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PDF LTC1401I Data sheet ( Hoja de datos )
| Número de pieza | LTC1401I | |
| Descripción | Complete SO-8/ 12-Bit/ 200ksps ADC with Shutdown | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Complete 12-Bit ADC with Reference in SO-8
s Single Supply 3V Operation
s Sample Rate: 200ksps
s Power Dissipation: 15mW (Typ)
s 68dB S/(N + D) and – 72dB THD at 50kHz
s No Missing Codes Over Temperature
s Nap Mode with Instant Wake-Up: 1.5mW
s Sleep Mode: 19.5µW
s Shutdown Mode: 13.5µW
s High Impedance Analog Input
s Input Range (0.5mV/LSB): 0V to 2.048V
s Internal Reference Can Be Overdriven Externally
s 3-Wire Interface to DSPs and Processors (SPI and
MICROWIRETM Compatible)
U
APPLICATIONS
s Low Power and Battery-Operated Systems
s Handheld or Portable Instruments
s High Speed Data Acquisition
s Digital Signal Processing
s Multiplexed Data Acquisition Systems
s Telecommunication
s Digital Radio
s Spectrum Analysis
LTC1401
Complete
SO-8, 12-Bit, 200ksps
ADC with Shutdown
DESCRIPTION
The LTC ®1401 is a complete 200ksps, 12-bit A/D con-
verter that converts 0V to 2.048V unipolar input and draws
only 15mW from a single 3V supply. This easy-to-use
device comes complete with a 315ns sample-and-hold
and a precision reference. Maximum DC specifications
include ±1LSB INL, ±1LSB DNL and 45ppm/°C full-scale
drift over temperature.
The LTC1401 has three power saving modes: Nap and
Sleep, through the serial interface and Shutdown by
setting the SHDN pin to zero. In Nap mode, it consumes
only 1.5mW of power and can wake up and convert
immediately. In Sleep (Shutdown) mode, it consumes
19.5µW (13.5µW) of power typically. Upon power-up
from Sleep or Shutdown mode, a reference ready (REFRDY)
signal is available in the serial word to indicate that the
reference has settled and the chip is ready to convert.
The 3-wire serial port allows compact and efficient data
transfer to a wide range of microprocessors, microcon-
trollers and DSPs.
, LTC and LT are registered trademarks of Linear Technology Corporation.
MICROWIRE is a trademark of National Semiconductor Corporation.
TYPICAL APPLICATION
Single 3V Supply, 200kHz, 12-Bit Sampling A/D Converter
3V
+
10µF
ANALOG INPUT
(0V TO 2.048V)
1.20V +
10µF
1
VCC
8
SHDN
0.1µF
LTC1401
2
AIN
7
CONV
3 VREF
4
0.1µF GND
CLK
DOUT
6
5
SERIAL
DATA LINK
MPU
P1.4
P1.3
P1.2
1401 TA01
Power Consumption vs Sample Rate
100
3.2MHz CLOCK
TA = 25°C
10 NORMAL CONVERSION
NAP MODE
1 BETWEEN CONVERSION
0.1
SHUTDOWN MODE
0.01 BETWEEN CONVERSION
SLEEP MODE BETWEEN
CONVERSION
0.001
0.01 0.1 1 10 100 1k 10k 100k 1M
SAMPLE RATE (Hz)
LTC1401 • TA02
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1401
Differential Nonlinearity vs
Output Code
1.0
fSAMPLE = 200kHz
0.5
0
–0.5
–1.0
0 512 1024 1536 2048 2560 3072 3584 4096
CODE
LTC1401 • TPC01
Signal-to-Noise Ratio (Without
Harmonics) vs Input Frequency
80
70
60
50
40
30
20
10 TA = 25°C
fSAMPLE = 200kHz
0
10
100
INPUT FREQUENCY (kHz)
1000
LTC1401 • TPC04
Reference Voltage vs
Load Current
1.40
1.35 TA = 25°C
1.30
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
–7 –6 –5 –4 –3 –2 –1 0 1 2
LOAD CURRENT (mA)
LTC1401 • TPC07
Integral Nonlinearity vs
Output Code
1.0
fSAMPLE = 200kHz
0.5
0
–0.5
–1.0
0 512 1024 1536 2048 2560 3072 3584 4096
CODE
LTC1401 • TPC02
Peak Harmonic or Spurious Noise
vs Input Frequency
0
–10
TA = 25°C
fSAMPLE = 200kHz
–20
–30
–40
–50
–60
–70
–80
–90
10
100
INPUT FREQUENCY (kHz)
1000
LTC1401 • TPC05
Power Supply Feedthrough vs
Ripple Frequency
0
–10
fSAMPLE = 200kHz
fIN = 49.853kHz
–20 VCC (VRIPPLE = 1mV)
–30
–40
–50
–60
–70
–80
–90
–100
1
10 100 1000
RIPPLE FREQUENCY (kHz)
LTC1401 • TPC08
S/(N + D) vs Input Frequency
and Amplitude
80
70
VIN = 0dB
TA = 25°C
fSAMPLE = 200kHz
60
VIN = –20dB
50
40
30
20
VIN = –60dB
10
0
10
100
INPUT FREQUENCY (kHz)
1000
LTC1401 • TPC03
Acquisition Time vs
Source Impedance
4500
TA = 25°C
4000
3500
3000
2500
2000
1500
1000
500
0
10 100 1k 10k
SOURCE RESISTANCE (Ω)
LTC1401 • TPC06
Supply Current vs Temperature
12
fSAMPLE = 200kHz
10
VIN = 3.6V
8
6 VIN = 3V
4
VIN = 2.7V
2
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (˚C)
LTC1401 • TPC09
5
5 Page 
LTC1401
APPLICATIONS INFORMATION
R1
50Ω
VIN
+
A1
R2
10k
– R4
100Ω
AIN
LTC1401
R3
10k FULL-SCALE
ADJUST
GND
ADDITIONAL PINS OMITTED FOR CLARITY
±20LSB TRIM RANGE
LTC1401 • F09a
Figure 9a. LTC1401 Full-Scale Adjust Circuit
ANALOG
INPUT
0V TO 2.048V
R1
10k
10k
3V
+
R2 A1
10k –
R9
20Ω
AIN
R4
100k
R5
4.3k
FULL-SCALE
ADJUST
LTC1401
R3
100k
R7
100k
R6
400Ω
3V
R8
10k
OFFSET
ADJUST
LTC1401 • F09b
Figure 9b. LTC1401 Offset and Full-Scale Adjust Circuit
optimum performance, a 10µF surface mount AVX capaci-
tor in parallel with a 0.1µF ceramic is recommended for the
VCC and VREF pins. The capacitors must be located as close
to the pins as possible. The traces connecting the pins and
the bypass capacitors must be kept short and should be
made as wide as possible.
Input signal leads to AIN and signal return leads from GND
(Pin 4) should be kept as short as possible to minimize
noise coupling. In applications where this is not possible,
a shielded cable between the analog input signal and the
ADC is recommended. Also, any potential difference in
grounds between the analog signal and the ADC appears
as an error voltage in series with the analog input signal.
Attention should be paid to reducing the ground circuit
impedance as much as possible.
Figure 10 shows the recommended system ground con-
nections. All analog circuitry grounds should be termi-
nated at the LTC1401 GND pin. The ground return to the
power supply from Pin 4 should be low impedance for
noise free operation. Digital circuitry grounds must be
connected to the digital supply common.
ANALOG SUPPLY
GND 3V
DIGITAL SUPPLY
GND 3V
++
BOARD LAYOUT AND BYPASSING
Wire wrap boards are not recommended for high resolu-
tion or high speed A/D converters. To obtain the best
performance from the LTC1401, a printed circuit board is
required. Layout for the printed circuit board should
ensure that digital and analog signal lines are separated as
much as possible. In particular, care should be taken not
to run any digital traces alongside an analog signal trace
or underneath the ADC. The analog input should be
screened by GND.
High quality tantalum and ceramic bypass capacitors
should be used at the VCC and VREF pins as shown in the
Typical Application on the first page of this datasheet. For
GND
VCC GND
VCC
LTC1401
DIGITAL CIRCUITRY
LTC1401 • F10
Figure 10. Power Supply Connection
Power-Down Mode
Upon power up, the LTC1401 is initialized to the active
state and is ready for conversion. However, the chip can be
easily placed into Nap or Sleep mode by exercising the
right combination of CLK and CONV signals. In Nap mode,
all power is off except the internal reference which remains
active and provides 1.20V output voltage to the other
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC1401I.PDF ] | |
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