FeaTures

n

LTC2345-16

Octal, 16-Bit, 200ksps

Differential SoftSpan ADC with

Wide Input Common Mode Range

DescripTion

The

LTC

®

2345-16

is a 16-bit, low noise 8-channel si-

multaneous sampling successive approximation register

(SAR) ADC with differential, wide common mode range

inputs. Operating from a 5V low voltage supply and us-

ing the internal reference and buffer, each channel of this

SoftSpan

TM

ADC can be independently configured on a

conversion-by-conversion basis to accept ±4.096, 0V

to 4.096V, ±2.048V, or 0V to 2.048V signals. Individual

channels may also be disabled to increase throughput on

the remaining channels.

The wide input common mode range and 102dB CMRR of

the LTC2345-16 analog inputs allow the ADC to directly

digitize a variety of signals, simplifying signal chain design.

This input signal flexibility, combined with ±1.25LSB INL,

no missing codes at 16 bits, and 91dB SNR, makes the

LTC2345-16 an ideal choice for many applications requir-

ing wide dynamic range.

The LTC2345-16 supports pin-selectable SPI CMOS (1.8V

to 5V) and LVDS serial interfaces. Between one and eight

lanes of data output may be employed in CMOS mode,

allowing the user to optimize bus width and throughput.

L,

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673.

Other Patents pending.

n

200ksps per Channel Throughput

Eight Simultaneous Sampling Channels

±1.25LSB INL (Maximum)

Guaranteed 16-Bit, No Missing Codes

Differential, Wide Common Mode Range Inputs

Per-Channel SoftSpan Input Ranges:

±4.096V, 0V to 4.096V, ±2.048V, 0V to 2.048V

±5V, 0V to 5V, ±2.5V, 0V to 2.5V

91dB Single-Conversion SNR (Typical)

−113dB THD (Typical) at f

IN

= 2kHz

102dB CMRR (Typical) at f

IN

= 200Hz

Rail-to-Rail Input Overdrive Tolerance

Guaranteed Operation to 125°C

Integrated Reference and Buffer (4.096V)

SPI CMOS (1.8V to 5V) and LVDS Serial I/O

Internal Conversion Clock, No Cycle Latency

81mW Power Dissipation (Typical)

48-Lead (7mm x 7mm) QFN Package

applicaTions

n

Programmable Logic Controllers

Industrial Process Control

Medical Imaging

High Speed Data Acquisition

Typical applicaTion

5V

0.1µF

2.2µF

1.8V TO 5V

0.1µF

Integral Nonlinearity vs

Output Code and Channel

1.00

0.75

0.50

INL ERROR (LSB)

0.25

0

–0.25

–0.50

SAMPLE

CLOCK

–0.75

–1.00

–32768

–16384

0

16384

OUTPUT CODE

32768

234516 TA01b

CMOS OR LVDS

I/O INTERFACE

5V

ARBITRARY

FULLY

DIFFERENTIAL

5V

IN0+

S/H

IN0–

S/H

0V

BIPOLAR

0V

• • •

UNIPOLAR

S/H

IN7+

S/H

IN7–

EIGHT SIMULTANEOUS

SAMPLING CHANNELS

S/H

REFBUF

47µF

V

DD

V

DDLBYP

OV

DD

LVDS/CMOS

PD

±4.096V RANGE

FULLY DIFFERENTIAL DRIVE (IN

–

= –IN

+

)

ALL CHANNELS

LTC2345-16

SDO0

• • •

MUX

16-BIT

SAR ADC

SDO7

SCKO

SCKI

SDI

CS

BUSY

CNV

GND

234516 TA01a

5V

0V

DIFFERENTIAL INPUTS

IN+/IN–

WITH

WIDE INPUT COMMON MODE RANGE

REFIN

0.1µF

234516f

For more information

www.linear.com/LTC2345-16

1

LTC2345-16

absoluTe MaxiMuM raTings

(Notes 1, 2)

pin conFiguraTion

TOP VIEW

IN7+

IN7–

GND

V

DD

V

DD

GND

V

DDLBYP

CS

BUSY

SDI

IN6–

IN6+

IN5–

IN5+

IN4–

IN4+

IN3–

IN3+

IN2–

IN2+

IN1–

IN1+

48

47

46

45

44

43

42

41

40

39

38

37

Supply Voltage (V

DD

) ..................................................6V

Supply Voltage (OV

DD

) ................................................6V

Internal Regulated Supply Bypass (V

DDLBYP

) ... (Note 3)

Analog Input Voltage

IN0

+

to IN7

+

,

IN0

–

to IN7

–

(Note 4) ................(–0.3V) to (V

DD

+ 0.3V)

REFIN.................................................... –0.3V to 2.8V

REFBUF, CNV (Note 4) ............. –0.3V to (V

DD

+ 0.3V)

Digital Input Voltage (Note 4)..... –0.3V to (OV

DD

+ 0.3V)

Digital Output Voltage (Note 4) .. –0.3V to (OV

DD

+ 0.3V)

Power Dissipation .............................................. 500mW

Operating Temperature Range

LTC2345C ................................................ 0°C to 70°C

LTC2345I .............................................–40°C to 85°C

LTC2345H .......................................... –40°C to 125°C

Storage Temperature Range .................. –65°C to 150°C

1

2

3

4

5

6

7

8

9

10

11

12

49

GND

36

35

34

33

32

31

30

29

28

27

26

25

SDO7

SDO–/SDO6

SDO+/SDO5

SCKO–/SDO4

SCKO+/SCKO

OV

DD

GND

SCKI–/SCKI

SCKI+/SDO3

SDI–/SDO2

SDI+/SDO1

SDO0

T

JMAX

= 150°C,

θ

JA

= 34°C/W

EXPOSED PAD (PIN 49) IS GND, MUST BE SOLDERED TO PCB

orDer inForMaTion

LEAD FREE FINISH

LTC2345CUK-16#PBF

LTC2345IUK-16#PBF

LTC2345HUK-16#PBF

TAPE AND REEL

(http://www.linear.com/product/LTC2345-16#orderinfo)

PART MARKING*

LTC2345UK-16

PACKAGE DESCRIPTION

48-Lead (7mm × 7mm) Plastic QFN

TEMPERATURE RANGE

0°C to 70°C

–40°C to 85°C

–40°C to 125°C

LTC2345CUK-16#TRPBF

LTC2345IUK-16#TRPBF

LTC2345HUK-16#TRPBF

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.

IN0–

IN0+

GND

REFIN

GND

REFBUF

PD

LVDS/CMOS

CNV

UK PACKAGE

48-LEAD (7mm

×

7mm) PLASTIC QFN

13

14

15

16

17

18

19

20

21

22

23

24

234516f

2

For more information

www.linear.com/LTC2345-16

LTC2345-16

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. (Note 5)

SYMBOL

V

IN

+

V

IN

–

PARAMETER

Absolute Input Range

(IN0

+

to IN7

+

)

Absolute Input Range

(IN0

–

to IN7

–

)

CONDITIONS

(Note 6)

SoftSpan 7: ±V

REFBUF

Range (Note 6)

SoftSpan 6: ±V

REFBUF

/1.024 Range (Note 6)

SoftSpan 5: 0V to V

REFBUF

Range (Note 6)

SoftSpan 4: 0V to V

REFBUF

/1.024 Range (Note 6)

SoftSpan

3: ±0.5 •

V

REFBUF

Range (Note 6)

SoftSpan

2: ±0.5 •

V

REFBUF

/1.024 Range (Note 6)

SoftSpan 1: 0V to

0.5 •

V

REFBUF

Range (Note 6)

l

elecTrical characTerisTics

MIN

0

– V

REFBUF

– V

REFBUF

/1.024

0

–0.5 •

V

REFBUF

–0.5 •

V

REFBUF

/1.024

0

−V

DD

–1

TYP

MAX

V

DD

V

DD

V

REFBUF

V

REFBUF

/1.024

V

REFBUF

V

REFBUF

/1.024

0.5 •

V

REFBUF

0.5 •

V

REFBUF

/1.024

0.5 •

V

REFBUF

V

DD

V

DD

1

UNITS

V

µA

pF

dB

V

IN

+ – V

IN

– Input Differential Voltage

Range

V

CM

Input Common Mode Voltage (Note 6)

Range

(Note 7)

V

IN

+ – V

IN

– Input Differential Overdrive

Tolerance

I

IN

C

IN

CMRR

V

IHCNV

V

ILCNV

I

INCNV

Analog Input Leakage Current

Analog Input Capacitance

Input Common Mode

Rejection Ratio

CNV High Level Input Voltage

CNV Low Level Input Voltage

CNV Input Current

Sample Mode

Hold Mode

V

IN

+ = V

IN

− = 3.6V

P-P

200Hz Sine

l

50

10

84

1.3

0.5

–10

10

102

V

μA

V

IN

= 0V to V

DD

l

temperature range, otherwise specifications are at T

A

= 25°C. (Note 8)

SYMBOL

PARAMETER

Resolution

No Missing Codes

Transition Noise

CONDITIONS

converTer characTerisTics

The

l

denotes the specifications which apply over the full operating

MIN

l

TYP

MAX

UNITS

Bits

16

0.63

1.2

2.3

SoftSpans 7 and 6: ±4.096V and ±4V Ranges

SoftSpans 5 and 4: 0V to 4.096V and 0V to 4V Ranges

SoftSpans 3 and 2: ±2.048V and ±2V Ranges

SoftSpan 1: 0V to 2.048V Range

(Note 9)

(Note 11)

l

LSB

RMS

LSB

RMS

LSB

RMS

LSB

RMS

1.25

0.9

750

0.13

LSB

μV

μV/°C

%FS

ppm/°C

INL

DNL

ZSE

FSE

Integral Linearity Error

Zero-Scale Error

Zero-Scale Error Drift

Full-Scale Error

Full-Scale Error Drift

–1.25

−0.9

−750

−0.13

±0.50

±0.20

±65

±2

±0.025

±2.5

Differential Linearity Error (Note 10)

l

234516f

For more information

www.linear.com/LTC2345-16

3

LTC2345-16

DynaMic accuracy

SYMBOL PARAMETER

SINAD

Signal-to-(Noise +

Distortion) Ratio

The

l

denotes the specifications which apply over the full operating temperature range,

otherwise specifications are at T

A

= 25°C. A

IN

= –1dBFS. (Notes 8, 12)

CONDITIONS

SoftSpans 7 and 6: ±4.096V and ±4V Ranges, f

IN

= 2kHz

SoftSpans 5 and 4: 0V to 4.096V and 0V to 4V Ranges, f

IN

= 2kHz

SoftSpans 3 and 2: ±2.048V and ±2V Ranges, f

IN

= 2kHz

SoftSpan 1: 0V to 2.048V Range, f

IN

= 2kHz

SoftSpans 7 and 6: ±4.096V and ±4V Ranges, f

IN

= 2kHz

SoftSpans 5 and 4: 0V to 4.096V and 0V to 4V Ranges, f

IN

= 2kHz

SoftSpans 3 and 2: ±2.048V and ±2V Ranges, f

IN

= 2kHz

SoftSpan 1: 0V to 2.048V Range, f

IN

= 2kHz

SoftSpans 7 and 6: ±4.096V and ±4V Ranges, f

IN

= 2kHz

SoftSpans 5 and 4: 0V to 4.096V and 0V to 4V Ranges, f

IN

= 2kHz

SoftSpans 3 and 2: ±2.048V and ±2V Ranges, f

IN

= 2kHz

SoftSpan 1: 0V to 2.048V Range, f

IN

= 2kHz

SoftSpans 7 and 6: ±4.096V and ±4V Ranges, f

IN

= 2kHz

SoftSpans 5 and 4: 0V to 4.096V and 0V to 4V Ranges, f

IN

= 2kHz

SoftSpans 3 and 2: ±2.048 and ±2V Ranges, f

IN

= 2kHz

SoftSpan 1: 0V to 2.048V Range, f

IN

= 2kHz

One Channel Converting 3.6V

P-P

200Hz Sine in ±2.048V Range,

Crosstalk to All Other Channels

l

MIN

87.2

81.3

81.4

75.7

87.3

81.5

81.6

75.8

TYP

91.0

85.6

85.8

80.0

91.0

85.6

85.8

80.0

–113

–111

–110

–108

MAX

UNITS

dB

SNR

Signal-to-Noise Ratio

THD

Total Harmonic Distortion

–99

–95

–96

–95

dB

MHz

ns

ps

RMS

ns

SFDR

Spurious Free Dynamic

Range

99

95

96

114

113

112

109

−107

31

1

150

3

Channel-to-Channel

Crosstalk

–3dB Input Bandwidth

Aperture Delay

Aperture Delay Matching

Aperture Jitter

Transient Response

Full-Scale Step, 0.005% Settling

200

operating temperature range, otherwise specifications are at T

A

= 25°C. (Note 8)

SYMBOL

V

REFIN

PARAMETER

Internal Reference Output Voltage

Internal Reference Temperature Coefficient

Internal Reference Line Regulation

Internal Reference Output Impedance

V

REFIN

REFIN Voltage Range

REFIN Overdriven (Note 6)

(Note 13)

V

DD

= 4.75V to 5.25V

CONDITIONS

inTernal reFerence characTerisTics

The

l

denotes the specifications which apply over the full

MIN

2.043

l

TYP

2.048

5

0.1

20

MAX

2.053

20

UNITS

V

ppm/°C

mV/V

kΩ

1.25

2.2

V

234516f

4

For more information

www.linear.com/LTC2345-16

LTC2345-16

The

l

denotes the specifications which apply over the full

operating temperature range, otherwise specifications are at T

A

= 25°C. (Note 8)

SYMBOL

V

REFBUF

PARAMETER

Reference Buffer Output Voltage

REFBUF Voltage Range

REFBUF Input Impedance

I

REFBUF

REFBUF Load Current

CONDITIONS

REFIN Overdriven, V

REFIN

= 2.048V

REFBUF Overdriven (Notes 6, 14)

V

REFIN

= 0V, Buffer Disabled

V

REFBUF

= 5V, 8 Channels Enabled (Notes 14, 15)

V

REFBUF

= 5V, Acquisition Mode (Note 14)

l

reFerence buFFer characTerisTics

MIN

4.091

2.5

TYP

4.096

13

1.5

0.39

MAX

4.101

5

1.9

UNITS

V

kΩ

mA

The

l

denotes the specifications which apply over the

full operating temperature range, otherwise specifications are at T

A

= 25°C. (Note 8)

SYMBOL

V

IH

V

IL

I

IN

C

IN

V

OH

V

OL

I

OZ

I

SOURCE

I

SINK

V

ID

R

ID

V

ICM

I

ICM

V

OD

V

OCM

I

OZ

PARAMETER

High Level Input Voltage

Low Level Input Voltage

Digital Input Current

Digital Input Capacitance

High Level Output Voltage

Low Level Output Voltage

Hi-Z Output Leakage Current

Output Source Current

Output Sink Current

Differential Input Voltage

On-Chip Input Termination

Resistance

Common-Mode Input Voltage

Common-Mode Input Current

Differential Output Voltage

Common-Mode Output Voltage

Hi-Z Output Leakage Current

V

IN

+ = V

IN

– = 0V to OV

DD

R

L

= 100Ω Differential Termination

R

L

= 100Ω Differential Termination

V

OUT

= 0V to OV

DD

CS

= 0V, V

ICM

= 1.2V

CS

= OV

DD

I

OUT

= –500μA

I

OUT

= 500μA

V

OUT

= 0V to OV

DD

V

OUT

= 0V

V

OUT

= OV

DD

l

OV

DD

– 0.2

l

DigiTal inpuTs anD DigiTal ouTpuTs

CONDITIONS

MIN

l

0.8 • OV

DD

l

TYP

MAX

UNITS

V

CMOS Digital Inputs and Outputs

0.2 • OV

DD

–10

5

0.2

–10

–50

50

200

80

0.3

–10

275

1.1

–10

350

1.2

350

106

10

1.2

600

130

2.2

10

425

1.3

10

V

μA

pF

V

μA

mA

mV

Ω

MΩ

V

μA

mV

V

μA

V

IN

= 0V to OV

DD

l

LVDS Digital Inputs and Outputs

234516f

For more information

www.linear.com/LTC2345-16

5

参数名称	属性值
Product Attribute	Attribute Value
制造商 Manufacturer	ADI(亚德诺半导体)
产品种类 Product Category	Analog to Digital Converters - ADC
RoHS	Details
安装风格 Mounting Style	SMD/SMT
封装 / 箱体 Package / Case	QFN-48
Resolution	16 bit
Number of Channels	8 Channel
Sampling Rate	200 kS/s
Input Type	Differential
接口类型 Interface Type	Serial
Architecture	SAR
Reference Type	Internal
Analog Supply Voltage	5 V
最小工作温度 Minimum Operating Temperature	- 40 C
最大工作温度 Maximum Operating Temperature	+ 125 C
系列 Packaging	Tube
Number of Converters	1 Converter
产品 Product	Analog to Digital Converters
类型 Type	Precision
Shutdown	Shutdown
Development Kit	DC2326A-B
DNL - Differential Nonlinearity	0.2 LSB
Gain Error	16 LSB
INL - Integral Nonlinearity	0.5 LSB
Pd-功率耗散 Pd - Power Dissipation	81 mW
SFDR - Spurious Free Dynamic Range	114 dB
SINAD - Signal to Noise and Distortion Ratio	91 dB
工厂包装数量 Factory Pack Quantity	52
THD - Total Harmonic Distortion	- 113 dB
单位重量 Unit Weight	0.016297 oz

LTC2345IUK-16#PBF

LTC2345IUK-16#PBF概述

LTC2345IUK-16#PBF规格参数

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