參數(shù)資料
型號(hào)： AD7920
廠商： Analog Devices, Inc.
英文描述： 250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70
中文描述： 250 kSPS的，10-/12-Bit模數(shù)轉(zhuǎn)換器6引腳SC70
文件頁(yè)數(shù)： 5/20頁(yè)
文件大小： 1091K
代理商： AD7920
REV. B
AD7910/AD7920
–5–
CS
SCLK
SDATA
t
2
t
6
t
3
t
4
ZERO
t
7
DB10
t
5
t
8
t
CONVERT
t
QUIET
ZERO
ZERO
DB11
DB2
DB1
DB0
B
THREE-STATE
THREE-
STATE
Z
4 LEADING ZEROS
1
2
3
4
5
13
14
15
16
t
1
Figure 2. AD7920 Serial Interface Timing Diagram
CS
SCLK
t
2
t
CONVERT
B
1
2
3
4
5
13
14
15
16
C
t
8
t
QUIET
t
ACQ
12.5(1/f
SCLK
)
1/THROUGHPUT
Figure 3. Serial Interface Timing Example
TO OUTPUT
PIN
C
L
50pF
200 A
I
OH
200 A
I
OL
1.6V
Figure 1. Load Circuit for Digital Output Timing
Specifications
TIMING EXAMPLES
Figures 2 and 3 show some of the timing parameters from the
Timing Specifications table.
Timing Example 1
From Figure 3, having f
SCLK
= 5 MHz and a throughput rate of
250 kSPS gives a cycle time of t
2
+ 12.5(1/f
SCLK
) + t
ACQ
= 4
m
s.
With t
2
= 10 ns min, this leaves t
ACQ
to be 1.49
m
s. This 1.49
m
s
satisfies the requirement of 250 ns for t
ACQ
. From Figure 3, t
ACQ
comprises 2.5(1/f
SCLK
) + t
8
+ t
QUIET
, where t
8
= 36 ns max. This
allows a value of 954 ns for t
QUIET,
satisfying the minimum re-
quirement of 50 ns.
Timing Example 2
The AD7920 can also operate with slower clock frequencies.
From Figure 3, having f
SCLK
= 3.4 MHz and a throughput rate
of 150 kSPS gives a cycle time of t
2
+ 12.5(1/f
SCLK
) + t
ACQ
=
6.66
m
s. With t
2
= 10 ns min, this leaves t
ACQ
to be 2.97
m
s. This
2.97
m
s satisfies the requirement of 250 ns for t
ACQ
. From
Figure 3, t
ACQ
comprises 2.5(1/f
SCLK
) + t
8
+ t
QUIET
, t
8
= 36 ns
max. This allows a value of 2.19
m
s for t
QUIET
, satisfying the
minimum requirement of 50 ns. As in this example and with
other slower clock values, the signal may already be acquired
before the conversion is complete, but it is still necessary to leave
50 ns minimum t
QUIET
between conversions. In this example, the
signal should be fully acquired at approximately point C in
Figure 3.
相關(guān)PDF資料
PDF描述
AD7910ARM-REEL7 ECONOLINE: REC2.2-S_DRW(Z)/H* - 2.2W DIP Package- 1kVDC Isolation- Regulated Output- 4.5-9V, 9-18V, 18-36V, 36-72V Wide Input Range 2 : 1- UL94V-0 Package Material- Continuous Short Circiut Protection- Cost Effective- 100% Burned In- Efficiency to 84%
AD7920AKS-REEL 250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70
AD7920AKS-REEL7 250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70
AD7920BKS-REEL7 250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70
AD7920BRM 250 kSPS, 10-/12-Bit ADCs in 6-Lead SC70
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7920AKS-500RL7 制造商:Rochester Electronics LLC 功能描述:12-BIT 250KSPS,ADC SC70 PKG I.C. - Tape and Reel 制造商:Analog Devices 功能描述:12-BIT 250KSPS,ADC SC70 PKG I.C.
AD7920AKS-REEL 制造商:Analog Devices 功能描述:
AD7920AKS-REEL7 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述:
AD7920AKSZ-500RL7 功能描述:IC ADC 12BIT SRL 250KSPS SC70-6 RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:microPOWER™ 位數(shù):8 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:- 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-VQFN 裸露焊盤(pán)（4x4） 包裝:Digi-Reel® 輸入數(shù)目和類型:8 個(gè)單端，單極 產(chǎn)品目錄頁(yè)面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6
AD7920AKSZ-REEL7 功能描述:IC ADC 12BIT SRL 250KSPS SC70-6 RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 位數(shù):16 采樣率（每秒）:15 數(shù)據(jù)接口:MICROWIRE?，串行，SPI? 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:480µW 電壓電源:單電源 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:38-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:38-QFN（5x7） 包裝:帶卷 (TR) 輸入數(shù)目和類型:16 個(gè)單端，雙極；8 個(gè)差分，雙極 配用:DC1011A-C-ND - BOARD DELTA SIGMA ADC LTC2494
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