參數(shù)資料
型號： AD9221AR
廠商： Analog Devices Inc
文件頁數(shù)： 11/32頁
文件大?。?/td> 0K
描述： IC ADC 12BIT 1.5MSPS 28-SOIC
標(biāo)準(zhǔn)包裝： 27
位數(shù)： 12
采樣率（每秒）： 1.5M
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 7
功率耗散（最大）： 70mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC W
包裝： 管件
輸入數(shù)目和類型： 2 個(gè)單端，單極；1 個(gè)差分，單極
REV. E
AD9221/AD9223/AD9220
–19–
Shorting the VREF pin directly to the SENSE pin places the
internal reference amplifier in unity-gain mode and the resultant
VREF output is 1 V. Therefore, the valid input range is 0 V to 2 V.
However, shorting the SENSE pin directly to the REFCOM pin
configures the internal reference amplifier for a gain of 2.5 and
the resultant VREF output is 2.5 V. Thus, the valid input range
becomes 0 V to 5 V. The VREF pin should be bypassed to the
REFCOM pin with a 10
F tantalum capacitor in parallel with a
low inductance 0.1
F ceramic capacitor.
10 F
VINA
VREF
0.1 F
VINB
2 VREF
0V
SHORT FOR 0V TO 2V
INPUT SPAN
SENSE
SHORT FOR 0V TO 5V
INPUT SPAN
REFCOM
AD9221/
AD9223/
AD9220
Figure 21. Internal Reference—2 V p-p Input Span,
VCM = 1 V, or 5 V p-p Input Span, VCM = 2.5 V
Single-Ended or Differential Input, VCM = 2.5 V
Figure 22 shows the single-ended configuration that gives the best
dynamic performance (SINAD, SFDR). To optimize dynamic
specifications, center the common-mode voltage of the analog
input at approximately by 2.5 V by connecting VINB to a low
impedance 2.5 V source. As described above, shorting the VREF
pin directly to the SENSE pin results in a 1 V reference voltage
and a 2 V p-p input span. The valid range for input signals is 1.5 V
to 3.5 V. The VREF pin should be bypassed to the REFCOM
pin with a 10
F tantalum capacitor in parallel with a low induc-
tance 0.1
F ceramic capacitor.
This reference configuration could also be used for a differential
input in which VINA and VINB are driven via a transformer as
shown in Figure 19. In this case, the common-mode voltage,
VCM, is set at midsupply by connecting the transformer’s center
tap to CML of the AD9221/AD9223/AD9220. VREF can be
configured for 1 V or 2.5 V by connecting SENSE to either VREF
or REFCOM respectively. Note that the valid input range for
each of the differential inputs is one-half of single-ended input
and thus becomes VCM – VREF/2 to VCM + VREF/2.
1V
0.1 F
10 F
VINA
VINB
VREF
SENSE
REFCOM
3.5V
1.5V
2.5V
AD9221/
AD9223/
AD9220
Figure 22. Internal Reference—2 V p-p Input Span,
VCM = 2.5 V
Resistor Programmable Reference
Figure 23 shows an example of how to generate a reference
voltage other than 1 V or 2.5 V with the addition of two external
resistors and a bypass capacitor. Use the equation,
VREF
V
R
=× +
()
11
1
2
/
to determine appropriate values for R1 and R2. These resistors
should be in the 2 k
to 100 k range. For the example shown,
R1 equals 2.5 k
and R2 equals 5 k. From the equation above,
the resultant reference voltage on the VREF pin is 1.5 V. This
sets the input span to be 3 V p-p. To assure stability, place a
0.1
F ceramic capacitor in parallel with R1.
The common-mode voltage can be set to VREF by connecting
VINB to VREF to provide an input span of 0 to 2
× VREF.
Alternatively, the common-mode voltage can be set to VREF by
connecting VINB to a low impedance 2.5 V source. For the
example shown, the valid input single range for VINA is 1 V to
4 V since VINB is set to an external, low impedance 2.5 V source.
The VREF pin should be bypassed to the REFCOM pin with a
10
F tantalum capacitor in parallel with a low inductance
0.1
F ceramic capacitor.
1.5V
C1
0.1 F
10 F
VINA
VINB
VREF
SENSE
REFCOM
AD9220
4V
1V
2.5V
R1
2.5k
R2
5k
0.1 F
Figure 23. Resistor Programmable Reference—3 V p-p
Input Span, VCM = 2.5 V
USING AN EXTERNAL REFERENCE
Using an external reference may enhance the dc performance of
the AD9221/AD9223/AD9220 by improving drift and accuracy.
Figures 24 through 26 show examples of how to use an external
reference with the A/D. Table III is a list of suitable voltage
references from Analog Devices. To use an external reference,
the user must disable the internal reference amplifier and drive
the VREF pin. Connecting the SENSE pin to AVDD disables
the internal reference amplifier.
Table III. Suitable Voltage References
Initial
Operating
Output
Drift
Accuracy
Current
Voltage
(ppm/ C)
% (max)
( A)
Internal
1.00
26
1.4
N/A
AD589
1.235
10–100
1.2–2.8
50
AD1580
1.225
50–100
0.08–0.8
50
REF191
2.048
5–25
0.1–0.5
45
Internal
2.50
26
1.4
N/A
REF192
2.50
5–25
0.08–0.4
45
REF43
2.50
10–25
0.06–0.1
600
AD780
2.50
3–7
0.04–0.2
1000
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