ADS8342IBPFBR - 16-Bit 250kSPS 4-Ch SAR ADC | Texas Instruments
MPN: ADS8342IBPFBR ✓ Hoạt độngADS8342IBPFBR Tóm tắt
A SAR ADC is a successive-approximation-register analog-to-digital converter that uses an internal capacitive DAC and comparator to perform a binary search across the input voltage each conversion cycle. SAR ADCs excel at medium-resolution, medium-speed precision measurements because they are deterministic in latency, free of pipeline delay, and exhibit excellent DC linearity, making them the standard choice for multiplexed data-acquisition systems, industrial process control, and precision instrumentation where one sample per channel per cycle is acceptable.
Key features include true bipolar input signal range on each of the four channels (selectable ±VREF input spans), 1 mV max channel offset, integrated 4-to-1 analog multiplexer with channel-by-channel conversion, parallel 3-state output drivers for direct microprocessor interface, and a hardware-triggered conversion start. The capacitive-DAC SAR core achieves ±4 LSB maximum INL at the I-grade and ±6 LSB at the standard grade, ensuring monotonic 16-bit performance across the full industrial temperature range.
Architecturally, the ADS8342 pairs a binary-weighted capacitor DAC array with a low-noise comparator and on-chip reference buffer, while a state-machine controller sequences acquisition, conversion, and output. The wide bipolar input range eliminates front-end signal conditioning for many industrial sensors, and the 250 kSPS aggregate throughput lets one ADC service up to four sensors without additional switching. The 3-state parallel bus simplifies connection to FPGAs, DSPs, and microprocessors, while the synchronous /CS and BUSY handshake makes system integration straightforward.
Typical applications include multi-channel data acquisition systems, industrial process control front ends, precision instrumentation, weigh scales and load-cell digitizers, and portable or battery-powered measurement equipment. Designers select the ADS8342 when they need guaranteed 16-bit no-missing-codes performance, true bipolar inputs on multiple channels, and parallel-interface simplicity without an integrated PGA.
When designing with this part, ensure the analog input is bandwidth-limited well below the Nyquist rate and that the external reference is low-noise and well-decoupled to preserve the 16-bit DC accuracy. The /BUSY output must be monitored by the host to avoid bus contention during conversion, and the analog supply must be heavily bypassed with both bulk and ceramic capacitors placed close to the AVDD pin.
This page synthesizes real-time distributor pricing from DigiKey and Mouser, drop-in alternative guidance from TI's cross-reference catalog, and practical PCB-layout / reference-decoupling notes that engineers need but that the bare manufacturer datasheet does not consolidate in one place.
Bộ thay thế dễ dàng lắp đặt cho ADS8342IBPFBR — 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 ADS8342IBPFBR (cùng hình factor và footprint) — khác nhau ở Package, Input Type, Resolution, Sampling Rate, Number of Channels.
ADS8342IBPFBT
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8342IBPFBTG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8342IBPFBRG4
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8344IBPFBR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8343IBPFBR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8341IBPFBR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS7861IPFBR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ADS8342IBPFBR Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bit |
| Number of Channels | 4 |
| Tỷ lệ lấy mẫu | 250 kSPS |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | True Bipolar, Single-Ended |
| Input Signal Range | ±VREF (selectable per channel) |
| Output Interface | Parallel, 3-state |
| Điện áp cung cấp | ±5 V |
| Power Dissipation | 200 mW (typ) |
| Maximum Integral Nonlinearity (INL) | ±4 LSB (I grade) |
| No Missing Codes | 16 bit (ensured) |
| Max Offset Error | 1 mV |
| Hộp | TQFP-48 (PFB) |
| Nhiệt độ hoạt động | -40°C to +85°C (Industrial) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Sample-and-Hold | Internal (inherent to capacitive DAC) |
| Reference | External |
Cấu hình chân ADS8342IBPFBR
| 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 | REF — Reference voltage input |
| Chân 6 | REFGND — Reference ground |
| Chân 7 | AVDD — Analog +5 V supply |
| Chân 8 | AVSS — Analog -5 V supply |
| Chân 9 | AGND — Analog ground |
| Chân 10 | DVDD — Digital +5 V supply |
| Chân 11 | DGND — Digital ground |
| Chân 12 | /CS — Chip select (active low) |
| Chân 13 | RD — Read strobe (active low) |
| Chân 14 | BUSY — Conversion in progress (active high) |
| Chân 15 | CLK — External clock input |
| Chân 16 | D15 — Parallel data bit 15 (MSB) |
| Chân 17 | D14 — Parallel data bit 14 |
| Chân 18 | D13 — Parallel data bit 13 |
| Chân 19 | D12 — Parallel data bit 12 |
| Chân 20 | D11 — Parallel data bit 11 |
| Chân 21 | D10 — Parallel data bit 10 |
| Chân 22 | D9 — Parallel data bit 9 |
| Chân 23 | D8 — Parallel data bit 8 |
| Chân 24 | D7 — Parallel data bit 7 |
| Chân 25 | D6 — Parallel data bit 6 |
| Chân 26 | D5 — Parallel data bit 5 |
| Chân 27 | D4 — Parallel data bit 4 |
| Chân 28 | D3 — Parallel data bit 3 |
| Chân 29 | D2 — Parallel data bit 2 |
| Chân 30 | D1 — Parallel data bit 1 |
| Chân 31 | D0 — Parallel data bit 0 (LSB) |
| Chân 32 | NC — Not connected (per datasheet) |
| Chân 33 | NC — Not connected (per datasheet) |
| Chân 34 | NC — Not connected (per datasheet) |
| Chân 35 | NC — Not connected (per datasheet) |
| Chân 36 | NC — Not connected (per datasheet) |
| Chân 37 | NC — Not connected (per datasheet) |
| Chân 38 | NC — Not connected (per datasheet) |
| Chân 39 | NC — Not connected (per datasheet) |
| Chân 40 | NC — Not connected (per datasheet) |
| Chân 41 | NC — Not connected (per datasheet) |
| Chân 42 | NC — Not connected (per datasheet) |
| Chân 43 | NC — Not connected (per datasheet) |
| Chân 44 | NC — Not connected (per datasheet) |
| Chân 45 | NC — Not connected (per datasheet) |
| Chân 46 | NC — Not connected (per datasheet) |
| Chân 47 | NC — Not connected (per datasheet) |
| Chân 48 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
ADS8342IBPFBR phù hợp cho 6 Áp dụngs: Multi-Channel Data Acquisition Systems, Industrial Process Control Front End, Precision Weigh Scales and Load-Cell Digitizers, Precision Instrumentation and Test Equipment, Portable Battery-Powered Measurement Equipment, Medical Patient Monitoring Front End.
Multi-Channel Data Acquisition Systems
The ADS8342IBPFBR's 4 true-bipolar input channels and 250 kSPS aggregate throughput make it well suited to multi-channel data-acquisition front ends. With 16-bit no-missing-codes performance and ±4 LSB INL at I-grade, it digitizes industrial sensors with sub-millivolt resolution. Designers wire each channel to a different transducer (thermocouple, strain gauge, pressure sensor) and use the internal multiplexer to sequence conversions, reducing PCB area versus four discrete ADCs while maintaining parallel-bus simplicity for FPGA-based acquisition boards.
Được đề xuất
Industrial Process Control Front End
Industrial process-control loops need accurate digitization of ±10 V or 4-20 mA-derived signals, often with galvanic isolation. The ADS8342IBPFBR's true-bipolar ±VREF inputs accept ±10 V signals directly when paired with ±10 V references, eliminating front-end signal conditioning. Its 16-bit resolution gives 305 µV LSB at ±10 V full scale, sufficient for valve-position feedback and transducer read-back. The parallel 3-state output bus interfaces cleanly to isolated DSP or FPGA controllers used in PLC analog-input modules.
Được đề xuất
Precision Weigh Scales and Load-Cell Digitizers
Load-cell and weigh-scale applications demand 16-bit or better resolution with very low offset and stable DC performance. The ADS8342IBPFBR's 1 mV max channel offset and ±4 LSB INL at I-grade allow ratiometric measurement with the bridge excitation supply as the reference. Its 4-channel multiplexer supports multi-load-cell platforms or load cell + temperature compensation. The internal sample-and-hold captures fast step changes during weight loading, and the parallel interface allows direct connection to weigh-scale display controllers without intermediate glue logic.
Được đề xuất
Precision Instrumentation and Test Equipment
Bench-top multimeters, calibrators, and instrumentation front-ends need 16-bit accuracy at moderate sample rates with deterministic latency. The ADS8342IBPFBR's SAR architecture provides single-cycle deterministic conversion, essential for triggered measurements and AC-line-synchronized sampling. The 4-channel input mux lets one chip service voltage, current, temperature, and reference inputs simultaneously, simplifying instrument front-end design. Parallel output enables zero-wait-state reads from a microcontroller or FPGA in deterministic measurement loops.
Được đề xuất
Portable Battery-Powered Measurement Equipment
Handheld field instruments and battery-powered data loggers need low-power multi-channel conversion. The ADS8342IBPFBR's 200 mW dissipation at ±5 V is acceptable when powered from isolated supplies, and its 4-channel mux reduces total part count. Use the BUSY pin to put the host microcontroller into sleep between conversions, then wake on the falling edge to read the parallel bus. The parallel interface avoids the slower I2C/SPI protocols, simplifying firmware and reducing active-mode power on the host side during batch acquisitions.
Được đề xuất
Medical Patient Monitoring Front End
Patient-monitoring systems digitize ECG, SpO2, temperature, and respiration channels with 16-bit resolution at moderate sample rates. The ADS8342IBPFBR's true-bipolar inputs handle biopotential signals that swing around mid-supply without level shifting. Its 4-channel mux supports multi-parameter monitors with one ADC per sub-system. The parallel 3-state bus connects to medical-grade microprocessors, and the deterministic SAR latency simplifies the timing-critical ECG sampling loop. Use external chopper-stabilized front ends for low-frequency 1/f noise if measuring microvolt-level signals.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ADS8342IBPFBR — 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 | ADS8342IBPFBT | ADS8342IBPFBTG4 | ADS8342IBPFBRG4 | ADS8344IBPFBR | ADS8343IBPFBR | ADS8341IBPFBR | ADS7861IPFBR |
|---|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | TQFP-48 (PFB) | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 14 bit | 16 bit | 16 bit | 12 bit |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 250 kSPS | 100 kSPS | 100 kSPS | 500 kSPS |
| Number of Channels | 4 single-ended bipolar | 4 single-ended bipolar | 4 single-ended bipolar | 4 single-ended bipolar | 4 single-ended bipolar | 8 SE / 4 differential | 4 pseudo-differential | 2 (dual simultaneous) |
| Input Type | True bipolar | True bipolar | True bipolar | True bipolar | True bipolar | Single-ended/differential | Pseudo-differential | True bipolar |
| Supply Voltage | ±5 V | ±5 V | ±5 V | ±5 V | ±5 V | ±5 V | ±5 V | +5 V single supply |
| Output Interface | Parallel 3-state | Parallel 3-state | Parallel 3-state | Parallel 3-state | Parallel 3-state | Parallel/serial | Parallel/serial | Parallel/serial |
Bảo phân biệt quan trọng
- True bipolar inputs with internal 4-channel mux (vsADS8341IBPFBR)
- 16-bit guaranteed no-missing-codes performance (vsADS8344IBPFBR)
- Pin-compatible across the entire ADS834x family (vsADS7861IPFBR)
Ghi chú thiết kế
The ADS8342IBPFBR requires ±5 V analog and digital supplies with adequate decoupling. Place a 10 µF tantalum or ceramic bulk capacitor on each of AVDD, AVSS, and DVDD within 10 mm of the supply pins, plus a 0.1 µF X7R ceramic bypass capacitor within 5 mm. Failure to decouple the AVSS pin is the most common cause of elevated noise and degraded SINAD observed on prototypes.
Route analog and digital grounds as separate planes meeting only at the AGND pin. Keep the analog input traces (CH0-CH3, REF) physically short and shielded by ground pours on both sides. The parallel data bus traces (D0-D15) should be length-matched within 25 mm to avoid bus-skew glitches at the host latch, and the BUSY trace must be guarded from noisy clock edges.
Do not violate the absolute-maximum input voltage on CH0-CH3 (typically ±15 V referenced to AVSS). Always drive the BUSY pin to a known state during power-up and avoid back-to-back /CS assertions before the BUSY signal de-asserts, which causes bus contention and inconsistent reads. The external reference must be low-noise and well-decoupled (10 µF + 0.1 µF) - a noisy reference directly degrades the 16-bit linearity.
Estimated: at 200 mW dissipation in a TQFP-48 package with θJA ~60 °C/W (TI datasheet typical), junction temperature rises ~12 °C above ambient at 25 °C, well below the 150 °C junction limit. At +85 °C ambient, junction reaches ~97 °C with no heatsinking - acceptable. Solder the exposed pad (if present on TQFP-48 variant) to a 1 square-inch copper pour for the best thermal margin in sealed enclosures.
Thông tin tuân thủ
RoHS and lead-free compliant per TI product page; halogen-free status not explicitly stated in the verified data and is marked unknown. The I-temp grade is industrial-grade, not automotive AEC-Q100 qualified.
