LTC6912 Dual Programmable Gain Amplifiers with Serial Digital Interface FEATURES DESCRIPTIO 2 Channels with Independent Gain Control The LTC 6912 is a family of dual channel, low noise, LTC6912-1: (0, 1, 2, 5, 10, 20, 50, and 100V/V) digitally programmable gain amplifiers (PGA) that are LTC6912-2: (0, 1, 2, 4, 8, 16, 32, and 64V/V) easy to use and occupy very little PC board space. The Offset Voltage = 2mV Max (40C to 85C) gains for both channels are independently programmable Channel-to-Channel Gain Matching of 0.1dB Max using a 3-wire SPI interface to select voltage gains of 0, 1, TM 3-Wire SPI Interface 2, 5, 10, 20, 50, and 100V/V (LTC6912-1 ) and 0, 1, 2, 4, Extended Gain-Bandwidth at High Gains 8, 16, 32, and 64V/V (LTC6912-2). All gains are inverting. Wired-OR Outputs Possible (2:1 Analog MUX The LTC6912 family consists of 2 matched amplifiers with Function) rail-to-rail outputs. When operated with unity gain, they Low Power Hardware Shutdown (GN-16 Only, will also process rail-to-rail input signals. A half-supply 2A Max at 2.7V) reference generated internally at the AGND pin supports Rail-to-Rail Input Range single power supply applications. Operating from single Rail-to-Rail Output Swing or split supplies from 2.7V to 10.5V total, the LTC6912-X Single or Dual Supply: 2.7V to 10.5V Total family is offered in tiny SSOP and DFN-12 Packages. Input Noise: 12.6nV/Hz Total System Dynamic Range to 115dB 16-Pin GN (SSOP) or 12-Pin DFN Package Options , LTC and LT are registered trademarks of Linear Technology Corporation. U All other trademarks are the property of their respective owners. APPLICATIO S Data Acquisition Systems Dynamic Gain Changing Automatic Ranging Circuits Automatic Gain Control TYPICAL APPLICATIO A Dual, Matched Low Noise PGA (16-Lead SSOP Package) 3V 0.1F LTC6912-2 12 14 Frequency Response + V V 40 V = 2.5V GAIN OF 64 S V = 10mV IN RMS 2 INA OUT A 15 V V = GAIN V INA OUTA A INA GAIN OF 32 30 1F GAIN OF 16 3 LTC6912-X AGND 20 GAIN OF 8 GAIN OF 4 4 INB OUT B 13 10 V V = GAIN V INB OUTB B INB GAIN OF 2 GAIN OF 1 0 10 CHB CHA 5 0.1 1 10 100 1000 10000 SHDN SHDN 10 DGND 6 FREQUENCY (kHz) CS/LD CS/LD 3-WIRE 7 6912 TA01b SPI DATA D IN 9 D 8 OUT INTERFACE CLK 6912 TA01a 6912fa 1 GAIN (dB) U ULTC6912 ABSOLUTE AXI U RATI GS (Note 1) Specified Temperature Range (Note 3) + Total Supply Voltage (V to V ) ............................... 11V LTC6912C-1, LTC6912C-2 ..................40C to 85C Input Current ...................................................... 10mA LTC6912I-1, LTC6912I-2.....................40C to 85C Operating Temperature Range (Note 2) LTC6912H-1, LTC6912H-2 LTC6912C-1, LTC6912C-2 ..................40C to 85C (GN-16 Only) .....................................40C to 125C LTC6912I-1, LTC6912I-2.....................40C to 85C Storage Temperature Range ..................65C to 150C LTC6912H-1, LTC6912H-2 UE Package ....................................... 65C to 125C (GN-16 Only) .....................................40C to 125C Lead Temperature (Soldering, 10sec)................... 300C UUW PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW NC 1 16 NC INA 1 12 OUTA INA 2 15 OUT A AGND 2 11 V AGND 3 14 V INB 3 10 OUTB 13 INB 4 13 OUT B + CS/LD 4 9 V + SHDN 5 12 V DIN 5 8 DGND CS/LD 6 11 NC CLK 6 7 DOUT D 7 10 DGND IN UE12 PACKAGE CLK 8 9 D OUT 12-LEAD (4mm 3mm) PLASTIC DFN EXPOSED PAD IS CONNECTED TO V (PIN 13), GN PACKAGE MUST BE SOLDERED TO PCB 16-LEAD NARROW PLASTIC SSOP T = 125C, = 160C/W T = 150C, = 120C/W JMAX JA JMAX JA ORDER PART DFN PART* ORDER PART GN PART NUMBER MARKING NUMBER MARKING LTC6912CGN-1 69121 LTC6912CDE-1 69121 LTC6912IGN-1 6912I1 LTC6912IDE-1 69121 LTC6912HGN-1 6912H1 LTC6912CDE-2 69122 LTC6912CGN-2 69122 LTC6912IDE-2 69122 LTC6912IGN-2 6912I2 LTC6912HGN-2 6912H2 Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: