MAX4052 Maxim, MAX4052 Datasheet - Page 11

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MAX4052

Manufacturer Part Number
MAX4052
Description
The MAX4051/MAX4052/MAX4053 and MAX4051A/MAX4052A/MAX4053A are low-voltage, CMOS analog ICs configured as an 8-channel multiplexer (MAX4051/A), two 4-channel multiplexers (MAX4052/A), and three single-pole/double-throw (SPDT) switches (MAX4053/A)
Manufacturer
Maxim
Datasheet
The MAX4051/MAX4052/MAX4053 and MAX4051A/
MAX4052A/MAX4053A construction is typical of most
CMOS analog switches. They have three supply pins:
V+, V-, and GND. V+ and V- are used to drive the inter-
nal CMOS switches and set the limits of the analog volt-
age on any switch. Reverse ESD-protection diodes are
internally connected between each analog signal pin
and both V+ and V-. If any analog signal exceeds V+ or
V-, one of these diodes will conduct. During normal
operation, these (and other) reverse-biased ESD diodes
leak, forming the only current drawn from V+ or V-.
Table 1. Truth Table/Switch Programming
X = Don’t care
Note: NO and COM pins are identical and interchangeable. Either may be considered an input or output; signals pass equally well
__________Applications Information
INH
1
0
0
0
0
0
0
0
0
in either direction.
ADDC*
X
0
0
0
0
1
1
1
1
Power-Supply Considerations
______________________________________________________________________________________
* ADDC not present on MAX4052.
ADDRESS BITS
ADDB
X
0
0
1
1
0
0
1
1
ADDA
X
0
1
0
1
0
1
0
1
Overview
Low-Voltage, CMOS Analog
All switches open
MAX4051A
COM–NO0
COM–NO1
COM–NO2
COM–NO3
COM–NO4
COM–NO5
COM–NO6
COM–NO7
MAX4051/
Virtually all the analog leakage current comes from the
ESD diodes. Although the ESD diodes on a given signal
pin are identical, and therefore fairly well balanced,
they are reverse biased differently. Each is biased by
either V+ or V- and the analog signal. This means their
leakages will vary as the signal varies. The difference in
the two diode leakages to the V+ and V- pins consti-
tutes the analog signal path leakage current. All analog
leakage current flows between each pin and one of the
supply terminals, not to the other switch terminal. This is
why both sides of a given switch can show leakage cur-
rents of either the same or opposite polarity.
There is no connection between the analog signal
paths and GND.
Multiplexers/Switches
All switches open
ON SWITCHES
COMB–NO0B,
COMB–NO1B,
COMB–NO2B,
COMB–NO3B,
COMB–NO0B,
COMB–NO1B,
COMB–NO2B,
COMB–NO3B,
COMA–NO0A
COMA–NO1A
COMA–NO2A
COMA–NO3A
COMA–NO0A
COMA–NO1A
COMA–NO2A
COMA–NO3A
MAX4052A
MAX4052/
All switches open
COMA–NCA,
COMB–NCB,
COMA–NOA,
COMB–NCB,
COMA–NCA,
COMB–NOB,
COMA–NOA,
COMB–NOB,
COMA–NCA,
COMB–NCB,
COMA–NOA,
COMB–NCB,
COMA–NCA,
COMB–NOB,
COMA–NOA,
COMB–NOB,
COMC–NCC
COMC–NCC
COMC–NCC
COMC–NCC
COMC–NOC
COMC–NOC
COMC–NOC
COMC–NOC
MAX4053A
MAX4053/
11

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