® ® 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. INPUT/OUTPUT CONNECTIONS 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 +70°C or –55 to +125°C operation. PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Table 1. Channel Addressing ON CHANNEL EN MUX ADDRESS A1 A0 Disable 1 2 3 4 1 0 0 0 0 X 0 0 1 1 X 0 1 0 1 FUNCTION ENABLE A0 A1 CH1 INPUT CH2 INPUT CH3 INPUT CH4 INPUT OUTPUT GROUND +15V SUPPLY GROUND +5V SUPPLY GROUND –15V SUPPLY +15V SUPPLY 10 CH1 4 CH2 5 8 OUTPUT CH3 6 12 +5V SUPPLY CH4 7 9, 11, 13 GROUND ENABLE 1 SWITCH DRIVER 2 A0 14 15V SUPPLY 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: [email protected] • Internet: www.datel.com 7 ® ® 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 UNITS SWITCHING CHAR. (cont.) –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 Volts Volts Volts Volts Volts mA °C MHz/% 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 ➀ 10kHz (20Vp-p) 1MHz (20Vp-p) 10MHz (5Vp-p) 20MHz (3Vp-p) 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, +25°C 0 to +70°C –55 to +125°C RON versus VIN Input Leakage Current (Off) +25°C 0 to +70°C –55 to +125°C Output Leakage Current (Off) +25°C 0 to +70°C –55 to +125°C On Channel Leakage Current +25°C 0 to +70°C –55 to +125°C Channel Input Capacitance Off On Channel Output Capacitance On Nonlinearity Large signal bandwidth (–3dB) MIN. ±10 — — — TYP. MAX. — — 18 90 — 120 — 140 See Figure 2 UNITS Volts Ohms Ohms Ohms MIN. TYP. MAX. UNITS — — — — 30 50 75 100 35 60 85 120 ns ns ns ns — — — — –105 –94 –76 –64 –100 –92 –71 –62 dB dB dB dB +14.5 –14.5 +4.75 +15 –15 +5 +15.5 –15.5 +5.25 Volts Volts Volts — — — 80 +3 –10 +3 90 +4 –12 +3.5 — mA mA mA dB — — — 207 270 — 270 — 280 See Figure 4 mW mW mW 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 +25°C 0 to +70°C –55 to +125°C Pd versus Frequency — — — ±0.02 — — ±0.2 ±10 ±25 nA nA nA — — — ±0.02 — — ±0.2 ±20 ±40 nA nA nA — — — ±0.4 — — ±1 ±25 ±35 nA nA nA — — 4 10 6 12 pF pF — — 80 8 — 100 10 ±0.001 — pF %FSR MHz +2.0 — — — — — — — — +0.8 +10 –10 Volts Volts µA µA — — — — — 3 20 10 10 ns ns ns 2. All grounds pins (9, 11, 13) should be tied together and connected to ground as close to the multiplexer as possible. — — — — 25 40 60 80 30 50 70 100 ns ns ns ns — — — — 25 40 60 80 30 50 70 100 ns ns ns ns 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. — — — — 30 50 75 100 35 60 85 120 ns ns ns ns PHYSICAL/ENVIRONMENTAL Operating Temp. Range, Case MX-850MC MX-850MM Storage Temperature Range Package Type Weight 0 — +70 °C –55 — +125 °C –65 — +150 °C 14-pin, metal-sealed, ceramic DIP 0.1 ounces (2.8 grams) ➀ See Figures 3a and 3b. DIGITAL INPUTS Logic levels Logic "1" Logic "0" Logic Loading "1" Logic Loading "0" TECHNICAL NOTES 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% 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. ® ® MX-850 +125°C 1.5 120 110 100 RON (Ohms) 80 70 60 55°C 50 40 POWER DISSIPATION (W) 1.2 +25°C 90 1.0 0.75 W 0.7 0.5 30 20 0.2 10 10 8 6 4 2 0 2 4 6 8 1 10 2 3 4 INPUT VOLTAGE (Volts) Figure 2. Channel On Resistance Versus Input Voltage 5 6 7 FREQUENCY (MHz) 9 8 10 Figure 4. Power Dissipation Versus Switching Frequency CURRENT LIMITING RESISTORS 120 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. CROSSTALK (dB) 100 80 Input Range ±10V ±5V ≤±1V 60 Limiting Resistors R = 500Ω R = 250Ω No current limiting needed 40 Other current limiting circuits can be used, such as a current limited op amp drive, depending upon the application. 20 0 100kHz 1MHz 10MHz 100MHz 1µF + INPUT FREQUENCY 0.01µF Figure 3a. Small Signal Crosstalk Versus Input Frequency 12 1 2 LOGIC CONTROL 3 ±1V +5V EN 15V 14 15V A0 1µF 0.01µF 1µF 0.01µF + A1 CH1 R CH2 CH3 MX-850 10M 10pF CH4 ANALOG INPUTS (±10V @ ±20mA Max.) 4 R 5 R 6 R 7 MX-850 +15V 10 CH1 CH2 CH3 8 CH4 GROUND 9 11 13 (Load of a X10 probe) Figure 5. Typical Connections Figure 3b. Crosstalk Test Circuit +15V + OUTPUT ® ® MX-850 Table 2. 8 Channel Addressing INPUT CHANNELS 1-8 1 2 3 4 5 6 7 8 IN1 IN2 IN3 IN4 IN1 IN2 IN3 IN4 MX-850 MX-850 OUT ON CHANNEL 1 MUX ADDRESS 2 3 1 2 3 4 5 6 7 8 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 OUT OUTPUT EN A1 A0 (1) (2) (3) EN A1 A0 CHANNEL EXPANSION CHANNEL ADDRESS 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. Figure 6. Cascading Multiple MX-850’s MECHANICAL DIMENSIONS INCHES (mm) 14-PIN DIP 0.805 MAX. (20.45) 14 8 1 7 0.500 MAX. (12.70) 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) 0.195 MAX. (4.953) 0.600 ±0.005 (15.240) 0.200 MAX. (5.080) 0.010 ±0.002 (0.254) 0.160 MAX. (4.064) 0.100 (2.540) SEATING PLANE 0.025 ±0.010 (0.635) 0.100 (2.540) 0.300 ±0.010 (7.620) 0.018 ±0.002 (0.457) ORDERING INFORMATION MODEL OPERATING TEMP. RANGE MX-850MC MX-850MM 0 to +70°C –55 to +125°C 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: [email protected] • 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.