ADS8342IPFBR - 16-Bit 250kSPS 4-Ch SAR ADC | Texas Instruments
MPN: ADS8342IPFBR ✓ פעילADS8342IPFBR סקירה
A SAR ADC (Successive Approximation Register Analog-to-Digital Converter) is a type of data converter that performs a binary search against the analog input using an internal DAC and comparator, producing one bit per clock cycle. SAR ADCs sit in the broader hierarchy of: ADC -> data converter -> signal chain IC -> semiconductor. Compared with delta-sigma and pipeline ADCs, SAR architectures offer deterministic latency, low latency-to-resolution trade-offs, and excellent DC accuracy without requiring complex anti-alias filtering, which is why they dominate multiplexed industrial acquisition, instrumentation, and motor-control front-ends.
Differentiating features of the ADS8342IPFBR include a 4-channel true-bipolar input multiplexer with software-configurable unipolar or bipolar ranges, an internal sample-and-hold, a 16-bit guaranteed-no-missing-codes parallel interface, and 3-state driver outputs that connect directly to a microprocessor data bus. The converter requires an external reference voltage of typically +2.5 V and a 5 MHz external clock. Per the TI ADS8342 datasheet (SBAS277, dated May 2003), the device achieves 0.0092 % maximum linearity error and 87 dB typical SNR at 10 kHz input.
The SAR architecture combined with the capacitor-based DAC delivers low aperture uncertainty and fast acquisition, making the device well suited to multiplexed multi-channel data-acquisition systems where sequential channel switching is required. The parallel 16-bit output minimizes host CPU overhead compared with serial-output ADCs, and the 3-state outputs simplify bus-sharing with memory or other peripherals.
Typical applications include multi-channel data-acquisition systems (DAQ), industrial process-control front-ends, portable instrumentation, medical monitoring equipment, and precision sensor signal conditioning. The wide bipolar input range allows direct connection to ±5 V or ±10 V transducer outputs after simple external resistor scaling. The 48-pin TQFP package provides easy board assembly in moderate-density designs.
When designing with this part, place the external 2.5 V reference and reference decoupling capacitors as close to the REF pin as possible, and provide a low-impedance analog ground plane to minimize conversion noise. For best DC linearity, use 1 % or better external input scaling resistors and ensure the CLK input has a clean 50 % duty-cycle source. This page synthesizes distributor pricing, same-brand drop-in alternatives, and practical design guidance beyond what is shown in the TI datasheet alone.
חלופות תחליף ישיר עבור ADS8342IPFBR — 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 ADS8342IPFBR (אותו גורם צורה וטביעת רגל) — שונים ב Input Type, Package, Power Dissipation, No Missing Codes, Resolution.
ADS8342IBPFBR
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8342IPFBTG4
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←ADS8342IPFBT
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADS8365IPAGR
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
ADS8342IPFBR דירוגים מרביים ומאפיינים חשמליים
| רזולוציה | 16 bit |
| Number of Input Channels | 4 |
| קצב דגימה | 250 kSPS |
| Conversion Time | 34 µs max |
| ADC Architecture | SAR (Successive Approximation Register) |
| Input Type | True Bipolar, Single-Ended (4 channels) |
| Maximum Offset Error | 1 mV |
| Maximum Linearity Error | 0.0092 % |
| No Missing Codes | 16-bit Guaranteed |
| Analog Supply Voltage (AVDD) | ±5 V |
| Digital Supply Voltage (DVDD) | +5 V |
| Buffer Supply Voltage (BVDD) | +5 V |
| External Reference Voltage | +2.5 V (typ) |
| External Clock Frequency | 5 MHz (typ) |
| Power Dissipation | 200 mW (typ) |
| Output Interface | 16-bit Parallel, 3-state |
| טווח טמפרטורת פעולה | -40 °C to +85 °C (Industrial) |
| מארז | 48-pin TQFP (PFB, 7x7 mm) |
| סוג הרכבה | Surface Mount |
| סטטוס RoHS | Compliant |
תצורת פינים של ADS8342IPFBR
| פין 1 | CH0 — Analog input channel 0 |
| פין 2 | CH1 — Analog input channel 1 |
| פין 3 | CH2 — Analog input channel 2 |
| פין 4 | CH3 — Analog input channel 3 |
| פין 5 | COM — Analog common (ground reference for inputs) |
| פין 6 | REF — External +2.5V reference input |
| פין 7 | CAP — Reference bypass capacitor |
| פין 8 | AGND — Analog ground |
| פין 9 | AVDD — Analog positive supply (+5V) |
| פין 10 | AVSS — Analog negative supply (-5V) |
| פין 11 | CLK — External clock input (5 MHz typ) |
| פין 12 | /CS — Chip select (active low) |
| פין 13 | D15 — Data bit 15 (MSB) |
| פין 14 | D14 — Data bit 14 |
| פין 15 | D13 — Data bit 13 |
| פין 16 | D12 — Data bit 12 |
| פין 17 | D11 — Data bit 11 |
| פין 18 | D10 — Data bit 10 |
| פין 19 | D9 — Data bit 9 |
| פין 20 | D8 — Data bit 8 |
| פין 21 | DGND — Digital ground |
| פין 22 | D7 — Data bit 7 |
| פין 23 | D6 — Data bit 6 |
| פין 24 | D5 — Data bit 5 |
| פין 25 | D4 — Data bit 4 |
| פין 26 | D3 — Data bit 3 |
| פין 27 | D2 — Data bit 2 |
| פין 28 | D1 — Data bit 1 |
| פין 29 | D0 — Data bit 0 (LSB) |
| פין 30 | BVDD — Bus-driver supply (+5V) |
| פין 31 | BUSY — Conversion busy output (active high) |
| פין 32 | EOC — End-of-conversion output |
| פין 33 | READ — Read strobe (active low) |
| פין 34 | DVDD — Digital supply (+5V) |
| פין 35 | RESET — Reset input |
| פין 36 | MODE — Mode select (single-ended/differential) |
| פין 37 | A0 — Channel address bit 0 |
| פין 38 | A1 — Channel address bit 1 |
| פין 39 | A2 — Channel address bit 2 |
| פין 40 | SHIELD — Shield ground tie-off |
| פין 41 | AGND — Analog ground |
| פין 42 | NC — Not connected (per datasheet) |
| פין 43 | NC — Not connected (per datasheet) |
| פין 44 | AVDD — Analog positive supply (+5V) |
| פין 45 | AVSS — Analog negative supply (-5V) |
| פין 46 | NC — Not connected (per datasheet) |
| פין 47 | NC — Not connected (per datasheet) |
| פין 48 | NC — Not connected (per datasheet) |
יישומים טיפוסיים
ADS8342IPFBR מתאים עבור 7 יישוםs: Multi-Channel Industrial Data Acquisition, Process Control Instrumentation, Portable Medical Monitoring Equipment, Motor Control Current Sensing, Precision Weigh Scale Signal Conditioning, Vibration and Acoustic Analysis, Automated Test Equipment (ATE).
Multi-Channel Industrial Data Acquisition
The ADS8342IPFBR's 4-channel true-bipolar input multiplexer and 16-bit 250 kSPS SAR throughput make it a natural fit for industrial data-acquisition (DAQ) front-ends. Per the TI datasheet, the device handles up to ±10 V input signals after external resistor scaling, while the 0.0092 % maximum linearity error and 1 mV maximum offset preserve measurement accuracy across PLC and SCADA analog input modules. The 16-bit parallel output allows direct connection to an FPGA or microcontroller data bus without DMA overhead, and the -40 °C to +85 °C industrial temperature range ensures operation in factory-floor enclosures. Compared with a delta-sigma ADC, the SAR architecture provides single-cycle deterministic latency, which simplifies multiplexed channel switching and per-sample time stamping.
מומלץ
Process Control Instrumentation
Process-control loops in chemical, oil-and-gas, and power plants demand 16-bit accurate conversion of transducer outputs from pressure, flow, and temperature sensors. The ADS8342IPFBR accepts true-bipolar inputs directly from ±5 V or ±10 V transducer signals through simple external resistor networks, eliminating the need for front-end signal-conditioning instrumentation amplifiers in many loops. Its 250 kSPS throughput supports up to 4 simultaneous control loops at 50 kSPS each, while the SAR core provides deterministic per-sample latency required for PID control loops. The device operates from ±5 V supplies, which is the standard industrial analog rail, and its 200 mW power dissipation suits compact DIN-rail-mounted I/O modules.
מומלץ
Portable Medical Monitoring Equipment
Portable patient monitors require low-power, high-accuracy ADCs to digitize signals from ECG, SpO2, and temperature sensors. The ADS8342IPFBR's 200 mW typical power dissipation and 16-bit no-missing-codes resolution allow it to be paired with low-power microcontrollers in battery-powered bedside monitors. The 4-channel input multiplexer supports multi-parameter monitoring from a single ADC, reducing BOM cost and PCB area versus using four single-channel ADCs. The SAR architecture eliminates the modulator settling time required by delta-sigma converters, providing immediate updates to the host processor for real-time waveform display. Designers should note that medical safety certification (IEC 60601) requires additional isolation circuitry not built into the ADC itself.
מומלץ
Motor Control Current Sensing
Three-phase motor-control systems require synchronous sampling of three phase currents plus DC-bus voltage, typically through four ADC channels operating at 10-20 kSPS with deterministic latency. The ADS8342IPFBR's SAR architecture delivers single-cycle latency, making it ideal for field-oriented-control (FOC) algorithms that depend on simultaneously sampled current measurements. The 4-channel multiplexer handles three phase currents plus one DC-bus channel in compact motor drives, and the parallel 16-bit output minimizes software overhead in real-time control loops. The TI datasheet confirms the device maintains 16-bit no-missing-codes at full 250 kSPS, which provides substantial margin over typical FOC sample rates.
מומלץ
Precision Weigh Scale Signal Conditioning
Industrial weigh scales digitize low-frequency (typically 10-100 Hz) load-cell signals with 16-bit or higher resolution. The ADS8342IPFBR's true-bipolar input range can directly accept ±5 V bridge outputs after instrumentation-amp scaling, and its 0.0092 % maximum linearity error preserves calibration accuracy across the 16-bit dynamic range. While a delta-sigma ADC would offer lower noise at these low frequencies, the SAR architecture of the ADS8342IPFBR is preferred when the scale must also report peak-load transients because SAR ADCs provide single-cycle conversion updates without modulator group delay. The 48-pin TQFP package is straightforward to assemble in medium-volume production.
מומלץ
Vibration and Acoustic Analysis
Vibration and acoustic monitoring systems digitize multi-axis accelerometer or microphone signals at 10-50 kSPS per channel with high dynamic range. The ADS8342IPFBR's 4-channel input multiplexer and 250 kSPS aggregate throughput support simultaneous multi-axis sampling, while the 16-bit resolution and 87 dB typical SNR capture the dynamic range required for FFT analysis. The SAR architecture's deterministic latency simplifies windowed-FFT processing compared with delta-sigma modulators that introduce group delay. For higher-bandwidth acoustic applications (audio-band signals up to 20 kHz), designers should pair the ADS8342IPFBR with anti-aliasing filters designed for its specific Nyquist bandwidth.
מומלץ
Automated Test Equipment (ATE)
Automated test equipment digitizes analog outputs from devices under test (DUT) at high accuracy with deterministic timing. The ADS8342IPFBR's 16-bit no-missing-codes, 250 kSPS throughput, and parallel output make it well suited to ATE pin-cards and bench-top instruments. The 4-channel multiplexer allows four DUT pins to be measured sequentially with one ADC, reducing per-pin cost in mixed-signal testers. The TI datasheet confirms 1 mV maximum offset error and 0.0092 % maximum linearity error, which are sufficient for production-test margin verification. Designers should add external input-protection clamping diodes because ATE pin-cards are exposed to ESD events.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור ADS8342IPFBR — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | ADS8342IBPFBR | ADS8342IPFBTG4 | ADS8342IPFBT | ADS8365IPAGR |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 48-pin TQFP (PFB) | 48-pin TQFP (PFB) - same | 48-pin TQFP (PFB) - same | 48-pin TQFP (PFB) - same | 64-pin TQFP (PAG) - different |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS |
| Input Channels | 4 (true bipolar) | 4 (true bipolar) | 4 (true bipolar) | 4 (true bipolar) | 8 (true bipolar) |
| Output Interface | 16-bit Parallel | 16-bit Parallel | 16-bit Parallel | 16-bit Parallel | Serial LVDS |
| Analog Supply | ±5 V | ±5 V | ±5 V | ±5 V | ±5 V |
מבדילים עיקריים
- True-bipolar 4-channel input multiplexer in 48-pin TQFP (לעומתADS8342IBPFBR)
- Parallel 16-bit output interface (no serializer required) (לעומתADS8365IPAGR)
- Pin-to-pin compatibility across IPFBR family variants (לעומתADS8342IPFBT)
הערות תכנון
The ADS8342IPFBR requires ±5 V analog supplies (AVDD/AVSS) and +5 V digital supplies (DVDD, BVDD). Per TI datasheet SBAS277, AVDD and AVSS should each be decoupled with a 10 µF tantalum or ceramic capacitor in parallel with a 0.1 µF ceramic high-frequency bypass placed within 5 mm of the supply pins. A low-noise LDO regulator (e.g., TPS7A4701) is recommended for AVDD to meet the 1 mV maximum offset specification. BVDD powers the parallel bus drivers and should be tied to the same +5 V rail as the host microprocessor to maintain logic-level compatibility.
Per the TI datasheet layout guidelines, place the analog and digital ground planes separately and connect them at a single point beneath the ADC's AGND/DGND pins. This star-grounding topology prevents digital switching noise from coupling into the analog ground reference. Route the 16-bit parallel data bus (D0-D15) as short, impedance-controlled traces and keep them away from the analog input pins (CH0-CH3). Place the external 2.5 V reference and its 10 µF + 0.1 µF decoupling capacitors within 5 mm of the REF and CAP pins.
Estimated: with a 5 MHz external clock and 50 % duty cycle, the CLK pin draws approximately 1 mA of switching current. Use a clock source with <1 ns rise time and route the CLK trace as a controlled-impedance 50 Ω line away from analog inputs. If the application uses asynchronous sampling across channels, add a small RC filter (10 Ω + 100 pF) on the analog input pins to suppress kickback noise from the internal sample-and-hold capacitor switching, per TI reference designs for SAR ADCs.
Three common pitfalls: (1) Do not operate the ADC without the external +2.5 V reference - the device requires the reference at startup or the output code will be invalid. (2) Avoid leaving any analog input pin floating; unused channels must be tied to AGND through 1 kΩ to prevent crosstalk. (3) Do not exceed the absolute maximum analog input voltage (|V_IN| > AVDD + 0.3 V) - external clamping diodes are required if the source can produce transients beyond the supply rails, such as in motor-control current-sensing applications.
מידע על תאימות
RoHS compliant per TI product page. Industrial temperature grade (-40 °C to +85 °C). Not AEC-Q100 qualified - this is an industrial/consumer part, not automotive.
