LTC1609 16-Bit, 200ksps, Serial ADC with Multiple Input Ranges UFEATURESDESCRIPTIO ■ Sample Rate: 200ksps The LTC®1609 is a 200ksps, serial sampling 16-bit A/D ■ Input Ranges converter that draws only 65mW (typical) from a single 5V Unipolar: 0V to 10V, 0V to 5V and 0V to 4V supply. This easy-to-use device includes a sample-and- Bipolar: ± 10V, ± 5V and ± 3.3V hold, a precision reference, a switched capacitor succes- ■ Guaranteed No Missing Codes sive approximation A/D and trimmed internal clock. ■ Serial I/O The input range is specified for bipolar inputs of ±10V, ■ Single 5V Supply ±5V and ±3.3V and unipolar inputs of 0V to 10V, 0V to 5V ■ Power Dissipation: 65mW Typ and 0V to 4V. Maximum DC specs include ±2LSB INL and ■ Power Down Mode: 50µW 16-bit no missing codes over temperature. It has a typical ■ SNR: 87dB Typ signal-to-noise ratio of 87dB. ■ Operates with Internal or External Reference ■ 28-Pin SSOP and 20-Pin SO Packages The ADC has a high speed serial interface. The serial ■ Improved 2nd Source to ADS7809 and AD977A output data can be clocked out using either the internal U serial shift clock or be clocked out by an external shift APPLICATIO S clock. A separate convert start input (R/C) and a data ready signal (BUSY) ease connections to FIFOs, DSPs and ■ Industrial Process Control microprocessors. ■ Multiplexed Data Acquisition Systems , LTC and LT are registered trademarks of Linear Technology Corporation. ■ High Speed Data Acquisition for PCs ■ Digital Signal Processing UTYPICAL APPLICATIO200kHz, 16-Bit Serial Sampling ADC Configured for ± 10V Inputs 200Ω 1 28 ANALOG INPUT R1IN VDIG 5V – 10V TO 10V 2 27 + Nonaveraged 4096 Point FFT Plot AGND1 VANA 10µF 0.1µF 100Ω 3 26 0 R2IN PWRD 33.2k f 4 25 SAMPLE = 200kHz R3IN BUSY f –20 IN = 1kHz 5 24 SINAD = 87.2dB NC CS THD = –100.1dB 2.5V 6 LTC1609 23 CAP NC + –40 2.5V 7 22 2.2µF REF NC + 8 21 –60 2.2µF NC R/C 9 20 AGND2 NC –80 10 19 MAGNITUDE (dB) NC TAG 11 18 SERIAL INTERFACE –100 NC NC 12 17 SB/BTC DATA –120 13 16 EXT/INT DATACLK –130 14 15 0 25 50 75 100 DGND SYNC FREQUENCY (kHz) 1609 TA01 1609 G06 1609fa 1