Document
FEATURES
n Sample Rate: 130Msps n 78dBFS Noise Floor n 100dB SFDR n SFDR >83dB at 250MHz (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 Optional Data Output Randomizer n LVDS or CMOS Outputs n Single 3.3V Supply n Power Dissipation: 1.25W n Clock Duty Cycle Stabilizer n Pin Compatible 14-Bit Version
130Msps: LTC2208 (16-Bit), LTC2208-14 (14-Bit) n 64-Pin (9mm × 9mm) QFN Package
APPLICATIONS
n Telecommunications n Receivers n Cellular Base Stations n Spectrum Analysis n Imaging Systems n ATE
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.
LTC2208
16-Bit, 130Msps ADC
DESCRIPTION
The LTC®2208 is a 130Msps, sampling 16-bit A/D converter designed for digitizing high frequency, wide dynamic range signals with input frequencies up to 700MHz. The input range of the ADC can be optimized with the PGA front end.
The LTC2208 is perfect for demanding communications applications, with AC performance that includes 78dBFS Noise Floor and 100dB spurious free dynamic range (SFDR). Ultra low jitter of 70fsRMS allows undersampling of high input frequencies with excellent noise performance. Maximum DC specs include ±4LSB INL, ±1LSB DNL (no missing codes).
The digital output can be either differential LVDS or single-ended CMOS. There are two format options for the CMOS outputs: a single bus running at the full data rate or demultiplexed buses running at half data rate. A separate output power supply allows the CMOS output swing to range from 0.5V to 3.6V.
The ENC+ and ENC– inputs may be driven differentially or single-ended with a sine wave, PECL, LVDS, TTL or CMOS inputs. An optional clock duty cycle stabilizer allows high performance at full speed with a wide range of clock duty cycles.
TYPICAL APPLICATION
VCM 2.2μF
1.25V COMMON MODE BIAS VOLTAGE
3.3V SENSE
INTERNAL ADC REFERENCE GENERATOR
OVDD
AIN+
ANALOG INPUT AIN–
+
S/H AMP
–
16-BIT PIPELINED ADC CORE
CORRECTION LOGIC AND SHIFT REGISTER
OUTPUT DRIVERS
CLOCK/DUTY CYCLE
CONTROL
ENC + ENC –
OGND VDD GND
PGA SHDN DITH MODE LVDS RAND ADC CONTROL INPUTS
0.5V TO 3.6V 1μF
OF
CLKOUT
D15 • • • D0
CMOS OR LVDS
1μF
1μF
3.3V 1μF
2208 TA01
AMPLITUDE (dBFS)
64k Point FFT, FIN = 15.1MHz, –1dB, PGA = 0
0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 –130
0
10 20 30 40 50 60
FREQUENCY (MHz)
2208 TA01b
2208fc
1
LTC2208
ABSOLUTE MAXIMUM RATINGS
OVDD = VDD (Notes 1 and 2)
Supply Voltage (VDD) ................................... –0.3V to 4V Digital Output Ground Voltage (OGND) ........ –0.3V to 1V 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
LTC2208C ..