ADAQ7769-1
RECOMMENDED FOR NEW DESIGNSHigh Input Impedance, Programmable Gain, 24-Bit, 1MSPS, Alias-Free μModule® DAQ Solution
- Part Models
- 1
- 1ku List Price
- Starting From $25.30
Overview
- Highly integrated data-acquisition solution
- Wide input common-mode range
- Maximum unipolar input range of +24V or −24V
- 8 Programmable Binary Gain Options from 1V/V to 128V/V
- 3 Pin-Selectable AAF Gain Options
- G = 1V/V, 0.364V/V, 0.143V/V
- Fourth-order AAF with maximum flatness and linear phase
- Full aliasing protection with 90dB typical rejection
- Excellent device-to-device phase matching and drift
- Combined precision AC and DC performance
- Total system dynamic range up to 136dB
- -113dB typical THD at 1kHz input tone, Total Gain = 1
- 81dB typical DC CMRR at Total Gain = 1
- 1pA typical input bias current at 25°C
- ±3.3ppm typical INL
- 5ppm/°C max gain drift
- ±0.5° maximum device-to-device phase mismatch at 20kHz
- Programmable output data rate, filter type, and latency
- Linear phase digital filter options:
- Wideband low ripple FIR filter (256kSPS, 110kHz max input BW)
- Sinc5 Filter (1.024MSPS, 208.9kHz max input BW, 4uS max group delay)
- Sinc3 Filter (50/60Hz rejection)
- Integrated LDO
- Built-in supply decoupling capacitors
- Configuration through pin strapping or SPI interface
- Digital interface optimized for isolated applications
- Suite of diagnostic check mechanisms
- Operating temperature range: −40°C to +105°C
- Available in a 12.00mm × 6.00mm 84-ball CSP_BGA with a 0.80mm ball pitch package
- 11x footprint reduction versus discrete solution
The ADAQ7769-1 is a 24-bit precision data acquisition (DAQ) μModule® system that encapsulates signal conditioning, conversion, and processing blocks into one system in package (SiP) design that enables rapid development of highly compact, high performance precision DAQ systems.
The ADAQ7769-1 consists of:
- A low noise, low bias current, high bandwidth programmable gain amplifier (PGA) that can be programmed to operate at binary gains of 1 to 128
- A fourth order, low noise, linear phase anti-aliasing filter (AAF)
- A low noise, low distortion, high bandwidth, gain-selectable ADC driver plus an optional linearity boost buffer
- A high-performance medium bandwidth 24-bit sigma delta ADC with programmable digital filter
- A low noise, low dropout linear regulator
- Reference buffer
- Critical passive components required for the signal chain
The ADAQ7769-1 supports a wide range of single-ended input amplitudes, with a maximum unipolar range of 0V to +24V or 0V to −24V, or a bipolar range of ±16V, basing its flexibility on the PGA supply voltages. With eight programmable binary PGA gain settings and three pin-selectable AAF gain settings, ADAQ7769-1 offers additional system dynamic range and improved signal chain noise performance with input signals of lower amplitude. The input signal is fully buffered with very low typical input bias current of 1pA. This allows easy input impedance matching and enables the ADAQ7769-1 to directly interface to sensors with high output impedance.
A fourth-order low-pass analog filter combined with the user programmable digital filter ensures the signal chain is fully protected against the high frequency noise and out of band tones presented at the input node from aliasing back into the band of interest. The analog low pass filter is carefully designed to achieve high phase linearity and maximum in-band magnitude response flatness. Constructed with iPASSIVES™ technology, the resistor network used within the analog low-pass filter possess superior resistance matching in both absolute values and over temperature. As a result, the signal chain performance is maintained with minimum drift over temperature and the ADAQ7769-1 has a tight phase mismatch across devices.
A high-performance ADC driver amplifier ensures the full settling of the ADC input at the maximum sampling rate. The driver circuit is designed to have minimum additive noise, error, and distortion while maintaining stability. The fully differential architecture helps maximizing the signal chain dynamic range.
The analog to digital converter (ADC) inside the ADAQ7769-1 is a high performance, 24-bit precision, single channel Sigma-Delta converter with excellent AC performance and DC precision and a throughput rate of 256kSPS from a 16.384MHz MCLK. It includes an optional linearity boost buffer that can further improve the signal chain linearity.
The ADAQ7769-1 is specified with the input reference voltage of 4.096V, but the device can support reference voltages ranging from VDD_ADC down to 1 V.
The ADAQ7769-1 has two types of reference buffers. A precharge reference buffer to ease the reference input driving requirement or a full reference buffer to provide high impedance reference input. Both buffers are optional and can be turned off through register configuration.
ADAQ7769-1 supports three clock input types: crystal, CMOS or LVDS.
Three types of digital low pass filters are available on the ADAQ7769-1. The wideband low ripple FIR filter has a filter profile similar to an ideal brick wall filter, making it a great fit for doing frequency analysis. The Sinc5 filter has a low latency path with a smooth step response while maintaining a good level of aliasing rejection. It supports an output data rate up to 1.024MSPS from a 16.384MHz MCLK, making the Sinc5 filter ideal for low latency data capturing and time domain analysis. The Sinc3 filter supports a wide decimation ratio and can produce output data rate down to 50SPS from a 16.384MHz MCLK. This combined with the simultaneous 50H/60Hz rejection post filter makes Sinc3 filter especially useful for precision DC measurement. All the three digital filters on the ADAQ7769-1 are FIR filters with linear phase response. The bandwidth of the filters, which directly corresponds to the bandwidth of the DAQ signal chain are fully programmable through register configuration.
The ADAQ7769-1 supports two device configuration methods. The user has the option to choose to configure the device via register write through its SPI interface, or through a simple hardware pin strapping method to configure the device to operate under a number of pre-defined modes.
A single SPI interface supports both the register access and the sample data readback functions. The ADAQ7769-1 always acts as a SPI slave. Multiple interface modes are supported with a minimum of three IO channels required to communicate with the device.
ADAQ7769-1 features a suite of internal diagnostic functions that can detect a broad range of errors during operation to help improving the system reliability.
The ADAQ7769-1 supply connections can be greatly simplified by using its internal LDO. Note that, 0.1μF decoupling capacitors are also integrated to further reduce the number of discrete components..
On power standby, each functional block of the device can be put into standby mode. This enables the device to have a total power consumption less than TBD mW.
The ADAQ7769-1 device has an operating temperature range of −40°C to +105°C and is available in a 12 mm x 6 mm, 84-ball BGA package with 0.8mm ball pitch, making it suitable for multiple-channel applications. The footprint of the device is eleven times smaller compared to the footprint of the same solution using discrete components.
APPLICATIONS
- Universal input measurement platform
- Electrical test and measurement
- Sound and Vibration, Acoustic & Material Science research and development
- Control and Hardware in loop verification
- Condition monitoring for predictive maintenance
- Audio Test
Documentation
Data Sheet 1
User Guide 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| ADAQ7769-1BBCZ | CSP_BGA |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- ADAQ7769-1
IBIS Model 1
Signal Chain Designer
Signal Chain Designer is a web-based tool designed to create and simulate complex precision signal chains. See your circuit’s performance before you commit to your PCB: transfer function, noise, power consumption, input range, and DC error. Quickly experiment with different parts and architectures. Signal chains can be exported to LTspice for further analysis.
Open ToolLTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
Evaluating the ADAQ7769-1 High Input Impedance, Programmable Gain, Anti-Alias, 24-Bit, 1MSPS, μModule DAQ Solution
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