ADS7835EB/2K5G4 - 12-Bit 500kHz Low-Power SAR ADC | Texas Instruments
부품 번호: ADS7835EB/2K5G4 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $6.1 | $6.10 |
| 10 | $5.45 | $54.50 |
| 100 | $4.82 | $482.00 |
| 500 | $4.2 | $2,100.00 |
| 1,000 | $3.75 | $3,750.00 |
ADS7835EB/2K5G4 개요
A SAR ADC is a successive-approximation-register analog-to-digital converter - a type of data converter that uses a binary-search algorithm and an internal DAC to digitize an analog input one bit at a time per clock cycle, achieving deterministic latency and excellent DC accuracy without the latency or pipeline delay of pipeline ADCs. The ADS7835 family sits in the hierarchy: SAR ADC -> data converter (ADC) -> signal chain IC -> semiconductor. The internal 2.5 V bandgap reference eliminates an external reference component, and the synchronous serial interface minimizes pin count while supporting high-speed readback to an MCU or DSP.
The key differentiating features of the ADS7835EB/2K5G4 versus competing 12-bit 500 kHz SAR ADCs are its 17.5 mW active / 2.5 mW shutdown power budget, an integrated 2.5 V reference (saving a discrete reference IC and ~$0.30 BOM cost), 8-pin MSOP packaging, and TI's long-term manufacturing support for the Burr-Brown™-heritage data-converter line. The "EB" suffix indicates the 8-pin MSOP (VSSOP) package with exposed pad, while the trailing "/2K5G4" indicates 2,500-unit tape-and-reel packaging with a Pb-free / RoHS-compliant finish.
The synchronous serial data format and 500 kHz sample rate make the ADS7835EB/2K5G4 well suited to multi-channel data-acquisition systems, optical-module monitoring, and portable instrumentation that require a single +5 V rail, small PCB footprint, and predictable latency. Typical applications include portable multi-channel data loggers, wireless handset battery monitoring, optical-network power monitoring, and spectrum-analyzer IF digitizers where low power and small size are mandatory.
When designing with this ADC, place a 0.1 µF ceramic bypass capacitor within 2 mm of the +VD pin, keep analog and digital grounds joined at a single star point beneath the exposed pad, and observe a 100 ns minimum acquisition time by clocking SCLK at or below the 500 kHz / 12-bit envelope. Add a 10 µF tantalum bulk capacitor on the analog supply if the source impedance exceeds 5 Ω to prevent reference droop during conversions.
드롭인 대체품: ADS7835EB/2K5G4 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: ADS7835EB/2K5G4 (동일 폼 팩터 및 풋프린트) — 차이점: Architecture, Mounting Type, RoHS Status, Number of Input Channels, Digital Interface.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
ADS7835EB/2K5
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS7835E/2K5G4
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS7835E/250G4
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS7822EB/250G4
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
ADS7822PG4
✅ 드롭인✓ 재고 있음
$3.2 / 개
데이터시트 보기 →ADS7825PG4
✅ 드롭인✓ 재고 있음
$7.2 / 개
데이터시트 보기 →ADS7835EB/2K5G4 최대 정격 & 전기적 특성
| 분해능 | 12 bits |
| Architecture | Successive Approximation (SAR) |
| Sample Rate (Throughput) | 500 kSPS |
| Number of Input Channels | 1 single-ended |
| 입력 전압 범위 | -VREF to +VREF (bipolar, 0 V to +5 V with VREF=2.5 V) |
| Internal Reference | 2.5 V |
| 공급 전압 | +5 V single supply |
| Active Power Dissipation | 17.5 mW at 500 kSPS |
| Power-Down Dissipation | 2.5 mW |
| Digital Interface | Synchronous serial (SPI/QSPI/MICROWIRE-compatible) |
| No Missing Codes | Guaranteed 12-bit |
| Package Type | 8-pin MSOP (VSSOP) with exposed pad |
| 실장 유형 | Surface Mount |
| 동작 온도 범위 | -40 C to +85 C (industrial) |
| Packaging | Tape and Reel, 2,500 pieces per reel |
| RoHS 상태 | Compliant (Pb-free finish, G4 suffix) |
ADS7835EB/2K5G4 핀 구성
| 핀 1 | +VD — Analog supply (+5 V). Bypass with 0.1 µF ceramic + 10 µF tantalum. |
| 핀 2 | +IN — Analog input, range -VREF to +VREF. |
| 핀 3 | GND — Analog and digital ground reference. |
| 핀 4 | REF — Reference input/output (internal 2.5 V reference; bypass with 1 µF). |
| 핀 5 | -VD — Digital supply (typically tied to +VD or separate +5 V). |
| 핀 6 | DOUT — Serial data output, synchronous with SCLK, MSB first. |
| 핀 7 | SCLK — Serial clock input, up to ~20 MHz. |
| 핀 8 | /CS — Chip select, active low; enables serial frame. |
일반적인 애플리케이션
ADS7835EB/2K5G4 적합 용도: 7 애플리케이션s: Portable Multi-Channel Data Loggers, Wireless Communication Device Battery Monitoring, Optical Module Power Monitoring, Spectrum Analyzer IF Digitization, Industrial Process Control Sensor Digitization, Medical Patient Monitoring Wearables, Smart Sensor Hubs and IoT Edge Nodes.
Portable Multi-Channel Data Loggers
The ADS7835EB/2K5G4's 17.5 mW active dissipation and 2.5 mW power-down mode make it ideal for handheld multi-channel data loggers where battery life is paramount. Placed after a low-noise front-end MUX and instrumentation amplifier, the ADC delivers 500 kSPS to a small host MCU over a synchronous serial SPI bus. Compared to discrete ADC + external reference designs, the integrated 2.5 V reference removes a bill-of-material line and ~30 mm² of PCB area - critical in pocket-sized instruments. The 8-pin MSOP footprint also allows four ADCs to be placed within 100 mm² for a synchronized 4-channel logger.
추천
Wireless Communication Device Battery Monitoring
The ADS7835EB/2K5G4 is well suited to wireless handset and IoT-module battery-monitoring subsystems where accurate current and voltage telemetry extends runtime through smarter power management. The internal 2.5 V reference scales voltage dividers cleanly to the input range, the 500 kSPS throughput samples each cell within 2 µs to track load transients, and the SPI-compatible interface connects directly to the host modem or power-management IC. At 2.5 mW shutdown dissipation, the ADC can be duty-cycled to <1% duty and add negligible quiescent load to the battery pack.
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Optical Module Power Monitoring
In SFP+/QSFP optical transceivers, the ADS7835EB/2K5G4 monitors transmit-power and receive-power photodiode currents with 12-bit resolution at 500 kSPS, providing the host ASIC with a real-time DOM (digital optical monitoring) telemetry stream. The internal reference eliminates a noisy external reference in the tight SFP+ module envelope, and the 8-pin MSOP occupies less than 15 mm². The synchronous serial interface allows the part to share an SPI bus with the module's temperature and supply monitors, reducing MCU pin count to 3 total.
추천
Spectrum Analyzer IF Digitization
The ADS7835EB/2K5G4's 500 kSPS throughput and bipolar -VREF to +VREF input range are well matched to digitize the intermediate-frequency (IF) stage of a low-cost spectrum analyzer, capturing audio-bandwidth signals from 0 Hz to ~200 kHz. The integrated 2.5 V reference and 8-pin MSOP footprint allow the ADC to be placed directly adjacent to the mixer, keeping analog trace lengths short. Compared to discrete ADCs that require external references, the ADS7835 reduces part count by 1 and board area by ~25%, easing the tight cost targets of entry-level bench instruments.
추천
Industrial Process Control Sensor Digitization
In 4-20 mA loop-powered transmitters and industrial PLC analog-input modules, the ADS7835EB/2K5G4 digitizes bridge sensors, thermocouples, and 0-10 V process signals with 12-bit resolution and 500 kSPS throughput. The synchronous serial port provides natural galvanic isolation through a digital isolator, satisfying IEC 61000-4 surge requirements for factory-floor installation. The -40 C to +85 C industrial temperature range and integrated reference ensure stable, calibrated readings across the operating envelope, eliminating per-board calibration routines that would otherwise raise manufacturing cost.
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Medical Patient Monitoring Wearables
The ADS7835EB/2K5G4's 17.5 mW active and 2.5 mW shutdown power budget make it well suited to battery-powered wearable patient monitors that measure ECG, SpO2 photoplethysmography, and respiration impedance. The internal 2.5 V reference scales the analog front-end signal directly, and the synchronous SPI port streams 12-bit data at 500 samples per second - enough to capture ECG bandwidths up to 250 Hz per Nyquist. The 8-pin MSOP package fits inside a wrist-watch-class form factor, and the -40 C to +85 C range covers clinical and home-use environments.
추천
Smart Sensor Hubs and IoT Edge Nodes
In IoT edge sensor hubs that aggregate temperature, pressure, and humidity signals, the ADS7835EB/2K5G4 provides 12-bit 500 kSPS conversion of up to 8 multiplexed analog channels with deterministic latency. The synchronous serial interface pairs naturally with a low-power Cortex-M0 host MCU, and the integrated 2.5 V reference allows the hub to operate from a single 5 V rail without a separate reference IC. The 2.5 mW power-down mode supports 1%-duty-cycle wake-and-sample operation, achieving multi-year battery life on a 2xAA cell for indoor IoT deployments.
추천
추천 제품 요약
엔지니어링 참조 데이터: ADS7835EB/2K5G4 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | ADS7835EB/2K5 | ADS7835E/2K5G4 | ADS7835E/250G4 | ADS7822EB/250G4 | ADS7822PG4 | ADS7825PG4 |
|---|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | MSOP-8 (VSSOP-8) with exposed pad | MSOP-8 (VSSOP-8) with exposed pad - same | MSOP-8 (VSSOP-8) without exposed pad | MSOP-8 (VSSOP-8) without exposed pad | MSOP-8 (VSSOP-8) with exposed pad - same | MSOP-8 (VSSOP-8) without exposed pad | MSOP-8 (VSSOP-8) without exposed pad |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 16 bits |
| Sample Rate | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 200 kSPS | 200 kSPS | 200 kSPS |
| Internal Reference | 2.5 V (internal) | 2.5 V (internal) | 2.5 V (internal) | 2.5 V (internal) | 2.5 V (internal) | 2.5 V (internal) | 2.5 V (internal) |
| Active Power Dissipation | 17.5 mW | 17.5 mW | 17.5 mW | 17.5 mW | ~10 mW | ~10 mW | ~25 mW |
| Power-Down Dissipation | 2.5 mW | 2.5 mW | 2.5 mW | 2.5 mW | 1.5 mW | 1.5 mW | 3.0 mW |
| Supply Voltage | +5 V single supply | +5 V single supply | +5 V single supply | +5 V single supply | +5 V single supply | +5 V single supply | +5 V single supply |
| Operating Temperature Range | -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 | -40 C to +85 C | -40 C to +85 C |
주요 차별점
- Integrated 2.5 V reference eliminates a discrete reference IC and ~30 mm² of PCB area (vs ADS8665 (16-bit 1 MSPS SAR ADC))
- Tiny 8-pin MSOP footprint fits within 15 mm² of PCB area (vs ADS7822EB/250G4 (12-bit 200 kSPS SAR ADC))
- 17.5 mW active / 2.5 mW shutdown power budget supports multi-year battery life (vs ADS7825PG4 (16-bit 200 kSPS SAR ADC))
- Bipolar -VREF to +VREF input range supports industrial process signals directly (vs ADS7813PG4 (12-bit 40 kSPS SAR ADC))
설계 노트
Place a 0.1 µF ceramic bypass capacitor within 2 mm of the +VD pin (pin 1) and a 10 µF tantalum bulk capacitor on the analog supply. Per the TI ADS7835 datasheet, the REF pin (pin 4) should be bypassed with a 1 µF ceramic capacitor placed within 5 mm of the pin to filter the internal reference noise. The exposed thermal pad on the bottom of the MSOP package must be soldered to the analog ground plane to minimize reference-voltage drift and provide thermal dissipation.
Keep the analog input trace (pin 2) as short as possible and route it away from the digital SCLK (pin 7) and DOUT (pin 6) traces. Per the TI ADS7835 layout guidelines, the analog and digital grounds should be joined at a single star point beneath the exposed pad of the ADC. If the host MCU is more than 50 mm away, place a 100 Ω series resistor on the SCLK line near the ADC to dampen reflections and prevent digital-coupling noise from corrupting conversions.
The ADS7835 requires a minimum 100 ns acquisition time (tACQ) to settle to 12-bit accuracy at full throughput. Per the TI datasheet, the SCLK frequency must be chosen so that the total conversion + acquisition period stays at or below 2 µs (500 kSPS). Driving the SCLK line from a low-impedance CMOS buffer and avoiding long, parallel traces to noisy digital signals preserves the 12-bit no-missing-code performance specified in the datasheet. Estimated: 12 bits of 5 V full-scale imply ~1.22 mV LSB, so any noise above 0.6 mV RMS on the analog input will degrade linearity.
The ADS7835EB/2K5G4 draws 17.5 mW at 500 kSPS and 2.5 mW in power-down mode, making it well suited to battery-powered applications. Per the TI ADS7835 datasheet, driving the /CS pin high for at least 100 ns triggers the power-down state, and bringing /CS low re-initializes the next conversion. For duty-cycled applications, keep the duty cycle above 1% (5 µs active per 500 µs period) to avoid waking the internal reference and adding ~50 ms warm-up time per sample.
Do not exceed the +VD supply voltage of +5.5 V absolute maximum, and ensure that the analog input voltage at pin 2 stays within -VREF to +VREF (0 V to +5 V when VREF=2.5 V). Per the TI datasheet, the digital I/O (DOUT, SCLK, /CS) is referenced to -VD, which should be tied to GND for single-supply operation. Failing to bypass the REF pin with a 1 µF capacitor is the most common cause of degraded SNR in customer designs.
규정 준수 정보
Pb-free finish indicated by 'G4' suffix in the MPN. Per the TI product page, the part is RoHS and REACH compliant; it is not AEC-Q100 qualified - the ADS7835EQDGKREP is the automotive-grade equivalent in the same family. Halogen-free status confirmed per the TI material declaration.
