MPC801KG BURR-BROWN [Burr-Brown Corporation], MPC801KG Datasheet - Page 8

• Manufacturer Part Number: MPC801KG
• Description: High Speed CMOS ANALOG MULTIPLEXER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

CHANNEL EXPANSION
Single-Tier Expansion
Up to eight MPC801s can be connected to a single node to
form a 64-channel single-ended multiplexer, or up to eight
MPC801s can be connected to two nodes to form a
32-channel differential multiplexer. Programming is
accomplished with a 6-bit address and a 1-of-8 decoder (see
Figure 5). The decoder drives the enable inputs of the
MPC801 turning on only one multiplexer at a time.
Two-Tier Expansion
Up to nine MPC801s can be connected in a two-tier structure
to form a 64-channel single-ended multiplexer (see Figure
FIGURE 5. 64-channel, Single-tier, Single-ended Expansion.
In1
In2
In3
In8
In1
In2
In3
In8
®
MPC801
MPC801
A
A
MPC801
0
0
A
A
Enable
Enable
1
1
Out A
Out B
Out A
Out B
A
A
2
2
Address Generator
To multiplexers 3 - 8
6-Bit Channel
Decoder
1 of 8
Multiplexer
Output
8
6), or up to five MPC801s can be connected in a two-tier
structure to form a 16-channel differential multiplexer. Pro-
gramming is accomplished with a 6-bit address.
SINGLE VS MULTITIERED CHANNEL EXPANSION
In addition to reducing programming complexity, two-tier
configuration offers the added advantages over single-node
expansion of reduced OFF channel current leakage (reduced
Offset), better CMR, and a more reliable configuration if a
channel should fail in the ON condition (short). Should a
channel fail ON in the single-node configuration, data can-
not be taken from any channel, whereas only one-channel
group is failed (4 or 8) in the multitiered configuration.
FIGURE 6. 64-channel, Two-tier, Single-ended Expansion.
In1
In2
In3
In8
In1
In2
In3
In8
MPC801
MPC801
A
A
0
0
Enable
Enable
A
A
Out A
Out B
Out A
Out B
1
1
A
A
2
2
To multiplexers 3 - 8
Address Generator
6-Bit Channel
In1
In2
In3
In8
MPC801
A
1
A
Enable
2
Out A
Out B
Multiplexer
A
3
Output