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PDF LTC1864L Data sheet ( Hoja de datos )
| Número de pieza | LTC1864L | |
| Descripción | (LTC1864L / LTC1865L) 16-Bit 1/2-Channel 150ksps ADCs | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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( DataSheet : www.DataSheet4U.com )
FEATURES
s 16-Bit 150ksps ADCs in MSOP Package
s Single 3V Supply
s Low Supply Current: 450µA (Typ)
s Auto Shutdown Reduces Supply Current
to 10µA at 1ksps
s True Differential Inputs
s 1-Channel (LTC1864L) or 2-Channel (LTC1865L)
Versions
s SPI/MICROWIRETM Compatible Serial I/O
s 16-Bit Upgrade to 12-Bit LTC1285/LTC1288
s Pin Compatible with 12-Bit LTC1860L/LTC1861L
s No Minimum Data Transfer Rate
U
APPLICATIO S
s High Speed Data Acquisition
s Portable or Compact Instrumentation
s Low Power Battery-Operated Instrumentation
s Isolated and/or Remote Data Acquisition
LTC1864L/LTC1865L
µPower, 3V, 16-Bit, 150ksps
1- and 2-Channel ADCs in MSOP
DESCRIPTIO
The LTC®1864L/LTC1865L are 16-bit A/D converters that
are offered in MSOP and SO-8 packages and operate on a
single 3V supply. At 150ksps, the supply current is only
450µA. The supply current drops at lower speeds because
the LTC1864L/LTC1865L automatically power down
between conversions. These 16-bit switched capacitor
successive approximation ADCs include sample-and-holds.
The LTC1864L has a differential analog input with an
external reference pin. The LTC1865L offers a software-
selectable 2-channel MUX and an external reference pin on
the MSOP version.
The 3-wire, serial I/O, small MSOP or SO-8 package and
extremely high sample rate-to-power ratio make these
ADCs ideal choices for compact, low power, high speed
systems.
These ADCs can be used in ratiometric applications or
with external references. The high impedance analog
inputs and the ability to operate with reduced spans down
to 1V full scale allow direct connection to signal sources
in many applications, eliminating the need for external
gain stages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATIO
Single 3V Supply, 150ksps, 16-Bit Sampling ADC
1µF
3V
ANALOG INPUT
0V TO 3V
LTC1864L
1
VREF
2 IN+
8
VCC
7
SCK
3 IN–
6
SDO
4
GND
5
CONV
1864 TA01
SERIAL DATA LINK TO
ASIC, PLD, MPU, DSP
OR SHIFT REGISTERS
www.DataSheet4U.com
Supply Current vs Sampling Frequency
1000
100
CONV LOW = 2µs
TA = 25°C
VCC = 2.7V
10
1
0.1
0.01
0.1 1 10 100 1000
SAMPLING FREQUENCY (kHz) www.DataSheet4U.com
1864L/65L TA02
18645Lf
1
1 page  
LTC1864L/LTC1865L
TYPICAL PERFOR A CE CHARACTERISTICS
Supply Current vs Sampling
Frequency
1000
CONV LOW = 2µs
TA = 25°C
VCC = 2.7V
100
10
1
0.1
0.01
0.1 1 10 100 1000
SAMPLING FREQUENCY (kHz)
1864L/65L G01
Reference Current vs
Sampling Rate
10
CONV LOW = 2µs
9 TA = 25°C
8
VCC = 2.7V
VREF = 2.5V
7
6
5
4
3
2
1
0
0 25 50 75 100 125 150
SAMPLING FREQUENCY (kHz)
1864L/65L G04
Supply Current vs Temperature
600
fS = 150kHz
VCC = 2.7V
500 VREF = 2.5V
400
300
200
100
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1864L/65L G02
Reference Current vs
Temperature
25
fS = 150kHz
VCC = 2.7V
20 VREF = 2.5V
15
10
5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1864L/65L G05
Typical INL Curve
4
VCC = 2.7V
VREF = 2.5V
fS = 150kHz
2
Typical DNL Curve
2
VCC = 2.7V
VREF = 2.5V
fS = 150kHz
1
Sleep Current vs Temperature
20
fS = 150kHz
VCC = 2.7V
VREF = 2.5V
15
10
5
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1864L/65L G03
Reference Current vs
Reference Voltage
25
fS = 150kHz
TA = 25°C
20 VCC = 3.6V
15
10
5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
REFERENCE VOLTAGE (V)
1864L/65L G06
Analog Input Leakage Current vs
Temperature
100
CONV = 0V
VCC = 2.7V
VREF = 2.5V
75
0 0 50
–2 –1 25
–4
0
16384
32768
CODE
49152 65536
1865 G02
–2
0
16384
32768
CODE
49152 65536
1865 G03
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1864L/65L G09
18645Lf
5
5 Page 
LTC1864L/LTC1865L
APPLICATIO S I FOR ATIO
GENERAL ANALOG CONSIDERATIONS
Grounding
The LTC1864L/LTC1865L should be used with an analog
ground plane and single point grounding techniques. Do
not use wire wrapping techniques to breadboard and
evaluate the device. To achieve the optimum performance,
use a printed circuit board. The ground pins (AGND and
DGND for the LTC1865L MSOP package and GND for the
LTC1864L and LTC1865L SO-8 package) should be tied
directly to the analog ground plane with minimum lead
length.
Bypassing
For good performance, the VCC and VREF pins must be free
of noise and ripple. Any changes in the VCC/VREF voltage
with respect to ground during the conversion cycle can
induce errors or noise in the output code. Bypass the VCC
and VREF pins directly to the analog ground plane with a
minimum of 1µF tantalum. Keep the bypass capacitor
leads as short as possible.
Analog Inputs
Because of the capacitive redistribution A/D conversion
techniques used, the analog inputs of the LTC1864L/
LTC1865L have capacitive switching input current spikes.
These current spikes settle quickly and do not cause a
problem if source resistances are less than 200Ω or high
speed op amps are used (e.g., the LT®1211, LT1469,
LT1807, LT1810, LT1630, LT1226 or LT1215). But if large
source resistances are used, or if slow settling op amps
drive the inputs, take care to ensure the transients caused
by the current spikes settle completely before the conver-
sion begins.
1111111111111111
1111111111111110
•
•
•
0000000000000001
0000000000000000
*VIN = (SELECTED “+” CHANNEL) –
(SELECTED “–” CHANNEL)
REFER TO TABLE 1
Figure 5. LTC1865L Transfer Curve
VIN*
1864 F05
18645Lf
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1864L.PDF ] | |
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