11.2007 High Speed ADC Products High Performance Analog ICs High Speed ADC Products Contents 01 Introduction 02 LTC2209 High Performance ADC Family 03 LTC2207 High Performance ADC Family 04 LTC2220-1 and LTC2242-12 High IF Sampling ADC Families 05 LTC2224 High IF Sampling ADC Family 06 LTC2255 Lowest Power ADC Family 07 LTC2285 Lowest Power Dual ADC Family 08 LTC1750 High Performance 5V ADC Family 09 Fully Differential ADC Drivers 11 CMOS vs LVDS Outputs Lowest Power High Speed ADCs 16-Bit 14-Bit 12-Bit 10-Bit 125Msps to 135Msps 160Msps to 185Msps 10Msps 25Msps 40Msps 65Msps 80Msps 105Msps 2202 2203 2204 2205 2206 2207 2208 2209 2205-14 2206-14 2207-14 2208-14 2209-14 2245 2246 2247 2248 2249 2254 2255 2295 2296 2297 2298 2299 2284 2285 2223 2222 2224 2225 2226 2227 2228 2229 2252 2253 2290 2291 2292 2293 2294 2282 2283 2233 2232 2240-12 2220-1 2221 2237 2238 2239 2250 2251 2285 2287 2288 2289 2280 2281 2241-12 2242-10 2240-10 2231 2242-12 2220 2234 2236 210Msps and 250Msps 2230 2241-10 Lowest Power High Speed ADCs Introduction Our high speed ADCs offer the lowest power consumption and highest AC performance in the industry. They incorporate many unique features to ease system design and space constraints, including integrated bypass capacitance and integrated series resistance for 50ohm digital outputs. Each ADC family offers the ability to operate the digital output supply as low as 0.5V, helping to reduce digital feedback and allowing direct connection to low voltage digital interfaces. The entire ADC portfolio is supported with evaluation boards and a free Quick Eval-II PScope software tool that can be downloaded from our website at www.linear.com/company/software.jsp. The following tables provide a demo board selection guide for ADC evaluation. DC 851 DC 996 DC 890 02 LT C 2 2 0 9 A D C Family LTC2209 High Performance ADC Family • Internal Transparent Dither • Data Output Randomizer • Single 3.3V Supply • PGA Front End (1.5VP-P or 2.25VP-P ) • LVDS or CMOS Outputs • Data Ready Output Clock • Optional Clock Duty Cycle Stabilizer • 64-pin 9mm × 9mm QFN Package left: DC 996, right: DC 890 The LTC2209 is our highest performance ADC family, targeting the most demanding wideband, low noise, signal acquisition applications, while still offering the lowest power in the industry. The LTC2209 and LTC2207 families incorporate two unique features that simplify digital receiver design and improve system performance. The first is an internal transparent dither circuit that improves the ADC’s spurious free dynamic range (SFDR) response well beyond 100dBc for low level input signals. The second feature is a digital output randomizer that dramatically reduces unwanted tones caused by digital feedback. The DC854D demo board family offers CMOS output evaluation, while DC996B is configured for LVDS outputs. Applications: Software Defined Radio, Spectrum Analyzer, Oscilloscope, MRI, GPS, Avionics Instrumentation, Radar and Satellite Communications, Servowriter, CCD Tester, RFID, Disk Drive Tester, Radiography, RF Power Meter Part Number Resolution Speed SNR SFDR Full Power Bandwidth Power Dissipation LTC2209 16-Bit 160Msps 77.1dB 100dB 700MHz 1450mW LTC2208 16-Bit 130Msps 77.7dB 100dB 700MHz 1250mW LTC2209-14 14-Bit 160Msps 76.8dB 98dB 700MHz 1450mW LTC2208-14 14-Bit 130Msps 77.1dB 98dB 700MHz 1320mW CLKOUT OF D15 CLKOUT ANALOG INPUT AIN + AIN - LTC2208 ANALOG SUMMATION Σ S/H AMP 16-BIT PIPELINED ADC CORE DIGITAL SUMMATION OF OUTPUT DRIVERS D15 CLKOUT OF D15/DO DO D14 CLOCK/DUTY CYCLE CONTROL PRECISION DAC MULTIBIT DEEP PSEUDO-RANDOM NUMBER GENERATOR D2 RAND = HIGH, SCRAMBLE, ENABLED D1 D14/DO D2/DO D1/DO } DITH ENC+ ENC- DITHER ENABLE HIGH = DITHER ON LOW = DITHER OFF DO DO LT C 2 2 0 7 A D C Family LTC2207 High Performance ADC Family • Internal Transparent Dither • Data Output Randomizer • Single 3.3V Supply • PGA Front End • CMOS Outputs • Data Ready Output Clock • Clock Duty Cycle Stabilizer • 48-pin 7mm × 7mm QFN Package left: DC 919, right: DC 718 The LTC2202 through LTC2207 family of high speed ADCs use the DC718B USB board to interface between the demo board and a PC. Currently, two demo boards are available. The DC918C, with its AC-coupled analog inputs and differential clock input, targets the LTC2204 through the LTC2207. The DC919A offers the choice of DC- or AC-coupled analog inputs and has a single-ended clock input for the LTC2202/LTC2203. The LTC2205-LTC2207 ADCs can be evaluated using the DC-coupled DC919A, but the single-ended clock will slightly degrade performance. Applications: Oscilloscope, MRI, IR and CCD Cameras, Bomb Detection, Spectroscopy, Disk Drive Tester Part Number Resolution Speed SNR SFDR Full Power Bandwidth Power Dissipation LTC2207 16-Bit 105Msps 77.9dB 100dB 700MHz 900mW LTC2206 16-Bit 80Msps 77.9dB 100dB 700MHz 725mW LTC2205 16-Bit 65Msps 79.0dB 100dB 700MHz 610mW LTC2204 16-Bit 40Msps 79.1dB 100dB 700MHz 480mW LTC2203 16-Bit 25Msps 81.6dB 100dB 380MHz 220mW LTC2202 16-Bit 10Msps 81.6dB 100dB 380MHz 140mW LTC2207-14 14-Bit 105Msps 77.3dB 98dB 700MHz 947mW LTC2206-14 14-Bit 80Msps 77.3dB 98dB 700MHz 762mW LTC2205-14 14-Bit 65Msps 78.3dB 98dB 700MHz 600mW 03 04 02 LT C 2 2 2 0 - 1 and LT C 2 2 4 2 - 1 2 Families LTC2220-1 and LTC2242-12 High IF Sampling ADC Families • Single 3.3V or 2.5V Supply • LVDS or CMOS Outputs • Data Ready Output Clock • Selectable 1VP-P or 2VP-P Input Range • Clock Duty Cycle Stabilizer • 64-pin 9mm × 9mm QFN Package left: DC 997, right: DC 890 The 3.3V LTC2220-1 family is pin-compatible with the 2.5V LTC2242-12 family of ADCs, sampling up to 250Msps at 12 bits. The LTC2242-12 offers higher sampling rates at lower power dissipation for multichannel applications. With a 1.2GHz full power bandwidth, undersampling at IFs as high as 1GHz are achievable. The CMOS outputs can be demultiplexed by a factor of two to reduce the data rate for data collection and processing in FPGAs. Applications: Cable Headend Systems, CATV Return Path Digitizer, Power Amplifier Linearization, Data Acquisition, Disk Drive Tester, Multichannel Receivers, Radar and Jammers, GPS, High Definition Video, Laser Range Finders, Telemetry, Frequency Synthesizer, BTS Microwave Link, Wafer Defect Detection Part Number Resolution Speed SNR SFDR Full Power Bandwidth Power Dissipation LTC2220-1 12-Bit 185Msps 67.7dB 80dB 775MHz 910mW LTC2220 12-Bit 170Msps 67.7dB 84dB 775MHz 890mW LTC2221 12-Bit 135Msps 67.8dB 84dB 775MHz 660mW LTC2230 10-Bit 170Msps 61.2dB 78dB 775MHz 890mW LTC2231 10-Bit 135Msps 61.2dB 78dB 775MHz 660mW Part Number Resolution Speed SNR SFDR Full Power Bandwidth Power Dissipation LTC2242-12 12-Bit 250Msps 65.4dB 78dB 1.2GHz 740mW LTC2241-12 12-Bit 210Msps 65.5dB 78dB 1.2GHz 585mW LTC2240-12 12-Bit 170Msps 65.6dB 80dB 1.2GHz 445mW LTC2242-10 10-Bit 250Msps 60.6dB 78dB 1.2GHz 740mW LTC2241-10 10-Bit 210Msps 60.6dB 78dB 1.2GHz 585mW LTC2240-10 10-Bit 170Msps 60.6dB 80dB 1.2GHz 445mW LT C 2 2 2 4 A D C Family LTC2224 High IF Sampling ADC Family • Single 3.3V Supply • CMOS Outputs • Data Ready Output Clock • Selectable 1VP-P or 2VP-P Input Range • Clock Duty Cycle Stabilizer • 48-pin 7mm × 7mm QFN Package left: DC 751, right: DC 718 This high speed family is optimized for multicarrier wireless basestation transceiver applications for all major air interfaces including GSM, CDMA, WCDMA (UMTS), TD-SCDMA and WiMAX. Applications: PA Linearization, WiMAX Radio, Satellite Communications, CATV Return Path, Wireless Modem, Flow and Jitter Meters, Missile Guidance System, Plasma Generator, DVD Equipment, Battery Monitor, Fiber Optic Gyro, Blood Analyzer, Digital Oscilloscope Part Number Resolution Speed SNR SFDR Full Power Bandwidth Power Dissipation LTC2224 12-Bit 135Msps 67.6dB 84dB 775MHz 630mW LTC2222 12-Bit 105Msps 68.4dB 84dB 775MHz 475mW LTC2223 12-Bit 80Msps 68.5dB 84dB 775MHz 366mW LTC2222-11 11-Bit 105Msps 65.7dB 84dB 775MHz 475mW LTC2234 10-Bit 135Msps 61.2dB 78dB 775MHz 630mW LTC2232 10-Bit 105Msps 61.3dB 78dB 775MHz 475mW LTC2233 10-Bit 80Msps 61.3dB 78dB 775MHz 366mW 03 05 06 02 LT C 2 2 5 5 A D C Family LTC2255 Lowest Power ADC Family • Single 3V Supply • CMOS Outputs • Single-Ended Clock Input • Selectable 1VP-P or 2VP-P Input Range • Clock Duty Cycle Stabilizer • 32-pin 5mm × 5mm QFN Package left: DC 782, right: DC 718 The combination of high performance and low power makes this family ideal for battery-powered, test and measurement equipment. Applications: WiMAX, Software Defined Radio, CCD and Thermal Imaging, MRI Equipment, Industrial Camera, Ultrasound, Radar, Spectroscopy, Handheld Instrumentation, RFID Part Number Resolution Speed SNR SFDR Full Power Bandwidth Power Dissipation LTC2255 14-Bit 125Msps 72.5dB 88dB 640MHz 395mW LTC2254 14-Bit 105Msps 72.4dB 88dB 640MHz 320mW LTC2249 14-Bit 80Msps 73.0dB 90dB 575MHz 222mW LTC2248 14-Bit 65Msps 74.3dB 90dB 575MHz 204mW LTC2247 14-Bit 40Msps 74.4dB 90dB 575MHz 120mW LTC2246 14-Bit 25Msps 74.5dB 90dB 575MHz 75mW LTC2245 14-Bit 10Msps 74.4dB 90dB 575MHz 60mW LTC2253 12-Bit 125Msps 70.2dB 88dB 640MHz 395mW LTC2252 12-Bit 105Msps 70.2dB 88dB 640MHz 320mW LTC2229 12-Bit 80Msps 70.6dB 90dB 575MHz 211mW LTC2228 12-Bit 65Msps 71.3dB 90dB 575MHz 204mW LTC2227 12-Bit 40Msps 71.4dB 90dB 575MHz 120mW LTC2226 12-Bit 25Msps 71.4dB 90dB 575MHz 75mW LTC2225 12-Bit 10Msps 71.3dB 90dB 575MHz 60mW LTC2251 10-Bit 125Msps 61.6dB 85dB 640MHz 395mW LTC2250 10-Bit 105Msps 61.6dB 85dB 640MHz 320mW LTC2239 10-Bit 80Msps 61.6dB 85dB 575MHz 211mW LTC2238 10-Bit 65Msps 61.8dB 85dB 575MHz 204mW LTC2237 10-Bit 40Msps 61.8dB 85dB 575MHz 120mW LTC2236 10-Bit 25Msps 61.8dB 85dB 575MHz 75mW LT C 2 2 8 5 D ual A D C Family LTC2285 Lowest Power Dual ADC Family • Single 3V Supply • -110dB Channel-to-Channel Crosstalk • CMOS Outputs • Single-Ended Clock Input • Selectable 1VP-P or 2VP-P Input Range • Clock Duty Cycle Stabilizer • 64-pin 9mm × 9mm QFN Package left: DC 851, right: DC 890 The LTC2285 dual ADC family offers exceptionally low crosstalk between channels of -110dB, the best performance in the industry. Each ADC has a separate single-ended input clock, which is combined on the evaluation boards for ease of evaluation. The duals can be evaluated in their multiplexed output bus configuration using the DC816 family, but the MUX feature is limited to 65Msps per channel. The DC851 family demultiplexed (parallel) output demo board allows for evaluation of the entire family of dual ADCs. Applications: Antenna Diversity, RFID, WiMAX Basestation, Phased Array Multichannel Radio, Non-Destructive Testing, Software Defined Radio, Collision Avoidance Systems, Wireless Microphone, Night Vision Goggles, NTSC Video Digitizer Part Number Resolution Speed SNR SFDR Full Power Bandwidth Power Dissipation LTC2285 14-Bit 125Msps 72.4dB 88dB 640MHz 790mW LTC2284 14-Bit 105Msps 72.4dB 88dB 575MHz 540mW LTC2299 14-Bit 80Msps 73.0dB 90dB 575MHz 444mW LTC2298 14-Bit 65Msps 74.3dB 90dB 575MHz 400mW LTC2297 14-Bit 40Msps 74.4dB 90dB 575MHz 235mW LTC2296 14-Bit 25Msps 74.5dB 90dB 575MHz 150mW LTC2295 14-Bit 10Msps 74.4dB 90dB 575MHz 120mW LTC2283 12-Bit 125Msps 70.2dB 88dB 640MHz 790mW LTC2282 12-Bit 105Msps 70.1dB 88dB 575MHz 540mW LTC2294 12-Bit 80Msps 70.6dB 90dB 575MHz 422mW LTC2293 12-Bit 65Msps 71.3dB 90dB 575MHz 400mW LTC2292 12-Bit 40Msps 71.4dB 90dB 575MHz 235mW LTC2291 12-Bit 25Msps 71.4dB 90dB 575MHz 150mW LTC2290 12-Bit 10Msps 71.3dB 90dB 575MHz 120mW LTC2281 10-Bit 125Msps 61.6dB 85dB 640MHz 790mW LTC2280 10-Bit 105Msps 61.6dB 85dB 575MHz 540mW LTC2289 10-Bit 80Msps 61.6dB 85dB 575MHz 422mW LTC2288 10-Bit 65Msps 61.8dB 85dB 575MHz 400mW LTC2287 10-Bit 40Msps 61.8dB 85dB 575MHz 235mW LTC2286 10-Bit 25Msps 61.8dB 85dB 575MHz 150mW 07 03 08 02 LT C 1 7 5 0 A D C Family LTC1750 High Performance 5V ADC Family • Single 5V Supply • CMOS Outputs • Data Ready Output Clock • Selectable Input Ranges (Varied) • 48-pin TSSOP Package left: DC 520, right: DC 718 The LTC1750 and LTC1749 are high IF sampling ADCs up to 500MHz IF, while the rest of the family is best suited for IFs below 250MHz. This pin-compatible family provides excellent SNR performance from a 5V supply. Applications: PA Linearization, ATE, Instrumentation, Video Equipment, Particle Monitoring Equipment, Cardiac Ultrasound, CMOS Imaging, Digital Communications Simulator, Cell Sorter, Broadcast Camera, Data Acquisition Part Number Resolution Speed SNR SFDR Full Power Bandwidth Power Dissipation LTC1750 14-Bit 80Msps 75.5dB 90dB 500MHz 1450mW LTC1748 14-Bit 80Msps 76.3dB 90dB 240MHz 1400mW LTC1742 14-Bit 65Msps 76.5dB 90dB 240MHz 1275mW LTC1746 14-Bit 25Msps 77.5dB 91dB 240MHz 390mW LTC1749 12-Bit 80Msps 71.8dB 87dB 500MHz 1450mW LTC1747 12-Bit 80Msps 72.0dB 85dB 240MHz 1400mW LTC1741 12-Bit 65Msps 72.0dB 85dB 240MHz 1275mW LTC1743 12-Bit 50Msps 72.5dB 85dB 150MHz 1000mW LTC1745 12-Bit 25Msps 72.5dB 96dB 240MHz 380mW F ully D ifferential A D C D rivers Fully Differential ADC Drivers Linear Technology offers a wide range of fully differential amplifiers optimized for driving high-speed ADCs. They provide a wide variety of features, including built-in gain-setting resistors and integrated single pole filters, 4th order integrated filters, and the wide common mode input range. These amplifiers can also easily convert single-ended inputs to differential outputs. 16-bit LT1994 LT6404-X LT6600-X Resolution LT6402-X LT6411 LTC6406 LT1993-X LTC6401-X LTC6400-X DC 100MHz 200MHz 300MHz Input Frequency Range Product Input Frequency Range Gain Range Distortion HD2/HD3 Noise Is Vs Price (1,000 pcs) Features LT1994 DC to 2MHz Resistor-set -96dBc @ 1MHz 3 nV/√Hz 13.3mA 2.4V to 12.6V $1.65 RR Output LT6600-2.5 DC to 2.5MHz Resistor-set -88dBc @ 1MHz 23 nV/√Hz 26mA 3V to 11V $2.95 Integrated 4th order filter fc = 2.5MHz LT6600-5 DC to 5MHz Resistor-set -93dBc @ 1MHz 16 nV/√Hz 28mA 3V to 11V $2.95 Integrated 4th order filter fc = 5MHz LTC6403-1 DC to 5MHz Resistor-set -95dBc @ 3MHz 2.8 nV/√Hz 11mA 2.7V to 5.25V TBD RR Output LTC6404-1 DC to 10MHz Resistor-set -92dBc @ 10MHz 1.5 nV/√Hz 27mA 2.7V to 5.5V $3.44 RR Output LTC6404-2 DC to 15MHz Resistor-set -98dBc @ 10MHz 1.5 nV/√Hz 30mA 2.7V to 5.25V $3.44 Min Gain = 2V/V LT6600-10 DC to 10MHz Resistor-set -88dBc @ 1MHz 14 nV/√Hz 35mA 3V to 11V $2.95 Integrated 4th order filter fc = 10MHz LT6600-15 DC to 15MHz Resistor-set -86dBc @ 1MHz 19 nV/√Hz 35mA 3V to 11V $2.95 Integrated 4th order filter fc = 15MHz LT6600-20 DC to 20MHz Resistor-set -83dBc @ 2.5MHz 15 nV/√Hz 42mA 3V to 11V $2.95 Integrated 4th order filter fc = 20MHz LT6402-6 DC to 30MHz 6dB -84dBc @ 25MHz 3.9 nV/√Hz 30mA 4V to 5.5V $2.39 1st order filter LT6402-12 DC to 30MHz 12dB -82dBc @ 25MHz 2.6 nV/√Hz 30mA 4V to 5.5V $2.39 1st order filter LT6402-20 DC to 30MHz 20dB -80dBc @ 25MHz 1.9 nV/√Hz 30mA 4V to 5.5V $2.39 1st order filter LT6411 DC to 50MHz 0dB, 6dB -76dBc @ 10MHz 7.7 nV/√Hz 8mA 4.5V to 12.5V $2.39 Fixed Gain LTC6406 DC to 50MHz Resistor-set -72dBc @ 50MHz 1.6 nV/√Hz 18mA 2.7V to 3.5V $3.44 RR Input LT1993-2 DC to 70MHz 6dB -70dBc @ 70MHz 3.8 nV/√Hz 100mA 4V to 5.5V $2.95 1st order filter LT1993-4 DC to 70MHz 12dB -73dBc @ 70MHz 2.4 nV/√Hz 100mA 4V to 5.5V $2.95 1st order filter LT1993-10 DC to 70MHz 20dB -70dBc @ 70MHz 1.9 nV/√Hz 100mA 4V to 5.5V $2.95 1st order filter LTC6401-8 DC to 140MHz 8dB -87dBc @ 70MHz 3.2 nV/√Hz 45mA 2.85V to 3.5V $2.95 1st order filter LTC6401-20 DC to 140MHz 20dB -88dBc @ 70MHz 2.1 nV/√Hz 50mA 2.85V to 3.5V $2.95 1st order filter LTC6401-26 DC to 140MHz 26dB -81dBc @ 70MHz 1.5 nV/√Hz 45mA 2.85V to 3.5V $2.95 1st order filter LTC6400-20 DC to 300MHz 20dB -76dBc @ 140MHz 2.1 nV/√Hz 90mA 2.85V to 3.5V $3.20 1st order filter LTC6400-26 DC to 300MHz 26dB -81dBc @ 140MHz 1.5 nV/√Hz 85mA 2.85V to 3.5V $3.20 1st order filter 09 03 10 02 F ully D ifferential A D C D rivers LTC6400 High Speed Fully Differential ADC Driver Family Integrated Gain-Setting Resistors: • LTC6400-8 8dB • LTC6400-14 14dB • LTC6400-20 20dB • LTC6400-26 26dB High Performance (LTC6400-20): • 1.8GHz GBW • 4500V/us Slew Rate • 41 dBm OIP3 @ 240MHz • -74dBc IMD3 @ 240MHz • 1.9nV/√Hz Op Amp Noise • Integrated First-Order Filter • Independent Output Common Mode Control • 3mm × 3mm QFN package • Lower power, Lower Speed LTC6401 available LTC6400 The LTC6400 high-speed fully differential amplifier family achieves high performance while simplifying system design. Capable of driving up to 300MHz signals with low noise and distortion, the LTC6400 has integrated gain-setting resistors, adjustable output filtering, and flexible I/O coupling. This integration maximizes performance and simplifies board design. Fully specified at 3V supply, the LTC6400 can often share the same supply rail with the ADC. LTC6404-1 High-Resolution Fully Differential ADC Driver Family • Low Noise: 1.5nV/√Hz • Very Low Distortion: < -90dBc @ 10MHz • Closed Loop -3dB Bandwidth: 600MHz • 450V/us Slew Rate • Independent Output Common Mode Control • 3mm × 3mm QFN package • Lower power, Lower Speed LTC6403 available • 2.7V to 5.25V Supply Voltage Range LTC6404 The LTC6404-1 is capable of driving 10MHz input signals into today’s state-of-the-art high-speed 14- to 18-bit ADCs while operating on the same supply voltage. It draws only 27mA and features a hardware shutdown mode which reduces current consumption to 0.25mA. C M O S vs LV D S O utputs CMOS vs LVDS Outputs Low-Voltage Differential Signaling (LVDS) is often preferred as a means to reduce ground currents and radiated noise when sampling at speeds greater than 100Msps. LVDS allows for good common-mode noise rejection at the digital receiver and faster switching rates. The lower signaling levels allow properly terminated transmission paths which are of paramount importance in maintaining good signal integrity. CMOS obliges you to use source termination (provided internally on Linear Technology high-speed ADCs) but this is still not ideal as there is some lumped capacitance after the internal resistor. Single-ended CMOS outputs have longer rise and fall times that limit the maximum bit rate due to the larger voltage swing and are potentially more sensitive to crosstalk and above all, ground bounce. However, LVDS is not completely immune to noise. The CMRR of receivers is not more than 20-30dB at higher frequencies, and the signaling levels are lower. Adjacent lines routed in close proximity will still result in crosstalk. The presence of a high level CMOS signal routed alongside an LVDS pair will potentially compromise signal integrity. In addition, high speed ADCs using LVDS can require up to a quarter Watt more power than CMOS. An advantage of Linear Technology’s high-speed ADCs is the ability to reduce the digital output supply (OVDD ) as low as 0.5V for running low-voltage CMOS outputs. Lowering the CMOS levels greatly reduces the resulting noise and also helps reduce digital feedback. For routing short distances, buffering can be eliminated at the ADC output for direct connection to an FPGA or DSP without discernable performance degradation compared to LVDS. However, if there is ground bounce in the FPGA as a result of activity at asynchronous or subharmonic frequencies, the elimination of buffers may allow noise to be injected back into the ADC. Another technique that can be used to reduce digital noise is to configure the part in a Pseudo-LVDS output mode where the outputs are configured as CMOS but OVDD is biased at 1.4V and OGND at 1V (see Figure 1). The outputs are then run into a standard LVDS receiver. This requires a bypassed 1.2V reference voltage near the ADC, and needs to represent similar source impedance to the driven line at the receiver. If these lines are routed over a belt of copper that is biased at the ADC, it may offer many of the advantages of LVDS without the power consumption in the ADC. Figure 1 also shows the integrated series resistance included on every digital output so that each output appears as 50ohms. LTC2284 OVDD 1.4V 0.1uF LVDS Receiver 1K 43ohm 50ohm Transmission Line IN+ 1.2V OGND 1.0V 0.1uF 0.1uF Close and Same Ground Figure 1. 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