Texas Instruments VCA5807 Evaluation Module VCA5807EVM VCA5807EVM 데이터 시트
제품 코드
VCA5807EVM
Hardware
4.3
Power
The power configuration of the board is shown in
, page 1 of the schematic. Refer to
for
a list of important power components.
Table 2. Power Table
Connector
Description
P1/JP6
P1 is the +5-V and –5-V power supply connector. JP6 is the test point for +5-V/-5-V
power supply.
power supply.
JP3
Onboard 5-V enable. The configuration must be set up as shown in
in order to
use onboard 5-V supply.
TP-5V
-5-V supply test point
+5VA
+5-V supply test point
JP2
Onboard 3.3-VA enable. The configuration must be set up as shown in
in order
to use the onboard 3.3 V.
TP33VA
+3.3-VA supply test point
TP1 through TP4
Ground test points
4.4
Clock Buffer
The clock buffer drives the VCA5807 device. Each clock buffer output should only drive one VCA5807. Do
not use one clock to drive multiple VCA5807s. This is due to the fact that the clock buffer's load
capacitance increases by a factor of N, which then results in degraded falling and rising times. Select
different clock inputs in the GUI. LEDs 41 and 42 demonstrate the PLL status of the clock buffer.
not use one clock to drive multiple VCA5807s. This is due to the fact that the clock buffer's load
capacitance increases by a factor of N, which then results in degraded falling and rising times. Select
different clock inputs in the GUI. LEDs 41 and 42 demonstrate the PLL status of the clock buffer.
4.5
VCA Inputs
J1 through J8 are the analog input signals for CH1 through CH8. Connect to a signal generator. If the
signal is too noisy, apply a bandpass filter between the generator and the SMA to get a better result. Use
TP3-TP10 to see the input signal to the board.
signal is too noisy, apply a bandpass filter between the generator and the SMA to get a better result. Use
TP3-TP10 to see the input signal to the board.
4.6
VCA5807 Device
The VCA5807 device is a suitable ultrasound analog front end solution for high-end systems and portable
systems. This device contains eight channels of VCA, and CW mixer. The VCA includes an LNA, Voltage-
controlled Attenuator (VCAT), PGA, and an LPF. Each of these features is adjusted via the VCA5807
EVM GUI. For a more detailed explanation of the VCA5807 device please refer to the datasheet. The
datasheet is found on the TI product folder at www.ti.com. (
systems. This device contains eight channels of VCA, and CW mixer. The VCA includes an LNA, Voltage-
controlled Attenuator (VCAT), PGA, and an LPF. Each of these features is adjusted via the VCA5807
EVM GUI. For a more detailed explanation of the VCA5807 device please refer to the datasheet. The
datasheet is found on the TI product folder at www.ti.com. (
4.7
VCA Outputs
J26 through J36 are the output signals for CH1 through CH8. All channels have a single-ended output
through an OPA842 buffer amplifier. However, CH1 has the option of a fully differential output signal
through a THS4130 amplifier. In order to use this amplifier, install R734 and R738 and remove R837,
C317, and C318. CH8 also provides an added feature by allowing the choice of the OPA830 as the buffer
amplifier. In order to use this amplifier, install R776 and R777 and remove U35.
through an OPA842 buffer amplifier. However, CH1 has the option of a fully differential output signal
through a THS4130 amplifier. In order to use this amplifier, install R734 and R738 and remove R837,
C317, and C318. CH8 also provides an added feature by allowing the choice of the OPA830 as the buffer
amplifier. In order to use this amplifier, install R776 and R777 and remove U35.
13
SLOU352 – November 2012
VCA5807 Development Guide
Copyright © 2012, Texas Instruments Incorporated