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參數資料
| 型號： | AD7863ARS-3 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | ADC |
| 英文描述： | Simultaneous Sampling Dual 175 kSPS 14-Bit ADC |
| 中文描述： | 4-CH 14-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDSO28 |
| 封裝： | MO-150AH, SSOP-28 |
| 文件頁數： | 10/18頁 |
| 文件大小： | 207K |
| 代理商： | AD7863ARS-3 |
AD7863
–
10
–
REV. A
Gain error can be adjusted at either the first code transition (ADC
negative full scale) or the last code transition (ADC positive full
scale). The trim procedures for both cases are as follows:
Positive Full-Scale Adjust (-10 Version)
Apply a voltage of +9.9927 V (FS/2
–
1 LSBs) at V
1
. Adjust R2
until the ADC output code flickers between 01 1111 1111 1110
and 01 1111 1111 1111.
Negative Full-Scale Adjust (-10 Version)
Apply a voltage of
–
9.9976 V (
–
FS + 1 LSB) at V
1
and adjust
R2 until the ADC output code flickers between 10 0000 0000
0000 and 10 0000 0000 0001.
An alternative scheme for adjusting full-scale error in systems
that use an external reference is to adjust the voltage at the V
REF
pin until the full-scale error for any of the channels is adjusted
out. The good full-scale matching of the channels will ensure
small full-scale errors on the other channels.
TIMING AND CONTROL
Figure 5a shows the timing and control sequence required to
obtain optimum performance (Mode 1) from the AD7863. In
the sequence shown, a conversion is initiated on the falling edge
of
CONVST
. This places both track/holds into hold simulta-
neously and new data from this conversion is available in the
output register of the AD7863 5.2
μ
s later. The BUSY signal
indicates the end of conversion and at this time the conversion
results for both channels are available to be read. A second
conversion is then initiated. If the multiplexer select A0 is low,
the first and second read pulses after the first conversion ac-
cesses the result from Channel A (V
A1
and V
A2
respectively).
The third and fourth read pulses, after the second conversion
and A0 high, accesses the result from Channel B (V
B1
and V
B2
respectively). A0
’
s state can be changed any time after the
CONVST
goes high, i.e., track/holds into hold and 500 ns prior
to the next falling edge of
CONVST
. Note that A0 should not
be changed during conversion if the nonselected channels have
negative voltages applied to them which are outside the input
range of the AD7863, as this will affect the conversion in
progress. Data is read from the part via a 14-bit parallel data bus
with standard
CS
and
RD
signal, i.e., the read operation con-
sists of a negative going pulse on the
CS
pin combined with two
negative going pulses on the
RD
pin (while the
CS
is low),
accessing the two 14-bit results. Once the read operation has
taken place, a further 400 ns should be allowed before the next
falling edge of
CONVST
to optimize the settling of the track/
hold amplifier before the next conversion is initiated. The
achievable throughput rate for the part is 5.2
μ
s (conversion
time) plus 100 ns (read time) plus 0.4
μ
s (quiet time). This
results in a minimum throughput time of 5.7
μ
s (equivalent to a
throughput rate of 175 kHz).
Read Options
Apart from the Read Operation described above and displayed
in Figure 5a, other
CS
and
RD
combinations can result in dif-
ferent channels/inputs being read in different combinations.
Suitable combinations are shown in Figures 5b through 5d.
CS
RD
DATA
V
A1
V
A2
Figure 5b. Read Option A (A0 Is Low)
CS
RD
DATA
V
A1
V
A2
V
A1
Figure 5c. Read Option B (A0 Is Low)
t
3
t
5
t
4
V
A1
V
A2
V
B1
V
B2
CONVST
BUSY
A0
CS
RD
DATA
t
1
t
7
t
2
t
6
t
CONV
= 5.2 s
t
ACQ
t
8
Figure 5a. Mode 1 Timing Operation Diagram for High Sampling Performance
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