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參數資料
| 型號： | EVAL-AD7723CBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數： | 15/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7723 |
| 標準包裝： | 1 |
| ADC 的數量： | 1 |
| 位數： | 16 |
| 采樣率（每秒）： | 1.2M |
| 數據接口： | 串行，并聯 |
| 輸入范圍： | ±VREF |
| 在以下條件下的電源（標準）： | 475mW @ 1.2MSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD7723 |
| 已供物品： | 板，CD |
| 相關產品： | AD7723BSZ-REEL-ND - IC ADC 16BIT SIGMA-DELTA 44MQFP AD7723BSZ-ND - IC ADC 16BIT SIGMA-DELTA 44MQFP |
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AD7723
Rev. C | Page 22 of 32
1M
XTAL
CLKIN
AD7723
01186-043
In all cases, since the REF2 voltage connects to the analog
modulator, a 220 nF and 10 nF capacitor must connect directly
from REF2 to AGND. The external capacitor provides the
charge required for the dynamic load presented at the REF2 pin
(see Figure 41).
10nF
220nF
A
B
A
4pF
REF2
SWITCHED-CAP
DAC REFERENCED
CLKIN
A
B
A
B
Φ
ΦΦ
Φ
01186-041
23
Figure 43. Crystal Oscillator Connection
When an external clock source is being used, the internal
oscillator circuit can be disabled by tying XTAL_OFF high. A
low phase noise clock should be used to generate the ADC
sampling clock because sampling clock jitter effectively
modulates the input signal and raises the noise floor. The
sampling clock generator should be isolated from noisy digital
circuits, grounded, and heavily decoupled to the analog ground
plane.
Figure 41. REF2 Equivalent Input Circuit
The AD780 is ideal to use as an external reference with the
AD7723. Figure 42 shows a suggested connection diagram.
Grounding Pin 8 on the AD780 selects the 3 V output mode.
The sampling clock generator should be referenced to the
analog ground in a split ground system. However, this is not
always possible because of system constraints. In many
applications, the sampling clock must be derived from a higher
frequency multipurpose system clock that is generated on the
digital ground plane. If the clock signal is passed between its
origin on a digital ground plane to the AD7723 on the analog
ground plane, the ground noise between the two planes adds
directly to the clock and produces excess jitter. The jitter can
cause degradation in the signal-to-noise ratio and also produce
unwanted harmonics. This can be remedied somewhat by
transmitting the sampling signal as a differential one, using
either a small RF transformer or a high speed differential driver
and a receiver such as PECL. In either case, the original master
system clock should be generated from a low phase noise crystal
oscillator.
1
2
3
4
AD780
AD7723
REF2
REF1
5V
1
F
22nF
220nF
10nF
22
F
NC
+VIN
TEMP
GND
O/P
SELECT
NC
VOUT
TRIM
2.5V
NC = NO CONNECT
8
7
6
5
01186-042
Figure 42. External Reference Circuit Connection
CLOCK GENERATION
The AD7723 contains an oscillator circuit to allow a crystal or
an external clock signal to generate the master clock for the
ADC. The connection diagram for use with a crystal is shown
in Figure 43. Consult the manufacturer’s recommendation for
the load capacitors. To enable the oscillator circuit on board the
AD7723, XTAL_OFF should be tied low.
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