參數(shù)資料
型號(hào)： AD7864ASZ-3
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 6/28頁(yè)
文件大小： 0K
描述： IC ADC 12BIT PAR 520K 4CH 44MQFP
標(biāo)準(zhǔn)包裝： 1
位數(shù)： 12
采樣率（每秒）： 520k
數(shù)據(jù)接口： 并聯(lián)
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 120mW
電壓電源： 模擬和數(shù)字
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 44-QFP
供應(yīng)商設(shè)備封裝： 44-MQFP（10x10）
包裝： 托盤
輸入數(shù)目和類型： 4 個(gè)差分，雙極
AD7864
Rev. D | Page 14 of 28
Table 6. Ideal Input/Output Code Table for the AD7864-2
Analog Input1
Digital Output Code Transition
+FSR 3/2 LSB2
111...110 to 111...111
+FSR 5/2 LSB
111...101 to 111...110
+FSR 7/2 LSB
111...100 to 111...101
AGND + 5/2 LSB
000...010 to 000...011
AGND + 3/2 LSB
000...001 to 000...010
AGND + 1/2 LSB
000...000 to 000...001
1 FSR is the full-scale range and is 0 V to 2.5 V and 0 V to 5 V for the AD7864-2
with VREF = 2.5 V.
2 1 LSB = FSR/4096 and is 0.61 mV (0 V to 2.5 V) and 1.22 mV (0 V to 5 V) for the
AD7864-2 with VREF = 2.5 V.
AD7864-3
Figure 6 shows the analog input section of the AD7864-3. The
analog input range is ±2.5 V on the VIN1A input. The VIN1B input
can be left unconnected, but if it is connected to a potential,
that potential must be AGND.
T/H
R2
AD7864-3
R1
2.5V
REFERENCE
TO ADC
REFERENCE
CIRCUITRY
TO INTERNAL
COMPARATOR
6k
VIN1B
VIN1A
VREF
01
34
1-
00
6
Figure 6. AD7864-3 Analog Input Structure
For the AD7864-3, R1 = 6 kΩ and R2 = 6 kΩ. As a result, drive
the VIN1A input from a low impedance source. The resistor input
stage is followed by the high input impedance stage of the track-
and-hold amplifier.
The designed code transitions take place midway between
successive integer least significant bit values (that is, 1/2 LSB,
3/2 LSB, 5/2 LSB, and so on). Least significant bit size is given by
the formula 1 LSB = FSR/4096. Output coding is twos comple-
ment binary with 1 LSB = FSR/4096 = 5 V/4096 = 1.22 mV. The
ideal input/ output transfer function for the AD7864-3 is shown
Table 7. Ideal Input/Output Code Table for the AD7864-3
Analog Input1
Digital Output Code Transition
+FSR/2 3/2 LSB2
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
AGND + 3/2 LSB
000...001 to 000...010
AGND + 1/2 LSB
000...000 to 000...001
AGND 1/2 LSB
111...111 to 000...000
AGND 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
1 FSR is the full-scale range and is 5 V, with VREF = 2.5 V.
2 1 LSB = FSR/4096 = 1.22 mV (±2.5 V AD7864-3) with VREF = 2.5 V.
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