參數(shù)資料
型號: AD9627ABCPZ11-105
廠商: Analog Devices Inc
文件頁數(shù): 18/72頁
文件大?。?/td> 0K
描述: IC ADC 11BIT 105MSPS 64LFCSP
標(biāo)準(zhǔn)包裝: 1
位數(shù): 11
采樣率(每秒): 105M
數(shù)據(jù)接口: 串行,SPI?
轉(zhuǎn)換器數(shù)目: 2
功率耗散(最大): 650mW
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(gè)單端,單極;2 個(gè)差分,單極
AD9627-11
Rev. B | Page 25 of 72
VOLTAGE REFERENCE
A stable and accurate voltage reference is built into the
AD9627-11. The input range can be adjusted by varying the
reference voltage applied to the AD9627-11, using either the
internal reference or an externally applied reference voltage.
The input span of the ADC tracks reference voltage changes
linearly. The various reference modes are summarized in the
sections that follow. The Reference Decoupling section describes
the best practices PCB layout of the reference.
Internal Reference Connection
A comparator within the AD9627-11 detects the potential at the
SENSE pin and configures the reference into four possible
modes, which are summarized in Table 11. If SENSE is grounded,
the reference amplifier switch is connected to the internal
resistor divider (see Figure 51), setting VREF to 1.0 V. Connecting
the SENSE pin to VREF switches the reference amplifier output
to the SENSE pin, completing the loop and providing a 0.5 V
reference output.
VREF
SENSE
0.5V
AD9627-11
SELECT
LOGIC
0.1F
1.0F
VIN–A/VIN–B
VIN+A/VIN+B
ADC
CORE
0
70
54
-0
51
Figure 51. Internal Reference Configuration
If a resistor divider is connected external to the chip, as shown
in Figure 52, the switch again sets to the SENSE pin. This puts
the reference amplifier in a noninverting mode with the VREF
output defined as follows:
R1
R2
VREF
1
5
.
0
The input range of the ADC always equals twice the voltage at
the reference pin for either an internal or an external reference.
0.5V
AD9627-11
SELECT
LOGIC
VIN–A/VIN–B
VIN+A/VIN+B
ADC
CORE
VREF
SENSE
0.1F
1.0F
R2
R1
0
70
54
-0
52
Figure 52. Programmable Reference Configuration
If the internal reference of the AD9627-11 is used to drive multiple
converters to improve gain matching, the loading of the reference
by the other converters must be considered. Figure 53 shows
how the internal reference voltage is affected by loading.
0
–1.25
02.0
LOAD CURRENT (mA)
RE
F
E
RE
NCE
V
O
L
T
AG
E
RR
O
R
(
%
)
–0.25
–0.50
–0.75
–1.00
0.5
1.0
1.5
VREF = 0.5V
VREF = 1.0V
0
70
54
-05
3
Figure 53. VREF Accuracy vs. Load
Table 11. Reference Configuration Summary
Selected Mode
SENSE Voltage
Resulting VREF (V)
Resulting Differential Span (V p-p)
External Reference
AVDD
N/A
2 × external reference
Internal Fixed Reference
VREF
0.5
1.0
Programmable Reference
0.2 V to VREF
R1
R2
1
5
.
0
2 × VREF
Internal Fixed Reference
AGND to 0.2 V
1.0
2.0
OBSOLETE
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