AD7776 Просмотр технического описания (PDF) - Analog Devices
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AD7776 Datasheet PDF : 12 Pages
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AD7776/AD7777/AD7778
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 ± VSWING 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 ≤ VOFFSET ≤ 1 V. To produce this range, the RTN pin
must be biased to (REFIN – 2 VOFFSET). For instance, if
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 remain essentially unchanged in
this mode, while the SNR and THD performance are typically
2 dB to 3 dB worse than standard.
OUTLINE DIMENSIONS
24-Lead Standard Small Outline Package [SOIC]
Wide Body
(RW-24)
Dimensions shown in millimeters and (inches)
15.60 (0.6142)
15.20 (0.5984)
24
1
13
7.60 (0.2992)
7.40 (0.2913)
10.65 (0.4193)
12
10.00 (0.3937)
0.30 (0.0118)
0.10 (0.0039)
1.27 (0.0500)
COPLANARITY
BSC
0.10
0.51 (0.020)
0.33 (0.013)
2.65 (0.1043)
2.35 (0.0925)
0.75
0.25
(0.0295)
(0.0098)
؋
45؇
8؇
SEATING
PLANE
0.32 (0.0126)
0؇
0.23 (0.0091)
1.27 (0.0500)
0.40 (0.0157)
COMPLIANT TO JEDEC STANDARDS MS-013AD
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
28-Lead Standard Small Outline Package [SOIC]
Wide Body
(RW-28)
Dimensions shown in millimeters and (inches)
18.10 (0.7126)
17.70 (0.6969)
28
15
7.60 (0.2992)
7.40 (0.2913)
10.65 (0.4193)
1
14
10.00 (0.3937)
0.30 (0.0118)
0.10 (0.0039)
COPLANARITY
0.10
2.65 (0.1043)
2.35 (0.0925)
0.75 (0.0295)
0.25 (0.0098)
؋ 45؇
8؇
1.27 (0.0500)
BSC
0.51 (0.0201)
0.33 (0.0130)
SEATING
PLANE
0.32
(0.0126)
0.23 (0.0091)
0؇
1.27 (0.0500)
0.40 (0.0157)
COMPLIANT TO JEDEC STANDARDS MS-013AE
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN
REV. A
–11–
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