參數(shù)資料
型號(hào)： AD1671JP
廠商： ANALOG DEVICES INC
元件分類： ADC
英文描述： Complete 12-Bit 1.25 MSPS Monolithic A/D Converter
中文描述： 1-CH 12-BIT FLASH METHOD ADC, PARALLEL ACCESS, PQCC28
封裝： PLASTIC, LCC-28
文件頁(yè)數(shù)： 11/16頁(yè)
文件大小： 394K
代理商： AD1671JP
AD1671
REV. B
–11–
Table III. Output Data Format
Input
Range
Analog
Input
l
Digital
Output
Coding
OTR
2
0 V to +2.5 V
Straight Binary
≤
–0.0003 V
0 V
+2.5 V
≥
+2.5003 V
0000 0000 0000
0000 0000 0000
1111 1111 1111
1111 1111 1111
1
0
0
1
0 V to +5 V
Straight Binary
≤
–0.0006 V
0 V
+5 V
≥
+5.0006 V
0000 0000 0000
0000 0000 0000
1111 1111 1111
1111 1111 1111
1
0
0
1
–2.5 V to +2.5 V
Offset Binary
≤
–2.5006 V
–2.5 V
+2.5 V
≥
+2.4994 V
0000 0000 0000
0000 0000 0000
1111 1111 1111
1111 1111 1111
1
0
0
1
–5 V to +5 V
Offset Binary
≤
–5.0012 V
–5 V
+5 V
≥
+4.9988 V
0000 0000 0000
0000 0000 0000
1111 1111 1111
1111 1111 1111
1
0
0
1
–2.5 V to +2.5 V
Twos Complement
(Using
MSB
)
≤
–2.5006 V
–2.5 V
+2.5 V
≥
+2.4994 V
1000 0000 0000
1000 0000 0000
0111 1111 1111
0111 1111 1111
1
0
0
1
–5 V to +5 V
Twos Complement
(Using
MSB
)
≤
–5.0012 V
–5 V
+5 V
≥
+4.9988 V
1000 0000 0000
1000 0000 0000
0111 1111 1111
0111 1111 1111
1
0
0
1
NOTES
1
Voltages listed are with offset and gain errors adjusted to zero.
2
Typical performance.
OUTPUT DATA FORMAT
The AD1671 provides both MSB and
MSB
outputs, delivering
data in positive true straight binary for unipolar input ranges
and positive true offset binary or twos complement for bipolar
input ranges. Straight binary coding is used for systems that ac-
cept positive-only signals. If straight binary coding is used with
bipolar input signals, a 0 V input would result in a binary output
of 2048. The application software would have to subtract 2048
to determine the true input voltage. Host registers typically per-
form math on signed integers and assume data is in that format.
Twos complement format minimizes software overhead which is
especially important in high speed data transfers, such as a
DMA operation. The CPU is not bogged down performing data
conversion steps, hence the total system throughput is increased.
OPTIONAL EXTERNAL REFERENCE
The AD1671 includes an onboard +2.5 V reference. The refer-
ence input pin (REF IN) can be connected to reference output
pin (REF OUT) or a standard external +2.5 V reference can be
selected to meet specific system requirements. Fast switching in-
put dependent currents are modulated at the reference input.
The reference input voltage can be held with the use of a capaci-
tor. To prevent the AD1671’s onboard reference from oscil-
lating when not connected to REF IN, REF OUT must be
connected to +5 V. It is possible to connect REF OUT to +5 V
due to its output circuit implementation which shuts down the
reference.
I
LOGIC
VS. CONVERSION RATE
Figure 15 is the typical logic supply current vs. conversion rate
for various capacitor loads on the digital outputs.
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
1M
CONVERSION RATE – Hz
m
1k
10k
100k
CL = 50pF
CL = 30pF
CL = 0pF
Figure 15. I
LOGIC
vs. Conversion Rate for Various
Capacitive Loads on the Digital Outputs
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