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PDF LTC1743 Data sheet ( Hoja de datos )
| Número de pieza | LTC1743 | |
| Descripción | 12-Bit 50Msps ADC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC1743 (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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FEATURES
s Sample Rate: 50Msps
s 72.5dB SNR and 85dB SFDR (3.2V Range)
s 71dB SNR and 90dB SFDR (2V Range)
s No Missing Codes
s Single 5V Supply
s Power Dissipation: 1000mW
s Selectable Input Ranges: ±1V or ±1.6V
s 150MHz Full Power Bandwidth S/H
s Pin Compatible Family
25Msps: LTC1746 (14-Bit), LTC1745 (12-Bit)
50Msps: LTC1744 (14-Bit), LTC1743 (12-Bit)
65Msps: LTC1742 (14-Bit), LTC1741 (12-Bit)
80Msps: LTC1748 (14-Bit), LTC1747 (12-Bit)
s 48-Pin TSSOP Package
U
APPLICATIO S
s Telecommunications
s Receivers
s Cellular Base Stations
s Spectrum Analysis
s Imaging Systems
, LTC and LT are registered trademarks of Linear Technology Corporation.
LTC1743www.DataSheet4U.com
12-Bit, 50Msps ADC
DESCRIPTIO
The LTC®1743 is a 50Msps, sampling 12-bit A/D con-
verter designed for digitizing high frequency, wide
dynamic range signals. Pin selectable input ranges of ±1V
and ±1.6V along with a resistor programmable mode
allow the LTC1743’s input range to be optimized for a
wide variety of applications.
The LTC1743 is perfect for demanding communications
applications with AC performance that includes 72.5dB
SNR and 85dB spurious free dynamic range. Ultralow jitter
of 0.3psRMS allows undersampling of IF frequencies with
excellent noise performance. DC specs include ±1LSB
maximum INL and ±0.8LSB DNL over temperature.
The digital interface is compatible with 5V, 3V and 2V logic
systems. The ENC and ENC inputs may be driven differen-
tially from PECL, GTL and other low swing logic families or
from single-ended TTL or CMOS. The low noise, high gain
ENC and ENC inputs may also be driven by a sinusoidal
signal without degrading performance. A separate output
power supply can be operated from 0.5V to 5V, making it
easy to connect directly to any low voltage DSPs or FIFOs.
The 48-pin TSSOP package with a flow-through pinout
simplifies the board layout.
BLOCK DIAGRA
AIN+
±1V
DIFFERENTIAL
ANALOG INPUT AIN–
SENSE
VCM
4.7µF
RANGE
SELECT
2.5VREF
50Msps, 12-Bit ADC with a 2V Differential Input Range
OVDD
0.1µF
0.5V TO 5V
0.1µF
S/H 12-BIT
AMP PIPELINED ADC
BUFFER
DIFF AMP
12
OUTPUT
LATCHES
OF
•••
D11
D0
CLKOUT
OGND
CONTROL LOGIC
VDD
5V
1µF 1µF 1µF
GND
REFLB
0.1µF
1µF
REFHA
4.7µF
REFLA REFHB ENC ENC MSBINV
0.1µF DIFFERENTIAL
1µF ENCODE INPUT
1743 BD
OE
1743f
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1 page  
LTC1743www.DataSheet4U.com
TYPICAL PERFOR A CE CHARACTERISTICS
Typical INL
1.00
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
0
1024
2048
CODE
3072
4096
1743 G01
Nonaveraged, 8192 Point FFT,
Input Frequency = 20MHz, –1dB
2V Range
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20
FREQUENCY (MHz)
25
1743 G04
Averaged, 8192 Point 2-Tone
FFT, Input Frequency = 2.5MHz
and 5.2MHz, 2V Range
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20
FREQUENCY (MHz)
25
1743 G07
Typical DNL
1.00
0.75
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
0
1024
2048
CODE
3072
4096
1743 G02
Nonaveraged, 8192 Point FFT,
Input Frequency = 2.5MHz, –1dB
3.2V Range
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20
FREQUENCY (MHz)
25
1743 G05
Averaged, 8192 Point 2-Tone
FFT, Input Frequency = 2.5MHz
and 5.2MHz, 3.2V Range
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20
FREQUENCY (MHz)
25
1743 G08
Nonaveraged, 8192 Point FFT,
Input Frequency = 2.5MHz, –1dB
2V Range
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20
FREQUENCY (MHz)
25
1743 G03
Nonaveraged, 8192 Point FFT,
Input Frequency = 20MHz, –1dB
3.2V Range
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20
FREQUENCY (MHz)
25
1743 G06
Averaged, 8192 Point FFT, Input
Frequency = 2.5MHz, –6dB,
2V Range
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
5 10 15 20
FREQUENCY (MHz)
25
1743 G09
1743f
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5 Page 
LTC1743www.DataSheet4U.com
APPLICATIO S I FOR ATIO
DYNAMIC PERFORMANCE
Signal-to-Noise Plus Distortion Ratio
The signal-to-noise plus distortion ratio [S / (N + D)] is the
ratio between the RMS amplitude of the fundamental input
frequency and the RMS amplitude of all other frequency
components at the ADC output. The output is band limited
to frequencies above DC to below half the sampling
frequency.
Signal-to-Noise Ratio
The signal-to-noise ratio (SNR) is the ratio between the
RMS amplitude of the fundamental input frequency and
the RMS amplitude of all other frequency components
except the first five harmonics and DC.
Total Harmonic Distortion
Total harmonic distortion 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 band
between DC and half the sampling frequency. THD is
expressed as:
THD = 20Log V22 + V32 + V42 + LVn2
V1
where V1 is the RMS amplitude of the fundamental fre-
quency and V2 through Vn are the amplitudes of the
second through nth harmonics. The THD calculated in this
data sheet uses all the harmonics up to the fifth.
Intermodulation Distortion
If the ADC input signal consists of more than one spectral
component, the ADC transfer function nonlinearity can
produce intermodulation distortion (IMD) in addition to
THD. IMD is the change in one sinusoidal input caused by
the presence of another sinusoidal input at a different
frequency.
If two pure sine waves of frequencies fa and fb are applied
to the ADC input, nonlinearities in the ADC transfer func-
tion can create distortion products at the sum and differ-
ence frequencies of mfa ± nfb, where m and n = 0, 1, 2, 3,
etc. The 3rd order intermodulation products are 2fa + fb,
2fb + fa, 2fa – fb and 2fb – fa. The intermodulation
distortion is defined as the ratio of the RMS value of either
input tone to the RMS value of the largest 3rd order
intermodulation product.
Spurious Free Dynamic Range (SFDR)
Spurious free dynamic range is the peak harmonic or
spurious noise that is the largest spectral component
excluding the input signal and DC. This value is expressed
in decibels relative to the RMS value of a full scale input
signal.
Input Bandwidth
The input bandwidth is that input frequency at which the
amplitude of the reconstructed fundamental is reduced by
3dB for a full scale input signal.
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11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet LTC1743.PDF ] | |
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