LTC2351HUH-14#PBF Linear Technology, LTC2351HUH-14#PBF Datasheet

IC ADC 14BIT 1.5MSPS 32-QFN

LTC2351HUH-14#PBF

Manufacturer Part Number
LTC2351HUH-14#PBF
Description
IC ADC 14BIT 1.5MSPS 32-QFN
Manufacturer
Linear Technology
Datasheet

Specifications of LTC2351HUH-14#PBF

Number Of Bits
14
Sampling Rate (per Second)
1.5M
Data Interface
Serial, SPI™
Number Of Converters
1
Power Dissipation (max)
16.5mW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
32-WFQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC2351HUH-14#PBFLTC2351HUH-14
Manufacturer:
LT
Quantity:
10 000
FEATURES
APPLICATIONS
n
n
n
n
n
n
n
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n
n
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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
1.5Msps ADC with Six Simultaneously Sampled
Differential Inputs
250ksps Throughput per Channel
75dB SINAD
Low Power Dissipation: 16.5mW
3V Single Supply Operation
2.5V Internal Bandgap Reference, Can Be Overdriven
with External Reference
3-Wire SPI-Compatible Serial Interface
Internal Conversion Triggered by CONV
Sleep (12μW) Shutdown Mode
NAP (4.5mW) Shutdown Mode
0V to 2.5V Unipolar, or ±1.25V Bipolar Differential
Input Range
83dB Common Mode Rejection
Tiny 32-Pin (5mm × 5mm) QFN Package
Multiphase Power Measurement
Multiphase Motor Control
Data Acquisition Systems
Uninterruptable Power Supplies
21
S AND H
CH5
20
CH5
+
19
18
S AND H
CH4
17
CH4
+
16
15
CH3
S AND H
14
CH3
MUX
+
12
13
11
S AND H
CH2
10
CH2
+
9
8
S AND H
CH1
7
CH1
Simultaneous Sampling ADC
+
6
DESCRIPTION
The LTC
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.
33
5
S AND H
CH0
6-Channel, 14-Bit, 1.5Msps
REFERENCE
2.5V
22
GND
4
CH0
®
+
2351-14 is a 14-bit, 1.5Msps ADC with six simul-
10μF
23
14-BIT ADC
V
10μF
REF
1.5Msps
29
BIP
24
V
CC
3V
25
26
14-BIT LATCH 0
14-BIT LATCH 1
14-BIT LATCH 2
14-BIT LATCH 3
14-BIT LATCH 4
14-BIT LATCH 5
SEL2 SEL1 SEL0
V
DD
with Shutdown
TIMING
LOGIC
27
28
LTC2351-14
OUTPUT
THREE-
SERIAL
STATE
PORT
235114 TA01
30
32
31
3
1
2
OV
3V
SD0
OGND
CONV
SCK
DGND
DD
235114fb
0.1μF
1

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LTC2351HUH-14#PBF Summary of contents

Page 1

... 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 – + – ...

Page 2

... LTC2351CUH-14#PBF LTC2351CUH-14#TRPBF LTC2351IUH-14#PBF LTC2351IUH-14#TRPBF LTC2351HUH-14#PBF LTC2351HUH-14#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: CONVERTER CHARACTERISTICS temperature range, otherwise specifi ...

Page 3

ANALOG INPUT l The denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are 25°C. With internal reference SYMBOL PARAMETER V Analog Differential Input Range (Notes ...

Page 4

LTC2351-14 DIGITAL INPUTS AND DIGITAL OUTPUTS full operating temperature range, otherwise specifi cations are Digital Input Current IN C Digital Input Capacitance IN V High Level Output Voltage OH V Low Level Output Voltage OL I Hi-Z ...

Page 5

TIMING CHARACTERISTICS Note 5: Integral linearity is tested with an external 2.55V reference and is defi ned as the deviation of a code from the straight line passing through the actual endpoints of a transfer curve. The deviation is measured ...

Page 6

LTC2351-14 TYPICAL PERFORMANCE CHARACTERISTICS 100kHz Unipolar Sine Wave 8192 Point FFT Plot 0 –10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –110 –120 100 FREQUENCY (kHz) 235114 G06 Integral Linearity vs Output Code, Unipolar ...

Page 7

PIN FUNCTIONS SDO (Pin 1): Three-State Serial Data Output. Each set of six output data words represent the six analog input channels at the start of the previous conversion. Data for CH0 comes out fi rst and data for CH5 ...

Page 8

LTC2351-14 PIN FUNCTIONS V (Pin 25): 3V Positive Digital Supply. This pin sup- DD plies 3V to the logic section. Bypass to DGND pin and solid analog ground plane with a 10μF ceramic capacitor (or 10μF tantalum in parallel with ...

Page 9

BLOCK DIAGRAM + CH0 + 4 S & H – CH0 – CH1 + 7 S & H – CH1 – CH2 + 10 S & H – CH2 – ...

Page 10

LTC2351-14 TIMING DIAGRAMS SCK 10 235114fb ...

Page 11

TIMING DIAGRAMS SCK CONV NAP SLEEP V REF NOTE: NAP AND SLEEP ARE INTERNAL SIGNALS SCK SDO Nap Mode and Sleep Mode Waveforms t 1 SCK to SDO Delay SCK SDO V ...

Page 12

LTC2351-14 APPLICATIONS INFORMATION SELECTING THE NUMBER OF CONVERTED CHANNELS (SEL2, SEL1, SEL0) These three control pins select the number of channels being converted. 000 selects only the fi rst channel (CH0) for conversion. Incrementing SELx selects additional channels for conversion, ...

Page 13

... DC accuracy and settling time are most critical. The following list is a summary of the op amps that are suitable for driving the LTC2351-14. More detailed information is available in the Linear Technology Databooks and on the Web site at www.linear.com. LTC2351-14 LTC1566-1: Low Noise 2.3MHz Continuous Time Lowpass Filter ...

Page 14

LTC2351-14 APPLICATIONS INFORMATION INPUT FILTERING AND SOURCE IMPEDANCE The noise and the distortion of the input amplifi er and other circuitry must be considered since they will add to the LTC2351-14 noise and distortion. The small-signal bandwidth of the sample-and-hold ...

Page 15

APPLICATIONS INFORMATION INPUT SPAN VERSUS REFERENCE VOLTAGE The differential input range has a unipolar voltage span that equals the difference between the voltage at the reference buffer output V (Pin 23) and the voltage at REF ground. The differential input ...

Page 16

LTC2351-14 APPLICATIONS INFORMATION POWER-DOWN MODES Upon power-up, the LTC2351-14 is initialized to the active state and is ready for conversion. The nap and sleep mode waveforms show the power down modes for the LTC2351-14. The SCK and CONV inputs control ...

Page 17

APPLICATIONS INFORMATION and then buffer this signal with the appropriate number of inverters to drive the serial clock input of the processor serial port. Use the falling edge of the clock to latch data from the serial data output (SDO) ...

Page 18

LTC2351-14 APPLICATIONS INFORMATION HARDWARE INTERFACE TO TMS320C54x The LTC2351- serial output ADC whose interface has been designed for high speed buffered serial ports in fast digital signal processors (DSPs). Figure 7 shows an example of this interface using ...

Page 19

... ON THE TOP AND BOTTOM OF PACKAGE Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. UH Package 32-Lead Plastic QFN (5mm × ...

Page 20

... LTC1666/LTC1667 12-/14-/16-Bit, 50Msps DAC LTC1668 References LT1460-2.5 Micropower Series Voltage Reference LT1461-2.5 Precision Voltage Reference LT1790-2.5 Micropower Series Reference in SOT-23 SoftSpan is a trademark of Linear Technology Corporation. Linear Technology Corporation 20 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● NC7SVU04P5X 0.1μ ...

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