參數(shù)資料
型號(hào)： AD9280ARSRL
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 23/24頁(yè)
文件大?。?/td> 0K
描述： IC ADC 8BIT CMOS 32MSPS 28-SSOP
產(chǎn)品變化通告： AD9280 Pin Configuration Description Change 21/Apr/2010
Product Discontinuance 27/Oct/2011
標(biāo)準(zhǔn)包裝： 1,500
位數(shù)： 8
采樣率（每秒）： 32M
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 110mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 28-SSOP（0.209"，5.30mm 寬）
供應(yīng)商設(shè)備封裝： 28-SSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類(lèi)型： 1 個(gè)單端，單極
AD9280
–8–
Table I. Mode Selection
Input
MODE
REFSENSE
Modes
Connect
Span
Pin
REF
REFTS
REFBS
Figure
TOP/BOTTOM
AIN
1 V
AVDD
Short REFSENSE, REFTS and VREF Together
AGND
18
AIN
2 V
AVDD
AGND
Short REFTS and VREF Together
AGND
19
CENTER SPAN
AIN
1 V
AVDD/2
Short VREF and REFSENSE Together
AVDD/2
20
AIN
2 V
AVDD/2
AGND
No Connect
AVDD/2
Differential
AIN Is Input 1
1 V
AVDD/2
Short VREF and REFSENSE Together
AVDD/2
29
REFTS and
REFBS Are
Shorted Together
for Input 2
2 V
AVDD/2
AGND
No Connect
AVDD/2
External Ref
AIN
2 V max AVDD
AVDD
No Connect
Span = REFTS
21, 22
– REFBS (2 V max)
AGND
Short to
23
VREFTF
VREFBF
AD876-8
AIN
2 V
Float or
AVDD
No Connect
Short to
30
AVSS
VREFTF
VREFBF
0
–9
1.0E+6
1.0E+9
1.0E+7
SIGNAL
AMPLITUDE
–
dB
1.0E+8
–3
–6
FREQUENCY – Hz
–12
–15
–18
–21
–24
Figure 13. Full Power Bandwidth
50
40
–50
0
3.0
1.0
2.0
30
20
–10
–20
–30
INPUT VOLTAGE – V
10
0
–40
2.5
0.5
1.5
I B
–
A
REFBS = 0.5V
REFTS = 2.5V
CLOCK = 32MHz
Figure 14. Input Bias Current vs. Input Voltage
APPLYING THE AD9280
THEORY OF OPERATION
The AD9280 implements a pipelined multistage architecture to
achieve high sample rate with low power. The AD9280 distrib-
utes the conversion over several smaller A/D subblocks, refining
the conversion with progressively higher accuracy as it passes
the results from stage to stage. As a consequence of the distrib-
uted conversion, the AD9280 requires a small fraction of the
256 comparators used in a traditional flash type A/D. A sample-
and-hold function within each of the stages permits the first
stage to operate on a new input sample while the second, third
and fourth stages operate on the three preceding samples.
OPERATIONAL MODES
The AD9280 is designed to allow optimal performance in a
wide variety of imaging, communications and instrumentation
applications, including pin compatibility with the AD876-8 A/D.
To realize this flexibility, internal switches on the AD9280 are
used to reconfigure the circuit into different modes. These modes
are selected by appropriate pin strapping. There are three parts
of the circuit affected by this modality: the voltage reference, the
reference buffer, and the analog input. The nature of the appli-
cation will determine which mode is appropriate: the descrip-
tions in the following sections, as well as Table I should assist in
selecting the desired mode.
REV. E
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