Rainbow Electronics MAX1464 - Manual (Page 31)

MAX1464
Low-Power, Low-Noise Multichannel
Sensor Signal Processor
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SE[3:0]
PGA
RANGE (V/V)
ADC
+INPUT
ADC
-INPUT
DESCRIPTION
0001 0.99 VBG V SS Bandgap voltage.
0010 0.99 to 244 OUTnSM V SS Output of small op-amp n.
0011 0.99 to 244 OUTnLG V
SS
Output of large op-amp n.
0100 0.7* V DD ** V SS Power-supply voltage.
0101 0.7* V SS V SS Power-supply ground.
0110 0.7*
DACn_OUT using
OUTnSM
V SS
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.
Table 7. Single-Ended (SE[3:0])
*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.
BIT NAME DESCRIPTION
15–11 PGA1[4:0] Programmable-gain amplifier setting to use during conversion of channel 1. PGA1[4] = MSB.
10–8 CLK1[2:0] ADC clock setting to use during conversion of channel 1. CLK1[2] = MSB.
7 — Unused.
6–4 RES1[2:0] ADC resolution setting to use during conversion of channel 1. RES1[2] = MSB.
3 CO1[3] Coarse-offset sign bit.
2–0 CO1[2:0] Coarse-offset DAC setting to use during conversion of channel 1. CO1[2] = MSB.
Table 8. ADC_Config_1A (Address = 02h)
BIT NAME DESCRIPTION
15–7 — Unused.
6–4 BIAS1[2:0] ADC bias setting to use during conversion of channel 1. BIAS1[2] = MSB.
3–2 — Unused.
1–0 REF1[1:0] Reference select for conversion on channel 1. REF1[1] = MSB.
Table 9. ADC_Config_1B (Address = 03h)
BIT NAME DESCRIPTION
15–11 PGA2[4:0] Programmable-gain amplifier to use during conversion of channel 2. PGA[4] = MSB.
10–8 CLK2[2:0] ADC clock setting to use during conversion of channel 2. CLK2[2] = MSB.
7 — Unused.
6 RES2[2:0] ADC resolution setting to use during conversion of channel 2. RES2[2] = MSB.
3 CO2[3] Coarse-offset DAC sign bit.
2–0 CO2[2:0] Coarse-offset DAC setting to use during conversion of channel 2. CO2[2] = MSB.
Table 10. ADC_Config_2A (Address = 05h)