DEMO CIRCUIT 819 LT1990, LT1991, AND LT1995 QUICK START GUIDE LT1990, LT1991, and LT1995 Configurable-Gain Amplifiers DESCRIPTION Demonstration circuit 819 is a jumper definable evalua- in various configurations. The DC819 layout includes tion platform featuring the LT1990, LT1991, and LT1995 footprints for TSOT-23-6 and other generic components Configurable-Gain Amplifiers. that may be associated with a more complex evaluation. The Performance Summary below highlights some of the The micropower LT1990 offers high-voltage inputs and key differences in the parts on this evaluation platform. selectable difference gains of 1 or 10. The LT1991 is highly flexible micropower general-purpose precision Design files for this circuit board are available. Call amplifier for gains up to 14. The LT1995 is a high-speed the LTC factory. configurable amplifier for gains up to 8. DC819 provides , LTC and LT are registered trademarks of Linear Technology Corporation. all three of these parts along with signal connectors and jumper fields that allow rapid prototyping and evaluation PERFORMANCE SUMMARY SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Supply Range All parts able to operate 2.5 15 V S I/O Input & Output Signals BNC connectors VREF VIN- VIN+ VOUT Gain Gain-Configurability Range: Difference-Amplifier Configuration LT1990 1 Or 10 LT1991 1 to 13 LT1995 1 to 7 BW Bandwidth: LT1990 G=10 6.5 kHz LT1991 G=9 40 LT1995 G=7 10000 V Input Offset Voltage: OS LT1990 G=1,10 0.8 3 mV LT1991 G=1 0.025 0.1 LT1995 G=1 1 5 SR Slew Rate: LT1990 G=1 0.5 V/s LT1991 0.12 LT1995 G=-2 450 LT1990, LT1991, AND LT1995 Dual Power Supply V COM V+ VREF Signal Source (as needed) VIN VOUT Signal Source Signal Analyzer (as needed) (e.g. Oscilloscope) VIN+ Signal Source (as needed) Figure 2. Proper Measurement Equipment Setup Item Qty Ref-Des Desc Manufacturer s Part Number 1 3 C1,C2,C3 CAP, X7R 10nF 25V 10% 0402 AVX 04023C103KAT 2 4 C4,C5,C6,C7 CAP, X5R 100nF 16V 10% 0402 AVX 0402YD104K 3 2 C9,C8 CAP, X5R 4.7uF 16V 20% 1206 TAIYO YUDEN EMK316BJ475ML-T 4 3 E1,E2,E3 TURRETS MILLMAX 2501-2 5 25 JP1-JP25 HEADER,3PIN, 2mm COMM CON 2802S-03G2 6 5 JP26,SPARE SHUNTS HEADER, 3X2 2mm COMM CON 2202S-06G1 7 4 J1,J2,J3,J4 CONN,BNC,5 PINS CONNEX 112404 8 3 R1,R2,R3 RES, 49.9 OHMS 1% 1/16W 0402 ACC CR05-49R9FM 9 1 R4 RES, 47 OHMS 1% 1/16W 0402 ACC CR05-470FM 10 1 U1 IC, LT1990CS8 LINEAR TECH LT1990CS8 11 1 U2 IC, LT1991CMS LINEAR TECH LT1991CMS 12 1 U3 IC, LT1995CMS LINEAR TECH LT1995CMS 13 26 JP1-JP26 SHUNTS COMM CON CCIJ2MM-138G Figure 3. DC819 Bill-of-Material