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Analog Devices Inc. AD7707BRZ
- Part No.:
- AD7707BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7707BRZ.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,086
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Product details
Overview
AD7707BRZ from Analog Devices is a 3-channel, 16-bit sigma-delta ADC with ±10 V high-level and ±10 mV low-level input capability, ±0.003% integral nonlinearity, 1 mW power dissipation at 3 V, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface - used in precision industrial data acquisition systems for transducer signal conditioning.
For engineers reviewing the AD7707BRZ datasheet, AD7707BRZ pinout, AD7707BRZ application, or AD7707BRZ equivalent, key selection considerations include its dual-range analog input architecture (±10 V AIN3 + ±10 mV AIN1/AIN2), programmable gain (1–128), on-chip self- and system calibration, true bipolar ±100 mV support without charge pumps, and SOIC/TSSOP package compatibility.
Technical Context
The AD7707BRZ employs a charge-balancing sigma-delta modulator with on-chip digital filtering whose first notch is software-programmable to adjust cutoff frequency and output update rate. It integrates a programmable-gain amplifier (PGA) front end and supports unipolar/bipolar operation per channel via B/U bit configuration.
Analog inputs are isolated by dedicated common-mode references: LCOM for low-level channels (AIN1/AIN2) and HICOM for high-level AIN3. The device uses separate AVDD/DVDD supplies (2.7–3.3 V or 4.75–5.25 V), features Schmitt-triggered SCLK, and includes internal biasing (VBIAS = REFIN(+)) to eliminate external charge-pump requirements for ±10 V input handling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16 bits, no missing codes - guarantees monotonicity and full code coverage across all operating conditions. |
| Input Ranges | AIN1/AIN2: ±10 mV to ±2.5 V (5 V supply) or ±10 mV to ±1.225 V (3 V supply); AIN3: ±10 V, ±5 V, 0–10 V, 0–5 V - enables direct connection of strain gauges and industrial sensors without external level-shifting. |
| Integral Nonlinearity | ±0.003% FSR max - ensures high-accuracy measurement in precision weighing and process control applications. |
| Power Dissipation | 1.05 mW max at 3 V, 1 MHz MCLK - supports battery-powered or thermally constrained embedded systems. |
| Gain Range | Programmable 1× to 128× - allows single-device adaptation to microvolt-level transducer outputs and volt-level signals. |
| Digital Interface | 3-wire SPI/QSPI/MICROWIRE/DSP-compatible - simplifies integration with microcontrollers and DSPs using minimal GPIO resources. |
| Calibration | On-chip self-calibration and system calibration - eliminates zero-scale and full-scale errors without external equipment. |
Pinout & Package
AD7707BRZ is available in a 20-lead SOIC (wide-body, 0.3 inch) package. Pin functions are validated per Analog Devices AD7707 Rev. B datasheet (pages 10–11).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AVDD | Analog Power Supply | 2.7–3.3 V or 4.75–5.25 V analog supply; powers PGA, modulator, and reference circuitry. |
| DVDD | Digital Power Supply | 2.7–5.25 V digital supply; powers serial interface and logic; may be tied to AVDD if noise isolation not required. |
| AGND / DGND | Analog / Digital Ground | Separate ground pins require star-point connection to minimize digital switching noise coupling into analog path. |
| AIN1 / AIN2 | Low-Level Analog Inputs | Pseudo-differential inputs referenced to LCOM; accept ±10 mV to ±2.5 V (5 V) or ±10 mV to ±1.225 V (3 V) signals directly from transducers. |
| AIN3 | High-Level Analog Input | Single-ended input referenced to HICOM; accepts ±10 V signals without external attenuators or split supplies. |
| REF IN(+) / REF IN(−) | Reference Voltage Inputs | Differential reference input (1.225 V or 2.5 V) sets full-scale range; determines input span resolution and accuracy. |
| LOCOM / HICOM | Low/High-Level Common-Mode References | Independent common-mode return paths for AIN1/AIN2 and AIN3; enable true bipolar operation and reject common-mode interference separately. |
| VBIAS | Internal Bias Voltage | Internally tied to REFIN(+); eliminates need for external bias network when buffering low-level inputs. |
| CS / SCLK / DIN / DOUT | Serial Interface Signals | 3-wire SPI-compatible interface; SCLK has Schmitt trigger for noise immunity; DRDY indicates data ready status. |
| DRDY | Data Ready Output | Open-drain output pulses low when conversion result is available; synchronizes host read operations without polling. |
| RESET | Hardware Reset Input | Active-low asynchronous reset; initializes registers and clears calibration memory; requires ≥100 ns pulse width. |
| MCLK IN / MCLK OUT | Master Clock I/O | Accepts external crystal (2.4576 MHz typical) or CMOS clock; MCLK OUT can drive slave devices in daisy-chain configurations. |
| BUF | Input Buffer Enable | Configured via setup register; when enabled, buffers AIN1/AIN2 to reduce source impedance sensitivity and improve CMR. |
| NC | No Connect | Pins 11, 12, 19 - internally unused; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Charge-balancing sigma-delta architecture | Delivers 16-bit no-missing-codes performance with inherent linearity and excellent 50/60 Hz rejection (≥98 dB normal-mode, ≥150 dB common-mode). |
| True bipolar ±100 mV on low-level inputs | Enables direct connection of bridge-based sensors (e.g., load cells) without external op-amp level-shifting or charge-pump circuitry. |
| On-chip thin-film resistor network for AIN3 | Supports ±10 V input directly - eliminates external attenuator resistors, reduces board space, and avoids tempco-induced gain drift. |
| Software-configurable digital filter notch | Allows dynamic adjustment of output update rate and noise rejection profile (e.g., 10 Hz, 25 Hz, 50 Hz, 60 Hz) to match application-specific interference sources. |
| Self- and system calibration modes | Removes offset and gain errors at device or system level - eliminates manual trimming and improves long-term stability over temperature (±0.5 μV/°C offset drift typical). |
| Low-power standby mode | Reduces current to 8 μA max (3 V) or 18 μA max (5 V), enabling rapid wake-up while preserving calibration state for fast reacquisition. |
Applications
| Pressure Measurement | Thermocouple Measurement |
|---|---|
Use Scenario: High-accuracy pressure transducers output low-level mV signals requiring amplification, filtering, and digitization in HVAC or industrial process control. IC Role / Device Role / Timing Role: AD7707BRZ acts as the complete analog front end - performing PGA gain scaling, sigma-delta conversion, digital filtering, and SPI-output formatting. Use Value: Its ±10 mV low-level input range and ±0.003% INL ensure sub-0.01% pressure reading accuracy; on-chip calibration removes sensor offset drift over temperature. | Use Scenario: Type K/J thermocouples produce microvolt-level outputs with cold-junction compensation requirements in furnace monitoring or lab instrumentation. IC Role / Device Role / Timing Role: AD7707BRZ digitizes thermocouple voltage while rejecting 50/60 Hz line noise via programmable digital filter notch; LCOM reference supports ratiometric cold-junction sensing. Use Value: 98 dB normal-mode 50/60 Hz rejection and 16-bit resolution enable <1°C measurement resolution without external notch filters or complex firmware averaging. |
| RTD Measurement | Smart Valve/Actuator Control |
Use Scenario: 3-wire or 4-wire Pt100 RTDs require precise excitation current, Kelvin sensing, and high-resolution delta-sigma conversion in temperature loops. IC Role / Device Role / Timing Role: AD7707BRZ interfaces with external constant-current source and measures voltage drop across RTD; its differential reference and low-noise PGA minimize self-heating errors. Use Value: ±0.003% INL and 1 nA input bias current prevent gain/offset errors from lead resistance and excitation mismatch - critical for Class A/B RTD accuracy. | Use Scenario: Industrial smart valves use position feedback (potentiometer or LVDT) and analog setpoint inputs (0–10 V or 4–20 mA) requiring simultaneous multi-range digitization. IC Role / Device Role / Timing Role: AD7707BRZ concurrently samples valve position (low-level AIN1) and command signal (high-level AIN3), providing synchronized 16-bit data to MCU for closed-loop PID execution. Use Value: Dual-input-range architecture eliminates need for two separate ADCs; 3-wire SPI interface reduces MCU GPIO count and simplifies firmware driver development. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7714BRZ | 5-channel, 24-bit sigma-delta ADC; higher resolution but larger 28-lead SOIC; 2.7–5.25 V supply; 1.25 mW typical power at 3 V. | Targeted at higher-precision applications (e.g., laboratory instruments); lacks ±10 V direct input - requires external attenuator for high-level signals. | Select AD7714BRZ only when >16-bit resolution is mandatory and board space allows larger package; not drop-in compatible due to pin count and channel count mismatch. |
| ADS1258IPWR | 8-channel, 24-bit delta-sigma ADC; SPI interface; 2.7–5.25 V supply; 12.5 mW typical power at 5 V; integrated PGA with gains up to 64. | Designed for high-channel-count data loggers; no native ±10 V input - uses external resistor network for high-voltage ranges; higher power consumption limits battery use. | Choose ADS1258IPWR for systems needing >3 channels and 24-bit resolution; AD7707BRZ remains preferred for low-power, dual-range, 3-channel industrial sensor nodes. |
Compared with AD7714BRZ and ADS1258IPWR, the AD7707BRZ uniquely combines ±10 V and ±10 mV input ranges in one 20-pin SOIC device with sub-1 mW power - making it optimal for compact, low-power, mixed-signal industrial front ends where resolution beyond 16 bits is unnecessary.
Availability
AD7707BRZ is available at Aetrix Electronics and suitable for pressure measurement, thermocouple monitoring, RTD sensing, and smart actuator control requiring stable component supply across industrial temperature ranges (−40°C to +85°C).
Supply support for AD7707BRZ 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.
The AD7707BRZ belongs to Analog Devices' precision sigma-delta ADC product line, engineered specifically for low-frequency industrial measurement applications requiring integrated signal conditioning, multi-range input flexibility, and robust noise rejection.
FAQ
What is the maximum input voltage range supported by AD7707BRZ on its high-level input channel?
The AD7707BRZ supports a ±10 V input voltage range on its high-level analog input channel (AIN3) with respect to HICOM. This is achieved using on-chip thin-film resistors, eliminating the need for external attenuators or split supplies. The device also accommodates ±5 V, 0–10 V, and 0–5 V ranges on AIN3, all verified under specified operating conditions in the AD7707BRZ datasheet Rev. B.
Does AD7707BRZ support true bipolar operation on its low-level input channels?
Yes, the AD7707BRZ supports true bipolar operation on AIN1 and AIN2 with a minimum range of ±100 mV when configured with gain = 16 and unbuffered mode. This capability is confirmed in the "±100 mV INPUT RANGE" section of the AD7707BRZ datasheet (Rev. B, page 5), and does not require external charge-pump circuitry - a key differentiator for strain gauge and bridge sensor interfacing.
What digital interface protocols is AD7707BRZ compatible with?
The AD7707BRZ features a 3-wire serial interface fully compatible with SPI, QSPI™, MICROWIRE™, and DSP protocols. Its SCLK input includes a Schmitt trigger for enhanced noise immunity, and timing parameters (e.g., t5, t9) are specified for both 3 V and 5 V DVDD operation - ensuring reliable communication with diverse microcontrollers and digital signal processors as documented in the AD7707BRZ Rev. B timing characteristics table.
How does AD7707BRZ handle calibration for system-level accuracy?
The AD7707BRZ provides both self-calibration (removing internal offset/gain errors) and system calibration (correcting errors introduced by external components like sensors and front-end resistors). System calibration requires applying known zero- and full-scale inputs to AIN1/AIN2 or AIN3 and executing dedicated sequences via the serial interface - a process fully defined in the AD7707BRZ Rev. B Calibration Sequences section (pages 23–24).
What are the power supply requirements for AD7707BRZ?
The AD7707BRZ operates from separate analog (AVDD) and digital (DVDD) supplies: AVDD must be 2.7–3.3 V or 4.75–5.25 V for specified performance; DVDD ranges from 2.7–5.25 V. Typical power dissipation is 0.84 mW at 3 V/1 MHz (unbuffered) and 1.53 mW at 3 V/1 MHz (buffered), with standby current as low as 8 μA at 3 V - values confirmed in the AD7707BRZ Rev. B Power Requirements table (page 6).
AD7707BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500
- Number of Inputs:
- 1, 2
- Input Type:
- 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:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7707BRZ FAQ
1.How can I place an order for AD7707BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7707BRZ 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 AD7707BRZ reliable?
The price and inventory of AD7707BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7707BRZ is usually 5 days.
3.What payment methods are accepted for AD7707BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7707BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7707BRZ?
AD7707BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7707BRZ 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 AD7707BRZ?
For technical support, including AD7707BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7707BRZ requirements.
6.How does Aetrix verify that AD7707BRZ is sourced from the original manufacturer or authorized distributors?
All AD7707BRZ 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 AD7707BRZ meets industry standards.
7.What is the process for return or replacement of AD7707BRZ?
All AD7707BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7707BRZ, 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 AD7707BRZ part is unused and in its original packaging.
Return procedure for AD7707BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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