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參數(shù)資料
| 型號： | EVAL-AD7357EDZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/21頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD7357 |
| 標準包裝： | 1 |
| ADC 的數(shù)量： | 2 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 4.2M |
| 數(shù)據(jù)接口： | 串行 |
| 輸入范圍： | ±VREF/2 |
| 在以下條件下的電源（標準）： | 36mW @ 4.2MSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7357 |
| 已供物品： | 板，CD |
AD7357
Rev. B | Page 14 of 20
07
75
7-
1
33
GND
2 × VREF p-p
27
V+
V–
V+
V–
1.024V
2.048V
0V
1.024V
2.048V
0V
REFA/REFB
VIN+
AD7357*
VIN–
220
10F
*ADDITIONAL PINS OMITTED FOR CLARITY.
220
20k
A
440
10k
220
If the analog inputs source being used has zero impedance, all
four resistors (RG1, RG2, RF1, and RF2) should be the same. If
the source has a 50 Ω impedance and a 50 Ω termination, for
example, the value of RG2 should be increased by 25 Ω to
balance this parallel impedance on the input and thus ensure
that both the positive and negative analog inputs have the
same gain. The outputs of the amplifier are perfectly matched
balanced differential outputs of identical amplitude and are
exactly 180° out of phase.
+2.048V
GND
–2.048V
AD8138
RG1
RS*
RG2
RF2
VOCM
RF1
2.048V
VIN+
VIN–
1.024V
0V
2.048V
1.024V
0V
AD7357
CF2
CF1
10k
10F
REFA/REFB
*MOUNT AS CLOSE TO THE AD7357 AS POSSIBLE
AND ENSURE THAT HIGH PRECISION RS RESISTORS ARE USED.
RS – 33; RG1 = RF1 = RF2 = 499; CF1 = CF2 = 39pF;
RG2 = 523
51
0
77
57-
13
1
Figure 22. Dual Op Amp Circuit to Convert a Single-Ended Bipolar Signal into
a Differential Unipolar Signal
VOLTAGE REFERENCE
The AD7357 allows the choice of a very low temperature drift
internal voltage reference or an external reference. The internal
2.048 V reference of the AD7357 provides excellent perfor-
mance and can be used in almost all applications. When the
internal reference is used, the reference voltage is present on
the REFA and REFB pins. These pins should be decoupled to
REFGND with 10 μF capacitors. The internal reference voltage
can be used elsewhere in the system, provided it is buffered
externally.
Figure 20. Using the AD8138 as a Single-Ended-to-Differential Amplifier
The REFA and REFB pins can also be overdriven with an
external voltage reference if desired. The applied reference
voltage can range from 2.048 V + 100 mV to VDD. A common
choice would be to use an external 2.5 V reference such as the
Op Amp Pair
An op amp pair can be used to directly couple a differential signal
to one of the analog input pairs of the AD7357. The circuit
an op amp pair can be used to convert a single-ended signal
into a differential signal for a bipolar and unipolar input
signal, respectively. The voltage applied to Point A sets up
the common-mode voltage. In both diagrams, Point A is
connected in some way to the reference. The AD8022 is a
suitable dual op amp that can be used in this configuration
to provide differential drive to the AD7357.
ADC TRANSFER FUNCTION
The output coding for the AD7357 is straight binary. The
designed code transitions occur at successive LSB values (such
as, 1 LSB, 2 LSBs). The LSB size is (2 × VREF)/16,384. The ideal
transfer characteristic of the AD7357 is shown in Figure 23.
0
775
7-
1
32
GND
VREF p-p
27
V+
V–
V+
V–
1.024V
2.048V
0V
1.024V
2.048V
0V
REFA/REFB
VIN+
AD7357*
VIN–
220
10F
*ADDITIONAL PINS OMITTED FOR CLARITY.
220
10k
A
220
VREF
2
000 ... 000
000 ... 001
000 ... 010
111 ... 101
111 ... 110
111 ... 111
ADC
CO
DE
ANALOG INPUT
–VREF + 0.5 LSB
–VREF + 1 LSB
+VREF – 1.5 LSB
+VREF – 1 LSB
07
75
7-
0
23
Figure 21. Dual Op Amp Circuit to Convert a Single-Ended Unipolar Signal
into a Differential Signal
Figure 23. Deal Transfer Characteristic
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