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LSP2908 Datasheet

  • LSP2908

  • 8-Channel, High-Voltage Driver

  • 8頁

  • AGERE

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Advance Data Sheet
September 2001
LSP2908
8-Channel, High-Voltage Driver
Features
I
I
I
Eight amplifier channels in one package
Outputs from 鈥?98 V to +160 V per channel
Programmable output current limit (100
碌A
to
500
碌A)
Variable voltage gain set by external resistors
condition that |V
HP
鈥?V
HN
|
鈮?/div>
300 V. Voltage gain is
set by external resistors. Each amplifier can output
up to 500
碌A,
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 (V
HN
) and one positive low-voltage
power supply (V
LP
). For positive output voltage appli-
cations, one positive high-voltage power supply
(V
HP
) is required. Corresponding to the eight chan-
nels are the eight inverting input pins, 鈥揑Nx
(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 I
BIAS
pin will
set the current limit ((100 碌A to 500 碌A) 鹵 20%) for
the amplifiers by connecting it to an external resistor
R
ib
. The LSP2908 is available in a leaded surface-
mount 44-pin MQFP package.
I
Applications
I
I
Optical crosspoint switches
Optical microelectromechanical systems (MEMS)
components
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 鈥?98 V to +160 V on the
LSP2908
鈥揑N1
鈥?/div>
OUTPUT 1
+
鈥揑N8
+IN
鈥?/div>
OUTPUT 8
+
1682.b(F)
Figure 1. LSP2908 Internal Block Diagram

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