Document
Dual Pico Amp Diodes
CORPORATION
DPAD1 / DPAD2 / DPAD5 / DPAD10 / DPAD20 / DPAD50 / DPAD100 SSTDPAD5 / SSTDPAD10 / SSTDPAD20 / SSTDPAD50 / SSTDPAD100
FEATURES
• High OFF Isolation. . . . . . . . . . . . . . . . . 1 pA max DPAD1 Isolation between diodes. . . . . . Typical 20 fA • Excellent • Matched Capacitance • Op Amp Protection Devices • Diode Switching • High Impedance Protection
DESCRIPTION Calogic’s ultra low leakage dual pico amp diodes out perform conventional diodes for applications where reverse current (leakage) is critical and must be kept at a minimum. The devices have very low capacitance and are also fast switching. Housed in a compact dual hermetic package and a plastic surface mount SO-8 this product is also available in chip form for hybrid uses. ORDERING INFORMATION Part DPAD1 DPAD2/50 SSTDPAD5/100 XDPAD5/100 Package Temperature Range -55 to +150oC -55 to +150oC -55 to +150oC -55 to +150oC Hermetic TO-78 Hermetic TO-71 Plastic SO-8 Sorted Chips in Carriers
APPLICATIONS
PIN CONFIGURATION
TO-71 (MODIFIED) (PINS 2 AND 6 REMOVED)
TO-78 (MODIFIED) (DPAD1 ONLY)
N/C A2 C2 C2 C1 C1 A1 N/C SO-8
A 1 C2
A2 C1
C2 3 2 A1 1 A2 4
C
C2 A1
A2
C1
CASE C 2 3 A1
C2 4 A2 5 1 C1
CJ1, CJ2, CJ4
C1 BOTTOM VIEW (ALTERNATE)
BOTTOM VIEW
SCHEMATIC DIAGRAM
A
C
C
A
DPAD1 / DPAD2 / DPAD5 / DPAD10 / DPAD20 / DPAD50 / DPAD100 SSTDPAD5 / SSTDPAD10 / SSTDPAD20 / SSTDPAD50 / SSTDPAD100
CORPORATION
ABSOLUTE MAXIMUM RATINGS (25oC) Forward Gate Current, Each Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Total Device Dissipation @ TA = 25oC Derate 4.0 mW/ oC to 125oC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400 mW Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -55 to +125oC Lead Temperature (1/16" from case for 10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300oC
ELECTRICAL CHARACTERISTICS (25oC unless otherwise noted)
SYMBOL STATIC -1 -2 -5 IR Reverse Current -10 -20 -50 -100 -45 BVR VF DYNAMIC 0.8 CR Capacitance 2.0 | CR1 - CR2 | Differential Capacitance 0.1 0.2 pF VR1 = VR2 = -5 V, f = 1 MHz pF VR = -5 V, f = 1 MHz DPAD10, 20, 50, 100 DPAD1, 2, 5, 10, 20, 50, 100 DPAD1, 2, 5 Breakdown Voltage (Reverse) -35 Forward Voltage Drop 0.8 1.5 V -120 IR = -1 µA IF = 5 mA pA VR = -20 V DPAD1 DPAD2 DPAD5 DPAD10 DPAD20 DPAD50 DPAD100 DPAD1, 2, 5 DPAD10, 20, 50, 100 DPAD1, 2, 5, 10, 20, 50, 100 CHARACTERISTICS MIN TYP MAX UNIT TEST CONDITIONS
DPAD10 _ D1 D3 +15V D2 + D4 -15V
e in
IR < 1 pA DPAD1
+V
-V DPAD1
+
1
J110 C CONTROL SIGNAL
J210 VOUT
APPLICATION Operational Amplifier Protection. Input Differential Voltage limited to 0.8 V (typ) by DPADS D1 and D2 Common mode input voltage limited by DPADS D3 and D4 to ±15V. Typical sample and hold circuit with clipping, DPAD diodes reduce offset voltages fed capacitively from the FET switch gate.
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