Manual

CRD5376
DS612RD2 15
Using this level-shifting 3-to-8 demultiplexer scheme allows flexible control of the analog switches without
directly coupling them to the digital power supplies. With eight possible decoded outputs from three GPIO
pins, multiple combinations of on / off analog switch arrangements are possible.
Independent dual analog switches for each differential channel help to eliminate crosstalk between them.
SW[2..0] DAC_BUF to INA Connection
000 Channel 1 Only
001 Channel 2 Only
010 Channel 3 Only
011 Channel 4 Only
100 Even Channels Connected
101 Odd Channels Connected
110 All Channels Connected
111 All Channels Disconnected
Table 5. Analog Switch Settings
Specification Value
Analog Switch Mux - Texas Instruments CD74HC4051PWR
Surface Mount Package Type TSSOP-16
Power Supply Voltage, Current
+
3.3V, 160 µA
Individual Switch Settings - Ch1, Ch2, Ch3, Ch4 000, 001, 010, 011
Even, Odd Switch Settings - Ch2+Ch4, Ch1+Ch3 100, 101
All On Switch Setting - Ch1+Ch2+Ch3+Ch4 110
All Off Switch Setting 111
Specification Value
Analog Switch Selection - TI LittleLogic Dual-OR SN74LVC2G32DCTR
Surface Mount Package Type SSOP-8
Supply Voltage, Current
+
2.5 V, 10 µA
Specification Value
Dual SPST Analog Switches - Vishay DG2003DS
Surface Mount Package Type SOT23-8
On Resistance Match, + 5 V Supply
1.6 Ω
On Resistance Flatness, + 5 V Supply
0.2 Ω
Off Leakage Current + 1 nA
Off Isolation @ 1 MHz -61 dB
Channel Crosstalk @ 1 MHz -67 dB
Supply Voltage, Power Consumption
+
2.5 V, 5.5 µW