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PDF LTC1416 Data sheet ( Hoja de datos )
| Número de pieza | LTC1416 | |
| Descripción | Low Power 14-Bit/ 400ksps Sampling ADC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1416
Low Power 14-Bit, 400ksps
Sampling ADC
FEATURES
s Sample Rate: 400ksps
s Power Dissipation: 70mW
s Guaranteed ±1.5LSB DNL, ± 2LSB INL (Max)
s 80.5dB S/(N + D) and 93dB THD at 100kHz
s 80dB S/(N + D) and 90dB THD at Nyquist
s Nap and Sleep Shutdown Modes
s Operates with Internal or External Reference
s True Differential Inputs Reject Common Mode Noise
s 15MHz Full Power Bandwidth Sampling
s ±2.5V Bipolar Input Range
s 28-Pin SSOP Package
APPLICATI S
s Telecommunications
s Digital Signal Processing
s Multiplexed Data Acquisition Systems
s High Speed Data Acquisition
s Spectrum Analysis
s Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
The LTC®1416 is a 2.2µs, 400ksps, 14-bit sampling A/D
converter that draws only 70mW from ±5V supplies. This
easy-to-use device includes a high dynamic range sample-
and-hold and a precision reference. Two digitally select-
able power shutdown modes provide flexibility for low
power systems.
The LTC1416’s full-scale input range is ±2.5V. Maximum
DC specifications include ±2LSB INL, ±1.5LSB DNL over
temperature. Outstanding AC performance includes 80.5dB
S/(N + D) and 93dB THD with a 100kHz input, and 80dB
S/(N + D) and 90dB THD at the Nyquist input frequency of
200kHz.
The unique differential input sample-and-hold can ac-
quire single-ended or differential input signals up to its
15MHz bandwidth. The 60dB common mode rejection
allows users to eliminate ground loops and common
mode noise by measuring signals differentially from the
source.
The ADC has a µP compatible, 14-bit parallel output port.
There is no pipeline delay in the conversion results. A
separate convert start input and a data ready signal
(BUSY) ease connections to FIFOs, DSPs and micropro-
cessors.
TYPICAL APPLICATI
Complete, 70mW, 14-Bit ADC with 80.5dB S/(N + D)
10µF
AIN+
AIN–
REFCOMP
22µF
VREF
1µF
AVDD
DVDD
S/H 14-BIT ADC
14
LTC1416
OUTPUT
BUFFERS
•••
D13 (MSB)
D0 (LSB)
BUFFER
4k
2.5V
REFERENCE
TIMING
AND
LOGIC
VSS
10µF –5V
AGND
DGND
BUSY
CS
CONVST
RD
SHDN
1416 TA01
Effective Bits and
Signal-to-(Noise + Distortion)
vs Input Frequency
14
13
12
11 NYQUIST
10 FREQUENCY
9
8
7
6
5
4
3
2
1 fSAMPLE = 400kHz
0
1k 10k 100k
INPUT FREQUENCY (Hz)
86
80
74
68
62
1M 2M
1416 TA02
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1416
S/(N + D) vs Input Frequency
and Amplitude
90
VIN = 0dB
80
70
VIN = –20dB
60
50
40
30
VIN = –60dB
20
10
0
1k 10k 100k 1M 2M
INPUT FREQUENCY (Hz)
1416 G01
Spurious-Free Dynamic Range
vs Input Frequency
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
1k
10k 100k
INPUT FREQUENCY (Hz)
1M 2M
1416 G04
Integral Nonlinearity
vs Output Code
1.0
VOUT = ±2.5V
VREF = 2.5V
0.5
0
–0.5
–1.0
0
4096
8192 12288
OUTPUT CODE
16384
1416 G07
Signal-to-Noise Ratio
vs Input Frequency
90
80
70
60
50
40
30
20
10
0
1k 10k 100k
INPUT FREQUENCY (Hz)
1M 2M
1416 G02
Intermodulation Distortion Plot
0
fSAMPLE = 400kHz
–20
fa=87.01171876kHz
fb=113.1835938kHz
–40
–60
–80
–100
–120
–140
0 20 40 60 80 100 120 140 160 180 200
FREQUENCY (Hz)
1416 G05
Power Supply Feedthrough
vs Ripple Frequency
0
–10
–20
–30
–40
–50
–60
–70 DGND (VIN = 100mV)
–80 VSS (VIN = 10mV)
–90
VDD (VIN = 10mV)
–100
1k
10k 100k 1M 2M
RIPPLE FREQUENCY (Hz)
1416 G08
Distortion vs Input Frequency
0
–10
–20
–30
–40
–50
–60
–70
–80
–90 THD
3RD
–100
2ND
–110
1k
10k 100k
INPUT FREQUENCY (Hz)
1M 2M
1416 G03
Differential Nonlinearity
vs Output Code
1.0
VOUT = ±2.5V
VREF = 2.5V
0.5
0
–0.5
–1.0
0
4096
8192 12288
OUTPUT CODE
16384
1416 G06
Input Common Mode Rejection
vs Input Frequency
80
70
60
50
40
30
20
10
0
1k 10k 100k 1M 2M
INPUT FREQUENCY (Hz)
1416 G09
5
5 Page 
LTC1416
APPLICATIONS INFORMATION
Input Filtering
The noise and the distortion of the input amplifier and
other circuitry must be considered since they will add to
the LTC1416 noise and distortion. The small-signal band-
width of the sample-and-hold circuit is 15MHz. Any noise
or distortion products that are present at the analog inputs
will be summed over this entire bandwidth. Noisy input
circuitry should be filtered prior to the analog inputs to
minimize noise. A simple 1-pole RC filter is sufficient for
many applications. For example, Figure 7 shows a 1000pF
capacitor from AIN+ to ground and a 200Ω source resistor
to limit the input bandwidth to 800kHz. The 1000pF
capacitor also acts as a charge reservoir for the input
sample-and-hold and isolates the ADC input from sam-
pling glitch sensitive circuitry. High quality capacitors and
resistors should be used since these components can add
distortion. NPO and silver mica type dielectric capacitors
have excellent linearity. Carbon surface mount resistors
can also generate distortion from self-heating and from
damage that may occur during soldering. Metal film
surface mount resistors are much less susceptible to both
problems.
ANALOG 200Ω
INPUT
1 AIN+
1000pF
2 AIN–
3 LTC1416
VREF
22µF
4
REFCOMP
5
AGND
1416 F07
accommodate other input ranges often with little or no
additional circuitry. The following sections describe the
reference and input circuitry and how they affect the input
range.
Internal Reference
The LTC1416 has an on-chip, temperature compensated,
curvature corrected, bandgap reference that is factory
trimmed to 2.500V. It is connected internally to a reference
amplifier and is available at VREF (Pin 3). See Figure 8a. A
4k resistor is in series with the output so that it can be
easily overdriven by an external reference or other cir-
cuitry (see Figure 8b). The reference amplifier gains the
voltage at the VREF pin by 1.625 to create the required
internal reference voltage. This provides buffering be-
tween the VREF pin and the high speed capacitive DAC. The
3 VREF
2.5V
4.0625V 4 REFCOMP
22µF
5 AGND
REF
AMP
R2
80k
R3
128k
R1
4k BANDGAP
REFERENCE
LTC1416
1416 F08a
Figure 8a. LTC1416 Reference Circuit
Figure 7. RC Input Filter
Input Range
The ±2.5V input range of the LTC1416 is optimized for low
noise and low distortion. Most op amps also perform best
over this same range, allowing direct coupling to the
analog inputs and eliminating the need for special transla-
tion circuitry.
Some applications may require other input ranges. The
LTC1416 differential inputs and reference circuitry can
5V
VIN
LT1019A-2.5
VOUT
ANALOG
INPUT
22µF
1 AIN+
2 AIN–
3 LTC1416
VREF
4
REFCOMP
5
AGND
1416 F08b
Figure 8b. Using the LT1019-2.5 as an External Reference
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet LTC1416.PDF ] | |
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