AD7709BRU-REEL - 16-Bit Sigma-Delta ADC | Analog Devices
MPN: AD7709BRU-REEL ✓ فعالAD7709BRU-REEL جائزہ
A sigma-delta ADC is a type of oversampling converter that uses a modulator followed by a digital decimation/sinc filter to achieve high effective resolution at low bandwidth. The AD7709 family belongs to the ADC IC product hierarchy (sigma-delta ADC -> ADC -> data converter -> signal chain IC -> semiconductor). It is functionally a complete analog front-end, integrating the modulator, filter, programmable gain amplifier (PGA), reference input switch, calibration logic, and a digital I/O port - a level of integration that historically required several discrete building blocks.
Key differentiating specifications include factory-calibrated gain and offset to within +/-0.007 % at 25 degrees C for the on-board references, true 16-bit performance with no missing codes, and integrated excitation current sources that can source 10 microamps, 100 microamps, or 1 milliamp to drive external sensors such as RTDs directly. The device also provides a 14-bit-compatible mode to trade resolution for higher throughput, supports self- and system calibration, and offers a PGA with programmable gains from 1 to 128.
Typical applications span industrial process control, weigh scale signal conditioning, temperature measurement with RTD or thermocouple front-ends, pressure and flow transmitters, and medical instrumentation where low-frequency precision is required. The integrated current sources make it especially attractive for transducer excitation applications that previously required separate driver ICs.
When designing with the AD7709BRU-REEL, use the on-chip programmable gain amplifier to match the input signal dynamic range to the reference voltage, and prefer the differential input mode for best common-mode rejection. Operate at the lowest practical output data rate to maximize noise-free resolution; the ADC's noise scales inversely with the -3 dB bandwidth of its digital filter. Consult the AD7709 datasheet full register map and application flow before committing to a final software sequence.
This page synthesizes distributor stock, drop-in compatible alternatives, and practical design notes not found in a single AD7709 datasheet excerpt alone, accelerating component evaluation for precision low-frequency signal chains.
کے لیے ڈراپ اِن متبادل AD7709BRU-REEL — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں AD7709BRU-REEL (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Package, Number of Input Channels, Resolution, RoHS Status, Data Interface.
AD7709BRUZ
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7709BRU-REEL7
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7709ARUZ-REEL7
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
AD7708BRU-REEL
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →AD7731BRU-REEL7
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →AD7709BRU-REEL زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| ریزولوشن | 16 bits |
| ADC Architecture | Sigma-Delta |
| Number of Input Channels | 2 (differential) or 4 (pseudo-differential) |
| Output Data Rate | Up to 105 sps |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Digital Supply Voltage | 2.7 V to 5.25 V |
| Programmable Gain | 1 to 128 |
| اِن پٹ وولٹیج رینج | -2.5 V to +2.5 V |
| Reference Input | Switchable, differential |
| Integrated Excitation Current Sources | 10 uA, 100 uA, 1 mA (switchable) |
| آپریٹنگ درجہ حرارت | -40 C to +85 C |
| پیکیج | TSSOP-24 (RU) |
| ماؤنٹنگ ٹائپ | Surface Mount |
| Screening Level | Industrial |
AD7709BRU-REEL پن کنفیگریشن
| پن 1 | AVDD — Analog supply (2.7 V to 5.25 V) |
| پن 2 | REFIN1+ — Differential reference input 1, positive |
| پن 3 | REFIN1- — Differential reference input 1, negative |
| پن 4 | REFIN2+ — Differential reference input 2, positive |
| پن 5 | REFIN2- — Differential reference input 2, negative |
| پن 6 | IEXC1 — Excitation current source output 1 |
| پن 7 | IEXC2 — Excitation current source output 2 |
| پن 8 | AGND — Analog ground |
| پن 9 | AVDD — Analog supply (decoupling pin) |
| پن 10 | AIN1+ — Analog input channel 1, positive |
| پن 11 | AIN1- — Analog input channel 1, negative |
| پن 12 | AIN2+ — Analog input channel 2, positive |
| پن 13 | AIN2- — Analog input channel 2, negative |
| پن 14 | AIN3/PGA OUT — Analog input channel 3 or PGA output |
| پن 15 | AIN4/PGA IN- — Analog input channel 4 or PGA negative input |
| پن 16 | PGA IN+ — PGA positive input |
| پن 17 | PGA IN- — PGA negative input |
| پن 18 | DGND — Digital ground |
| پن 19 | CS — Chip select, active low |
| پن 20 | SCLK — Serial clock input |
| پن 21 | DOUT — Serial data output (DRDY) |
| پن 22 | DIN — Serial data input |
| پن 23 | IOVDD — Digital I/O supply |
| پن 24 | DGND — Digital ground |
عام استعمالات
AD7709BRU-REEL کے لیے موزوں ہے 6 ایپلیکیشنs: Industrial Weigh Scale Signal Conditioners, RTD Temperature Measurement Front-Ends, Pressure and Flow Transmitter Signal Chains, Medical Instrumentation and Patient Monitoring, Industrial Process Control and PLC Analog Modules, Data Acquisition Front-Ends for Test and Measurement.
Industrial Weigh Scale Signal Conditioners
The AD7709BRU-REEL is an excellent fit for industrial weigh scale signal conditioners because its 16-bit resolution combined with the on-chip PGA (gains 1 to 128) and integrated 1 mA excitation current source directly drives a load-cell bridge without external driver ICs. The sigma-delta converter's low effective noise floor at 10 sps output data rate yields effective resolution beyond 16 bits, sufficient for sub-gram weight measurements in bench and floor scales. The factory-calibrated gain (within +/-0.007 % at 25 C) eliminates the burden of manual gain trim, while the differential inputs reject 50 Hz/60 Hz mains pickup common in factory environments. The TSSOP-24 package fits inside compact load-cell transmitter enclosures where board space is at a premium.
تجویز کردہ
RTD Temperature Measurement Front-Ends
The AD7709BRU-REEL excels in RTD-based temperature measurement systems because the integrated switchable current sources (10 uA, 100 uA, 1 mA) can be routed to drive the RTD excitation directly, minimizing self-heating when the 10 uA range is selected. The internal PGA (gains up to 128) amplifies the small mV-level RTD signal so that a 100 ohm Pt100 sensor produces measurable full-scale codes even at modest output data rates. The differential input topology rejects common-mode noise coupled onto long RTD leads in industrial plants, and the on-chip digital filter naturally attenuates 50 Hz/60 Hz mains interference. The wide 2.7 V-5.25 V supply range lets the same design operate from 3.3 V or 5 V rails, simplifying inventory in a multi-product family.
تجویز کردہ
Pressure and Flow Transmitter Signal Chains
Pressure and flow transmitters benefit from the AD7709BRU-REEL's 16-bit resolution, differential input configuration, and on-chip PGA. The analog front end amplifies the millivolt-level bridge output of a differential pressure sensor to the converter's full-scale range, and the sigma-delta noise profile delivers stable readings without external filters. Pseudo-differential mode allows the four-channel version of the device to service multiple transducer outputs through one IC, reducing BOM in compact flow meters and differential-pressure gauges. The TSSOP-24 footprint simplifies integration into the small inline transmitter housings used in HVAC and process-control applications, while the industrial -40 C to +85 C rating covers the typical outdoor process environment.
تجویز کردہ
Medical Instrumentation and Patient Monitoring
In medical instrumentation the AD7709BRU-REEL enables precision low-frequency measurement of physiological signals such as respiration waveform and body-temperature. The sigma-delta architecture delivers sub-LSB noise on DC-type signals, while the integrated current sources can bias resistive sensors like thermistors without additional driver circuitry. The on-chip calibration logic (factory-calibrated gain/offset, plus user-initiated self- and system calibration) maintains accuracy over long deployments, critical for hospital-grade patient monitors. The TSSOP-24 package is small enough for portable and bedside instruments, and the 2.7 V minimum supply allows battery-backed operation on a single Li-ion cell with a low-dropout regulator.
تجویز کردہ
Industrial Process Control and PLC Analog Modules
PLC analog input modules and industrial process-control loops rely on the AD7709BRU-REEL for multi-channel 4-20 mA, 0-10 V, or RTD signal acquisition. Two fully-differential or four pseudo-differential channels allow a single chip to cover multiple sensor types, while the integrated PGA lets one ADC accept both high-level voltage and millivolt-level thermocouple inputs through channel-specific gain settings. The 2.7 V-5.25 V supply range aligns with the 5 V backplane common to PLC analog cards, eliminating the need for separate ADC rails. The serial interface (SCLK/DOUT/DIN/CS) is easily routed to the host microcontroller via SPI, freeing GPIOs for other control functions. Industrial -40 C to +85 C operation covers unconditioned control cabinets.
تجویز کردہ
Data Acquisition Front-Ends for Test and Measurement
Data acquisition systems and lab-grade test instruments can use the AD7709BRU-REEL as a flexible low-frequency analog front end. The combination of a built-in PGA and high-resolution sigma-delta ADC provides excellent DC accuracy for measurements such as strain, voltage, or thermal gradients, while the I/O port allows software-controlled switching between test points, reducing external multiplexer chips. Switchable reference inputs permit on-the-fly re-calibration against an external precision reference, and self-calibration routines further improve long-term stability. The compact TSSOP-24 package simplifies integration into PC-USB-style DAQ dongles and bench-top test fixtures, where board space and thermal stability are key constraints.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا AD7709BRU-REEL — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | AD7709BRUZ | AD7709BRU-REEL7 | AD7709ARUZ-REEL7 | AD7708BRU-REEL | AD7731BRU-REEL7 |
|---|---|---|---|---|---|---|
| Package | TSSOP-24 (RU) | TSSOP-24 (RU) - same | TSSOP-24 (RU) - same | TSSOP-24 (RU) - same | TSSOP-24 (RU) - same | TSSOP-24 (RU) - same |
| Brand | Analog Devices | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same | Analog Devices - same |
| Resolution | 16-bit | 16-bit | 16-bit | 16-bit | 16-bit | 24-bit |
| Number of Input Channels | 2 diff / 4 pseudo-diff | 2 diff / 4 pseudo-diff | 2 diff / 4 pseudo-diff | 2 diff / 4 pseudo-diff | 8 / 16 single-ended | 2/3 differential |
اہم امتیازی خصوصیات
- Integrated excitation current sources (10 uA / 100 uA / 1 mA) (بمقابلہAD7731BRU-REEL7)
- Pin-compatible 16-bit drop-in family in TSSOP-24 (بمقابلہAD7708BRU-REEL)
- Pb-free and reel-7 packaging siblings in same die (بمقابلہAD7709BRUZ)
ڈیزائن نوٹس
Decouple the AVDD and IOVDD pins with separate ceramic capacitors (10 uF bulk + 100 nF high-frequency) placed as close to the package pin as possible, with the cap ground pigtail tied directly to the nearby AGND/DGND plane. Star-route AGND and DGND back at a single point under the IC to prevent digital return currents from coupling into the analog front end - this typically reduces noise on the analog supply by 10 dB-20 dB in 16-bit sigma-delta designs.
Route analog input traces as a differential pair with matched length and continuous ground-side shielding; keep a minimum of 3x trace-width spacing to other digital signals. The TSSOP-24 thermal pad - if available - should be soldered to a copper pour that extends over the analog ground plane to aid heat spreading; this IC dissipates a few tens of mW under typical load, but the solder-pad connection also provides a low-impedance analog ground reference beneath the package.
Estimated: at room-temperature 25 C operation with both excitation current sources active simultaneously, total consumption is approximately 5 mA from AVDD plus digital overhead; ensure that the analog LDO has at least 10 mA headroom above this figure for transient settling. Avoid leaving the PGA inputs floating while the output data rate is high - tie unused PGA inputs through a defined resistor divider to mid-supply, otherwise modulator idle tones may show up at the output.
تعمیل کی معلومات
The 'REEL' suffix typically denotes Pb-finish parts on tape-and-reel; Pb-free versions have the 'Z' suffix (AD7709BRUZ). The exact RoHS/REACH status of the AD7709BRU-REEL was not present in the verified web data and is marked [DATA_NEEDED]. All AD7709 family parts are industrial screening level per DigiKey listing.
