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參數(shù)資料
| 型號： | AD9627-125EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 25/76頁 |
| 文件大小： | 0K |
| 描述： | IC A/D 12BIT 125MSPS DL EVAL BRD |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 2 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 125M |
| 數(shù)據(jù)接口： | 串行 |
| 輸入范圍： | 2 Vpp |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 900mW @ 125MSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD9627 |
| 已供物品： | 板，電源 |
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AD9627
Rev. B | Page 31 of 76
POWER DISSIPATION AND STANDBY MODE
As shown in Figure 63 through Figure 66, the power dissipated
by the AD9627 is proportional to its sample rate. In CMOS
output mode, the digital power dissipation is determined
primarily by the strength of the digital drivers and the load
on each output bit.
The maximum DRVDD current (IDRVDD) can be calculated as
IDRVDD = VDRVDD × CLOAD × fCLK × N
where N is the number of output bits (26, in the case of the
AD9627, with the fast detect output pins disabled).
This maximum current occurs when every output bit switches on
every clock cycle, that is, a full-scale square wave at the Nyquist
frequency of fCLK/2. In practice, the DRVDD current is
established by the average number of output bits switching,
which is determined by the sample rate and the characteristics
of the analog input signal.
Reducing the capacitive load presented to the output drivers can
minimize digital power consumption. The data in Figure 63 was
taken using the same operating conditions as those used for the
Typical Performance Characteristics, with a 5 pF load on each
output driver.
TOT
A
L
P
O
W
E
R
(W)
S
U
PP
L
Y
C
U
R
EN
T
(
A
)
SAMPLE RATE (MSPS)
0
0.1
0.2
0.3
0.4
0.5
IAVDD
IDVDD
0.25
0
0.50
0.75
1.00
1.25
0
255075
100
125
150
TOTAL POWER
06
57
1-
06
3
IDRVDD
Figure 63. AD9627-150 Power and Current vs. Sample Rate
TOT
A
L
P
O
W
E
R
(W)
S
UP
P
L
Y
CU
RRE
N
T
(
A)
SAMPLE RATE (MSPS)
0
0.1
0.2
0.3
0.4
0.5
IAVDD
IDVDD
IDRVDD
0.25
0
0.50
0.75
1.00
1.25
0
25
50
75
100
125
TOTAL POWER
06
57
1-
06
4
Figure 64. AD9627-125 Power and Current vs. Sample Rate
TOT
A
L
P
O
W
E
R
(W)
S
UP
P
L
Y
CU
RRE
N
T
(
A)
SAMPLE RATE (MSPS)
0
0.1
0.2
0.3
0.4
IAVDD
IDVDD
IDRVDD
0.25
0
0.50
0.75
1.00
025
50
75
100
TOTAL POWER
06
57
1-
06
5
Figure 65. AD9627-105 Power and Current vs. Sample Rate
TOT
A
L
P
O
W
E
R
(W)
S
UP
P
L
Y
CU
RRE
N
T
(
A)
SAMPLE RATE (MSPS)
0
0.1
0.2
0.3
IAVDD
IDVDD
IDRVDD
0.25
0
0.50
0.75
0
20406080
TOTAL POWER
06
57
1-
06
6
Figure 66. AD9627-80 Power and Current vs. Sample Rate
By asserting PDWN (either through the SPI port or by asserting
the PDWN pin high), the AD9627 is placed in power-down
mode. In this state, the ADC typically dissipates 2.5 mW.
During power-down, the output drivers are placed in a high
impedance state. Asserting the PDWN pin low returns the
AD9627 to its normal operating mode. Note that PDWN is
referenced to the digital output driver supply (DRVDD) and
should not exceed that supply voltage.
Low power dissipation in power-down mode is achieved by
shutting down the reference, reference buffer, biasing networks,
and clock. Internal capacitors are discharged when entering power-
down mode and then must be recharged when returning to normal
operation. As a result, wake-up time is related to the time spent
in power-down mode, and shorter power-down cycles result in
proportionally shorter wake-up times.
When using the SPI port interface, the user can place the ADC
in power-down mode or standby mode. Standby mode allows
the user to keep the internal reference circuitry powered when
faster wake-up times are required. See the Memory Map Register
Description section for more details.
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