My Inquiry
My Account
Analog Devices Inc. AD7708BRZ-REEL7
- Part No.:
- AD7708BRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7708BRZ-REEL7.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,182
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7708BRZ-REEL7 from Analog Devices is a 16-bit, 8-/10-channel Σ-Δ analog-to-digital converter optimized for low-frequency industrial measurement. It features programmable gain (1–128), simultaneous 50 Hz/60 Hz rejection, rail-to-rail input buffering, and operates from single 3 V or 5 V supplies with 1.28 mA typical current draw at 3 V. It is used in smart transmitters and portable instrumentation where high resolution and noise immunity are critical.
For engineers reviewing the AD7708BRZ-REEL7 datasheet, AD7708BRZ-REEL7 pinout, AD7708BRZ-REEL7 application, or AD7708BRZ-REEL7 equivalent, key selection criteria include its 16-bit no-missing-codes performance, CHOP-mode vs. non-CHOP trade-offs, VREF Select™ ratiometric/absolute measurement capability, and compatibility with SPI/QSPI/MICROWIRE interfaces in space-constrained SOIC-28 layouts.
Technical Context
The AD7708BRZ-REEL7 integrates a Σ-Δ modulator with on-chip programmable gain amplifier (PGA), 2-bit digital I/O port, and PLL-based clock generation from a 32.768 kHz crystal. Its signal chain supports both chop-enabled (low drift, 5.4–105 Hz update) and non-chop (higher throughput, 16.06 Hz–1.365 kHz) operation modes.
It accepts pseudo-differential or fully differential inputs across up to 10 channels, with two pins (REFIN2+/AIN9 and REFIN2−/AIN10) configurable as analog inputs or reference inputs. Input ranges span ±20 mV to ±2.56 V directly, eliminating external signal conditioning for transducer interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit no-missing-codes; ensures monotonicity across full scale without code gaps. |
| Input Channels | 8 pseudo-differential or 4 fully differential inputs; AIN1–AIN8 plus AINCOM, with REFIN2(±) reconfigurable as AIN9/AIN10. |
| Update Rate Range | 5.4 Hz to 1.365 kHz; software-selectable to balance noise performance (chop mode) vs. throughput (non-chop mode). |
| Simultaneous Rejection | 100 dB min @ 50 Hz and 60 Hz; enables robust operation in noisy AC-powered industrial environments. |
| Power Consumption | 3.84 mW typ @ 3 V; supports battery-powered portable instrumentation and low-power sensor nodes. |
| Reference Flexibility | VREF Select™ allows absolute (fixed 2.5 V ref) or ratiometric (transducer excitation-derived ref) measurement modes. |
| Interface Protocol | 3-wire SPI/QSPI/MICROWIRE-compatible serial interface with Schmitt-triggered SCLK for noise immunity. |
Pinout & Package
The AD7708BRZ-REEL7 is housed in a 28-lead SOIC package (R-28), RoHS-compliant and tape-and-reel packaged per REEL7 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN8 | Analog input channels | Programmable-gain buffered inputs; support pseudo-differential (vs. AINCOM) or fully differential (paired) configurations. |
| AINCOM | Common analog input reference | Shared reference node for pseudo-differential channels; voltage range extends beyond AGND/AVDD by ±30 mV when NEGBUF = 0. |
| REFIN1(+), REFIN1(–) | Main reference inputs | Accept 1 V to AVDD differential range; nominal 2.5 V reference enables precise scaling of ADC full-scale. |
| REFIN2(+)/AIN9, REFIN2(–)/AIN10 | Configurable dual-function pins | Can serve as secondary reference inputs or additional analog input channels-selected via register configuration. |
| DOUT, DIN, SCLK, CS, RDY | Serial interface signals | 3-wire SPI-compatible interface; RDY indicates data ready; Schmitt-triggered SCLK improves noise margin. |
| AVDD, AGND, DVDD, DGND | Power and ground rails | Separate analog/digital supplies allow noise isolation; AGND–DGND offset limited to ±50 mV for accuracy. |
| P1, P2 | 2-bit digital I/O port | General-purpose bidirectional pins usable for status signaling or control in compact systems. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-calibrated architecture | Eliminates need for system-level calibration in most applications; offset and gain errors reduced to sub-LSB levels post-self-calibration. |
| Programmable CHOP mode | Reduces offset drift to 10 nV/°C and enhances PSR to 100 dB, critical for precision DC measurements over temperature. |
| Rail-to-rail input buffer + PGA | Supports direct connection of low-output transducers (e.g., pressure sensors) without external op-amps or level-shifting circuitry. |
| Single-cycle conversion setting | Enables deterministic timing for synchronized multi-channel sampling in PLC and DAQ systems. |
| On-chip oscillator + PLL | Removes need for external clock source; 32.768 kHz crystal provides stable timing with minimal board area and BOM count. |
Applications
| Industrial Process Control | Smart Transmitters |
|---|---|
Use Scenario: Monitoring temperature, pressure, and flow in distributed control systems with 4–20 mA loop integration. IC Role / Device Role / Timing Role: Primary ADC front-end converting sensor outputs to digital values for microcontroller processing and HART communication. Use Value: Simultaneous 50/60 Hz rejection ensures accurate readings in electrically noisy plant-floor environments without external notch filters. | Use Scenario: Digitizing analog sensor signals in field-mounted devices with limited power and PCB space. IC Role / Device Role / Timing Role: High-resolution signal acquisition engine enabling 16-bit precision within ultra-low-power, battery-operated enclosures. Use Value: 3.84 mW typical power at 3 V and integrated reference flexibility reduce external component count and extend battery life. |
| Portable Instrumentation | Pressure Transducers |
Use Scenario: Handheld multimeters, data loggers, and calibration tools requiring high accuracy and portability. IC Role / Device Role / Timing Role: Core measurement IC handling multiple sensor types (thermocouple, RTD, voltage) via programmable input configuration. Use Value: Pin-configurable REFIN2(±) pins enable dual-reference or expanded channel count-maximizing utility in multi-function instruments. | Use Scenario: Converting millivolt-level bridge outputs from strain-gauge-based pressure sensors. IC Role / Device Role / Timing Role: Direct interface to Wheatstone bridge with PGA gain up to 128, eliminating discrete instrumentation amplifier stages. Use Value: Rail-to-rail input buffer accepts common-mode voltages near AVDD or AGND, simplifying biasing for unbuffered bridges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7718BRZ | 24-bit resolution, identical pinout and register map; higher noise performance but lower max update rate in chop mode. | Used where ultra-high resolution (e.g., laboratory-grade weighing) outweighs throughput needs. | Select AD7718BRZ only if 24-bit ENOB and <100 nV/°C offset drift are required; otherwise AD7708BRZ-REEL7 offers optimal cost/performance for 16-bit industrial use cases. |
| ADS1258IPWR | 24-bit, 12-channel, SPI interface; no on-chip oscillator or VREF Select™; requires external clock and reference. | Suitable for high-channel-count systems where external timing/reference control is preferred. | Choose ADS1258IPWR when expanding beyond 10 channels or integrating into existing clock/reference infrastructure; AD7708BRZ-REEL7 reduces design complexity with integrated resources. |
Compared with AD7718BRZ and ADS1258IPWR, the AD7708BRZ-REEL7 delivers the best balance of integration (on-chip oscillator, VREF Select™, I/O port), industrial-grade noise immunity, and 16-bit precision-making it ideal for cost-sensitive, space-constrained, and noise-prone measurement nodes.
Availability
AD7708BRZ-REEL7 is available at Aetrix Electronics and suitable for industrial process control, smart transmitter design, and portable instrumentation requiring stable component supply and long-term manufacturability.
Supply support for AD7708BRZ-REEL7 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, serving industrial, automotive, communications, and healthcare markets.
The AD7708BRZ-REEL7 belongs to Analog Devices' precision Σ-Δ ADC product line, designed specifically for low-frequency, high-accuracy measurement in harsh electrical environments-emphasizing ease of use, integrated functionality, and robustness over raw speed.
FAQ
What is the maximum update rate of the AD7708BRZ-REEL7 in non-chop mode?
The AD7708BRZ-REEL7 achieves a maximum update rate of 1.365 kHz in non-chop (CHOP = 1) mode, optimized for higher throughput at the expense of slightly increased offset drift. This mode is ideal for applications requiring faster sampling while maintaining 16-bit no-missing-codes performance across its full input range.
Does the AD7708BRZ-REEL7 require an external crystal oscillator?
Yes, the AD7708BRZ-REEL7 requires a 32.768 kHz crystal connected between XTAL1 and XTAL2 pins. Its internal PLL generates all necessary clock frequencies, eliminating the need for external clock dividers or logic, but the crystal itself is mandatory for guaranteed timing accuracy and specified performance.
Can the AD7708BRZ-REEL7 measure both ratiometric and absolute voltage signals?
Yes, the AD7708BRZ-REEL7 supports both measurement types via its VREF Select™ feature. When using the internal reference path, it performs absolute measurements; when configured to use the transducer excitation voltage as REFIN, it enables ratiometric operation-rejecting supply variations and improving system-level accuracy.
How many analog input channels does the AD7708BRZ-REEL7 support?
The AD7708BRZ-REEL7 supports up to 10 analog input channels: eight dedicated inputs (AIN1–AIN8), one common input (AINCOM), and two multifunction pins (REFIN2+/AIN9 and REFIN2−/AIN10) that can be configured as additional analog inputs, enabling flexible channel expansion without external multiplexers.
Is the AD7708BRZ-REEL7 pin-compatible with the AD7718BRZ?
Yes, the AD7708BRZ-REEL7 is pin-for-pin compatible with the AD7718BRZ in the same SOIC-28 package. This allows seamless hardware migration from 16-bit to 24-bit resolution without PCB layout changes-only firmware and calibration updates are required to leverage the higher resolution of the AD7718BRZ.
AD7708BRZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 1.37k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Pseudo-Differential, Single Ended
- 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:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7708BRZ-REEL7 FAQ
1.How can I place an order for AD7708BRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7708BRZ-REEL7 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 AD7708BRZ-REEL7 reliable?
The price and inventory of AD7708BRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7708BRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7708BRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7708BRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7708BRZ-REEL7?
AD7708BRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7708BRZ-REEL7 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 AD7708BRZ-REEL7?
For technical support, including AD7708BRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7708BRZ-REEL7 requirements.
6.How does Aetrix verify that AD7708BRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7708BRZ-REEL7 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 AD7708BRZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7708BRZ-REEL7?
All AD7708BRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7708BRZ-REEL7, 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 AD7708BRZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7708BRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7708BRZ-REEL7 Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
