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| (R) (R) MX-850 Precision, Higher-Speed 4-Channel, Analog Multiplexers INNOVATION and EXCELLENCE FEATURES * * * * * * 50ns settling time to 0.01% 70ns settling time to 0.003% 100ns settling time to 0.001% 4 Channels, single-ended inputs 100mW power dissipation Small, 14-pin DIP package GENERAL DESCRIPTION The MX-850 is a precision, high-speed multiplexer characterized for 10, 12, 14 and 16-bit applications. The performance benchmarks are its 50 nanosecond maximum settling time to 0.01% accuracy and its unprecedented 0.001% accuracy specification. Packaged in a miniature, 14-pin, ceramic DIP, the MX-850 operates from 15V and +5V supplies and consumes a maximum 270mW. Models are available for either 0 to +70C or -55 to +125C operation. INPUT/OUTPUT CONNECTIONS PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 FUNCTION ENABLE A0 A1 CH1 INPUT CH2 INPUT CH3 INPUT CH4 INPUT OUTPUT GROUND +15V SUPPLY GROUND +5V SUPPLY GROUND -15V SUPPLY Table 1. Channel Addressing ON CHANNEL Disable 1 2 3 4 MUX ADDRESS A1 X 0 0 1 1 EN 1 0 0 0 0 A0 X 0 1 0 1 7 +15V SUPPLY 10 CH1 4 CH2 5 8 OUTPUT CH3 6 12 +5V SUPPLY CH4 7 SWITCH DRIVER 9, 11, 13 GROUND ENABLE 1 14 15V SUPPLY 2 A0 3 A1 Figure 1. Functional Block Diagram DATEL, Inc., Mansfield, MA 02048 (USA) * Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356 * Email: sales@datel.com * Internet: www.datel.com (R) (R) MX-850 ABSOLUTE MAXIMUM RATINGS PARAMETER +15V Supply, Pin 10 -15V Supply, Pin 14 +5V Supply, Pin 12 Digital Inputs, Pins 1, 2, 3 Analog Inputs, Pins 4, 5, 6, 7 Analog Input Current Lead temperature (10 seconds) Switching Frequency/Duty Cycle LIMITS -0.5 to +16.5 +0.5 to -16.5 -0.5 to +7 -0.5 to +6 -10.5 to +10.5 20 300 10/50 UNITS Volts Volts Volts Volts Volts mA C MHz/% SWITCHING CHAR. (cont.) Settling Time, 5k Load 20V step to 0.1% 20V step to 0.01% 20V step to 0.003% 20V step to 0.001% Crosstalk 10kHz (20Vp-p) 1MHz (20Vp-p) 10MHz (5Vp-p) 20MHz (3Vp-p) POWER REQUIREMENTS Power Supply Range +15V Supply -15V Supply +5V Supply Power Supply Current, Quiescent +15V Supply -15V Supply +5V Supply Power Supply Rejection Ratio Power Supply Dissipation, Quiescent +25C 0 to +70C -55 to +125C Pd versus Frequency PHYSICAL/ENVIRONMENTAL Operating Temp. Range, Case MX-850MC MX-850MM Storage Temperature Range Package Type Weight See Figures 3a and 3b. 0 -- +70 C -55 -- +125 C -65 -- +150 C 14-pin, metal-sealed, ceramic DIP 0.1 ounces (2.8 grams) +14.5 -14.5 +4.75 -- -- -- 80 -- -- -- +15 -15 +5 +3 -10 +3 90 +15.5 -15.5 +5.25 +4 -12 +3.5 -- Volts Volts Volts mA mA mA dB mW mW mW MIN. -- -- -- -- -- -- -- -- TYP. 30 50 75 100 -105 -94 -76 -64 MAX. 35 60 85 120 -100 -92 -71 -62 UNITS ns ns ns ns dB dB dB dB FUNCTIONAL SPECIFICATIONS (Apply over the operating temperature range and over the operating power supply range unless otherwise specified.) ANALOG INPUTS Analog Signal Range On Resistance, +25C 0 to +70C -55 to +125C RON versus VIN Input Leakage Current (Off) +25C 0 to +70C -55 to +125C Output Leakage Current (Off) +25C 0 to +70C -55 to +125C On Channel Leakage Current +25C 0 to +70C -55 to +125C Channel Input Capacitance Off On Channel Output Capacitance On Nonlinearity Large signal bandwidth (-3dB) DIGITAL INPUTS Logic levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" MIN. 10 -- -- -- TYP. MAX. UNITS Volts Ohms Ohms Ohms -- -- 18 90 -- 120 -- 140 See Figure 2 0.02 -- -- 0.02 -- -- 0.4 -- -- 4 10 8 -- 100 0.2 10 25 0.2 20 40 1 25 35 6 12 10 0.001 -- -- -- -- -- -- -- -- -- -- -- -- -- -- 80 nA nA nA nA nA nA nA nA nA pF pF pF %FSR MHz 207 270 -- 270 -- 280 See Figure 4 TECHNICAL NOTES +2.0 -- -- -- -- -- -- -- -- +0.8 +10 -10 Volts Volts A A SWITCHING CHARACTERISTICS Access Time Break-Before-Make Delay Time Enable Delay (On, Off) Settling Time, 10M Load 10V step to 0.1% 10V step to 0.01% 10V step to 0.003% 10V step to 0.001% Settling Time, 5k Load 10V step to 0.1% 10V step to 0.01% 10V step to 0.003% 10V step to 0.001% Settling Time, 10M Load 20V step to 0.1% 20V step to 0.01% 20V step to 0.003% 20V step to 0.001% -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 3 25 40 60 80 25 40 60 80 30 50 75 100 20 10 10 30 50 70 100 30 50 70 100 35 60 85 120 ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns 1. Proper operation of the MX-850 multiplexer is dependent upon good board layout and connection practices. Bypass supplies as shown in the connection diagrams. Mount bypass capacitors directly to the supply pins whenever possible. 2. All grounds pins (9, 11, 13) should be tied together and connected to ground as close to the multiplexer as possible. 3. When power is off, current limit input signals on pins 4, 5, 6, and 7 to 20mA. Failure to current limit can cause permanent damage to the device since, when powering up or down it is possible that two switches might be on at the same time. Excessive current (greater than 20mA) will flow from the more positive input to the more negative input, permanently damaging the device. Applications in which the power supply for the multiplexer also powers the signal sources may not require limiting resistors. See Figure 4. (R) (R) MX-850 +125C 120 110 100 POWER DISSIPATION (W) 90 RON (Ohms) 80 70 60 50 40 30 20 10 0.2 1.2 1.5 +25C 1.0 0.75 W 0.7 55C 0.5 10 8 6 4 2 0 2 4 6 8 10 1 2 3 4 INPUT VOLTAGE (Volts) 5 6 7 FREQUENCY (MHz) 8 9 10 Figure 2. Channel On Resistance Versus Input Voltage Figure 4. Power Dissipation Versus Switching Frequency CURRENT LIMITING RESISTORS 120 100 As noted in Technical Note 3, some current limiting technique must be employed to protect the device. The following lists the suggested resistor values for the current limiting resistors shown in Figure 5. Input Range 10V 5V 1V Limiting Resistors R = 500 R = 250 No current limiting needed CROSSTALK (dB) 80 60 40 20 Other current limiting circuits can be used, such as a current limited op amp drive, depending upon the application. 0 100kHz 1MHz 10MHz 100MHz INPUT FREQUENCY 1F + 0.01F Figure 3a. Small Signal Crosstalk Versus Input Frequency 12 1 LOGIC CONTROL 2 3 EN A0 + A1 MX-850 CH1 CH2 CH3 8 CH4 9 GROUND 11 13 OUTPUT 10 + 1F 0.01F +5V 15V 14 1F 15V 0.01F 1V CH1 R ANALOG INPUTS (10V @ 20mA Max.) R R R CH2 MX-850 10M CH4 10pF 4 5 6 7 +15V +15V CH3 (Load of a X10 probe) Figure 5. Typical Connections Figure 3b. Crosstalk Test Circuit (R) (R) MX-850 Table 2. 8 Channel Addressing INPUT CHANNELS 1-8 1 2 3 4 5 6 7 8 ON CHANNEL 1 2 3 4 5 6 7 8 1 0 0 0 0 1 1 1 1 MUX ADDRESS 2 0 0 1 1 0 0 1 1 3 0 1 0 1 0 1 0 1 IN1 IN2 IN3 IN4 OUT A0 IN1 IN2 IN3 IN4 OUT OUTPUT A0 MX-850 EN A1 MX-850 EN A1 (1) (2) (3) CHANNEL EXPANSION The MX-850's ENABLE input provides a means of channel expansion. As shown in Figure 6 and in Table 2, multiple multiplexers may be used by using the ENABLE input as an address line. CHANNEL ADDRESS Figure 6. Cascading Multiple MX-850's MECHANICAL DIMENSIONS INCHES (mm) 0.805 MAX. (20.45) 14-PIN DIP Dimension Tolerances (unless otherwise indicated): 2 place decimal (.XX) 0.010 (0.254) 3 place decimal (.XXX) 0.005 (0.127) Lead Material: Kovar alloy Lead Finish: 50 microinches (minimum) gold plating over 100 microinches (nominal) nickel plating 0.100 TYP. (2.540) 14 1 8 7 0.500 MAX. (12.70) 0.195 MAX. (4.953) 0.600 0.005 (15.240) 0.200 MAX. (5.080) 0.160 MAX. (4.064) 0.100 (2.540) 0.018 0.002 (0.457) 0.010 0.002 (0.254) SEATING PLANE 0.025 0.010 (0.635) 0.100 (2.540) 0.300 0.010 (7.620) ORDERING INFORMATION MODEL MX-850MC MX-850MM OPERATING TEMP. RANGE 0 to +70C -55 to +125C For availability of a high-reliability (QL) version, contact DATEL. DATEL, Inc., Mansfield, MA 02048 (USA) * Tel: (508) 339-3000, (800) 233-2765 Fax: (508) 339-6356 * Email: sales@datel.com * Internet: www.datel.com DATEL makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. The DATEL logo is a registered DATEL, Inc. trademark. |
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