參數(shù)資料
型號(hào)： AD9228ABCPZRL7-65
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 24/56頁(yè)
文件大?。?/td> 0K
描述： IC ADC 12BIT SPI/SRL 65M 48LFCSP
標(biāo)準(zhǔn)包裝： 750
位數(shù)： 12
采樣率（每秒）： 65M
數(shù)據(jù)接口： 串行，SPI?
轉(zhuǎn)換器數(shù)目： 4
功率耗散（最大）： 510mW
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： 48-VFQFN 裸露焊盤(pán)，CSP
供應(yīng)商設(shè)備封裝： 48-LFCSP-VQ（7x7）
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 8 個(gè)單端，單極；4 個(gè)差分，單極
AD9228
Data Sheet
Rev. E | Page 30 of 56
Internal Reference Operation
A comparator within the AD9228 detects the potential at the
SENSE pin and configures the reference. If SENSE is grounded,
the reference amplifier switch is connected to the internal
resistor divider (see Figure 64), setting VREF to 1 V.
The REFT and REFB pins establish the input span of the ADC
core from the reference configuration. The analog input full-
scale range of the ADC equals twice the voltage of the reference
pin for either an internal or an external reference configuration.
If the reference of the AD9228 is used to drive multiple
converters to improve gain matching, the loading of the refer-
ence by the other converters must be considered. Figure 66
depicts how the internal reference voltage is affected by loading.
1F
0.1F
VREF
SENSE
0.5V
REFT
0.1F
2.2F
0.1F
REFB
SELECT
LOGIC
ADC
CORE
+
05
72
7-
01
0
VIN – x
VIN + x
Figure 64. Internal Reference Configuration
1F
0.1F
VREF
SENSE
AVDD
0.5V
REFT
0.1F
2.2F
0.1F
REFB
SELECT
LOGIC
ADC
CORE
+
05
72
7-
04
6
VIN – x
VIN + x
Figure 65. External Reference Operation
External Reference Operation
The use of an external reference may be necessary to enhance
the gain accuracy of the ADC or to improve thermal drift
characteristics. Figure 67 shows the typical drift characteristics
of the internal reference in 1 V mode.
When the SENSE pin is tied to AVDD, the internal reference is
disabled, allowing the use of an external reference. The external
reference is loaded with an equivalent 6 kΩ load. An internal
reference buffer generates the positive and negative full-scale
references, REFT and REFB, for the ADC core. Therefore, the
external reference must be limited to a nominal 1.0 V.
01.0
0.5
2.0
1.5
3.0
2.5
3.5
V
RE
F
E
RRO
R
(
%
)
CURRENT LOAD (mA)
057
27
-08
3
–30
–5
–10
–15
–20
–25
5
0
Figure 66. VREF Accuracy vs. Load
0.02
–0.18
–40
80
60
40
20
0
–20
TEMPERATURE (°C)
V
REF
E
R
RO
R
(
%
)
0
–0.02
–0.04
–0.06
–0.08
–0.10
–0.12
–0.14
–0.16
05
72
7-
0
84
Figure 67. Typical VREF Drift
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