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PDF LTC2400IS8 Data sheet ( Hoja de datos )
| Número de pieza | LTC2400IS8 | |
| Descripción | 24-Bit uPower No Latency ADC in SO-8 | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC2400
24-Bit µPower
No Latency ∆ΣTM ADC in SO-8
FEATURES
s 24-Bit ADC in SO-8 Package
s 4ppm INL, No Missing Codes
s 4ppm Full-Scale Error
s Single Conversion Settling Time
for Multiplexed Applications
s 0.5ppm Offset
s 0.3ppm Noise
s Internal Oscillator—No External Components
Required
s 110dB Min, 50Hz/60Hz Notch Filter
s Reference Input Voltage: 0.1V to VCC
s Live Zero—Extended Input Range Accommodates
12.5% Overrange and Underrange
s Single Supply 2.7V to 5.5V Operation
s Low Supply Current (200µA) and Auto Shutdown
U
APPLICATIO S
s Weight Scales
s Direct Temperature Measurement
s Gas Analyzers
s Strain-Gage Transducers
s Instrumentation
s Data Acquisition
s Industrial Process Control
s 6-Digit DVMs
DESCRIPTIO
The LTC®2400 is a 2.7V to 5.5V micropower 24-bit
converter with an integrated oscillator, 4ppm INL and
0.3ppm RMS noise. It uses delta-sigma technology and
provides single cycle settling time for multiplexed appli-
cations. Through a single pin the LTC2400 can be config-
ured for better than 110dB rejection at 50Hz or 60Hz ±2%,
or it can be driven by an external oscillator for a user
defined rejection frequency in the range 1Hz to 120Hz.
The internal oscillator requires no external frequency
setting components.
The converter accepts any external reference voltage from
0.1V to VCC. With its extended input conversion range of
–12.5% VREF to 112.5% VREF, the LTC2400 smoothly
resolves the offset and overrange problems of preceding
sensors or signal conditioning circuits.
The LTC2400 communicates through a flexible 3-wire
digital interface which is compatible with SPI and
MICROWIRETM 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.
TYPICAL APPLICATIO
2.7V TO 5.5V
1µF
VCC
FO
REFERENCE
VOLTAGE
0.1V TO VCC
ANALOG
INPUT RANGE
–0.12VREF TO 1.12VREF
LTC2400
VREF
SCK
VIN SDO
GND CS
VCC
= INTERNAL OSC/50Hz REJECTION
= EXTERNAL CLOCK SOURCE
= INTERNAL OSC/60Hz REJECTION
3-WIRE
SPI INTERFACE
2400 TA01
Total Unadjusted Error vs Output Code
10
8
VCC = 5V
VREF = 5V
6 TA = 25°C
FO = LOW
4
2
0
–2
–4
–6
–8
–10
0
8,338,608
OUTPUT CODE (DECIMAL)
16,777,215
2400 TA02
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
Total Unadjusted Error
(3V Supply)
10
VCC = 3V
VREF = 3V
5
0
TA = –55°C, –45°C, 25°C, 90°C
–5
INL (3V Supply)
10
VCC = 3V
VREF = 3V
5
TA = –55°C, –45°C, 25°C, 90°C
0
–5
–10
0
0.5 1.0 1.5 2.0 2.5 3.0
INPUT VOLTAGE (V)
2400 G01
Positive Input Extended Total
Unadjusted Error (3V Supply)
10
VCC = 3V
VREF = 3V
5
TA = – 55°C
0 TA = – 45°C
TA = 90°C
TA = 25°C
–5
– 10
3.0
3.1 3.2
INPUT VOLTAGE (V)
3.3
2400 G04
Negative Input Extended Total
Unadjusted Error (5V Supply)
10
VCC = 5V
VREF = 5V
TA = 90°C
5
TA = 25°C
0
TA = – 45°C
–5
TA = – 55°C
– 10
0
– 0.05 – 0.10 – 0.15 – 0.20 – 0.25 – 0.30
INPUT VOLTAGE (V)
2400 G07
–10
0
0.5 1.0 1.5 2.0 2.5 3.0
INPUT VOLTAGE (V)
2400 G02
Total Unadjusted Error
(5V Supply)
10
VCC = 5V
8 VREF = 5V
6
4
2
0
–2
TA = –55°C, –45°C, 25°C, 90°C
–4
–6
–8
–10
0
1 2 34
INPUT VOLTAGE (V)
5
2400 G05
Positive Input Extended Total
Unadjusted Error (5V Supply)
10
VCC = 5V
VREF = 5V
5
TA = – 55°C
0 TA = – 45°C
TA = 90°C
TA = 25°C
–5
– 10
5.0
5.1 5.2
INPUT VOLTAGE (V)
5.3
2400 G08
LTC2400
Negative Input Extended Total
Unadjusted Error (3V Supply)
10
VCC = 3V
VREF = 3V
TA = 90°C
5
TA = 25°C
0
TA = – 45°C
– 5 TA = – 55°C
– 10
0
– 0.05 – 0.10 – 0.15 – 0.20 – 0.25 – 0.30
INPUT VOLTAGE (V)
2400 G03
INL (5V Supply)
10
VCC = 5V
VREF = 5V
5
0
TA = –55°C, –45°C, 25°C, 90°C
–5
–10
0
1 2 34
INPUT VOLTAGE (V)
5
2400 G06
Offset Error vs Reference Voltage
6
VCC = 5V
5 TA = 25°C
4
3
2
1
0
–1
012345
REFERENCE VOLTAGE
2400 G09
5
5 Page 
LTC2400
APPLICATIONS INFORMATION
VCC + 0.3V
9/8VREF
VREF
1/2VREF
NORMAL
INPUT
RANGE
EXTENDED
INPUT
RANGE
ABSOLUTE
MAXIMUM
INPUT
RANGE
0
–1/8VREF
–0.3V
2400 F02
Figure 2. LTC2400 Input Range
For large values of VREF this range is limited by the
absolute maximum voltage range of – 0.3V to (VCC + 0.3V).
Beyond this range the input ESD protection devices begin
to turn on and the errors due to the input leakage current
increase rapidly.
Input signals applied to VIN may extend below ground by
– 300mV and above VCC by 300mV. In order to limit any
fault current, a resistor of up to 5k may be added in series
with the VIN pin without affecting the performance of the
device. In the physical layout, it is important to maintain
the parasitic capacitance of the connection between this
series resistance and the VIN pin as low as possible;
therefore, the resistor should be located as close as
practical to the VIN pin. The effect of the series resistance
on the converter accuracy can be evaluated from the
curves presented in the Analog Input/Reference Current
section. In addition a series resistor will introduce a
temperature dependent offset error due to the input leak-
age current. A 1nA input leakage current will develop a
1ppm offset error on a 5k resistor if VREF = 5V. This error
has a very strong temperature dependency.
Output Data Format
The LTC2400 serial output data stream is 32 bits long. The
first 4 bits represent status information indicating the
sign, input range and conversion state. The next 24 bits are
the conversion result, MSB first. The remaining 4 bits are
sub LSBs beyond the 24-bit level that may be included in
averaging or discarded without loss of resolution.
Bit 31 (first output bit) is the end of conversion (EOC)
indicator. This bit is available at the SDO pin during the
conversion and sleep states whenever the CS pin is LOW.
This bit is HIGH during the conversion and goes LOW
when the conversion is complete.
Bit 30 (second output bit) is a dummy bit (DMY) and is
always LOW.
Bit 29 (third output bit) is the conversion result sign indi-
cator (SIG). If VIN is >0, this bit is HIGH. If VIN is <0, this
bit is LOW. The sign bit changes state during the zero code.
Bit 28 (forth output bit) is the extended input range (EXR)
indicator. If the input is within the normal input range
0␣ ≤␣ VIN ≤ VREF, this bit is LOW. If the input is outside the
normal input range, VIN > VREF or VIN < 0, this bit is HIGH.
The function of these bits is summarized in Table 1.
Table 1. LTC2400 Status Bits
Input Range
Bit 31
EOC
VIN > VREF
0 < VIN ≤ VREF
VIN = 0+/0–
VIN < 0
0
0
0
0
Bit 30
DMY
0
0
0
0
Bit 29
SIG
1
1
1/0
0
Bit 28
EXR
1
0
0
1
Bit 27 (fifth output bit) is the most significant bit (MSB).
Bits 27-4 are the 24-bit conversion result MSB first.
Bit 4 is the least significant bit (LSB).
Bits 3-0 are sub LSBs below the 24-bit level. Bits 3-0 may
be included in averaging or discarded without loss of
resolution.
Data is shifted out of the SDO pin under control of the serial
clock (SCK), see Figure 3. Whenever CS is HIGH, SDO
remains high impedance and any SCK clock pulses are
ignored by the internal data out shift register.
In order to shift the conversion result out of the device, CS
must first be driven LOW. EOC is seen at the SDO pin of the
device once CS is pulled LOW. EOC changes real time from
HIGH to LOW at the completion of a conversion. This
signal may be used as an interrupt for an external
microcontroller. Bit 31 (EOC) can be captured on the first
rising edge of SCK. Bit 30 is shifted out of the device on the
first falling edge of SCK. The final data bit (Bit 0) is shifted
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC2400IS8.PDF ] | |
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