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0JA01D

更新时间： 2022-06-07 08:06:16
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德州仪器 - TI /
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描述
The following sections describe the function of individual circuits.

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0JA01D 数据手册

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Circuit Description  
2
Circuit Description  
2.1 Schematic Diagram  
The schematic diagram for the EVM is in Section 6.3.  
2.2 Circuit Function  
The following sections describe the function of individual circuits. Refer to the relevant data sheet for  
device operating characteristics.  
2.2.1  
Power  
Power is supplied to the EVM via banana jack sockets. By default, the EVM is configured to use a power  
management solution to supply the ADC and analog and digital power supplies, allowing users to power  
the board with a single 5-V power supply. The ADC power management solution is based on TI's  
TPS77533 and TPS73218, which supply 3.3 V and 1.8 V, respectively. In addition, the EVM offers the  
capability to supply to the ADC independent 3.3-V analog and 1.8-V digital supplies. The circuit board  
uses only one ground plane, and the heat slug is tied to ground with multiple vias to provide for thermal  
dissipation. Table 2 offers a snapshot of the power-supply options.  
Table 2. EVM Power-Supply Options  
EVM Banana Jack  
DESCRIPTION  
Auxiliary circuit 5-V digital supply: PECL driver and USB circuitry  
Single ground plane  
J1  
J2  
J4  
J5  
ADS528x 3.3-V analog supply (only active when JP8 = 2–3)  
ADS528x 1.8-V digital supply (only active when JP9 = 2–3)  
2.2.2  
Clock Input  
A single-ended square or sinusoidal clock input should be applied to J26. The clock frequency should not  
exceed the maximum speed rating found in the data sheet. Several different clocking options exist to allow  
flexible evaluation of the ADC.  
In the default case, a single-ended clock is converted to a differential clock using a Mini-Circuits TC1-1T  
transformer. When using this option, the ADC should be configured in differential clock mode by writing  
0x8001 to ADC register address 0x42. By default, after a software reset this option is asserted to coincide  
with the EVM default.  
A second EVM option allows the ADC to be configured in single-ended mode. This is provided to the ADC  
using an On Semiconductor™ MC100EPT21 amplifier, which provides for sine-wave to square-wave  
conversion. This configuration can be used for both ADS528X and ADS527X devices. To use this mode,  
use the surface-mount jumpers JP3, JP4, and JP5, and configure each one of them to have positions 2–3  
shorted.  
2.2.3  
External References  
The EVM offers the ability to force external references to the ADC. By default, the ADC is configured to  
use the references generated internal to the ADC. To force the ADC to use external references, users  
must short JP2 pads 2–3, which in turn grounds the INT/EXT pin of the ADC. Users can then use J6 pin 1  
to force a REFB and pin 3 to force a REFT voltage. GND should be connected to J6 pin 2.  
8
SLAU205–January 2008  
Submit Documentation Feedback  
 
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