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Linear Technology Electronic Components Datasheet

LTC2351HUH-12 Datasheet

1.5Msps Simultaneous Sampling ADC

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LTC2351-12
FEATURES
6 Channel, 12-Bit, 1.5Msps
Simultaneous Sampling ADC
With Shutdown
DESCRIPTION
n 1.5Msps ADC with 6 Simultaneously Sampled
Differential Inputs
n 250ksps Throughput per Channel
n 72dB 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
APPLICATIONS
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.
The LTC®2351-12 is a 12-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
LTC2351-12 suitable for portable applications.
The LTC2351-12 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.
BLOCK DIAGRAM
CH5CH5+
21
20 19
CH4CH4+
18
17 16
CH3
15
CH3+
14 12
13
CH2CH2+
11
10 9
CH1CH1+
8
76
CH0CH0+
5
4
S AND H
S AND H
S AND H
S AND H
S AND H
S AND H
MUX
2.5V
REFERENCE
10μF
3V
VCC
VDD
24
25
1.5Msps
12-BIT ADC
12-BIT LATCH 0
12-BIT LATCH 1
12-BIT LATCH 2
12-BIT LATCH 3
12-BIT LATCH 4
12-BIT LATCH 5
TIMING
LOGIC
33 22
23 29
GND 10μF VREF BIP
26 27 28
SEL2 SEL1 SEL0
THREE-
STATE
SERIAL
OUTPUT
PORT
OVDD
3V
3
SD0
1
OGND
2
CONV
30
SCK
32
DGND
31
235112 TA01
0.1μF
235112fa
1


Linear Technology Electronic Components Datasheet

LTC2351HUH-12 Datasheet

1.5Msps Simultaneous Sampling ADC

No Preview Available !

LTC2351-12
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VDD, VCC, OVDD)................................4V
Analog and VREF Input Voltages
(Note 3) ................................... –0.3V to (VDD + 0.3V)
Digital Input Voltages................... –0.3V to (VDD + 0.3V)
Digital Output Voltage .................. –0.3V to (VDD + 0.3V)
Power Dissipation ...............................................100mW
Operation Temperature Range
LTC2351C-12 ........................................... 0°C to 70°C
LTC2351I-12 ........................................–40°C to 85°C
LTC2351H-12.....................................–40°C to 125°C
Storage Temperature Range...................–65°C to 150°C
PIN CONFIGURATION
TOP VIEW
16 15 14 13 12 11 10 9
CH4+ 17
8 CH1
CH418
7 CH1+
GND 19
CH5+ 20
CH521
33
6 GND
5 CH0
4 CH0+
GND 22
VREF 23
VCC 24
3 OVDD
2 OGND
1 SDO
25 26 27 28 29 30 31 32
QFN PACKAGE
32-PIN (5mm s 5mm) PLASTIC QFN
TJMAX = 150°C, θJA = 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-12#PBF
LTC2351CUH-12#TRPBF 235112
32-Pin (5mm × 5mm) Plastic QFN
0°C to 70°C
LTC2351IUH-12#PBF
LTC2351IUH-12#TRPBF 235112
32-Pin (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC2351HUH-12#PBF
LTC2351HUH-12#TRPBF 235112
32-Pin (5mm × 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.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
CONVERTER CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. With internal reference, VDD = VCC = 3V.
PARAMETER
CONDITIONS
MIN TYP MAX
UNITS
Resolution (No Missing Codes)
l 12
Bits
Integral Linearity Error
(Note 5)
l –1
±0.25
1
LSB
Offset Error
(Note 4)
LTC2351H-12
l –4.5
±1
4.5
mV
l –5
±1
5
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
ppm/°C
±1
ppm/°C
235112fa
2


Part Number LTC2351HUH-12
Description 1.5Msps Simultaneous Sampling ADC
Maker Linear
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LTC2351HUH-12 Datasheet PDF






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