Analog Devices ADuCM355 Hardware Reference Manual page 103

ADuCM355 Hardware Reference Manual
DE0RESCON, Bits[7:0] (DE0) and DE1RESCON, Bits[7:0] (DE1) Setting
0x7A
0x82
0x8A
0x1B
0x33
0x4B
0x5B
0x63
0x6B
0x73
0x7B
0x83
0x8B
0x34
0x3C
0x54
0x5C
0x64
0x6C
0x74
0x7C
0x84
0x8C
The high speed TIA common-mode voltage setting (positive input to the high speed TIA amplifier) is configurable via HSTIACON,
Bits[1:0]. The configuration options are as follows:

Internal 1.1 V reference source (same as ADCVBIAS_CAP pin voltage).

Sensor Channel 0 low power DAC output (VZERO0 pin). See Table 110 and Table 115 for details.

Sensor Channel 1 low power DAC output (VZERO1 pin). See Table 112 and Table 118 for details.
Figure 21 shows the high speed TIA connections to external pins and the programmable switch and resistor locations in this part of the
receive signal circuitry.
Tx SWITCHES
AIN0
AIN1
AIN2
AIN3/BUF_VREF1V8
T1
T2
T3
T4
T5
T6
T7
T8
TSWFULLCON
OR SWCON TO
SET Tx SWITCHES
R
DE0 LOAD03
R
DE1
LOAD05
SW AND R SW AND R
LOAD03 LOAD05
CONTROLLED BY CONTROLLED BY
DE0RESCON[7:0] DE1RESCON[7:0]
Figure 21. High Speed TIA Circuitry
Rev. B | Page 103 of 312
R and R Value (Ω)
LOAD03 LOAD05
30
30
30
50
50
50
50
50
50
50
50
50
50
100
100
100
100
100
100
100
100
100
100
TSWFULLCON
OR SWCON[15:12]
HSTIACON[1:0]
HIGH SPEED
SELECTS SOURCE
TRANSIMPEDANCE
AMPLIFIER
+
TIA_I
–
HSRTIACON[3:0]
T9 R
TIA2
HSRTIACON[12:5]
HSRTIACON[4]
T10
R
TIA2_03
DE0RESCON[7:0]
T11
R
TIA2_05
DE1RESCON[7:0]
UG-1262
R and R Value
TIA2_03 TIA2_05
40.07 kΩ
80.07 kΩ
160.07 kΩ
50 Ω
100 Ω
190 Ω
1.05 kΩ
5.05 kΩ
10.05 kΩ
20.05 kΩ
40.05 kΩ
80.05 kΩ
160.05 kΩ
50 Ω
100 Ω
200 Ω
1 kΩ
5 kΩ
10 kΩ
20 kΩ
40 kΩ
80 kΩ
160 kΩ
TIA_O
C