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参数资料
| 型号： | EVAL-AD7764EDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 21/33页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL AD7764 |
| 标准包装： | 1 |
| ADC 的数量： | 1 |
| 位数： | 24 |
| 采样率（每秒）： | 312k |
| 数据接口： | 串行 |
| 输入范围： | ±3.2768 V |
| 在以下条件下的电源（标准）： | 300mW @ 312kSPS |
| 工作温度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7764 |
| 已供物品： | 板，CD |
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AD7764
Rev. A | Page 27 of 32
DECOUPLING AND LAYOUT INFORMATION
SUPPLY DECOUPLING
The decoupling of the supplies applied to the AD7764 is
important in achieving maximum performance. Each supply
pin must be decoupled to the correct ground pin with a 100 nF,
0603 case size capacitor.
Pay particular attention to decoupling Pin 7 (AVDD2) directly to
the nearest ground pin (Pin 8). The digital ground pin AGND2
(Pin 20) is routed directly to ground. Also, connect REFGND
(Pin 26) directly to ground.
The DVDD (Pin 17) and AVDD3 (Pin 28) supplies should be
decoupled to the ground plane at a point away from the device.
It is advised to decouple the supplies that are connected to the
following supply pins through 0603 size, 100 nF capacitors to a
star ground point linked to Pin 23 (AGND1):
VREF+ (Pin 27)
AVDD4 (Pin 25)
AVDD1 (Pin 24)
AVDD2 (Pin 21)
A layout decoupling scheme for these supplies, which connect
to the right side of the AD7764, is shown in Figure 51. Note the
star-point ground created at Pin 23.
06518-
133
AVDD2 (PIN 21)
VREF+ (PIN 27)
GND
PIN 23
STAR-POINT
GND
AVDD4
(PIN 25)
AVDD3 (PIN 28)
VIA TO GND
FROM PIN 20
AVDD1 (PIN 24)
GND
PIN 15
Figure 51. Supply Decoupling
REFERENCE VOLTAGE FILTERING
A low noise reference source, such as the ADR444 or ADR434
(4.096 V), is suitable for use with the AD7764. The reference
voltage supplied to the AD7764 should be decoupled and
filtered as shown in Figure 52.
The recommended scheme for the reference voltage supply is a
200 Ω series resistor connected to a 100 μF tantalum capacitor,
followed by a 10 nF decoupling capacitor very close to the
VREF+ pin.
06518-
134
7.5V
VOUT
2
VIN
6
4
10F
100nF
+
100nF
+
ADR444
GND
VREF+
PIN 27
100F
200
Figure 52. Reference Connection
DIFFERENTIAL AMPLIFIER COMPONENTS
The components recommended for use around the on-chip
differential amplifier are detailed in Table 7. Matching the
components on both sides of the differential amplifier is
important to minimize distortion of the signal applied to the
amplifier. A tolerance of 0.1% or better is required for these
components. Symmetrical routing of the tracks on both sides
of the differential amplifier also assists in achieving stated
performance. Figure 53 shows a typical layout for the com-
ponents around the differential amplifier. Note that the traces
for both differential paths are made as symmetrical as possible
and that the feedback resistors and capacitors are placed on the
underside of the PCB to enable the simplest routing.
06518-
135
RFB
CFB
RIN
VINA–
VINA+
Figure 53. Typical Layout Structure for Surrounding Components
LAYOUT CONSIDERATIONS
Whereas using the correct components is essential to achieve
optimum performance, the correct layout is equally as
important. The AD7764 product page on www.analog.com
contains the Gerber files for the AD7764 evaluation board. The
Gerber files should be used as a reference when designing any
system using the AD7764.
The use of ground planes should be carefully considered. To
ensure that the return currents through the decoupling
capacitors are flowing to the correct ground pin, the ground
side of the capacitors should be as close to the ground pin
associated with that supply, as recommended in the Supply
Decoupling section.
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