LTC2321-14 ADC Datasheet

LTC2321-14 Datasheet PDF, Equivalent


Part Number

LTC2321-14

Description

2Msps Differential Input ADC

Manufacture

Analog Devices

Total Page 28 Pages
Datasheet
Download LTC2321-14 Datasheet


LTC2321-14
Features
LTC2321-14
Dual, 14-Bit + Sign, 2Msps
Differential Input ADC with Wide
Input Common Mode Range
Description
nn 2Msps Throughput Rate
nn ±1LSB INL (Typ)
nn Guaranteed 14-Bit, No Missing Codes
nn 8VP-P Differential Inputs with Wide Input Common
Mode Range
nn 80dB SNR (Typ) at fIN = 500kHz
nn –90dB THD (Typ) at fIN = 500kHz
nn No-Cycle Latency
nn Guaranteed Operation to 125°C
nn Single 3.3V or 5V Supply
nn Low Drift (20ppm/°C Max) 2.048V or 4.096V Internal
Reference
nn 1.8V to 2.5V I/O Voltages
nn CMOS or LVDS SPI-Compatible Serial I/O
nn Power Dissipation 33mW/Ch (Typ)
nn Small 28-Lead (4mm × 5mm) QFN Package
Applications
nn High Speed Data Acquisition Systems
nn Communications
nn Remote Data Acquisition
nn Imaging
nn Optical Networking
nn Automotive
nn 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 8VP-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 Analog
Devices, Inc. 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
VDD REFOUT1
AIN1+
220pF
VBYP1
LTC2321-14
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
232114 TA01a
32k Point FFT fS = 2Msps, fIN = 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
232114fc
1

LTC2321-14
LTC2321-14
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..... (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/LTC2321-14#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING* PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2321CUFD-14#PBF LTC2321CUFD-14#TRPBF 23214
28-Lead (4mm × 5mm) Plastic QFN
0°C to 70°C
LTC2321IUFD-14#PBF LTC2321IUFD-14#TRPBF
23214
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 85°C
LTC2321HUFD-14#PBF LTC2321HUFD-14#TRPBF 23214
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
VIN+
VIN–
VIN+ – VIN–
VCM
IIN
CIN
CMRR
IREFOUT
PARAMETER
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
CONDITIONS
(Note 5)
(Note 5)
VIN = VIN+ – VIN–
VIN = (VIN+ + VIN–)/2
fIN = 500kHz
REFINT = 0V, REFOUT = 4.096V
MIN
l0
l0
l –REFOUT1,2
l0
l –1
TYP
10
85
310
MAX
VDD
VDD
REFOUT1,2
VDD
1
UNITS
V
V
V
V
µA
pF
dB
µA
232114fc
2 For more information www.linear.com/LTC2321-14


Features Features LTC2321-14 Dual, 14-Bit + Sign , 2Msps Differential Input ADC with Wid e Input Common Mode Range Description nn 2Msps Throughput Rate nn ±1LSB INL (Typ) nn Guaranteed 14-Bit, No Missing Codes nn 8VP-P Differential Inputs with Wide Input Common Mode Range nn 80dB S NR (Typ) at fIN = 500kHz nn –90dB THD (Typ) at fIN = 500kHz nn No-Cycle Late ncy nn Guaranteed Operation to 125°C n n Single 3.3V or 5V Supply nn Low Drift (20ppm/°C Max) 2.048V or 4.096V Inter nal Reference nn 1.8V to 2.5V I/O Volta ges nn CMOS or LVDS SPI-Compatible Seri al I/O nn Power Dissipation 33mW/Ch (Ty p) nn Small 28-Lead (4mm × 5mm) QFN Pa ckage Applications nn High Speed Data A cquisition Systems nn Communications nn Remote Data Acquisition nn Imaging nn Optical Networking nn Automotive nn Mul tiphase Motor Control The LTC®2321-14 is a low noise, high speed dual 14-bit + sign successive approximation regist er (SAR) ADC with differential inputs a nd wide input common mode range. Operating from a single 3.3V or 5V su.
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