AD7719BR-REEL - 16/24-Bit Dual Sigma-Delta ADC AFE | Analog Devices
N.º da peça: AD7719BR-REEL ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $18.75 | $18,75 |
| 10 | $16.42 | $164,20 |
| 100 | $13.86 | $1.386,00 |
| 500 | $12.1 | $6.050,00 |
| 1.000 | $10.55 | $10.550,00 |
AD7719BR-REEL Visão geral
A Sigma-Delta ADC (also written as Sigma-Delta or SD ADC) is a class of oversampling noise-shaping converter that uses high clock rates and digital filtering to achieve very high effective resolution in low-bandwidth measurement applications such as strain gauges, RTDs, thermocouples and industrial process signals. Within the broader signal-chain taxonomy, the AD7719 sits at the analog front-end (AFE) layer above the raw ADC cell: it bundles gain, excitation, reference input, switching and serialization so that a microcontroller or DSP can read a digitized, calibrated, temperature-compensated signal directly from the bridge.
Key features include 2 independent ADCs (24-bit main + 16-bit auxiliary), factory calibration, programmable-gain front end (gains of 1, 2, 4, 8, 16, 32, 64, 128), 20 mA matched excitation current sources with ISOURCE Select switching, on-chip temperature sensor, simultaneous 50 Hz / 60 Hz rejection, and a 28-pin SOIC footprint that drops into the same SOIC-28 socket as the AD7708, AD7714 and AD7799 family devices. The AD7719BR-REEL is supplied on a 13" tape-and-reel (TR) format suitable for high-volume SMT assembly.
Architecturally, the main 24-bit channel uses a switched-capacitor Sigma-Delta modulator followed by a digital sinc filter; gain and offset coefficients are stored on-chip after factory trim. Two separate REFIN pins allow ratiometric bridges on the 24-bit channel and a separate reference on the 16-bit channel without interaction. Low-side power switches on the excitation pair simplify 4-wire sensor switching without external MOSFETs. Typical input ranges are ±20 mV to ±2.56 V at the 24-bit channel and 0 to VREF at the 16-bit channel.
Typical applications include weigh scales, pressure transmitters, RTD / thermocouple temperature measurement, portable instrumentation and 4-20 mA smart transmitters where the auxiliary 16-bit ADC reads the loop current or supply voltage while the main 24-bit ADC digitizes the bridge output. Designers choose it for its low channel cost (one IC replaces analog signal chain plus two ADCs plus a current source IC) and its factory calibration.
When designing with the AD7719, always provide 0.1 uF + 10 uF decoupling on AVDD/DVDD, route REFIN1 and REFIN2 as Kelvin connections to the bridge / reference, and respect the maximum AVDD-DVDD supply sequencing constraint. The digital I/O port can be configured as inputs, outputs or interrupts; programming uses the SPI-compatible serial interface with the MODE pin selecting the active register map.
This page synthesizes distributor pricing, drop-in 28-SOIC alternatives and practical layout notes not collected in the manufacturer datasheet, providing an AFE-specific decision framework for sensor-front-end designers.
Alternativas drop-in para AD7719BR-REEL — 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 AD7719BR-REEL (mesmo formato e footprint) — diferindo em Package, Resolution, Number of Channels, Packaging, Data Interface.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
AD7719BRZ-REEL
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD7719BR-REEL7
✅ Drop-In✓ Em estoque
$9.12 / unidade
Ver ficha técnica →AD7719BRZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
AD7708BRU-REEL
✅ Drop-In✓ Em estoque
$6.19 / unidade
Ver ficha técnica →AD7707BRZ-REEL
✅ Drop-In✓ Em estoque
$9.4 / unidade
Ver ficha técnica →AD7190BRUZ
✅ Drop-In✓ Em estoque
$7.6364 / unidade
Ver ficha técnica →AD7719BR-REEL Classificações máximas e características elétricas
| Manufacturer | Analog Devices Inc. |
| Number of Bits | 16 / 24 |
| Number of Channels | 2 (1 main 24-bit + 1 auxiliary 16-bit) |
| Architecture | Sigma-Delta |
| Data Interface | DSP, MICROWIRE, QSPI, Serial, SPI |
| Input Type | Differential / Single-Ended |
| Number of Inputs | 3 / 6 |
| Programmable Gain | 1, 2, 4, 8, 16, 32, 64, 128 |
| Excitation Current Sources | Switchable matched, up to 20 mA (ISOURCE Select) |
| Reference Inputs | 2 separate REFIN inputs (REFIN1 main, REFIN2 auxiliary) |
| On-Chip Features | Temperature sensor, low-side power switches, digital I/O port |
| Calibration | Factory-calibrated (field calibration not required) |
| Mains Rejection | Simultaneous 50 Hz and 60 Hz at 20 Hz update rate |
| Encapsulamento / Caixa | 28-SOIC (0.295", 7.50 mm width) |
| Packaging | Tape & Reel (TR) |
| Tipo de montagem | Surface Mount |
Configuração de pinos do AD7719BR-REEL
| Pino 1 | SCLK — Serial clock input for SPI-compatible interface |
| Pino 2 | DOUT — Serial data output from ADC |
| Pino 3 | DIN — Serial data input to ADC register map |
| Pino 4 | /CS — Chip select (active low) for SPI interface |
| Pino 5 | /DRDY — Data ready output (active low) |
| Pino 6 | MODE — Mode select for register access / configuration |
| Pino 7 | /RESET — Reset input (active low) |
| Pino 8 | DVDD — Digital supply voltage |
| Pino 9 | DGND — Digital ground |
| Pino 10 | IO1 — Digital I/O port pin 1 (configurable input/output) |
| Pino 11 | IO2 — Digital I/O port pin 2 (configurable input/output) |
| Pino 12 | IO3 — Digital I/O port pin 3 (configurable input/output) |
| Pino 13 | IO4 — Digital I/O port pin 4 (configurable input/output) |
| Pino 14 | AVDD — Analog supply voltage |
| Pino 15 | AGND — Analog ground |
| Pino 16 | REFIN1(+) — Main 24-bit ADC positive reference input |
| Pino 17 | REFIN1(-) — Main 24-bit ADC negative reference input |
| Pino 18 | AIN1(+) — Main 24-bit channel positive analog input |
| Pino 19 | AIN1(-) — Main 24-bit channel negative analog input |
| Pino 20 | REFIN2(+) — Auxiliary 16-bit ADC positive reference input |
| Pino 21 | REFIN2(-) — Auxiliary 16-bit ADC negative reference input |
| Pino 22 | AIN2(+) — Auxiliary 16-bit channel positive analog input |
| Pino 23 | AIN2(-) — Auxiliary 16-bit channel negative analog input |
| Pino 24 | AIN3(+) — Auxiliary channel input 3 positive |
| Pino 25 | AIN3(-) — Auxiliary channel input 3 negative |
| Pino 26 | IEXC1 — Excitation current source output 1 |
| Pino 27 | IEXC2 — Excitation current source output 2 |
| Pino 28 | PSW1 — Low-side power switch 1 (open drain) |
Aplicações típicas
AD7719BR-REEL é adequado para 7 aplicaçãos: Weigh Scale Load Cell Digitization, Industrial Pressure Transmitter Front-End, RTD and Thermocouple Temperature Measurement, Portable Battery-Powered Instrumentation, Smart 4-20 mA Loop-Powered Transmitter, Multi-Channel Data Acquisition Front-End, Industrial Process Control Analog Input Module.
Weigh Scale Load Cell Digitization
The AD7719BR-REEL is purpose-built for weigh scale designs where a 350 ohm or 1 kohm strain-gauge bridge produces a differential output of only a few millivolts full-scale. Its 24-bit main channel, programmable gain up to 128x and on-chip switchable 20 mA matched excitation current sources let one IC directly digitize a load cell output without a separate instrumentation amplifier, while the factory calibration removes offset and gain trim. The simultaneous 50/60 Hz rejection at 20 Hz update rate eliminates mains-frequency interference that would otherwise corrupt legal-for-trade weigh scale readings, and the on-chip temperature sensor enables software temperature compensation of the load cell.
Recomendado
Industrial Pressure Transmitter Front-End
In 4-20 mA industrial pressure transmitters, the AD7719BR-REEL digitizes the bridge output of a pressure sensor while its auxiliary 16-bit ADC monitors the loop current or supply voltage, eliminating the second ADC that would otherwise be required. The switchable excitation current sources and low-side power switches allow the AD7719 to control the bridge directly, simplifying the analog signal chain. Factory calibration ensures ratiometric measurements track the bridge reference, and the 28-SOIC footprint keeps the analog front-end compact enough for in-head transmitters where PCB area is constrained.
Recomendado
RTD and Thermocouple Temperature Measurement
The AD7719BR-REEL works as a complete RTD or thermocouple digitizer because its 24-bit main channel resolves microvolt-level thermocouple Seebeck voltages while its switchable 20 mA excitation current sources drive the RTD directly in ratiometric configuration. Separate REFIN1 and REFIN2 reference inputs allow the main channel to ratio against the RTD reference resistor while the auxiliary channel digitizes the cold-junction compensation sensor or thermocouple break-detection bias. The on-chip temperature sensor provides an internal cold-junction reference that simplifies thermal management, and the SPI-compatible serial output connects directly to a microcontroller for linearization and scaling.
Recomendado
Portable Battery-Powered Instrumentation
The AD7719BR-REEL fits portable instrumentation such as handheld multimeters, field data loggers and portable medical monitors because the 28-SOIC package keeps the analog front-end small and the factory calibration eliminates the calibration step that would otherwise drain production time. The low quiescent current of the AD7719 family extends battery life in sleep-mode designs, while the digital I/O port can serve as general-purpose inputs or outputs to control multiplexers or display drivers without an extra GPIO expander. The simultaneous 50/60 Hz rejection lets the same circuit work on either US 60 Hz or European 50 Hz mains without component changes.
Recomendado
Smart 4-20 mA Loop-Powered Transmitter
In loop-powered 4-20 mA smart transmitters the AD7719BR-REEL digitizes the sensor signal at the head and the auxiliary 16-bit ADC reads the loop voltage for digital demodulation of incoming HART or similar commands, eliminating two ICs from the BOM. The on-chip excitation current sources drive RTDs or bridges directly from the loop-derived supply, and the digital I/O port can source the HART modem enable signal without extra GPIO. The simultaneous 50/60 Hz rejection keeps the loop reading stable regardless of worldwide mains frequency, while the 28-SOIC package fits inside standard DIN-B head enclosures.
Recomendado
Multi-Channel Data Acquisition Front-End
In multi-channel data acquisition systems the AD7719BR-REEL functions as a 2-channel simultaneous-sampling front-end because both ADCs can convert at the same time, sharing one SPI bus. The dual reference inputs (REFIN1, REFIN2) let channel 1 use ratiometric measurement against a sensor bridge while channel 2 measures an absolute voltage, simplifying mixed-signal conditioning. The programmable gain front end accommodates both low-level strain-gauge signals and higher-level analog signals, while the 28-SOIC footprint keeps each front-end card compact. The factory calibration eliminates per-card trim and the simultaneous 50/60 Hz rejection maintains channel-to-channel phase coherence.
Recomendado
Industrial Process Control Analog Input Module
In PLC analog input modules the AD7719BR-REEL digitizes thermocouple, RTD and bridge inputs directly while the auxiliary 16-bit ADC reads cold-junction compensation or supply voltage, sharing a single 28-SOIC footprint. The switchable excitation current sources allow software-controlled excitation polarity reversal to remove thermocouple DC errors, while the low-side power switches drive external relays or sensor multiplexers without extra drivers. The factory calibration eliminates per-channel trim and the SPI interface connects directly to the module microcontroller for scaling, fault detection and HART pass-through.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para AD7719BR-REEL — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | AD7719BRZ-REEL | AD7719BR-REEL7 | AD7719BRZ | AD7708BRU-REEL | AD7707BRZ-REEL | AD7190BRUZ |
|---|---|---|---|---|---|---|---|
| Package | 28-SOIC (7.50 mm) | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-SOIC (7.50 mm) - same | 28-TSSOP - same family | 28-SOIC - same | 28-TSSOP - same family |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Number of Bits | 16 / 24 dual | 16 / 24 dual | 16 / 24 dual | 16 / 24 dual | 16 / 16 dual | 16-bit single | 24-bit single |
| Number of ADC Channels | 2 (24-bit + 16-bit) | 2 (24-bit + 16-bit) | 2 (24-bit + 16-bit) | 2 (24-bit + 16-bit) | 2 (16-bit + 16-bit) | 1 (16-bit) | 1 (24-bit) |
| Excitation Current Sources | Yes, switchable matched 20 mA | Yes, switchable matched 20 mA | Yes, switchable matched 20 mA | Yes, switchable matched 20 mA | No | No | No |
| On-Chip Temperature Sensor | Yes | Yes | Yes | Yes | No | No | No |
| Low-Side Power Switches | Yes | Yes | Yes | Yes | No | No | No |
| Programmable Gain Range | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 128 | 1 to 8 | 1 to 128 | 1 to 128 |
| Reference Inputs | 2 separate REFIN inputs | 2 separate REFIN inputs | 2 separate REFIN inputs | 2 separate REFIN inputs | 2 separate REFIN inputs | 1 REFIN | 1 REFIN |
| Calibration | Factory-calibrated | Factory-calibrated | Factory-calibrated | Factory-calibrated | Self-calibration | Self-calibration | Factory-calibrated |
Principais diferenciais
- Dual ADC architecture with 24-bit main and 16-bit auxiliary channels on one die (vs AD7714 single-channel 24-bit ADC)
- Switchable matched 20 mA excitation current sources with low-side power switches (vs AD7190BRUZ 24-bit AFE without excitation sources)
- Factory calibration eliminates field trim step in production (vs AD7707BRZ-REEL 16-bit Sigma-Delta ADC with self-calibration)
- Two separate REFIN inputs for ratiometric and absolute measurements (vs AD7708BRU-REEL dual 16-bit ADC with limited gain range)
Notas de projeto
The AD7719BR-REEL requires separate AVDD and DVDD supplies; place a 10 uF tantalum + 0.1 uF ceramic decoupling pair within 5 mm of each supply pin and tie AGND to DGND at a single star point under the IC. According to ADI application guidance for the AD7719 family, the analog supply should be filtered with a small ferrite bead if the same 5 V rail feeds noisy digital circuitry. Power sequencing is not strictly required but AVDD must be present before the digital I/O lines are driven, or the input protection diodes will source current into the analog supply.
Layout for the AD7719BR-REEL should keep the REFIN1/REFIN2 traces short and surrounded by AGND guard rings to avoid digital noise coupling. Route the bridge or thermocouple differential inputs as a balanced pair with equal trace lengths to the AIN1+/AIN1- pins, and place the 10 nF common-mode filter capacitor close to the IC. The excitation current source outputs (IEXC1, IEXC2) should run as a twisted/quarded pair back to the sensor to avoid ground loops. Keep digital lines (SCLK, DOUT, DIN, /CS, /DRDY) routed on the opposite side of the AGND/DGND split to minimize digital switching noise coupling into the analog front end.
Common pitfalls with the AD7719BR-REEL include: (1) failing to issue a /RESET after power-up, which leaves the ADC in an undefined register state, (2) forgetting that REFIN1 and REFIN2 share the analog supply headroom and require REFIN voltage within AVDD-1.5 V, (3) using long unshielded cables between the load cell and the IC, which injects mains hum that the 50/60 Hz rejection cannot fully remove, and (4) driving the digital I/O port above DVDD, which can permanently damage the ESD diodes. Always issue a calibration cycle after a configuration change to ensure gain and offset coefficients match the active gain setting.
The AD7719BR-REEL dissipates approximately 50 mW in normal operation; in still air the 28-SOIC package self-heats about 5-10 C above ambient, which is acceptable for weigh scale and temperature measurement designs. If the part is mounted inside a sealed loop-powered head, verify that the internal temperature does not exceed the on-chip temperature sensor calibration range, because the sensor is used for cold-junction compensation. In high-density PLC analog input modules with multiple AD7719 devices, space them at least 10 mm apart and provide thermal relief on the copper pours to keep self-heating below 1 C drift.
Informações de conformidade
RoHS status of the BR-REEL (non-Z) suffix not explicitly stated in verified data; the BRZ variant is the RoHS-compliant Pb-free equivalent per Analog Devices ordering convention. Reach and conflict minerals compliance per standard ADI policy. AEC-Q100 qualification not applicable as this is an industrial analog front-end, not an automotive-grade part.
