multi-channel sensor multiplexing in factory automation, panel-meter and instrumentation data acquisition, portable battery-powered measurement devices, and legacy microprocessor-based embedded systems where deterministic conversion timing is required. The 8-channel mux eliminates external analog switches in most designs.
When designing with this part, ensure the reference pin is driven from a low-impedance source (datasheet requires >=1.1 kOhm drive capability) and place 0.1 uF decoupling close to the supply pins. For ratiometric operation, use the same excitation voltage for the sensor bridge and the VREF pin to cancel reference drift.
חלופות תחליף ישיר עבור ADC0848BCVX — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם ADC0848BCVX (אותו גורם צורה וטביעת רגל) — שונים ב Number of Input Channels, Package, Reference Input Resistance (min), Reference Voltage, Resolution.
ADC0848BCVX/NOPB
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADC0848CCVX
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADC0848CCV
✅ Drop-In ⚠️ מפרטים לא מאומתים📋 חלופה להתייחסות (לא בקטלוג)
ADC0848BCVX דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 8 bits |
| Number of Input Channels | 8 (configurable to 4 differential) |
| Architecture | Successive Approximation (SAR) |
| קצב דגימה | 25 kSPS (min), up to ~33 kSPS |
| Conversion Time (max) | 60 us |
| Data Interface | Parallel (microprocessor-compatible) |
| Input Modes | Single-ended, differential, pseudo-differential |
| מתח ייחוס | 2.5 V to VCC (ratiometric or absolute) |
| Reference Input Resistance (min) | 1.1 kOhm |
| Supply Voltage (VCC) | 4.5 V to 6.0 V (typ. 5 V) |
| טמפרטורת פעולה | -40C to +85C (industrial) |
| מארז | 28-PLCC (FN) J-lead, 11.51 x 11.51 mm |
| מספר פינים | 28 |
| סוג הרכבה | Surface Mount |
| סטטוס RoHS | Compliant (NOPB suffix variant) |
| On-Chip Sample-and-Hold | Yes |
תצורת פינים של ADC0848BCVX
| פין 1 | CH1 — Analog input channel 1 |
| פין 2 | CH2 — Analog input channel 2 |
| פין 3 | CH3 — Analog input channel 3 |
| פין 4 | CH4 — Analog input channel 4 |
| פין 5 | CH5 — Analog input channel 5 |
| פין 6 | CH6 — Analog input channel 6 |
| פין 7 | CH7 — Analog input channel 7 |
| פין 8 | AGND — Analog ground |
| פין 9 | VREF — Voltage reference input (>=1.1 kOhm drive required) |
| פין 10 | VCC — Positive supply (4.5 V to 6.0 V) |
| פין 11 | DGND — Digital ground |
| פין 12 | DB0 — Data output bit 0 (LSB) |
| פין 13 | DB1 — Data output bit 1 |
| פין 14 | DB2 — Data output bit 2 |
| פין 15 | DB3 — Data output bit 3 |
| פין 16 | DB4 — Data output bit 4 |
| פין 17 | DB5 — Data output bit 5 |
| פין 18 | DB6 — Data output bit 6 |
| פין 19 | DB7 — Data output bit 7 (MSB) |
| פין 20 | /CS — Chip select (active low) |
| פין 21 | /RD — Read strobe (active low) |
| פין 22 | /WR — Write / conversion start (active low) |
| פין 23 | CLK IN — Clock input |
| פין 24 | CLK R — Clock resistor (sets internal clock frequency) |
| פין 25 | INTR — Interrupt output (active low, signals conversion complete) |
| פין 26 | CH0 — Analog input channel 0 |
| פין 27 | NC — Not connected (per datasheet) |
| פין 28 | NC — Not connected (per datasheet) |
יישומים טיפוסיים
ADC0848BCVX מתאים עבור 6 יישוםs: Industrial Process Control Analog Front-End, Multi-Channel Sensor Multiplexing Data Acquisition, Panel Meter and Instrumentation Readout, Portable Battery-Powered Measurement Devices, Legacy Microprocessor-Based Embedded Systems, Automotive Sensor Interface Modules.
Industrial Process Control Analog Front-End
The ADC0848BCVX fits industrial PLC analog input modules because of its 8 single-ended (or 4 differential) input channels that eliminate external analog multiplexers, its -40C to +85C industrial temperature range per the TI datasheet, and its software-configurable differential mode that rejects common-mode noise on long sensor cable runs. With 60 us conversion time and ~25-33 kSPS throughput, it comfortably digitizes 4-20 mA loop signals, thermocouple breakouts, and pressure-transducer outputs at PLC scan rates of 10-100 Hz. Placed behind RC anti-alias filters on each CHx pin, the SAR architecture provides deterministic conversion latency that simplifies PLC ladder-logic timing.
מומלץ
Multi-Channel Sensor Multiplexing Data Acquisition
The ADC0848BCVX's 8-channel analog multiplexer and software-programmable channel selection make it a single-chip solution for multi-transducer DAQ boards in factory automation and instrumentation. Differential input mode rejects 50/60 Hz line interference picked up on long sensor cables - critical for thermocouple and strain-gauge bridges. The ratiometric reference capability allows excitation voltage and VREF to track together, cancelling bridge excitation drift. With 25 kSPS throughput it can sequentially scan 8 channels at 3 kHz each, sufficient for vibration monitoring and slow process control loops.
מומלץ
Panel Meter and Instrumentation Readout
Digital panel meters and bench-top multimeters benefit from the ADC0848BCVX's parallel microprocessor interface and 8-channel input mux, allowing a single ADC to read multiple measurement ranges (volts, amps, temperature) selected via the front-panel rotary switch. The 8-bit resolution provides 1 part in 256 (0.4%) accuracy - adequate for 3-digit panel-meter displays. Its 60 us conversion time updates the display faster than human perception, eliminating visible flicker. The CMOS process keeps power dissipation low, suiting battery-powered handheld instruments.
מומלץ
Portable Battery-Powered Measurement Devices
Portable field measurement instruments use the ADC0848BCVX because its CMOS SAR architecture draws only milliwatts of supply current, extending battery life in handheld data loggers and environmental monitors. The 4.5-6.0 V single-supply operation pairs with 4 x AA alkaline or single Li-ion cell arrangements. With 8 input channels, a single ADC scans temperature, humidity, pressure, and flow sensors in weather stations and portable gas detectors. The 28-PLCC package is compact enough for handheld enclosures.
מומלץ
Legacy Microprocessor-Based Embedded Systems
The ADC0848BCVX is designed for direct connection to 8-bit microprocessors such as the 8051, 68HC11, Z80, and similar legacy MCUs via its parallel data bus and /CS, /RD, /WR control lines. Deterministic SAR conversion timing makes software drivers straightforward - no complex FIFO or DMA management is required. Educational kits, vintage industrial controllers, and retro-computing projects benefit from the well-documented timing diagrams in the TI ADC0844/ADC0848 datasheet. The 28-PLCC package allows socketed prototyping on through-hole adapter boards.
מומלץ
Automotive Sensor Interface Modules
While not AEC-Q100 qualified, the ADC0848BCVX is used in non-safety automotive applications such as cabin environmental sensors, battery management telemetry, and aftermarket gauge clusters. Its pseudo-differential input mode simplifies PCB layout for ground-referenced automotive sensors, while the wide -40C to +85C operating range handles underhood and cabin temperature extremes. The 8-channel mux interfaces directly with multiple sensor types (temperature, pressure, position) on a single ADC, reducing BOM cost in cost-sensitive automotive aftermarket designs.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ADC0848BCVX — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ADC0848BCVX/NOPB | ADC0848CCVX | ADC0848CCV | ADC0844CCN/NOPB | ADC0838CCN/NOPB |
|---|---|---|---|---|---|---|
| Package | 28-PLCC (FN) J-lead | 28-PLCC (FN) - same | 28-PLCC (FN) - same | 28-PLCC (FN) - same | 20-PDIP (N) - different | 20-PDIP (N) - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits | 8 bits |
| Number of Channels | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 8 single-ended / 4 differential | 4 single-ended / 2 differential | 8 single-ended / 4 differential (serial I/F) |
| Sampling Rate | ~25-33 kSPS | ~25-33 kSPS | ~25-33 kSPS | ~25-33 kSPS | ~25-33 kSPS | ~25 kSPS |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Serial (SPI/MICROWIRE) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| RoHS Compliance | Requires NOPB suffix | Compliant | Check suffix | Check suffix | Compliant | Compliant |
מבדילים עיקריים
- 8-channel input multiplexer eliminates external analog switches (לעומתADC0844CCN/NOPB)
- Software-configurable input modes provide design flexibility (לעומתADC0838CCN/NOPB)
- Pb-free NOPB variant available for RoHS designs (לעומתADC0848BCV (no NOPB))
- Industry-standard 28-PLCC socket-compatible package (לעומתADC0834BCN/NOPB (20-DIP))
הערות תכנון
Estimated: Power dissipation is approximately P = VCC x ICC. With VCC=5V and typical ICC estimated at 5 mA based on the CMOS SAR architecture, Pdiss ~= 25 mW. Decouple VCC with a 0.1 uF ceramic capacitor placed within 5 mm of the VCC pin and a bulk 1-10 uF electrolytic on the same node. Per the TI ADC0848 datasheet, the VREF pin requires a low-impedance drive capable of at least 1.1 kOhm - use a dedicated reference IC or buffer op-amp, not a high-impedance resistive divider.
Separate analog ground (AGND, pin 8) and digital ground (DGND, pin 11) returns to a single-point star ground near the ADC to avoid digital switching noise coupling into analog inputs. Place anti-alias RC low-pass filters (typically 1 kOhm + 1 nF, fc ~160 kHz) on each CHx input close to the pin. Keep analog input traces short and away from digital output bus traces (DB0-DB7) which carry fast edges during read cycles. The 28-PLCC J-lead package allows socketed prototyping - use a Mill-Max 28-pin PLCC socket for easy replacement during firmware bring-up.
Do not drive VREF from a high-impedance source - the datasheet specifies a minimum 1.1 kOhm drive capability is required, otherwise conversion accuracy suffers. In ratiometric applications, use the same excitation voltage (typically 5V) for both the sensor bridge and VREF so that supply drift cancels. Do not leave unused analog input channels floating - tie them to AGND or a known mid-rail voltage to prevent spurious coupling. The /WR pin initiates conversion; ensure software provides adequate delay between /WR and reading DBx per the timing diagram in the TI datasheet (typically 60 us max conversion time).
The DB0-DB7 parallel outputs drive CMOS logic levels; in long-trace designs add 33-100 Ohm series damping resistors near the ADC outputs to dampen ringing on fast rising edges. The /INTR output (active low, signals end-of-conversion) should be pulled up with a 4.7-10 kOhm resistor to VCC if wired-OR'd with other interrupt sources. When using the differential input mode, ensure the common-mode voltage stays within the input common-mode range (typically AGND to VCC); exceeding it saturates the input sampling capacitor and produces erroneous conversions.
מידע על תאימות
The non-NOPB ADC0848BCVX contains lead (Pb) in the finish and is NOT RoHS compliant; for RoHS-compliant designs use ADC0848BCVX/NOPB. Not AEC-Q100 qualified - not suitable for automotive safety applications. REACH compliance per TI product declaration.
