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PDF ADS5220 Data sheet ( Hoja de datos )
| Número de pieza | ADS5220 | |
| Descripción | ANALOG-TO-DIGITAL CONVERTER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADS5220 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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ADS5220
ADS5220
SBAS261A – APRIL 2003 – REVISED MARCH 2004
12-Bit, 40MSPS Sampling, +3.3V
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q HIGH SNR: 70dB
q HIGH SFDR: 88dBFS
q LOW POWER: 195mW
q INTERNAL/EXTERNAL REFERENCE OPTION
q SINGLE-ENDED OR
FULLY DIFFERENTIAL ANALOG INPUT
q PROGRAMMABLE INPUT RANGE
q LOW DNL: 0.3LSB
q SINGLE +3.3V SUPPLY OPERATION
q TQFP-48 PACKAGE
APPLICATIONS
q WIRELESS LOCAL LOOP
q COMMUNICATIONS
q MEDICAL IMAGING
q PORTABLE INSTRUMENTATION
DESCRIPTION
The ADS5220 is a pipeline, CMOS Analog-to-Digital Con-
verter (ADC) that operates from a single +3.3V power
supply. This converter can be operated with a single-ended
input or differential input. The ADS5220 includes a 12-bit
quantizer, high bandwidth track-and-hold, and an internal
reference. It also allows the user to disable the internal
reference and utilize external references which provide ex-
cellent gain and offset matching when used in multi-channel
applications or in applications where full-scale range adjust-
ment is required.
The ADS5220 employs digital error correction techniques to
provide excellent differential linearity for demanding imag-
ing applications. Its low distortion and high SNR give the
extra margin needed for medical imaging, communications,
video, and test instrumentation. The ADS5220 offers power
dissipation of 195mW and also provides two power-down
modes.
The ADS5220 is specified at a maximum sampling fre-
quency of 40MSPS and a differential input range of
1V to 2V. The ADS5220 is available in a TQFP-48 package.
AVDD
ADS5220
CLK
Timing/Duty Cycle
Adjust
Circuitry
VDRV
IN
VIN
IN
S/H
12-Bit
Pipelined
ADC
Error
Correction
Logic
3-State
Output
D0
•••
D11
Internal
Reference
OVR
STPD QPD
REFT REFB
RSEL VREF
OE
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2003-2004, Texas Instruments Incorporated
1 page  
TIMING DIAGRAM
Analog In N
Clock
N+1
N+2
tD tCONV
N+3
N+4
tL tH
N+5
N+6
N+7
Data Out
5 Clock Cycles
N–5
N–4
Data Invalid
N–3
N–2
N–1
t2
N
t1
N+1
N+2
SYMBOL
DESCRIPTION
MIN TYP MAX UNITS
tCONV
Convert Clock Period
25
1µs ns
tL
Clock Pulse LOW
8.75 12.5
ns
tH
Clock Pulse HIGH
8.75 12.5
ns
tD Aperture Delay
3 ns
t1
Data Hold Time, CL = 0pF
3.9
ns
t2 New Data Delay Time, CL = 15pF max
12 ns
ADS5220
SBAS261A
www.ti.com
5
5 Page 
ANALOG INPUT DRIVEN BY TRANSFORMER
The ADS5220 can be driven by a transformer, which pro-
vides signal AC-coupling and allows a signal conversion from
single-ended input to differential output, or from single-ended
input to single-ended output. Using a transformer offers a
number of advantages. As a passive component, it does not
add to the total noise and has better harmonics in wide
frequency bands, compared to an op amp driver. By using a
step-up transformer, further signal amplification can be real-
ized; as a result, the signal swing from the source can be
reduced. For transformer selection, it is important to carefully
examine the application requirements and determine the
correct model, the desired impedance ratio, and frequency
characteristics. Furthermore, the appropriate model must
support the targeted distortion level and should not exhibit
any core saturation at full-scale voltage levels. A variety of
miniature RF transformers from different manufacturers (such
as Mini-Circuits, Coilcraft, or Trak) can be selected.
Figure 3 shows a transformer-coupled input configuration of
the ADS5220. The ADS5220 receives a differential AC signal
from the output of the transformer and common-mode volt-
age of +1.5V from the center tap. A source termination
resistor, RT , is required, which may be placed at the primary
or secondary side of the transformer to satisfy the termina-
tion requirements of the source impedance, RS. The circuit
also shows the use of an additional RC low-pass filter placed
in series with each converter input to attenuate some of the
wideband noise. The resistor values are typically in the range
of 10Ω to 50Ω, and capacitors are in the range of 10pF to
100pF for individual application requirements.
1:n
RS
RT
24.9Ω
24.9Ω
IN
22pF
ADS5220
IN
0.1µF
3.3V
1.7kΩ
1.5V 1.5kΩ
FIGURE 3. Transformer-Coupled Differential Input Configura-
tion of ADS5220.
ANALOG INPUT DRIVEN BY AMPLIFIER
The ADS5220 can be driven by an operational amplifier with
DC or AC signal coupling, as shown in Figure 4 and Figure
5. In Figure 4, the THS4503, a differential amplifier, is used
to convert a single-ended input into a differential output with
a gain of 2. The THS4503 provides an output common-mode
voltage set by VOCM pin, and is DC-coupled to the input of
ADS5220. A low-pass filter can be created by adding small
capacitors (for example, 10pF) in parallel with the feedback
resistors of the THS4503 as needed for some applications.
50Ω
Source
+5V 10pF(1)
187Ω
60.4Ω
0.1µF
VOCM
392Ω
24.9Ω
THS4503 24.9Ω
392Ω
3.3V
1.7kΩ
215Ω
–5V
1.5V 1.5kΩ
10pF(1)
IN
22pF
ADS5220
IN
NOTE: (1) optional.
FIGURE 4. Using the THS4503 Differential Amplifier (Gain = 2) to Drive the ADS5220 in a DC-Coupled Configuration.
ADS5220
SBAS261A
www.ti.com
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ADS5220.PDF ] | |
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