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參數(shù)資料
| 型號： | BT457KG125 |
| 英文描述： | Video DAC with Color Palette (RAMDAC) |
| 中文描述： | 視頻DAC的調(diào)色板（的RAMDAC） |
| 文件頁數(shù)： | 52/60頁 |
| 文件大?。?/td> | 647K |
| 代理商： | BT457KG125 |
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5.0 Parametric Information
Bt457/Bt458
5.2 AC Electrical Parameters
125 MHz/135 MHz/165 MHz Monolithic CMOS 256 Color Palette RAMDAC
5-10
Conexant
L45801 Rev. N
VAA Supply Current
(3)
IAA
—
—
—
—
Bt458
—
—
200
285
mA
Bt457
—
—
170
220
mA
NOTE(S):
(1)
Clock and data feedthrough is a function of the number of edge rates and the amount of overshoot and undershoot on the
digital inputs. For this test, the TTL digital inputs have a 1 k
resistor to GND and are driven by 74HC logic. Settling time does
not include clock and data feedthrough. Glitch impulse includes clock and data feedthrough, and
–
3 dB test bandwidth = 2x
clock rate.
(2)
Does not apply to the Bt457.
(3)
At Fmax. IAA (typ) at VAA = 5.0 V and TA = 20
°
C. IAA (max) at VAA = 5.25 V and TA = 0
°
C.
4. Test conditions (unless otherwise specified): "Recommended Operating Conditions" with RSET = 523
and VREF = 1.235 V.
TTL input values are 0
–
3 V with input rise/fall times
≤
4 ns, measured between the 10% and 90% points. ECL input values are
VAA
–
0.8 to VAA
–
1.8 V with input rise/fall times
≤
2 ns, measured between the 20% and 80% points. Timing reference points
at 50% for inputs and outputs. Analog output load
≤
10 pF and D[7:0] output load
≤
75 pF. See timing notes in
Figure 5-1
. As
the above parameters are guaranteed over the full temperature range, temperature coefficients are not specified or required.
Typical values are based on nominal temperature, i.e., room temperature, and nominal voltage, i.e., 5 V.
Table 5-6. AC Characteristics for 80 MHz Device
(2 of 2)
80 MHz Devices
Parameter
Symbol
Min
Typ
Max
Units
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