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LTC2351IUH-14#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
LTC2351-14
1
235114fb
FEATURES
APPLICATIONS
DESCRIPTION
6-Channel, 14-Bit, 1.5Msps
Simultaneous Sampling ADC
with Shutdown
The LTC
®
2351-14 is a 14-bit, 1.5Msps ADC with six simul-
taneously sampled differential inputs. The device draws
only 5.5mA from a single 3V supply, and comes in a tiny
32-pin (5mm × 5mm) QFN package. A sleep shutdown
mode further reduces power consumption to 12μW. The
combination of low power and tiny package makes the
LTC2351-14 suitable for portable applications.
The LTC2351-14 contains six separate differential inputs
that are sampled simultaneously on the rising edge of the
CONV signal. These six sampled inputs are then converted
at a rate of 250ksps per channel.
The 83dB common mode rejection allows users to eliminate
ground loops and common mode noise by measuring
signals differentially from the source.
The device converts 0V to 2.5V unipolar inputs differentially,
or ±1.25V bipolar inputs also differentially, depending on the
state of the BIP pin. Any analog input may swing rail-to-rail
as long as the differential input range is maintained.
The conversion sequence can be abbreviated to convert
fewer than six channels, depending on the logic state of
the SEL2, SEL1 and SEL0 inputs.
The serial interface sends out the six conversion results in 96
clocks for compatibility with standard serial interfaces.
n
1.5Msps ADC with Six Simultaneously Sampled
Differential Inputs
n
250ksps Throughput per Channel
n
75dB SINAD
n
Low Power Dissipation: 16.5mW
n
3V Single Supply Operation
n
2.5V Internal Bandgap Reference, Can Be Overdriven
with External Reference
n
3-Wire SPI-Compatible Serial Interface
n
Internal Conversion Triggered by CONV
n
Sleep (12μW) Shutdown Mode
n
NAP (4.5mW) Shutdown Mode
n
0V to 2.5V Unipolar, or ±1.25V Bipolar Differential
Input Range
n
83dB Common Mode Rejection
n
Tiny 32-Pin (5mm × 5mm) QFN Package
n
Multiphase Power Measurement
n
Multiphase Motor Control
n
Data Acquisition Systems
n
Uninterruptable Power Supplies
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 6084440, 6522187.
BLOCK DIAGRAM
–
+
4
5
25
24
–
+
7 6912
13
1619 8
CH0
–
CH0
+
CH1
–
CH1
+
10
11
–
+
1415
CH2
–
CH2
+
CH3
–
CH3
+
–
+
17
18
–
+
2021
S AND H S AND H S AND H S AND H S AND H
CH4
–
CH4
+
CH5
–
CH5
+
MUX
V
REF
10μF
BIP SEL2 SEL1 SEL0GND
2.5V
REFERENCE
1.5Msps
14-BIT ADC
14-BIT LATCH 5
14-BIT LATCH 4
14-BIT LATCH 3
14-BIT LATCH 2
14-BIT LATCH 1
14-BIT LATCH 0
10μF 3V
V
CC
V
DD
2629232233 27 28
2
1
SD0
0.1μF
3
OV
DD
3V
32
SCK
31
DGND
OGND
30
CONV
THREE-
STATE
SERIAL
OUTPUT
PORT
TIMING
LOGIC
235114 TA01
–
+
S AND H
LTC2351-14
2
235114fb
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
DD
, V
CC
, OV
DD
) ................................ 4V
Analog and V
REF
Input Voltages
(Note 3) ................................... –0.3V to (V
DD
+ 0.3V)
Digital Input Voltages ................... –0.3V to (V
DD
+ 0.3V)
Digital Output Voltage .................. –0.3V to (V
DD
+ 0.3V)
Power Dissipation ...............................................100mW
Operation Temperature Range
LTC2351C-14 ........................................... 0°C to 70°C
LTC2351I-14 ........................................ –40°C to 85°C
LTC2351H-14 ..................................... –40°C to 125°C
Storage Temperature Range ................... –65°C to 150°C
(Notes 1, 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution (No Missing Codes)
l
14 Bits
Integral Linearity Error (Note 5)
l
–3 ±1 3 LSB
Offset Error (Note 4)
LTC2351H-14
l
l
–4.5
–5
±1
±1
4.5
5
mV
mV
Offset Match from CH0 to CH5 –3 ±0.5 3 mV
Range Error (Note 4)
l
–12 ±2 12 mV
Range Match from CH0 to CH5 –5 ±1 5 mV
Range Tempco Internal Reference (Note 4)
External Reference
±15
±1
ppm/°C
ppm/°C
CONVERTER CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. With internal reference, V
DD
= V
CC
= 3V.
PIN CONFIGURATION
16 15 14 13 12 11 10 9
25 26 27 28
TOP VIEW
QFN PACKAGE
32-PIN (5mm s 5mm) PLASTIC QFN
29 30 31 32
1
2
3
4
5
6
7
8
24
23
22
21
20
19
18
17CH4
+
CH4
–
GND
CH5
+
CH5
–
GND
V
REF
V
CC
CH1
–
CH1
+
GND
CH0
–
CH0
+
OV
DD
OGND
SDO
GND
CH3
–
CH3
+
GND
GND
CH2
–
CH2
+
GND
V
DD
SEL2
SEL1
SEL0
BIP
CONV
DGND
SCK
33
T
JMAX
= 150°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2351CUH-14#PBF LTC2351CUH-14#TRPBF 235114
32-Pin (5mm × 5mm) Plastic QFN
0°C to 70°C
LTC2351IUH-14#PBF LTC2351IUH-14#TRPBF 235114
32-Pin (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC2351HUH-14#PBF LTC2351HUH-14#TRPBF 235114
32-Pin (5mm × 5mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed 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 specifi cations, go to:
http://www.linear.com/tapeandreel/
LTC2351-14
3
235114fb
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Analog Differential Input Range (Notes 3, 8, 9) 2.7V ≤ V
DD
≤ 3.6V, Unipolar
2.7V ≤ V
DD
≤ 3.6V, Bipolar
0 to 2.5
±1.25
V
V
V
CM
Analog Common Mode + Differential
Input Range (Note 8)
0 to V
DD
V
I
IN
Analog Input Leakage Current
l
1μA
C
IN
Analog Input Capacitance 13 pF
t
ACQ
Sample-and-Hold Acquisition Time (Note 6)
l
39 ns
t
AP
Sample-and-Hold Aperture Delay Time 1 ns
t
JITTER
Sample-and-Hold Aperture Delay Time Jitter 0.3 ps
t
SK
Channel to Channel Aperture Skew 200 ps
CMRR Analog Input Common Mode Rejection Ratio f
IN
= 100kHz, V
IN
= 0V to 3V
f
IN
= 10MHz, V
IN
= 0V to 3V
–83
–67
dB
dB
ANALOG INPUT
The l denotes the specifi cations which apply over the full operating temperature range,
otherwise specifi cations are at T
A
= 25°C. With internal reference, V
DD
= V
CC
= 3V.
DYNAMIC ACCURACY
The l denotes the specifi cations which apply over the full operating temperature range,
otherwise specifi cations are at T
A
= 25°C. With internal reference, V
DD
= V
CC
= 3V.
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
REF
Output Voltage I
OUT
= 0 2.5 V
V
REF
Output Tempco 15 ppm/°C
V
REF
Line Regulation V
DD
= 2.7V to 3.6V, V
REF
= 2.5V 600 μV/V
V
REF
Output Resistance Load Current = 0.5mA 0.2 Ω
V
REF
Settling Time Ext C
REF
= 10μF 2 ms
External V
REF
Input Range 2.55 V
DD
V
INTERNAL REFERENCE CHARACTERISTICS
T
A
= 25°C. V
DD
= V
CC
= 3V.
DIGITAL INPUTS AND DIGITAL OUTPUTS
The l denotes the specifi cations which apply over the
full operating temperature range, otherwise specifi cations are at T
A
= 25°C. V
DD
= V
CC
= 3V.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IH
High Level Input Voltage V
DD
= 3.3V
l
2.4 V
V
IL
Low Level Input Voltage V
DD
= 2.7V
l
0.6 V
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SINAD Signal-to-Noise Plus
Distortion Ratio
100kHz Input Signal
300kHz Input Signal
100kHz Input Signal (LTC2351H-14)
l
l
71
70
75
75
75
dB
dB
dB
THD Total Harmonic
Distortion
100kHz First 5 Harmonics
300kHz First 5 Harmonics
100kHz First 5 Harmonics (LTC2351H-14)
l
l
–80
–79
–90
–86
–89
dB
dB
dB
SFDR Spurious Free
Dynamic Range
100kHz Input Signal
300kHz Input Signal
90
86
dB
dB
IMD Intermodulation
Distortion
0.625V
P-P
, 833kHz into CH0
+
, 0.625V
P-P
, 841kHz into CH0
–
Bipolar Mode. Also Applicable to Other Channels
–80 dB
Code-to-Code
Transition Noise
V
REF
= 2.5V (Note 17) 0.7 LSB
RMS
Full Power Bandwidth V
IN
= 2.5V
P-P
, SDO = 11585LSB
P-P
(–3dBFS) (Note 15) 50 MHz
Full Linear Bandwidth S/(N + D) ≥ 68dB, Bipolar Differential Input 5 MHz
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

LTC2351IUH-14#TRPBF

Mfr. #:
Buy LTC2351IUH-14#TRPBF
Manufacturer:
Analog Devices Inc.
Description:
Analog to Digital Converters - ADC 14-Bit, 6-Channel 1.5Msps simultaneous Sampling ADC
Lifecycle:
New from this manufacturer.
Delivery:
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