LTC1744

14-Bit, 50Msps ADC

FEATURES

s

DESCRIPTIO

s

Sample Rate: 50Msps

77dB SNR and 87dB SFDR (3.2V Range)

73.5dB SNR and 90dB SFDR (2V Range)

No Missing Codes

Single 5V Supply

Power Dissipation: 1.2W

Selectable Input Ranges:

±1V

or

±1.6V

150MHz Full Power Bandwidth S/H

Pin Compatible Family

25Msps: LTC1746 (14 Bit), LTC1745 (12 Bit)

50Msps: LTC1744 (14 Bit), LTC1743 (12 Bit)

65Msps: LTC1742 (14 Bit), LTC1741 (12 Bit)

80Msps: LTC1748 (14 Bit), LTC1747 (12 Bit)

48-Pin TSSOP Package

The LTC

®

1744 is a 50Msps, sampling 14-bit A/D con-

verter designed for digitizing high frequency, wide dynamic

range signals. Pin selectable input ranges of

±1V

and

±1.6V

along with a resistor programmable mode allow the

LTC1744’s input range to be optimized for a wide variety

of applications.

The LTC1744 is perfect for demanding communications

applications with AC performance that includes 77dB

SNR and 87dB spurious free dynamic range. Ultralow jitter

of 0.3ps

RMS

allows undersampling of IF frequencies with

excellent noise performance. DC specs include

±4LSB

maximum INL and no missing codes over temperature.

The digital interface is compatible with 5V, 3V and 2V logic

systems. The ENC and ENC inputs may be driven differen-

tially from PECL, GTL and other low swing logic families or

from single-ended TTL or CMOS. The low noise, high gain

ENC and ENC inputs may also be driven by a sinusoidal

signal without degrading performance. A separate output

power supply can be operated from 0.5V to 5V, making it

easy to connect directly to any low voltage DSPs or FIFOs.

The TSSOP package with a flow-through pinout simplifies

the board layout.

APPLICATIO S

s

Telecommunications

Receivers

Base Stations

Spectrum Analysis

Imaging Systems

, LTC and LT are registered trademarks of Linear Technology Corporation.

BLOCK DIAGRA

A

IN+

±1V

DIFFERENTIAL

ANALOG INPUT

50Msps, 14-Bit ADC with a

±1V

Differential Input Range

OV

DD

0.1µF

CORRECTION

LOGIC AND

SHIFT

REGISTER

14

OF

D13

D0

CLKOUT

0.5V TO 5V

0.1µF

A

IN–

S/H

CIRCUIT

14-BIT

PIPELINED ADC

SENSE

BUFFER

RANGE

SELECT

DIFF AMP

GND

CONTROL LOGIC

1744 BD

V

CM

4.7µF

2.5V

REF

REFLB

REFHA

4.7µF

REFLA

REFHB ENC

ENC

0.1µF

1µF

0.1µF

1µF

DIFFERENTIAL

ENCODE INPUT

U

OUTPUT

LATCHES

•

OGND

V

DD

1µF

5V

1µF

MSBINV

OE

W

U

1744f

1

LTC1744

ABSOLUTE

MAXIMUM

RATINGS

OV

DD

= V

DD

(Notes 1, 2)

PACKAGE/ORDER INFORMATION

TOP VIEW

SENSE

V

CM

GND

A

IN+

A

IN–

GND

V

DD

V

DD

GND

REFLB

REFHA

GND

REFLA

REFHB

GND

V

DD

V

DD

GND

V

DD

GND

MSBINV

ENC

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

FW PACKAGE

48-LEAD PLASTIC TSSOP

48

47

46

45

44

43

42

41

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

OF

OGND

D13

D12

D11

OV

DD

D10

D9

D8

D7

OGND

GND

D6

D5

D4

OV

DD

D3

D2

D1

D0

OGND

CLKOUT

OE

Supply Voltage (V

DD

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

Analog Input Voltage (Note 3) .... – 0.3V to (V

DD

+ 0.3V)

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

DD

+ 0.3V)

Digital Output Voltage ................. – 0.3V to (V

DD

+ 0.3V)

OGND Voltage ..............................................– 0.3V to 1V

Power Dissipation ............................................ 2000mW

Operating Temperature Range

LTC1744C ............................................... 0°C to 70°C

LTC1744I ............................................ – 40°C to 85°C

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

Lead Temperature (Soldering, 10 sec).................. 300°C

ORDER PART

NUMBER

LTC1744CFW

LTC1744IFW

T

JMAX

= 150°C,

θ

JA

= 35°C/W

Consult factory for parts specified with wider operating temperature ranges.

CO VERTER CHARACTERISTICS

PARAMETER

Resolution (No Missing Codes)

Integral Linearity Error

Differential Linearity Error

Offset Error

Gain Error

Full-Scale Tempco

The

q

indicates specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. (Note 5)

CONDITIONS

q

MIN

14

–4

–1

– 20

–3

q

TYP

±1

±0.5

±5

±1

±40

MAX

4

1.5

20

3

UNITS

Bits

LSB

mV

%FS

ppm/°C

(Note 6)

(Note 7)

External Reference (SENSE = 1.6V)

I

OUT(REF)

= 0

A ALOG I PUT

SYMBOL

V

IN

I

IN

C

IN

t

ACQ

t

AP

t

JITTER

CMRR

PARAMETER

The

q

indicates specifications which apply over the full operating temperature range, otherwise

specifications are at T

A

= 25°C. (Note 5)

CONDITIONS

4.75V

≤

V

DD

≤

5.25V

Sample Mode ENC < ENC

Hold Mode ENC > ENC

q

MIN

TYP

±1

to

±1.6

10

15

8

7.5

0

0.3

MAX

UNITS

V

nA

pF

Analog Input Range (Note 8)

Analog Input Leakage Current

Analog Input Capacitance

Sample-and-Hold Acquisition Time

Sample-and-Hold Acquisition Delay Time

Sample-and-Hold Acquisition Delay Time Jitter

Analog Input Common Mode Rejection Ratio

9.5

ps

RMS

dB

1744f

1.0V < (A

IN–

= A

IN+

) < 3.5V

80

2

U

W

U

W W

W

U

ns

LTC1744

DY A IC ACCURACY

SYMBOL

SNR

PARAMETER

Signal-to-Noise Ratio

The

q

indicates specifications which apply over the full operating temperature range,

otherwise specifications are at T

A

= 25°C. A

IN

= –1dBFS. (Note 5)

CONDITIONS

5MHz Input Signal (2V Range)

5MHz Input Signal (3.2V Range)

25MHz Input Signal (2V Range)

25MHz Input Signal (3.2V Range)

70MHz Input Signal (2V Range)

70MHz Input Signal (3.2V Range)

SFDR

Spurious Free Dynamic Range

5MHz Input Signal (2V Range)

5MHz Input Signal (3.2V Range)

25MHz Input Signal (2V Range)

25MHz Input Signal (3.2V Range)

70MHz Input Signal (2V Range)

70MHz Input Signal (3.2V Range)

S/(N + D)

Signal-to-(Noise + Distortion) Ratio

5MHz Input Signal (2V Range)

5MHz Input Signal (3.2V Range)

25MHz Input Signal (2V Range)

25MHz Input Signal (3.2V Range)

70MHz Input Signal (2V Range)

70MHz Input Signal (3.2V Range)

THD

Total Harmonic Distortion

5MHz Input Signal, First 5 Harmonics (2V Range)

5MHz Input Signal, First 5 Harmonics (3.2V Range)

25MHz Input Signal, First 5 Harmonics (2V Range)

25MHz Input Signal, First 5 Harmonics (3.2V Range)

70MHz Input Signal, First 5 Harmonics (2V Range)

70MHz Input Signal, First 5 Harmonics (3.2V Range)

IMD

Intermodulation Distortion

Sample-and-Hold Bandwidth

f

IN1

= 2.52MHz, f

IN2

= 5.2MHz (2V Range)

f

IN1

= 2.52MHz, f

IN2

= 5.2MHz (3.2V Range)

R

SOURCE

= 50Ω

q

I TER AL REFERE CE CHARACTERISTICS

PARAMETER

V

CM

Output Voltage

V

CM

Output Tempco

V

CM

Line Regulation

V

CM

Output Resistance

CONDITIONS

I

OUT

= 0

I

OUT

= 0

4.75V

≤

V

DD

≤

5.25V

1mA

≤ I

OUT

 ≤

1mA

U

W U

U

MIN

75.5

TYP

73.5

77

72.5

75.5

70

71.5

MAX

UNITS

dBFS

dB

dBFS

dB

dBc

MHz

76

92

87

79

73

66

73

76

72.5

73.5

68

64

– 90

– 85

– 78

– 72

– 65

– 90

– 80

150

U

(Note 5)

MIN

2.42

TYP

2.5

±30

3

4

MAX

2.58

UNITS

V

ppm/°C

mV/V

Ω

1744f

3

LTC1744

DIGITAL I PUTS A D DIGITAL OUTPUTS

SYMBOL

V

IH

V

IL

I

IN

C

IN

V

OH

V

OL

I

OZ

C

OZ

I

SOURCE

I

SINK

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 D13 to D0

Hi-Z Output Capacitance D13 to D0

Output Source Current

Output Sink Current

CONDITIONS

V

DD

= 5.25V

V

DD

= 4.75V

V

IN

= 0V to V

DD

MSBINV and OE Only

OV

DD

= 4.75V

OV

DD

= 4.75V

V

OUT

= 0V to V

DD

, OE = High

OE = High (Note 8)

V

OUT

= 0V

V

OUT

= 5V

I

O

= –10µA

I

O

= – 200µA

I

O

= 160µA

I

O

= 1.6mA

q

The

q

indicates specifications which apply over the full

operating temperature range, otherwise specifications are at T

A

= 25°C. (Note 5)

MIN

2.4

0.8

±10

1.5

4.74

4

0.05

0.1

0.4

±10

15

– 50

50

TYP

MAX

UNITS

V

µA

pF

V

µA

pF

mA

POWER REQUIRE E TS

SYMBOL

V

DD

I

DD

P

DIS

OV

DD

PARAMETER

Positive Supply Voltage

Positive Supply Current

Power Dissipation

Digital Output Supply Voltage

The

q

indicates specifications which apply over the full operating temperature

range, otherwise specifications are at T

A

= 25°C. (Note 5)

CONDITIONS

q

0.5

MIN

4.75

245

1.2

TYP

MAX

5.25

300

1.5

V

DD

UNITS

V

mA

W

V

TI I G CHARACTERISTICS

SYMBOL

f

SAMPLE(MAX)

t

1

t

2

t

3

t

4

t

5

t

6

t

7

t

8

PARAMETER

Maximum Sampling Frequency

ENC Low Time

ENC High Time

Aperture Delay of Sample-and-Hold

ENC to Data Delay

ENC to CLKOUT Delay

CLKOUT to Data Delay

DATA Access Time After OE

↓

BUS Relinquish Time

Data Latency

The

q

indicates specifications which apply over the full operating temperature

range, otherwise specifications are at T

A

= 25°C. (Note 5)

CONDITIONS

q

Note 1:

Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 2:

All voltage values are with respect to ground with GND

(unless otherwise noted).

Note 3:

When these pin voltages are taken below GND or above V

DD

, they

will be clamped by internal diodes. This product can handle input currents

of greater than 100mA below GND or above V

DD

without latchup.

Note 4:

When these pin voltages are taken below GND, they will be

clamped by internal diodes. This product can handle input currents of

>100mA below GND without latchup. These pins are not clamped to V

DD

.

4

U W

U

UW

(Note 9)

C

L

= 10pF (Note 8)

C

L

= 10pF (Note 8)

C

L

= 10pF (Note 8)

C

L

= 10pF (Note 8)

(Note 8)

q

MIN

50

9.5

1.4

0.5

0

TYP

10

0

4.5

2.3

2.2

10

5

MAX

1000

8

5

25

UNITS

MHz

ns

cycles

Note 5:

V

DD

= 5V, f

SAMPLE

= 50MHz, differential ENC/ENC = 2V

P-P

50MHz

sine wave, input range =

±1.6V

differential, unless otherwise specified.

Note 6:

Integral nonlinearity is defined as the deviation of a code from a

straight line passing through the actual endpoints of the transfer curve.

The deviation is measured from the center of the quantization band.

Note 7:

Bipolar offset is the offset voltage measured from – 0.5 LSB

when the output code flickers between 00 0000 0000 0000 and 11

1111 1111 1111.

Note 8:

Guaranteed by design, not subject to test.

Note 9:

Recommended operating conditions.

1744f

LTC1744

TYPICAL PERFOR A CE CHARACTERISTICS

Typical INL, 3.2V Range

2.0

1.5

1.0

DNL ERROR (LSB)

INL ERROR (LSB)

T

A

= 25°C

AMPLITUDE (dBFS)

0.5

0

–0.5

–1.0

–1.5

–2.0

0

4000

8000

CODE

12000

16000

1744 G01

Nonaveraged, 8192 Point FFT,

Input Frequency = 20MHz, –1dB,

2V Range

0.5

–10.0

–20.0

–30.0

AMPLITUDE (dBFS)

T

A

= 25°C

AMPLITUDE (dBFS)

–40.0

–50.0

–60.0

–70.0

–80.0

–90.0

–40.0

–50.0

–60.0

–70.0

–80.0

–90.0

AMPLITUDE (dBFS)

–100.0

–110.0

–120.0

0 2 4 6 8 10 12 14 16 18 20 22 24

25.37

FREQUENCY (MHz)

1744 G04

Averaged, 8192 Point 2-Tone FFT,

Input Frequency = 2.5MHz and

5.2MHz, 2V Range

0.5

–10.0

–20.0

–30.0

AMPLITUDE (dBFS)

–40.0

–50.0

–60.0

–70.0

–80.0

–90.0

–40.0

–50.0

–60.0

–70.0

–80.0

–90.0

AMPLITUDE (dBFS)

–100.0

–110.0

–120.0

0 2 4 6 8 10 12 14 16 18 20 22 24

25.37

FREQUENCY (MHz)

1744 G07

U W

T

A

= 25°C

(Note 5)

Nonaveraged, 8192 Point FFT,

Input Frequency = 2.5MHz, –1dB,

2V Range

0.5

–10.0

–20.0

–30.0

–40.0

–50.0

–60.0

–70.0

–80.0

–90.0

T

A

= 25°C

Typical DNL, 3.2V Range

1.0

0.8

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0

0

4000

8000

CODE

12000

16000

1744 G02

T

A

= 25°C

–100.0

–110.0

–120.0

0 2 4 6 8 10 12 14 16 18 20 22 24

25.37

FREQUENCY (MHz)

1744 G03

Nonaveraged, 8192 Point FFT,

Input Frequency = 2.5MHz, –1dB,

3.2V Range

0.5

–10.0

–20.0

–30.0

T

A

= 25°C

0.5

–10.0

–20.0

–30.0

–40.0

–50.0

–60.0

–70.0

–80.0

–90.0

–100.0

–110.0

0 2 4 6 8 10 12 14 16 18 20 22 24

25.37

FREQUENCY (MHz)

1744 G05

Nonaveraged, 8192 Point FFT,

Input Frequency = 20MHz, –1dB,

3.2V Range

T

A

= 25°C

–100.0

–110.0

–120.0

0 2 4 6 8 10 12 14 16 18 20 22 24

25.37

FREQUENCY (MHz)

1744 G06

Averaged, 8192 Point 2-Tone FFT,

Input Frequency = 2.5MHz and

5.2MHz, 3.2V Range

0.5

–10.0

–20.0

–30.0

T

A

= 25°C

0.5

–10.0

–20.0

–30.0

–40.0

–50.0

–60.0

–70.0

–80.0

–90.0

–100.0

–110.0

0 2 4 6 8 10 12 14 16 18 20 22 24

25.37

FREQUENCY (MHz)

1744 G08

Averaged, 8192 Point FFT, Input

Frequency = 2.5MHz, – 6dB,

2V Range

T

A

= 25°C

–100.0

–110.0

–120.0

0 2 4 6 8 10 12 14 16 18 20 22 24

25.37

FREQUENCY (MHz)

1744 G10

1744f

5

参数名称	属性值
欧盟限制某些有害物质的使用	Compliant
ECCN (US)	3A991c.3.
Part Status	Active
HTS	8542.39.00.01
Converter Type	General Purpose
Process Technology	CMOS
Architecture	Pipelined
Resolution	14bit
Number of ADCs	1
Number of Input Channels	1
Sampling Rate	50Msps
Digital Interface Type	Parallel
Input Type	Voltage
Input Signal Type	Single-Ended\|Differential
Voltage Reference	Internal\|External
Polarity of Input Voltage	Bipolar
Voltage Supply Source	Single
Input Voltage	±1V/±1.6V
Minimum Single Supply Voltage (V)	4.75
Typical Single Supply Voltage (V)	5
Maximum Single Supply Voltage (V)	5.25
Maximum Supply Current	300
Typical Power Dissipation (mW)	1200
Maximum Power Dissipation (mW)	1500
Integral Nonlinearity Error	±4LSB
Full Scale Error	3%FSR
Signal to Noise Ratio	77dB(Typ)
No Missing Codes (bit)	14
Sample and Hold	Yes
Single-Ended Input	Yes
Digital Supply Support	No
Minimum Operating Temperature (°C)	0
Maximum Operating Temperature (°C)	70
系列 Packaging	Tube
Supplier Temperature Grade	Commercial
Pin Count	48
Standard Package Name	SOP
Supplier Package	TSSOP
Mounting	Surface Mount
Package Height	0.95(Max)
Package Length	12.6(Max)
Package Width	6.2(Max)
PCB changed	48
Lead Shape	Gull-wing

	LTC1744CFW#PBF	LTC1744CFW#TRPBF	LTC1744IFW#PBF	LTC1744IFW#TRPBF
描述	1-Channel Single ADC Pipelined 50Msps 14-bit Parallel 48-Pin TSSOP Tube	1-Channel Single ADC Pipelined 50Msps 14-bit Parallel 48-Pin TSSOP T/R	1-Channel Single ADC Pipelined 50Msps 14-bit Parallel 48-Pin TSSOP Tube	1-Channel Single ADC Pipelined 50Msps 14-bit Parallel 48-Pin TSSOP T/R
欧盟限制某些有害物质的使用	Compliant	Compliant	Compliant	Compliant
ECCN (US)	3A991c.3.	3A991.c.3	3A991.c.3	3A991.c.3
Part Status	Active	Active	Active	Active
HTS	8542.39.00.01	8542.39.00.01	8542.39.00.01	8542.39.00.01
Converter Type	General Purpose	General Purpose	General Purpose	General Purpose
Architecture	Pipelined	Pipelined	Pipelined	Pipelined
Resolution	14bit	14bit	14bit	14bit
Number of ADCs	1	1	1	1
Number of Input Channels	1	1	1	1
Sampling Rate	50Msps	50Msps	50Msps	50Msps
Digital Interface Type	Parallel	Parallel	Parallel	Parallel
Input Type	Voltage	Voltage	Voltage	Voltage
Input Signal Type	Single-Ended\|Differential	Differential\|Single-Ended	Single-Ended\|Differential	Differential\|Single-Ended
Voltage Reference	Internal\|External	External\|Internal	Internal\|External	External\|Internal
Polarity of Input Voltage	Bipolar	Bipolar	Bipolar	Bipolar
Voltage Supply Source	Single	Single	Single	Single
Input Voltage	±1V/±1.6V	±1V/±1.6V	±1V/±1.6V	±1V/±1.6V
Minimum Single Supply Voltage (V)	4.75	4.75	4.75	4.75
Typical Single Supply Voltage (V)	5	5	5	5
Maximum Single Supply Voltage (V)	5.25	5.25	5.25	5.25
Typical Power Dissipation (mW)	1200	1200	1200	1200
Maximum Power Dissipation (mW)	1500	1500	1500	1500
Integral Nonlinearity Error	±4LSB	±4LSB	±4LSB	±4LSB
Full Scale Error	3%FSR	3%FSR	3%FSR	3%FSR
Signal to Noise Ratio	77dB(Typ)	77dB(Typ)	77dB(Typ)	77dB(Typ)
No Missing Codes (bit)	14	14	14	14
Sample and Hold	Yes	Yes	Yes	Yes
Single-Ended Input	Yes	Yes	Yes	Yes
Digital Supply Support	No	No	No	No
Maximum Operating Temperature (°C)	70	70	85	85
系列 Packaging	Tube	Tape and Reel	Tube	Tape and Reel
Supplier Temperature Grade	Commercial	Commercial	Industrial	Industrial
Pin Count	48	48	48	48
Standard Package Name	SOP	SOP	SOP	SOP
Supplier Package	TSSOP	TSSOP	TSSOP	TSSOP
Mounting	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package Height	0.95(Max)	0.95(Max)	0.95(Max)	0.95(Max)
Package Length	12.6(Max)	12.6(Max)	12.6(Max)	12.6(Max)
Package Width	6.2(Max)	6.2(Max)	6.2(Max)	6.2(Max)
PCB changed	48	48	48	48
Lead Shape	Gull-wing	Gull-wing	Gull-wing	Gull-wing

LTC1744CFW#PBF

LTC1744CFW#PBF概述

LTC1744CFW#PBF规格参数

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