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PDF LTC1863L Data sheet ( Hoja de datos )
| Número de pieza | LTC1863L | |
| Descripción | (LTC1863L / LTC1867L) 12-/16-Bit 8-Channel 175ksps ADCs | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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( DataSheet : www.DataSheet4U.com )
FEATURES
■ Sample Rate: 175ksps
■ 16-Bit No Missing Codes and ±3LSB Max INL
■ 8-Channel Multiplexer with:
Single Ended or Differential Inputs and
Unipolar or Bipolar Conversion Modes
■ SPI/MICROWIRETM Serial I/O
■ 2.7V Guaranteed Supply Voltage
■ Pin Compatible with LTC1863/LTC1867
■ True Differential Inputs
■ On-Chip or External Reference
■ Low Power: 750µA at 175ksps, 300µA at 50ksps
■ Sleep Mode
■ Automatic Nap Mode Between Conversions
■ 16-Pin Narrow SSOP Package
U
APPLICATIO S
■ Industrial Process Control
■ High Speed Data Acquisition
■ Battery Operated Systems
■ Multiplexed Data Acquisition Systems
■ Imaging Systems
LTC1863L/LTC1867L
Micropower, 3V,
12-/16-Bit, 8-Channel
175ksps ADCs
DESCRIPTIO
The LTC®1863L/LTC1867L are pin compatible, 8-channel
12-/16-bit A/D converters with serial I/O and an internal
reference.
The 8-channel input multiplexer can be configured for
either single-ended or differential inputs and unipolar or
bipolar conversions (or combinations thereof). The ADCs
convert 0V to 2.5V unipolar inputs or ±1.25V bipolar
inputs. The ADCs typically draw only 750µA from a single
2.7V supply. The automatic nap and sleep modes benefit
power sensitive applications.
The LTC1867L’s DC performance is outstanding with a
±3LSB INL specification and 16-bit no missing codes over
temperature.
Housed in a compact, narrow 16-pin SSOP package, the
LTC1863L/LTC1867L can be used in space-sensitive as
well as low power applications.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
BLOCK DIAGRA
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM
1
2
3
4
5
6
7
8
ANALOG
INPUT
MUX
LTC1863L/LTC1867L
16 VDD
15 GND
+ 12-/16-BIT
–
175ksps
ADC
SERIAL
PORT
14 SDI
13 SDO
12 SCK
11 CS/CONV
10 VREF
INTERNAL
1.25V REF
9
REFCOMP
1863L7L BD
www.DataSheet4U.com
Integral Nonlinearity vs Output Code
(LTC1867L)
2.0
VDD = 2.7V
1.5 fSAMPLE = 175ksps
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
16384 32768 49152 65536
OUTPUT CODE
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1863L7L G01
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1 page  
LTC1863L/LTC1867L
TYPICAL PERFOR A CE CHARACTERISTICS (LTC1867L)
Integral Nonlinearity
vs Output Code
2.0
VDD = 2.7V
1.5 fSAMPLE = 175ksps
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
16384 32768 49152
OUTPUT CODE
65536
1863L7L G01
4096 Points FFT Plot
(VDD = 3V, REFCOMP = Ext 3V)
0
fSAMPLE = 175ksps
–20
fIN = 1kHz
SNR = 84.7dB
SINAD = 83.5dB
–40 THD = 90dB
–60
–80
–100
–120
–140
0
21.875 43.75 65.625
FREQUENCY (kHz)
87.5
1863L7L G04
Total Harmonic Distortion
vs Input Frequency
–100
–90
–80
SFDR
–70
THD
–60
–50
–40
VDD = 3V
–30 INTERNAL REF
fSAMPLE = 175ksps
–20
1
10
INPUT FREQUENCY (kHz)
100
1863L7L G06
Differential Nonlinearity
vs Output Code
2.0
VDD = 2.7V
1.5 fSAMPLE = 175ksps
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
0
16384 32768 49152
OUTPUT CODE
65536
1863L7L G02
Crosstalk vs Input Frequency
–60
VDD = 3V
–70 fSAMPLE = 175ksps
–80
–90
–100
–110
ADJACENT PAIR
–120
–130
NONADJACENT
PAIR
–140
0.1 1 10 100 1000
ACTIVE CHANNEL INPUT FREQUENCY (kHz)
1863L7L G05
Power Supply Feedthrough
vs Ripple Frequency
–20
VDD = 3V
–30 fSAMPLE = 175ksps
VRIPPLE = 10mVP-P
–40
–50
–60
–70
–80
–90
–100
1
10 100 1000
RIPPLE FREQUENCY (kHz)
1863L7L G08
4096 Points FFT Plot
(VDD = 2.7V, Internal REF)
0
fSAMPLE = 175ksps
–20
fIN = 1kHz
SNR = 82.9dB
SINAD = 81.4dB
–40 THD = 86.8dB
–60
–80
–100
–120
–140
0
21.875 43.75 65.625
FREQUENCY (kHz)
87.5
1863L7L G03
Signal-to-(Noise + Distortion)
Ratio vs Input Frequency
100
90
SNR
80
70
SINAD
60
50
40
VDD = 3V
30 INTERNAL REF
fSAMPLE = 175ksps
20
1 10
INPUT FREQUENCY (kHz)
100
1863L7L G06
Supply Current vs fSAMPLE
(LTC1863L/LTC1867L)
800
VDD = 2.7V
700
600
500
400
300
200
100
1
10 100
fSAMPLE (ksps)
1000
1863L7L G09
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5 Page 
LTC1863L/LTC1867L
APPLICATIO S I FOR ATIO
used since these components can add distortion. NPO and
silver mica type dielectric capacitors have excellent linear-
ity. Carbon surface mount resistors can also generate
distortion from self heating and from damage that may
occur during soldering. Metal film surface mount resis-
tors are much less susceptible to both problems.
DC Performance
One way of measuring the transition noise associated with
a high resolution ADC is to use a technique where a DC
signal is applied to the input of the ADC and the resulting
output codes are collected over a large number of conver-
sions. For example, in Figure 2 the distribution of output
codes is shown for a DC input that had been digitized 4096
times. The distribution is Gaussian and the RMS code
transition noise is about 1.6LSB.
1200
1000
800
1044
895
830
VDD = 2.7V
INTERNAL REF
600
465
400
200 170
333
261
58
7
0
23 9 1
20 21 22 23 24 25 26 27 28 29 30 31
CODE
1863L7L G12
Figure 2. LTC1867L Histogram for 4096 Conversions
Dynamic Performance
FFT (Fast Fourier Transform) test techniques are used to
test the ADC’s frequency response, distortion and noise at
the rated throughput. By applying a low distortion sine
wave and analyzing the digital output using an FFT algo-
rithm, the ADC’s spectral content can be examined for
frequencies outside the fundamental.
components at the A/D output. The output is band limited
to frequencies from above DC and below half the sampling
frequency. Figure 3a shows a typical SINAD of 81.4dB with
a 175kHz sampling rate and a 1kHz input. Higher SINAD can
be obtained with a 3V supply. For example, when an exter-
nal 3V is applied to REFCOMP (tie VREF to GND), a SINAD
of 83.5dB can be achieved as shown in Figure 3b.
0
fSAMPLE = 175ksps
–20
fIN = 1kHz
SNR = 82.9dB
SINAD = 81.4dB
–40 THD = 86.8dB
–60
–80
–100
–120
–140
0
21.875 43.75 65.625
FREQUENCY (kHz)
87.5
1863L7L G03
Figure 3a. LTC1867L Nonaveraged 4096 Point
FFT Plot with 2.7V Supply
0
fSAMPLE = 175ksps
–20
fIN = 1kHz
SNR = 84.7dB
SINAD = 83.5dB
–40 THD = 90dB
REFCOMP = EXT 3V
–60
–80
–100
–120
–140
0
21.875 43.75 65.625
FREQUENCY (kHz)
87.5
1863L7L F03b
Figure 3b. LTC1867L Nonaveraged 4096 Point
FFT Plot with 3V Supply
Signal-to-Noise Ratio
The Signal-to-Noise and Distortion Ratio (SINAD) is the
ratio between the RMS amplitude of the fundamental input
frequency to the RMS amplitude of all other frequency
Total Harmonic Distortion
Total Harmonic Distortion (THD) is the ratio of the RMS
sum of all harmonics of the input signal to the fundamental
itself. The out-of-band harmonics alias into the frequency
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11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1863L.PDF ] | |
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