Rainbow Electronics MAX1402 - Manual (Page 6)

MAX1402
+5V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
6 _______________________________________________________________________________________
Note 1: Nominal gain is 0.98. This ensures a full-scale input voltage may be applied to the part under all conditions without caus-
ing saturation of the digital output data.
Note 2: Positive Full-Scale Error includes zero-scale errors (unipolar offset error or bipolar zero error) and applies to both unipolar
and bipolar input ranges. This error does not include the nominal gain of 0.98.
Note 3: Full-Scale Drift includes zero-scale drift (unipolar offset drift or bipolar zero drift) and applies to both unipolar and bipolar
input ranges.
Note 4: Gain Error does not include zero-scale errors. It is calculated as (full-scale error - unipolar offset error) for unipolar ranges
and as (full-scale error - bipolar zero error) for bipolar ranges. This error does not include the nominal gain of 0.98.
Note 5: Gain-Error Drift does not include unipolar offset drift or bipolar zero drift. It is effectively the drift of the part if zero-scale
error is removed.
Note 6: Use of the offset DAC does not imply that any input may be taken below AGND.
Note 7: Additional noise added by the offset DAC is dependent on the filter cutoff, gain, and DAC setting. No noise is added for a
DAC code of 0000.
Note 8: Guaranteed by design or characterization; not production tested.
Note 9: The absolute input voltage must be within the input-voltage range specification.
Note 10: All AIN and REFIN pins have identical input structures. Leakage is production tested only for the AIN3, AIN4, AIN5,
CALGAIN and CALOFF inputs.
Note 11: The dynamic load presented by the MAX1402 analog inputs for each gain setting is discussed in detail in the Switching
Network Section . Values are provided for the maximum allowable external series resistance.
2.4576MHz
1.024MHz
Buffers off
Buffers off
Buffers on
2.4576MHz
1.024MHz
2.43 3.6
Buffers off
Buffers off
Buffers on
Normal mode,
MF1 = 0,
MF0 = 0
4.23 5.75
2.43 3.75
Buffers on 3.7
Buffers on
2X mode,
MF1 = 0,
MF0 = 1
7.4 10
CONDITIONS
3.5 5.25
1.88
2.4576MHz
1.024MHz
Buffers off
Buffers off
Buffers on
2.4576MHz
1.024MHz
6.85
Buffers off
Buffers off
Buffers on
4X mode,
MF1 = 1,
MF0 = 0
25.8 33
10.8 14
Buffers on 25.2
Buffers on
8X mode,
MF1 = 1,
MF0 = 1
mW
26.7 34
PD Power Dissipation
11.7 15
10.2
2.95
(Note 18) 10 100 µW Standby Power Dissipation
1.45 2.55
UNITS MIN TYP MAX SYMBOL PARAMETER
ELECTRICAL CHARACTERISTICS (continued)
(V+ = +5V ±5%, V DD = +2.7V to +5.25V, V REFIN+ = +2.50V, REFIN- = AGND, f CLKIN = 2.4576MHz, T A = T MIN to T MAX , unless other-
wise noted. Typical values are at T A = +25°C.)
4X mode,
MF1 = 1, MF0 = 0
mA
0.17
I DD 5V Digital Supply Current
1.024MHz
2.4576MHz 0.36 0.6
8X mode,
MF1 = 1, MF0 = 1 0.24 1.024MHz
2.4576MHz 0.53 0.8
5V POWER DISSIPATION (V+ = V DD = +5V, digital inputs = 0 or V DD , external CLKIN, burn-out and auxiliary currents disabled,
X2CLK = 0, CLK = 0 for 1.024MHz, CLK = 1 for 2.4576MHz.)