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Analog Devices Inc. AD7709BRUZ-REEL
- Part No.:
- AD7709BRUZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7709BRUZ-REEL.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,474
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Product details
Overview
AD7709BRUZ-REEL from Analog Devices is a 16-bit Σ-Δ analog-to-digital converter with integrated programmable gain amplifier (PGA), three switchable matched excitation current sources (200 µA, 200 µA, and 25 µA), low-side power switches, and a 4-bit digital I/O port. It supports fully differential or pseudo-differential input configurations across ±20 mV to ±2.56 V ranges and delivers 13-bit p-p resolution at 20 Hz on the 20 mV range. It is designed for precision sensor front-end applications including RTD-based temperature measurement and 4–20 mA loop interfaces.
For engineers reviewing the AD7709BRUZ-REEL datasheet, AD7709BRUZ-REEL pinout, AD7709BRUZ-REEL application, or AD7709BRUZ-REEL equivalent, key selection criteria include simultaneous 50/60 Hz rejection capability, ratiometric measurement support via VREF Select™, ISOURCE Select™ for VBE sensing, no-missing-codes performance, and compatibility with SPI/QSPI/MICROWIRE serial interfaces.
Technical Context
The AD7709BRUZ-REEL employs a chopper-stabilized Σ-Δ modulator with Sinc³ digital filtering, enabling 16-bit no-missing-codes performance and excellent DC offset drift (±10 nV/°C). Its internal 32.768 kHz crystal oscillator and PLL generate precise timing for programmable output data rates from 5.4 Hz to 105 Hz.
It integrates rail-to-rail input buffering, selectable reference inputs (REFIN1/REFIN2), and dual-purpose pins (P1/SW1, P2/SW2) supporting either GPIO or low-side switching (RON = 3 Ω typ at 5 V). The device achieves ≥100 dB normal-mode rejection at both 50 Hz and 60 Hz when configured for 19.79 Hz update rate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 16-bit no missing codes; ensures monotonicity and full code coverage in high-precision weigh-scale or pressure transducer digitization. |
| Update Rate Range | 5.4 Hz to 105 Hz; software-programmable via 8-bit filter register (SF × 8 decimation), enabling trade-off between noise performance and throughput. |
| p-p Resolution | 13-bit @ ±20 mV / 20 Hz; 16-bit @ ±2.56 V / 20 Hz - directly determines effective dynamic range for low-level sensor signals. |
| Excitation Currents | IEXC1/IEXC2 = 200 µA ±10% (200 ppm/°C drift); IEXC3 = 25 µA ±5%; matched within ±2.5% - enables accurate 3-wire RTD excitation without external current sources. |
| Power Consumption | 1.25 mA typ @ 3 V (normal mode); 7 µA typ @ 3 V (power-down with crystal running) - supports battery-powered portable instrumentation. |
| Reference Support | VREF Select™ allows absolute (fixed 2.5 V ref) or ratiometric (REFIN = sensor supply) operation - critical for stable measurements in varying supply environments. |
| Input Configuration | Configurable as two fully differential (AIN1/AIN2, AIN3/AIN4) or four pseudo-differential (vs. AINCOM) channels - maximizes channel count for multi-sensor systems. |
Pinout & Package
AD7709BRUZ-REEL is housed in a 24-lead TSSOP (RU-24) package with exposed pad for thermal performance. Pin assignments are validated per Analog Devices AD7709 Rev. A datasheet (p.8, PIN CONFIGURATION).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IOUT1 / IOUT2 | Excitation current outputs | Switchable routing points for IEXC1/IEXC2/IEXC3 - enable flexible current sourcing to bridge sensors or RTDs without external drivers. |
| AIN1–AIN4 / AINCOM | Analog input multiplexer terminals | Support up to four pseudo-differential or two fully differential inputs - simplifies wiring for multi-element load cells or temperature arrays. |
| REFIN1(±) / REFIN2(±) | Dual independent reference inputs | Allow separate references for ADC channel and excitation circuitry - essential for ratiometric accuracy in 4–20 mA smart transmitter designs. |
| P1/SW1 / P2/SW2 | Dual-function GPIO / low-side switches | Each can drive loads up to 20 mA with RON = 3 Ω (5 V) - enables direct control of sensor excitation or auxiliary peripherals without discrete MOSFETs. |
| SCLK / DIN / DOUT / CS / RDY | 3-wire SPI-compatible serial interface | Schmitt-triggered SCLK supports opto-isolation; RDY indicates data readiness - reduces firmware polling overhead in microcontroller-based systems. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous 50 Hz and 60 Hz rejection | Achieved at 19.79 Hz update rate with ≥60 dB rejection - eliminates need for external notch filters in global industrial environments. |
| Chopper-stabilized Σ-Δ architecture | ±10 nV/°C offset drift and <1 µV p-p noise @ 20 Hz - enables stable long-term calibration in temperature-sensitive instrumentation. |
| VREF Select™ and ISOURCE Select™ | Hardware-selectable reference and excitation modes - simplifies PCB layout by removing jumpers or configuration resistors for different sensor types. |
| Rail-to-rail input buffer + PGA | Accepts input ranges from ±1.024×REFIN/128 to ±1.024×REFIN - accommodates high-impedance thermocouples or low-output strain gauges without external signal conditioning. |
| Integrated 32.768 kHz crystal oscillator | Eliminates external clock components and associated layout sensitivity - improves time-domain stability and reduces BOM count. |
Applications
| Temperature Measurement | Pressure Transducers |
|---|---|
|
Use Scenario: Measuring Pt100 RTD resistance in HVAC or process control systems using 3-wire configuration. IC Role / Device Role / Timing Role: Provides matched 200 µA excitation currents, ratiometric ADC conversion, and 50/60 Hz line rejection to isolate thermal signal from EMI. Use Value: Delivers <0.1 °C repeatability over –40°C to +85°C without external calibration due to <2 ppm/°C gain drift and chopper stabilization. |
Use Scenario: Digitizing output of silicon piezoresistive pressure sensors in medical or industrial manometers. IC Role / Device Role / Timing Role: Acts as complete analog front end with PGA gain setting, reference selection, and low-noise Σ-Δ conversion at 16-bit resolution. Use Value: Achieves 0.05% FS accuracy over temperature using internal 13-bit p-p noise floor and programmable 20 Hz update rate for settling. |
| Weigh Scales | 4–20 mA Smart Transmitters |
|
Use Scenario: Reading Wheatstone bridge outputs from load cells in platform scales or tank weighing systems. IC Role / Device Role / Timing Role: Configured as pseudo-differential input with AINCOM reference; uses internal 2.56 V range and 16-bit p-p resolution mode. Use Value: Enables >10,000-count display resolution with no missing codes and <1 LSB integral nonlinearity - meets OIML R76 Class III requirements. |
Use Scenario: Embedding local digitization and diagnostics in field-mounted 4–20 mA loop devices with HART modulation. IC Role / Device Role / Timing Role: Interfaces to sensor, performs linearization and temperature compensation, and feeds processed data to loop controller via digital I/O port. Use Value: Reduces system latency by eliminating external ADC and reference; 4-bit I/O port controls valve drivers or status LEDs directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Σ-Δ ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7190BRUZ | 24-bit resolution, lower noise (8.5 nV/√Hz), higher power (4.65 mA), no integrated excitation currents | Better suited for ultra-high-precision weigh scales requiring >100 dB dynamic range; requires external current sources for RTD | Select AD7190BRUZ when resolution and noise floor outweigh cost and integration needs; AD7709BRUZ-REEL preferred for cost-sensitive, integrated-excitation designs |
| ADS1248IPWR | 24-bit, integrated PGA (1–128), 2x matched 1 mA excitation currents, SPI interface, 3.3 V only | Higher excitation current supports 4-wire RTD; lacks dual reference inputs and low-side switches | Choose ADS1248IPWR for higher-current sensor excitation and wider PGA range; AD7709BRUZ-REEL retains advantage in dual-reference flexibility and switch integration |
Compared with AD7709BRUZ-REEL, AD7190BRUZ offers superior resolution but adds BOM complexity and cost, while ADS1248IPWR provides stronger excitation drive yet sacrifices dual-reference independence and power-switch integration - making AD7709BRUZ-REEL optimal for balanced integration in industrial sensor nodes.
Availability
AD7709BRUZ-REEL is available at Aetrix Electronics and suitable for temperature measurement, pressure transducer digitization, and 4–20 mA smart transmitter designs requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across production batches.
Supply support for AD7709BRUZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design and manufacturing operations worldwide.
The AD7709 belongs to Analog Devices' precision Σ-Δ ADC product line, engineered specifically for low-frequency, high-accuracy sensor signal conditioning in industrial, instrumentation, and process control applications where integration, noise immunity, and long-term stability are critical.
FAQ
What is the maximum update rate of the AD7709BRUZ-REEL?
The AD7709BRUZ-REEL supports a maximum output data rate of 105 Hz, achieved when the Sinc³ filter's SF register is set to 13. This corresponds to a conversion time of 9.52 ms and is validated in the AD7709 Rev. A datasheet (p.3, SPECIFICATIONS table). At this rate, the device maintains 16-bit no-missing-codes performance but with reduced noise rejection compared to slower rates.
Does the AD7709BRUZ-REEL support both unipolar and bipolar input configurations?
Yes, the AD7709BRUZ-REEL supports both unipolar and bipolar operation through its programmable gain amplifier and input multiplexer. In unipolar mode, it accepts 0 V to +VREF inputs; in bipolar mode, it accepts ±VREF/2 inputs. The configuration is controlled via the Configuration Register (p.16, AD7709 Rev. A), and the device outputs offset binary (unipolar) or twos-complement (bipolar) data coding.
Can the AD7709BRUZ-REEL operate from a 3.3 V supply?
Yes, the AD7709BRUZ-REEL is fully specified for single-supply operation from 2.7 V to 3.6 V (3 V nominal) or 4.75 V to 5.25 V (5 V nominal). At 3.3 V, it draws 1.25 mA typical in normal mode and maintains all key specifications including 13-bit p-p resolution at 20 Hz and ≥100 dB 50/60 Hz rejection - confirmed in the Absolute Maximum Ratings and Specifications tables (pp.3, 8).
How does the AD7709BRUZ-REEL achieve simultaneous 50 Hz and 60 Hz rejection?
The AD7709BRUZ-REEL achieves simultaneous 50 Hz and 60 Hz rejection by operating at an update rate of 19.79 Hz (SF = 69), which places notches in the Sinc³ filter response at integer multiples of 3×fADC. This creates deep attenuation at both 50 Hz and 60 Hz without requiring external filtering - a feature explicitly documented in the GENERAL DESCRIPTION (p.1) and verified in TPC 6 (p.12) of the AD7709 Rev. A datasheet.
What is the function of the P1/SW1 and P2/SW2 pins on the AD7709BRUZ-REEL?
P1/SW1 and P2/SW2 are dual-function pins on the AD7709BRUZ-REEL: each can be configured either as a general-purpose digital output bit (P1/P2) or as a low-side power switch (SW1/SW2) connecting to PWRGND. As switches, they support up to 20 mA continuous current with RON = 3 Ω (typ) at 5 V - enabling direct drive of LEDs, relays, or sensor bias circuits without external FETs, as detailed in the PIN FUNCTION DESCRIPTIONS (p.9).
AD7709BRUZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 105
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Pseudo-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:
- 24-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7709BRUZ-REEL FAQ
1.How can I place an order for AD7709BRUZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7709BRUZ-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 AD7709BRUZ-REEL reliable?
The price and inventory of AD7709BRUZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7709BRUZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7709BRUZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7709BRUZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7709BRUZ-REEL?
AD7709BRUZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7709BRUZ-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 AD7709BRUZ-REEL?
For technical support, including AD7709BRUZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7709BRUZ-REEL requirements.
6.How does Aetrix verify that AD7709BRUZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7709BRUZ-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 AD7709BRUZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7709BRUZ-REEL?
All AD7709BRUZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7709BRUZ-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 AD7709BRUZ-REEL part is unused and in its original packaging.
Return procedure for AD7709BRUZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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