參數(shù)資料
型號： AD7865
廠商： Analog Devices, Inc.
英文描述： Simultaneous Sampling, Fast, 14-Bit ADC(四通道,同時采樣,高速,14位A/D轉(zhuǎn)換器)
中文描述： 同步采樣，快速，14位ADC（四通道，同時采樣，高速，14位的A / D轉(zhuǎn)換器）
文件頁數(shù)： 10/21頁
文件大小： 375K
代理商： AD7865
AD7865
–10–
Rev. PrC
PRELMNARY
DATA
TECHNCAL
V
IN1B
input can be left unconnected but if it is connected to
a potential then that potential must be AGND.
flowing into the analog input will depend on the analog
input range and the analog input voltage. The maximum
current flows when negative full-scale is applied.
AD7864-1
Figure 3 shows the analog input section of the AD7865-1.
Each input can be configured for ±5 V or ±10 V opera-
tion on the AD7865-1. For ±5 V operation, the V
INXA
and
V
INXB
inputs are tied together and the input voltage is
applied to both. For ±10V operation, the V
input is
tied to AGND and the input voltage is applied to the V
INXA
input. The V
INXA
and V
INXB
inputs are symmetrical and fully
interchangeable. Thus for ease of PCB layout on the ±10
V range, the input voltage may be applied to the V
INXB
input while the V
INXA
input is tied to AGND.
AD7865-1
AD7865-1
V
IN1A
HOLD
TRACK/
TO ADC
REFERENCE
CIRCUITRY
CIRCUITRY
COMPARATOR
TO ADC
REFERENCE
TO INTERNAL
R4
R1
R2
6K
W
REFERENCE
REFERENCE
+2.5V
R3
GND
V
IN1B
VREF
Figure 3. AD7865-1 Analog Input Structure
For the AD7865-1, R1 = 6 k
, R2 = 24 k
,
R3 = 24 k
and R4 = 12 k
. The resistor input stage is followed by
the high input impedance stage of the track/hold ampli-
fier.
The designed code transitions take place midway between
successive 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
μ
V. For the ±10 V range, 1 LSB = 20 V/16384 =
1.22 mV. Output coding is 2s complement binary with 1
LSB = FS/16384. The ideal input/output transfer function
for the AD7865-1 is shown in Table I.
TABLE I. IDEAL INPUT/OUTPUT CODE TABLE FOR
THE AD7865-1
Digital Output
Code Transition
Analog Input
l
+FSR/2 – 3/2 LSB
2
+FSR/2 – 5/2 LSBs
+FSR/2 – 7/2 LSBs
011 . . . 110 to 011 . . . 111
011 . . . 101 to 011 . . . 110
011 . . . 100 to 011 . . . 101
AGND + 3/2 LSB
AGND + 1/2 LSB
AGND – 1/2 LSB
AGND – 3/2 LSB
000 . . . 001 to 000 . . . 010
000 . . . 000 to 000 . . . 001
111 . . . 111 to 000 . . . 000
111 . . . 110 to 111 . . . 111
–FSR/2 + 5/2 LSBs
–FSR/2 + 3/2 LSBs
–FSR/2 + 1/2 LSB
100 . . . 010 to 100 . . . 011
100 . . . 001 to 100 . . . 010
100 . . . 000 to 100 . . . 001
NOTES
1
FSR 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.
2
1 LSB = FSR/16384 = 1.22 mV (±10 V - AD7865-1) and 610.4
μ
V (±5 V -
AD7865-3
Figure 4 shows the analog input section of the AD7865-3.
The analog input range is ±2.5 V on the V
input. The
AD7865-3
V
IN1A
HOLD
TRACK/
CIRCUITRY
COMPARATOR
TO ADC
REFERENCE
TO INTERNAL
R1
R2
6K
W
REFERENCE
V
IN1B
+2.5V
VREF
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