ADS7835EQDGKREP - 12-Bit 500kHz Low-Power ADC | Texas Instruments
N.º da peça: ADS7835EQDGKREP ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $14.5 | $14,50 |
| 10 | $13.05 | $130,50 |
| 100 | $11.62 | $1.162,00 |
| 500 | $10.4 | $5.200,00 |
| 1.000 | $9.25 | $9.250,00 |
ADS7835EQDGKREP Visão geral
A SAR ADC is a successive-approximation-register analog-to-digital converter - a sub-category of data converters that uses a binary search algorithm and an internal precision DAC to digitize an analog input one bit at a time per clock cycle. SAR ADCs sit within the broader hierarchy of data converters (ADC/DAC) -> signal chain -> analog front-end -> mixed-signal IC. They are valued for zero-latency single-shot conversions, deterministic behavior, and excellent DC accuracy, making them preferred over delta-sigma ADCs when instantaneous sampling and fast response to input transients are required.
Key features of the ADS7835EQDGKREP include a 500 kSPS maximum throughput rate, 17.5 mW typical power dissipation, a 2.5 V internal reference with low drift, a pseudo-differential analog input structure that accepts 0 V to VREF input signals, an SPI/QSPI/MICROWIRE-compatible serial data interface, and hardware-configurable unipolar input range. The internal reference eliminates the need for an external reference IC, reducing BOM count and PCB area. The serial interface minimizes I/O pin count, simplifying routing on dense mixed-signal boards.
Architecturally, the converter uses a charge-redistribution DAC array controlled by a successive-approximation engine. The input is acquired on an internal sample-and-hold capacitor, then compared bit-by-bit against the reference. The 2.5 V reference is generated by a low-noise bandgap cell; its accuracy directly sets the converter's absolute gain error. The 8-pin MSOP/TSSOP package gives the part a footprint of roughly 3.00 mm x 3.00 mm, ideal for space-constrained applications.
Typical applications include industrial process control loop monitoring, portable or battery-powered instrumentation, optical-module monitoring (laser bias current/voltage), high-speed closed-loop servo systems, and general-purpose data acquisition front-ends where 12-bit resolution and 500 kSPS throughput are sufficient. The single-channel architecture with serial output also makes the part a natural fit for multiplexed or multi-channel systems where an external MUX is acceptable.
When designing with this device, ensure that the analog input does not exceed the supply rail minus the headroom required by the input ESD structures, and place the supply decoupling capacitor (typically 0.1 uF ceramic in parallel with 10 uF bulk) within a few millimeters of the AVDD pin. The serial clock (DCLK) should be kept low when CS is deasserted to prevent spurious conversions.
This page consolidates distributor pricing, drop-in alternatives sourced from the TI ADS78xx family, and practical design notes that go beyond the manufacturer datasheet to accelerate schematic capture and BOM selection.
Alternativas drop-in para ADS7835EQDGKREP — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ADS7835EQDGKREP (mesmo formato e footprint) — diferindo em Input Voltage Range, Number of Input Channels, Package, Resolution, Acquisition + Conversion Time.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ADS7835IDGKR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ADS7835IPWR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ADS7834EP
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ADS7825UE4
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$17.2 / unidade
Ver ficha técnica →ADS7824UB/1KG4
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$9.4 / unidade
Ver ficha técnica →ADS7835EQDGKREP Classificações máximas e características elétricas
| Resolução | 12 bits |
| Sampling Rate (Throughput) | 500 kSPS |
| Number of Input Channels | 1 (single-ended / pseudo-differential) |
| Architecture | SAR (Successive Approximation) |
| Data Interface | Serial (SPI / QSPI / MICROWIRE compatible) |
| Internal Reference Voltage | 2.5 V |
| Analog Supply Voltage (AVDD) | 5 V (4.75 V to 5.25 V) |
| Power Dissipation (typ @ 500 kSPS) | 17.5 mW |
| Faixa de tensão de entrada | 0 V to VREF (unipolar) |
| Operating Temperature Range (EP) | -40 C to +125 C |
| Encapsulamento | 8-MSOP / 8-TSSOP (DGK), 3.00 mm width |
| Tipo de montagem | Surface Mount |
| Nível MSL | 2 (per JEDEC J-STD-020) |
| Status RoHS | Compliant |
| Lead Finish | NiPdAu (lead-free) |
| Screening Level | EP (Enhanced Product - industrial / harsh env) |
| AEC-Q100 | Not qualified (EP flow, not automotive Q100) |
Configuração de pinos do ADS7835EQDGKREP
| Pino 1 | CS — Chip-select; active low, frames each conversion cycle |
| Pino 2 | AVDD — Analog supply (5 V nominal); decouple with 0.1 uF + 10 uF |
| Pino 3 | REF — Reference voltage; internal 2.5 V or external drive |
| Pino 4 | AGND — Analog ground return |
| Pino 5 | DCLK — Serial data clock from host controller |
| Pino 6 | SDOUT — Serial data output, MSB-first |
| Pino 7 | IN — Analog input (0 V to VREF, pseudo-differential) |
| Pino 8 | RANGE — Input range select; logic high selects unipolar input range |
Aplicações típicas
ADS7835EQDGKREP é adequado para 6 aplicaçãos: Industrial Process Control Loop Monitoring, Optical Module / Laser Bias Monitoring, Portable Battery-Powered Instrumentation, High-Speed Closed-Loop Servo Systems, General Data Acquisition Front-End, Power Supply Telemetry and Supervision.
Industrial Process Control Loop Monitoring
The ADS7835EQDGKREP is well-suited for industrial process control loops that require 12-bit accuracy and sub-microsecond settling to digitize 4-20 mA conditioned signals from pressure, flow, or temperature transmitters. Its 500 kSPS throughput allows oversampling multiple process variables while the integrated 2.5 V reference removes the external reference drift budget. The EP enhanced-product screening ensures the part survives the elevated ambient temperatures and vibration seen in cabinet-mounted PLCs and DCS chassis. A practical design places the ADC downstream of a sensor-conditioning op-amp with the AVDD supply heavily decoupled to suppress motor-drive noise on the factory floor.
Recomendado
Optical Module / Laser Bias Monitoring
Photonic transceivers and pump-laser modules require tightly regulated bias currents, and the ADS7835EQDGKREP's 500 kSPS rate lets the host controller digitize the average laser current many times per bias-control loop iteration. With 12-bit resolution on a 2.5 V full-scale range, the ADC resolves roughly 0.61 mV per LSB, which is sufficient to detect sub-mA drift in a transimpedance-amplifier loop. The serial SPI/QSPI/MICROWIRE interface maps cleanly onto the small microcontroller or FPGA commonly used as the optical-module controller, and the MSOP-8 footprint fits easily inside QSFP or SFP+ module cavities.
Recomendado
Portable Battery-Powered Instrumentation
Handheld multimeters, field data loggers, and portable gas analyzers benefit from the ADS7835EQDGKREP's low 17.5 mW power budget at full speed and its ability to scale down throughput (and power) by reducing the DCLK rate at lower sampling needs. The internal 2.5 V reference eliminates the external reference quiescent current that would otherwise drain a battery, while the EP screening provides the ruggedness required for field-deployed equipment. Designers should duty-cycle the ADC and put it into full power-down between conversions to extend battery life into the multi-month range.
Recomendado
High-Speed Closed-Loop Servo Systems
Servo drives, motion controllers, and CNC axis amplifiers need deterministic, zero-latency conversions to close current, velocity, or position loops - exactly the behavior of a SAR ADC like the ADS7835EQDGKREP. With 500 kSPS and a single conversion latency of 16 clocks, the controller can sample the current shunt amplifier, run its PID loop, and update the PWM duty cycle within microseconds, achieving kHz-class control bandwidths. The 8-pin MSOP package keeps the ADC footprint minimal on dense power-stage PCBs, and the EP screening supports the elevated temperatures inside the servo drive enclosure.
Recomendado
General Data Acquisition Front-End
For general-purpose data acquisition boards, the ADS7835EQDGKREP provides a clean, single-channel, 500 kSPS analog front-end that an external multiplexer can extend to 4, 8, or 16 channels. The integrated 2.5 V reference simplifies the analog supply chain, and the serial output drops directly into an FPGA or microcontroller DMA engine without consuming parallel I/O pins. Combined with the EP screening, the part is at home in test-and-measurement chassis, automated test equipment (ATE) pin-cards, and modular instrumentation platforms.
Recomendado
Power Supply Telemetry and Supervision
Power supply modules, PoE injectors, and battery-management boards use the ADS7835EQDGKREP to digitize output voltage, output current, and temperature for housekeeping telemetry. The 500 kSPS rate is overkill for slow telemetry but provides margin for catching fast transients during load-step events, while the internal 2.5 V reference is accurate enough for 1-2% voltage reporting. The serial interface uses only three microcontroller pins, leaving more I/O available for I2C, UART, or PMBus communication to the system controller.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ADS7835EQDGKREP — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ADS7835IDGKR | ADS7835IPWR | ADS7834EP | ADS7825UE4 | ADS7824UB/1KG4 |
|---|---|---|---|---|---|---|
| Package | 8-MSOP / 8-TSSOP (DGK) | 8-MSOP (DGK) - same | 8-TSSOP (PW) - same body width | 8-MSOP (DGK) - same | 8-MSOP (DGK) - same | 8-MSOP (DGK) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Throughput (max) | 500 kSPS | 500 kSPS | 500 kSPS | 200 kSPS (-60%) | 200 kSPS (-60%) | 40 kSPS (-92%) |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V | 2.5 V |
| Number of Input Channels | 1 (pseudo-differential) | 1 | 1 | 1 | 4 (multi-channel) | 4 (multi-channel) |
| Interface | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE | Serial SPI/QSPI/MICROWIRE |
| EP Screening (Enhanced Product) | Yes (-40 C to +125 C) | No (commercial) | No (industrial) | Yes | No | No |
Principais diferenciais
- EP enhanced-product screening at industrial temp range (vs ADS7835IPWR)
- Highest throughput in the ADS78xx 8-pin MSOP family (vs ADS7825UE4)
- Single-channel SAR with internal reference reduces BOM (vs ADS7825UE4)
Notas de projeto
Estimated: at 500 kSPS the ADS7835EQDGKREP consumes 17.5 mW from a 5 V AVDD, equating to ~3.5 mA of supply current. Decouple AVDD with a 0.1 uF X7R ceramic placed within 1-2 mm of the AVDD pin and a 10 uF X5R bulk capacitor to suppress switching noise from the host microcontroller. If the application uses a shared 5 V rail with motors or relays, add a ferrite bead (e.g., BLM18PG221SN1) between the rail and the ADC's AVDD pin to filter conducted noise.
Keep the analog input trace short and guarded by a ground pour on both sides. The 8-pin MSOP DGK package has its analog input (pin 7) adjacent to the digital DCLK pin (pin 5); route DCLK on the opposite side of the board from the analog input or shield it with a ground trace to prevent digital-to-analog crosstalk that can degrade SNR by 1-2 LSB. The reference pin (pin 3) should be bypassed with a 10 nF ceramic placed directly at the pin.
Do not let the analog input exceed AVDD + 0.3 V; the ADC's input ESD structures will forward-bias and corrupt the conversion. Also ensure that DCLK is held low when CS is deasserted (idle state), otherwise spurious conversions can occur. The internal 2.5 V reference requires at least 0.1 uF of bypass capacitance at the REF pin to remain stable; omitting this capacitor can add 5-10 LSB of gain error.
Informações de conformidade
EP (Enhanced Product) flow adds industrial-grade reliability screening; not AEC-Q100 qualified for automotive. RoHS compliant per TI product page. Lead-free NiPdAu finish per TI datasheet.
