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AD7777AR Datenblatt(PDF) 11 Page - Analog Devices

Teilenummer AD7777AR
Bauteilbeschribung  LC2MOS, High Speed 1-, 4- & 8-Channel 10-Bit ADCs
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Hersteller  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7777AR Datenblatt(HTML) 11 Page - Analog Devices

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AD7776/AD7777/AD7778
–11–
REV. 0
RTN is tied to REFOUT then the analog input range becomes
0 V to 2 V. The fixed 2 V analog input voltage span of the ADC
can range from 1 V to 3 V (RTN = 0 V) to 0 V to 2 V (RTN =
2 V), i.e., with proper biasing, an input signal range from 0.3 V
to 2.3 V can be covered. Both the relative accuracy and differen-
tial nonlinearity performance remains essentially unchanged in
this mode while the SNR and THD performance are typically
2 dB to 3 dB worse than standard.
Changing the Analog Input Voltage Range
By biasing the RTN pin above AGND it is possible to change
the analog input voltage range from its VBIAS
± V
SWING format to
a more traditional 0 V to VREF range. The new input range can
be described as
VOFFSET to (VOFFSET + REFIN)
where 0 V
≤ V
OFFSET 1 V. To produce this range the RTN pin
must be biased to (REFIN – 2 VOFFSET). For instance if
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
R-24
24-Lead Wide-Body SOIC
PIN 1
0.299 (7.6)
0.291 (7.4)
13
12
1
24
0.419 (10.65)
0.394 (10.00)
0.013 (0.32)
0.009 (0.23)
0.005 (1.27)
0.015 (0.40)
0.614 (15.6)
0.598 (15.2)
0.104 (2.65)
0.093 (2.35)
0.012 (0.3)
0.004 (0.1)
0.019 (0.49)
0.014 (0.35)
0.050 (1.27)
BSC
R-28
28-Lead Wide-Body SOIC
PIN 1
0.299 (7.60)
0.291 (7.39)
15
14
1
28
0.414 (10.52)
0.398 (10.10)
0.03 (0.76)
0.02 (0.51)
0.013 (0.32)
0.009 (0.23)
0.042 (1.067)
0.018 (0.457)
0.708 (18.02)
0.696 (17.67)
0.096 (2.44)
0.089 (2.26)
0.01 (0.254)
0.006 (0.15)
0.019 (0.49)
0.014 (0.35)
0.050 (1.27)
BSC
1. LEAD NO. 1 IDENTIFIED BY A DOT.
2. SOIC LEADS WILL BE EITHER TIN PLATED OF SOLDER DIPPED
IN ACCORDANCE WITH MIL-M-38510 REQUIREMENTS.


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