Figure 6-15 shows a MAX406 combined with a MAX131 ADC to form a buffered pH probe. This circuit eliminates expensive low-leakage cables that often connect pH probes to meters. The MAX406 and a lithium battery are included in the probe housing. A conventional low-cost cable carries the buffered pH signal to the MAX131. In most cases, the 3-V battery life exceeds the functional life of the probe.Figures 6-16, 6-17, and 6-18 show the offset-voltage adjustment, feedback compensation, and pin configurations, respectively for the MAX406. Notice that the feedback compensation (Fig. 6-17) is not required in all cases. MAXIM NEW RELEASES DATA Book, 1993, P. 3-5, 3-28, 3-29.
The MAX4617/MAX4618/MAX4619 are high-speed, lowvoltage, CMOS analog ICs configured as an 8-channel multiplexer (MAX4617), two 4-channel multiplexers (MAX4618), and three single-pole/double-throw (SPDT) switches (MAX4619).
These CMOS devices can operate continuously with a +2V to +5.5V single supply. Each switch can handle Rail-to-Rail® analog signals. The off-leakage current is only 1nA at TA = +25°C and 10nA at TA = +85°C. All digital inputs have 0.8V to 2.4V logic thresholds, ensuring TTL/CMOS-logic compatibility when using a single +5V supply.
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Battery-Operated EquipmentAudio/Video Signal RoutingLow-Voltage Data-Acquisition SystemsCommunications Circuits
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*Fast Switching Times 15ns tON 10ns tOFF*Pin Compatible with Industry-Standard 74HC4051/74HC4052/74HC4053 and MAX4581/MAX4582/MAX4583*Guaranteed On-Resistance 10W max (+5V Supply) 20W max (+3V Supply)*Guaranteed 1W On-Resistance Match Between Channels (single +5V supply)*Guaranteed Low Off-Leakage Current: 1nA at +25°C*Guaranteed Low On-Leakage Current: 1nA at +25°C*+2V to +5.5V Single-Supply Operation*TTL/CMOS-Logic Compatible*Low Crosstalk: <-96dB*High Off-Isolation: <-93dB*Low Distortion: <0.017% (600½)
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Voltages Referenced to GND
VCC, A, B, C, or Enable..............................................................-0.3V to +6V
Voltage into Any Analog Terminal
(Note 1) ......................................................................-0.3V to (VCC + 0.3V)
Continuous Current into Any Terminal...............................................±75mA
Peak Current, X_, Y_, Z_
(pulsed at 1ms, 10% duty cycle) ....................................................±200mA
Continuous Power Dissipation (TA = +70°C)
TSSOP (derate 6.7mW/°C above +70°C).......................................533mW
Narrow SO (derate 8.70mW/°C above +70°C)..............................696mW
Plastic DIP (derate 10.53mW/°C above +70°C) ...........................842mW
Operating Temperature Ranges
MAX461_C_ _ .....................................................................0°C to +70°C
MAX461_E_ _ ..................................................................-40°C to +85°C
Storage Temperature Range .........................................-65°C to +150°C
Lead Temperature (soldering, 10sec) ...........................................+300°C
Post a Buying Lead
Required Field 
