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LTC2428IG Datasheet

  • LTC2428IG

  • 4-/8-Channel 20-Bit uPower No Latency ADCs

  • 28頁

  • LINER

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Final Electrical Specifications
LTC2424/LTC2428
4-/8-Channel 20-Bit
碌Power
No Latency
鈭單?/div>
TM
ADCs
FEATURES
s
s
s
s
s
DESCRIPTIO
March 2000
s
s
s
s
s
s
s
s
Pin Compatible 4-/8-Channel 20-Bit ADCs
8ppm INL, No Missing Codes at 20 Bits
4ppm Full-Scale Error and 0.5ppm Offset
1.2ppm Noise
Digital Filter Settles in a Single Cycle. Each
Conversion is Accurate, Even After Changing
Channels
Fast Mode: 16-Bit Noise, 12-Bit TUE at 100sps
Internal Oscillator鈥擭o External Components
Required
110dB Min, 50Hz/60Hz Notch Filter
Reference Input Voltage: 0.1V to V
CC
Live Zero鈥擡xtended Input Range Accommodates
12.5% Overrange and Underrange
Single Supply 2.7V to 5.5V Operation
Low Supply Current (200碌A) and Auto Shutdown
Can Be Interchanged with 24-Bit LTC2404/LTC2408
if ZS
SET
Pin is Grounded
The LTC
廬
2424/LTC2428 are 4-/8-channel 2.7V to 5.5V
micropower 20-bit A/D converters with an integrated
oscillator, 8ppm INL and 1.2ppm RMS noise. They use
delta-sigma technology and provide single cycle digital
filter settling time (no latency delay) for multiplexed
applications. The first conversion after the channel is
changed is always valid. Through a single pin the LTC2424/
LTC2428 can be configured for better than 110dB rejec-
tion at 50Hz or 60Hz
鹵2%,
or can be driven by an external
oscillator for a user defined rejection frequency in the
range 1Hz to 800Hz. The internal oscillator requires no
external frequency setting components.
The converters accept any external reference voltage from
0.1V to V
CC
. With their extended input conversion range of
鈥?2.5% V
REF
to 112.5% V
REF
(V
REF
= FS
SET
鈥?ZS
SET
) the
LTC2424/LTC2428 smoothly resolve the offset and
overrange problems of preceding sensors or signal con-
ditioning circuits.
The LTC2424/LTC2428 communicate through a flexible
4-wire digital interface which is compatible with SPI and
MICROWIRE
TM
protocols.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency
鈭單?/div>
is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
APPLICATIO S
s
s
s
s
s
s
s
s
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain-Gage Transducers
Instrumentation
Data Acquisition
Industrial Process Control
4-Digit DVMs
TYPICAL APPLICATIO
7
MUXOUT
9 CH0
10 CH1
11 CH2
ANALOG
INPUTS
鈥?.12V
REF
TO
1.12V
REF
12 CH3
4-/8-CHANNEL
13 CH4*
MUX
14 CH5*
15 CH6*
17 CH7*
5 ZS
SET
4
ADCIN
0.1V TO V
CC
3
2, 8
FS
SET
V
CC
CSADC
CSMUX
20-BIT
鈭嗏垜
ADC
SCK
CLK
D
IN
SDO
23
20
25
19
21
24
V
CC
2.7V TO 5.5V
1碌F
SERIAL DATA LINK
MICROWIRE AND
SPI COMPATABLE
LINEARITY ERROR (ppm)
+
MPU
鈥?/div>
LTC2424/LTC2428
GND
F
O
24248 TA01
26
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
1, 6, 16, 18, 22, 27, 28
*THESE PINS ARE NO CONNECTS ON THE LTC2404
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
10
8
6
4
2
0
鈥?
鈥?
鈥?
鈥?
鈥?0
0
V
CC
= 5V
V
REF
= 5V
T
A
= 25擄C
F
O
= LOW
U
U
Total Unadjusted Error vs Output Code
8,338,608
OUTPUT CODE (DECIMAL)
16,777,215
24248 TA02
1

LTC2428IG 產品屬性

  • LTC2424/28

  • 47

  • 集成電路 (IC)

  • 數據采集 - 模數轉換器

  • -

  • 20

  • 7.5

  • MICROWIRE?，串行，SPI?

  • 1

  • 1mW

  • 單電源

  • -40°C ~ 85°C

  • 表面貼裝

  • 28-SSOP（0.209"，5.30mm 寬）

  • 28-SSOP

  • 管件

  • 8 個單端，單極

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