FEATURES
n 2-Channel Simultaneous Sampling ADC
n Serial LVDS Outputs: 1, 2 or 4 Bits per Channel
n 76.8dB SNR
n 90dB SFDR
n Low Power: 432mW/360mW/249mW Total
n 216mW/180mW/125mW per Channel
n Single 1.8V Supply
n Selectable Input Ranges: 1VP-P to 2VP-P
n 550MHz Full-Power Bandwidth S/H
n Shutdown and Nap Modes
n Serial SPI Port for Configuration
n 52-Pin (7mm × 8mm) QFN Package
APPLICATIONS
n Communications
n Cellular Base Stations
n Software-Defined Radios
n Portable Medical Imaging
n Multi-Channel Data Acquisition
n Nondestructive Testing
LTC2195
LTC2194/LTC2193
16-Bit, 125/105/80Msps
Low Power Dual ADCs
DESCRIPTION
The LTC®2195/LTC2194/LTC2193 are 2-channel, simul-
taneous sampling 16-bit A/D converters designed for
digitizing high frequency, wide dynamic range signals.
They are perfect for demanding communications applica-
tions with AC performance that includes 76.8dB SNR and
90dB spurious free dynamic range (SFDR). Ultralow jitter
of 0.07psRMS allows undersampling of IF frequencies with
excellent noise performance.
DC specs include ±2LSB INL (typ), ±0.5LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 3.4LSBRMS.
To minimize the number of data lines the digital outputs
are serial LVDS. Each channel outputs two bits or four bits
at a time. At lower sampling rates there is a one bit per
channel option. The LVDS drivers have optional internal
termination and adjustable output levels to ensure clean
signal integrity.
The ENC+ and ENC– inputs may be driven differentially or
single ended with a sine wave, PECL, LVDS, TTL or CMOS
inputs. An internal clock duty cycle stabilizer allows high
performance at full speed for 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
CH1
ANALOG
INPUT
CH2
ANALOG
INPUT
ENCODE
INPUT
S/H
S/H
1.8V
VDD
16-BIT
ADC CORE
16-BIT
ADC CORE
PLL
GND
1.8V
OVDD
DATA
SERIALIZER
OUT1A
OUT1B
OUT1C
OUT1D
OUT2A
OUT2B
OUT2C
OUT2D
DATA CLOCK OUT
FRAME
SERIALIZED
LVDS
OUTPUTS
OGND
219543 TA01a
2-Tone FFT, fIN = 70MHz and 69MHz
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0 10 20 30 40 50 60
FREQUENCY (MHz)
219543 TA01b
219543f
1
