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參數(shù)資料
型號(hào): AD7891YP-1
廠商: ANALOG DEVICES INC
元件分類: ADC
英文描述: CAT5E PATCH CORD 6 FOOT BEIGE
中文描述: 8-CH 12-BIT PROPRIETARY METHOD ADC, SERIAL/PARALLEL ACCESS, PQCC44
封裝: PLASTIC, MO-047AC, LCC-44
文件頁(yè)數(shù): 13/20頁(yè)
文件大小: 173K
代理商: AD7891YP-1
AD7891
–13–
REV. A
Table I. Ideal Code Transition Table for the AD7891-1,
6
10 V and
6
5 V Ranges and the AD7891-2,
6
2.5 V Range
Digital Output Code Transition
1
Twos Complement
Analog Input
Input Voltage
Straight Binary
+FSR
2
/2 – 3/2 LSBs
3
+FSR/2 – 5/2 LSBs
+FSR/2 – 7/2 LSBs
(9.99268 V,
(9.98779 V,
(9.99145 V,
4.99634 V
4.99390 V
4.99146 V
or
or
or
2.49817 V)
4
2.49695 V)
2.49573 V)
011...110 to 011...111
011...101 to 011...110
011...100 to 011...101
111...110 to 111...111
111...101 to 111...110
111...100 to 111...101
AGND + 3/2 LSBs
AGND + 1/2 LSB
AGND – 1/2 LSB
AGND – 3/2 LSBs
(7.3242 mV,
(2.4414 mV,
(–2.4414 mV, –1.2207 mV or
(–7.3242 mV, –3.6621 mV or
3.6621 mV
1.2207 mV
or
or
1.8310 mV)
0.6103 mV)
–0.6103 mV)
–1.8310 mV)
000...001 to 000...010
000...000 to 000...001
111...111 to 000...000
111...110 to 111...111
100...001 to 100...010
100...000 to 100...001
011...111 to 100...000
011...110 to 011...111
–FSR/2 + 5/2 LSBs
–FSR/2 + 3/2 LSBs
–FSR/2 + 1/2 LSB
(–9.98779 V, –4.99390 V
(–9.99268 V, –4.99634 V
(–9.99756 V, –4.99878 V
or
or
or
–2.49695 V)
–2.49817 V)
–2.49939 V)
100...010 to 100...011
100...001 to 100...010
100...000 to 100...001
000...010 to 000...011
000...001 to 000...010
000...000 to 000...001
NOTES
1
Output Code format is determined by the FORMAT bit in the control register
2
FSR is full-scale range and is 20 V for the
±
10 V range, 10 V for the
±
5 V range and 5 V for the
±
2.5 V range, with REFIN = +2.5 V .
3
1 LSB = FSR/4096 = 4.88 mV (
±
10 V range), 2.44 mV (
±
5 V range) and 1.22 mV (
±
2.5 V range), with REF IN = +2.5 V.
4
±
10 V range,
±
5 V range or
±
2.5 V range.
Table II. Ideal Code Transition Table for the AD7891-2, 0 V to +5 V and 0 V to +2.5 V Ranges
Digital Output Code Transition
1
Twos Complement
Analog Input
+FSR
2
– 3/2 LSBs
3
+FSR – 5/2 LSBs
+FSR – 7/2 LSBs
Input Voltage
Straight Binary
(4.99817 V
(4.99695 V
(4.99573 V
or 2.49908 V)
4
or 2.49847 V)
or 2.49786 V)
011...110 to 011...111
011...101 to 011...110
011...100 to 011...101
111...110 to 111...111
111...101 to 111...110
111...100 to 111...101
AGND + 5/2 LSBs
AGND + 3/2 LSBs
AGND + 1/2 LSB
(3.0518 mV
(1.83105 mV or 0.9155 mV)
(0.6103 mV
or 0.3052 mV)
or 1.52588 mV)
100...010 to 000...011
100...001 to 000...010
100...000 to 000...001
000...010 to 000...011
000...001 to 000...010
000...000 to 000...001
NOTES
1
Output Code format is determined by the FORMAT bit in the control register
2
FSR is full-scale range and is 5 V for the 0 to 5 V range and 2.5 V for the 0 to 2.5 V range with REF IN = +2.5 V.
3
1 LSB = FS/4096 = 1.22 mV (0 to 5 V range) or 610
μ
V (0 to 2.5 V range), with REF IN = 2.5 V.
4
0 V to +5 V range or 0 V to + 2.5 V range.
Transfer Function of the AD7891-1 and AD7891-2
The transfer function of the AD7891-1 and AD7891-2 can be
expressed as follows:
Input Voltage = (M
×
REFIN
×
D/4096) + (N
×
REFIN)
D is the output data from the AD7891 and is in the range 0 to
4095 for straight binary encoding and from –2048 to 2047 for
twos complement encoding. Values for M depend upon the
input voltage range. Values for N depend upon the input volt-
age range and the output data format. These values are given in
Table III. REFIN is the reference voltage applied to the AD7891.
Table III. Transfer Function M and N Values
Output Data Format
Range
M
N
AD7891-1
±
10 V
±
10 V
±
5 V
±
5 V
AD7891-2
0 V to +5 V
0 V to +5 V
0 V to +2.5 V
0 V to +2.5 V
±
2.5 V
±
2.5 V
Straight Binary
Twos Complement
Straight Binary
Twos Complement
8
8
4
4
–4
0
–2
0
Straight Binary
Twos Complement
Straight Binary
Twos Complement
Straight Binary
Twos Complement
2
2
1
1
2
2
0
1
0
0.5
–1
0
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7891YP-1REEL 制造商:Analog Devices 功能描述:ADC Single 454.5ksps 12-bit Parallel/Serial 44-Pin PLCC T/R 制造商:Analog Devices 功能描述:ADC SGL 454.5KSPS 12-BIT PARALLEL/SERL 44PLCC - Tape and Reel
AD7891YPZ-1 功能描述:IC DAS 12BIT 8CH 44-PLCC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)(DAS) 分辨率(位):16 b 采樣率(每秒):21.94k 數(shù)據(jù)接口:MICROWIRE?,QSPI?,串行,SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP(6x6) 包裝:托盤(pán)
AD7891YPZ-1REEL 功能描述:IC DAS 12BIT 8CH 44-PLCC RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)(DAS) 分辨率(位):16 b 采樣率(每秒):21.94k 數(shù)據(jù)接口:MICROWIRE?,QSPI?,串行,SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP(6x6) 包裝:托盤(pán)
AD7891YS1 制造商:AD 功能描述:New
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