LTC2351HUH-12#PBF Linear Technology, LTC2351HUH-12#PBF Datasheet

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LTC2351HUH-12#PBF

Manufacturer Part Number
LTC2351HUH-12#PBF
Description
IC ADC 12BIT 1.5MSPS 32-QFN
Manufacturer
Linear Technology
Datasheet

Specifications of LTC2351HUH-12#PBF

Number Of Bits
12
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-12#PBFLTC2351HUH-12
Manufacturer:
LT
Quantity:
10 000
FEATURES
APPLICATIONS
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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 6 Simultaneously Sampled
Differential Inputs
250ksps Throughput per Channel
72dB 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
CH5
S AND H
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
33
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
LTC2351-12 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.
5
S AND H
CH0
6 Channel, 12-Bit, 1.5Msps
REFERENCE
2.5V
22
GND
4
CH0
®
+
10μF
2351-12 is a 12-bit, 1.5Msps ADC with six simul-
23
12-BIT ADC
V
10μF
REF
1.5Msps
29
BIP
24
V
CC
3V
25
26
12-BIT LATCH 0
12-BIT LATCH 1
12-BIT LATCH 2
12-BIT LATCH 3
12-BIT LATCH 4
12-BIT LATCH 5
SEL2 SEL1 SEL0
V
With Shutdown
DD
TIMING
LOGIC
27
28
LTC2351-12
OUTPUT
THREE-
SERIAL
STATE
PORT
235112 TA01
30
32
31
3
1
2
OV
3V
SD0
OGND
CONV
SCK
DGND
DD
235112fa
0.1μF
1

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LTC2351HUH-12#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-12#PBF LTC2351CUH-12#TRPBF LTC2351IUH-12#PBF LTC2351IUH-12#TRPBF LTC2351HUH-12#PBF LTC2351HUH-12#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel 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

LTC2351-12 DIGITAL INPUTS AND DIGITAL OUTPUTS full operating temperature range, otherwise specifi cations are at T SYMBOL PARAMETER V High Level Input Voltage IH V Low Level Input Voltage IL I Digital Input Current IN C Digital Input Capacitance IN ...

Page 5

TIMING CHARACTERISTICS range, otherwise specifi cations are SYMBOL PARAMETER t SCK↑ to Hi-Z at SDO 9 t Previous SDO Bit Remains Valid After SCK Settling Time After Sleep-to-Wake Transition 11 REF Note 1: Stresses ...

Page 6

LTC2351-12 TYPICAL PERFORMANCE CHARACTERISTICS SINAD vs Input Frequency 0.1 1 FREQUENCY (MHz) 235112 G01 SFDR vs Input Frequency 0.1 1 FREQUENCY (MHz) 235112 G04 ...

Page 7

TYPICAL PERFORMANCE CHARACTERISTICS Full Scale Signal Response 3 0 –3 –6 –9 –12 –15 –18 –21 –24 –27 –30 10 100 FREQUENCY (MHz) Crosstalk vs Frequency 0 –20 –40 –60 –80 –100 –120 100 1k 10k 100k FREQUENCY (Hz) 0 ...

Page 8

LTC2351-12 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 ...

Page 9

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 0.1μF ...

Page 10

LTC2351-12 BLOCK DIAGRAM + CH0 + 4 S & H – CH0 – CH1 + 7 S & H – CH1 – CH2 + 10 S & H – CH2 – ...

Page 11

TIMING DIAGRAMS SCK LTC2351-12 235112fa 11 ...

Page 12

LTC2351-12 TIMING DIAGRAMS SCK CONV NAP SLEEP V REF NOTE: NAP AND SLEEP ARE INTERNAL SIGNALS SCK SDO 12 Nap Mode and Sleep Mode Waveforms t 1 SCK to SDO Delay SCK ...

Page 13

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, up ...

Page 14

... DC accuracy and settling time are most critical. The following list is a summary of the op amps that are suitable for driving the LTC2351-12. (More detailed information is available in the Linear Technology Databooks and on the website at www.linear.com.) LTC1566-1: Low Noise 2.3MHz Continuous Time Lowpass Filter. ...

Page 15

APPLICATIONS INFORMATION 51Ω* 1 ANALOG CH0 INPUT 47pF* 2 CH0 LTC2351- REF 10μF 11 GND 51Ω* ANALOG 4 CH1 INPUT 47pF* 5 CH1 *TIGHT TOLERANCE REQUIRED TO AVOID APERTURE SKEW DEGRADATION Figure 1. RC Input Filter net input ...

Page 16

LTC2351-12 APPLICATIONS INFORMATION 0 –20 –40 –60 –80 –100 –120 100 1k 10k 100k 1M 10M 100M 1G FREQUENCY (Hz) Figure 3. CMRR vs Frequency 111...111 111...110 111...101 000...010 000...001 000...000 0 INPUT VOLTAGE (V) Figure 4. LTC2351-12 Transfer Characteristic ...

Page 17

APPLICATIONS INFORMATION DIGITAL INTERFACE The LTC2351-12 has a 3-wire SPI (Serial Peripheral Interface) interface. The SCK and CONV inputs and SDO output implement this interface. The SCK and CONV inputs accept swings from 3V logic and are TTL compatible, if ...

Page 18

LTC2351-12 APPLICATIONS INFORMATION the rising edge of CONV. The six or fewer 12-bit words are separated by two don’t care bits and two clock cycles in high impedance mode. Please note the delay specifi cation from SCK to a valid ...

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. corruption of the signal to LTC2351-12. This confi guration ...

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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