Analog Devices ADuCM355 Hardware Reference Manual page 86

UG-1262
Close SW0 when changing the R
power TIA input path when using an oxygen electrochemical sensor, close the shorting switch, SW1, to protect the low power TIA input
circuitry. SW1 is controlled by LPTIASWx, Bit 1. For full details of the high speed TIA in Figure 16 and Figure 17, refer to the High Speed TIA
Circuits section.
RE0
CE0
SW3
CAP_POT0
10kΩ
RE0
SW11
SE0
SW1
RC0_0
RC0_1
SE0
SE1
value, and open SW0 again when the change is complete. If high currents are detected on the low
TIA
VBIAS0
SW12
SW15
+
OPEN: LPDACCON0[5] = 1
PA
SW2
–
SW8
SW10
10kΩ
SW4
R
LOAD
LPTIACON0
[12:10]
R
TIA
LPTIACON0
[9:5]
TSWFULLCON[4]
T5
HSTIA
TSWFULLCON[6]
T7
Figure 16. Low Power TIA, Low Power Potentiostat, and Low Power DAC Switches for Channel 0
ADuCM355
VZERO0
LPDACSW0[3]
SW13
AND LPDACSW0[4] = 0
LPDACSW0[2]
SW14
SW6
+
LPTIA
–
SW7
FORCE/SENSE
SW0
LPDACSW1[0]
ADCVBIAS_CAP (1.11V)
LPDACSW0[0]
Rev. B | Page 86 of 312
Hardware Reference Manual
VREF_2.5V
LPDACSW0[1]
ULPBUF
LPDACCON0[3]
12-BIT
LPDAC0
6-BIT ULPREF
LPDACCON0[4]
TO CHANNEL 1
LPTIA0_P_LPF0
SW5 SW9
R
LPF
LPTIACON0
[15:13]
VZERO1
VZERO0
AIN4_LPF0
ADC
MUX