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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 -298 V to +160 V per channel Programmable output current limit (100 A to 500 A) Variable voltage gain set by external resistors condition that |VHP - VHN| 300 V. Voltage gain is set by external resistors. Each amplifier can output up to 500 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 (VHN) and one positive low-voltage power supply (VLP). For positive output voltage applications, one positive high-voltage power supply (VHP) is required. Corresponding to the eight channels 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 A to 500 A) 20%) for the amplifiers by connecting it to an external resistor Rib. The LSP2908 is available in a leaded surfacemount 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 -298 V to +160 V on the LSP2908 -IN1 - OUTPUT 1 + -IN8 +IN - OUTPUT 8 + 1682.b(F) Figure 1. LSP2908 Internal Block Diagram LSP2908 8-Channel, High-Voltage Driver Advance Data Sheet September 2001 Pin Information Pin Diagram OUTPUT1 OUTPUT8 34 33 32 31 30 29 28 27 26 25 24 23 12 OUTPUT4 13 NC 14 NC 15 NC 16 +IN 17 GND 18 IBIAS 19 NC 20 NC 21 NC 22 OUTPUT5 NC NC NC -IN8 -IN7 OUTPUT7 OUTPUT6 -IN6 -IN5 NC NC VHN VHP VLP NC NC NC NC NC 36 44 NC NC NC -IN1 -IN2 OUTPUT2 OUTPUT3 -IN3 -IN4 NC NC 1 2 3 4 5 6 7 8 9 10 11 43 42 41 40 39 38 37 35 NC 2467(F) Figure 2. LSP2908 Pin Diagram Pin Descriptions Table 1. Pin Descriptions Pin Number 1, 2, 3, 10, 11, 13, 14, 15, 19, 20, 21, 23, 24, 31, 32, 33, 35, 36, 37, 40, 42, 43 4, 5, 8, 9, 25, 26, 29, 30 6, 7, 12, 22, 27, 28, 34, 44 16 17 18 38 39 41 2 Pin Name NC Function No Connect Pin Total Counts 22 Do not connect. Description -INx OUTPUTx +IN GND IBIAS VHP VLP VHN Analog Input Analog Output Analog Input Ground Current Limit Control Power Supply Power Supply Power Supply 8 8 1 1 1 1 1 1 Inverting input for each channel. Output for each channel. Noninverting input for all channels. Should be grounded. Analog ground. Sets current limit with external resistor to GND. Positive high-voltage power supply. Positive low-voltage power supply. Negative high-voltage power supply. Agere Systems Inc. Advance Data Sheet September 2001 LSP2908 8-Channel, High-Voltage Driver Absolute Maximum Ratings 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. Table 2. Absolute Maximum Ratings Parameter Power Supply: VHN VHP VLP VHP - VHN Operating Temperature Storage Temperature Lead Temperature (soldering 10 seconds) Min 0 VLP 4.5 0 -40 -65 -- Typ -180.0 VLP 12.0 195.0 25 25 -- Max -300.0 160.0 20.0 300.0 85 150 300 Unit V V V V C C C Handling Precautions Although protection circuitry has been designed for this device, proper precautions should be taken to avoid exposure to electrostatic discharge (ESD) during handling and mounting. Agere Systems Inc. employs a humanbody model (HMB) and charged-device model (CDM) for ESD-susceptibility testing and protection design evaluation. ESD voltage thresholds are dependent on the circuit parameters used in the defined model. No industry-wide standard has been adopted for CDM. However, a standard HBM (resistance = 1500 , capacitance = 100 pF) is widely used, and therefore, can be used for comparison purposes. The HBM ESD threshold (>500 V) presented here was obtained by using these circuit parameters. Application Considerations Safe Handling of the High Voltage Device LSP2908 is capable of operating with a negative power supply of up to -300 V or a positive power supply of up to 160 V. Due to the presence of high voltages, special care should be paid to safety issues. Bypass Capacitors/Protection Series Resistor for the Power Supplies To minimize noise coupling to the output, 0.1 F bypass capacitors should be placed as close as possible to all power supply pins. Agere Systems Inc. 3 LSP2908 8-Channel, High-Voltage Driver Advance Data Sheet September 2001 Handling Precautions (continued) Typical Application Circuit In a typical application, the LSP2908 will directly drive the MEMS devices, as shown in Figure 3. One integrated circuit replaces eight discrete amplifiers. 10 M 10 M LSP2908 DAC -IN1 475 k - + OUTPUT 1 MEMS MATRIX DAC -IN 8 475 k - + OUTPUT 8 Rib GND VHN VHP +IN 0.1 F 10 10 0.1 F 1683.b(F) Figure 3. Typical Application Circuit 4 Agere Systems Inc. Advance Data Sheet September 2001 LSP2908 8-Channel, High-Voltage Driver Electrical Characteristics TA = 25 C, VLP = 12 V, VHN = -220 V, VHP = 12 V, noninverting input +IN = 0 V, RI = 475 k, RF = 10 M, IBIAS resistor = 425 k. Table 3. Electrical Characteristics Parameters Input Characteristics Input Resistance Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Bias Current Power Supply Rejection Ratio Symbol R -- -- I(-INx) I(+IN) PSRR VHN VHP VLP -IN Condition -- -IN = 0 V -IN = 0 V 0 C--70 C -IN = 0 V -IN = 0 V -- Min -- -30 -- -5 -40 -- -- -- -5 Typ TBD 0 20 0 0 85 85 52 -- TBD Max -- 30 Unit k mV V/C nA nA dB 5 40 -- -- -- 10 -- Input Range* -- Gain Gain Temperature GTC -- -- Coefficient Amplifier Output Characteristics Output Resistance -- -- -- 80 Amplifier Current Limit* -- Rib = 425 k Output Voltage -- -- VHN + 3.0 V Dynamics Characteristics -3 dB Bandwidth -- -- -- C = 150 pF R = 10 M -- Input pulse = 0 V--5 V Slew Rate C = 150 pF RF = 10 M -- R = 10 M RI = 392 k -- Settling Time, -- Input pulse = 0 V--5 V RF = 10 M C = 150 pF -- R = 10 M RI = 392 k -- Power Supply Currents at Room Temperature Quiescent Current 400 I(VHN) VHN = -150.0 V VLP = 12.0 V I(VHP) 560 VHP = 150.0 V I(VLP) 184 -IN = 0 V 146 Power Consumption P VHN = -150.0 V VLP = 12.0 V VHP = 150.0 V -IN = 0 V * VLP = 12 V, VHN = -150 V, and VHP = 150 V. Controlled by Rib and VLP. Settle to 5%. V V/V/C TBD 100 -- TBD -- 120 VHP - 3.0 V -- k A V kHz 0.62 0.47 197 254 500 600 230 182.5 -- -- -- -- 600 840 276 219 V/s (rising) V/s (falling) s (rising) s (falling) A A A mW Agere Systems Inc. 5 LSP2908 8-Channel, High-Voltage Driver Advance Data Sheet September 2001 Electrical Characteristics (continued) Output Current Range at Different Resistance on Pin IBIAS Figure 4 shows the output current range when different resistances are applied to pin IBIAS. 450 400 350 300 Rib (k) 250 200 150 100 50 0 100 200 300 CURRENT LIMIT (A) 2533(F) VLP = 12 V VLP = 5 V 400 500 Figure 4. Resistor vs. Output Current Limit 6 Agere Systems Inc. Advance Data Sheet September 2001 LSP2908 8-Channel, High-Voltage Driver Package Diagram 13.20 0.20 10.00 0.20 PIN #1 IDENTIFIER ZONE 44 34 1.60 REF 1 33 0.25 GAGE PLANE 13.20 0.20 SEATING PLANE 0.73/1.03 10.00 0.20 DETAIL A 11 23 0.130/0.230 12 22 0.30/0.45 DETAIL A DETAIL B 1.95/2.10 2.35 MAX 0.20 M 0.80 TYP SEATING PLANE 0.10 DETAIL B 0.25 MAX 5-2111(F) Agere Systems Inc. 7 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 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. Copyright (c) 2001 Agere Systems Inc. All Rights Reserved September 2001 DS01-095ASP |
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