VINA TRACK/HOLD TO ADC REFERENCE CIRCUITRY TO INTERNAL COMPARATOR R4 R1 R2 6" />
參數(shù)資料
型號(hào)： AD7899BR-1REEL7
廠(chǎng)商： Analog Devices Inc
文件頁(yè)數(shù)： 16/16頁(yè)
文件大?。?/td> 0K
描述： IC ADC 14BIT 400KSPS 5V 28-SOIC
產(chǎn)品變化通告： Product Discontinuance 27/Oct/2011
標(biāo)準(zhǔn)包裝： 400
位數(shù)： 14
采樣率（每秒）： 400k
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 125mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 28-SOIC（0.295"，7.50mm 寬）
供應(yīng)商設(shè)備封裝： 28-SOIC W
包裝： 帶卷 (TR)
輸入數(shù)目和類(lèi)型： 1 個(gè)差分，雙極
配用： EVAL-AD7899CBZ-ND - BOARD EVAL FOR AD7899
REV. A
AD7899
–9–
AD7899-1
VINA
TRACK/HOLD
TO ADC
REFERENCE
CIRCUITRY
TO INTERNAL
COMPARATOR
R4
R1
R2
6k
2.5V
REFERENCE
R3
GND
VINB
VREF
Figure 2. AD7899-1 Analog Input Structure
For the AD7899-1, R1 = 4 k
, R2 = 16 k, R3 = 16 k and
R4 = 8 k
. The resistor input stage is followed by the high
input impedance stage of the track/hold amplifier.
The designed code transitions take place midway between suc-
cessive integer LSB values (i.e., 1/2 LSB, 3/2 LSBs, 5/2 LSBs
etc.) LSB size is given by the formula, 1 LSB = FSR/16384. For
the
±5 V range, 1 LSB = 10 V/16384 = 610.4 V. For the ±10 V
range, 1 LSB = 20 V/16384 = 1.22 mV. Output coding is
two’s complement binary with 1 LSB = FSR/16384. The ideal
input/output transfer function for the AD7899-1 is shown in
Table I.
Table I. Ideal Input/Output Code Table for the AD7899-1
Digital Output
Analog Input
1
Code Transition
+FSR/2 – 3/2 LSB
2
011 . . . 110 to 011 . . . 111
+FSR/2 – 5/2 LSB
011 . . . 101 to 011 . . . 110
+FSR/2 – 7/2 LSB
011 . . . 100 to 011 . . . 101
GND + 3/2 LSB
000 . . . 001 to 000 . . . 010
GND + 1/2 LSB
000 . . . 000 to 000 . . . 001
GND – 1/2 LSB
111 . . . 111 to 000 . . . 000
GND – 3/2 LSB
111 . . . 110 to 111 . . . 111
–FSR/2 + 5/2 LSB
100 . . . 010 to 100 . . . 011
–FSR/2 + 3/2 LSB
100 . . . 001 to 100 . . . 010
–FSR/2 + 1/2 LSB
100 . . . 000 to 100 . . . 001
NOTES
1FSR is full-scale range and is 20 V for the
±10 V range and 10 V for the ±5 V
range, with VREF = 2.5 V.
21 LSB = FSR/16384 = 1.22 mV (
±10 V – AD7899-1) and 610.4 V (±5 V –
AD7899-1) with VREF = 2.5 V.
AD7899-2
Figure 3 shows the analog input section of the AD7899-2. Each
input can be configured for 0 V to 5 V operation or 0 V to 2.5 V
operation. For 0 V to 5 V operation, the VINB input is tied to
GND and the input voltage is applied to the VINA input. For
0 V to 2.5 V operation, the VINA and VINB inputs are tied together
and the input voltage is applied to both. The VINA and VINB
inputs are symmetrical and fully interchangeable.
For the AD7899-2, R1 = 4 k
and R2 = 4 k. Once again, the
designed code transitions occur on successive integer LSB values.
Output coding is straight (natural) binary with 1 LSB = FSR/
16384 = 2.5 V/16384 = 0.153 mV, and 5 V/16384 = 0.305 mV,
for the 0 to 2.5 V and the 0 to 5 V options respectively. Table
II shows the ideal input and output transfer function for the
AD7899-2.
AD7899-2
VINA
TRACK/HOLD
TO ADC
REFERENCE
CIRCUITRY
TO INTERNAL
COMPARATOR
R1
6k
2.5V
REFERENCE
R2
VINB
VREF
Figure 3. AD7899-2 Analog Input Structure
Table II. Ideal Input/Output Code Table for the AD7899-2
Digital Output
Analog Input
1
Code Transition
+FSR – 3/2 LSB
2
111 . . . 110 to 111 . . . 111
+FSR – 5/2 LSB
111 . . . 101 to 111 . . . 110
+FSR – 7/2 LSB
111 . . . 100 to 111 . . . 101
GND + 5/2 LSB
000 . . . 010 to 000 . . . 011
GND + 3/2 LSB
000 . . . 001 to 000 . . . 010
GND + 1/2 LSB
000 . . . 000 to 000 . . . 001
NOTES
1FSR is Full-Scale Range and is 0 to 2.5 V and 0 to 5 V for AD7899-2 with V
REF
= 2.5 V.
21 LSB = FSR/16384 and is 0.153 mV (0 to 2.5 V) and 0.305 mV (0 to 5 V) for
AD7899-2 with VREF = 2.5 V.
相關(guān)PDF資料
PDF描述
AD7910ARMZ IC ADC 10BIT 250KSPS 8MSOP
AD7912ARMZ IC ADC 10BIT DUAL 2CH 8MSOP
AD7921ARMZ-REEL IC ADC 12BIT DUAL LP 8MSOP
AD7923WYRUZ-REEL7 IC ADC 12BIT 4CH W/SEQ 16TSSOP
AD7924BRU IC ADC 12BIT 4CH 1MSPS 16-TSSOP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AD7899BR-3 制造商:Rochester Electronics LLC 功能描述:14-BIT BIPOLAR INPUT SINGLE SUPPLY ADC - Bulk 制造商:Analog Devices 功能描述:
AD7899BR-3REEL 制造商:Analog Devices 功能描述:ADC SGL SAR 400KSPS 14BIT PARALLEL 28SOIC W - Tape and Reel
AD7899BR-3REEL7 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述:
AD7899BRZ-1 功能描述:IC ADC 14BIT 400KSPS 5V 28SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> 數(shù)據(jù)采集 - 模數(shù)轉(zhuǎn)換器 系列:- 其它有關(guān)文件:TSA1204 View All Specifications 標(biāo)準(zhǔn)包裝:1 系列:- 位數(shù):12 采樣率（每秒）:20M 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:2 功率耗散（最大）:155mW 電壓電源:模擬和數(shù)字 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:48-TQFP 供應(yīng)商設(shè)備封裝:48-TQFP（7x7） 包裝:Digi-Reel® 輸入數(shù)目和類(lèi)型:4 個(gè)單端，單極；2 個(gè)差分，單極 產(chǎn)品目錄頁(yè)面:1156 (CN2011-ZH PDF) 其它名稱(chēng):497-5435-6
AD7899BRZ-3 功能描述:IC ADC 14BIT 400KSPS 5V 28SOIC RoHS:是 類(lèi)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:1,000 系列:- 位數(shù):12 采樣率（每秒）:300k 數(shù)據(jù)接口:并聯(lián) 轉(zhuǎn)換器數(shù)目:1 功率耗散（最大）:75mW 電壓電源:單電源 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:24-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:24-SOIC 包裝:帶卷 (TR) 輸入數(shù)目和類(lèi)型:1 個(gè)單端，單極；1 個(gè)單端，雙極
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠(chǎng)商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*