Linear Technology LTC1199LIS8, LTC1199LCMS8, LTC1199IS8, LTC1199IMS8, LTC1199CS8 Datasheet

FEATURES

■8-Pin MSOP and SO Packages

■10-Bit Resolution at 500ksps

■Single Supply: 5V or 3V

■Low Power at Full Speed: 25mW Typ at 5V 2.2mW Typ at 2.7V

■Auto Shutdown Reduces Power Linearly at Lower Sample Rates

■10-Bit Upgrade to 8-Bit LTC1196/LTC1198

■SPI and MICROWIRETM Compatible Serial I/O

■Low Cost

APPLICATIOUS

■High Speed Data Acquisition

■Portable or Compact Instrumentation

■Low Power or Battery-Operated Instrumentation

LTC1197/LTC1197L

LTC1199/LTC1199L

10-Bit, 500ksps ADCs in MSOP with Auto Shutdown

DESCRIPTIOU

The LTC®1197/LTC1197L/LTC1199/LTC1199L are 10-bit A/D converters with sampling rates up to 500kHz. They have 2.7V (L) and 5V versions and are offered in 8-pin MSOP and SO packages. Power dissipation is typically only 2.2mW at 2.7V (25mW at 5V) during full speed operation. The automatic power down reduces supply current linearly as sample rate is reduced. These 10-bit, switched-capacitor, successive approximation ADCs include a sample-and-hold. The LTC1197/LTC1197L have a differential analog input with an adjustable reference pin. The LTC1199/LTC1199L offer a software-selectable 2-channel MUX.

The 3-wire serial I/O, MSOP and SO-8 packages, 2.7V operation and extremely high sample rate-to-power ratio make these ADCs ideal choices for compact, low power high speed systems.

These circuits can be used in ratiometric applications or with external references. The high impedance analog inputs and the ability to operate with reduced spans below 1V full scale (LTC1197/LTC1197L) allow direct connection to signal sources in many applications, eliminating the need for gain stages.

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

MICROWIRE is a trademark of National Semiconductor Corporation.

TYPICAL APPLICATIOU

Single 2.7V Supply, 250ksps, 10-Bit Sampling ADC

1 F

2.7V

LTC1197L

1

8

CS

VCC

2

7

ANALOG INPUT

+IN

CLK

3

6

0V TO 2.7V RANGE

– IN

DOUT

4

5

GND

VREF

1197/99 TA01

SERIAL DATA LINK TO ASIC, PLD, MPU, DSP OR SHIFT REGISTERS

Supply Current vs Sampling Frequency

10000

A)	1000
						VCC = 5V
(				fCLK = 7.2MHz
CURRENT
	100
SUPPLY
	10						fCLK =	3.5MHz
							VCC = 2.7V
	1
	0.1
			0.1	1		10				100	1000
	0.01

SAMPLING FREQUENCY (kHz)

1197/99 G03

1

LTC1197/LTC1197L

LTC1199/LTC1199L

ABSOLUTE

WAXIWUW

RATIUGS (Notes 1, 2)

Supply Voltage (VCC) ...............................................	12V	Operating Temperature Range
Voltage		LTC1197C/LTC1197LC	0°C to 70°C
Analog Input .....................	GND – 0.3V to VCC + 0.3V	LTC1199C/LTC1199LC...........................
Digital Input ................................	GND – 0.3V to 12V	LTC1197I/LTC1197LI	– 45°C to 85°C
Digital Output ....................	GND – 0.3V to VCC + 0.3V	LTC1199I/LTC1199LI ........................
Power Dissipation ..............................................	500mW	Lead Temperature (Soldering, 10 sec).................	300°C
Storage Temperature Range .................	– 65°C to 150°C

PACKAGE/ORDER IUFORWATIOU

ORDER PART

ORDER PART

NUMBER

TOP VIEW

NUMBER

TOP VIEW

LTC1197CMS8

LTC1197CS8

CS

1

8

VCC

CS

1

8 VCC

LTC1197IMS8

+IN

2

7

CLK

LTC1197IS8

+IN

2

7 CLK

–IN

3

6 DOUT

LTC1197LCMS8

– IN

3

6

DOUT

LTC1197LCS8

GND

4

5 VREF

LTC1197LIMS8

GND

4

5

VREF

LTC1197LIS8

MS8 PACKAGE

8-LEAD PLASTIC MSOP

S8 PACKAGE

MS8 PART MARKING

S8 PART MARKING

TJMAX = 150°C, θJA = 210°C/W

8-LEAD PLASTIC SO

LTKV

LTBL

TJMAX = 150°C, θJA = 175°C/W

1197

1197L

LTKW

LTJA

1197I

1197LI

ORDER PART

ORDER PART

TOP VIEW

NUMBER

TOP VIEW

NUMBER

LTC1199CMS8

LTC1199CS8

8 VCC

CS

1

8

VCC

CS

1

CH0

2

7 CLK

LTC1199IMS8

CH0

2

7

CLK

LTC1199IS8

CH1

3

6 DOUT

LTC1199LCMS8

LTC1199LCS8

CH1

3

6

DOUT

GND

4

5 DIN

LTC1199LIMS8

LTC1199LIS8

MS8 PACKAGE

GND

4

5

DIN

8-LEAD PLASTIC MSOP

S8 PACKAGE

MS8 PART MARKING

S8 PART MARKING

TJMAX = 150°C, θJA = 210°C/W

8-LEAD PLASTIC SO

LTFL

LTCM

TJMAX = 150°C, θJA = 175°C/W

1199

1199L

LTWB

LTWC

1199I

1199LI

Consult factory for parts specified with wider operating temperature ranges.

RECOWWEUDED OPERATIUG COUDITIOUS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

LTC1197

LTC1199

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

VCC

Supply Voltage

4

9

4

6

V

VCC = 5V

Operation

fCLK

Clock Frequency

●

0.05

7.2

0.05

7.2

MHz

tCYC

Total Cycle Time

14

16

CLK

tSMPL

Analog Input Sampling Time

1.5

1.5

CLK

thCS

Hold Time

Low After Last CLK↑

13

13

ns

CS

2

LTC1197/LTC1197L

LTC1199/LTC1199L

RECOWWEUDED OPERATIUG COUDITIOUS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

LTC1197

LTC1199

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

VCC = 5V

Operation

tsuCS

Setup Time

CS

↓ Before First CLK↑

26

26

ns

(See Figures 1, 2)

thDI

Hold Time DIN After CLK↑

LTC1199

26

ns

tsuDI

Setup Time DIN Stable Before CLK↑

LTC1199

26

ns

tWHCLK

CLK High Time

fCLK = fCLK(MAX)

40%

40%

1/fCLK

tWLCLK

CLK Low Time

fCLK = fCLK(MAX)

40%

40%

1/fCLK

tWHCS

CS

High Time Between Data Transfer Cycles

32

32

ns

Low Time During Data Transfer

13

15

CLK

tWLCS

CS

LTC1197L

LTC1199L

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

VCC

Supply Voltage

2.7

4

2.7

4

V

VCC = 2.7V Operation

fCLK

Clock Frequency

●

0.01

3.5

0.01

3.5

MHz

tCYC

Total Cycle Time

14

16

CLK

tSMPL

Analog Input Sampling Time

1.5

1.5

CLK

thCS

Hold Time

Low After Last CLK↑

40

40

ns

CS

tsuCS

Setup Time

↓ Before First CLK↑

78

78

ns

CS

(See Figures 1, 2)

thDI

Hold Time DIN After CLK↑

LTC1199L

78

ns

tsuDI

Setup Time DIN Stable Before CLK↑

LTC1199L

78

ns

tWHCLK

CLK High Time

fCLK = fCLK(MAX)

40%

40%

1/fCLK

tWLCLK

CLK Low Time

fCLK = fCLK(MAX)

40%

40%

1/fCLK

High Time Between Data Transfer Cycles

96

96

ns

tWHCS

CS

Low Time During Data Transfer

13

15

CLK

tWLCS

CS

COUVERTER AUD WULTIPLEXER CHARACTERISTICS

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VCC = 5V, VREF = 5V, fCLK = fCLK(MAX) as defined in Recommended Operating Conditions, unless otherwise noted.

				LTC1197			LTC1199
PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
Offset Error		●			±2			±2	LSB
Linearity Error	(Note 3)	●			±1			±1	LSB
Gain Error		●			±4			±4	LSB
No Missing Codes Resolution		●	10			10			Bits
Analog Input Range					– 0.05V to VCC + 0.05V				V
Reference Input Range	LTC1197, VCC ≤ 6V		0.2		VCC + 0.05V				V
	LTC1197, VCC > 6V		0.2		6				V
Analog Input Leakage Current	(Note 4)	●			±1			±1	µA

3

LTC1197/LTC1197L

LTC1199/LTC1199L

COUVERTER AUD WULTIPLEXER CHARACTERISTICS

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VCC = 2.7V, VREF = 2.5V (LTC1197L), fCLK = fCLK(MAX) as defined in Recommended Operating Conditions, unless otherwise noted.

				LTC1197L			LTC1199L
PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
Offset Error		●			±2			±2	LSB
Linearity Error	(Note 3)	●			±1			±1	LSB
Gain Error		●			±4			±4	LSB
No Missing Codes Resolution		●	10			10			Bits
Analog Input Range					– 0.05V to VCC + 0.05V				V
Reference Input Range	LTC1197L		0.2		VCC + 0.05V				V
Analog Input Leakage Current	(Note 4)	●			±1			±1	A

DYUAWIC ACCURACY

VCC = 5V, VREF = 5V, fCLK = fCLK(MAX) as defined in Recommended Operating Conditions, unless otherwise noted.

				LTC1197			LTC1199
SYMBOL	PARAMETER	CONDITIONS	MIN	TYP	MAX	MIN	TYP	MAX	UNITS
S/(N + D)	Signal-to-Noise Plus	100kHz Input Signal		60			60		dB
	Distortion Ratio
THD	Total Harmonic Distortion	100kHz Input Signal		– 64			– 64		dB
	First 5 Harmonics
	Peak Harmonic or Spurious Noise	100kHz Input Signal		– 68			– 68		dB
IMD	Intermodulation Distortion	fIN1 = 97.046kHz, fIN2 = 102.905kHz
		2nd Order Terms		– 65			– 65		dB
		3rd Order Terms		– 70			– 70		dB

VCC = 2.7V, VREF = 2.5V, fCLK = fCLK(MAX) as defined in Recommended Operating Conditions, unless otherwise noted.

				LTC1197L			LTC1199L
SYMBOL	PARAMETER	CONDITIONS	MIN	TYP	MAX	MIN	TYP	MAX	UNITS
S/(N + D)	Signal-to-Noise Plus	50kHz Input Signal		58			58		dB
	Distortion Ratio
THD	Total Harmonic Distortion	50kHz Input Signal		– 60			– 60		dB
	First 5 Harmonics
	Peak Harmonic or Spurious Noise	50kHz Input Signal		– 63			– 63		dB
IMD	Intermodulation Distortion	fIN1 = 48.5kHz, fIN2 = 51.5kHz
		2nd Order Terms		– 60			– 60		dB
		3rd Order Terms		– 65			– 65		dB

4

LTC1197/LTC1197L

LTC1199/LTC1199L

DIGITAL AND DC ELECTRICAL CHARACTERISTICS	The ● denotes the specifications which apply
U

over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, VREF = 5V, unless otherwise noted.

LTC1197

LTC1199

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

VIH

High Level Input Voltage

VCC = 5.25V

●

2.4

2.4

V

VIL

Low Level Input Voltage

VCC = 4.75V

●

0.8

0.8

V

IIH

High Level Input Current

VIN = VCC

●

2.5

2.5

A

IIL

Low Level Input Current

VIN = 0V

●

– 2.5

– 2.5

A

VOH

High Level Output Voltage

VCC = 4.75V, IO = 10 A

●

4.5

4.74

4.5

4.74

V

VCC = 4.75V, IO = 360 A

●

2.4

4.72

2.4

4.72

V

VOL

Low Level Output Voltage

VCC = 4.75V, IO = 1.6mA

●

0.4

0.4

V

IOZ

Hi-Z Output Leakage

= High

±3

±3

A

CS

●

ISOURCE

Output Source Current

VOUT = 0V

– 25

– 25

mA

ISINK

Output Sink Current

VOUT = VCC

45

45

mA

IREF

Reference Current (LTC1197)

= VCC

0.001

3

A

CS

●

fSMPL = fSMPL(MAX)

●

0.5

1

mA

ICC

Supply Current

0.001

3

0.001

3

A

CS

= VCC

●

fSMPL = fSMPL(MAX)

●

4.5

8

5

8.5

mA

PD

Power Dissipation

fSMPL = fSMPL(MAX)

22.5

25

mW

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VCC = 2.7V, VREF = 2.5V, unless otherwise noted.

LTC1197L

LTC1199L

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

VIH

High Level Input Voltage

VCC = 3.6V

●

1.9

1.9

V

VIL

Low Level Input Voltage

VCC = 2.7V

●

0.45

0.45

V

IIH

High Level Input Current

VIN = VCC

●

2.5

2.5

A

IIL

Low Level Input Current

VIN = 0V

●

– 2.5

– 2.5

A

VOH

High Level Output Voltage

VCC = 2.7V, IO = 10 A

●

2.3

2.60

2.3

2.60

V

VCC = 2.7V, IO = 360 A

●

2.1

2.45

2.1

2.45

V

VOL

Low Level Output Voltage

VCC = 2.7V, IO = 400 A

●

0.3

0.3

V

IOZ

Hi-Z Output Leakage

= High

±3

±3

A

CS

●

ISOURCE

Output Source Current

VOUT = 0V

– 6.5

– 6.5

mA

ISINK

Output Sink Current

VOUT = VCC

11

11

mA

IREF

Reference Current (LTC1197L)

= VCC

0.001

3.0

A

CS

●

fSMPL = fSMPL(MAX)

●

0.250

0.5

mA

ICC

Supply Current

= VCC

0.001

3

0.001

3

A

CS

●

fSMPL = fSMPL(MAX)

●

0.8

2

0.8

2

mA

PD

Power Dissipation

fSMPL = fSMPL(MAX)

2.2

2.2

mW

5

LTC1197/LTC1197L

LTC1199/LTC1199L

AC CHARACTERISTICS

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VCC = 5V, VREF = 5V, fCLK = fCLK(MAX) as defined in Recommended Operating Conditions, unless otherwise noted.

LTC1197

LTC1199

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

tCONV

Conversion Time (See Figures 1, 2)

●

1.4

1.4

µs

fSMPL(MAX)

Maximum Sampling Frequency

●

500

450

kHz

tdDO

Delay Time, CLK↑ to DOUT Data Valid

CLOAD = 20pF

68

78

68

78

ns

●

100

100

ns

tdis

Delay Time,

↑ to DOUT Hi-Z

75

150

75

150

ns

CS

●

ten

Delay Time, CLK↓ to DOUT Enabled

CLOAD = 20pF

●

40

68

40

68

ns

thDO

Time Output Data Remains

CLOAD = 20pF

●

15

55

15

55

ns

Valid After CLK↑

tr

DOUT Rise Time

CLOAD = 20pF

●

10

20

10

20

ns

tf

DOUT Fall Time

CLOAD = 20pF

●

10

20

10

20

ns

CIN

Input Capacitance

Analog Input On Channel

20

20

pF

Analog Input Off Channel

5

5

pF

Digital Input

5

5

pF

The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VCC = 2.7V, VREF = 2.5V, fCLK = fCLK(MAX) as defined in Recommended Operating Conditions, unless otherwise noted.

LTC1197L

LTC1199L

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

UNITS

tCONV

Conversion Time (See Figures 1, 2)

●

2.9

2.9

µs

fSMPL(MAX)

Maximum Sampling Frequency

●

250

210

kHz

tdDO

Delay Time, CLK↑ to DOUT Data Valid

CLOAD = 20pF

130

180

130

180

ns

●

250

250

ns

tdis

Delay Time,

↑ to DOUT Hi-Z

120

250

120

250

ns

CS

●

ten

Delay Time, CLK↓ to DOUT Enabled

CLOAD = 20pF

●

100

200

100

200

ns

thDO

Time Output Data Remains

CLOAD = 20pF

●

30

120

30

120

ns

Valid After CLK↑

tr

DOUT Rise Time

CLOAD = 20pF

●

15

40

15

40

ns

tf

DOUT Fall Time

CLOAD = 20pF

●

15

40

15

40

ns

CIN

Input Capacitance

Analog Input On Channel

20

20

pF

Analog Input Off Channel

5

5

pF

Digital Input

5

5

pF

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 GND.

Note 3: Integral nonlinearity is defined as 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 4: Channel leakage current is measured after the channel selection.

6

LTC1197/LTC1197L

LTC1199/LTC1199L

TYPICAL PERFORWAUCE CHARACTERISTICS

SUPPLY CURRENT (mA)

	Supply Current vs Clock Rate*
20
18
16												VCC = 9V														(mA)
14
12																										CURRENT
10																										SUPPLY
8
6
4												VCC = 5V
2
										VCC = 2.7V
0
							100			1000													10000
10

FREQUENCY (kHz)

1197/99 G01

Supply Current vs Supply Voltage

16										80
		fCLK = 3.5MHz
14		TA = 25°C								70

12
10								ACTIVE
								MODE
8
6
4
2								SHUTDOWN
								MODE
0

0	1	2	3	4	5	6	7
			SUPPLY VOLTAGE (V)

	60	SHUTDOWN
	50	CURRENT
	40
	30	(nA)
	20

10

0

8 9

1197/99 G02

		Supply Current
		vs Sampling Frequency
10000
A)	1000
							VCC = 5V
(					fCLK = 7.2MHz
CURRENT
	100
SUPPLY
	10							fCLK =	3.5MHz
								VCC = 2.7V
	1
	0.1
			0.1		1		10				100		1000
	0.01

SAMPLING FREQUENCY (kHz)

1197/99 G03

	INL Plot												DNL Plot
	1.0												1.0
			VCC = VREF = 5V												VCC = VREF = 5V
			fCLK = 7.2MHz												fCLK = 7.2MHz
	0.5		TA = 25°C										0.5		TA = 25°C
(LSBs)												(LSBs)
	0												0
INL												DNL
	– 0.5												– 0.5
	–1.0												–1.0
	0		128	256	384	512	640	768	896	1024			0		128	256	384	512	640	768	896	1024
						CODE												CODE
									1197/99 G04												1197/99 G26

	LTC1197 4096 Point FFT
	0
	–10				fSMPL = 500kHz
					fIN = 97.045898kHz
	– 20
(dB)	– 30
	– 40
AMPLITUDE
	– 50
	– 60
	– 70
	– 80
	– 90
	–100
			50	100	150	200	250
	0

FREQUENCY (kHz)

1197/99 G06

ENOBs vs Frequency

THD vs Frequency

10

0

9

– 10

TA =

25°C

8

VCC = 2.7V

fSMPL = 250kHz

– 20

7

VCC = 5V

ENOBs

6

fSMPL = 500kHz

THD(dB)

– 30

– 40

VCC =

2.7V

5

4

– 50

fSMPL = 250kHz

3

– 60

2

– 70

VCC = 5V

1

fSMPL = 500kHz

– 80

0

1	10	100	1000	10	100	1000
	FREQUENCY (kHz)				FREQUENCY (kHz)
			1197/99 G07			1197/99 G08

*Part is continuously sampling, spending only a minimum amount of time in shutdown.

	Intermodulation Distortion Plot
	0
	–10				fSMPL = 500kHz
					fIN1 = 97.045898kHz
	– 20				fIN2 = 102.905273kHz
(dB)	– 30
	– 40
AMPLITUDE
	– 50
	– 60
	– 70
	– 80
	– 90
	–100
			50
	0			100	150	200	250

FREQUENCY (kHz)

1197/99 G09

7

LTC1197/LTC1197L

LTC1199/LTC1199L

TYPICAL PERFORWAUCE CHARACTERISTICS

		LTC1197L Change in Linearity
		vs Supply Voltage
	1.0
	0.8		VREF = 2.5V
(LSBs)			fCLK = 3.5MHz
	0.6
LINEARITYIN	0.4
	– 0.2
	0.2
CHANGE	0
	– 0.6
	– 0.4
	– 0.8
	– 1.0
				1									3							4
	0									2														5
							SUPPLY VOLTAGE (V)
																					1197/99 G10
	LTC1197 Change in Linearity
	vs Supply Voltage
	1.0
	0.8		VREF = 4V
			fCLK = 7MHz
(LSBs)	0.6		TA = 25°C
	0.4
LINEARITYIN	– 0.2
	0.2
CHANGE	0
	– 0.6
	– 0.4
	– 0.8
	– 1.0
			1	2			3						5					7		8				9
	0									4						6
							SUPPLY VOLTAGE (V)
																					1197/99 G13
	LTC1197 Linearity Error
	vs Reference Voltage
	2.0
																	VCC = 5V
																	fCLK = 7.2MHz
(LSBs)ERROR	1.0																TA = 25°C
LINEARITY	1.5
	0.5
	0
				1						2			3							4				5
	0

REFERENCE VOLTAGE (V)

LTC1197L Change in Offset vs Supply Voltage

	2.0
			VREF = 2.5V
(LSBs)	1.5		fCLK = 3.5MHz
	1.0
OFFSET	0.5
	0
IN
CHANGE	– 0.5
	–1.0
	–1.5
	– 2.0
			1		2		3		4		5
	0

SUPPLY VOLTAGE (V)

1197/99 G11

LTC1197 Change in Offset

vs Supply Voltage

2.0

VREF = 4V

1.5

fCLK = 7MHz

(LSBs)

1.0

TA = 25°C

0.5

OFFSET

0

IN

– 0.5

CHANGE

–1.0

–1.5

– 2.0

0	1	2	3	4	5	6	7	8	9
			SUPPLY VOLTAGE (V)
								1197/99 G14

	LTC1197 Offset Error
	vs Reference Voltage
	2.5
									VCC = 5V
									fCLK = 7.2MHz
(LSBs)	2.0								TA = 25°C
	1.5
ERROR
OFFSET	1.0
	0.5
	0
			1		2		3		4			5
	0

REFERENCE VOLTAGE (V)

1197/99 F16

1197/99 G17

	LTC1197L Change in Gain Error
	vs Supply Voltage
	1.0
	0.8		VREF = 2.5V
(LSBs)			fCLK = 3.5MHz
	0.6
	0.4
ERROR
	0.2
GAIN	0
	– 0.2
IN
CHANGE	– 0.4
	– 0.6
	– 0.8
	– 1.0
			1		2		3		4	5
	0
				SUPPLY VOLTAGE (V)
										1197/99 G12

LTC1197 Change in Gain Error

vs Supply Voltage

2.0

VREF = 4V

(LSBs)

1.5

fCLK = 7MHz

1.0

TA = 25°C

ERROR

0.5

IN GAIN

0

– 0.5

CHANGE

–1.0

–1.5

– 2.0

0 1 2 3 4 5 6 7 8 9 SUPPLY VOLTAGE (V)

1197/99 G15

LTC1197 Gain Error vs Reference Voltage

	2.0
									VCC = 5V
									fCLK = 7.2MHz
	1.5								TA = 25°C
(LSBs)
ERRORGAIN	1.0
	0.5
	0
			1		2		3		4			5
	0

REFERENCE VOLTAGE (V)

1197/99 F18

8

LTC1197/LTC1197L

LTC1199/LTC1199L

TYPICAL PERFORWAUCE CHARACTERISTICS

LINEARITY ERROR (LSBs)

Linearity vs Temperature

Offset vs Temperature

Gain Error vs Temperature

0.5

0

0

VCC = 5V

– 0.1

V

CC

= 5V

VCC = 5V

VREF = 5V

VREF = 5V

VREF = 5V

– 0.2

0.4

fCLK = 7.2MHz

(LSBs)VOLTAGE

– 0.2

fCLK = 7.2MHz

(LSBs)ERROR

– 0.8

fCLK = 7.2MHz

0.3

– 0.3

– 0.4

– 0.4

– 0.6

– 0.5

0.2

OFFSET

– 0.6

GAIN

– 0.7

– 1.0

0.1

– 0.8

– 1.2

– 0.9

0

– 1.4

– 1.0

–55 – 30 – 5 20 45 70 95 120	–55 – 30 – 5 20 45 70 95 120	–55 – 30 – 5 20 45 70 95 120
TEMPERATURE (°C)	TEMPERATURE (°C)	TEMPERATURE (°C)
1197/99 G19	1197/99 G20	1197/99 G21

Minimum Clock Frequency for 0.1LSB Error* vs Temperature

1000

V

REF = 5V

(kHz)

V

CC = 5V

100

FREQUENCY

10

CLOCK

MINIMUM

1

0.1

5 25 45 65 85

105 125

– 55 – 35 – 15

TEMPERATURE (°C)

1197/99 G22

Acquisition Time

vs Source Resistance

100

VCC = VREF = 5V

TA = 25°C

( s)

10

TIME

VIN

+

+ INPUT

ACQUISITION

RSOURCE

1

COM

0.1

1000

10000

100

SOURCE RESISTANCE (Ω)

1197/99 G25

LOGIC THRESHOLD (V)

MAXIMUM CLOCK FREQUENCY (MHz)

Digital Input Threshold vs Supply Voltage

5

TA = 25°C

4

3

2

1

0

0

2

4

6

8

10

SUPPLY VOLTAGE (V)

1197/99 G23

Maximum Clock Frequency vs Supply Voltage

11

10VREF = 2.5V TA = 25°C

9

8

7

6

5

4

3

2

1

0

0

1

2

3

4

5

6

7

8

9

10

SUPPLY VOLTAGE (V)

1197/99 G26

	Input Channel Leakage Current
	vs Temperature
	100
					VREF = 5V
					VCC = 5V
(nA)	10
														ON CHANNEL
CURRENT	1																		OFF CHANNEL
LEAKAGE
	0.1
	0.01
	0.001
								25						50			75		100			125
	0
													TEMPERATURE (°C)
																						1197/99 G24
		Maximum Clock Frequency†
		vs Source Resistance
10000
(kHz)FREQUENCY																		VREF = VCC = 5V
																		TA = 25°C
CLOCK	1000
MAXIMUM					VIN					R
												SOURCE
												+ INPUT
												– INPUT
													–
	100
														1000								10000
	100
												SOURCE RESISTANCE (Ω)
																					1197/99 G27

*As the CLK frequency is decreased from 2MHz, minimum CLK frequency ( error ≤ 0.1LSB) represents the frequency at which a 0.1LSB shift in any code translation from its 2MHz value is first detected.

†Maximum CLK frequency represents the clock frequency at which a 0.1LSB shift in the error at any code transition from its 3.5MHz value is first detected.

9