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Technical content

Features

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

Applications

I Optical crosspoint switches I 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 –298 V to +160 V on the condition that |V HP – 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 (V HN) and one positive low-voltage power supply (VLP). For positive output voltage appli- cations, one positive high-voltage power supply HP) 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 I BIAS pin will set the current limit ((100 µA to 500 µA) ± 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. 1682.b(F) Figure 1. LSP2908 Internal Block Diagram

22 Agere Systems Inc. Advance Data Sheet September 20018-Channel, High-Voltage Driver LSP2908 Pin Information Pin Diagram 2467(F) Figure 2. LSP2908 Pin Diagram Table 1. Pin Descriptions 14, 15, 19, 20, 21, 23, 24, 31, 32, 33, 35, 36, 37, 40, 42, 43 NC No Connect 22 Do not connect. 29, 30 –INx Analog Input 8 Inverting input for each channel. 6, 7, 12, 22, 27, 28, 34, 44 OUTPUTx Analog Output 8 Output for each channel. 16 +IN Analog Input 1 Noninverting input for all channels. Should be grounded. 17 GND Ground 1 Analog ground. 18 I BIAS Current Limit Control 1 Sets current limit with external resistor to GND. 38 V HP Power Supply 1 Positive high-voltage power supply. 39 V LP Power Supply 1 Positive low-voltage power supply. 41 V HN Power Supply 1 Negative high-voltage power supply. VHN OUTPUT7 OUTPUT6 –IN6 –IN5 NC NC NC OUTPUT2 OUTPUT3 –IN3 NC NC 44 42 41 40 39 38 37 36 35 3443 12 14 15 16 17 18 19 20 21 2213 –IN7 NC –IN2 –IN8 NC NC NCNC –IN4 VHP VLP NC NC NC NC OUTPUT8 NC NC OUTPUT1 OUTPUT5 NC NC +IN NC NC IBIAS GND NC NC OUTPUT4 –IN1

extended periods can adversely affect device reliability. Table 2. Absolute Maximum Ratings presented here was obtained by using these circuit parameters. 160 V. Due to the presence of high voltages, special care should be paid to safety issues.

circuit replaces eight discrete amplifiers. Figure 3. Typical Application Circuit

Agere Systems Inc. 5 Advance Data Sheet September 2001 8-Channel, High-Voltage Driver LSP2908

Electrical Characteristics

TA = 25 °C, VLP = 12 V, VHN = –220 V, VHP = 12 V, noninverting input +IN = 0 V, RI = 475 kΩ, RF = 10 MΩ, IBIAS resistor = 425 kΩ. Table 3. Electrical Characteristics † Controlled by R ib and VLP.

Agere Systems Inc. 7 Advance Data Sheet September 2001 8-Channel, High-Voltage Driver LSP2908 Package Diagram 5-2111(F) 10.00 ± 0.20 13.20 ± 0.20 10.00 ± 0.20 13.20 ± 0.20 PIN #1 IDENTIFIER ZONE 12 22

0.80 TYP

2.35 MAX 0.10 SEATING PLANE 1.95/2.10DETAIL B

0.25 MAX

0.30/0.45 0.20 M 0.130/0.230 DETAIL B 0.25 0.73/1.03

1.60 REF

Copyright © 2001 Agere Systems Inc. All Rights Reserved September 2001 DS01-095ASP Agere Systems Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. For additional information, contact your Agere Systems Account Manager or the following: INTERNET: http://www.agere.com E-MAIL: docmaster@agere.com N. AMERICA: Agere Systems Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18109-3286 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA: Agere Systems Hong Kong Ltd., Suites 3201 & 3210-12, 32/F, Tower 2, The Gateway, Harbour City, Kowloon Tel. (852) 3129-2000, FAX (852) 3129-2020 CHINA: (86) 21-5047-1212 (Shanghai), (86) 10-6522-5566 (Beijing), (86) 755-695-7224 (Shenzhen) JAPAN: (81) 3-5421-1600 (Tokyo), KOREA: (82) 2-767-1850 (Seoul), SINGAPORE: (65) 778-8833, TAIWAN: (886) 2-2725-5858 (Taipei) EUROPE: Tel. (44) 7000 624624, FAX (44) 1344 488 045