參數(shù)資料
型號(hào)： THS1230EVM
廠商： Texas Instruments, Inc.
英文描述： THS1230EVM(THS1230評(píng)估板)
中文描述： THS1230EVM（THS1230評(píng)估板）
文件頁(yè)數(shù)： 9/30頁(yè)
文件大小： 427K
代理商： THS1230EVM
1-3
Digital output from the EVM is via a 40-pin connector. The digital lines from
the ADC are buffered before going to this connector. More information on this
connector can be found in the ADC output section.
Analog output from the EVM is via SMA connector J9. A THS5671A 14-bit
DAC is used to recreate the analog signal from the ADC digital data. More
information on this can be found in the ADC analog output section.
Power connections to the EVM are via 4mm banana sockets. Separate input
connectors are provided for the analog and digital supply.
In addition to the internal reference provided by the THS1215/30 device,
options are provided on the EVM to allow adjustment of the ADC reference via
an onboard reference circuit.
The reference voltages VRT and VRB for the
THS1215/30 device are supplied by an LT1004-1.2 precision shunt voltage
regulator, resistor network, TLV2464CD op amp, and two transistors. The
LT1004-1.2 has initial accuracy of 0.33 % and a temperature coefficient (TC)
of 20 ppm/
°
C, making the device a suitable voltage reference for a 12-bit ADC
operating in a temperature controlled environment. Wide-range temperature
operation requires a more precise voltage reference, such as the VRE3025.
1.3
Power Requirements
The EVM can be powered directly from a single 3.3 V supply. Provision is also
made to allow the EVM to be powered with independent 3.3 V analog and
digital supplies to provide higher performance.
Caution
Exceeding the 3.3 V maximum can damage EVM components.
Under-voltage may cause improper operation of some or all of the
EVM components.
1.4
THS1215/30 EVM Operational Procedure
The THS1215/30 EVM provides a flexible means of evaluating the
THS1215/30 in a number of modes of operation. A basic set-up procedure,
used as a board confidence check is as follows:
1)
Verify all EVM jumper settings match the jumper configuration as listed in
Tables 1-1 and 1-2.
2)
Connect 3.3-V input power to the EVM J1 and J2, and GND to J8 and J3.
3)
Switch power supplies on.
4)
Use a function generator with 50-
output impedance to provide a 10
MHz, 1.5-V offset, 3-Vp-p amplitude square wave input signal to J4.
5)
Use a function generator with 50-
output impedance to provide a
100-KHz, 0-V offset, 3-Vp-p amplitude sine wave input signal to J6.
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