參數資料
型號: AD9627ABCPZ-125
廠商: Analog Devices Inc
文件頁數: 21/76頁
文件大?。?/td> 0K
描述: IC ADC 12BIT 1255MSPS 64LFCSP
標準包裝: 1
位數: 12
采樣率(每秒): 125M
數據接口: 串行,SPI?
轉換器數目: 2
功率耗散(最大): 800mW
電壓電源: 模擬和數字
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
供應商設備封裝: 64-LFCSP-VQ(9x9)
包裝: 托盤
輸入數目和類型: 4 個單端,單極;2 個差分,單極
AD9627
Rev. B | Page 28 of 76
VOLTAGE REFERENCE
A stable and accurate voltage reference is built into the AD9627.
The input range can be adjusted by varying the reference voltage
applied to the AD9627, 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 detects the potential at the
SENSE pin and configures the reference into four possible
modes, which are summarized in Table 14. 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
SELECT
LOGIC
0.1F
1.0F
VIN–A/VIN–B
VIN+A/VIN+B
ADC
CORE
0
65
71
-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
SELECT
LOGIC
VIN–A/VIN–B
VIN+A/VIN+B
ADC
CORE
VREF
SENSE
0.1F
1.0F
R2
R1
0
65
71
-0
52
Figure 52. Programmable Reference Configuration
If the internal reference of the AD9627 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
65
71
-05
3
Figure 53. VREF Accuracy vs. Load
Table 14. 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
0.5
2 × VREF
Internal Fixed Reference
AGND to 0.2 V
1.0
2.0
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