Features
1-2
1.1
Features
-
Evaluation Board featuring the ADS1625 ADC (order ADS1625 EVM) or
ADS1626 (order ADS1626 EVM)
-
Onboard reference, with recommended buffer circuitry
-
Onboard signal conditioning.
-
Basic system-level logic decoding.
1.2
Introduction
The ADS1625 EVM is a high speed, high-resolution, delta sigma (
∆Σ
)
analog-to- digital converter. It features a data rate of 1.25 MSPS, a bandwidth
(−3 dB) of 615 kHz and a passband ripple of less than
±
0.0025 dB.
The evaluation module (EVM) is a stand-alone, full-featured system that offers
data sheet performance. Additionally, the EVM conforms to a common
electrical and mechanical pinout for analog I/O, digital I/O, and power,
enabling the EVM to be quickly adapted to various host platforms.
1.3
Analog Interface
The analog interface consists of the following subsections:
-
Analog input
-
External reference
-
Modulator clock
Each portion of the analog interface can be adapted to some extent. The
modifications are summarized in Table 1−1 and discussed in detail in the
appropriate subsection of this chapter.
Table 1−1. Analog Interface
Reference
Factory Set Condition
Designator
Description
1−2
2−3
Analog Input options
W1
Selects AIN_N source
Installed
Not installed
W2
Selects AIN source
Installed
Not installed
Reference voltage options
W3
Selects VREFN source
Installed
Not installed
W4
Selects VCOM source
Installed
Not installed
W5
Selects VREFP source
Installed
Not installed
W6
Connects VCM for on board reference
Installed
Modulator clock options
W7
Modulator clock source
Installed
Not installed
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