LTC2270 Datasheet, PDF (1/36 Pages) Linear Technology – 16-Bit, 20Msps Low Noise Dual ADC

FEATURES
n _{Two-Channel Simultaneously Sampling ADC}
n _{84.1dB SNR (46μVRMS Input Referred Noise)}
n _{99dB SFDR}
n _{±2.3LSB INL(Max)}
n _{Low Power: 160mW Total, 80mW per Channel}
n _{Single 1.8V Supply}
n _{CMOS, DDR CMOS, or DDR LVDS Outputs}
n _{Selectable Input Ranges: 1VP-P to 2.1VP-P}
n _{200MHz Full Power Bandwidth S/H}
n _{Shutdown and Nap Modes}
n _{Serial SPI Port for Configuration}
n _{Pin Compatible with}
LTC2180: 16-Bit, 25Msps, 78mW
LTC2140-14: 14-Bit, 25Msps, 50mW
n _{64-Lead (9mm × 9mm) QFN Package}
APPLICATIONS
n _{Low Power Instrumentation}
n _{Software Defined Radios}
n _{Portable Medical Imaging}
n _{Multi-Channel Data Acquisition}
LTC2270
16-Bit, 20Msps
Low Noise Dual ADC
DESCRIPTION
The LTC^®2270 is a two-channel simultaneous sampling
16-bit A/D converter designed for digitizing high frequency,
wide dynamic range signals. It is perfect for demanding
applications with AC performance that includes 84.1dB
SNR and 99dB spurious free dynamic range (SFDR).
DC specs include ±1LSB INL (typ), ±0.2LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 1.44LSB_RMS.
The digital outputs can be either full rate CMOS, Double
Data Rate CMOS, or Double Data Rate LVDS. A separate
output power supply allows the CMOS output swing to
range from 1.2V to 1.8V.
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 al-
lows 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
1.8V
V_DD
CH 1
ANALOG
S/H
INPUT
16-BIT
ADC CORE
CH 2
ANALOG
INPUT
20MHz
CLOCK
S/H
16-BIT
ADC CORE
CLOCK
CONTROL
GND
1.8V
OV_DD
OUTPUT
DRIVERS
D1_15
t
t
t
D1_0
D2_15
t
t
t
D2_0
CMOS,
DDR CMOS
OR DDR LVDS
OUTPUTS
OGND
2270 TA01
Integral Non-Linearity (INL)
2.0
1.5
1.0
0.5
0.0
–0.5
–1.0
–1.5
–2.0
0
16384 32768 49152 65536
OUTPUT CODE
2270 TA02
2270f
1