Other Parts Discussed in Thread: SN65HVD62EVM
Tool/software:
Hello Interface Team, my customer is evaluating our SN65HVD63 and are seeing a discrepancy in test results of lowest input level seem that do not match the Data Sheet Spec, which should be -15dBm.
Our Customer procured a SN65HVD62EVM locally and modified with SN65HVD63 sample. I sent them more samples of SN65HVD63 which they replaced on SN65HVD62EVM and they retested a 2nd time.
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Following is my test setup.
I use a RF attenuator (DC-6G, 50ohms. 1dB step tunable), the AISG channel 1 is set at max output level.
The power rail is 3.1V, actually I tried higher voltage, no difference.
TX input is a square wave, 50% duty cycle, 115.2KHz, 38.4KHz and 9.6KHz.
Checking the TX out at channel 2.
Got following test results
|
|
Vendor |
Max Out with the load 50 ohms (dBm) |
Max Attenuate (dB) |
Lowest Input Level (dBm) |
|||||
|
115.2KHz |
38.4KHz |
9.6KHz |
115.2KHz |
38.4KHz |
9.6KHz |
||||
|
Local Market |
SN65HVD63 |
TI |
6 |
16 |
18 |
18 |
-10 |
-12 |
-12 |
|
TI directly |
SN65HVD63 |
TI |
6 |
17 |
19 |
19 |
-11 |
-13 |
-13 |
The test results of lowest input level seem not match that in Spec, which should be -15dBm.
Need your support to find out the reason and do the improvement.
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Any help in diagnosing the discrepancy is appreciated.
