LINEAR TECHNOLOGY LTC1863, LTC1867 Technical data

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FEATURES

■

Sample Rate: 200ksps

■

16-Bit No Missing Codes and ±2LSB Max INL

■

8-Channel Multiplexer with:

Single Ended or Differential Inputs and
Unipolar or Bipolar Conversion Modes

■

SPI/MICROWIRETM Serial I/O

■

Signal-to-Noise Ratio: 89dB

■

Single 5V Operation

■

On-Chip or External Reference

■

Low Power: 1.3mA at 200ksps, 0.76mA at 100ksps

■

Sleep Mode

■

Automatic Nap Mode Between Conversions

■

16-Pin Narrow SSOP Package

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APPLICATIO S

■

Industrial Process Control

■

High Speed Data Acquisition

■

Battery Operated Systems

■

Multiplexed Data Acquisition Systems

■

Imaging Systems

LTC1863/LTC1867

12-/16-Bit, 8-Channel

200ksps ADCs

U

DESCRIPTIO

The LTC®1863/LTC1867 are pin-compatible, 8-channel
12-/16-bit A/D converters with serial I/O, and an internal
reference. The ADCs typically draw only 1.3mA from a
single 5V supply.

The 8-channel input multiplexer can be configured for
either single-ended or differential inputs and unipolar
or bipolar conversions (or combinations thereof). The
automatic nap and sleep modes benefit power sensitive
applications.

The LTC1867’s DC performance is outstanding with a
±2LSB INL specification and no missing codes over tem­perature. The signal-to-noise ratio (SNR) for the LTC1867
is typically 89dB, with the internal reference.

Housed in a compact, narrow 16-pin SSOP package, the
LTC1863/LTC1867 can be used in space-sensitive as well
as low-power applications.

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

MICROWIRE is a trademark of National Semiconductor Corp.

BLOCK DIAGRA

1

CH0

2

CH1

3

CH2
CH3
CH4
CH5
CH6

CH7/COM

4

ANALOG

5

INPUT

6

MUX
7
8

12-/16-BIT

+

200ksps

–

ADC

INTERNAL

2.5V REF

W

LTC1863/LTC1867

SERIAL

PORT

18637 BD

16
15
14
13
12
11
10

9

V

DD

GND
SDI
SDO
SCK
CS/CONV
V

REF

REFCOMP

Integral Nonlinearity vs Output Code

(LTC1867)

2.0

1.5

1.0

0.5

0

INL (LBS)

– 0.5

– 1.0

– 1.5

– 2.0

0

16384 32768 65536

OUTPUT CODE

49152

18637 GO1

18637f

1

LTC1863/LTC1867

WW

W

ABSOLUTE AXI U RATI GS

(Notes 1, 2)

Supply Voltage (VDD)................................... –0.3V to 6V

Analog Input Voltage

CH0-CH7/COM (Note 3) ..........–0.3V to (VDD + 0.3V)

V

, REFCOMP (Note 4).........–0.3V to (VDD + 0.3V)

REF

Digital Input Voltage (SDI, SCK, CS/CONV)

(Note 4) .................................................– 0.3V to 10V

Digital Output Voltage (SDO) .......–0.3V to (VDD + 0.3V)

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

Operating Temperature Range

LTC1863C/LTC1867C/LTC1867AC .......... 0°C to 70°C

LTC1863I/LTC1867I/LTC1867AI ........ –40°C to 85°C

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PACKAGE/ORDER I FOR ATIO

TOP VIEW

CH0

1
2

CH1

3

CH2

4

CH3

5

CH4

6

CH5

7

CH6

CH7/COM

8

GN PACKAGE

16-LEAD NARROW PLASTIC SSOP

T

= 110°C, θJA = 95°C/W

JMAX

16
15
14
13
12
11
10

9

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

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

Consult LTC Marketing for parts specified with wider operating temperature ranges.

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CO VERTER CHARACTERISTICS

temperature range, otherwise specifications are at TA = 25°C. With external reference (Notes 5, 6)

The ● denotes the specifications which apply over the full operating

V

DD

GND
SDI
SDO
SCK
CS/CONV
V

REF

REFCOMP

UUW

ORDER PART

NUMBER

LTC1863CGN
LTC1863IGN
LTC1867CGN
LTC1867IGN
LTC1867ACGN
LTC1867AIGN

GN PART MARKING

1863
1867

LTC1863 LTC1867 LTC1867A

PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS

Resolution ● 12 16 16 Bits
No Missing Codes ● 12 15 16 Bits
Integral Linearity Error Unipolar (Note 7) ● ±1 ±4 ±2 LSB

Bipolar ● ±1 ±4 ±2.5 LSB

Differential Linearity Error ● ±1 –2 3 –1 1.75 LSB
Transition Noise 0.1 0.74 0.74 LSB
Offset Error Unipolar (Note 8) ● ±3 ±32 ±32 LSB

Bipolar ● ±4 ±64 ±64 LSB

Offset Error Match Unipolar ±1 ±2 ±2 LSB

Bipolar ±1 ±2 ±2 LSB
Offset Error Drift ±0.5 ±0.5 ±0.5 ppm/°C
Gain Error Unipolar ±6 ±96 ±64 LSB

Bipolar ±6 ±96 ±64 LSB
Gain Error Match ±1 ±4 ±2 LSB
Gain Error Tempco Internal Reference ±15 ±15 ±15 ppm/°C

External Reference ±2.7 ±2.7 ±2.7 ppm/°C
Power Supply Sensitivity VDD = 4.75V – 5.25V ±1 ±5 ±5 LSB

DY A IC ACCURACY

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

SNR Signal-to-Noise Ratio 1kHz Input Signal 73.6 89 dB
S/(N+D) Signal-to-(Noise + Distortion) Ratio 1kHz Input Signal 73.5 88 dB

U

W

(Note 5)

LTC1863 LTC1867/LTC1867A

RMS

18637f

2

LTC1863/LTC1867

U

W

DY A IC ACCURACY

SYMBOL PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS

THD Total Harmonic Distortion 1kHz Input Signal, Up to 5th Harmonic –94.5 – 95 dB

Peak Harmonic or Spurious Noise 1kHz Input Signal –94.5 – 95 dB
Channel-to-Channel Isolation 100kHz Input Signal –100 –117 dB
Full Power Bandwidth –3dB Point 1.25 1.25 MHz

(Note 5)

LTC1863 LTC1867/LTC1867A

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A ALOG I PUT

specifications are at TA = 25°C. (Note 5)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

Analog Input Range Unipolar Mode (Note 9) ● 0-4.096 V

C

t

IN

ACQ

Analog Input Capacitance for CH0 to Between Conversions (Sample Mode) 32 pF
CH7/COM During Conversions (Hold Mode) 4 pF

Sample-and-Hold Acquisition Time ● 1.5 1.1 µs
Input Leakage Current On Channels, CHX = 0V or V

The ● denotes the specifications which apply over the full operating temperature range, otherwise

LTC1863/LTC1867/LTC1867A

Bipolar Mode

DD

● ±2.048 V

● ±1 µA

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I TER AL REFERE CE CHARACTERISTICS

(Note 5)

LTC1863/LTC1867/LTC1867A

PARAMETER CONDITIONS MIN TYP MAX UNITS

V

Output Voltage I

REF

V

Output Tempco I

REF

V

Line Regulation 4.75V ≤ VDD ≤ 5.25V 0.43 mV/V

REF

V

Output Resistance I

REF

REFCOMP Output Voltage I

= 0 2.480 2.500 2.520 V

OUT

= 0 ±15 ppm/°C

OUT

 ≤0.1mA 6 kΩ

OUT

= 0 4.096 V

OUT

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DIGITAL I PUTS A D DIGITAL OUTPUTS

full operating temperature range, otherwise specifications are at TA = 25°C. (Note 5)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

IH

V

IL

I

IN

C

IN

V

OH

V

OL

I

SOURCE

I

SINK

High Level Input Voltage VDD = 5.25V ● 2.4 V
Low Level Input Voltage VDD = 4.75V ● 0.8 V
Digital Input Current VIN = 0V to V
Digital Input Capacitance 2pF
High Level Output Voltage (SDO) VDD = 4.75V, IO = –10µA 4.75 V

= 4.75V, IO = –200µA ● 4 4.74 V

V

DD

Low Level Output Voltage (SDO) VDD = 4.75V, IO = 160µA 0.05 V

V

= 4.75V, IO = 1.6mA ● 0.10 0.4 V

DD

Output Source Current SDO = 0V –32 mA
Output Sink Current SDO = V
Hi-Z Output Leakage CS/CONV = High, SDO = 0V or V

Hi-Z Output Capacitance CS/CONV = High (Note 10)
Data Format Unipolar Straight Binary

DD

Bipolar Two’s Complement

The ● denotes the specifications which apply over the

LTC1863/LTC1867/LTC1867A

DD

DD

● ±10 µA

19 mA

● ±10 µA

● 15 pF

18637f

3

LTC1863/LTC1867

WU

POWER REQUIRE E TS

range, otherwise specifications are at TA = 25°C. (Note 5)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V
I

DD

P

DD

DISS

Supply Voltage (Note 9) 4.75 5.25 V
Supply Current f

Power Dissipation ● 6.5 9 mW

The ● denotes the specifications which apply over the full operating temperature

LTC1863/LTC1867/LTC1867A

= 200ksps ● 1.3 1.8 mA

SAMPLE

NAP Mode 150 µA
SLEEP Mode ● 0.2 3 µA

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TI I G CHARACTERISTICS

range, otherwise specifications are at TA = 25°C. (Note 5)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

f

SAMPLE

t

CONV

t

ACQ

f

SCK

t

1

t

2

t

3

t

4

t

5

t

6

t

7

t

8

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 (unless otherwise
noted).

Note 3: When these pin voltages are taken below GND or above V
will be clamped by internal diodes. This product can handle input currents
of greater than 100mA 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
greater than 100mA below GND without latchup. These pins are not
clamped to VDD.

Note 5: VDD = 5V, f

– = 2.5V for bipolar mode unless otherwise specified.

V

IN

Maximum Sampling Frequency ● 200 kHz
Conversion Time ● 3 3.5 µs
Acquisition Time ● 1.5 1.1 µs
SCK Frequency 40 MHz
CS/CONV High Time Short CS/CONV Pulse Mode ● 40 100 ns
SDO Valid After SCK↓ CL = 25pF (Note 11) ● 13 22 ns
SDO Valid Hold Time After SCK↓ CL = 25pF ● 511 ns
SDO Valid After CS/CONV↓ CL = 25pF ● 10 30 ns
SDI Setup Time Before SCK↑ ● 15 –6 ns
SDI Hold Time After SCK↑ ● 10 4 ns
SLEEP Mode Wake-Up Time C
Bus Relinquish Time After CS/CONV↑ CL = 25pF ● 20 40 ns

= 200ksps at 25°C, tr = tf = 5ns and

SAMPLE

The ● denotes the specifications which apply over the full operating temperature

LTC1863/LTC1867/LTC1867A

REFCOMP

, they

DD

= 10µF, C

= 2.2µF60ms

VREF

Note 6: Linearity, offset and gain error specifications apply for both
unipolar and bipolar modes. The INL and DNL are tested in bipolar mode.

Note 7: 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 8: Unipolar offset is the offset voltage measured from +1/2LSB
when␣ the output code flickers between 0000 0000 0000 0000 and
0000 0000 0000␣ 0001 for LTC1867 and between 0000 0000 0000 and
0000 0000 0001 for LTC1863. Bipolar offset is the offset voltage
measured from –1/2LSB when output code flickers between 0000 0000
0000 0000 and 1111 1111 1111 1111 for LTC1867, and between
0000 0000 0000 and 1111 1111 1111 for LTC1863.

Note 9: Recommended operating conditions. The input range of ±2.048V
for bipolar mode is measured with respect to V

Note 10: Guaranteed by design, not subject to test.
Note 11: t2 of 25ns maximum allows f

with 50% duty cycle and f
setup time for the receiving logic).

SCK

SCK

up to 40MHz for falling capture (with 3ns

– = 2.5V.

IN

up to 20MHz for rising capture

4

18637f

UW

TYPICAL PERFOR A CE CHARACTERISTICS

LTC1863/LTC1867

(LTC1867)

Integral Nonlinearity vs
Output Code

2.0

1.5

1.0

0.5

0

INL (LSB)

– 0.5

– 1.0

– 1.5

– 2.0

0

16384 32768 65536

OUTPUT CODE

4096 Points FFT Plot (fIN = 1kHz)

0

–20

–40

–60

–80

AMPLITUDE (dB)

–100

–120

SNR = 88.8dB
SINAD = 87.9dB
THD = 95dB
f

SAMPLE

INTERNAL REFERENCE

49152

= 200ksps

18637 GO1

Differential Nonlinearity vs
Output Code

2.0

1.5

1.0

0.5

0

DNL (LSB)

– 0.5

– 1.0

– 1.5

– 2.0

0

OUTPUT CODE

4096 Points FFT Plot (fIN = 1kHz,
REFCOMP = External 5V)

0

–20

–40

–60

–80

AMPLITUDE (dB)

–100

–120

SNR = 90dB
SINAD = 88.5dB
THD = 94dB
f

SAMPLE

V

REF

REFCOMP = EXT 5V

4915216384 32768 65536

18637 GO2

= 200ksps

= 0V

Histogram for 4096 Conversions

2500

2000

1500

COUNTS

1000

500

0

1

–4

935

276

26

–2–3

Crosstalk vs Input Frequency

–80

–90

–100

–110

–120

SELECTED CHANNEL (dB)

RESULTING AMPLITUDE ON

–130

ADJACENT PAIR

2152

579

122

0–1

CODE

NONADJACENT PAIR

5
321

0
4

18637 GO3

–140

25 50 100

0

FREQUENCY (kHz)

Signal-to-Noise Ratio vs
Frequency

100

90

80

70

60

50

AMPLITUDE (dB)

40

30

20

1

INPUT FREQUENCY (kHz)

75

18637 G04

10 100

18637 G07

–140

25 50 100

0

FREQUENCY (kHz)

Signal-to-(Noise + Distortion) vs
Input Frequency

100

90

80

70

60

50

AMPLITUDE (dB)

40

30

20

1

INPUT FREQUENCY (kHz)

10 100

75

18637 G05

–140

1

ACTIVE CHANNEL INPUT FREQUENCY (kHz)

10 100 1000

18637 G06

Total Harmonic Distortion vs
Input Frequency

–20

–30

–40

–50

–60

–70

AMPLITUDE (dB)

–80

–90

–100

1

INPUT FREQUENCY (kHz)

18637 G08

10 100

18637 G09

18637f

5