LSP2908

Features:

 Eight amplifier channels in one package
  Outputs from –298 V to +160 V per channel
  Programmable output current limit (100 µA to 500 µA)
  Variable voltage gain set by external resistors


Application

Optical crosspoint switches
Optical microelectromechanical systems (MEMS) components


Pinout




Specifications

Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability.

Parameter	Min	Typ	Max	Unit
Power Supply: VHN VHP VLP VHP - VHN	0 VLP 4.5 0	-180.0 VLP 12.0 195.0	-300.0 160.0 20.0 300.0	V V V V
Operating Temperature	-40	25	85	oC
Storage Temperature	-65	25	159	oC
Ambient Temperature	-	-	300	oC

Description

The LSP2908 eight-channel, high-voltage (HV) driver is targeted for microoptomechanical systems. Each device contains eight high-voltage amplifiers with an output voltage range of 298 V to +160 V on the condition that |VHP VHN| 300 V. Voltage gain is set by external resistors. Each amplifier can output up to 500 µA, ideal for deflection and control of optical MEMS mirrors. Output current limit is programmed by an external resistor. Additionally, careful attention is paid to minimizing offset drift over temperature.

The LSP2908 requires one negative high-voltage
power supply (VHN) and one positive low-voltage
power supply (VLP). For positive output voltage appli-
cations, one positive high-voltage power supply
(VHP) is required. Corresponding to the eight chan-
nels are the eight inverting input pins, INx
(x = 1, 2, . . . , 8), and the corresponding eight output
pins, OUTPUTx (x = 1, 2, . . . , 8). Figure 1 is the
internal functional block diagram.

+IN is the noninverting input for all eight amplifiers.
All the amplifiers share the same noninverting input.
+IN should be connected to GND. The IBIAS pin will
set the current limit ((100 µA to 500 µA) ± 20%) for
the amplifiers by connecting it to an external resistor
Rib. The LSP2908 is available in a leaded surface-
mount 44-pin MQFP package.