Document
FEATURES
n High Speed Serial Interface (JESD204) n Sample Rate: 80Msps/65Msps n 77.7dBFS Noise Floor n 100dB SFDR n SFDR >90dB at 140MHz (1.5VP-P Input Range) n PGA Front End (2.25VP-P or 1.5VP-P Input Range) n 700MHz Full Power Bandwidth S/H n Optional Internal Dither n Single 3.3V Supply n Power Dissipation: 1100mW/990mW n Clock Duty Cycle Stabilizer n Pin Compatible Family
105Msps: LTC2274 80Msps: LTC2273 65Msps: LTC2272 n 40-Pin 6mm × 6mm QFN Package
APPLICATIONS
n Telecommunications n Receivers n Cellular Base Stations n Spectrum Analysis n Imaging Systems n ATE
LTC2273/LTC2272
16-Bit, 80Msps/65Msps Serial Output ADC
DESCRIPTION
The LTC®2273/LTC2272 are 80Msps/65Msps, 16-bit A/D converters with a high speed serial interface. They are designed for digitizing high frequency, wide dynamic range signals with an input bandwidth of 700MHz. The input range of the ADC can be optimized using the PGA front end. The output data is serialized according to the JEDEC serial interface for data converters specification (JESD204).
The LTC2273/LTC2272 are perfect for demanding applications where it is desirable to isolate the sensitive analog circuits from the noisy digital logic. The AC performance includes a 77.7dB Noise Floor and 100dB spurious free dynamic range (SFDR). Ultra low internal jitter of 80fs RMS allows undersampling of high input frequencies with excellent noise performance. Maximum DC specs include ±4.5LSB INL and ±1LSB DNL (no missing codes) over temperature.
The encode clock inputs, ENC+ and ENC–, may be driven differentially or single-ended with a sine wave, PECL, LVDS, TTL or CMOS inputs. A clock duty cycle stabilizer allows high performance at full speed with a wide range of clock duty cycles.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
VCM 2.2μF
1.25V COMMON MODE BIAS VOLTAGE
3.3V SENSE
INTERNAL ADC REFERENCE GENERATOR
FAM
8B/10B ENCODER
16
20
SYNC+ SYNC– OVDD 1.2V TO 3.3V
0.1μF
AIN +
ANALOG INPUT AIN –
CMLOUT+
+
S/H AMP
–
CLOCK
16-BIT PIPELINED ADC CORE
CLOCK/DUTY CYCLE
CONTROL
CORRECTION LOGIC
SCRAMBLER/ PATTERN
GENERATOR
SERIALIZER
CMLOUT–
20X PLL
3.3V VDD
GND
0.1μF 0.1μF
ENC+ ENC– PGA DITH MSBINV SHDN
PAT1 PAT0 SCRAM SRR1 SRR0
ASIC OR FPGA
50Ω 50Ω
+
SERIAL RECEIVER
–
22732 TA01
AMPLITUDE (dBFS)
128k Point FFT, fIN = 4.93MHz, –1dBFS, PGA = 0
0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130
0
10
20
30
FREQUENCY (MHz)
40
22732 G04
22732fa
1
LTC2273/LTC2272
ABSOLUTE MAXIMUM RATINGS
OVDD = VDD (Notes 1, 2)
Supply Voltage (VDD) ................................... –0.3V to 4V Analog Input Voltage (Note 3).......–0.3V to (VDD + 0.3V) Digital Input Voltage......................–0.3V to (VDD + 0.3V) Digital Output Voltage ................ –0.3V to (OVDD + 0.3V) Power Dissipation .............................................2000mW Operating Temperature Range
LTC2273C/LTC2272C ............................... 0°C to 70°C LTC2273I/LTC2272I.............................. –40°C to 85°C Storage Temperature Range................... –65°C to 150°C Digital Output Supply Voltage (OVDD) .......... –0.3V to 4V
PIN CONFIGURATION
TOP VIEW
GND VCM SENSE GND MSBINV PGA SCRAM PAT1 PAT0 FAM
40 39 38 37 36 35 34 33 32 31
VDD 1 VDD 2 GND 3
30 GND 29 SYNC– 28 SYNC+
AIN+ 4 AIN– 5 GND 6
GND 7
27 GND
26 GND 41
25 OVDD 24 CMLOUT+
GND 8
23 CMLOUT–
ENC+ 9 ENC– 10
22 OVDD 21 GND
11 12 13 14 15 16 17 18 19 20
GND VDD VDD GND DITH ISMODE SRR0 SRR1 SHDN SHDN
UJ PACKAGE 40-LEAD (6mm s 6mm) PLASTIC QFN
TJMAX = 150°C, θJA = 22°C/W EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2273CUJ#PBF
LTC2273CUJ#TRPBF
LTC2273UJ
40-Lead (6mm × 6mm) Plastic QFN
0°C to 70°C
LTC2273IUJ#PBF
LTC2273IUJ#TRPBF
LTC2273UJ
40-Lead (6mm × 6mm) Plastic QFN
–40°C to 85°C
LTC2272CUJ#PBF
LTC2272CUJ#TRPBF
LTC2272UJ
40-Lead (6mm × 6mm) Plastic QFN
0°C to 70°C
LTC2272IUJ#PBF
LTC2272IUJ#TRPBF
LTC2272UJ
40-Lead (6mm × 6mm) Plastic QFN
–40°C to 85°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2273CUJ
LTC2273CUJ#TR
LTC2273UJ
40-Lead (6mm × 6mm) Plastic QFN
0°C to 70°C
LTC2273IUJ
LTC2273IUJ#TR
LTC2273UJ
40-Lead (6mm × 6mm) Plastic QFN
–40°C to 85°C
LTC2272CUJ
LTC2272CUJ#TR
LTC2272UJ
40-Lead (6mm × 6mm) Plastic QFN
0°C to 70°C
LTC2272IUJ
LTC2272IUJ#TR
LTC2272UJ
40-Lead (6mm × 6mm) Plastic QFN
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree.