ltc2216 Linear Technology Corporation, ltc2216 Datasheet
ltc2216
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ltc2216 Summary of contents
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... A/D converters designed for digitizing high frequency, wide dynamic range signals with input frequencies up to 400MHz. The input range of the ADC is fi xed at 2.75V The LTC2216/LTC2215 are perfect for demanding com- munications applications, with AC performance that includes 81.5dBFS noise fl oor and 100dB spurious free dynamic range (SFDR) ...
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... Analog Input Voltage (Note 3) ..... –0. Digital Input Voltage .................... –0. Digital Output Voltage ................–0.3V to (OV Power Dissipation .............................................2000mW Operating Temperature Range LTC2215C/LTC2216C ............................... 0°C to 70°C LTC2215I/LTC2216I ..............................–40°C to 85°C Storage Temperature Range ..................–65°C to 150°C ORDER INFORMATION LEAD FREE FINISH ...
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... ≤ SENSE ≤ – Sample Mode ENC < ENC + – Hold Mode ENC > ENC + – 1.2V < <1. < 25Ω S LTC2216/LTC2215 MIN TYP MAX l ±1.2 ±3.5 l 0.16/–0.2 ±1 l ±1.5 ±8 ±4 l ±0.3 ±1 –65 ±12 2 MIN TYP MAX 2. ...
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... IN = 25° 25° 25° 25° 25° 25° 25° 14MHz 21MHz, –7dBFS IN1 IN2 = 67MHz 74MHz, –7dBFS IN1 IN2 LTC2215 LTC2216 MIN TYP MAX MIN TYP 81.5 81.3 80.8 81.4 80.6 81.2 l 80.5 81 80.2 80.8 81.2 81.1 80 80.6 80 80.5 l 79.7 80 ...
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... 3. 1.60mA DD O 100Ω Differential Load 100Ω Differential Load 100Ω Differential Load 100Ω Differential Load LTC2216/LTC2215 l denotes the specifi cations which apply over the MIN TYP MAX l 1.475 1.575 1.675 ±60 2.4 1.1 denotes the specifi cations which apply over the ...
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... LTC2215 LTC2216 MIN TYP MAX MIN TYP MAX 7.31 7.692 500 5.94 6.25 500 5 7.692 500 4.06 6.25 500 7.31 7.692 500 5.94 6.25 500 5 7.692 500 4 ...
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... Note 3: When these pin voltages are taken below GND or above V will be clamped by internal diodes. This product can handle input currents of greater than 100mA below GND or above V Note 3.3V 65MHz (LTC2215) or 80MHz (LTC2216), LVDS DD SAMPLE + – outputs, differential ENC ...
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... LTC2216/LTC2215 TIMING DIAGRAMS ANALOG INPUT – ENC + ENC DA0-DA15, OFA CLKOUTA CLKOUTB DB0-DB15, OFB ANALOG INPUT – ENC + ENC DA0-DA15, OFA DB0-DB15, OFB CLKOUTA CLKOUTB 8 Full-Rate CMOS Output Mode Timing All Outputs are Single-Ended and Have CMOS Levels ...
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... FREQUENCY (MHz) 22165 G06 LTC2216 64k Point 2-Tone FFT 14.25MHz and 21.5MHz, IN –7dBFS 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 0 ...
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... FREQUENCY (MHz) 22165 G14 LTC2216 SFDR vs Input Level 70.5MHz, Dither “Off” IN 140 130 120 110 100 –80 –70 –60 –50 –40 –30 ...
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... FREQUENCY (MHz) LTC2216 SFDR vs Input Level 140.5MHz, Dither “On” IN 140 130 120 110 100 –80 –70 –60 –50 –40 –30 –20 ...
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... HD2 105 100 95 HD3 SFDR 100 150 200 250 INPUT FREQUENCY (MHz) 22165 G28 LTC2216 SNR and SFDR vs Supply Voltage (V DD 110 LOWER LIMIT 105 100 95 SFDR 90 85 SNR 2.8 3.0 SUPPLY VOLTAGE (V) LTC2216 SNR and SFDR vs Clock Duty Cycle, f ...
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... Dither “On” 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 FREQUENCY (MHz) 22165 G49 LTC2216/LTC2215 LTC2215 Differential Nonlinearity (DNL) vs Output Code 1.0 0.8 0.6 0.4 0.2 0.0 –0.2 –0.4 –0.6 –0.8 –1.0 0 16384 32768 49152 65536 OUTPUT CODE 22165 G44 ...
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... LTC2216/LTC2215 TYPICAL PERFORMANCE CHARACTERISTICS LTC2215 64k Point 2–Tone FFT 14.25MHz and 21.5MHz, IN –25dBFS, Dither “On” 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 FREQUENCY (MHz) 22165 G51 LTC2215 SNR vs Input Level 15.2MHz IN 82 ...
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... Dither “On” IN 140 130 120 110 100 INPUT LEVEL (dBFS) 22165 G67 LTC2216/LTC2215 LTC2215 64k Point 2–Tone FFT 67.2MHz and 74.4MHz, –7dBFS 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130 ...
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... LTC2216/LTC2215 TYPICAL PERFORMANCE CHARACTERISTICS LTC2215 SFDR (HD2 and HD3) vs Input Frequency 110 105 HD3 100 95 HD2 90 SFDR 100 150 200 INPUT FREQUENCY (MHz) 22165 G69 LTC2215 SNR and SFDR vs Supply Voltage ( 110 LOWER LIMIT 105 100 95 SFDR ...
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... Voltage vs Temperature, External Reference, 5 Units –1 –2 –3 –4 –5 –40 – TEMPERATURE (°C) 22165 G79 LTC2216/LTC2215 Input Offset Voltage vs Temperature, Internal Reference, 5 Units –1 –2 –3 –4 –5 –40 – TEMPERATURE (°C) 22165 G77 LTC2216/LTC2215 Mid– ...
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... LTC2216/LTC2215 PIN FUNCTIONS For CMOS Mode. Full Rate or Demultiplexed SENSE (Pin 1): Reference Mode Select and External Refer- ence Input. Tie SENSE select the internal 2.5V DD bandgap reference. An external reference of 2.5V or 1.25V may be used; both reference values will set a full-scale ADC range of 2.75V. ...
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... LTC2208 this pin should be connected to GND required. Otherwise no connection. DD GND (Exposed Pad Pin 65): ADC Power Ground. The exposed pad on the bottom of the package must be sol- dered to ground. LTC2216/LTC2215 (Pins 39 and 40): LVDS Data Valid + , falling selects offset DD selects 2’s complement DD selects 2’ ...
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... LTC2216/LTC2215 BLOCK DIAGRAM + A IN INPUT FIRST PIPELINED S/H ADC STAGE – DITHER SIGNAL GENERATOR RANGE SELECT SENSE PGA V CM BUFFER VOLTAGE REFERENCE 20 SECOND PIPELINED THIRD PIPELINED FOURTH PIPELINED ADC STAGE ADC STAGE ADC CLOCKS DIFFERENTIAL ADC INPUT CONTROL REFERENCE LOW JITTER ...
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... This random variation will result in noise when sampling an AC input. The signal-to-noise ratio term due to the jitter alone will be: SNR JITTER This formula states SNR due to jitter alone at any ampli- tude in terms of dBc. LTC2216/LTC2215 + – equals the ENC = –20log (2π • f • ...
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... SAMPLE/HOLD OPERATION AND INPUT DRIVE Sample/Hold Operation Figure 2 shows an equivalent circuit for the LTC2216/ LTC2215 CMOS differential sample and hold. The differ- ential analog inputs are sampled directly onto sampling capacitors (C ...
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... Transformer Coupled Circuits Figure 3 shows the LTC2216/LTC2215 being driven transformer with a center-tapped secondary. The secondary center tap is DC biased with V ADC input signal at its optimum DC level. Figure 3 shows a 1:1 turns ratio transformer. Other turns ratios can be used ...
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... Figure 5. DC Coupled Input with Differential Amplifi er Reference Operation Figure 6 shows the LTC2216/LTC2215 reference circuitry consisting of a 2.5V bandgap reference, a programmable gain amplifi er and control circuit. The LTC2216/LTC2215 has three modes of reference operation: Internal Refer ence, 1.25V external reference or 2.5V external reference. ...
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... Figure 7. A 2.75V Range ADC with an External 2.5V Reference Driving the Encode Inputs The noise performance of the LTC2216/LTC2215 can depend on the encode signal quality as much as on the analog input. The encode inputs are intended to be driven differentially, primarily for noise immunity from common mode noise sources ...
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... For the ADCs to operate properly the encode signal should have a 50% (±5%) duty cycle. Each half cycle must have at least 5.94ns for the LTC2216 internal circuitry to have enough settling time for proper operation. For the LTC2215, each half cycle must be at least 7.31ns. Achieving a pre- ...
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... OV DD Data Format TYPICAL 43Ω DATA The LTC2216/LTC2215 parallel digital output can be OUTPUT selected for offset binary or 2’s complement format. The format is selected with the MODE pin. This pin has a four OGND level logic input, centered at 0, 1/3V 22165 F12 ...
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... To decode, the reverse operation is applied; that is, an exclusive-OR operation is applied between the LSB and all other bits. The LSB, OF and CLKOUT output 28 are not affected. The output Randomizer function is active when the RAND pin is high. LTC2216/LTC2215 CLKOUT OF D15 D14 D2 ...
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... ENC Figure 16. Functional Equivalent Block Diagram of Internal Dither Circuit Internal Dither The LTC2216/LTC2215 is a 16-bit ADC with a very linear transfer function; however, at low input levels even slight imperfections in the transfer function will result in unwanted tones. Small errors in the transfer function are usually a result of ADC element mismatches ...
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... LTC2216/LTC2215 APPLICATIONS INFORMATION Grounding and Bypassing The LTC2216/LTC2215 requires a printed circuit board with a clean unbroken ground plane; a multilayer board with an internal ground plane is recommended. The pinout of the LTC2216/LTC2215 has been optimized for a fl owthrough layout so that the interaction between inputs and digital outputs is minimized ...
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... APPLICATIONS INFORMATION Layer 1 Component Side LTC2216/LTC2215 Layer 2 GND Plane 22165f 31 ...
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... LTC2216/LTC2215 APPLICATIONS INFORMATION Layer 3 GND 32 Layer 4 GND 22165f ...
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... APPLICATIONS INFORMATION Layer 5 GND LTC2216/LTC2215 Layer 6 Bottom Side 22165f 33 ...
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... LTC2216/LTC2215 APPLICATIONS INFORMATION VC5 48 VC4 47 VC3 26 VC2 25 VC1 12 OVDD49 49 OGND50 50 D12– 51 D12+ 52 D13– 53 D13+ 54 D14– 55 D14+ 56 D15– 57 D15+ 58 OF– 59 OF+ 60 LVDS 61 MODE 62 RAND • • 34 VE5 VC5 37 48 VE4 VC4 36 47 VE3 VC3 23 26 VE2 ...
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... Plastic QFN (9mm × 9mm) (Reference LTC DWG # 05-08-1705) 0.70 ±0.05 7.50 REF 8.10 ±0.05 9.50 ±0.05 (4 SIDES) PACKAGE OUTLINE 0.25 ±0.05 0.75 ± 0. 0.10 TYP 7.50 REF (4-SIDES) 0.200 REF 0.00 – 0.05 LTC2216/LTC2215 R = 0.115 TYP 63 64 PIN 1 CHAMFER C = 0.35 7.15 ± 0.10 7.15 ± 0.10 (UP64) QFN 0406 REV C 0.25 ± 0.05 0.50 BSC BOTTOM VIEW—EXPOSED PAD 35 0.40 ± ...
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... LTC2216/LTC2215 RELATED PARTS PART NUMBER DESCRIPTION LT1993 High Speed Differential Op Amp LTC2202 16-Bit, 10Msps ADC LTC2203 16-Bit, 25Msps ADC LTC2204 16-Bit, 40Msps ADC LTC2205 16-Bit, 65Msps ADC LTC2206 16-Bit, 80Msps ADC LTC2207 16-Bit, 105Msps ADC LTC2208 16-Bit, 130Msps ADC LTC2209 16-Bit, 160Msps ADC ...