Datasheet MAX4635, MAX4636 (Maxim) - 8
| Manufacturer | Maxim |
| Description | Fast, Low-Voltage, Dual 4Ω SPDT CMOS Analog Switches |
| Pages / Page | 11 / 8 — Fast, Low-Voltage, Dual 4. SPDT. CMOS Analog Switches. Detailed … |
| File Format / Size | PDF / 251 Kb |
| Document Language | English |
Fast, Low-Voltage, Dual 4. SPDT. CMOS Analog Switches. Detailed Description. Logic Inputs. Analog Signal Levels
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Fast, Low-Voltage, Dual 4
Ω
SPDT CMOS Analog Switches Detailed Description Logic Inputs
The MAX4635/MAX4636 logic inputs (IN1, IN2) can be The MAX4635/MAX4636 are low-on-resistance (RON), driven up to +5.5V, regardless of the voltage on V+. low-voltage, dual SPDT analog switches that operate This allows interfacing to 5V logic signals while operat- from a +1.8V to +5.5V supply. The MAX4635/MAX4636 ing with a +3.3V supply voltage without external level feature very fast switching speed (tON = 14ns max, translation. tOFF = 6ns max) and guaranteed break-before-make switching. The low maximum RON allows high continu-
Analog Signal Levels
ous currents to be switched in a variety of applications. Analog signals ranging over the entire supply voltage
Applications Information
(V+ to GND) can be passed with very little change in on-resistance (see Typical Operating Characteristics). The switches are bidirectional, so the NO_, NC_, and COM_ pins may be used as either inputs or outputs.
Power-Supply Sequencing and
V+ 10nF
Overvoltage Protection Caution: Do not exceed the absolute maximum rat- ings because stresses beyond the listed ratings can
V+
cause permanent damage to the device.
Proper
MAX4635/MAX4636
COM_ MAX4635 power-supply sequencing is recommended for all MAX4636 CMOS devices. Always apply V+ before applying ana- IN_ VINL log signals, especially if the analog signal is not current CAPACITANCE OR limited. If this sequencing is not possible, and if the V METER NC_ OR INH analog inputs are not current limited to less than 30mA, NO_ add a small-signal diode (D1) as shown in Figure 5. If f = 1MHz GND the analog signal can dip below GND, add D2. Adding protection diodes reduces the analog range to a diode drop (about 0.7V) below V+ (for D1), and a diode drop above ground (for D2). Figure 3. Channel Off/On-Capacitance +5V 10nF V OFF-ISOLATION = 20log OUT V NETWORK IN ANALYZER V+ 50Ω 50Ω VOUT 0 OR V+ IN_ VIN ON-LOSS = 20log COM_ V IN MAX4635 VOUT NC_ CROSSTALK = 20log MAX4636 V IN VOUT MEAS REF NO_ 50Ω GND 50Ω 50Ω MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. Figure 4. On-Loss, Off-Isolation, and Crosstalk
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Ω
SPDT CMOS Analog Switches Detailed Description Logic Inputs
The MAX4635/MAX4636 logic inputs (IN1, IN2) can be The MAX4635/MAX4636 are low-on-resistance (RON), driven up to +5.5V, regardless of the voltage on V+. low-voltage, dual SPDT analog switches that operate This allows interfacing to 5V logic signals while operat- from a +1.8V to +5.5V supply. The MAX4635/MAX4636 ing with a +3.3V supply voltage without external level feature very fast switching speed (tON = 14ns max, translation. tOFF = 6ns max) and guaranteed break-before-make switching. The low maximum RON allows high continu-
Analog Signal Levels
ous currents to be switched in a variety of applications. Analog signals ranging over the entire supply voltage
Applications Information
(V+ to GND) can be passed with very little change in on-resistance (see Typical Operating Characteristics). The switches are bidirectional, so the NO_, NC_, and COM_ pins may be used as either inputs or outputs.
Power-Supply Sequencing and
V+ 10nF
Overvoltage Protection Caution: Do not exceed the absolute maximum rat- ings because stresses beyond the listed ratings can
V+
cause permanent damage to the device.
Proper
MAX4635/MAX4636
COM_ MAX4635 power-supply sequencing is recommended for all MAX4636 CMOS devices. Always apply V+ before applying ana- IN_ VINL log signals, especially if the analog signal is not current CAPACITANCE OR limited. If this sequencing is not possible, and if the V METER NC_ OR INH analog inputs are not current limited to less than 30mA, NO_ add a small-signal diode (D1) as shown in Figure 5. If f = 1MHz GND the analog signal can dip below GND, add D2. Adding protection diodes reduces the analog range to a diode drop (about 0.7V) below V+ (for D1), and a diode drop above ground (for D2). Figure 3. Channel Off/On-Capacitance +5V 10nF V OFF-ISOLATION = 20log OUT V NETWORK IN ANALYZER V+ 50Ω 50Ω VOUT 0 OR V+ IN_ VIN ON-LOSS = 20log COM_ V IN MAX4635 VOUT NC_ CROSSTALK = 20log MAX4636 V IN VOUT MEAS REF NO_ 50Ω GND 50Ω 50Ω MEASUREMENTS ARE STANDARDIZED AGAINST SHORTS AT IC TERMINALS. OFF-ISOLATION IS MEASURED BETWEEN COM_ AND "OFF" NO_ OR NC_ TERMINAL ON EACH SWITCH. ON-LOSS IS MEASURED BETWEEN COM_ AND "ON" NO_ OR NC_ TERMINAL ON EACH SWITCH. CROSSTALK IS MEASURED FROM ONE CHANNEL TO ALL OTHER CHANNELS. SIGNAL DIRECTION THROUGH SWITCH IS REVERSED; WORST VALUES ARE RECORDED. Figure 4. On-Loss, Off-Isolation, and Crosstalk
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