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Analog Devices Inc. AD7705BRUZ-REEL
- Part No.:
- AD7705BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7705BRUZ-REEL.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,475
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Product details
Overview
AD7705BRUZ-REEL from Analog Devices is a 16-bit sigma-delta analog-to-digital converter with two fully differential input channels, programmable gain (1–128), 3-wire SPI-compatible serial interface, and operation at 2.7–3.3 V or 4.75–5.25 V. It delivers 0.003% nonlinearity, <600 nV rms noise, and 1 mW max power dissipation at 3 V - ideal for precision transducer signal conditioning in battery-powered industrial sensors.
For engineers reviewing the AD7705BRUZ-REEL datasheet, AD7705BRUZ-REEL pinout, AD7705BRUZ-REEL application, or AD7705BRUZ-REEL equivalent, key selection criteria include differential input architecture, on-chip calibration support, filter notch programmability, unipolar/bipolar range flexibility, and TSSOP-16 package compatibility with space-constrained PCB layouts.
Technical Context
The AD7705BRUZ-REEL employs a charge-balancing sigma-delta modulator followed by an on-chip digital filter with programmable first-notch frequency, enabling precise rejection of 50 Hz/60 Hz line interference. Its analog front end integrates a low-drift, rail-to-rail input buffer and a programmable-gain amplifier (PGA) optimized for direct connection to low-level transducers like strain gauges and RTDs.
It supports both unipolar (0 mV to 1.225 V) and bipolar (±10 mV to ±1.225 V) input ranges when using a 1.225 V reference at 3 V supply, with common-mode rejection exceeding 130 dB at gains ≥8. Calibration registers allow zero-scale and full-scale system calibration, eliminating offset and gain errors without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits, no missing codes - guarantees monotonicity and full code coverage across full temperature range. |
| Integral Nonlinearity | ±0.003% of FSR - ensures high-accuracy measurement integrity for calibrated sensor systems. |
| Input Channels | 2 fully differential analog inputs - supports simultaneous high-precision acquisition from dual transducers without multiplexing error. |
| Programmable Gain | 1 to 128 - enables direct digitization of microvolt-level signals (e.g., 20 mV full-scale strain gauge outputs) without external amplification. |
| Power Dissipation | 1 mW max @ 3 V - allows continuous operation in energy-sensitive portable instrumentation and wireless sensor nodes. |
| Digital Interface | 3-wire SPI/QSPI/MICROWIRE/DSP-compatible - reduces MCU GPIO count and simplifies isolation in industrial I/O modules. |
| Reference Input | Differential REF IN(+) / REF IN(−) - supports ratiometric measurements and eliminates reference drift impact on accuracy. |
Pinout & Package
AD7705BRUZ-REEL is housed in a 16-lead, low-profile, thin shrink small outline package (TSSOP) with 0.65 mm pitch, designed for automated surface-mount assembly and thermal performance in compact PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SCLK | Serial clock input | Schmitt-triggered logic input accepting discontinuous or continuous clocks; controls timing of data transfer on DIN/DOUT. |
| MCLK IN | Master clock input | Accepts external CMOS clock (400 kHz–2.5 MHz) or crystal/resonator connection; required for internal oscillator operation. |
| MCLK OUT | Master clock output | Inverted clock output usable as system clock source for external circuitry; disableable via CLKDIS bit to reduce power. |
| CS | Chip select | Active-low enable for 3-wire serial interface; hardwired low enables minimal-pin-count communication with SCLK/DIN/DOUT only. |
| RESET | Hardware reset | Active-low asynchronous reset restoring all registers, filter state, and calibration coefficients to power-on defaults. |
| AIN1(+), AIN1(−) | Channel 1 differential input | High-impedance, fully differential analog input pair supporting ±10 mV to ±1.225 V bipolar or 0–1.225 V unipolar ranges. |
| AIN2(+), AIN2(−) | Channel 2 differential input | Independent second differential input with identical range and PGA gain settings as Channel 1. |
| REF IN(+), REF IN(−) | Differential reference input | Defines full-scale range; supports 1.225 V (3 V supply) or 2.5 V (5 V supply); rejects common-mode noise up to 150 dB at 50/60 Hz. |
| DIN | Serial data input | Writes configuration data (setup, clock, calibration registers); accepts 8-/16-/24-bit commands per communication register protocol. |
| DOUT | Serial data output | Reads conversion results and register contents; tri-state when CS is high; synchronized to SCLK falling edge. |
| DRDY | Data ready indicator | Active-low open-drain output signaling valid conversion result in data register; used for interrupt-driven read synchronization. |
| GND | Analog/digital ground | Single ground pin shared for analog and digital sections; requires star grounding and separate AGND/DGND planes in layout. |
| VDD | Supply voltage | 2.7–3.3 V or 4.75–5.25 V single supply; powers analog modulator, digital filter, and serial interface; decoupling critical for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip self-calibration | Eliminates zero-scale and full-scale errors internally, removing need for external trim components and reducing production test time. |
| Programmable digital filter notch | Adjustable first-notch frequency (20 Hz to 60 Hz) enables optimal rejection of AC line interference without external analog filters. |
| Bipolar/unipolar mode selection | Configurable via B/U bit in setup register - supports both signed (±VREF/gain) and unsigned (0 to VREF/gain) input ranges in same hardware. |
| Low-power standby mode | 8 μA max current at 3 V - enables rapid wake-up (<100 μs) while preserving calibration state for duty-cycled sensor applications. |
| High CMR at high gain | 130 dB common-mode rejection at gains ≥8 - maintains accuracy in noisy industrial environments with ground potential differences. |
Applications
| Pressure Measurement | Temperature Monitoring |
|---|---|
Use Scenario: High-accuracy pressure sensing in HVAC control panels using silicon piezoresistive bridges with mV-level output. IC Role / Device Role / Timing Role: ADC front end performing direct digitization, PGA gain scaling, and 50/60 Hz notch filtering before MCU processing. Use Value: Achieves <0.1% FS accuracy over −40°C to +85°C without external op-amps or anti-aliasing filters due to integrated buffer and programmable filter. |
Use Scenario: Multi-point RTD-based temperature monitoring in industrial PLC analog input modules. IC Role / Device Role / Timing Role: Dual-channel ratiometric ADC converting 3-wire RTD voltage drops referenced to stable on-board 1.225 V reference. Use Value: Enables simultaneous channel sampling with matched gain/offset characteristics, reducing inter-channel crosstalk and calibration overhead. |
| Smart Transmitter | Battery Voltage Monitoring |
Use Scenario: 4–20 mA HART-enabled field transmitter with local diagnostics and sensor linearization. IC Role / Device Role / Timing Role: Precision ADC acquiring primary process variable (e.g., flow differential pressure) and secondary diagnostics (temperature, supply). Use Value: On-chip calibration registers allow field recalibration via HART command, eliminating need for manual potentiometer adjustment during maintenance. |
Use Scenario: Low-power battery management in portable medical devices requiring accurate cell voltage tracking over discharge curve. IC Role / Device Role / Timing Role: Ultra-low-power ADC measuring stacked Li-ion cell voltages with 16-bit resolution and <1 mW active consumption. Use Value: Standby current of 8 μA extends battery life between readings; programmable update rate balances resolution vs. throughput for SoC sleep cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7706BRUZ | 3-channel pseudo-differential input (vs. AD7705BRUZ-REEL's 2-channel fully differential); identical PGA, filter, and interface architecture. | Supports 3-input sensor arrays (e.g., 3-wire RTD + cold-junction compensation + supply monitor) without external multiplexer. | Select AD7706BRUZ when third analog input is required and pseudo-differential topology suffices for system noise immunity. |
| ADS1115IDGSR | 4-channel, 16-bit delta-sigma ADC with internal 2.048 V reference and I²C interface; no programmable filter notch or self-calibration registers. | Lacks 50/60 Hz rejection tuning and on-chip calibration - requires external reference stability and software-based offset correction. | Choose ADS1115IDGSR for cost-sensitive, I²C-based designs where layout constraints preclude SPI routing and moderate noise immunity is acceptable. |
Compared with AD7706BRUZ, AD7705BRUZ-REEL provides superior common-mode rejection and true differential input matching for high-precision bridge sensors; compared with ADS1115IDGSR, it offers deterministic line-frequency rejection and hardware-calibrated accuracy without firmware overhead.
Availability
AD7705BRUZ-REEL is available at Aetrix Electronics and suitable for pressure measurement, temperature monitoring, smart transmitter design, and battery voltage monitoring requiring stable component supply, long-term manufacturability, and guaranteed traceability.
Supply support for AD7705BRUZ-REEL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7705/AD7706 product line was engineered specifically for low-frequency, high-resolution sensor signal acquisition in resource-constrained embedded systems - emphasizing low power, integrated signal conditioning, and robust noise immunity without external components.
FAQ
What is the maximum sample rate of the AD7705BRUZ-REEL at gain = 1 and MCLK IN = 2.4576 MHz?
The AD7705BRUZ-REEL achieves a maximum output data rate of 384.6 SPS at gain = 1 and MCLK IN = 2.4576 MHz, calculated as fCLKIN/64. This rate corresponds to a 2.6 ms conversion time and supports effective 50 Hz/60 Hz rejection when the digital filter notch is set accordingly. The AD7705BRUZ-REEL maintains 16-bit no-missing-codes performance across this full range.
Does the AD7705BRUZ-REEL require an external reference voltage, or can it operate with an internal reference?
The AD7705BRUZ-REEL does not include an internal reference and requires an external differential reference applied to REF IN(+) and REF IN(−). For 3 V operation, a 1.225 V reference is recommended; for 5 V operation, a 2.5 V reference is specified. The AD7705BRUZ-REEL supports ratiometric configurations where the reference derives from the same supply as the transducer, improving system-level accuracy. No internal reference exists in the AD7705BRUZ-REEL.
Can the AD7705BRUZ-REEL interface directly with a microcontroller lacking SPI hardware?
Yes, the AD7705BRUZ-REEL supports bit-banged 3-wire serial communication using any three GPIO pins (CS, SCLK, DIN/DOUT), as its interface is synchronous and tolerant of variable clock timing. The Schmitt-triggered SCLK input accommodates slow or irregular edges, and DRDY provides hardware-ready signaling to minimize polling overhead. This makes the AD7705BRUZ-REEL compatible with low-pin-count MCUs and custom ASIC interfaces.
What is the absolute input voltage range allowed on AIN1(+) and AIN1(−) pins of the AD7705BRUZ-REEL?
For specified performance, the absolute voltage on AIN1(+) and AIN1(−) must remain between GND − 100 mV and VDD + 30 mV. With the input buffer enabled (BUF = 1), the common-mode range tightens to GND + 50 mV to VDD − 1.5 V. Operation down to GND − 200 mV is functional but increases leakage current at elevated temperatures - a condition explicitly noted in the AD7705BRUZ-REEL datasheet.
How does the AD7705BRUZ-REEL handle power-down mode, and what is the typical wake-up time?
The AD7705BRUZ-REEL enters standby mode when the RESET pin is held low or when the internal oscillator is disabled via the CLKDIS bit while MCLK IN is inactive. Standby current is 8 μA max at 3 V. Wake-up occurs within one master clock cycle after MCLK IN resumes or RESET is deasserted; full conversion readiness requires ~100 μs for filter settling and calibration stabilization. The AD7705BRUZ-REEL retains all register settings and calibration coefficients during standby.
AD7705BRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500
- Number of Inputs:
- 2
- Input Type:
- Differential
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.3V, 5V
- Voltage - Supply, Digital:
- 2.7V ~ 3.3V, 5V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7705BRUZ-REEL FAQ
1.How can I place an order for AD7705BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7705BRUZ-REEL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD7705BRUZ-REEL reliable?
The price and inventory of AD7705BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7705BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7705BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7705BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7705BRUZ-REEL?
AD7705BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7705BRUZ-REEL order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD7705BRUZ-REEL?
For technical support, including AD7705BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7705BRUZ-REEL requirements.
6.How does Aetrix verify that AD7705BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7705BRUZ-REEL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7705BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7705BRUZ-REEL?
All AD7705BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7705BRUZ-REEL, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD7705BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7705BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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