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Analog Devices Inc. AD7709ARUZ
- Part No.:
- AD7709ARUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7709ARUZ.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 24TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:313
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Product details
Overview
AD7709ARUZ from Analog Devices is a 16-bit Σ-Δ ADC with integrated programmable gain amplifier (PGA), three switchable matched excitation current sources (200 µA, 200 µA, 25 µA), low-side power switches, and a 4-bit digital I/O port - designed for precision sensor front-end applications including RTD, thermocouple, and bridge transducer measurement. It supports ±20 mV to ±2.56 V input ranges, simultaneous 50/60 Hz rejection at 19.79 Hz update rate, and operates from single 3 V or 5 V supply.
For engineers reviewing the AD7709ARUZ datasheet, AD7709ARUZ pinout, AD7709ARUZ application, or AD7709ARUZ equivalent, key selection criteria include its 13-bit p-p resolution at 20 Hz on ±20 mV range, rail-to-rail buffered inputs, VREF Select™ for ratiometric/absolute measurement, ISOURCE Select™ for VBE sensing, and TSSOP-24 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The AD7709ARUZ implements a chopper-stabilized Σ-Δ architecture with Sinc³ digital filtering, enabling 16-bit no-missing-codes performance and ultra-low offset drift (±10 nV/°C). Its modulator sampling rate is fixed at 32.768 kHz via integrated crystal oscillator, and output data rate is software-programmable (5.4 Hz to 105 Hz) via 8-bit filter register (SF = 13–255).
It features dual reference inputs (REFIN1/REFIN2), configurable as two fully differential or four pseudo-differential analog channels (AIN1–AIN4 with AINCOM), plus on-chip functions including Schmitt-triggered serial interface (SPI/QSPI/MICROWIRE/DSP compatible), 3-wire operation, and power-down mode consuming only 7 µA with crystal running.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 16-bit no missing codes; 13-bit p-p at ±20 mV/20 Hz, 16-bit p-p at ±2.56 V/20 Hz - ensures high dynamic range for low-level sensor signals without code gaps. |
| Update Rate | 5.4 Hz to 105 Hz (software programmable); 19.79 Hz enables simultaneous 50 Hz & 60 Hz rejection - critical for AC-line noise immunity in industrial environments. |
| Excitation Currents | IEXC1/IEXC2 = 200 µA ±10% (200 ppm/°C drift); IEXC3 = 25 µA ±5%; matching ≤±2.5% - enables precise 3-/4-wire RTD and VBE measurements with minimal self-heating error. |
| Input Range Support | ±20 mV to ±2.56 V (gain = 1–128); fully differential or pseudo-differential configuration - accommodates wide variety of transducers without external signal conditioning. |
| Power Consumption | 1.25 mA typ @ 3 V (normal mode); 7 µA @ 3 V (power-down with crystal active) - enables battery-powered portable instrumentation with extended runtime. |
| Reference Flexibility | VREF Select™ allows absolute (external ref) or ratiometric (excitation current-derived) measurement - eliminates reference drift impact in bridge/RTD applications. |
| Common-Mode Rejection | 110 dB typ @ DC (±2.56 V range); ≥100 dB min @ 50/60 Hz - ensures robust performance against ground noise and EMI in noisy plant-floor environments. |
Pinout & Package
The AD7709ARUZ is housed in a 24-lead TSSOP (RU-24) package with exposed pad, optimized for thermal performance and board space efficiency in compact sensor modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 (IOUT1, IOUT2) | Excitation Current Outputs | Switchable outputs for IEXC1/IEXC2/IEXC3 - enable flexible current routing to RTD legs or transducer excitation paths. |
| 3–4, 10–11 (REFIN1±, REFIN2±) | Dual Reference Inputs | Independent positive/negative reference pairs support ratiometric (REFIN1) and absolute (REFIN2) measurement modes simultaneously. |
| 5–9, 13 (AIN1–AIN4, AINCOM, PWRGND) | Analog Input & Reference Ground | Configurable as 2× fully diff or 4× pseudo-diff channels; AINCOM serves as common-mode reference; PWRGND isolates switch return path. |
| 12, 14 (P2/SW2, P1/SW1) | Dual-Function Terminals | Programmable as GPIO bits or low-side power switches (RON ≤ 7 Ω @ 3 V) - simplifies discrete FET replacement in load control circuits. |
| 15–20 (RESET, SCLK, CS, RDY, DOUT, DIN) | Serial Interface Control | 3-wire SPI-compatible interface with Schmitt-triggered SCLK/CS/DIN - supports opto-isolation and noise-immune communication in industrial systems. |
| 21–24 (GND, VDD, XTAL2, XTAL1) | Power & Clock | Single-supply operation (2.7–3.6 V or 4.75–5.25 V); integrated 32.768 kHz crystal oscillator eliminates external clock components. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input buffer + PGA | Enables direct connection to high-impedance sensors (e.g., thermocouples, strain gauges) without external op-amps or level-shifting circuitry. |
| Simultaneous 50/60 Hz rejection | Achieved at 19.79 Hz update rate using Sinc³ filter notches - eliminates need for external notch filters or complex digital post-processing. |
| VREF Select™ and ISOURCE Select™ | Hardware-selectable reference and excitation source routing - simplifies firmware design for multi-sensor configurations (e.g., RTD + thermistor). |
| Chopper-stabilized Σ-Δ architecture | Reduces offset drift to ±10 nV/°C and enables <1 µV offset - critical for long-term stability in weigh-scale and pressure calibration systems. |
| Low-side power switches (SW1/SW2) | RON ≤ 7 Ω @ 3 V, 20 mA continuous rating - replaces discrete MOSFETs in 4–20 mA loop drivers or sensor excitation control with minimal BOM count. |
| 4-bit digital I/O port (P1–P4) | Configurable as inputs or outputs - provides local control signaling (e.g., alarm flags, LED drive) without requiring an external microcontroller GPIO expander. |
Applications
| Temperature Measurement | Pressure Transducers |
|---|---|
|
Use Scenario: High-accuracy RTD (Pt100/Pt1000) or thermocouple measurement in HVAC controllers and process monitoring systems. IC Role / Device Role / Timing Role: Precision analog front end performing ratiometric excitation, cold-junction compensation, and 16-bit digitization with 50/60 Hz line rejection. Use Value: Eliminates external PGA, reference, and excitation circuitry while delivering 0.1°C resolution over –40°C to +125°C range. |
Use Scenario: Industrial pressure sensing using Wheatstone bridge transducers in pump controls and hydraulic systems. IC Role / Device Role / Timing Role: Bridge excitation via matched current sources, differential input acquisition, and digital filtering for stable 0.05% FS accuracy. Use Value: Integrated low-side switches enable automatic bridge polarity reversal for offset cancellation, improving long-term zero stability. |
| Weigh Scales | Portable Instrumentation |
|
Use Scenario: Platform scales and benchtop analyzers requiring sub-gram resolution and legal-for-trade compliance. IC Role / Device Role / Timing Role: Low-noise Σ-Δ conversion of millivolt-level strain gauge outputs with 13-bit p-p resolution at 20 Hz update rate. Use Value: Chopper stabilization and Sinc³ filtering achieve <100 nV RMS noise floor - meets OIML R76 Class III requirements without external shielding. |
Use Scenario: Handheld multimeters, gas detectors, and battery-powered field testers needing low power and high integration. IC Role / Device Role / Timing Role: Single-chip sensor interface with 7 µA power-down mode, internal crystal oscillator, and 3-wire serial interface. Use Value: Reduces system power to <10 µA average in sleep mode while maintaining fast wake-up (<1 ms) - extends AA battery life to >2 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision Σ-Δ ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7190BRUZ | 24-bit resolution, higher PSR (105 dB), faster max update rate (4.8 kHz), but no integrated excitation currents or power switches. | Better suited for high-resolution static measurements (e.g., laboratory balances); lacks on-chip current sources for RTD excitation. | Select AD7709ARUZ when integrated 200 µA/25 µA excitation, low-side switches, and TSSOP-24 footprint are required for cost-sensitive embedded designs. |
| ADS1248IPWR | 24-bit, integrated PGA (1–128), 4-channel mux, but no excitation sources or power switches; requires external reference and clock. | Targeted at multi-channel sensor arrays (e.g., medical diagnostics); lacks VREF Select™ and ISOURCE Select™ hardware flexibility. | Choose AD7709ARUZ for applications demanding self-contained excitation, ratiometric measurement, and GPIO-integrated power control in a single RU-24 package. |
Compared with AD7709ARUZ, AD7190BRUZ offers higher resolution but requires external excitation circuitry and increases BOM count, while ADS1248IPWR provides more channels but lacks integrated current sources and power switches - making AD7709ARUZ uniquely suited for compact, low-cost RTD/bridge front ends with minimal external components.
Availability
AD7709ARUZ is available at Aetrix Electronics and suitable for temperature measurement, pressure transducer interfaces, and portable instrumentation requiring stable component supply across industrial and embedded OEM programs.
Supply support for AD7709ARUZ 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 AD7709ARUZ belongs to Analog Devices' precision Σ-Δ ADC product line, engineered specifically for low-frequency sensor signal conditioning in harsh environments - emphasizing integration, noise immunity, and ease of use in embedded measurement systems.
FAQ
What is the maximum update rate of the AD7709ARUZ, and how is it configured?
The AD7709ARUZ supports a maximum update rate of 105 Hz, achieved by programming the filter register (SF) to decimal 13. This value sets the Sinc³ decimation factor to 104 (13 × 8), yielding the fastest conversion time of 9.52 ms. The update rate is software-configurable via the 8-bit SF word, with valid range SF = 13 to 255 corresponding to 105 Hz down to 5.4 Hz. Each increment in SF increases conversion time by 0.732 ms, allowing precise trade-offs between speed and noise rejection in the AD7709ARUZ.
Does the AD7709ARUZ support both ratiometric and absolute reference configurations?
Yes, the AD7709ARUZ supports both configurations via its VREF Select™ feature. When using REFIN1(+) and REFIN1(–), the device performs ratiometric measurement - ideal for bridge sensors where excitation current and reference share the same source, canceling drift. When using REFIN2(+) and REFIN2(–), it operates in absolute mode with an external precision reference, enabling high-accuracy voltage measurements. Both reference inputs accept 1 V to VDD, and the AD7709ARUZ maintains ≥110 dB common-mode rejection in either mode.
Can the AD7709ARUZ drive RTDs directly, and what current sources are available?
Yes, the AD7709ARUZ integrates three switchable, matched excitation current sources optimized for RTD measurement: IEXC1 and IEXC2 are 200 µA ±10% (200 ppm/°C drift), and IEXC3 is 25 µA ±5%. These can be routed to IOUT1/IOUT2 pins and support 2-, 3-, or 4-wire RTD configurations. The current matching (≤±2.5% between IEXC1/IEXC2) and low drift ensure accurate resistance calculation without calibration - a core capability of the AD7709ARUZ in temperature sensing applications.
What package type and thermal characteristics does the AD7709ARUZ have?
The AD7709ARUZ is supplied in a 24-lead TSSOP package (RU-24) with exposed pad for enhanced thermal dissipation. Its thermal impedance is θJA = 97.9°C/W and θJC = 14°C/W, supporting operation from –40°C to +85°C. The package footprint is compatible with standard surface-mount assembly processes, and the exposed pad must be soldered to a thermal pad on the PCB to maintain junction temperature within limits during continuous 1.25 mA operation. This mechanical specification is integral to the AD7709ARUZ's reliability in enclosed industrial enclosures.
How does the AD7709ARUZ handle power management for battery-operated devices?
The AD7709ARUZ offers three power states: normal (1.25 mA @ 3 V), standby (7 µA @ 3 V), and power-down (7 µA @ 3 V with crystal running). In power-down mode, the ADC core and digital logic are disabled while the 32.768 kHz oscillator remains active, enabling fast wake-up (<1 ms) for event-triggered sampling. This architecture allows the AD7709ARUZ to achieve ultra-low average current in intermittent-read applications - such as wireless sensor nodes - without sacrificing timing accuracy or measurement integrity.
AD7709ARUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- -
AD7709ARUZ FAQ
1.How can I place an order for AD7709ARUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7709ARUZ 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 AD7709ARUZ reliable?
The price and inventory of AD7709ARUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7709ARUZ is usually 5 days.
3.What payment methods are accepted for AD7709ARUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7709ARUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7709ARUZ?
AD7709ARUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7709ARUZ 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 AD7709ARUZ?
For technical support, including AD7709ARUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7709ARUZ requirements.
6.How does Aetrix verify that AD7709ARUZ is sourced from the original manufacturer or authorized distributors?
All AD7709ARUZ 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 AD7709ARUZ meets industry standards.
7.What is the process for return or replacement of AD7709ARUZ?
All AD7709ARUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7709ARUZ, 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 AD7709ARUZ part is unused and in its original packaging.
Return procedure for AD7709ARUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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