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Overview
3
SBAU302–December 2017
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ADS7057 Evaluation Module
1 Overview
The ADS7057EVM-PDK evaluation kit includes the ADS7057EVM board and the precision host interface
(PHI) controller board that enables the accompanying computer software to communicate with the ADC
over USB for data capture and analysis.
The ADS7057EVM board includes the ADS7057 SAR ADC, all the peripheral analog circuits, and the
components required to achieve optimum performance from the ADC.
The PHI controller board primarily serves three functions:
• Provide a communication interface from the EVM to the computer through a USB port
• Provide the digital input and output signals necessary to communicate with the ADS7057 device
• Supply power to all active circuitry on the ADS7057EVM board
Along with the ADS7057EVM and PHI controller board, this evaluation kit includes an A-to-micro-B USB
cable to connect to a computer.
1.1 ADS7057EVM-PDK Features
The ADS7057EVM-PDK showcases the following features:
• Hardware and software required for diagnostic testing as well as accurate performance evaluation of
the ADS7057 ADC
• USB powered — no external power supply is required
• The PHI controller board that provides a convenient communication interface to the ADS7057 ADC
over USB 2.0 (or higher) for power delivery as well as digital input and output
• Easy-to-use evaluation software for Microsoft®Windows®7, 64-bit operating systems
1.2 ADS7057EVM Features
The ADS7057EVM showcases the following features:
• Onboard low-noise, low-distortion ADC input drivers optimized to meet ADC performance
• Onboard ultra-low noise, low-dropout (LDO) regulators, to generate supplies for the operation amplifier
and voltage reference to generate the power supply for ADC
2 Analog Interface
The ADS7057 is a low-power, small ADC that supports differential analog inputs. The ADS7057EVM uses
a THS4551 fully differential amplifier to drive the inputs of the ADC. The ADS7057EVM is designed for
easy interfacing to analog sources. This section describes the front-end driver circuitry details, including
jumper configurations for the analog input signal source.
2.1 Connectors for Differential Analog Input
The ADS7057EVM is designed for easy interfacing to an external, analog, differential source through
either a subminiature version A (SMA) connectors or 100-mil headers. The ADS7057EVM has two
ADS7057 ADCs on board. The ADS7057EVM GUI can either be configured for individual ADC data
sampling or simultaneous sampling with both ADCs. Jumpers J1, J2, J7, and J10 are the SMA connectors
that allow for differential analog source connectivity through coaxial cables. Alternatively, 100-mil jumper
cables or mini-grabbers can be used to connect analog sources to the pin 1 of connectors J3, J6, J8, and
J9. Table 2 lists the analog input connectors for the individual ADCs.
Table 2. Analog Input Connector Description
Pin Number Signal Description
J1 and J2 INP Differential analog input provided at the SMA for ADC A
J3:1 and J6:1 INP Alternate location to provide the differential input for ADC A
J7 and J10 INP Differential analog input provided at the SMA for ADC B
J8:1 and J9:1 INP Alternate location to provide the differential input for ADC B
