LTC2321-14_15 Datasheet, PDF (1/28 Pages) Linear Technology – Dual, 14-Bit + Sign, 2Msps Differential Input ADC with Wide Input Common Mode Range

LTC2321-14
Features
Dual, 14-Bit + Sign, 2Msps
Differential Input ADC with Wide
Input Common Mode Range
Description
n _{2Msps Throughput Rate}
n _{±1LSB INL (Typ)}
n _{Guaranteed 14-Bit, No Missing Codes}
n _{8VP-P Differential Inputs with Wide Input Common}
Mode Range
n _{80dB SNR (Typ) at fIN = 500kHz}
n _{–90dB THD (Typ) at fIN = 500kHz}
n _{No-Cycle Latency}
n _{Guaranteed Operation to 125°C}
n _{Single 3.3V or 5V Supply}
n _{Low Drift (20ppm/°C Max) 2.048V or 4.096V Internal}
Reference
n _{1.8V to 2.5V I/O Voltages}
n _{CMOS or LVDS SPI-Compatible Serial I/O}
n _{Power Dissipation 33mW/Ch (Typ)}
n _{Small 28-Lead (4mm × 5mm) QFN Package}
Applications
n _{High Speed Data Acquisition Systems}
n _{Communications}
n _{Remote Data Acquisition}
n _Imaging
n _{Optical Networking}
n _Automotive
n _{Multiphase Motor Control}
The LTC^®2321-14 is a low noise, high speed dual 14-bit +
sign successive approximation register (SAR) ADC with
differential inputs and wide input common mode range.
Operating from a single 3.3V or 5V supply, the LTC2321-14
has an 8V_P-P differential input range, making it ideal for
applications which require a wide dynamic range with high
common mode rejection. The LTC2321-14 achieves ±1LSB
INL typical, no missing codes at 14 bits and 80dB SNR.
The LTC2321-14 has an onboard low drift (20ppm/°C max)
2.048V or 4.096V temperature-compensated reference.
The LTC2321-14 also has a high speed SPI-compatible
serial interface that supports CMOS or LVDS. The fast
2Msps per channel throughput with no-cycle latency
makes the LTC2321-14 ideally suited for a wide variety of
high speed applications. The LTC2321-14 dissipates only
33mW per channel and offers nap and sleep modes to
reduce the power consumption to 5μW for further power
savings during inactive periods.
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
3.3V OR 5V
DIFFERENTIAL INPUTS
NO CONFIGURATION REQUIRED
IN⁺, IN^–
INSTRUMENTATION
DIFFERENTIAL
25Ω
0V
BIPOLAR
0V
UNIPOLAR
25Ω
0V
0V
10µF
V_DD REFOUT1
A_IN1+
220pF
VBYP1
LTC2321-14
REFOUT2
VBYP2
A_IN1–
A_IN2+
A_IN2–
V_DD
CMOS/LVDS
REFINT
GND
SDO1
SDO2
CLKOUT
SCK
CNV
OGND OV_DD
10µF
1µF
10µF
1µF
TO CONTROL
LOGIC
(FPGA, CPLD,
DSP, ETC.)
1.8V TO 2.5V
1µF
232114 TA01a
32k Point FFT f_S = 2Msps, f_IN = 500kHz
0
SNR = 80.2dB
–20
THD = –92.5dB
SINAD = 79.9dB
SFDR = 98.6dB
–40
–60
–80
–100
–120
–140
0
0.2
0.4
0.6
0.8
1.0
FREQUENCY (MHz)
232114 TA01b
For more information www.linear.com/LTC2321-14
232114fa
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