Dual 16-bit 125Msps analog-to-digital conversion circuit designed with LTC2185

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

The LTC2185 is a dual 16-bit 125Msps low-power analog-to-digital converter (ADC) with two simultaneous sampling, 76.8dB SNR, 90dB SFDR, single-supply 1.8V operation, 185mW/154mW/100mW per channel, CMOS, DDR CMOS or DDR LVDS output, input range 1VP-P to 2VP-P, 550MHz full power bandwidth S/H, mainly used in communication, cellular base station, SDR, portable medical image, multi-channel data acquisition and non-destructive testing.
LTC2185 applications: communications; cellular base stations; software-defined radios; portable medical imaging; multi-channel data acquisition systems;
Main features of LTC2185: channel simultaneous sampling ADC; signal-to-noise ratio 76.8 dB; 90 dB SFDR; low power: 370 mW / 308 mW, 200 mW total; 185 mW, 154 mW / 100 mW per channel; single 1.8 V power supply; , CMOS, or DDR DDR LVDS output; select input range: 1 to 2 VP-P VP-P; 550 MHz full power bandwidth S / hour; optional data output Randomizer; optional clock cycle working stabilizer; , trim mode; SPI serial port configuration; (9 mm × 64 pin 9 mm) QFN package.

Figure 1. Block diagram of the LTC2185

Figure 2. LTC2185 uses a transformer 5MHz-700MHz analog input circuit diagram

Figure 3. Front-end circuit diagram of the LTC2185 input frequency from 5MHz to 150MHz

Figure 4. Front-end circuit diagram of the LTC2185 input frequency from 150MHz to 250MHz

Figure 5. LTC2185 front-end circuit diagram with input frequency greater than 250MHz

Figure 6. Front-end circuit diagram of the LTC2185 using a high-speed differential amplifier.

Figure 7. LTC2185 reference circuit diagram

Figure 8. LTC2185 application circuit diagram

Figure 9. LTC2185 application circuit PCB layout (top view)