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參數資料
型號: AD7883
廠商: Analog Devices, Inc.
英文描述: LC2MOS 12-Bit, 3.3 V Sampling ADC
中文描述: LC2MOS 12位,3.3伏采樣ADC
文件頁數: 6/12頁
文件大小: 349K
代理商: AD7883
AD7883
REV. 0
–6–
The AD7883 has one unipolar input range, 0 V to V
REF
. Figure
4 shows the analog input for this range. The designed code
transitions occur midway between successive integer LSB val-
ues (i.e., 1/2 LSB, 3/2 LSBs, 5/2 LSBs . . . FS –3/2 LSBs). The
output code is straight binary with
1 LSB = FS/4096 = 3.3 V/
4096 = 0.8 mV
when V
REF
= 3.3 V. The ideal input/output
transfer characteristic for the unipolar range is shown in Figure 6.
1LSB =
FS
4096
OUTPUT
CODE
0V
111...111
111...110
111...101
111...100
000...011
000...001
000...000
000...010
V
IN
INPUT VOLTAGE
1LSB
FS – 1LSB
+
Figure 6. Unipolar Transfer Characteristics
Figure 5 shows the AD7883’s
±
V
REF
bipolar analog input con-
figuration. Once again the designed code transitions occur mid-
way between successive integer LSB values. The output code is
straight binary with
1 LSB
= FS/4096 = 6.6 V/4096 = 1.6 mV.
The ideal bipolar input/output transfer characteristic is shown
in Figure 7.
A
A
A
AA
2
AA
AA
–FS
2
FS = 10V
1LSB =
FS
4096
OUTPUT
CODE
111...111
111...110
100...101
100...000
011...111
011...110
000...001
000...000
– 1LSB
0V
V
IN
INPUT VOLTAGE
–1LSB
+1LSB
Figure 7. Bipolar Transfer Characteristic
CLOCK INPUT
The AD7883 is specified to operate with a 2 MHz clock con-
nected to the CLKIN input pin. This pin may be driven directly
by CMOS buffers. The mark/space ratio on the clock can vary
from 40/60 to 60/40. As the clock frequency is slowed down, it
can result in slightly degraded accuracy performance. This is
due to leakage effects on the hold capacitor in the internal
track-and-hold amplifier. Figure 8 is a typical plot of accuracy
versus clock frequency for the ADC.
2.5
2.0
1.5
1.0
0.5
0.0
1.0
2.0
3.0
CLOCK FREQUENCY – MHz
N
Figure 8. Normalized Linearity Error vs. Clock Frequency
TRACK/HOLD AMPLIFIER
The charge balanced comparator used in the AD7883 for the
A/D conversion provides the user with an inherent track/hold
function. The track/hold amplifier acquires an input signal to
12-bit accuracy in less than 5
μ
s. The overall throughput time is
equal to the conversion time plus the track/hold amplifier acqui-
sition time. For a 2 MHz input clock, the throughput time is
20
μ
s.
The operation of the track/hold amplifier is essentially transpar-
ent to the user. The track/hold amplifier goes from its tracking
mode to its hold mode at the start of conversion, i.e., on the ris-
ing edge of
CONVST
as shown in Figure 1.
OFFSET AND FULL-SCALE ADJUSTMENT
In most Digital Signal Processing (DSP) applications, offset and
full-scale errors have little or no effect on system performance.
Offset error can always be eliminated in the analog domain by
ac coupling. Full-scale error effect is linear and does not cause
problems as long as the input signal is within the full dynamic
range of the ADC. Some applications will require that the input
signal range match the maximum possible dynamic range of the
ADC. In such applications, offset and full-scale error will have
to be adjusted to zero.
The following sections describe suggested offset and full-scale
adjustment techniques which rely on adjusting the inherent off-
set of the op amp driving the input to the ADC as well as tweak-
ing an additional external potentiometer as shown in Figure 9.
相關PDF資料
PDF描述
AD7883BN LC2MOS 12-Bit, 3.3 V Sampling ADC
AD7883BR LC2MOS 12-Bit, 3.3 V Sampling ADC
AD7884 LC2MOS 16-Bit, High Speed Sampling ADCs
AD7884AN LC2MOS 16-Bit, High Speed Sampling ADCs
AD7884AP LC2MOS 16-Bit, High Speed Sampling ADCs
相關代理商/技術參數
參數描述
AD7883BN 制造商:Analog Devices 功能描述:ADC Single SAR 50ksps 12-bit Parallel 24-Pin SOIC W 制造商:Rochester Electronics LLC 功能描述:12 BIT A/D CONVERTER IC - Bulk
AD7883BR 制造商:Analog Devices 功能描述:ADC Single SAR 50ksps 12-bit Parallel 24-Pin SOIC W 制造商:Analog Devices 功能描述:ADC SGL SAR 50KSPS 12-BIT PARALLEL 24SOIC W - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:12 BIT A/D CONVERTER IC - Bulk
AD7883BR-REEL 制造商:Analog Devices 功能描述:ADC Single SAR 50ksps 12-bit Parallel 24-Pin SOIC W T/R 制造商:Analog Devices 功能描述:ADC SGL SAR 50KSPS 12-BIT PARALLEL 24SOIC W - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:12 BIT A/D CONVERTER IC - Tape and Reel
AD7884AP 制造商:Analog Devices 功能描述:ADC Single 2-Step Flash 166ksps 16-bit Parallel 44-Pin PLCC 制造商:Rochester Electronics LLC 功能描述:16-BIT PARAL.SAMPL.ADC IC - Bulk
AD7884AP-REEL 制造商:Analog Devices 功能描述:ADC Single 2-Step Flash 166ksps 16-bit Parallel 44-Pin PLCC T/R 制造商:Rochester Electronics LLC 功能描述:16-BIT PARAL.SAMPL ADC IC - Tape and Reel
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