MAX11410 Datasheet, PDF (47/95 Pages) Maxim Integrated Products – 24-Bit Multi-Channel Low-Power

MAX11410
24-Bit Multi-Channel Low-Power
1.9ksps Delta-Sigma ADC with PGA
SOURCE (0x0A)
The SOURCE register configures the excitation current sources, burnout current sources, and bias voltage source.
The V_BIAS Mode Control field (VBIAS_MODE) selects the operating mode for the AV_DD/2 bias voltage source. The bias
voltage may be supplied by an amplifier (Active mode) or by a resistive divider (either 125kΩ or 20kΩ source resistance).
The Burnout Current Source Select field (BRN_MODE) selects the nominal current value for the burnout detection
current source and sink. Three current values are available.
The Matched Current Source (IDAC_MODE) field selects the nominal current output for the two matched excitation
current sources.
Note that simultaneously enabling the IDAC and VBIAS sources on the same analog input is not supported. Enabling
V_BIAS on an analog input with an IDAC enabled will clear the corresponding IDAC enable. Enabling an IDAC on an
analog input with V_BIAS enabled will clear the corresponding V_BIAS enable.
BIT
7
6
5
4
3
2
1
0
Field
VBIAS_MODE[1:0]
BRN_MODE[1:0]
IDAC_MODE[3:0]
Reset
Access Type
Write, Read
Write, Read
Write, Read
BITFIELD
VBIAS_
MODE
BITS
7:6
BRN_MODE
5:4
DESCRIPTION
DECODE
00: Active mode (default)
01: High impedance; 125kΩ output impedance
10: Low impedance; 20kΩ output impedance
11: Low impedance; 20kΩ output impedance
00: Powered down, burnout sources disabled
(default)
01: 0.5μA burnout current sources enabled
10: 1μA burnout current sources enabled
11: 10μA burnout current sources enabled
IDAC_MODE
3:0
0000: 10μA (default)
0001: 50μA
0010: 75μA
0011: 100μA
0100: 125μA
0101: 150μA
0110: 175μA
0111: 200μA
1000: 225μA
1001: 250μA
1010: 300μA
1011: 400μA
1100: 600μA
1101: 800μA
1110: 1200μA
1111: 1600μA
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