MAX1401 Datasheet, PDF (23/36 Pages) Maxim Integrated Products – +3V, 18-Bit, Low-Power, Multichannel, Oversampling Sigma-Delta ADC

+3V, 18-Bit, Low-Power, Multichannel,
Oversampling (Sigma-Delta) ADC
External Access to Mux Outputs
The MAX1401 provides access to the switching-net-
work output and the modulator input with the MUXOUT
and ADCIN pins. This allows the user to share a single
high-performance amplifier for additional signal condi-
tioning of all input channels.
Dynamic Input Impedance at the
Channel Selection Network
When used in unbuffered mode (BUFF = 0), the analog
inputs present a dynamic load to the driving circuitry.
The size of the sampling capacitor and the input sam-
pling frequency (Figure 5) determine the dynamic load
seen by the driving circuitry. The MAX1401 samples at a
constant rate for all gain settings. This provides a maxi-
mum time for the input to settle at a given data rate. The
dynamic load presented by the inputs varies with the
gain setting. For gains of +2V/V, +4V/V, and +8V/V, the
input sampling capacitor increases with the chosen
gain. Gains of +16V/V, +32V/V, +64V/V, and +128V/V
present the same input load as the x8 gain setting.
When designing with the MAX1401, as with any other
switched-capacitor ADC input, consider the advan-
tages and disadvantages of series input resistance. A
series resistor reduces the transient-current impulse to
the external driving amplifier. This improves the amplifi-
er phase margin and reduces the possibility of ringing.
The resistor spreads the transient-load current from the
R_EXT
C_EXT
R_{MUX MUXOUT}
ADCIN ^RSW
C_PIN
C_ST
C_PIN C_SAMPLE
C_C
Figure 5. Analog Input, Unbuffered Mode (BUFF = 0)
sampler over time due to the RC time constant of the
circuit. However, an improperly chosen series resis-
tance can hinder performance in fast 16-bit converters.
The settling time of the RC network can limit the speed
at which the converter can operate properly, or reduce
the settling accuracy of the sampler. In practice, this
means ensuring that the RC time constant—resulting
from the product of the driving source impedance and
the capacitance presented by both the MAX1401’s
input and any external capacitances—is sufficiently
small to allow settling to the desired accuracy. Tables
13a–13d summarize the maximum allowable series
resistance vs. external capacitance for each MAX1401
gain setting in order to ensure 16-bit performance in
unbuffered mode.
Table 13a. R_EXT, C_EXT Values for Less than 16-Bit Gain Error in Unbuffered (BUFF = 0)
Mode; 1x Modulator Sampling Frequency (MF1, MF0 = 00); X2CLK = 0; f_CLKIN = 2.4576MHz
PGA GAIN
1
2
4
8, 16, 32,
64, 128
C_EXT = 0pF
29
29
22
15
C_EXT = 50pF
14
14
12
EXTERNAL RESISTANCE, R_EXT (kΩ)
C_EXT = 100pF C_EXT = 500pF C_EXT = 1000pF
9.4
2.9
1.6
9.4
2.9
1.6
8.4
2.7
1.5
C_EXT = 5000pF
0.43
0.43
0.40
9.6
7.0
2.4
1.4
0.37
Table 13b. R_EXT, C_EXT Values for Less than 16-Bit Gain Error in Unbuffered (BUFF = 0)
Mode; 2x Modulator Sampling Frequency (MF1, MF0 = 00); X2CLK = 0; f_CLKIN = 2.4576MHz
PGA GAIN
1
C_EXT = 0pF
14
C_EXT = 50pF
6.9
EXTERNAL RESISTANCE, R_EXT (kΩ)
C_EXT = 100pF C_EXT = 500pF C_EXT = 1000pF
4.7
1.4
0.81
C_EXT = 5000pF
0.22
2
14
6.9
4.7
1.4
0.81
0.22
4
11
6.0
4.2
1.3
0.76
0.20
8, 16, 32,
64, 128
7.7
4.8
3.5
1.2
0.70
0.18
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