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MC34708 数据表(PDF) 69 Page - Freescale Semiconductor, Inc |
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MC34708 数据表(HTML) 69 Page - Freescale Semiconductor, Inc |
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69 / 159 page  Analog Integrated Circuit Device Data 69 Freescale Semiconductor MC34708 Functional Block Description 7.5.6.6 VREFDDR VREFDDR is an internal PMOS half supply Voltage Follower. The output voltage is at one half the input voltage. It’s typical application is as the VREF for DDR memories. A filtered resistor divider is utilized to create a low frequency pole. This divider then utilizes a voltage follower to drive the load. tON-VPLL Turn-on Time • Enable to 90% of end value VIN = VINMIN, VINMAX IL = 0 - - 120 µs tOFF-VPLL Turn-off Time • Disable to 10% of initial value VIN = VINMIN, VINMAX, IL = 0 0.05 - 10 ms VPLLOS- START Start-up Overshoot •VIN = VINMIN, VINMAX IL = 0 - 1.0 2.0 % VPLL-LO TRANSIENT Transient Load Response •VIN = VINMIN, VINMAX - 50 70 mV VPLL-LI TRANSIENT Transient Line Response •IL = 75% of ILMAX - 5.0 8.0 mV Table 58. VREFDDR Electrical Specification Characteristics noted under conditions BP = 3.6 V, VBUS = 5.0 V, -40 C TA 85 C, unless otherwise noted. Typical values at BP = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted. Symbol Characteristic Min Typ Max Unit Notes GENERAL VREFFDDRIN Operating Input Voltage Range VINMIN to VINMAX 1.2 - 1.8 V IREFDDR Operating Current Load Range ILMIN to ILMAX 0.0 - 10 mA VREFDDR ACTIVE MODE – DC VREFDDR Output Voltage VOUT •VINMIN < VIN < VINMAX ILMIN < IL < ILMAX 0.6 VIN/2 0.9 V VREFDDRTOL Output Voltage tolerance •VINMIN < VIN < VINMAX IL = 1.0 mA -6.5 - 6.5 % (58) VREFDDR LOPP Load Regulation •1.0 mA < IL < ILMAX For any VINMIN < VIN < VINMAX - 5.0 - mV/mA IREFDDRQ Quiescent Current •VINMIN < VIN < VINMAX IL = 0 - 8.0 - µA VREFDDR ACTIVE MODE – AC tON-VREFDDR Turn-on Time • Enable to 90% of end value VIN = VINMIN, VINMAX IL = 0 - - 100 µs tOFF- VREFDDR Turn-off Time • Disable to 10% of initial value VIN = VINMIN, VINMAX, IL = 0 0.05 - 10 ms VREFDDROS Start-up Overshoot •VIN = VINMIN, VINMAX IL = 0 - 1.0 2.0 % Table 57. VPLL Electrical Specification Characteristics noted under conditions BP = 3.6 V, VBUS = 5.0 V,-40 C TA 85 C, unless otherwise noted. Typical values at BP = 3.6 V and TA = 25 °C under nominal conditions, unless otherwise noted. Symbol Characteristic Min Typ Max Unit Notes |
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