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SP782CT Datasheet(PDF) 11 Page - Sipex Corporation |
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SP782CT Datasheet(HTML) 11 Page - Sipex Corporation |
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11 / 16 page  11 SP782/SP784 DS/08 SP782/784 Programmable Charge Pump © Copyright 2000 Sipex Corporation SHUTDOWN MODE The internal oscillator of the SP782 and SP784 can be shutdown through the SD pin. In this state, the V DD and VSS outputs are inactive and the power supply current reduces to 10 µA. LATCH ENABLE PIN The SP782 and SP784 includes a control pin (LAT) that latches the D0 and D1 control lines. Connecting this pin to a logic HIGH state will allow transparent operation of the D0 and D1 control lines. This input can be left floating since there is an internal pull-up resistor which will allow the latch to be transparent. APPLICATIONS INFORMATION The SP782 and SP784 can be used in various applications where ±10V is needed from a +5V source. Analog switches, op-amp power sup- plies, and LCD biasing are some applications where the charge pumps can be used. The charge pump can also be used for supplying voltage rails for RS-232 drivers needing ±12V. The ±10V output from the charge pump is more than adequate to provide the proper V OH and V OL levels at the driver output. Figure 8 shows how the SP784 can be used in conjunction with the SP524 multiprotocol transceiver IC. The programmability is ideal for RS-232 and RS-423 levels. The RS-232 driver output voltage swing ranges from ±5V to ±15V. In order to meet this requirement, the charge pump must generate ±10V to the transceiver IC. The RS-423 driver output voltage range is ±4.0V to ±6.0V. When the SP524 transceiver is programmed to RS-423 mode (V.10), the charge pump now provides ±5V, through D0 and D1, thus allowing the driver outputs to comply with V OC ≤ 6.0V as well as the VT requirement of ±4.0V minimum with a 450Ω load to ground. In older configurations, separate DC sources needed to be configured or regulated down from ±10V to ±5V in a given application. A typical charge pump providing V DD and VSS would require external clamping such as 5V Zener diodes. RS-423 (V.10) is usually found in RS-449, EIA-530, EIA-530A, and V.36 modes. When the control lines D0 and D1 are both at a logic HIGH, V DD = +5V and VSS = -5V. All other inputs to the control lines result in V DD = +10V and V SS = -10V. Control of the SP784 in an application with Sipex's SP524 can be found in Figure 8. |
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