ADC08100 Datasheet, PDF (6/19 Pages) National Semiconductor (TI) – 8-Bit, 20 MSPS to 100 MSPS, 1.3 mW/MSPS A/D Converter

Converter Electrical Characteristics (Continued)
The following specifications apply for V_A = DR V_D = +3.0V_DC, V_RT = +1.9V, V_RB = 0.3V, C_L = 10 pF, f_CLK = 100 MHz at 50%
duty cycle. Boldface limits apply for T_A = T_MIN to T_MAX: all other limits T_A = 25˚C (Notes 7, 8)
Symbol
Parameter
Conditions
Typical
(Note 9)
Limits
(Note 9)
Units
(Limits)
POWER SUPPLY CHARACTERISTICS
DR I_D Output Driver Supply Current
DC Input
f_IN = 10 MHz, V_IN = FS − 3 dB
DC Input
1
2
mA (max)
8
mA (max)
42
52
I_A +
DRI_D
Total Operating Current
f_IN = 10 MHz, V_IN = FS − 3 dB,
49
PD = Low
CLK Low, PD = Hi
0.2
mA (max)
DC Input
126
156
mW (max)
PC
Power Consumption
f_IN = 10 MHz, V_IN = FS − 3 dB,
147
mW
PD = Low
CLK Low, PD = Hi
0.6
mW
FSE change with 2.7V to 3.3V change
PSRR₁ Power Supply Rejection Ratio
in V_A
54
dB
SNR change with 200 mV at 1 MHz
PSRR₂ Power Supply Rejection Ratio
on supply
TBD
dB
AC ELECTRICAL CHARACTERISTICS
f_C1
Maximum Conversion Rate
f_C2
Minimum Conversion Rate
t_CL
Minimum Clock Low Time
t_CH
Minimum Clock High Time
t_OH
Output Hold Time
t_OD
Output Delay
Pipeline Delay (Latency)
CLK Rise to Data Invalid
CLK Rise to Data Valid
125
100
MHz (min)
20
MHz
4.5
ns (min)
4.5
ns (min)
4.4
ns
5.9
8.5
ns (max)
2.5
Clock Cycles
t_AD
Sampling (Aperture) Delay
CLK Fall to Acquisition of Data
1.5
t_AJ
Aperture Jitter
2
ns
ps rms
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: All voltages are measured with respect to GND = AGND = DR GND = 0V, unless otherwise specified.
Note 3: When the input voltage at any pin exceeds the power supplies (that is, less than AGND or DR GND, or greater than V_A or DR V_D), the current at that pin
should be limited to 25 mA. The 50 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input
current of 25 mA to two.
Note 4: The absolute maximum junction temperature (T_Jmax) for this device is 150˚C. The maximum allowable power dissipation is dictated by T_Jmax, the
junction-to-ambient thermal resistance (θ_JA), and the ambient temperature (T_A), and can be calculated using the formula P_DMAX = (T_Jmax − T_A) / θ_JA. In the 24-pin
TSSOP, θ_JA is 92˚C/W, so P_DMAX = 1,358 mW at 25˚C and 435 mW at the maximum operating ambient temperature of 85˚C. Note that the power consumption of
this device under normal operation will typically be about 162 mW (126 mW quiescent power + 12 mW reference ladder power + 24 mW to drive the output bus
capacitance). The values for maximum power dissipation listed above will be reached only when the ADC08100 is operated in a severe fault condition (e.g., when
input or output pins are driven beyond the power supply voltages, or the power supply polarity is reversed). Obviously, such conditions should always be avoided.
Note 5: Human body model is 100 pF capacitor discharged through a 1.5 kΩ resistor. Machine model is 220 pF discharged through ZERO Ohms.
Note 6: See AN-450, “Surface Mounting Methods and Their Effect on Product Reliability”, or the section entitled “Surface Mount” found in any post 1986 National
Semiconductor Linear Data Book, for other methods of soldering surface mount devices.
Note 7: The analog inputs are protected as shown below. Input voltage magnitudes up to V_A + 300 mV or to 300 mV below GND will not damage this device.
However, errors in the A/D conversion can occur if the input goes above DR V_D or below GND by more than 100 mV. For example, if V_A is 2.7V_DC the full-scale input
voltage must be ≤2.6V_DC to ensure accurate conversions.
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