參數資料
型號: THS1230EVM
廠商: Texas Instruments, Inc.
英文描述: THS1230EVM(THS1230評估板)
中文描述: THS1230EVM(THS1230評估板)
文件頁數: 18/30頁
文件大?。?/td> 427K
代理商: THS1230EVM
Analog Inputs
3-2
3.1
Analog Inputs
The ADC has either transformer-coupled input from a single-ended source,
true differential analog inputs, or a single-ended input. These inputs are
provided via SMA connectors J6 and J7 on the EVM, and can be configured
in three ways as discussed in the following sections.
3.1.1
Differential Interface
For true differential input, the positive differential signal is connected to J6 and
the negative differential signal is connected to J7. The jumper links on the
board are then configured as follows: LNK6(1–2), LNK7(1–2), LNK8(2–3). The
inputs have 50-
terminators.
3.1.2
Single-Ended Transformer-Coupled Interface
For transformer-coupled ADC input using a single-ended source, a positive
signal is applied to connector J6. The jumper links on the board are then
configured as follows: LNK6(2–3), LNK7(2–3), LNK8(1–2). Transformer
T1
performs the single-ended to differential signal conversion. In this mode, the
50-
terminators R4 and R5 perform impedance matching to give the best
distortion performance; but with the penalty that the source producing the input
signal must be able to drive the 25-
load. A 50-
source can be used if R5
is removed from the board, with a resulting marginal increase in distortion.
3.1.3
Single-Ended Interface
For single-ended input, a positive signal is applied to connector J6. The jumper
links on the board are then configured as follows: LNK6(1–2), LNK7(1–2),
LNK8(2–3).
3.2
Digital Inputs
The THS1215/30 EVM utilizes jumpers for all digital inputs, with the exception
of the clock. There are no connectors for setting the digital inputs. Refer to
jumper Tables 1–1 and 1–2 in Chapter 1 for a description of the jumpers and
their functions.
3.2.1
Internal Clock
The EVM provides flexibility as to the source of the ADC conversion clock.This
clock can come from an external signal generator, as described in Section
3.2.2, or by enabling the onboard oscillator X1. Installing jumper LNK45 in pins
1-2 and LNK44 in pins 1-2, will direct clock oscillations from oscillator X1 to
buffer U12. The EVM is shipped with external clock selected, LNK45 in pins
2-3, and LNK44 in pins 1-2.
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