Texas Instruments DS80PCI402EVK 4 Channels SMA Evaluation Kit DS80PCI402EVK/NOPB DS80PCI402EVK/NOPB 데이터 시트
제품 코드
DS80PCI402EVK/NOPB
4
DS80PCI402EVK User’s Guide
October 2012
2.6. Set the output VOD and De-emphasis level
For external pin mode control for the VOD and De-emphasis level:
Set ENSMB = 0 (1kohm to GND) by using the SW2 (3-2-1) = (ON-OFF-OFF).
SW4 pin1,2 must be set to the OFF positions, so the SMBUS signals are disconnected.
Refer to Table 1 for information on the 3 switch settings for the 4 level input.
Example:
Set DEMB[1:0] with SW5 for the B bank of outputs (top 2 left outputs of DS80PCI402).
SW5 (6-5-4), (3-2-1) = (ON-OFF-OFF), (OFF-OFF-ON) = DEMB[1:0] = 0,1 (VOD=1.0V, DE=0 dB).
Set DEMA[1:0] with SW3 for the A bank of outputs (bottom 2 right outputs of DS80PCI402).
SW3 (6-5-4), (3-2-1) = (ON-OFF-OFF), (OFF-OFF-ON) = DEMA1:0] = 0,1 (VOD=1.0V, DE=0 dB).
Table 4: 16 settings of VOD and DE when in pin mode
Level
DEMA/B[1:0]
SW5 - DEMB[1:0]
SW3 - DEMA[1:0]
SW3 - DEMA[1:0]
GEN1,2
6
5
4
3
2
1
VOD (Vp-p)
DE (dB)
1
0, 0
ON
OFF
OFF
ON
OFF
OFF
0.8
0
2
0, R
ON
OFF
OFF
OFF
ON
OFF
0.9
0
3
0, F
ON
OFF
OFF
OFF
OFF
OFF
0.9
-3.5
4
0, 1
ON
OFF
OFF
OFF
OFF
ON
1.0
0
5
R, 0
OFF
ON
OFF
ON
OFF
OFF
1.0
-3.5
6
R, R
OFF
ON
OFF
OFF
ON
OFF
1.0
-6
7
R, F
OFF
ON
OFF
OFF
OFF
OFF
1.1
0
8
R ,1
OFF
ON
OFF
OFF
OFF
ON
1.1
-3.5
9
F ,0
OFF
OFF
OFF
ON
OFF
OFF
1.1
-6
10
F, R
OFF
OFF
OFF
OFF
ON
OFF
1.2
0
11
F, F
OFF
OFF
OFF
OFF
OFF
OFF
1.2
-3.5
12
F, 1
OFF
OFF
OFF
OFF
OFF
ON
1.2
-6
13
1, 0
OFF
OFF
ON
ON
OFF
OFF
1.3
0
14
1, R
OFF
OFF
ON
OFF
ON
OFF
1.3
-3.5
15
1, F
OFF
OFF
ON
OFF
OFF
OFF
1.3
-6
16
1, 1
OFF
OFF
ON
OFF
OFF
ON
1.3
-9
2.7 SMBUS mode control of the EQ, VOD and De-emphasis level:
Set ENSMB = 1 (1kohm to VIH) by using the SW2 (3-2-1) = (OFF-OFF-ON).
Set SW4 pin1,2 to the ON position so the SMBUS signals are connected.
Set SW3 pin1 thru pin6 switches to the OFF position so they do not connect to the SDA and SCL line.
Set the SW1 and SW5 for the AD[3:0] pins. AD[3:0]=0000 sets device slave address = B0’hex.
Connect SDA, SCL and GND to J17. Please refer to datasheet for register map for EQ, VOD and DEM.