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| 型號： | EVAL-AD976ACB |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 5/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD976A |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 200k |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 輸入范圍： | ±10 V |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 100mW @ 200kSPS |
| 工作溫度： | -40°C ~ 85°C |
| 已用 IC / 零件： | AD976A |
| 已供物品： | 板，CD |
| 相關(guān)產(chǎn)品： | AD976ACRSZ-ND - IC ADC 16BIT 200KSPS 28SSOP AD976ACRZ-ND - IC ADC 16BIT 200KSPS 28SOIC AD976CRZ-ND - IC ADC 16BIT 100KSPS 28SOIC AD976CRSZ-ND - IC ADC 16BIT 100KSPS 28SSOP AD976CNZ-ND - IC ADC 16BIT 100KSPS 28DIP AD976BRSZ-ND - IC ADC 16BIT 100KSPS 28SSOP AD976BNZ-ND - IC ADC 16BIT 100KSPS 28-DIP AD976ACNZ-ND - IC ADC 16BIT 200KSPS 28DIP AD976AARSZ-ND - IC ADC 16BIT 200KSPS 28SSOP AD976ARZRL-ND - IC ADC 16BIT 100KSPS 28SOIC 更多... |
AD976/AD976A
–13–
REV. C
DC CODE UNCERTAINTY
Ideally, a fixed dc input should result in the same output code
for repetitive conversions; however, as a consequence of un-
avoidable circuit noise within the wideband circuits of the ADC,
a range of output codes may occur for a given input voltage.
Thus, when a dc signal is applied to the AD976/AD976A input,
and 10,000 conversions are recorded, the result will be a distri-
bution of codes as shown in Figure 19. This histogram shows a
bell-shaped curve consistent with the Gaussian nature of ther-
mal noise. The histogram is approximately seven codes wide.
The standard deviation of this Gaussian distribution results in a
code transition noise of 1 LSB rms.
4000
3500
0
–3
2000
1500
1000
500
3000
2500
–2
–1
0
1
2
3
4
Figure 19. Histogram of 10,000 Conversions of a DC Input
MICROPROCESSOR INTERFACING
The AD976/AD976A is ideally suited for traditional dc mea-
surement applications supporting a microprocessor and ac signal
processing applications interfacing to a digital signal processor.
The AD976/AD976A is designed to interface with a 16-bit data
bus and provides all output data bits in a single read cycle. A
variety of external buffers can be used with the AD976/AD976A
to prevent bus noise from coupling into the ADC. The following
sections illustrate the use of the AD976/AD976A with the
MC68000 and 8051 microcontrollers and the TMS320C25 and
ADSP-2111 signal processors.
MC68000 Interface
Figure 20 shows a general interface diagram for the MC68000
16-bit microprocessor to the AD976/AD976A. In Figure 20,
conversion is initiated by bringing CSA low (i.e., writing to the
appropriate address). This allows the processor to maintain
control over the complete conversion process.
ADDRESS BUS
*ADDITIONAL PINS OMITTED FOR CLARITY
DATA BUS
DB15
DB0
BUSY
AD976/
AD976A
R/
C
BUS
74HC374
OE
Q15
Q0
D0
D15
CLK
EN
ADDR
DECODE
A0
A15
D15
D0
68000
R/W
AS
Figure 20. AD976/AD976A to 68000 Interface
250
0
150
100
200
50
NUMBER
OF
UNITS
0
0.2
0.3
0.4
0.6
0.7
0.8
1.0
1.1
1.2
1.4
1.5
1.6
1.8
1.9
2.0
2.2
2.3
2.4
2.6
2.7
2.8
3.0
3.1
3.2
POSITIVE DNL DISTRIBUTION – LSB
Figure 17. Typical Position DNL Distribution (1516 Units)
140
0
80
20
120
100
NUMBER
OF
UNITS
–1.2
NEGATIVE DNL DISTRIBUTION – LSB
60
40
–1.2
–1.1
–1
–0.9
–0.8
–0.7
–0.6
–0.5
–0.4
–0.3
–0.2
–0.1
0
Figure 18. Typical Negative DNL Distribution (1516 Units)
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| EVAL-AD976CB | 功能描述:BOARD EVAL FOR AD976 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD977ACB | 功能描述:BOARD EVAL FOR AD977A RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
| EVAL-AD977CB | 功能描述:BOARD EVAL FOR AD977 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - 模數(shù)轉(zhuǎn)換器 (ADC) 系列:- 產(chǎn)品培訓(xùn)模塊:Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- ADC 的數(shù)量:1 位數(shù):12 采樣率（每秒）:94.4k 數(shù)據(jù)接口:USB 輸入范圍:±VREF/2 在以下條件下的電源（標(biāo)準(zhǔn)）:- 工作溫度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，軟件 |
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| EVAL-AD9831EB | 制造商:Analog Devices 功能描述: |
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