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| 型號： | AD9640ABCPZ-80 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 24/52頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 14BIT 80MSPS 64LFCSP |
| 設(shè)計資源： | Interfacing ADL5534 to AD9640 High Speed ADC (CN0049) |
| 標(biāo)準包裝： | 1 |
| 位數(shù)： | 14 |
| 采樣率（每秒）： | 80M |
| 數(shù)據(jù)接口： | 串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 2 |
| 功率耗散（最大）： | 492mW |
| 電壓電源： | 模擬和數(shù)字 |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 64-VFQFN 裸露焊盤，CSP |
| 供應(yīng)商設(shè)備封裝： | 64-LFCSP-VQ（9x9） |
| 包裝： | 托盤 |
| 輸入數(shù)目和類型： | 4 個單端，單極；2 個差分，單極 |
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AD9640
Rev. B | Page 30 of 52
POWER DISSIPATION AND STANDBY MODE
As shown in Figure 63, the power dissipated by the AD9640
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 (30 in the case of the AD9640
with the FD bits 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 with the same operating conditions as the Typical
Performance Characteristics, with a 5 pF load on each output
driver.
0
150
125
1.25
0.75
1.0
0
0
654
7-
0
76
ENCODE FREQUENCY (MHz)
T
O
TA
L
P
O
WE
R
(
W
)
S
UP
P
L
Y
C
URRE
N
T
(
A)
0.5
0.25
0.5
0.4
0.3
0.2
0.1
0
25
50
75
100
IAVDD
TOTAL POWER
IDRVDD
IDVDD
Figure 63. AD9640-150 Power and Current vs. Clock Frequency
0
125
1.25
0.75
1.0
0
0
654
7-
0
75
ENCODE FREQUENCY (MHz)
T
O
TA
L
P
O
WE
R
(
W
)
S
UP
P
L
Y
CU
RRE
N
T
(
A)
0.5
0.25
0.5
0.4
0.3
0.2
0.1
0
25
50
75
100
IAVDD
TOTAL POWER
IDVDD
IDRVDD
Figure 64. AD9640-125 Power and Current vs. Clock Frequency
0
1
0
ENCODE FREQUENCY (MHz)
TOT
A
L
P
O
W
E
R
(W
)
0.75
0.25
0.5
25
50
75
100
06
54
7-
0
74
S
UP
P
L
Y
CURR
E
NT
(
A)
0.4
0.3
0.2
0.1
0
IAVDD
TOTAL POWER
IDRVDD
IDVDD
Figure 65. AD9640-105 Power and Current vs. Clock Frequency
08
0.75
0
0
654
7-
0
73
ENCODE FREQUENCY (MHz)
T
O
TA
L
P
O
WE
R
(
W
)
S
UP
P
L
Y
C
URRE
N
T
(
A)
0
0.5
0.25
0.3
0.2
0.1
0
20
40
60
IAVDD
TOTAL POWER
IDRVDD
IDVDD
Figure 66. AD9640-80 Power and Current vs. Clock Frequency
By asserting PDWN (either through the SPI port or by asserting
the PDWN pin high), the AD9640 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
AD9640 to its normal operational mode. Note that PDWN is
referenced to the digital supplies (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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD9640ABCPZRL7-105 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 14Bit 105Msps Dual 1.8V PB Free ADC RoHS:否 制造商:Analog Devices 通道數(shù)量: 結(jié)構(gòu): 轉(zhuǎn)換速率: 分辨率: 輸入類型: 信噪比: 接口類型: 工作電源電壓: 最大工作溫度: 安裝風(fēng)格: 封裝 / 箱體: |
| AD9640ABCPZRL7-125 | 功能描述:14 Bit Analog to Digital Converter 2 Input 2 Pipelined 64-LFCSP-VQ (9x9) 制造商:analog devices inc. 系列:- 包裝:帶卷（TR） 零件狀態(tài):在售 位數(shù):14 采樣率（每秒）:125M 輸入數(shù):2 輸入類型:差分，單端 數(shù)據(jù)接口:并聯(lián) 配置:S/H-ADC 無線電 - S/H:ADC:1:1 A/D 轉(zhuǎn)換器數(shù):2 架構(gòu):管線 參考類型:外部， 內(nèi)部 電壓 - 電源，模擬:1.7 V ~ 1.9 V 電壓 - 電源，數(shù)字:1.7 V ~ 1.9 V 特性:同步采樣 工作溫度:-40°C ~ 85°C 封裝/外殼:64-VFQFN 裸露焊盤，CSP 供應(yīng)商器件封裝:64-LFCSP-VQ（9x9） 標(biāo)準包裝:750 |
| AD9640ABCPZRL7-80 | 制造商:AD 制造商全稱:Analog Devices 功能描述:14-Bit, 80/105/125/150 MSPS, 1.8 V Dual Analog-to-Digital Converter |
| AD9640BCPZ-105 | 制造商:Analog Devices 功能描述:ADC Dual Pipelined 105Msps 14-bit Parallel 64-Pin LFCSP EP 制造商:Analog Devices 功能描述:IC ADC 14BIT 105MSPS LFCSP-64 |
| AD9640BCPZ-125 | 制造商:Analog Devices 功能描述:IC ADC 14BIT 125MSPS LFCSP-64 制造商:Analog Devices 功能描述:IC, ADC, 14BIT, 125MSPS, LFCSP-64, Resolution (Bits):14bit, Sampling Rate:150MSP |
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