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LTC2435-1

Description
20-Bit No Latency ADCs with Differential Input and Differential Reference
File Size470KB,40 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC2435-1 Overview

20-Bit No Latency ADCs with Differential Input and Differential Reference

LTC2435/LTC2435-1
20-Bit No Latency
∆Σ
TM
ADCs with Differential Input and
Differential Reference
DESCRIPTIO
The LTC
®
2435/2435-1 are 2.7V to 5.5V micropower
20-bit differential
∆Σ
analog to digital converters with
integrated oscillator, 3ppm INL and 0.8ppm RMS noise.
They use delta-sigma technology and provide single cycle
settling time for multiplexed applications. Through a
single pin, the LTC2435 can be configured for better than
110dB input differential mode rejection at 50Hz or 60Hz
±2%,
or it can be driven by an external oscillator for a user
defined rejection frequency. The LTC2435-1 can be con-
figured for better than 87dB input differential mode rejec-
tion over the range of 49Hz to 61.2Hz (50Hz and 60Hz
±2%
simultaneously). The internal oscillator requires no
external frequency setting components.
The converters accept any external differential reference
voltage from 0.1V to V
CC
for flexible ratiometric and
remote sensing measurement configurations. The full-
scale differential input range is from – 0.5V
REF
to 0.5V
REF
.
The reference common mode voltage, V
REFCM
, and the
input common mode voltage, V
INCM
, may be indepen-
dently set anywhere within the GND to V
CC
range of the
LTC2435/LTC2435-1. The DC common mode input rejec-
tion is better than 120dB.
The LTC2435/LTC2435-1 communicate through a flexible
3-wire digital interface which is compatible with SPI and
MICROWIRE
TM
protocols.
, LTC and LT are registered trademarks of Linear Technology Corporation.
No Latency
∆Σ
is a trademark of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
Protected by U.S. Patents including 6140950, 6169506.
FEATURES
2× Speed Up Version of the LTC2430: 15Hz Output
×
Rate, 60Hz Notch—LTC2435; 13.75Hz Output Rate,
Simultaneous 50Hz/60Hz Notch—LTC2435-1
Differential Input and Differential Reference with
GND to V
CC
Common Mode Range
3ppm INL, No Missing Codes
10ppm Gain Error
0.8ppm Noise
Single Conversion Settling Time for Multiplexed
Applications
Internal Oscillator—No External Components
Required
Single Supply 2.7V to 5.5V Operation
Low Supply Current (200µA,4µA in Auto Sleep)
20-Bit ADC in Narrow SSOP-16 Package
(SO-8 Footprint)
APPLICATIO S
Direct Sensor Digitizer
Weight Scales
Direct Temperature Measurement
Gas Analyzers
Strain Gage Transducers
Instrumentation
Data Acquisition
Industrial Process Control
6-Digit DVMs
TYPICAL APPLICATIO S
2.7V TO 5.5V
2
14
INL (ppm OF V
REF
)
10
8
6
V
CC
1µF
V
CC
F
O
LTC2435/
LTC2435-1
REFERENCE
VOLTAGE
0.1V TO V
CC
ANALOG INPUT RANGE
–0.5V
REF
TO 0.5V
REF
3
4
5
6
REF
+
REF
IN
+
IN
= INTERNAL OSC/50Hz REJECTION (LTC2435)
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION (LTC2435)
= INTERNAL 50Hz/60Hz REJECTION (LTC2435-1)
SCK
13
3-WIRE
SPI INTERFACE
–2
–4
–6
–8
F
O
= GND
V
CC
= 5V
V
REF
= 5V
V
INCM
= V
INCM
= 2.5V
–1.5
SDO
CS
12
11
1, 7, 8, 9, 10, 15, 16
GND
–10
–2.5
2435 TA01
U
4
2
0
U
U
Integral Nonlinearity vs Input
T
A
= 25°C
T
A
= 85°C
T
A
= –45°C
–0.5
0.5
1.5
INPUT VOLTAGE (V)
2.5
2435 G04
24351fa
1

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