Electronic Components Datasheet Search
  English  ▼

Delete All
ON OFF
ALLDATASHEET.COM

X  

Preview PDF Download HTML

ADS807 Datasheet(PDF) 12 Page - Texas Instruments

Part No. ADS807
Description  12-Bit, 53MHz Sampling ANALOG-TO-DIGITAL CONVERTER
Download  22 Pages
Scroll/Zoom Zoom In 100% Zoom Out
Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo 

ADS807 Datasheet(HTML) 12 Page - Texas Instruments

Zoom Inzoom in Zoom Outzoom out
 12 / 22 page
background image
ADS807
12
SBAS072A
www.ti.com
OPA642
V
IN
R
F
402
R
G
402
ADS807E
R
S
16.5
68pF
0.1µF
0.1
µF
IN
IN
CM
+5V
–5V
1.82k
Single-Ended, AC-Coupled, Dual-Supply Interface
The circuit provided in Figure 4 shows typical connections for
using the ADS807 in a single-ended input configuration. The
bias requirements for AC-coupling are provided by a single
resistor to the CM output lead. The single-ended mode of
operation should be considered for ease of interface com-
plexity and applications where the dynamic performance can
be compromised. The series resistor RS, along with the shunt
capacitance, provide the means to adjust the bandwidth and
optimize the performance towards good signal-to-noise ratio.
In addition, the amplifier configuration can be easily modified
for an anti-aliasing filter based on a 2nd-order Sallen-Key or
Multiple-Feedback topology.
The interface example shown in Figure 4 operates with the
full-scale range of the ADS807 set to 2Vp-p, leaving suffi-
cient headroom for the output of the OPA642 to drive the
converter and maintain low signal distortion.
DC-Coupled, Differential Driver with Level Shift
Several applications will require that the bandwidth of the
signal path include DC, in which case, the signal has to be
DC-coupled to the A/D converter. An op amp based interface
circuit can be configured to scale and level shift the input
signal to be compatible with the selected input range of the
A/D converter. The circuit shown in Figure 5 employs a dual
op amp, OPA2681, to drive the input of the ADS807 differ-
entially. The single-supply, general-purpose op amp OPA234
is added to buffer the common-mode voltage of +2.5V,
available at the CM pin, and apply it to the input of the driver
amplifier. This sets the correct DC voltage to bias the inputs
of the ADS807. It should be noted that any DC voltage
differences between the IN and IN inputs of the ADS807 will
result in an offset error.
Using the OPA2681, this circuit can be operated either with
a single or a dual
±5V supply.
FIGURE 4. AC-Coupling the Dual-Supply Amplifier OPA642 to the ADS807 for a 2Vp-p Full-Scale Input Range.
FIGURE 5. DC-Coupled Input Driver with Level Shifting.
V
IN
ADS807E
IN
IN
CM
499
249
24.9
24.9
249
OPA2681
0.1
µF
0.1
µF
0.1
µF
499
499
499
249
249
24.9
1k
22pF
22pF
OPA234


Html Pages

1  2  3  4  5  6  7  8  9  10  11  12  13  14  15  16  17  18  19  20  21  22 


Datasheet Download




Link URL




Privacy Policy
ALLDATASHEET.COM
Does ALLDATASHEET help your business so far?  [ DONATE ]  

About Alldatasheet   |   Advertisement   |   Datasheet Upload   |   Contact us   |   Privacy Policy   |   Alldatasheet API   |   Link Exchange   |   Manufacturer List
All Rights Reserved© Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn