Summary of Contents for Linear Technology DC861A-A
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DUAL, SPI PROGRAMABLE GAIN AMPLIFIER R, LTC6912-1 AND LTC6912-2 DESCRIPTION DC861A-A or -B demonstration circuit f eatures a dual digitally pro- The demo board highlights the f ollowing: grammable gain amplif ier (PG A) I C, LTC6912-1 (DC861A-A) or 1. Two independent digitally programmable gain amplif iers.
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DC861 QUICK START GUIDE (Note 1) Note 1) Note 1: States 13, 14 and 15 (binary 11xx) are not used. Programming a channel to states 8 or higher w il l conf igure that particul ar channel into a l ow pow er shutdow n state. In addition, programming a channel into state 15 (binary 1111) w il l cause that particul ar channel to draw up to 20mA of suppl y current and is not recommended.
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DC861 QUICK START GUIDE Figure 4. DC861A Inputs, Outputs, Jumpers, Sw itches and Connectors. Jumper J6. Sets the LTC6912 f or a dual or a single power supply operation. In a singl e suppl y operation, the AG ND pin of the LTC6912 is connected to V+/ 2 thru the Jumper J2: Sets the LTC6912 f or a dual PGA or a 2:1 J6 j umper and the V- input must be grounded external l y.
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DC861 QUICK START GUIDE Initial Setup Procedure: The f ollowi ng i s a n i ni t i a l set -up gui de t o t he f unc t i on of t he boa r d’ s j um per s, swi t c hes a nd c onnec t or s ( see F i gur e 4) . A.
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DC861 QUICK START GUIDE B. 2:1 Anal og M U X 1. Connect a DC861 board as shown in Figure 5. (J2-Dual, J6-M UX’ D, SW 1-D-O N , SW 2-O FF, SW 3-EN BL). 2. Set the power supply to ±5V and turn it on. 3.
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DC861 QUICK START GUIDE D . A 4:1 Anal og M U X PG A (D aisy Chain O peration of tw o D C861) Not e: I n a dai sy cha i n m ode, t he PGA set t i ngs ar e set i n hex and on SEND t he set t i ngs ar e shown i n deci m a l. 1.
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DC861 QUICK START GUIDE Figure 5. Dual PGA or 2:1 M UX Quick Set-Up (Dual Suppl y Operation) Oscil l oscope Note: Only one oscilloscope channel is required Sinew ave G enerator f or output monitoring in a 2:1 M UX operation. Connect generator output #1 #2 to I NA and I NB...
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DC861 QUICK START GUIDE Figure 7. Quad PGA or 4:1 M UX Daisy Chain Quick Set-Up (Dual Suppl y Operation) Connect: Note: Only one oscilloscope channel is required Out A of M aster to #1 Oscilloscope I nput f or output monitoring in a 4:1 M UX operation. Out B of M aster to #2 Oscilloscope I nput Out A of Slave to #3 Oscilloscope I nput Sinew ave G enerator...
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