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PDF LTC1411 Data sheet ( Hoja de datos )
| Número de pieza | LTC1411 | |
| Descripción | Single Supply 14-Bit 2.5Msps ADC | |
| Fabricantes | Linear | |
| Logotipo |  |
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FEATURES
s Sample Rate: 2.5Msps
s 80dB S/(N + D) and 90dB THD at 100kHz fIN
s Single 5V Operation
s No Pipeline Delay
s Programmable Input Ranges
s Low Power Dissipation: 195mW (Typ)
s True Differential Inputs Reject Common Mode Noise
s Out-of-Range Indicator
s Internal or External Reference
s Sleep (1µA) and Nap (2mA) Shutdown Modes
s 36-Pin SSOP Package
U
APPLICATIO S
s Telecommunications
s High Speed Data Acquisition
s Digital Signal Processing
s Multiplexed Data Acquisition Systems
s Spectrum Analysis
s Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1411
Single Supply
14-Bit 2.5Msps ADC
DESCRIPTIO
The LTC ®1411 is a 2.5Msps sampling 14-bit A/D con-
verter in a 36-pin SSOP package, which typically dissi-
pates only 195mW from a single 5V supply. This device
comes complete with a high bandwidth sample-and-
hold, a precision reference, programmable input ranges
and an internally trimmed clock. The ADC can be powered
down with either the Nap or Sleep mode for low power
applications.
The LTC1411 converts either differential or single-ended
inputs and presents data in 2’s complement format.
Maximum DC specs include ±2LSB INL and 14-bit no
missing code over temperature. Outstanding dynamic
performance includes 80dB S/(N + D) and 90dB THD at
100kHz input frequency.
The LTC1411 has four programmable input ranges se-
lected by two digital input pins, PGA0 and PGA1. This
provides input spans of ±1.8V, ±1.27V, ±0.9V and ±0.64V.
An out-of-the-range signal together with the D13 (MSB)
will indicate whether a signal is over or under the ADC’s
input range. A simple conversion start input and a data
ready signal ease connections to FIFOs, DSPs and micro-
processors.
BLOCK DIAGRA
1 AIN+
2 AIN–
REFOUT
3
REFIN
4
2.5V
BANDGAP
REFERENCE
5k
5k 2k
REFCOM1
5
REFCOM2
6
X1.62/
X1.15
10 30
AVP DVP
+
14-BIT
– ADC
INTERNAL
CLOCK
14
OUTPUT
DRIVERS
CONTROL LOGIC
OVDD
29
OGND 28
D13
12
•
•
•
D0 25
BUSY
27
OTR
26
7, 8, 9
AGND
AVM SLP NAP PGA0 PGA1 CONVST DGND
11 36 35 34 33 32
31
1411 BD
S/(N + D) and Effective Bits
vs Input Frequency
86 14
80 13
74 12
68 11
62 10
56
50
44
38
32
26
20
14
10
100
1000
10000
INPUT FREQUENCY (kHz)
1411 TA02
1411f
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LTC1411
Spurious Free Dynamic Range
vs Input Frequency
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
10
100 1000
INPUT FREQUENCY (kHz)
10000
1411 G04
S/(N + D) vs Input Frequency
and Amplitude
86
80 0dB
74
68
62 –20dB
56
50
44 –40dB
38
32
26
20
14
10
100 1000
INPUT FREQUENCY (kHz)
10000
1411 G05
Integral Nonlinearity
vs Output Code
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
4096
8192 12288
OUTPUT CODE
16384
1411 G07
Differential Nonlinearity
vs Output Code
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
0
4096
8192 12288
OUTPUT CODE
16384
1411 G08
Supply Current vs Temperature
45
VDD = 5V
44
43
42
41
40
39
38
37
36
35
–50 –25 0 25 50 75 100
TEMPERATURE (°C)
1411 G11
Supply Current vs Supply Voltage
46.5
TA = 25°C
44.0
41.5
39.0
36.5
34.0
31.5
4.5
4.75
5.0
VDD (V)
5.25 5.5
1411 G12
Histogram for 4096 Conversions
3500
3000
2500
4096 Points FFT Plot (100kHz)
0
SINAD = 78.8dB
–20
SFDR = 95dB
fSAMPLE = 2.5MHz
fIN = 100kHz
–40
2000
–60
1500
–80
1000
–100
500 –120
0
–1
0
CODE
1
1411 G13
–140
0
250 500 750 1000 1250
INPUT FREQUENCY (kHz)
1411 G14
1411f
5
5 Page 
LTC1411
APPLICATIO S I FOR ATIO
LT6203: Dual 100MHz, Low Noise, Low Power Op Amp.
Specified at 3V, 5V and ±5V supplies. 1.9nV/√Hz noise
voltage.
Programmable Input Range
The LTC1411 has two logic input pins (PGA0 and PGA1)
that are used to select one of four analog input ranges.
These input ranges are set by changing the reference
voltage that is applied to the internal DAC of the ADC
(REFCOM2). For the “0dB” setting the internal DAC sees
the full reference voltage of 4V. The analog input range is
0.7V to 4.3V with AIN– = 2.5V. This corresponds to an input
span of ±1.8V with respect to the voltage applied to AIN–
. For the “– 3dB” setting the internal reference is reduced
to 0.707 • 4V = 2.9V. Likewise the input span is reduced
to ±1.28V. The following table lists the input span with
respect to AIN– for the different PGA0 and PGA1 settings.
Table 1. Input Spans for LTC1411
PGA0
PGA1
LEVEL
INPUT
SPAN
REFCOM2
VOLTAGE
5V 5V 0dB ±1.8V 4V
5V
0V
– 3dB
± 1.28V
2.9V
0V
5V
– 6dB
±0.9V
2V
0V
0V
– 9dB
± 0.64V
1.45V
When changing from one input span to another, more time
is needed for the REFCOM2 pin to reach the correct level
because the bypass capacitor on the pin needs to be charged
or discharged. Figure 6 shows the recommended capaci-
tors at the REFCOM1 and REFCOM2 pins (10µF each).
When – 6dB or – 9dB is selected, the voltage at REFCOM1
(see Figure 2) must first settle before REFCOM2 reaches
the correct level. The typical delay is about 700ms.
When the REFCOM2 level is changed from 2.9V to 4V
(changing PGA setting from – 3dB to 0dB), the typical delay
is 0.6ms. However, if the voltage at REFCOM2 is changed
from 4V to 2.9V (changing PGA setting from 0dB to – 3dB)
only a 60µA sink current is present to discharge the 10µF
bypass capacitor. In this case, the delay will be 11ms.
Internal Reference
The LTC1411 has an on-chip, temperature compensated,
curvature corrected, bandgap reference that is factory
trimmed to 2.500V. If this REFOUT pin is used to drive the
AIN– pin, a 22µF tantalum bypass capacitor is required and
this REFOUT voltage sets the bipolar zero for the ADC.
The REFIN pin is connected to the reference buffer through
a 2k resistor and two PGA switches. The REFIN pin can be
connected to REFOUT directly or to an external reference.
Figure 6 shows the reference and buffer structure for the
LTC1411. The input to the reference buffer is either REFIN
or 1/2 of REFIN depending on the PGA selection. The
REFCOM1 pin bypassed with a 10µF tantalum capacitor
helps reduce the noise going into the buffer. The reference
buffer has a gain of 1.62 or 1.15 (depends on PGA
selection). It is compensated at the REFCOM2 pin with a
10µF tantalum capacitor. The input span of the ADC is set
by the output voltage of this REFCOM2 voltage. For a 2.5V
input at the REFIN pin, the REFCOM2 will have 4V output
for PGA1 = PGA0 = 5V and the ADC will have a span of 3.6V.
REFOUT
22µF**
2.5V
BANDGAP
REFERENCE
REFIN*
5k
REFCOM1
5k
2k
10µF
REFCOM2
X1.62
10µF
1411 F06
*THIS PIN CAN BE TIED TO REFOUT OR AN EXTERNAL SOURCE
**A 22µF CAPACITOR IS NEEDED IF REFOUT IS USED TO DRIVE AIN–
Figure 6. Reference Structure for the LTC1411
for PGA1 = PGA0 = 5V
1411f
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1411.PDF ] | |
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