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參數(shù)資料
| 型號(hào)： | EVAL-AD7934CB |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | ADC |
| 英文描述： | 4-Channel, 1.5 MSPS, 12-Bit and 10-Bit Parallel ADCs with a Sequencer |
| 中文描述： | 4通道，1.5 MSPS的12位和10位并行ADC的一個(gè)序列 |
| 文件頁數(shù)： | 23/32頁 |
| 文件大小： | 1253K |
| 代理商： | EVAL-AD7934CB |
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Preliminary Technical Data
AD7933/AD7934
REFERENCE
AD7933/
AD7934
ADC
BUFFER
0
V
REFIN
/
V
REFOUT
Example 2
V
IN MAX
=
V
DD
+ 0.3
V
IN MAX
=
V
REF
+
V
REF
/2
If
V
DD
= 3.6 V, then
V
IN MAX
= 3.9 V.
Figure 35. Internal Reference Circuit Block Diagram
Therefore, 3 ×
V
REF
/2 = 3.6 V.
Alternatively, an external reference can be applied to the
V
REFIN
/V
REFOUT
pin of the AD7933/AD7934. An external
reference input is selected by setting the REF bit in the internal
control register to 0. When using an external reference, the
V
REFIN
/V
REFOUT
pin should be decoupled to AGND with a 0.1 μF
capacitor. When operating in differential mode, the external
reference input range is 0.1 V to 3.5V, and in single-ended and
pseudo-differential mode, the external reference input range is
0.1 V to V
DD
. In all cases, the specified reference is 2.5 V.
V
REF
MAX
= 2.6 V
Therefore, when operating with at V
DD
= 3 V, the value of
V
REF
can range from 100 mV to a maximum value of 2.4 V. When
V
DD
= 2.7 V,
V
REF
MAX
= 2 V.
These examples show that the maximum reference applied to
the AD7933/AD7934 is directly dependant on the value applied
to V
DD
.
It is important to ensure that, when choosing the reference
value, the maximum analog input range (V
IN MAX
) is never
greater than V
DD
+ 0.3 V to comply with the maximum ratings
of the device. In pseudo differential mode, the user must ensure
that V
REFIN
V
IN
≤ V
DD
.
The performance of the part at different reference values is
shown in Figures TBD to TBD. The value of the reference sets
the analog input span and the common-mode voltage range.
Errors in the reference source result in gain errors in the
AD7933/AD7934 transfer function and add to the specified
full-scale errors on the part.
references available from ADI that could be used, and F
shows a typical connection diagram for an external reference.
Table 11. Examples of Suitable Voltage References
Output
Voltage
(% max)
AD780
2.5/3
0.04
ADR421
2.5
0.04
ADR420
2.048
0.05
lists suitable voltage
Table 11
The following two examples calculate the maximum V
REF
input
that can be used when operating the AD7933/AD7934 in
differential mode with a V
DD
of 5 V and 3 V, respectively.
igure 36
Figure 36. Typical V
REF
Connection Program
Example 1
Reference
Initial Accuracy
Operating
Current (μA)
1000
500
500
V
IN MAX
=
V
DD
+ 0.3
V
IN MAX
=
V
REF
+
V
REF
/2
0
1
AD780
NC
8
2
+V
IN
NC
7
3
GND
6
4
TEMP
5
O/PSELECT
TRIM
V
OUT
V
REF
2.5V
NC
NC
V
DD
NC = NO CONNECT
10nF
0.1
μ
F
0.1
μ
F
0.1
μ
F
*ADDITIONAL PINS OMITTED FOR CLARITY
AD7933/
AD7934*
If
V
DD
= 5 V, then
V
IN MAX
= 5.3 V.
Therefore, 3 ×
V
REF
/2 = 5.3 V.
V
REF
MAX
= 3.5 V
Therefore, when operating at V
DD
= 5 V, the value of
V
REF
can
range from 100 mV to a maximum value of 3.5 V. When V
DD
=
4.75 V,
V
REF
MAX
= 3.17 V.
Rev. PrG | Page 23 of 32
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