FEATURES

n

LTC2341-16

Dual, 16-Bit, 666ksps/ch

Differential SoftSpan ADC with

Wide Input Common Mode Range

DESCRIPTION

The

LTC

®

2341-16

is a 16-bit, low noise 2-channel simulta-

neous sampling successive approximation register (SAR)

ADC with differential, wide common mode range inputs.

Operating from a 5V supply and using the internal reference

and buffer, both channels of this SoftSpan

TM

ADC can be

independently configured on a conversion-by-conversion

basis to accept ±4.096V, 0V to 4.096V, ±2.048V, or 0V

to 2.048V signals. One channel may also be disabled to

increase throughput on the other channel.

The wide input common mode range and 105dB CMRR of

the LTC2341-16 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 93.4dB SNR, makes the

LTC2341-16 an ideal choice for many applications requir-

ing wide dynamic range.

The LTC2341-16 supports pin-selectable SPI CMOS (1.8V

to 5V) and LVDS serial interfaces. Either one or two 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,

9197235.

n

666ksps per Channel Throughput

Two 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

93.4dB Single-Conversion SNR (Typical)

−114dB THD (Typical) at f

IN

= 2kHz

105dB 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

74mW Power Dissipation (Typical)

32-Lead (5mm

×

5mm) 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

CMOS OR LVDS

I/O INTERFACE

V

DD

IN0+

S/H

IN0–

0V

BIPOLAR

0V

UNIPOLAR

IN1+

S/H

IN1–

0V

TWO SIMULTANEOUS

SAMPLING CHANNELS

REFBUF

47µF

Integral Nonlinearity vs

Output

Code and Channel

vs Output

Code and Channel

1.00

0.75

0.50

INL ERROR (LSB)

0.25

0

–0.25

–0.50

SAMPLE

CLOCK

5V

ARBITRARY

FULLY

DIFFERENTIAL

5V

V

DDLBYP

LTC2341-16

OV

DD

LVDS/CMOS

PD

±4.096V RANGE

FULLY DIFFERENTIAL DRIVE (IN

–

= –IN

+

)

ALL CHANNELS

MUX

16-BIT

SAR ADC

5V

REFIN

0.1µF

GND

SDO0

SDO1

SCKO

SCKI

SDI

CS

BUSY

CNV

234116 TA01a

–0.75

–1.00

–32768

–16384

0

16384

OUTPUT CODE

32768

234116 TA01b

DIFFERENTIAL INPUTS

IN+/IN–

WITH

WIDE INPUT COMMON MODE RANGE

234116f

For more information

www.linear.com/LTC2341-16

1

LTC2341-16

ABSOLUTE MAXIMUM RATINGS

(Notes 1, 2)

PIN CONFIGURATION

TOP VIEW

SDO

–

/SDI

24 SDO

+

23 SCKO

–

/SDO1

22 SCKO

+

/SCKO

33

GND

21 OV

DD

20 GND

19 SCKI

–

/SCKI

18 SCKI

+

/SDO0

17 SDI

–

9 10 11 12 13 14 15 16

REFIN

PD

LVDS/CMOS

GND

REFBUF

CNV

SDI

+

V

DDLBYP

BUSY

GND

Supply Voltage (V

DD

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

Supply Voltage (OV

DD

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

Internal Regulated Supply Bypass (V

DDLBYP

) ... (Note 3)

Analog Input Voltage

IN0

+

, IN1

+

,

IN0

–

, IN1

–

(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

LTC2341C ................................................ 0°C to 70°C

LTC2341I..............................................–40°C to 85°C

LTC2341H .......................................... –40°C to 125°C

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

V

DD

32 31 30 29 28 27 26 25

IN1

–

1

IN1

+

2

GND 3

GND 4

GND 5

GND 6

IN0

–

7

IN0

+

8

UH PACKAGE

32-LEAD (5mm

×

5mm) PLASTIC QFN

T

JMAX

= 150°C,

θ

JA

= 44°C/W

EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB

ORDER INFORMATION

LEAD FREE FINISH

LTC2341CUH-16#PBF

LTC2341IUH-16#PBF

LTC2341HUH-16#PBF

TAPE AND REEL

http://www.linear.com/product/LTC2341-16#orderinfo

PART MARKING*

234116

PACKAGE DESCRIPTION

32-Lead (5mm × 5mm) Plastic QFN

TEMPERATURE RANGE

0°C to 70°C

–40°C to 85°C

–40°C to 125°C

LTC2341CUH-16#TRPBF

LTC2341IUH-16#TRPBF

LTC2341HUH-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.

CS

2

234116f

For more information

www.linear.com/LTC2341-16

LTC2341-16

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

+

, IN1

+

)

Absolute Input Range

(IN0

–

, IN1

–

)

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

90

10

88

1.3

0.5

–10

10

105

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

0.39

0.76

1.6

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)

V

REFBUF

= 4.096V (REFBUF Overdriven) (Note 11)

l

LSB

RMS

LSB

RMS

LSB

RMS

LSB

RMS

1.25

0.9

500

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

−500

−0.13

±0.30

±0.20

±65

±2

±0.025

±2.5

Differential Linearity Error (Note 10)

l

234116f

For more information

www.linear.com/LTC2341-16

3

LTC2341-16

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 Other Channel

l

MIN

90.4

85.0

79.4

90.6

85.1

85.2

79.5

TYP

93.4

88.7

83.3

93.4

88.7

83.3

–114

–111

–110

–109

MAX

UNITS

dB

SNR

Signal-to-Noise Ratio

THD

Total Harmonic Distortion

–99

–95

–96

–97

dB

MHz

ns

ps

RMS

ns

SFDR

Spurious Free Dynamic

Range

99

95

96

97

115

112

111

110

−119

22

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

210

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

4

234116f

For more information

www.linear.com/LTC2341-16

LTC2341-16

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, 2 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

1.3

0.35

MAX

4.101

5

1.6

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

234116f

For more information

www.linear.com/LTC2341-16

5

参数名称	属性值
位数	16
采样率（每秒）	666k
输入数	2
输入类型	差分
数据接口	LVDS - 串行，SPI
配置	S/H-MUX-ADC
无线电 - S/H:ADC	1：1
A/D 转换器数	1
架构	SAR
参考类型	外部，内部
电压 - 电源，模拟	5V
电压 - 电源，数字	5V
特性	同步采样
工作温度	-40°C ~ 85°C
封装/外壳	32-WFQFN 裸露焊盘
供应商器件封装	32-QFN（5x5）

LTC2341IUH-16#TRPBF

LTC2341IUH-16#TRPBF概述

LTC2341IUH-16#TRPBF规格参数

文档预览

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