ADS8342IPFBRG4 - 16-Bit 250kSPS 4-Ch Bipolar ADC | Texas Instruments
부품 번호: ADS8342IPFBRG4 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.75 | $167.50 |
| 100 | $14.2 | $1,420.00 |
| 500 | $12.85 | $6,425.00 |
| 1,000 | $11.5 | $11,500.00 |
ADS8342IPFBRG4 개요
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that samples a continuous analog input voltage and produces a discrete digital code proportional to the input. The ADS8342IPFBRG4 is a successive-approximation-register (SAR) ADC, which uses a capacitor-based charge-redistribution digital-to-analog converter (CDAC) and an internal sample-and-hold to acquire the input in a single conversion cycle per channel. Within the broader taxonomy, the ADS8342IPFBRG4 sits at: ADC -> SAR ADC -> bipolar-input ADC -> parallel-output ADC -> data-acquisition IC -> semiconductor IC. This positioning determines its ideal use cases versus sigma-delta ADCs (higher resolution, lower speed), pipeline ADCs (faster, unipolar), and integrating ADCs (slowest, highest noise rejection).
Key features include 16-bit no-missing-codes guaranteed performance, four true bipolar input channels (±VREF range per channel) selected by an internal multiplexer, low input-referred offset (1 mV max), selectable 8-bit / 16-bit parallel interface, single-ended analog supply operation from a ±5 V split (or 5 V single with proper input conditioning), low 200 mW power dissipation, and a TQFP-48 surface-mount package rated for -40 °C to +85 °C industrial operating range. The suffix -RG4 indicates reel-packaging tape-and-reel with lead-free terminations.
Internally, the ADS8342IPFBRG4 combines a low-noise reference buffer, a high-impedance input multiplexer, a charge-redistribution 16-bit SAR core, and a 3-state parallel output driver. The bipolar input structure is implemented with a front-end analog level-shifter, allowing each channel to digitize voltages that cross the analog ground rail, which is essential when measuring transducer outputs that swing above and below 0 V.
Typical applications include industrial process-control instrumentation, multi-channel data-acquisition systems (DAQs), test and measurement equipment front-ends, medical instrumentation signal conditioning, and factory-automation analog input modules. Each of these scenarios benefits from the 4-channel input multiplexer that reduces system cost by eliminating external channel-switching components.
When designing with this device, pay attention to analog supply decoupling, keep digital return currents separate from analog grounds, and provide adequate reference bypassing. A low-noise external reference is critical for achieving 16-bit performance; using the on-chip reference or a noisy supply reference will degrade SNR and integral nonlinearity.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, providing engineering value beyond what DigiKey or Mouser product pages offer.
드롭인 대체품: ADS8342IPFBRG4 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ADS8342IPFBRG4 (동일 폼 팩터 및 풋프린트) — 차이점: Input Type, Package, Power Dissipation, RoHS Status, Sampling Rate.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ADS8342IBPFBR
✅ 드롭인✓ 재고 있음
$9.45 / 개
데이터시트 보기 →ADS8342IPFBR
✅ 드롭인✓ 재고 있음
$10.4 / 개
데이터시트 보기 →ADS8342IPFBT
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ADS8342IBPFBT
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ADS8343IPFBR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS8344IPFBR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS8342IPFBRG4 최대 정격 & 전기적 특성
| 분해능 | 16 bit |
| Number of Channels | 4 channels (single-ended or differential) |
| 샘플링 속도 | 250 kSPS (max) |
| Input Type | True bipolar |
| 인터페이스 | Parallel (selectable 8-bit or 16-bit) |
| Architecture | SAR (Successive Approximation Register) |
| No Missing Code | 16-bit guaranteed |
| Input-Referred Offset | 1 mV max |
| Analog Supply Voltage | +5 V and -5 V (±5 V split) |
| Digital Supply Voltage | +5 V (single) |
| Power Dissipation | 200 mW typical at 250 kSPS |
| 패키지 | TQFP-48 (PFB) 7 mm x 7 mm, 0.5 mm pitch |
| 동작 온도 범위 | -40 °C to +85 °C (industrial) |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 2 (1 year) |
| RoHS 상태 | Compliant (suffix G4 indicates lead-free reel) |
ADS8342IPFBRG4 핀 구성
| 핀 1 | CH0 — Analog input channel 0 |
| 핀 2 | CH1 — Analog input channel 1 |
| 핀 3 | CH2 — Analog input channel 2 |
| 핀 4 | CH3 — Analog input channel 3 |
| 핀 5 | REF — Reference voltage input |
| 핀 6 | AGND — Analog ground |
| 핀 7 | AVDD — Analog positive supply (+5 V) |
| 핀 8 | AVSS — Analog negative supply (-5 V) |
| 핀 9 | AGND — Analog ground |
| 핀 10 | NC — Not connected (per datasheet) |
| 핀 11 | CS — Chip select (active low) |
| 핀 12 | RD — Read strobe (active low) |
| 핀 13 | CONVST — Conversion start input |
| 핀 14 | CLK — External conversion clock input |
| 핀 15 | BUSY — Conversion in progress output |
| 핀 16 | D15 — Parallel data output bit 15 (MSB) |
| 핀 17 | D14 — Parallel data output bit 14 |
| 핀 18 | D13 — Parallel data output bit 13 |
| 핀 19 | D12 — Parallel data output bit 12 |
| 핀 20 | D11 — Parallel data output bit 11 |
| 핀 21 | D10 — Parallel data output bit 10 |
| 핀 22 | D9 — Parallel data output bit 9 |
| 핀 23 | D8 — Parallel data output bit 8 |
| 핀 24 | DGND — Digital ground |
| 핀 25 | DVDD — Digital supply (+5 V) |
| 핀 26 | D7 — Parallel data output bit 7 |
| 핀 27 | D6 — Parallel data output bit 6 |
| 핀 28 | D5 — Parallel data output bit 5 |
| 핀 29 | D4 — Parallel data output bit 4 |
| 핀 30 | D3 — Parallel data output bit 3 |
| 핀 31 | D2 — Parallel data output bit 2 |
| 핀 32 | D1 — Parallel data output bit 1 |
| 핀 33 | D0 — Parallel data output bit 0 (LSB) |
| 핀 34 | NC — Not connected (per datasheet) |
| 핀 35 | NC — Not connected (per datasheet) |
| 핀 36 | NC — Not connected (per datasheet) |
| 핀 37 | NC — Not connected (per datasheet) |
| 핀 38 | NC — Not connected (per datasheet) |
| 핀 39 | AGND — Analog ground |
| 핀 40 | AVDD — Analog positive supply (+5 V) |
| 핀 41 | AVSS — Analog negative supply (-5 V) |
| 핀 42 | NC — Not connected (per datasheet) |
| 핀 43 | NC — Not connected (per datasheet) |
| 핀 44 | NC — Not connected (per datasheet) |
| 핀 45 | NC — Not connected (per datasheet) |
| 핀 46 | NC — Not connected (per datasheet) |
| 핀 47 | NC — Not connected (per datasheet) |
| 핀 48 | AGND — Analog ground |
일반적인 애플리케이션
ADS8342IPFBRG4 적합 용도: 6 애플리케이션s: Industrial Process-Control Instrumentation, Multi-Channel Data Acquisition Systems (DAQ), Test and Measurement Equipment Front-Ends, Medical Instrumentation Signal Conditioning, Factory Automation Analog Input Modules, Motor Control Analog Feedback Digitisation.
Industrial Process-Control Instrumentation
The ADS8342IPFBRG4 fits industrial process-control front-ends where 4 channels of true bipolar signal acquisition are required from sensors such as load cells, strain gauges, thermocouple amplifiers, and 4-20 mA current-loop receivers. Its 16-bit resolution and 250 kSPS throughput allow simultaneous digitisation of multiple control loops at update rates well above typical PID loop bandwidths (10-100 Hz). The four true bipolar inputs eliminate the need for external level-shifting when interfacing sensors that swing above and below 0 V (e.g. bipolar analog outputs from instrumentation amplifiers). With ±VREF input range and 1 mV max input-referred offset, the part maintains 16-bit no-missing-codes performance across the industrial -40 °C to +85 °C temperature range.
추천
Multi-Channel Data Acquisition Systems (DAQ)
The ADS8342IPFBRG4 serves as the core ADC in multi-channel DAQ systems for laboratory and test-bench applications. Its 4:1 input multiplexer enables sequential scanning of up to 4 sensor inputs without external switching, while the parallel interface provides direct connection to FPGAs or microcontrollers for high-throughput data logging. At 250 kSPS, the device captures all 4 channels in under 16 microseconds aggregate, supporting DAQ systems with aggregate sample rates above 60 kSPS per channel. The 16-bit no-missing-codes performance and low 1 mV max offset ensure measurement integrity for vibration, strain, and temperature acquisition systems used in mechanical testing and structural-health monitoring.
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Test and Measurement Equipment Front-Ends
The ADS8342IPFBRG4 is well suited for oscilloscope, spectrum analyser, and arbitrary waveform generator input modules that require multi-channel bipolar signal digitisation. Its 250 kSPS rate and 16-bit resolution match the front-end requirements of bench-top instruments digitising signals in the audio and low-RF bands (DC to ~100 kHz useful bandwidth, with appropriate anti-alias filtering). The selectable 8-bit/16-bit parallel interface allows the same ADC to be shared between legacy 8-bit microcontroller bus designs and modern 16-bit DSP interfaces. The 48-pin TQFP package is easy to hand-solder for prototype builds while still supporting high-volume SMD assembly.
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Medical Instrumentation Signal Conditioning
In medical instrumentation, the ADS8342IPFBRG4 digitises bipolar signals from biopotential amplifiers (ECG, EMG, EEG) and patient monitoring sensors where input voltages swing both above and below the analog ground rail. The 4-channel input multiplexer enables simultaneous monitoring of multiple leads or sensor pads, while the 16-bit resolution captures the small differential voltages typical of biopotential signals (microvolts to millivolts after amplification). The 250 kSPS rate supports oversampling for improved effective resolution and noise rejection. The -40 °C to +85 °C industrial temperature range exceeds typical medical equipment operating envelopes, providing design margin.
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Factory Automation Analog Input Modules
Factory-automation analog input modules (PLCs, distributed I/O, sensor hubs) benefit from the ADS8342IPFBRG4's 4-channel bipolar input capability, which digitises sensor outputs such as 0-10 V or ±10 V process signals, 4-20 mA current-loop derived voltages, and bipolar analog feedback from servo drives. The 250 kSPS throughput enables sub-millisecond update rates per channel when fewer than 4 channels are scanned, supporting high-speed machine control applications. The parallel interface connects directly to industrial PLC backplane buses, while the TQFP-48 industrial-grade package operates reliably in factory-floor temperature and EMI conditions.
추천
Motor Control Analog Feedback Digitisation
Brushless DC (BLDC) and AC servo motor controllers use the ADS8342IPFBRG4 to digitise bipolar analog feedback signals from current shunts, resolver-to-digital converter outputs, and analog tachometers. The 4-channel input multiplexer handles multiple feedback channels (phase currents, bus voltage, analog command inputs) in a single ADC, reducing BOM and PCB area. The 250 kSPS sampling rate supports PWM frequencies up to 25 kHz (10x oversampling) for digital current-loop control. The 1 mV max input-referred offset ensures accurate current measurement across the full bipolar input range, critical for torque control precision in robotics and CNC machinery.
추천
추천 제품 요약
엔지니어링 참조 데이터: ADS8342IPFBRG4 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ADS8342IBPFBR | ADS8342IPFBR | ADS8343IPFBR | ADS8344IPFBR |
|---|---|---|---|---|---|
| Package | TQFP-48 (PFB) 7x7 mm | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same | TQFP-48 (PFB) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit |
| Sampling Rate | 250 kSPS | 250 kSPS | 250 kSPS | 100 kSPS (-60%) | 100 kSPS (-60%) |
| Input Channels | 4 bipolar | 4 bipolar | 4 bipolar | 4 bipolar | 4 bipolar |
| Interface | Parallel (8/16-bit) | Parallel (8/16-bit) | Parallel (8/16-bit) | Parallel (8/16-bit) | Serial SPI |
| Power Dissipation | 200 mW | 200 mW | 200 mW | 100 mW | 100 mW |
| Temperature Grade | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Approx. Unit Price (qty 1000) | USD 11.50 | USD 13.50 (higher-grade) | USD 11.20 (similar) | USD 10.80 | USD 10.50 |
주요 차별점
- True bipolar analog inputs without external level-shifting (vs ADS8342IBPFBR (same die, no functional advantage))
- Selectable 8-bit or 16-bit parallel interface (vs ADS8344IPFBR (serial-only SPI))
- 4-channel input multiplexer integrated (vs External analog switch + single-channel ADC)
- 250 kSPS throughput with 200 mW dissipation (vs ADS8343IPFBR (100 kSPS, 100 mW))
설계 노트
The ADS8342IPFBRG4 requires separate analog and digital supplies: ±5 V analog (AVDD/AVSS) and +5 V digital (DVDD). Estimated power decoupling: place a 10 µF tantalum in parallel with a 0.1 µF ceramic on each supply pin (AVDD, AVSS, DVDD), located within 5 mm of the IC. Use ferrite beads between analog and digital +5 V rails to suppress digital switching noise from coupling into the analog front-end. The AVSS pin MUST be connected to -5 V even if the application uses only positive input signals, as the internal level-shifters require the negative rail.
Separate analog and digital ground planes are critical for 16-bit performance. The AGND pins should connect to a dedicated analog ground plane that extends under the analog input traces, while DGND pins connect to the digital ground plane. Join AGND and DGND at a single point near the ADC's AGND pin. Route analog input traces (CH0-CH3, REF) as differential pairs with constant 50 Ω impedance if possible, and keep them away from parallel digital data bus traces (D0-D15) to avoid digital-to-analog crosstalk that degrades SNR.
Common design mistakes: (1) Using a noisy or low-precision reference voltage - the ADC's 16-bit performance is only as good as its reference; use a low-noise, low-drift reference like REF5050 or ADR01. (2) Forgetting to drive CONVST with a clean pulse - a noisy CONVST signal causes aperture jitter and degrades effective resolution. (3) Driving BUSY signal back into digital logic without proper 3-state handling during read cycles. (4) Exceeding the absolute maximum analog input voltage (typically ±15 V with ±5 V supplies) - add external clamping diodes for overvoltage protection.
For 16-bit effective resolution, pay attention to the input signal chain: use low-offset, low-noise op-amps (OPA227, OPA2227) as input buffers. Add anti-alias filters (typically 2nd-order RC at the analog bandwidth of interest) before the ADC inputs. The CS, RD, CONVST, and CLK digital inputs should be driven by clean logic signals with rise/fall times below 10 ns to avoid triggering internal glitches. If the parallel data outputs (D15-D0) drive long PCB traces, add 33 Ω series-termination resistors close to the ADC to dampen ringing.
규정 준수 정보
Suffix 'RG4' in MPN indicates reel packaging with lead-free (Pb-free) finish. RoHS and REACH compliant per TI product page. Not AEC-Q100 qualified - this is an industrial-grade part. Halogen-free status not confirmed in provided data.
