MAX1464 Datasheet, PDF (31/47 Pages) Maxim Integrated Products – Low-Power, Low-Noise Multichannel Sensor Signal Processor

Low-Power, Low-Noise Multichannel
Sensor Signal Processor
Table 7. Single-Ended (SE[3:0])
SE[3:0]
0001
0010
0011
0100
0101
0110
PGA
RANGE (V/V)
0.99
0.99 to 244
0.99 to 244
0.7*
0.7*
0.7*
ADC
+INPUT
VBG
OUTnSM
OUTnLG
V_DD**
V_SS
DACn_OUT using
OUTnSM
ADC
-INPUT
V_SS
V_SS
V_SS
V_SS
V_SS
V_SS
DESCRIPTION
Bandgap voltage.
Output of small op-amp n.
Output of large op-amp n.
Power-supply voltage.
Power-supply ground.
DACn output through small op-amp n configured
as unity-gain buffer.
0111
0.7*
DACn_OUT using
OUTnLG
V_SS
DACn output through large op-amp n configured
as unity-gain buffer.
1000
0.99 to 244
INPn
V_SS
Single-ended input on INPn.
1001
0.99 to 244
INMn
V_SS
Single-ended input on INMn.
*The PGA operates at a fixed reduced gain of 0.7V/V to enable conversion of input signals at and near V_DD and V_SS. This gain set-
ting is not selectable.
**When measuring V_DD, use the external reference or the 4 x V_BG setting.
Table 8. ADC_Config_1A (Address = 02h)
BIT
15–11
10–8
7
6–4
3
2–0
NAME
PGA1[4:0]
CLK1[2:0]
—
RES1[2:0]
CO1[3]
CO1[2:0]
DESCRIPTION
Programmable-gain amplifier setting to use during conversion of channel 1. PGA1[4] = MSB.
ADC clock setting to use during conversion of channel 1. CLK1[2] = MSB.
Unused.
ADC resolution setting to use during conversion of channel 1. RES1[2] = MSB.
Coarse-offset sign bit.
Coarse-offset DAC setting to use during conversion of channel 1. CO1[2] = MSB.
Table 9. ADC_Config_1B (Address = 03h)
BIT
15–7
6–4
3–2
1–0
NAME
—
BIAS1[2:0]
—
REF1[1:0]
DESCRIPTION
Unused.
ADC bias setting to use during conversion of channel 1. BIAS1[2] = MSB.
Unused.
Reference select for conversion on channel 1. REF1[1] = MSB.
Table 10. ADC_Config_2A (Address = 05h)
BIT
15–11
10–8
7
6
3
2–0
NAME
PGA2[4:0]
CLK2[2:0]
—
RES2[2:0]
CO2[3]
CO2[2:0]
DESCRIPTION
Programmable-gain amplifier to use during conversion of channel 2. PGA[4] = MSB.
ADC clock setting to use during conversion of channel 2. CLK2[2] = MSB.
Unused.
ADC resolution setting to use during conversion of channel 2. RES2[2] = MSB.
Coarse-offset DAC sign bit.
Coarse-offset DAC setting to use during conversion of channel 2. CO2[2] = MSB.
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