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參數(shù)資料
| 型號： | DDC112UK |
| 英文描述： | Dual Current Input 20-Bit ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 雙路電流輸入20位模擬數(shù)字轉換器 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大?。?/td> | 210K |
| 代理商： | DDC112UK |
10
DDC112
CLK = 10MHz
CLK = 15MHz
SYMBOL
DESCRIPTION
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
t
1
t
2
t
3
t
4
Setup Time for Test Mode Enable
Setup Time for Test Mode Disable
Hold Time for Test Mode Enable
From Rising Edge of TEST to the Edge of CONV
while Test Mode Enabled
Rising Edge to Rising Edge of TEST
100
100
100
5.4
100
100
100
3.6
ns
ns
ns
μ
s
t
5
5.4
3.6
μ
s
A low-pass filter to reduce noise connects it to an opera-
tional amplifier configured as a buffer. This amplifier
should have a unity gain bandwidth greater than 4MHz,
low noise, and input/output common-mode ranges that
support V
REF
. Following the buffer are capacitors placed
close to the DDC112’s V
REF
pin. Even though the circuit in
Figure 6 might appear to be unstable due to the large output
capacitors, it works well for most operational amplifiers. It
is NOT recommended that series resistance be placed in the
output lead to improve stability since this can cause droop
in V
REF
which produces large offsets.
FIGURE 8. Timing Diagram of the Test Mode of the DDC112.
TABLE III. Timing for the DDC112 in the Test Mode.
DDC112 Frequency Response
The frequency response of the DDC112 is set by the front end
integrators and is that of a traditional continuous time integra-
tor, as shown in Figure 7. By adjusting T
INT
, the user can
change the 3dB bandwidth and the location of the notches in
the response. The frequency response of the
Σ
converter that
follows the front end integrator is of no consequence because
the converter samples a held signal from the integrators. That
is, the input to the
Σ
converter is always a DC signal. Since
the output of the front end integrators are sampled, aliasing can
occur. Whenever the frequency of the input signal exceeds
one-half of the sampling rate, the signal will “fold” back down
to lower frequencies.
Test Mode
When TEST is used, pins IN1 and IN2 are grounded and
“packets” of approximately 13pC charge are transferred to
the integration capacitors of both Input 1 and Input 2. This
fixed charge can be transferred to the integration capacitors
either once during an integration cycle or multiple times. In
the case where multiple packets are transferred during one
integration period, the 13pC charge is additive. This mode
can be used in both the continuous and non-continuous
mode timing. The timing diagrams for test mode are shown
in Figure 8. The top three lines in Figure 8 define the timing
when one packet of 13pC is sent to the integration capaci-
tors. The bottom three lines define the timing when multiple
packets are sent to the integration capacitors.
FIGURE 7. Frequency Response of the DDC112.
0
–10
–20
–30
–40
–50
0.1
T
INT
100
T
INT
1
T
INT
10
T
INT
Frequency
G
t
1
t
1
t
3
t
4
t
4
t
5
t
2
Integrate B
Action
CONV
TEST
Action
CONV
TEST
Integrate A
Test Mode Disabled
13pC into B
13pC into A
13pC into B
13pC into A
Test Mode Disabled
Test Mode Enabled
Integrate B
Integrate A
Integrate B
Integrate A
Test Mode Disabled
13pC into B
26pC into A
39pC into B
52pC into A
Test Mode Disabled
Test Mode Enabled
Integrate B
Integrate A
t
2
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| DDC112UK | 制造商:Texas Instruments 功能描述:DUAL CURRENT INPUT 20 BIT ANALOG/DIGITAL |
| DDC112UK | 制造商:Texas Instruments 功能描述:20BIT ADC DUAL SMD SOIC28 112 |
| DDC112UK/1K | 功能描述:模數(shù)轉換器 - ADC Dual Current Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| DDC112UK/1KG4 | 功能描述:模數(shù)轉換器 - ADC Dual Current Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| DDC112UKG4 | 功能描述:模數(shù)轉換器 - ADC Dual Current Input 20B ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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