Analog Devices Inc. AD7705BRZ
| Parameters | |
|---|---|
| Series | - |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 16-SOIC (0.295", 7.50mm Width) |
| Mfr | Analog Devices Inc. |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 85°C |
| Input Type | Differential |
| Configuration | MUX-PGA-ADC |
| Supplier Device Package | 16-SOIC |
| Number of Inputs | 2 |
| Number of Bits | 16 |
| Number of A/D Converters | 1 |
| Architecture | Sigma-Delta |
| Reference Type | External |
| Data Interface | SPI, DSP |
| Sampling Rate (Per Second) | 500 |
| Voltage - Supply, Analog | 2.7V ~ 3.3V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.3V, 5V |
| Ratio - S/H:ADC | - |
| Features | PGA |
| Package | Tube |
| Product Status | Active |
| Base Product Number | AD7705 |
| REACH Status | REACH Unaffected |
| Standard Package | 47 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
AD7705BRZ - 16-Bit, Low-Power, Dual-Channel Sigma-Delta ADC
The AD7705BRZ from Analog Devices is a 16-bit, low-power, sigma-delta (Σ-Δ) analog-to-digital converter (ADC) designed for precision measurement in low-frequency signal acquisition applications. It features two fully differential input channels, an integrated programmable gain amplifier (PGA) with gains from 1 to 128, and a 3-wire SPI-compatible serial interface, making it ideal for battery-powered, industrial, and sensor-based systems. Operating from 2.7V to 5.25V, it consumes only 1 mW at 3V, with a standby current as low as 8 µA, ensuring energy efficiency in portable and loop-powered designs. The device supports 500 samples per second (SPS) and provides excellent noise performance with 116 dB SNR, making it suitable for high-accuracy DC and low-frequency AC measurements in harsh environments.
Key Features & Specifications
The AD7705BRZ offers 16-bit resolution with no missing codes, ensuring high precision in signal conversion. It includes on-chip calibration (self-calibration and system calibration) to eliminate offset and gain errors. The differential reference inputs allow for ratiometric measurements, enhancing flexibility in sensor interfacing. The ADC operates over a wide temperature range (-40°C to +85°C) and is available in a 16-lead SOIC package, ensuring robust performance in industrial applications.
Applications & Use Cases
The AD7705BRZ is widely used in industrial control systems, medical instrumentation, smart transmitters, and portable data loggers. Its low noise and high accuracy make it ideal for:
● Strain gauge and pressure sensor interfacing
● Temperature measurement (RTDs, thermocouples)
● Battery-powered devices requiring minimal power consumption
● Process control and automation where stable, drift-free measurements are critical
● Weigh scales and precision instrumentation requiring high-resolution ADCs.
Alternative Models
For design flexibility or sourcing alternatives, the following ADCs can substitute the AD7705BRZ:
1. AD7705BRUZ – Identical specs, TSSOP-16 package for space-constrained designs.
2. AD7705BRZ-REEL/REEL7 – Same functionality, tape-and-reel packaging for automated assembly.
3. MX7705EUE+T (Maxim Integrated) – 16-bit, 2-channel Σ-Δ ADC, similar performance but different packaging (TSSOP-16).
4. MS7705 (RuiMon) – Domestic alternative, 16-bit resolution, SOP-16/DIP-16, lower cost but slightly higher standby current (20 µA).
5. AD7706BRZ – 3 pseudo-differential channels (vs. 2 fully differential in AD7705), otherwise similar specs.
