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BD3533FVM Scheda tecnica(PDF) 10 Page - Rohm |
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BD3533FVM Scheda tecnica(HTML) 10 Page - Rohm |
10 / 17 page 10/16 ◎ BD3532EFV ● PIN CONFIGRATION ● PIN FUNCTION PIN No. PIN NAME PIN FUNCTION 1 VTT1 Termination Output Pin 1 2 VTT2 Termination Output Pin 2 3 PGND1 Power Ground Pin 1 4 PGND2 Power Ground Pin 2 5 SGND Ground Pin for Reference Voltage 6 EN Enable Input Pin 7 VTTS Detector Pin for Termination Voltage 8 N.C. Non Connection 9 VREF Reference Voltage Output Pin 10 VREFS Detector Pin for Reference Voltage 11 N.C. Non Connection 12 VDDQ Reference Voltage Input Pin 13 N.C. Non Connection 14 VCC VCC Pin 15 N.C. Non Connection 16 VTT_IN1 Termination Input Pin 1 17 VTT_IN2 Termination Input Pin 2 18 N.C. Non Connection 19 N.C. Non Connection 20 AGND Ground Pin for Analog Ground - FIN Substrate (Connected to AGND) ● Description of operations ・ VCC In BD3533/31/32, an independent power input pin is provided for an internal circuit operation of the IC. This is used to drive the amplifier circuit of the IC, and its maximum current rating is 4 mA. The power supply voltage is 3.3 to 5.5 volts (BD3533) or 5 volts (BD3531/32). It is recommended to connect a bypass capacitor of 1 μF or so to VCC. ・ VDDQ Reference input pin for the output voltage, that may be used to satisfy the JEDEC requirement for DDR-SDRAM (VTT = 1/2VDDQ) by dividing the voltage inside the IC with two 50 kΩ voltage-divider resistors For BD3533, care must be taken to an input noise to VDDQ pin because this IC also cuts such noise input into half and provides it with the voltage output divided in half. Such noise may be reduced with an RC filter consisting of such resistance and capacitance (220 Ω and 2.2 μF, for instance) that may not give significant effect to voltage dividing inside the IC. ・ VTT_IN VTT_IN is a power supply input pin for VTT output. Voltage in the range between 1.0 and 5.5 volts may be supplied to this VTT_IN terminal, but care must be taken to the current limitation due to on-resistance of the IC and the change in allowable loss due to input/output voltage difference. Generally, the following voltages are supplied: ・ DDR I VTT_IN=2.5V ・ DDRII VTT_IN=1.8V Higher impedance of the voltage input at VTT_IN may result in oscillation or degradation in ripple rejection, which must be noted. To VTT_IN terminal, it is recommended to use a 10 μF capacitor characterized with less change in capacitance. But it may depend on the characteristics of the power supply input and the impedance of the pc board wiring, which must be carefully checked before use. ・ VREF In BD3533/31/32, a reference voltage output pin independent from VTT output is given to provide a reference input for a memory controller and a DRAM. Even if EN pin turns to “Low” level, VREF output is kept unchanged, compatible with “Self Refresh” state of DRAM. The maximum current capability of VREF is 20 mA, and a suitable capacitor is needed to stabilize the output voltage. It is recommended to use a combination of a 1.0 to 2.2 μF ceramic capacitor characterized with less change in capacitance and a 0.5 to 2.2 Ω phase compensator resistor, or a 10μF ceramic or tantalum capacitor instead. For an application where VREF current is low, a capacitor of lower capacitance may be used. If VREF current is 1 mA or less, it is possible to secure a phase margin with a ceramic capacitor of 1 μF more or less. ・ VTTS An independent pin provided to improve load regulation of VTT output. In case that longer wiring is needed to the load at VTT output, connecting VTTS from the load side may improve the load regulation. VTT1 VTT2 PGND1 PGND2 SGND EN VTTS NC VREF VREFS AGND NC NC VTT_IN VTT_IN NC VCC NC VDDQ NC |
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