LTC2321-12 ADC Datasheet

LTC2321-12 Datasheet, PDF, Equivalent


Part Number

LTC2321-12

Description

2Msps Differential Input ADC

Manufacture

Linear Technology

Total Page 26 Pages
Datasheet
Download LTC2321-12 Datasheet


LTC2321-12
LTC2321-12
Dual, 12-Bit + Sign, 2Msps
Differential Input ADC with Wide
Input Common Mode Range
FEATURES
DESCRIPTION
n 2Msps Throughput Rate
n ±0.5LSB INL (Typ)
n Guaranteed 12-Bit, No Missing Codes
n 8VP-P Differential Inputs with Wide Input Common
Mode Range
n 73dB SNR (Typ) at fIN = 500kHz
n –85dB THD (Typ) at fIN = 500kHz
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 30mW/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®2321-12 is a low noise, high speed dual 12-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 LTC2321-12
has an 8VP-P differential input range, making it ideal for
applications which require a wide dynamic range with
high common mode rejection. The LTC2321-12 achieves
±0.5LSB INL typical, no missing codes at 12 bits and
73dB SNR.
The LTC2321-12 has an onboard low drift (20ppm/°C max)
2.048V or 4.096V temperature-compensated reference.
The LTC2321-12 also has a high speed SPI-compatible
serial interface that supports CMOS or LVDS. The fast
2Msps per channel throughput with zero cycle latency
makes the LTC2321-12 ideally suited for a wide variety of
high speed applications. The LTC2321-12 dissipates only
30mW 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 Analog
Devices, Inc. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
DIFFERENTIAL INPUTS
NO CONFIGURATION REQUIRED
IN+, IN
INSTRUMENTATION
DIFFERENTIAL
25Ω
0V 0V
BIPOLAR
UNIPOLAR
25Ω
0V 0V
3.3V OR 5V
10µF
AIN1+
220pF
VDD REFOUT1
VBYP1
LTC2321-12
REFOUT2
VBYP2
AIN1–
AIN2+
AIN2–
VDD
CMOS/LVDS
REFINT
GND
SDO1
SDO2
CLKOUT
SCK
CNV
OGND OVDD
10µF
1µF
10µF
1µF
TO CONTROL
LOGIC
(FPGA, CPLD,
DSP, ETC.)
1.8V TO 2.5V
1µF
232112 TA01a
32k Point FFT fS = 2Msps, fIN = 500klHz
0 SNR = 72.9dB
–20
THD = –86.1dB
SINAD = 72.8dB
SFDR = 89.5dB
–40
–60
–80
–100
–120
–140
0
0.2 0.4 0.6 0.8
1
FREQUENCY (MHz)
232112 TA01b
For more information www.linear.com/LTC2321-12
232112fb
1

LTC2321-12
LTC2321-12
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VDD)...................................................6V
Supply Voltage (OVDD).................................................3V
Supply Bypass Voltage (VBYP1, VBYP2)........................3V
Analog Input Voltage
AIN+, AIN– (Note 3).................... –0.3V to (VDD + 0.3V)
REFOUT1,2.............................. .–0.3V to (VDD + 0.3V)
CNV (Note 15)........................... –0.3V to (VDD + 0.3V)
Digital Input Voltage
(Note 3)........................... (GND – 0.3V) to (OVDD + 0.3V)
Digital Output Voltage
(Note 3)........................... (GND – 0.3V) to (OVDD + 0.3V)
Power Dissipation................................................200mW
Operating Temperature Range
LTC2321C................................................. 0°C to 70°C
LTC2321I..............................................–40°C to 85°C
LTC2321H........................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
28 27 26 25 24 23
VDD 1
22 SCK
AIN2+ 2
AIN2– 3
GND 4
GND 5
21 SCK+
20 SDO2
29 19 SDO2+
GND 18 CLKOUT
AIN1– 6
17 CLKOUT+
AIN1+ 7
16 SDO1
VDD 8
15 SDO1+
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LTC2321-12#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2321CUFD-12#PBF LTC2321CUFD-12#TRPBF 23212
28-Lead (4mm × 5mm) Plastic QFN
0°C to 70°C
LTC2321IUFD-12#PBF LTC2321IUFD-12#TRPBF
23212
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC2321HUFD-12#PBF LTC2321HUFD-12#TRPBF 23212
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°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/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
E LECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C (Note 4).
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN+
VIN–
VIN+ – VIN–
VCM
IIN
CIN
CMRR
IREFOUT
Absolute Input Range (AIN1+, AIN2+)
Absolute Input Range (AIN1–, AIN2–)
Input Differential Voltage Range
Common Mode Input Range
Analog Input DC Leakage Current
Analog Input Capacitance
Input Common Mode Rejection Ratio
External Reference Current
(Note 5)
(Note 5)
VIN = VIN+ – VIN–
VIN = (VIN+ + VIN–)/2
fIN = 2.2MHz
REFINT = 0V, REFOUT = 4.096V
l0
l0
l –REFOUT1,2
l0
l –1
10
85
310
VDD
VDD
REFOUT1,2
VDD
1
V
V
V
V
µA
pF
dB
µA
2
For more information www.linear.com/LTC2321-12
232112fb


Features LTC2321-12 Dual, 12-Bit + Sign, 2Msps D ifferential Input ADC with Wide Input C ommon Mode Range FEATURES DESCRIPTION n 2Msps Throughput Rate n ±0.5LSB INL (Typ) n Guaranteed 12-Bit, No Miss ing Codes n 8VP-P Differential Inputs with Wide Input Common Mode Range n 73 dB SNR (Typ) at fIN = 500kHz n –85dB THD (Typ) at fIN = 500kHz n Guarantee d 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 LV DS SPI-Compatible Serial I/O n Power D issipation 30mW/Ch (Typ) n Small 28-Le ad (4mm × 5mm) QFN Package APPLICATION S n High Speed Data Acquisition System s n Communications n Remote Data Acqu isition n Imaging n Optical Networkin g n Automotive n Multiphase Motor Con trol The LTC®2321-12 is a low noise, high speed dual 12-bit + sign successiv e approximation register (SAR) ADC with differential inputs and wide input com mon mode range. Operating from a single 3.3V or 5V supply, the LTC2321.
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