AD7606
8-channel simultaneous sampling ADC with 16-bit resolution, ±10V input range, and integrated analog front end.
Product Overview
Description
The AD7606 is a complete 8-channel data acquisition system featuring 16-bit simultaneous sampling ADCs with bipolar input ranges of ±5V and ±10V. Each channel contains analog input clamp protection, programmable gain amplifier (PGA), low-pass filter, and 16-bit SAR ADC.
The device offers high integration reducing component count and board space. The analog inputs feature ±16.5kV ESD protection and clamp circuits that can withstand input voltages up to ±16.5V, eliminating the need for external protection diodes.
With a sampling rate of up to 200kSPS on all channels, the AD7606 is ideal for power line monitoring, multiphase motor control, and industrial automation applications. The flexible digital interface supports parallel, serial, and parallel byte modes for easy connection to DSPs, FPGAs, and microcontrollers.
Product Series
AD
Primary Application
Power line monitoring and protection
Key Features
- 8-channel simultaneous sampling
- True bipolar analog inputs (±10V, ±5V)
- Integrated analog input clamp protection
- Programmable gain amplifier per channel
- Analog input impedance 1MΩ
- On-chip reference and buffer
- High-speed serial and parallel interface
- Oversampling capability up to 64x
Specifications
| Resolution | 16-bit |
|---|---|
| Channels | 8 simultaneous |
| Sampling Rate | 200kSPS per channel |
| Input Range | ±5V, ±10V (software selectable) |
| SNR | 90.8dB typical |
| THD | -100dB typical |
| Power | 140mW at 200kSPS |
| Interface | Parallel/Serial |
| Package | LQFP-64 |
| Temperature Range | -40°C to +85°C |
Applications
Power line monitoring and protection
Electronic system design
Multiphase motor control
Motor drive and control systems
Industrial automation and control
Industrial automation and control
Instrumentation and data acquisition
Data acquisition and conversion
Vibration analysis and condition monitoring
Electronic system design
FAE Expert Insights
"The AD7606 is my go-to recommendation for industrial customers needing multichannel data acquisition. The ±10V true bipolar inputs eliminate the need for external level shifting and signal conditioning - a huge cost and space savings. The integrated clamp protection has saved countless designs from overvoltage damage in harsh industrial environments. I've measured 91dB SNR in actual customer designs, matching the datasheet specs. The simultaneous sampling is critical for power monitoring where phase relationships matter. The digital interface flexibility is excellent - use parallel mode for high-speed FPGA interfaces or serial mode to save MCU pins. My only caution is the power consumption at full speed - budget 140mW and ensure adequate PCB copper for heat dissipation. The oversampling feature is a nice bonus for noise reduction. Overall, an excellent integrated solution for multichannel DAS."
Integrated ±10V bipolar inputs eliminate external conditioning; 91dB SNR matches datasheet specs
— Robert Chen, BeiLuo
Frequently Asked Questions
What is the maximum sampling rate per channel for AD7606?
The AD7606 supports up to 200kSPS sampling rate per channel when all 8 channels are active. This means the total aggregate throughput is 1.6MSPS (8 channels x 200kSPS). The sampling rate is programmable through the oversampling control pins or register settings. When using oversampling (OS), the maximum sampling rate per channel decreases: OS x2 = 100kSPS, OS x4 = 50kSPS, OS x8 = 25kSPS, up to OS x64 = 3.125kSPS. The conversion time is approximately 4μs per channel at maximum speed. For applications requiring higher sampling rates, consider the AD7606B which supports 300kSPS per channel, or the AD7606C-18 for 18-bit resolution at 200kSPS.
Use 200kSPS for maximum throughput; enable oversampling for noise reduction at lower sampling rates.
How do I configure the input voltage range on AD7606?
The AD7606 supports two software-selectable input ranges: ±5V and ±10V bipolar. The range is selected using the RANGE pin or through the configuration register. When RANGE = 0 (default), the input range is ±5V with 152.6μV/LSB. When RANGE = 1, the input range is ±10V with 305.2μV/LSB. The range can be changed dynamically between conversions. Both ranges support true bipolar inputs, meaning they can accept both positive and negative voltages. The analog inputs have high impedance (1MΩ) and can withstand overvoltage up to ±16.5V without damage thanks to integrated clamp protection. For single-ended unipolar applications, connect the negative input to ground and use the appropriate range.
Use ±10V range for wider input signals; use ±5V range for better LSB resolution with smaller signals.
What interface options are available on AD7606?
The AD7606 offers three flexible digital interface modes selectable via the PAR/SER/BYTE SEL pin: 1) Parallel interface - uses 16 data lines (D0-D15) plus control signals, fastest throughput for FPGA/DSP connections; 2) Serial interface - uses 2 data lines (DOUTA, DOUTB) with SPI-like protocol, ideal for MCU interfaces with limited pins; 3) Parallel byte interface - uses 8 data lines with two read cycles per conversion, compatible with 8-bit processors. The serial interface supports both external and internal clock modes. In serial mode, DOUTA outputs data from channels 1-4 and DOUTB outputs channels 5-8 simultaneously. The interface mode can be changed dynamically, allowing flexible system design. All modes support CS (Chip Select) and RD (Read) control signals.
Use parallel mode for maximum speed with FPGAs; use serial mode to save pins with MCUs; use byte mode for 8-bit processors.
How does the oversampling feature work on AD7606?
The AD7606 includes a digital oversampling feature that improves SNR and reduces noise by averaging multiple conversions. Oversampling ratios of x2, x4, x8, x16, x32, and x64 are selectable via OS pins or register bits. Each doubling of oversampling ratio improves SNR by approximately 3dB (0.5 bit effective resolution). For example, OS x64 can improve SNR by up to 18dB (3 bits). The trade-off is reduced sampling rate - OS x64 reduces maximum sampling rate from 200kSPS to 3.125kSPS per channel. The oversampling filter has a flat passband and steep roll-off, effectively reducing out-of-band noise. This feature is particularly useful for precision DC measurements where high resolution is more important than sampling speed. The oversampling is performed digitally inside the ADC, requiring no additional external processing.
Use oversampling for precision DC measurements; each 2x OS improves SNR by 3dB at the cost of reduced sampling rate.
What is the power consumption of AD7606 at different sampling rates?
The AD7606 power consumption scales with sampling rate due to the dynamic power of the digital interface and reference buffer. Typical power consumption at 5V supply: 140mW at 200kSPS (all 8 channels), 100mW at 100kSPS, 60mW at 50kSPS, and 25mW in standby mode. The device supports two power-saving modes: Standby mode (25mW) keeps the reference and digital logic active for fast wake-up; Shutdown mode (2.5mW) powers down all circuits. Wake-up time from standby is approximately 10μs, while wake-up from shutdown requires 13ms for reference settling. For battery-powered applications, use the shutdown mode between sampling bursts and the standby mode when periodic sampling is required. The analog power (AVcc) and digital power (DVcc) can be supplied separately, allowing DVcc to be powered at 3.3V while AVcc uses 5V.
Use shutdown mode for minimum power between bursts; use standby mode for faster wake-up in periodic sampling applications.