Linear Technology LTC2173-12 Скачать руководство пользователя страница 17

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21754312fa

LTC2175-12/

LTC2174-12/LTC2173-12

pin FuncTions

REF

(Pin 48): Reference Voltage Output. Bypass to ground

with a 1µF ceramic capacitor, nominally 1.25V.
SENSE (Pin 50): Reference Programming Pin. Connecting

SENSE to V

selects the internal reference and a ±1V input

range. Connecting SENSE to ground selects the internal

reference and a ±0.5V input range. An external reference

between 0.625V and 1.3V applied to SENSE selects an

input range of ±0.8 • V

SENSE

LVDS Outputs
All pins in this section are differential LVDS outputs.

The output current level is programmable. There is an

optional internal 100Ω termination resistor between

the pins of each LVDS output pair.
OUT4B

–

/OUT4B

, OUT4A

–

/OUT4A

(Pins 23/24,

Pins 25/26): Serial data outputs for Channel 4. In 1-lane

output mode only OUT4A

–

/OUT4A

are used.

OUT3B

–

/OUT3B

, OUT3A

–

/OUT3A

(Pins 27/28,

Pins 29/30): Serial data outputs for Channel 3. In 1-lane

output mode only OUT3A

–

/OUT3A

are used.

–

/FR

(Pins 31/32): Frame Start Outputs.

DCO

–

/DCO

(Pins 35/36): Data Clock Outputs.

OUT2B

–

/OUT2B

, OUT2A

–

/OUT2A

(Pins 37/38,

Pins 39/40): Serial data outputs for Channel 2. In 1-lane

output mode only OUT2A

–

/OUT2A

are used.

OUT1B

–

/OUT1B

, OUT1A

–

/OUT1A

(Pins 41/42,

Pins 43/44): Serial data outputs for Channel 1. In 1-lane

output mode only OUT1A

–

/OUT1A

are used.

Содержание LTC2173-12

Страница 1: ...ave PECL LVDS TTL or CMOS inputs An internal clock duty cycle stabilizer al lows high performance at full speed for a wide range of clock duty cycles n 4 Channel Simultaneous Sampling ADC n 70 6dB SNR...

Страница 2: ...ting for information on non standard lead based finish parts For more information on lead free part marking go to http www linear com leadfree For more information on tape and reel specifications go t...

Страница 3: ...2 FS Offset Matching 3 3 3 mV Transition Noise External Reference 0 3 0 3 0 3 LSBRMS Analog Input The l denotes the specifications which apply over the full operating temperature range otherwise speci...

Страница 4: ...put 140MHz Input l 84 90 90 90 84 90 90 90 85 90 90 90 dBFS dBFS dBFS S N D Signal to Noise Plus Distortion Ratio 5MHz Input 70MHz Input 140MHz Input l 68 6 70 6 70 4 70 68 7 70 6 70 4 70 68 9 70 6 70...

Страница 5: ...V RIN Input Resistance See Figure 11 30 k CIN Input Capacitance 3 5 pF DIGITAL INPUTS CS SDI SCK in Serial or Parallel Programming Mode SDO in Parallel Programming Mode VIH High Level Input Voltage V...

Страница 6: ...at TA 25 C Note 5 SYMBOL PARAMETER CONDITIONS LTC2175 12 LTC2174 12 LTC2173 12 UNITS MIN TYP MAX MIN TYP MAX MIN TYP MAX fS Sampling Frequency Notes 10 11 l 5 125 5 105 5 80 MHz tENCL ENC Low Time No...

Страница 7: ...mped by internal diodes This product can handle input currents of greater than 100mA below GND without latchup Note 5 VDD OVDD 1 8V fSAMPLE 125MHz LTC2175 105MHz LTC2174 or 80MHz LTC2173 2 lane output...

Страница 8: ...SOFTWARE COMPATIBILITY WITH THE 14 BIT VERSIONS OF THESE A Ds DURING NORMAL NON OVERRANGED OPERATION DX AND DY ARE SET TO LOGIC 0 SEE THE DATA FORMAT SECTION FOR MORE DETAILS Timing Diagrams 2 Lane O...

Страница 9: ...FR FR D6 D4 D2 D0 D10 D8 D6 D4 D2 D0 D10 D8 D6 OUT B OUT B ANALOG INPUT ENC ENC DCO DCO tAP tENCH tENCL tSER tPD tDATA tFRAME SAMPLE N 6 SAMPLE N 5 SAMPLE N 4 N 1 N tSER tSER 217512 TD05 DX DY DX DY 0...

Страница 10: ...ING NORMAL NON OVERRANGED OPERATION DX AND DY ARE SET TO LOGIC 0 SEE THE DATA FORMAT SECTION FOR MORE DETAILS One Lane Output Mode 12 Bit Serialization ANALOG INPUT ENC ENC DCO DCO tAP tENCH tENCL tSE...

Страница 11: ...sps LTC2175 12 8k Point FFT fIN 140MHz 1dBFS 125Msps LTC2175 12 8k Point 2 Tone FFT fIN 70MHz 75MHz 1dBFS 125Msps LTC2175 12 Shorted Input Histogram FREQUENCY MHz 0 100 110 120 70 60 80 90 AMPLITUDE d...

Страница 12: ...ity DNL LTC2174 12 8k Point FFT fIN 5MHz 1dBFS 105Msps SENSE PIN V 0 6 71 68 69 70 67 66 72 SNR dBFS 0 7 0 8 0 9 1 1 1 2 1 3 1 217512 G15 OUTPUT CODE 0 1 0 0 4 0 6 0 8 INL ERROR LSB 0 2 0 0 2 0 4 0 6...

Страница 13: ...50 300 350 217512 G23a LTC2174 12 SNR vs Input Frequency 1dB 2V Range 105Msps LTC2174 12 SFDR vs Input Frequency 1dB 2V Range 105Msps LTC2174 12 8k Point FFT fIN 70MHz 1dBFS 105Msps LTC2174 12 8k Poin...

Страница 14: ...DE 0 1 0 0 4 0 2 0 6 0 8 DNL ERROR LSB 0 0 4 0 2 0 6 0 8 1 0 1024 2048 3072 4096 217512 G42 FREQUENCY MHz 0 100 110 120 70 60 80 90 AMPLITUDE dBFS 50 30 40 20 10 0 10 20 30 40 217512 G43 FREQUENCY MHz...

Страница 15: ...S 80 60 50 40 30 20 10 0 80 70 SFDR dBc AND dBFS 90 100 110 70 60 50 40 30 20 10 0 217512 G52 dBFS dBc INPUT FREQUENCY MHz 0 90 85 80 75 70 65 95 SFDR dBFS 50 100 150 200 250 300 350 217512 G35a LTC21...

Страница 16: ...amming mode PAR SER 0V SCK is the serial interface clock input In the parallel programmingmode PAR SER VDD SCKselects3 5mA or 1 75mA LVDS output currents SCK can be driven with 1 8V to 3 3V logic SDI...

Страница 17: ...t current level is programmable There is an optional internal 100 termination resistor between the pins of each LVDS output pair OUT4B OUT4B OUT4A OUT4A Pins 23 24 Pins 25 26 Serial data outputs for C...

Страница 18: ...S H SENSE VREF 1 F 0 1 F 12 BIT ADC CORE 12 BIT ADC CORE 12 BIT ADC CORE 12 BIT ADC CORE OVDD 1 8V ENC ENC PLL OUT1A OUT1A OUT1B OUT1B OUT2A OUT2A OUT2B OUT2B DATA CLOCK OUT DATA CLOCK OUT OUT3A OUT3...

Страница 19: ...d swing from VCM 0 5V to VCM 0 5V There should be 180 phase difference between the inputs Thefourchannelsaresimultaneouslysampledbyashared encode circuit Figure 2 INPUT DRIVE CIRCUITS Input Filtering...

Страница 20: ...A 007159 000000 T2 COILCRAFT WBC1 1LB RESISTORS CAPACITORS ARE 0402 PACKAGE SIZE 217512 F05 LTC2175 12 25 25 50 0 1 F 2 7nH 2 7nH AIN AIN 0 1 F VCM ANALOG INPUT 0 1 F 0 1 F T1 T1 MA COM ETC1 1 13 RESI...

Страница 21: ...ackside of the circuit board Encode Input The signal quality of the encode inputs strongly affects the A D noise performance The encode inputs should be treated as analog signals do not route them nex...

Страница 22: ...3 6V so 1 8V to3 3VCMOSlogiclevelscanbeused TheENC threshold is 0 9V For good jitter performance ENC should have fast rise and fall times Clock PLL and Duty Cycle Stabilizer Theencodeclockismultiplie...

Страница 23: ...urrent The default output driver current is 3 5mA This current can be adjusted by control register A2 in the serial pro gramming mode Available current levels are 1 75mA 2 1mA 2 5mA 3mA 3 5mA 4mA and...

Страница 24: ...randomized by applying an exclusive OR logic operation between the LSB and all other data output bits To decode the reverse operation is applied an exclusive OR operation is applied between the LSB a...

Страница 25: ...a serialinterfacethatprogramtheA Dmodecontrolregisters Data is written to a register with a 16 bit serial word Data can also be read back from a register to verify its contents Serial data transfer st...

Страница 26: ...zero GROUNDING AND BYPASSING The LTC2175 12 LTC2174 12 LTC2173 12 requires a printed circuit board with a clean unbroken ground plane A multilayer board with an internal ground plane in the first lay...

Страница 27: ...nal termination should only be used with 1 75mA 2 1mA or 2 5mA LVDS output current modes Bit 3 OUTOFF Output Disable Bit 0 Digital Outputs are Enabled 1 Digital Outputs are Disabled Bits 2 0 OUTMODE2...

Страница 28: ...LTC2175 12 LTC2174 12 LTC2173 12 28 21754312fa Typical Applications Silkscreen Top Top Side...

Страница 29: ...29 21754312fa LTC2175 12 LTC2174 12 LTC2173 12 TYPICAL Applications Inner Layer 2 GND Inner Layer 3 Inner Layer 4 Inner Layer 5 Power...

Страница 30: ...LTC2175 12 LTC2174 12 LTC2173 12 30 21754312fa TYPICAL Applications Bottom Side Silkscreen Bottom...

Страница 31: ...NC ENC CS SCK SDI GND OUT4B OUT4B OUT4A OUT4A 16 15 VDD 17 18 19 20 21 22 23 24 25 26 V DD V DD SENSE GND V REF PAR SER SDO GND OUT1A OUT1A OUT1B OUT1B 51 52 50 49 48 SDO PAR SER SENSE VDD 47 46 45 44...

Страница 32: ...ATED 6 SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE PIN 1 TOP MARK SEE NOTE 6 PIN 1 NOTCH R 0 30 TYP OR 0 35 45 C CHAMFER 0 40 0 10 52 51 1 2 BOTTOM VIEW EXPOSED...

Страница 33: ...echnology Corporation makes no representa tion that the interconnection of its circuits as described herein will not infringe on existing patent rights Revision History REV DATE DESCRIPTION PAGE NUMBE...

Страница 34: ...268 14 14 Bit 80Msps 105Msps 125Msps 1 8V Dual ADCs Ultralow Power 216mW 250mW 293mW 73 4dB SNR 85dB SFDR Serial LVDS Outputs 6mm 6mm QFN 36 LTC2266 12 LTC2267 12 LTC2268 12 12 Bit 80Msps 105Msps 125M...

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