Using De0 And De1 Inputs With The High-Speed Tia - Analog Devices ADuCM356 Reference Manual

Reference Manual
HIGH-SPEED TIA CIRCUITS
Table 120. Configuration of R
LOAD
DE0RESCON, Bits[7:0] (DE0) and DE1RESCON, Bits[7:0] (DE1) Setting
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.
USING DE0 AND DE1 INPUTS WITH THE HIGH-
SPEED TIA
To use DE0 as the input of the high-speed TIA, set the following
register values:
analog.com
and R of High-Speed TIA When Using DE0 and DE1 Electrodes (Continued)
TIA
Figure 21. High-Speed TIA Circuitry
R and R Value (Ω)
LOAD03 LOAD05
50
50
50
50
50
50
50
50
50
50
100
100
100
100
100
100
100
100
100
100
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.
DE0RESCON = value required to set R
►
Table 120.
HSRTIACON, Bits[3:0] = 0xF to disconnect R
►
speed TIA.
ADuCM356
R and R Value
TIA2_03 TIA2_05
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
and R
LOAD03 TIA2_03
from the high-
TIA2
Rev. A | 99 of 312
. See