參數(shù)資料
型號(hào)： THS0842EVM
廠商： Texas Instruments, Inc.
英文描述： THS0842EVM(THS0842評(píng)估板)
中文描述： THS0842EVM（THS0842評(píng)估板）
文件頁(yè)數(shù)： 10/37頁(yè)
文件大?。?/td> 516K
代理商： THS0842EVM
THS0842 EVM Operational Procedure
1-4
1.4
THS0842 EVM Operational Procedure
The THS0842 EVM provides a flexible means of evaluating the THS0842 in
a number of modes of operation. A basic setup procedure that can be used as
a board confidence check follows:
1)
Verify all jumper settings against the schematic jumper list in Table 1–1:
Table 1–1.Jumper List Table
Jumper
Function
Installed
Removed
Default
W1
Reserved for future use
Required
Do not use
Installed
W2
Reserved for future use
Required
Do not use
Installed
W3
Oscillator power down
Power down
Active
Installed
W4
Reference select
Internal
External
Installed
W5
THS0842 standby
Active
Power down
Installed
W6
Select clock source
Onboard
Offboard
Removed
W7
Digital bus output enable
3-state bus
Active
Removed
W8
Single/dual bus mode
Dual mode
Single mode
Installed
W9
External REFB source
1–2 onboard
2–3 offboard
1–2
W10
External REFB feed
External
Internal
Removed
W11
External REFT feed
External
Internal
Removed
W12
Q+ Input select
1–2 differential
2–3 single-ended
2–3
W13
Q– Input select
1–2 differential
2–3 single-ended
2–3
W14
I+ Input select
1–2 differential
2–3 single-ended
2–3
W15
I– Input select
1–2 differential
2–3 single-ended
2–3
W16
External REFT source
1–2 onboard
2–3 offboard
1–2
Table 1–2.Default Jumper Positions
EVM
Jumper Table (connection)
THS0842
W1, W2, W3, W4, W5, W7, W9 (1–2), W12 (2–3), W13 (2–3), W14(2–3), W15 (2–3), W16(1–2)
1)
Set both dc power supplies to read 3.3 V at the output terminals. Connect
GND of the first power supply to the AGND(J6–2) terminal on the EVM,
and GND of the other power supply to the DGND(J7–2) terminal on the
EVM. Then connect the first power supply’s 3.3-V output to the AVDD pow-
er (J6–1) terminal of the EVM, and the other power supply’s 3.3-V output
to the DVDD(J7–1) terminal of the EVM.
2)
Switch power supplies on.
3)
Set function generator number one to output a square wave at a frequency
of 80 MHz, 0-V offset, and an amplitude of 3.3 V on the 50-
output.
4)
Use a 50-
coaxial cable with BNC/SMB connectors to connect generator
number 1 to J4 (clock input).
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