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ADM8840ACP Datenblatt(PDF) 9 Page - Analog Devices |
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ADM8840ACP Datenblatt(HTML) 9 Page - Analog Devices |
9 / 10 page ADM8840 –9– REV. PrG 2/03 PRELIMINARY TECHNICAL DATA BOOSTING THE CURRENT DRIVE OF THE +/-15V SUPPLY The ADM8840 +/-15V output can deliver 100uA of current in the typical configuration, as shown in Figure 5. In this configuration the 5Vout (pin 4) is connected to 5Vin (pin 5), as can be seen on block diagram Page 1 of this data sheet. SERIAL INTERFACE VREF DAC 1 DAC 2 8 8 CLK DATA CS / LDAC LEVEL TRANSLATOR PO WER BUFFER + - - + COM_IN 4.7 F 4.7 F C PANEL 5k 4.7 F OSCILLATOR CONTROL LOGIC TIMING GENERATOR SHUTDOWN CONTROL DISCHARGE VOLTAGE DOUBLER C1+ C1- SHDN VCC LDO VOLTAGE REGULATOR 5VOUT 2.2 F C7 DOUBLE TRIPLE VOLTAGE TRIPLER VOLTAGE INVERTER C2+ C2- C3+ C3- VOUT VOLTAGE ADDER C5+ C5- +15V C4+ C4- -15V ADM8840 0.22 F 3.3 F 3.3 F 3.3 F 0.22 F 0.22 F 0.22 F 0.22 F DAC1_SD DAC1_IN INT/EXT DAC 1 INT/EXT DAC 2 DAC2_SD DAC2_IN C4 C2 C3 C9 C8 ADD_OUT TRANS_OUT COM_OUT_AC COM_OUT GND C5 C10 C11 C12 C13 4.7 F C6 C1 22nF 5VIN +5V Current Boost Configuration Connection Figure 5. Typical Configuration It is possible to configure the ADM8840 to supply up to 400uA on the +/-15V outputs, by changing its configuration slightly, as shown in Figure 6. SERIAL INTERFACE VREF DAC 1 DAC 2 8 8 CLK DATA CS / LDAC LEVEL TRANSLATOR PO WER BUFFER + - - + COM_IN 4.7 F 4.7 F C PANEL 5k 4.7 F OS CILLATOR CONTROL LOGIC TIMING GENERATOR SHUTDOWN CONTROL DISCHARGE VOLTAGE DOUBLER C1+ C1- SHDN VCC LDO VOLTAGE REGULATOR 5VOUT 2.2 F C7 DOUBLE TRIP LE VOLTAGE TRIPLER VOLTAGE INVERTER C2+ C2- C3+ C3- VOUT VOLTAGE ADDER C5+ C5- +15V C4+ C4- -15V ADM8840 0.22 F 3.3 F 3.3 F 3.3 F 0.22 F 0.22 F 0.22 F 0.22 F DAC1_SD DAC1_IN INT/EXT DAC 1 INT/EXT DAC 2 DAC2_SD DAC2_IN C4 C2 C3 C9 C8 ADD_OUT TRANS_OUT COM_OUT_AC COM_OUT GND C5 C10 C11 C12 C13 4.7 F C6 C1 22nF 5VIN +5V Figure 6. Current Boost Configuration The configuration in Figure 6, can supply up to 400uA of current on both the +15V and the -15V outputs. If the load on the +/-15V does not draw any current the voltage on the +/-15V outputs can rise up to +/-16.5V.In this configuration Vout (pin 3) is connected to 5Vin (pin 5). |
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Ähnliche Beschreibung - ADM8840ACP |
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