VGA DAC Characteristics
© 2008 Advanced Micro Devices, Inc.
41978 AMD RS690M Databook 3.06
Proprietary
2-13
2.5
VGA DAC Characteristics
Notes
:
1 Tested over the operating temperature range at nominal supply voltage, with an Iref of -1.50mA (Iref is the level of the current flowing
out of the RSET resistor).
2 Tested over the operating temperature range at reduced supply voltage, with an Iref of -1.50mA (Iref is the level of the current flowing
out of the RSET resistor).
3 Full scale error from the value predicted by the design equations.
4 About the mid-point of the distribution of the three DACs measured at full scale deflection.
5 Linearity measured from the best fit line through the DAC characteristics. Monotonicity guaranteed.
6 Load = 37.5
Ω
+ 20pF with Iref = -1.50 mA (Iref is the current flowing out of the RSET resistor).
7 Measured from the end of the overshoot to the point where the amplitude of the video ringing is down to +/-5% of the final steady state
value.
8 This parameter is sampled, not 100% tested.
9 Monotonicity is guaranteed.
10 Levels are 7.8% higher with setup pedestal enabled.
2.6
External Clock Chip
On the RS690M platform, an external clock chip provides the reference clock to the CPU (for generating the CPU internal
clocks) and a reference clock to the RS690M (for generating the HyperTransport, PCI Express, and A-Link Express II
clocks). For more information about supported clock chips, please consult your AMD CSS representative.
Table 2-8 VGA DAC Characteristics
Parameter
Min
Typ
Max
Notes
Resolution
10 bits
-
-
1
Maximum PS/2 setting Output Voltage
-
0.7V
-
1, 10
Maximum PS/2 setting Output Current
-
18.7mA
-
1, 10
Full Scale Error
+8% / -3%
-
+10%
2, 3
DAC to DAC Correlation
-2%
-
+2%
1, 4
Differential Linearity
-2 LSB
-
+2 LSB
1, 5
Integral Linearity
-2 LSB
-
+2 LSB
1, 5
Rise Time (10% to 90%)
0.58ns
-
1.7ns
1, 6
Full Scale Settling Time
-
TBA
-
1, 7, 8
Glitch Energy
-
TBA
-
1, 8
Monotonicity
-
-
-
9
