LTC6561 Four-Channel Multiplexed Transimpedance Amplifier with Output Multiplexing FEATURES DESCRIPTION n 220MHz 3dB Bandwidth with 2pF Input Capacitance The LTC 6561 is a low-noise four-channel, transimped- n Single-Ended Output ance amplifier (TIA)with 220MHz bandwidth. The LTC6561 n 74k Transimpedance Gain multi-channel transimpedance amplifiers low noise, high n 4.8pA/Hz Input Current Noise Density at transimpedance, and low power dissipation are ideal for 200MHz (2pF) LIDAR receivers using Avalanche Photodiodes (APDs). n 64nA Integrated Input Current Noise Over The amplifier features 74k transimpedance gain and RMS 200MHz (2pF) 30A linear input current range. Using an APD input cir- n Linear Input Range 0A to 30A cuit with a total capacitance of 2pF, the input current noise n Overload Current > 400mA Peak density is 4.5pA/Hz at 200MHz. With lower capacitance, n Fast Overload Recovery 12ns, 1mA noise and bandwidth improve further. Only a 5V single n Fast Channel Switchover < 50ns supply is needed and the device consumes only 200mW. n Single 5V Supply Utilizing the internal 4-to-1 MUX along with the LTC6561s n 200mW Power Dissipation for 4 Channels output MUX multiple 4-channel LTC6561 devices can be n 2V Output Swing on 100 Load combined to directly interface with 8, 12, 16 and 32-chan- P-P n 4mm 4mm, 24-Lead QFN Package nel APD arrays. The LTC6561s fast overload recovery n Output MUX Combines Multiple 4-Channel Devices and fast channel switchover make it well suited for LIDAR to Create 4, 8,12,16, 24, 32 Channel Solutions receivers with multiple APDs. Its single-ended output can n AEC-Q100 Qualified for Automotive Applications swing 2V on a 100 load. While its low impedance op P-P amp-style output can drive back-terminated 50 cables. The LTC6561 is packaged in a compact 4mm 4mm APPLICATIONS 24-pin leadless QFN package with an exposed pad for n LIDAR Receiver thermal management and low inductance. n Industrial Imaging All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION Typical Application with DC-Coupled Inputs Driving a Time-to-Digital Pulse Response at the Edge of Converter with Back-Terminated Cable the Overload Region (40A) MULTIPLE LTC6561s WIRE-OR 47.5 OUT(2) MUX OUTPUT RESPONSE V V LTC6561 CC1,2 CCO TIA (0.5V/DIV) TIME-OF-FLIGHT DETECTOR IN1 47.5 V OUT OUTPUT REF1 TIA STAGE WITH SERIES 50, IN2 INTO 50 LOAD,RT = 37k EFF 50 + V REF2 4:1 GAIN TIA MUX IN3 INPUT PULSE 150V OUTTERM V (20A/DIV) REF3 APD ARRAY TIA IN4 6561 F01b O MUX(2) 5ns/DIV V REF4 GND CHSEL1,0 O MUX 6561 TA01a Rev. C 1 Document Feedback For more information www.analog.comLTC6561 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Total Supply Voltage (V , V , V to GND) ......5.5V CC1 CC2 CCO Voltage (CHSEL0, CHSEL1, O MUX) ............. 0.3V to 5.5V Amplifier Reference Current (V , V , REF1 REF2 24 23 22 21 20 19 V , V ) ....................................................... 10mA REF3 REF4 V 1 18 V CCO CCO Amplifier Reference Voltage (V , V , REF1 REF2 CHSEL0 2 17 O MUX V , V ) ............................................ 0.3V to 3.5V REF3 REF4 V 3 16 V CC1 CC2 25 Amplifier Input Current (IN1, IN2, GND V 4 15 V REF1 REF4 IN3, IN4) .................400mA RMS 2A Transient (10ns) GND 5 14 GND IN1 6 13 IN4 Amplifier Output Current (OUT, OUTTERM) ........ +80mA Operating Temperature Range 7 8 9 10 11 12 LTC6561I (Note 2)................................40C to 85C LTC6561H (Note 3) ............................ 40C to 125C UF PACKAGE Storage Temperature Range .................. 65C to 150C 24-LEAD (4mm 4mm) PLASTIC QFN Junction Temperature ........................................... 150C T = 150C, = 47C/W, = 4.5C/W JMAX JA JC EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION TUBE TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC6561IUF PBF LTC6561IUF TRPBF 6561 24-LEAD (4mm 4mm) PLASTIC QFN 40C to 85C LTC6561HUF PBF LTC6561HUF TRPBF 6561 24-LEAD (4mm 4mm) PLASTIC QFN 40C to 125C AUTOMOTIVE PRODUCTS** LTC6561HUF WPBF LTC6561HUF WTRPBF 6561 24-LEAD (4mm 4mm) PLASTIC QFN 40C to 125C Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for thesemodels. AC ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25C, V = V = 5V, O MUX = 0V, GND = 0V, Z = 100. Output is A CC1,2 CC0 LOAD AC-coupled. Output taken from OUT pin. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS BW 3dB Bandwidth 200mV and C = 2pF 220 MHz P-P,OUT IN,TOT R Small Signal Transimpedance I < 2A 63 74 85 k T IN P-P l 47.7 101 R Input Impedance f = 100kHz 236 IN R Output Impedance f = 100kHz 3 OUT Rev. C 2 For more information www.analog.com IN2 CHSEL1 GND OUT V GND REF2 V GND REF3 GND OUTTERM IN3 DNC