ltc1867l Linear Technology Corporation, ltc1867l Datasheet

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ltc1867l

Manufacturer Part Number
ltc1867l
Description
Ltc1863l - Micropower, 3v, 12-bit, 8-channel 175ksps Adcs
Manufacturer
Linear Technology Corporation
Datasheet

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BLOCK DIAGRA
FEATURES
APPLICATIO S
Sample Rate: 175ksps
16-Bit No Missing Codes and ±3LSB Max INL
8-Channel Multiplexer with:
SPI/MICROWIRE
2.7V Guaranteed Supply Voltage
Pin Compatible with LTC1863/LTC1867
True Differential Inputs
On-Chip or External Reference
Low Power: 750µA at 175ksps, 300µA at 50ksps
Sleep Mode
Automatic Nap Mode Between Conversions
16-Pin Narrow SSOP Package
Industrial Process Control
High Speed Data Acquisition
Battery Operated Systems
Multiplexed Data Acquisition Systems
Imaging Systems
CH7/COM
Single Ended or Differential Inputs and
Unipolar or Bipolar Conversion Modes
CH0
CH1
CH2
CH3
CH4
CH5
CH6
1
2
3
4
5
6
7
8
ANALOG
INPUT
MUX
U
TM
Serial I/O
W
+
INTERNAL
1.25V REF
LTC1863L/LTC1867L
SERIAL
PORT
1863L7L BD
16
15
14
13
12
11
10
9
V
GND
SDI
SDO
SCK
CS/CONV
V
REFCOMP
DD
REF
DESCRIPTIO
The LTC
12-/16-bit A/D converters with serial I/O and an internal
reference.
The 8-channel input multiplexer can be configured for
either single-ended or differential inputs and unipolar or
bipolar conversions (or combinations thereof). The ADCs
convert 0V to 2.5V unipolar inputs or ±1.25V bipolar
inputs. The ADCs typically draw only 750µA from a single
2.7V supply. The automatic nap and sleep modes benefit
power sensitive applications.
The LTC1867L’s DC performance is outstanding with a
±3LSB INL specification and 16-bit no missing codes over
temperature.
Housed in a compact, narrow 16-pin SSOP package, the
LTC1863L/LTC1867L can be used in space-sensitive as
well as low power applications.
All other trademarks are the property of their respective owners.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
1863L/LTC1867L are pin compatible, 8-channel
12-/16-Bit, 8-Channel
–0.5
–1.0
–1.5
–2.0
2.0
1.5
1.0
0.5
LTC1863L/LTC1867L
0
Integral Nonlinearity vs Output Code
0
V
f
SAMPLE
U
DD
= 2.7V
Micropower, 3V,
16384
= 175ksps
175ksps ADCs
(LTC1867L)
OUTPUT CODE
32768
49152
1863L7L G01
65536
1863l7lfa
1

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ltc1867l Summary of contents

Page 1

... The ADCs typically draw only 750µA from a single 2.7V supply. The automatic nap and sleep modes benefit power sensitive applications. The LTC1867L’s DC performance is outstanding with a ±3LSB INL specification and 16-bit no missing codes over temperature. Housed in a compact, narrow 16-pin SSOP package, the LTC1863L/LTC1867L can be used in space-sensitive as well as low power applications ...

Page 2

... Digital Output Voltage (SDO) ....... – 0. Power Dissipation .............................................. 500mW Operating Temperature Range LTC1863LC/LTC1867LC/LTC1867LAC .... 0°C to 70°C LTC1863LI/LTC1867LI/LTC1867LAI .. – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300° VERTER CHARACTERISTICS temperature range, otherwise specifications are at T ...

Page 3

... MIN TYP MAX ● 2.5 ±1.25 ● ● 2.01 1.68 ±1 ● LTC1863L/LTC1867L/LTC1867LA MIN TYP MAX 1.235 1.25 1.265 ±20 0.3 3 2.5 denotes the specifications which apply over the LTC1863L/LTC1867L/LTC1867LA MIN TYP MAX ● 1.9 ● 0.45 ±10 ● 2 2.68 ● 2.3 2.65 0.05 ● 0.15 0.4 –9.7 6 ±10 ● DD ● 15 Straight Binary Two’ ...

Page 4

... 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 LTC1867L and between 0000 0000 0000 and 0000 0000 0001 for LTC1863L. Bipolar offset is the offset voltage measured from – ...

Page 5

... Ratio vs Input Frequency 100 90 SNR 80 70 SINAD INTERNAL REF f = 175ksps SAMPLE INPUT FREQUENCY (kHz) 1863L7L G06 Supply Current vs f SAMPLE (LTC1863L/LTC1867L) 800 V = 2.7V DD 700 600 500 400 300 200 100 1 10 100 f (ksps) SAMPLE 1863L7L G09 87.5 100 1000 1863l7lfa 5 ...

Page 6

... CODE 1863L7L G11 Gain Error Drift (LTC1867L) vs Temperature 2. SAMPLE 10 EXT V UNIPOLAR/BIPOLAR 5 0 –5 –10 –15 –50 – 100 TEMPERATURE (°C) 1863L7L G14 ...

Page 7

... CH3 SDO LTC1867L 2.5V + CH4 SCK SINGLE-ENDED INPUT CH5 CS/CONV CH6 V REF CH7/COM REFCOMP 2.7V 3k SDO C L 1863L7L TC01 LTC1863L/LTC1867L 2.7V TO 3.6V 10µF DIGITAL I/O 1.25V 2.2µF 2.5V 10µF 1863L7L TCD Load Circuits for Output Float Delay 2.7V 3k SDO SDO ( Hi-Z ( Hi-Z 1863L7L TC02 ...

Page 8

... CS/CONV U U APPLICATIO S I FOR ATIO Overview The LTC1863L/LTC1867L are complete, low power, multi- plexed ADCs. They consist of a 12-/16-bit, 175ksps capaci- tive successive approximation A/D converter, a precision internal reference, a configurable 8-channel analog input multiplexer (MUX) and a serial port for data transfer. ...

Page 9

... Table 2. Channel Configuration (When COM = 1, CH7/COM Pin CH6 Is Used as COMMON) CH7/COM – GND ( ) 1863L7L AI01 LTC1863L/LTC1867L Changing the MUX Assignment “On the Fly” 1st Conversion 2nd Conversion – CH2 CH2 { + CH3 CH3 + CH4 CH4 { + CH5 CH5 ...

Page 10

... U APPLICATIO S I FOR ATIO Driving the Analog Inputs The analog inputs of the LTC1863L/LTC1867L are easy to drive. Each of the analog inputs can be used as a single- ended input relative to the GND pin (CH0-GND, CH1-GND, etc pairs (CH0 and CH1, CH2 and CH3, CH4 and CH5, CH6 and CH7) for differential inputs ...

Page 11

... CODE Figure 2. LTC1867L Histogram for 4096 Conversions Dynamic Performance FFT (Fast Fourier Transform) test techniques are used to test the ADC’s frequency response, distortion and noise at the rated throughput. By applying a low distortion sine wave and analyzing the digital output using an FFT algo- rithm, the ADC’ ...

Page 12

... Automatic Nap Mode 3k BANDGAP REFERENCE The LTC1863L and LTC1867L go into automatic nap mode when CS/CONV is held high after the conversion is com- plete. With a typical operating current of 750µA and auto- matic 170µA nap mode between conversions, the power dissipation drops with reduced sample rate. The ADC only keeps the the automatic nap mode ...

Page 13

... The rising edge transition of the CS/CONV will start a conversion. Once initiated, it cannot be restarted until the conversion is complete. Figures 6 and 7 show the timing diagrams for two types of CS/CONV pulses. Example 1 (Figure 6) shows the LTC1863L/LTC1867L ). After DD operating in automatic nap mode with CS/CONV signal staying HIGH after the conversion ...

Page 14

... FS = 2.5V n 100...001 1LSB = FS/2 1LSB (LTC1863L) = 610µV 100...000 1LSB (LTC1867L) = 38.1µV – –FS/2 LSB LSB INPUT VOLTAGE (V) Figure 8. LTC1863L/LTC1867L Bipolar Transfer Characteristics (Two’s Complement ACQ NOT NEEDED FOR LTC1863L ...

Page 15

... TYP .008 – .012 (0.203 – 0.305) TYP LTC1863L/LTC1867L .189 – .196* (4.801 – 4.978) .009 (0.229 REF .150 – .157** (3.810 – 3.988) ...

Page 16

... Parallel Output, Programmable MUX and Sequencer Supply 850µA at 250ksps, 2µA at 1ksps, SO-8 and MSOP Packages 450µA at 150ksps, 10µA at 1ksps, SO-8 and MSOP Packages 5V Supply, Pin Compatible with LTC1863L/LTC1867L 850µA at 250ksps, 2µA at 1ksps, SO-8 and MSOP Packages 450µA at 150ksps, 10µA at 1ksps, SO-8 and MSOP Packages www.linear.com ● ...

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