Linear Technology LTC1094ACN, LTC1093ACN, LTC1093, LTC1092CN8, LTC1092ACN8 Datasheet

LTC1091/LTC1092

LTC1093/LTC1094

1-, 2-, 6- and 8-Channel, 10-Bit Serial I/O Data Acquisition Systems

FEATURES

■Programmable Features

–Unipolar/Bipolar Conversions

–Differential/Single-Ended Multiplexer Configurations

■Sample-and-Holds

■Single Supply 5V, 10V or ±5V Operation

■Direct 3- or 4-Wire Interface to Most MPU Serial Ports and All MPU Parallel I/O Ports

■Analog Inputs Common Mode to Supply Rails

■Resolution: 10 Bits

■Total Unadjusted Error (A Grade): ±1LSB Over Temp

■Fast Conversion Time: 20 s

■Low Supply Current

LTC1091: 3.5mA Max, 1.5mA Typ LTC1092/LTC1093/LTC1094: 2.5mA Max, 1mA Typ

DESCRIPTIOU

The LTC®1091/LTC1092/LTC1093/LTC1094 10-bit data acquisition systems are designed to provide complete function, excellent accuracy and ease of use when digitizing analog data from a wide variety of signal sources and transducers. Built around a 10-bit, switched capacitor, successive approximation A/D core, these devices include software configurable analog multiplexers and bipolar and unipolar conversion modes as well as on-chip sample-

and-holds. On-chip serial ports allow efficient data transfer to a wide range of microprocessors and microcontrollers. These circuits can provide a complete data acquisition system in ratiometric applications or can be used with an external reference in others.

The high impedance analog inputs and the ability to operate with reduced spans (below 1V full scale) allow direct connection to sensors and transducers in many applications, eliminating the need for gain stages.

An efficient serial port communicates without external hardware to most MPU serial ports and all MPU parallel I/O ports allowing eight channels of data to be transmitted over as few as three wires. This, coupled with low power consumption, makes remote location possible and facilitates transmitting data through isolation barriers.

Temperature drift of offset, linearity and full-scale error are all extremely low (1ppm/°C typically) allowing all grades to be specified with offset and linearity errors of

±0.5LSB maximum over temperature. In addition, the A grade devices are specified with full-scale error and total

unadjusted error (including the effects of offset, linearity and full-scale errors) of ±1LSB maximum over temperature. The lower grade has a full-scale specification of

±2LSB for applications where full scale is adjustable or less critical.

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

TYPICAL APPLICATIOU

			5V	4.7 F
					MPU
	1	VCC	8		(e.g., 8051)
					P1.4
	CS	(VREF)
ANALOG INPUT #1	2		7
		CLK			P1.3
0V TO 5V RANGE	CH0
	3	LTC1091	6
ANALOG INPUT #2
		DOUT
	CH1				P1.2
0V TO 5V RANGE				SERIAL DATA LINK
	4	DIN	5		1091 TA01
	GND
					FOR 8051 CODE SEE
				APPLICATIONS INFORMATION
					SECTION

)
	REF
• V
1		1024
LINEARITY ERROR (LSB =

1.25

VCC = 5V

1.00

0.75

0.50

0.25

0

0

1

2

3

4

5

REFERENCE VOLTAGE (V)

1091 TA02

1

LTC1091/LTC1092

LTC1093/LTC1094

ABSOLUTE

WAXIWUW

RATIUGS (Notes 1, 2)

Supply Voltage (V	CC	) to GND or V – ........................					12V
Negative Supply Voltage (V –) ....................							– 6V to GND
Voltage
Analog Reference and LTC1091/2			CS
Inputs .................................		(V–) – 0.3V to (VCC + 0.3V)
Digital Inputs (except LTC1091/2							– 0.3V to 12V
				CS) ..
Digital Outputs ........................		– 0.3V to (VCC + 0.3V)

Power Dissipation .............................................	500mW
Operating Temperature Range	– 40°C to 85°C
LTC1091/2/3/4AC, LTC1091/2/3/4C.....
Storage Temperature Range ................	– 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................	300°C

PACKAGE/ORDER IUFORWATIOU

		TOP VIEW			ORDER PART		TOP VIEW			ORDER PART
	CS	1	8	VCC (VREF)	NUMBER	CS	1	8	VCC	NUMBER
	CH0	2	7	CLK	LTC1091ACN8	+IN	2	7	CLK	LTC1092ACN8
	CH1	3	6	DOUT
					LTC1091CN8	–IN	3	6	DOUT	LTC1092CN8
	GND	4	5	DIN		GND	4	5	VREF

N8 PACKAGE	N8 PACKAGE
8-LEAD PDIP	8-LEAD PDIP
TJMAX = 110°C, θJA = 150°C/W (N)	TJMAX = 110°C, θJA = 150°C/W (N)

			TOP VIEW		LTC1093ACN			TOP VIEW		LTC1094ACN
	CH0	1	16	VCC		CH0	1	20	DVCC
					LTC1093CN					LTC1094CN
	CH1	2	15	CLK		CH1	2	19	AVCC
					LTC1093CSW
	CH2	3	14	CS		CH2	3	18	CLK
	CH3	4	13	DOUT		CH3	4	17	CS
	CH4	5	12	DIN		CH4	5	16	DOUT
	CH5	6	11	VREF		CH5	6	15	DIN
	COM	7	10	AGND		CH6	7	14	REF+
	DGND	8	9	V –		CH7	8	13	REF–
						COM	9	12	AGND

N PACKAGE	SW PACKAGE	DGND						V–
16-LEAD PDIP	16-LEAD PLASTIC SO WIDE		10			11
TJMAX = 110°C, θJA = 150°C/W (N)					N PACKAGE
					20-LEAD PDIP
TJMAX = 110°C, θJA = 130°C/W (SW)		TJMAX = 110°C, θJA = 150°C/W (N)

Consult factory for Industrial and Military grade parts.

PRODUCT GUIDE

		CONVERSION MODES		REDUCED SPAN	±5V
				CAPABILITY
PART NUMBER	#CHANNELS	UNIPOLAR	BIPOLAR	(SEPARATE VREF)	CAPABILITY
LTC1091	2	●				Pin-for-Pin 10-Bit Upgrade of ADC0832
LTC1092	1	●		●		Pin-for-Pin 10-Bit Upgrade of ADC0831
LTC1093	6	●	●	●	●
LTC1094	8	●	●	●	●

2

LTC1091/LTC1092

LTC1093/LTC1094

RECOWWEUDED OPERATIUG COUDITIOUS

LTC1091A/LTC1092A/LTC1093A/LTC1094A

LTC1091/LTC1092/LTC1093/LTC1094

SYMBOL

PARAMETER

CONDITIONS

MIN

MAX

UNITS

VCC

Supply Voltage

4.5

10

V

V–

Negative Supply Voltage

LTC1093/LTC1094, VCC = 5V

– 5.5

0

V

fCLK

Clock Frequency

VCC = 5V

0.01

0.5

MHz

tCYC

Total Cycle Time

LTC1091

15 CLK Cycles

+ 2µs

LTC1092

12 CLK Cycles

+ 2µs

LTC1093/LTC1094

18 CLK Cycles

+ 2µs

thDI

Hold Time, DIN Alter SCLK↑

VCC = 5V

150

ns

Setup Time CS↓ Before CLK↑

VCC = 5V

1

µs

tsuCS

tsuDI

Setup Time DIN Stable Before CLK↑

VCC = 5V

400

ns

tWHCLK

CLK High Time

VCC = 5V

0.8

µs

tWLCLK

CLK Low Time

VCC = 5V

1

µs

High Time Between Data Transfer Cycles

VCC = 5V

2

µs

CS

tWHCS

LTC1091

15

CLK Cycles

CS

Low Time During Data Transfer

tWLCS

LTC1092

12

CLK Cycles

LTC1093/LTC1094

18

CLK Cycles

COUVERTER AUD WULTIPLEXER CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 3)

			LTC1091A/LTC1092A			LTC1091/LTC1092
			LTC1093A/LTC1094A			LTC1093/LTC1094
PARAMETER	CONDITIONS		MIN	TYP	MAX	MIN	TYP	MAX	UNITS
Offset Error	(Note 4)	●			±0.5			±0.5	LSB
Linearity Error	(Notes 4, 5)	●			±0.5			±0.5	LSB
Full-Scale Error	(Note 4)	●			±1.0			±2.0	LSB
Total Unadjusted Error	VREF = 5.000V (Notes 4, 6)	●			±1.0				LSB
Reference Input Resistance	LTC1092/LTC1093/LTC1094	●	5	10		5	10		kΩ
	VREF = 5V
Analog and REF Input Range	(Note 7)			(V –) – 0.05V to VCC + 0.05V					V
On-Channel Leakage Current	On-Channel = 5V	●			1			1	µA
(Note 8)	Off-Channel = 0V
	On-Channel = 0V	●			– 1			– 1	µA
	Off-Channel = 5V
Off-Channel Leakage Current	On-Channel = 5V	●			– 1			– 1	µA
(Note 8)	Off-Channel = 0V
	On-Channel = 0V	●			1			1	µA
	Off-Channel = 5V

3

LTC1091/LTC1092

LTC1093/LTC1094

AC CHARACTERISTICS

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 3)

				LTC1091A/LTC1092A/LTC1093A/LTC1094A
				LTC1091/LTC1092/LTC1093/LTC1094
SYMBOL	PARAMETER	CONDITIONS		MIN	TYP	MAX	UNITS
tSMPL	Analog Input Sample Time	See Operating Sequence			1.5		CLK Cycles
tCONV	Conversion Time	See Operating Sequence			10		CLK Cycles
tdDO	Delay Time, CLK↓ to DOUT Data Valid	See Test Circuits	●		400	850	ns
tdis	Delay Time, CS↑ to DOUT Hi-Z	See Test Circuits	●		180	450	ns
ten	Delay Time, CLK↓ to DOUT Enabled	See Test Circuits	●		160	450	ns
thDO	Time Output Data Remains Valid After SCLK↓				150		ns
tf	DOUT Fall Time	See Test Circuits	●		90	300	ns
tr	DOUT Rise Time	See Test Circuits	●		60	300	ns
CIN	Input Capacitance	Analog Inputs On-Channel			65		pF
		Analog Inputs Off-Channel			5		pF
		Digital Inputs			5		pF

U	D DC ELECTRICAL CHARACTERISTICS
DIGITAL A

The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. (Note 3)

LTC1091A/LTC1092A/LTC1093A/LTC1094A

LTC1091/LTC1092/LTC1093/LTC1094

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIH

High Level Input Voltage

VCC = 5.25V

●

2.0

V

VIL

Low Level Input Voltage

VCC = 4.75V

●

0.8

V

IIH

High Level Input Current

VIN = VCC

●

2.5

µA

IIL

Low Level Input Current

VIN = 0V

●

–2.5

µA

VOH

High Level Output Voltage

VCC = 4.75V, IOUT = 10µA

4.7

V

VCC = 4.75V, IOUT = 360µA

●

2.4

4.0

V

VOL

Low Level Output Voltage

VCC = 4.75V, IOUT = 1.6mA

●

0.4

V

IOZ

Hi-Z Output Leakage

VOUT = VCC,

High

3

µA

CS

●

VOUT = 0V,

CS

High

●

–3

µA

ISOURCE

Output Source Current

VOUT = 0V

–10

mA

ISINK

Output Sink Current

VOUT = VCC

10

mA

ICC

Positive Supply Current

LTC1091,

High

1.5

3.5

mA

CS

●

LTC1092/LTC1093/LTC1094,

CS

High, REF + Open

●

1.0

2.5

mA

IREF

Reference Current

LTC1092/LTC1093/LTC1094, VREF = 5V

●

0.5

1.0

mA

I –

Negative Supply Current

LTC1093/LTC1094,

High, V – = – 5V

1

50

µA

CS

●

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 DGND, AGND, GND and REF– wired together (unless otherwise noted). REF– is internally connected to the AGND pin on the LTC1093. DGND, AGND, REF– and V– are internally connected to the GND pin on the LTC1091/LTC1092.

Note 3: VCC = 5V, VREF + = 5V, VREF – = 0V, V – = 0V for unipolar mode and

– 5V for bipolar mode, CLK = 0.5MHz unless otherwise specified.

Note 4: These specs apply for both unipolar (LTC1091/LTC1092/LTC1093/ LTC1094) and bipolar (LTC1093/LTC1094 only) modes. In bipolar mode,

one LSB is equal to the bipolar input span (2VREF) divided by 1024. For example, when VREF = 5V, 1LSB (bipolar) = 2(5V)/1024 = 9.77mV.

Note 5: Linearity error is specified between the actual end points of the A/D transfer curve.

Note 6: Total unadjusted error includes offset, full scale, linearity, multiplexer and hold step errors.

Note 7: Two on-chip diodes are tied to each reference and analog input which will conduct for reference or analog input voltages one diode drop below V – or one diode drop above VCC. Be careful during testing at low VCC levels (4.5V), as high level reference or analog inputs (5V) can cause this input diode to conduct, especially at elevated temperatures, and cause errors for inputs near full scale. This spec allows 50mV forward bias of either diode. This means that as long as the reference or analog input does not exceed the supply voltage by more than 50mV, the output code will be correct. To achieve an absolute 0V to 5V input voltage range will therefore require a minimum supply voltage of 4.950V over initial tolerance, temperature variations and loading.

Note 8: Channel leakage current is measured after the channel selection.

4

LTC1091/LTC1092

LTC1093/LTC1094

TYPICAL PERFORWAUCE CHARACTERISTICS

Change in Offset Error vs

Temperature

	0.6
(LSB)	0.5		VCC (VREF) = 5V
			fCLK = 500kHz
CHANGE	0.4
OFFSETOF
	0.3
MAGNITUDE
	0.2
	0.1
	0

	–50			–25			0			25		50			75			100			125
						AMBIENT TEMPERATURE (°C)
																		1091/2/3/4 G01
		Digital Input Logic Threshold vs
		Supply Voltage
	4
			TA = 25°C
(V)	3
THRESHOLDLOGIC	2
	1
	0
				5			6					7			8			9			10
	4
							SUPPLY VOLTAGE (V)
																		1091/2/3/4 G04
	Maximum Clock Rate vs
	Temperature
	3.0
(MHz)				VCC = 5V
	2.5
FREQUENCY*
	1.5
CLK	2.0
	1.0
MAXIMUM
	0.5
	0
				–25			0			25		50			75			100			125
	–50

AMBIENT TEMPERATURE (°C)

1091/2/3/4 G07

Change in Linearity Error vs

Temperature

(LSB)	0.6
			fCLK = 500kHz
			VCC (VREF) = 5V
CHANGE	0.5
	0.4
LINEARITYOF
	0.3
MAGNITUDE	0.2
	0.1
	0

–50 –25 0 25 50 75 100 125 AMBIENT TEMPERATURE (°C)

1091/2/3/4 G02

DOUT Delay Time vs Temperature

	600
(ns)					VCC = 5V
	500
↓
						MSB-FIRST DATA
SCLK
	400
FROM
	300
TIME
						LSB-FIRST DATA
DELAY	200
OUT
	100
D
	0
						–25			0		25				50			75			100			125
	–50
								AMBIENT TEMPERATURE (°C)
																					1091/2/3/4 G05
		Maximum Clock Rate vs
		Supply Voltage
	3.0
(MHz)					TA = 25°C
	2.5
FREQUENCY*CLK
	2.0
	1.5
MAXIMUM	1.0
	0.5
	0
	4				5						6				7			8			9			10

SUPPLY VOLTAGE (V)

1091/2/3/4 G08

Change in Full-Scale Error vs

Temperature

(LSB)	0.6
					VCC (VREF) = 5V
CHANGE	0.5				fCLK = 500kHz
	0.4
-SCALE
	0.3
OF FULL
	0.2
MAGNITUDE
	0.1
	0
					–25			0							25			50			75			100			125
	–50
								AMBIENT TEMPERATURE (°C)
																								1091/2/3/4 G03
	DOUT Delay Time vs
	Supply Voltage
	600
(ns)					TA = 25°C
	500
SCLK↓	400
FROM
	300													MSB-FIRST DATA
TIME
DELAY	200
OUT	100								LSB-FIRST DATA
D
	0
	4				5			6										7			8			9			10
										SUPPLY VOLTAGE (V)
																								1091/2/3/4 G06
	Minimum Clock Rate vs
	Temperature
	0.3
(MHz)					VCC = 5V
	0.25
FREQUENCY**CLK
	0.20
	0.15
MINIMUM	0.10
	0.05
	0
					–25			0							25			50			75			100			125
	–50

AMBIENT TEMPERATURE (°C)

1091/2/3/4 G09

*MAXIMUM CLK FREQUENCY REPRESENTS THE HIGHEST FREQUENCY AT WHICH CLK CAN	**AS THE CLK FREQUENCY IS DECREASED FROM 500kHz, MINIMUM CLK FREQUENCY
BE OPERATED (WITH 50% DUTY CYCLE) WHILE STILL PROVIDING 100ns SETUP TIME FOR	( ERROR ≤ 0.1LSB) REPRESENTS THE FREQUENCY AT WHICH A 0.1LSB SHIFT IN ANY
THE DEVICE RECEIVING THE DOUT DATA.	CODE TRANSITION FROM ITS 500kHz VALUE IS FIRST DETECTED.

5

LTC1091/LTC1092

LTC1093/LTC1094

TYPICAL PERFORWAUCE CHARACTERISTICS

LTC1091/LTC1092/LTC1093/LTC1094	LTC1091/LTC1092/LTC1093/LTC1094	LTC1091/LTC1092/LTC1093/LTC1094
Maximum Clock Rate vs	Maximum Filter Resistor vs	Sample-and-Hold Acquisition Time
Source Resistance	Cycle Time	vs Source Resistance

1.25

VCC = 5V

100k

10

RFILTER

+

(µs)

VCC = 5V

(MHz)

TA = 25°C

VIN

TA = 25°C

1.00

Ω)

10k

CFILTER ≥1µF

0V TO 5V INPUT STEP

†

–

(

††

0.75

FILTER

1k

1

MAXIMUMFREQUENCYCLK

0.50

RSOURCE

MAXIMUMR

& HACQUISITION0.1%TIMETO

VIN

RSOURCE+

“+” OR “–”

100

+

0.25

INPUT

VIN

–

S

0

100

1k

10k

10

0.1

10

10

100

1000

10000

100

1k

10k

RSOURCE (Ω)

CYCLE TIME (µs)

RSOURCE+ (Ω )

1091/2/3/4 G10

1091/2/3/4 G11

1091/2/3/4 G12

INPUT CHANNEL LEAKAGE CURRENT (nA)

LTC1091/LTC1092 Input Channel Leakage Current vs Temperature

100 ON-CHANNEL OR

OFF-CHANNEL

80

60

40

20

0	–25	0	25	50	75	100	125
–50

AMBIENT TEMPERATURE (°C)

				LTC1091 Offset Error vs
				Supply Voltage
			1.25
)]					fCLK = 500kHz
	REF				TA = 25°C
(V			1.00		VOS = 0.85mV AT VCC (VREF) = 5V
	CC
• V
1		1024	0.75
[LSB =			0.5
ERROR
			0.25
OFFSET
			0
					5		6		7		8		9		10
			4

SUPPLY VOLTAGE (V)

)]
	REF
(V
	CC
• V
1		1024
LINEARITY ERROR [LSB =

LTC1091 Linearity Error vs

Supply Voltage

1.25

fCLK = 500kHz TA = 25°C

1.00

0.75

0.5

0.25

0

4

5

6

7

8

9

10

SUPPLY VOLTAGE (V)

1091/2/3/4 G13

1091/2/3/4 G14

1091/2/3/4 G15

LTC1091 Change in Full-Scale

Error vs Supply Voltage

				0.50
						fCLK = 500kHz
ERROR						TA = 25°C
	REF			0.25
SCALE-	)]
	V
	( V			0
	CC
FULL	•
	1		1024	–0.25
IN =
CHANGE	[LSB			–0.50
				–0.75
						5		6		7		8	9		10
				4

SUPPLY VOLTAGE (V)

1091/2/3/4 G16

SUPPLY CURRENT (mA)

LTC1091 Supply Current vs

Supply Voltage

7 fCLK = 500kHz

6CS = VCC (VREF) TA = 25°C

5

4

3

2

1

0

4

5

6

7

8

9

10

SUPPLY VOLTAGE (V)

1092/2/3/4 G17

SUPPLY CURRENT (mA)

LTC1091 Supply Current vs

Temperature

1.8
						fCLK = 500kHz
1.6						VCC (VREF) = 5V
						CS = 5V
1.4
1.2
1.0
0.8
0.6

–50 –25 0 25 50 75 100 125 AMBIENT TEMPERATURE (°C)

1091/2/3/4 G18

†AS THE CLK FREQUENCY AND SOURCE RESISTANCE ARE INCREASED, MAXIMUM CLK FREQUENCY ( ERROR ≤ 0.1LSB) REPRESENTS THE FREQUENCY AT WHICH A 0.1LSB SHIFT IN ANY CODE TRANSITION FROM ITS 500kHz, 0Ω VALUE IS FIRST DETECTED.

††MAXIMUM RFILTER REPRESENTS THE FILTER RESISTOR VALUE AT WHICH A 0.1LSB CHANGE IN FULL-SCALE ERROR FROM ITS VALUE AT RFILTER = 0 IS FIRST DETECTED.

6

LTC1091/LTC1092

LTC1093/LTC1094

TYPICAL PERFORWAUCE CHARACTERISTICS

				LTC1092/LTC1093/LTC1094																											LTC1092/LTC1093/LTC1094
				Unadjusted Offset Error vs																											Linearity Error vs
				Reference Voltage																											Reference Voltage
			10																												1.25
			9		V		CC	= 5V																					)				VCC =	5V
)																													REF
REF			8																										V		1.00
V																													•
•			7																										1	1024
1		1024
			6																										=		0.75
ERROROFFSET(LSB =																													ERRORLINEARITY(LSB
			5																												0.50
			4
											VOS = 1mV
			3
																															0.25
			2
			1
							VOS = 0.5mV																								0
			0
							0.2		1														5					10					1		2			3		4		5
			0.1																												0
									REFERENCE VOLTAGE (V)																										REFERENCE VOLTAGE (V)

1091/2/3/4 G19	1092/2/3/4 G20

)
	REF
• V
1		1024
CHANGE IN FULL-SCALE ERROR (LSB =

LTC1092/LTC1093/LTC1094 Change in Full-Scale Error vs Reference Voltage

1.25

VCC = 5V

1.00

0.75

0.50

0.25

0

0

1

2

3

4

5

REFERENCE VOLTAGE (V)

1092/2/3/4 G21

LTC1092/LTC1093/LTC1094 Noise Error vs Reference Voltage

	2.00
(LSB)	1.75		NOISE = 200 VP-P
	1.50
ERROR
	1.25
NOISE	1.00
-TO-PEAK	0.50
PEAK	0.75
	0.25
	0

0.1 0.2 1 5 10 REFERENCE VOLTAGE (V)

1091/2/3/4 G22

LTC1092/LTC1093/LTC1094

Change in Full-Scale Error vs

Supply Voltage

	0.50
(LSB)			VREF = 4V
			fCLK = 500kHz
ERROR	0.25
	0
-SCALE
IN FULL	– 0.25
CHANGE	–0.50
	–0.75
			5		6		7		8	9		10
	4

SUPPLY VOLTAGE (V)

1091/2/3/4 G25

		LTC1092/LTC1093/LTC1094
		Offset Error vs Supply Voltage
	1.25
					VREF = 4V
					fCLK = 500kHz
(LSB)	1.00				VOS = 1.25mV AT VCC = 5V
	0.75
ERROR
OFFSET	0.50
	0.25
	0
				5			6		7		8		9		10
	4
							SUPPLY VOLTAGE (V)
													1091/2/3/4 G23
		LTC1092/LTC1093/LTC1094
		Supply Current vs Supply Voltage
	6
					VREF OPEN
	5				fCLK = 500kHz
(mA)					CS = VCC
	4				TA = 25°C
CURRENT
	3
SUPPLY
	2
	1
	0
	4			5			6		7		8		9		10

SUPPLY VOLTAGE (V)

1091/2/3/4 G26

LTC1092/LTC1093/LTC1094 Linearity Error vs Supply Voltage

	1.25
			VREF = 4V
			fCLK = 500kHz
(LSB)	1.00
ERROR	0.75
LINEARITY	0.50
	0.25
	0

4 5 6 7 8 9 10 SUPPLY VOLTAGE (V)

1091/2/3/4 G24

LTC1092/LTC1093/LTC1094

Supply Current vs Temperature

	1.4
											VREF OPEN
	1.2										fCLK = 500kHz
											CS = 5V
(mA)											VCC = 5V
	1.0
CURRENT
	0.8
SUPPLY
	0.6
	0.4
	0.2
			–25		0		25		50		75		100		125
	–50

AMBIENT TEMPERATURE (°C)

1091/2/3/4 G27

7

LTC1091/LTC1092

LTC1093/LTC1094

TYPICAL PERFORWAUCE CHARACTERISTICS

REFERENCE CURRENT (mA)

LTC1092/LTC1093/LTC1094	LTC1093/LTC1094 Input Channel
Reference Current vs Temperature	Leakage Current vs Temperature

0.6

VREF = 5V

0.5

0.4

0.3

0.2

0.1

0	–25	0	25	50	75	100	125
–50

AMBIENT TEMPERATURE (°C)

	1000
(nA)	900					GUARANTEED
CURRENT	800
	700
	600
LEAKAGE
	500
	400
CHANNEL
	300
	200					ON-CHANNEL
INPUT					OFF-CHANNEL
	100
	0	–25	0		50	75	100	125
	–50			25
			AMBIENT TEMPERATURE (°C)

1091/2/3/4 G28

1091/2/3/4 G29

PIU FUUCTIOUS

LTC1091/LTC1092

CS (Pin 1): Chip Select Input. A logic low on this input enables the LTC1091/LTC1092.

CH0, CH1/+IN, – IN (Pins 2, 3): Analog Inputs. These inputs must be free of noise with respect to GND.

GND (Pin 4): Analog Ground. GND should be tied directly to an analog ground plane.

DIN (Pin 5)(LTC1091): Digital Data Input. The multiplexer address is shifted into this input.

VREF (Pin 5)(LTC1092): Reference Input. The reference input defines the span of the A/D converter and must be kept free of noise with respect to AGND.

DOUT (Pin 6): Digital Data Output. The A/D conversion result is shifted out of this output.

CLK (Pin 7): Shift Clock. This clock synchronizes the serial data transfer.

VCC(VREF)(Pin 8)(LTC1091): Positive Supply and Reference Voltage. This pin provides power and defines the span of the A/D converter. It must be kept free of noise and ripple by bypassing directly to the analog ground plane.

VCC (Pin 8 )(LTC1092): Positive Supply Voltage. This pin provides power to the A/D converter. It must be kept free of noise and ripple by bypassing directly to the analog ground plane.

LTC1093/LTC1094

CH0 to CH5/CH0 to CH7 (Pins 1 to 6/Pins 1 to 8): Analog Inputs. The analog inputs must be free of noise with respect to AGND.

COM (Pin 7/Pin 9): Common. The common pin defines the zero reference point for all single-ended inputs. It must be free of noise and is usually tied to the analog ground plane.

DGND (Pin 8/Pin 10): Digital Ground. This is the ground for the internal logic. Tie to the ground plane.

V – (Pin 9/Pin 11): Negative Supply. Tie V – to most negative potential in the circuit. (Ground in single supply applications.)

AGND (Pin 10/Pin 12): Analog Ground. AGND should be tied directly to the analog ground plane.

8

LTC1091/LTC1092

LTC1093/LTC1094

PIU FUUCTIOUS

VREF (Pin 11)(LTC1093): Reference Input. The reference input must be kept free of noise with respect to AGND.

REF +, REF – (Pins 13, 14 )(LTC1094): Reference Input. The reference input must be kept free of noise with respect to AGND.

DIN (Pin 12/Pin 15): Data Input. The A/D configuration word is shifted into this input.

DOUT (Pin 13/Pin 16): Digital Data Output. The A/D conversion result is shifted out of this output.

CS (Pin 14/Pin 17): Chip Select Input. A logic low on this input enables the LTC1093/LTC1094.

CLK (Pin 15/Pin 18): Shift Clock. This clock synchronizes the serial data transfer.

VCC (Pin 16)(LTC1093): Positive Supply. This supply must be kept free of noise and ripple by bypassing directly to the analog ground plane.

AVCC, DVCC (Pins 19, 20)(LTC1094): Positive Supply. This supply must be kept free of noise and ripple by bypassing directly to the analog ground plane. AVCC and DVCC should be tied together on the LTC1094.

BLOCK DIAGRAW

(Pin numbers refer to LTC1094)

DVCC

19

	AVCC	20			18	CLK
			INPUT	OUTPUT
	DIN	15	SHIFT		16	DOUT
				SHIFT
			REGISTER
				REGISTER
	CH0	1		SAMPLE-
	CH1	2
				AND-HOLD
	CH2	3		COMP
	CH3	4	ANALOG	10-BIT
	CH4	5		SAR
			INPUT MUX
	CH5	6		10-BIT
	CH6	7		CAPACITIVE
				DAC

CH7	8
COM	9

					CONTROL	17 CS
10	11	12	13	14	AND
					TIMING
DGND	V–	AGND	REF–	REF+
						1091/2/3/4 BD

9

LTC1091/LTC1092

LTC1093/LTC1094

TEST CIRCUITS

Onand Off-Channel Leakage Current

5V

ION
A	ON-CHANNEL

IOFF

A

OFF-

CHANNELS

POLARITY

1091/2/3/4 TC01

Voltage Waveforms for DOUT Delay Time, tdDO

CLK

0.8V

tdDO

2.4V

DOUT

0.4V

1091/2/3/4 TC03

Load Circuit for tdis, ten

TEST POINT

3k DOUT

100pF

5V tdis WAVEFORM 2, ten

tdis WAVEFORM 1

1091/2/3/4 TC05

Load Circuit for tdDO, tr, tf

DOUT

1.4V

3k

TEST POINT

100pF

1091/2/3/4 TC02

Voltage Waveforms for DOUT Rise and Fall Times, tr, tf

DOUT	2.4V
	0.4V
tr	tf
	1091/2/3/4 TC04

Voltage Waveforms for tdis

2.0V

CS

DOUT

90%

WAVEFORM 1

(SEE NOTE 1)

tdis

DOUT

WAVEFORM 2

10%

(SEE NOTE 2)

NOTE 1: WAVEFORM 1 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH THAT THE OUTPUT IS HIGH UNLESS DISABLED BY THE OUTPUT CONTROL

NOTE 2: WAVEFORM 2 IS FOR AN OUTPUT WITH INTERNAL CONDITIONS SUCH THAT THE OUTPUT IS LOW UNLESS DISABLED BY THE OUTPUT CONTROL

1091/2/3/4 TC06

LTC1091

Voltage Waveforms for ten

CS

DIN

START

CLK

1

2

3

4

DOUT

B9

0.4V

ten

1091/2/3/4 TC07

10