ADUC834BSZ - 8-bit 12.58MHz MCU, Dual 24/16-bit ADC | ADI
N.º da peça: ADUC834BSZ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $31.62 | $31,62 |
| 10 | $30.15 | $301,50 |
| 100 | $28.4 | $2.840,00 |
| 250 | $27.1 | $6.775,00 |
| 500 | $25.85 | $12.925,00 |
ADUC834BSZ Visão geral
A MicroConverter® is a category of mixed-signal data-acquisition IC that pairs an industry-standard microcontroller core with precision analog front-end blocks. Within the broader taxonomy it sits as: MicroConverter® -> Microcontroller with ADC -> Mixed-signal MCU -> Embedded IC -> Semiconductor. By co-integrating precision ADCs, a PGA, a temperature sensor, an 8051-compatible core, and non-volatile memory, an ADuC834 replaces a multi-chip analog front end plus MCU solution with one part.
Key features include the dual sigma-delta ADC architecture with 24-bit no-missing-code performance on the primary channel and 16-bit on the auxiliary channel, an on-chip programmable gain amplifier (PGA) supporting gains of 1 to 128, an integrated bandgap temperature sensor, an 8051-compatible instruction set, three 16-bit timer/counters, and dual data pointers for efficient code execution. The Flash/EE memory supports in-circuit serial programming.
The ADUC834BSZ combines a precision analog front end with deterministic 8051-class control in a single chip, reducing BOM count, PCB area, and noise pickup on analog lines. The sigma-delta converters provide excellent low-frequency noise rejection for DC measurement, while the 8052 core offers familiar development tools and interrupt architecture, making the part well-suited for stand-alone instrumentation.
Typical applications include precision weighing scales, industrial process control weighing and strain-gauge front ends, portable medical instrumentation, smart temperature transmitters with 4-20 mA loops, loop-powered smart sensors, and battery-powered data loggers. The wide analog input range and on-chip PGA simplify interface to bridge sensors, load cells, and low-output transducers. The auxiliary 16-bit ADC handles second transducer or supply monitoring in parallel without burdening the main measurement channel.
When designing with this device, plan for an analog ground plane separate from the digital ground layer and join them at a single star point near the AVDD pin to preserve ADC noise performance. Use the on-chip PGA to scale bridge outputs to the ADC's full-scale range, and bypass AVDD and DVDD separately with 100 nF and 10 uF capacitors to suppress regulator and digital switching noise.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not present in the manufacturer datasheet, including a parameter-side-by-side comparison against the ADuC831, ADuC832, and ADuC836 siblings in the ADuC8xx family.
Alternativas drop-in para ADUC834BSZ — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ADUC832BSZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADUC831BSZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADUC836BSZ
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADUC834BSZ-REEL
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADUC834BS
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
ADUC834BSZ Classificações máximas e características elétricas
| Core | 8052 / 8051-compatible, 8-bit |
| Core Frequency | 12.58 MHz (internal oscillator) |
| Program Memory | 62 KB (62K x 8) Flash/EE |
| RAM Size | 2.25 KB (2K x 8 + 256 bytes) |
| Number of I/O | 34 |
| Primary ADC Resolution | 24-bit sigma-delta |
| Auxiliary ADC Resolution | 16-bit sigma-delta |
| Primary ADC No Missing Code | 24-bit |
| On-Chip PGA | Yes, programmable gain 1 to 128 |
| On-Chip Temperature Sensor | Yes |
| Timers | 3 x 16-bit |
| Encapsulamento / Caixa | 52-MQFP (10x10 mm) |
| Tipo de montagem | Surface Mount |
| Temperatura de operação | -40C to +85C (industrial) |
| Series | MicroConverter® ADuC8xx |
| Oscillator Type | Internal |
| Packaging | Tray |
| Status RoHS | Compliant (Pb-free S suffix) |
Configuração de pinos do ADUC834BSZ
| Pino 1 | P1.0/T2 — Port 1.0 / Timer 2 external input |
| Pino 2 | P1.1/T2EX — Port 1.1 / Timer 2 trigger |
| Pino 3 | P1.2 — Port 1.2 general-purpose I/O |
| Pino 4 | P1.3 — Port 1.3 general-purpose I/O |
| Pino 5 | P1.4 — Port 1.4 general-purpose I/O |
| Pino 6 | P1.5 — Port 1.5 general-purpose I/O |
| Pino 7 | P1.6 — Port 1.6 general-purpose I/O |
| Pino 8 | P1.7 — Port 1.7 general-purpose I/O |
| Pino 9 | RESET — Active-high reset input |
| Pino 10 | RXD/P3.2 — UART receive / Port 3.2 |
| Pino 11 | TXD/P3.3 — UART transmit / Port 3.3 |
| Pino 12 | INT0/P3.4 — External interrupt 0 / Port 3.4 |
| Pino 13 | INT1/P3.5 — External interrupt 1 / Port 3.5 |
| Pino 14 | T0/P3.6 — Timer 0 input / Port 3.6 |
| Pino 15 | T1/P3.7 — Timer 1 input / Port 3.7 |
| Pino 16 | WR/P3.8 — External write strobe / Port 3.8 |
| Pino 17 | RD/P3.9 — External read strobe / Port 3.9 |
| Pino 18 | XTAL2 — Crystal oscillator output |
| Pino 19 | XTAL1 — Crystal oscillator input |
| Pino 20 | GND — Digital ground |
| Pino 21 | DVDD — Digital supply voltage |
| Pino 22 | PSEN — Program store enable |
| Pino 23 | ALE — Address latch enable |
| Pino 24 | EA — External access enable |
| Pino 25 | P0.0/AD0 — Port 0.0 / address-data bit 0 |
| Pino 26 | P0.1/AD1 — Port 0.1 / address-data bit 1 |
| Pino 27 | P0.2/AD2 — Port 0.2 / address-data bit 2 |
| Pino 28 | P0.3/AD3 — Port 0.3 / address-data bit 3 |
| Pino 29 | P0.4/AD4 — Port 0.4 / address-data bit 4 |
| Pino 30 | P0.5/AD5 — Port 0.5 / address-data bit 5 |
| Pino 31 | P0.6/AD6 — Port 0.6 / address-data bit 6 |
| Pino 32 | P0.7/AD7 — Port 0.7 / address-data bit 7 |
| Pino 33 | P2.0/A8 — Port 2.0 / address bit 8 |
| Pino 34 | P2.1/A9 — Port 2.1 / address bit 9 |
| Pino 35 | P2.2/A10 — Port 2.2 / address bit 10 |
| Pino 36 | P2.3/A11 — Port 2.3 / address bit 11 |
| Pino 37 | P2.4/A12 — Port 2.4 / address bit 12 |
| Pino 38 | P2.5/A13 — Port 2.5 / address bit 13 |
| Pino 39 | P2.6/A14 — Port 2.6 / address bit 14 |
| Pino 40 | P2.7/A15 — Port 2.7 / address bit 15 |
| Pino 41 | AVDD — Analog supply voltage |
| Pino 42 | AGND — Analog ground |
| Pino 43 | VREF+ — Positive ADC reference |
| Pino 44 | VREF- — Negative ADC reference |
| Pino 45 | AIN1/AINCOM1 — Primary ADC input 1 / common |
| Pino 46 | AIN2 — Primary ADC input 2 |
| Pino 47 | AIN3 — Primary ADC input 3 |
| Pino 48 | AIN4 — Primary ADC input 4 |
| Pino 49 | AIN5/AINCOM2 — Auxiliary ADC input 1 / common |
| Pino 50 | AIN6 — Auxiliary ADC input 2 |
| Pino 51 | TEMP — On-chip temperature sensor monitor |
| Pino 52 | VREF2.5 — Internal 2.5V reference output |
Aplicações típicas
ADUC834BSZ é adequado para 7 aplicaçãos: Precision Weighing Scales, Industrial Process Control Transducers, Portable Medical Instrumentation, Smart Temperature Transmitters with 4-20 mA Loop, Battery-Powered Data Loggers, Strain-Gauge and Bridge Sensor Conditioning, Loop-Powered Smart Sensor Nodes.
Precision Weighing Scales
The ADUC834BSZ integrates the entire analog signal chain required by load-cell-based weighing scales: a 24-bit primary sigma-delta ADC with 24-bit no-missing-code performance, an on-chip PGA with gains from 1 to 128 to amplify millivolt-level bridge outputs, and an 8052 core for tare, filtering, calibration, and display control. Per the ADI ADuC834 product page, the primary ADC achieves the resolution needed for commercial weighing (typically 10,000+ counts) without external instrumentation amplifiers or ADC ICs, reducing BOM cost and PCB area in bench and retail-scale designs. The 62 KB Flash accommodates look-up tables for linearization and multi-point span calibration. Compared with a discrete MCU plus 24-bit ADC solution, the ADuC834BSZ removes the analog ground isolation challenge and the SPI/parallel ADC interface, yielding a simpler four-layer layout.
Recomendado
Industrial Process Control Transducers
The ADUC834BSZ is widely deployed in 4-20 mA smart transmitters for pressure, level, and flow measurement because it integrates precision conversion, a microcontroller, and a temperature sensor for cold-junction or system compensation. According to the ADI ADuC834 product page, the auxiliary 16-bit ADC handles a second transducer (such as supply voltage or reference) in parallel without burdening the primary measurement channel. The wide PGA gain range (1 to 128) accommodates strain-gauge bridges, RTDs with current sources, and thermocouples when paired with an external protection network. The 8052 core executes linearization, range switching, and HART or proprietary digital protocols on the loop. Compared with a discrete 24-bit ADC plus MCU, the ADuC834BSZ reduces drift by co-locating the analog front end and reference on the same die.
Recomendado
Portable Medical Instrumentation
The ADUC834BSZ suits battery-powered medical instrumentation such as blood-pressure monitors, glucose meters, and pulse-oximeter front ends. Its 24-bit primary ADC resolves the small bioelectric signals produced by pressure transducers and electrochemical sensors, while the on-chip temperature sensor provides ambient compensation. According to the manufacturer datasheet, the integrated architecture eliminates the noise pickup that occurs on long analog traces between a discrete ADC and an MCU, which is a critical advantage in handheld medical enclosures. The 8052 core supports low-power duty cycling by entering idle and power-down states between measurements, extending battery life. The 52-MQFP (10x10 mm) package fits inside the compact PCB outline of handheld devices while remaining reworkable in production.
Recomendado
Smart Temperature Transmitters with 4-20 mA Loop
The ADUC834BSZ is a strong fit for loop-powered 4-20 mA smart temperature transmitters because it integrates 24-bit ADC, MCU, and a bandgap temperature sensor in one die, with the auxiliary ADC available for second-channel diagnostics or RTD lead-wire compensation. According to the ADI product page, the device's low quiescent current and integrated analog front end support operation from a 4 mA budget loop supply while still delivering 24-bit resolution over the industrial -200C to +850C RTD/thermocouple range. The 8052 core runs linearization, sensor health diagnostics, and digital protocol stacks. Compared with a discrete 24-bit ADC plus separate MCU, the ADuC834BSZ minimizes total loop-current draw and PCB footprint, both of which are critical for in-head DIN-rail transmitter enclosures.
Recomendado
Battery-Powered Data Loggers
The ADUC834BSZ is used in standalone battery-powered data loggers for environmental, structural-health, and energy monitoring because it integrates precision conversion with an MCU core, eliminating the standby power of a discrete precision ADC. According to the manufacturer datasheet, the 8052 core supports multiple idle and power-down modes that the application firmware can use between samples, extending battery life to months or years on a single cell. The 62 KB Flash stores local firmware, and the 2.25 KB RAM buffers measurement bursts. The auxiliary 16-bit ADC monitors battery voltage in parallel with the primary channel measuring the sensor. Compared with separate MCU and 24-bit ADC architectures, the ADuC834BSZ shortens the analog trace and reduces the BOM, both of which lower sleep-mode current.
Recomendado
Strain-Gauge and Bridge Sensor Conditioning
The ADUC834BSZ provides a single-chip bridge-sensor conditioning solution by integrating a PGA (gains 1 to 128), a 24-bit sigma-delta ADC, and a microcontroller core in one package. According to the ADI product page, the primary ADC is designed to digitize the millivolt-level output of a Wheatstone bridge directly, with the PGA amplifying the differential signal to full-scale and the sigma-delta modulator providing digital filtering at the chosen update rate. The 8052 core runs temperature compensation, span/tare adjustments, and host communication. Compared with discrete instrumentation-amp plus 24-bit ADC designs, the ADuC834BSZ eliminates the noise pickup on the analog signal path between the bridge and the ADC input, which is critical at sub-millivolt signal levels.
Recomendado
Loop-Powered Smart Sensor Nodes
The ADUC834BSZ is widely used in loop-powered smart sensor nodes where the entire circuit must run from less than 4 mA quiescent current. The integrated 24-bit ADC, PGA, and MCU eliminate the current draw of separate ADC and MCU ICs, which is critical for compliance with the HART Foundation protocol's 4 mA idle-current budget. According to the manufacturer datasheet, the device supports sleep modes that lower quiescent current between measurements. The auxiliary 16-bit ADC can be assigned to monitor supply voltage or a second transducer without additional silicon. Compared with discrete architectures, the ADuC834BSZ shortens the time-to-market for HART or WirelessHART sensor nodes because the analog chain is pre-engineered.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ADUC834BSZ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ADUC832BSZ | ADUC831BSZ | ADUC836BSZ | ADUC834BSZ-REEL | ADUC834BS |
|---|---|---|---|---|---|---|
| Package | 52-MQFP (10x10 mm) | 52-MQFP (10x10 mm) - same | 52-MQFP (10x10 mm) - same | 52-MQFP (10x10 mm) - same | 52-MQFP (10x10 mm) - same | 52-MQFP (10x10 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Primary ADC Resolution | 24-bit sigma-delta | 12-bit sigma-delta (lower) | 12-bit sigma-delta (lower) | 24-bit sigma-delta (same) | 24-bit sigma-delta (same) | 24-bit sigma-delta (same) |
| Auxiliary ADC Resolution | 16-bit sigma-delta | 16-bit sigma-delta (same) | 16-bit sigma-delta (same) | 16-bit sigma-delta (same) | 16-bit sigma-delta (same) | 16-bit sigma-delta (same) |
| Core Frequency | 12.58 MHz | 12.58 MHz (same) | 12.58 MHz (same) | 12.58 MHz (same) | 12.58 MHz (same) | 12.58 MHz (same) |
| PGA Gain Range | 1 to 128 | 1 to 128 (same) | 1 to 128 (same) | 1 to 128 (same) | 1 to 128 (same) | 1 to 128 (same) |
| RoHS / Pb-free | Yes (S suffix) | Yes (S suffix) | Yes (S suffix) | Yes (S suffix) | Yes (S suffix) | No (legacy non-S) |
| Packaging Format | Tray | Tray | Tray | Tray | Tape & Reel | Tray |
Principais diferenciais
- Highest resolution primary ADC in the ADuC8xx family (vs ADUC832BSZ)
- On-chip PGA eliminates external instrumentation amplifier (vs ADUC831BSZ)
- Pb-free finish with full RoHS compliance (vs ADUC834BS)
- Same-package migration option within MicroConverter family (vs ADUC836BSZ)
Notas de projeto
Use a four-layer PCB with a dedicated analog ground plane under the ADC pins and a separate digital ground plane under the 8052 core and ports. Join analog and digital grounds at a single star point near the AGND pin (pin 42). According to the ADI ADuC834 datasheet layout guidance, this star-ground topology prevents digital return currents from flowing under the analog input traces, which preserves the 24-bit no-missing-code performance. Keep the bridge-sensor traces short and routed over the analog ground plane only, and place 100 nF ceramic bypass capacitors as close as possible to each AVDD and DVDD pin.
Power AVDD and DVDD from low-noise LDO regulators (for example an ADM3251EARWZ-derived 5V/3.3V rail) rather than directly from a switching converter. Estimated: at 12.58 MHz core clock the ADuC834BSZ typical DVDD current is in the low tens of mA, and the AVDD current plus reference current is similarly modest, so a small LDO with adequate PSRR at the sigma-delta modulator's sampling rate is sufficient. Add a ferrite bead or small series resistor between the LDO output and the DVDD pin if the upstream rail is a switching converter. This prevents switching-noise spurs from coupling into the ADC input.
Do not route the auxiliary 16-bit ADC input traces (AIN5/AIN6) parallel to or under switching converter traces or to digital I/O lines, as the sigma-delta modulator aliases high-frequency noise into the conversion result. The on-chip temperature sensor shares an analog input pin, so make sure the application firmware does not switch the temperature sensor channel during a precision measurement of an external transducer. According to the ADI product page, the PGA gain setting must be chosen before the input is applied to avoid saturating the modulator; saturating the modulator for more than a few conversion cycles will require a calibration cycle to restore linearity.
For precision bridge-sensor measurements, terminate the bridge with a high-stability external reference on VREF+ (pin 43) and a clean low-noise ground on VREF- (pin 44) rather than relying on the internal reference alone. The internal 2.5V reference on VREF2.5 (pin 52) is suitable for non-critical measurements, but for 24-bit no-missing-code performance an external ADR5044WBRTZ-R7 reference delivers tighter initial accuracy and lower drift. Place the reference bypass capacitors directly at the VREF pins and keep the reference trace away from the digital side of the PCB.
Estimated: at 12.58 MHz core clock with both ADCs active the ADuC834BSZ total power dissipation is roughly 100 mW typical, and the 52-MQFP package with normal four-layer PCB copper area yields a junction temperature rise of approximately 15 C above ambient. The -40C to +85C industrial operating range is comfortably satisfied, but in a fully sealed enclosure without airflow the local hot spot near the die may approach 90 C. Add thermal vias under the exposed die-attach pad (if the package variant includes one) to spread heat into the inner ground plane.
Informações de conformidade
RoHS compliance per ADI product page S suffix. AEC-Q100 not applicable (industrial MCU, not automotive qualified). Conflict-minerals status per Analog Devices corporate policy.
